US2238749A - Fan blade - Google Patents

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Publication number
US2238749A
US2238749A US253518A US25351839A US2238749A US 2238749 A US2238749 A US 2238749A US 253518 A US253518 A US 253518A US 25351839 A US25351839 A US 25351839A US 2238749 A US2238749 A US 2238749A
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Prior art keywords
blades
fan
members
blade
corrugations
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Expired - Lifetime
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US253518A
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James E Peltier
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CLARENCE B SWIFT
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CLARENCE B SWIFT
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Priority to US253518A priority Critical patent/US2238749A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/32Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38Blades
    • F04D29/384Blades characterised by form
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00Components
    • F05D2240/20Rotors
    • F05D2240/30Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/304Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the trailing edge of a rotor blade

Definitions

  • This invention relates to fans and more particularly to fan blades.
  • One of the objects of the present invention is to provide an improved fan which delivers more ically and does not materially set up in operation vibrations in the supporting structure.
  • Fig. 1 is a front view of a present invention.
  • Fig. 2 is a side view of the fan shown in Fig. 1, looking from the right-hand side thereof.
  • Fig. 8 is a sectional view taken in the direction of the arrows on the section plane passing through the line 3-3 of Fig. -1.
  • Pig. 4 is a sectional view. taken in the direction of the arrows on the section plane passing throughthelineH of Fig. 1.
  • Fig. 5 is a front view illustrating a modified construction oi a fan embodying the present invention.
  • the structure illustrated therein comprises two elongated members indicated generally by numerals I. and II, said members being arranged in crossed relation and secured together at their middle portions in any suitable'manner, such as by means of rivets l2, to form a boss or hub l3.
  • Reinforcing ribs l4 and I] are stamped in the members in such a way that each individual reinforcing rib is formed fully on one member and partly on the other member.
  • Such a construction increases the strength of the fan particularly at the roots of the individual blades where the bending moment is greatest, and provides for better interlocking of .members II and H. i 7
  • each of the two blades formed on the member It being designated by numeral I
  • each of the two blades formed on the member II is designated by numeral l'l. All of the blades are twisted around their longitudinal axes, as is best shown in Fig. 2, to produce the desired pitch angle, said angle, in the present instance, being equal for all four blades.
  • Each of the blades so formed has a leading edge Ito or Ila respectively, a trailing edge lib or "b respectively, and a tip or toe lie or "c respectively.
  • a central aperture II and a plurality of or roaring noises, the elimination. of which has proved to be extremely diflicultc In accordance with the present invention, means are provided eliminating said noises and producing a smoothly and quietly running fan or propeller.
  • the blades may be of diflerent widths and lengths.
  • the radii of the curvatures at the blade tips may be difl'erent.
  • corrugations of different kinds and sizes may be provided on adjacent blades.
  • Reinforcing ribs may be of different sizes thereby producing blades 01' different stiil'nesses and, consequently, ofldifferent vialso be noted that the uneven blades are arranged adjacent each other and, therefore, the rhythmic alibeats produced by the blade I!
  • FIG. 5 illustrates a modified structure constructed in accordance with the above disclosures.
  • the blades 25 are somewhat longer than the blades 26 and the' radii oi. curvature at their tips 250 are somewhat larger than at the tips 260.
  • corrugations ii of each of the blades 25, are flner than the single corrugation II of each of the shorter blades 26.
  • aeeavee 2 In a fan, a plurality of stamped sheet metal members arranged one across the other and securedtogether, a blade formed on each end of each of said members to provide an even plurality of blades, each of said blades having' a leading and a trailing edge, and corrugations on the trailing edges of only half of sald blades, the blades with corrugations and the blades without the same being arranged alternatively, thereby causing adjacent blades to set up in operation air waves of mutually interfering frequencies.
  • a tan two elongated stamped sheet metal members arranged crosswise and secured together at their middle portions; a blade formed on each end of each of said members to provide four radiating blades, each of said blades having a leading edge, a trailing edge and a tip, and stamped corrugations on the trailing edges of the two blades formed on one 01' said members, said corrugations serving to break up the rhythm of the sound waves produced by the blades.
  • a fan two elongated stamped sheet metal members arranged crosswise and secured together at their middle portions; a blade formed on each end of each of said members to provide four radiating blades, each of said blades having a being of different formation in order to set up in operation mutually interfering and deadening sound waves.

Description

April 15,1941. E. L R 2;238,749
FAN BLADE I Filed Jan. 30, 1939 2-5t BY (1%ENT9R M cM ATTORNEY.
Patented Apr. 15, 1941 UNITED STAT ES PATENTI' OFFICE James Poitier, Detroit, Mich., assignor to Clarence 8. Swift, doing business as Swift Manufacturing Company, Detroit, Mich.
Application January 30, 1939, Serial N0. 253,518 (Cl. 170-159) 4 Claims.
This invention relates to fans and more particularly to fan blades.
One of the objects of the present invention is to provide an improved fan which delivers more ically and does not materially set up in operation vibrations in the supporting structure.
It is an added object of the present invention to provide an improvedstructure of the foregoing character which is simple in construction, dependable in operation and is relatively inexpensive to manufacture.
Other objects of this invention will appear in the following description and appended claims.
reference being had to the accompanying drawing forming a part of this specification wherein like reference characters designate corresponding parts in the several views.
Fig. 1 is a front view of a present invention.
Fig. 2 is a side view of the fan shown in Fig. 1, looking from the right-hand side thereof.
Fig. 8 is a sectional view taken in the direction of the arrows on the section plane passing through the line 3-3 of Fig. -1.
Pig. 4 is a sectional view. taken in the direction of the arrows on the section plane passing throughthelineH of Fig. 1.
' Fig. 5 is a front view illustrating a modified construction oi a fan embodying the present invention. g
Before explaining in detail the present invention it is to be understood that the invention is not limited in its application to the details of construction and arrangement of parts illustrated in the accompanying drawin since the invention ever, that my invention is equally applicable to the fans having other numbers oi blades, as well as to different types of fans or propellers.
,. Referring to Figs. 1 to 4 inclusive, the structure illustrated therein comprises two elongated members indicated generally by numerals I. and II, said members being arranged in crossed relation and secured together at their middle portions in any suitable'manner, such as by means of rivets l2, to form a boss or hub l3. Reinforcing ribs l4 and I] are stamped in the members in such a way that each individual reinforcing rib is formed fully on one member and partly on the other member. Such a construction increases the strength of the fan particularly at the roots of the individual blades where the bending moment is greatest, and provides for better interlocking of .members II and H. i 7
fan embodying the On the ends of the members l0 and ii there are formed fan blades, each of the two blades formed on the member It being designated by numeral I, while each of the two blades formed on the member II is designated by numeral l'l. All of the blades are twisted around their longitudinal axes, as is best shown in Fig. 2, to produce the desired pitch angle, said angle, in the present instance, being equal for all four blades. Each of the blades so formed has a leading edge Ito or Ila respectively, a trailing edge lib or "b respectively, and a tip or toe lie or "c respectively. A central aperture II and a plurality of or roaring noises, the elimination. of which has proved to be extremely diflicultc In accordance with the present invention, means are provided eliminating said noises and producing a smoothly and quietly running fan or propeller.
0n the trailing edges lib of the blades 18 there are provided a plurality of irregularities, in the present instance, corrugations II formed on the blades, which irregularities make the blades II and H not quite identical in their shape. By virture of such a construction a much quieter fan is produced. It is my present theory that the invention. The constructions shown are fans of the four-blade type. It will be understood, howmore quiet operation 'of my improved fan results from the fact that the rhythmic a'ir waves produced by the blades ll and I! are difierentin pitch and character and, therefore, of adding together as is the case in identical blades of conventional fans, the waves produced by the blades of my improved fan' are of different pitch and character and, therefore, they interfere and break each other, producing irregular air motions which do not travel far. I
In accordance with the inventiompractically any means which produce unequal blades or blades 01 qiflerent shapes capable of producing unequal or interfering air vibrations, waves'or impulses may be utilized to produce the beneficial results contemplated by the present invention. For instance, the blades may be of diflerent widths and lengths. The radii of the curvatures at the blade tips may be difl'erent. corrugations of different kinds and sizes may be provided on adjacent blades. Reinforcing ribs may be of different sizes thereby producing blades 01' different stiil'nesses and, consequently, ofldifferent vialso be noted that the uneven blades are arranged adjacent each other and, therefore, the rhythmic alibeats produced by the blade I! are deadened by the beats produced by the blade II which follows in operation immediately after the blade i'l'. It is desirable to arrange blades in such a way that blades of identical character are disposedion the same diameter or on a line passing through the center of the tan hub in orde to produce balanced fans. Fig. 5 illustrates a modified structure constructed in accordance with the above disclosures. In saidstructure the blades 25 are somewhat longer than the blades 26 and the' radii oi. curvature at their tips 250 are somewhat larger than at the tips 260. corrugations ii of each of the blades 25, are flner than the single corrugation II of each of the shorter blades 26.
aeeavee 2. In a fan, a plurality of stamped sheet metal members arranged one across the other and securedtogether, a blade formed on each end of each of said members to provide an even plurality of blades, each of said blades having' a leading and a trailing edge, and corrugations on the trailing edges of only half of sald blades, the blades with corrugations and the blades without the same being arranged alternatively, thereby causing adjacent blades to set up in operation air waves of mutually interfering frequencies.
3. In a tan, two elongated stamped sheet metal members arranged crosswise and secured together at their middle portions; a blade formed on each end of each of said members to provide four radiating blades, each of said blades having a leading edge, a trailing edge and a tip, and stamped corrugations on the trailing edges of the two blades formed on one 01' said members, said corrugations serving to break up the rhythm of the sound waves produced by the blades.
4. In a fan, two elongated stamped sheet metal members arranged crosswise and secured together at their middle portions; a blade formed on each end of each of said members to provide four radiating blades, each of said blades having a being of different formation in order to set up in operation mutually interfering and deadening sound waves.
JAm E. PEL'I'IER.
US253518A 1939-01-30 1939-01-30 Fan blade Expired - Lifetime US2238749A (en)

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Cited By (70)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899128A (en) * 1959-08-11 Vaghi
US4089618A (en) * 1974-07-02 1978-05-16 Rotron Incorporated Fan with noise reduction
US4108573A (en) * 1977-01-26 1978-08-22 Westinghouse Electric Corp. Vibratory tuning of rotatable blades for elastic fluid machines
DE2358521A1 (en) * 1972-11-28 1979-08-30 Rolls Royce TURBINE BLADE FOR GAS TURBINE ENGINES
US4174924A (en) * 1975-10-21 1979-11-20 Wallace Murray Corporation Sheet metal fan assembly
US4249861A (en) * 1979-03-05 1981-02-10 Canadian Fram Limited Fan blade reinforcement plate
DE3137554A1 (en) * 1981-09-22 1983-03-31 Wilhelm Gebhardt Gmbh, 7112 Waldenburg "RADIAL FAN"
US4789117A (en) * 1986-12-29 1988-12-06 United Technologies Corporation Bodies with reduced base drag
US4830315A (en) * 1986-04-30 1989-05-16 United Technologies Corporation Airfoil-shaped body
US4859150A (en) * 1986-05-19 1989-08-22 Usui Kokusai Sangyo Kabushiki Kaisha Blades for low speed propeller fan
US4869644A (en) * 1986-03-22 1989-09-26 Usui Kokusai Sangyo Kabushiki Kaisha Blades for propeller fan
US4872484A (en) * 1988-12-12 1989-10-10 John Hickey System for controlling the flow of a fluid medium relative to an object
US4886421A (en) * 1984-01-09 1989-12-12 Wind Feather, United Science Asc. Wind turbine air foil
US4974633A (en) * 1989-12-19 1990-12-04 Hickey John J System for controlling the flow of a fluid medium relative to an object
US5000660A (en) * 1989-08-11 1991-03-19 Airflow Research And Manufacturing Corporation Variable skew fan
DE9013099U1 (en) * 1990-09-14 1991-11-07 Moser, Josef, 8058 Pretzen, De
US5075564A (en) * 1989-12-19 1991-12-24 Hickey John J Combined solar and wind powered generator with spiral surface pattern
US5173069A (en) * 1990-10-05 1992-12-22 Mainstream Marketing, Inc. Autorotative flyer
US5254876A (en) * 1992-05-28 1993-10-19 Hickey John J Combined solar and wind powered generator with spiral blades
US5463257A (en) * 1993-11-23 1995-10-31 Yea; Ton A. Wind power machine
US5482436A (en) * 1993-12-30 1996-01-09 Acme Engineering & Manufacturing Corp. High specific speed fan propeller having auxiliary blades
FR2790512A1 (en) * 1999-03-02 2000-09-08 Jean Claude Delplanque Improvements to gas turbine is to follow successive profiles of waved blades, along displacement of fluid in mobile wheel, with escape and attack edges forming letters X or Y
US6334705B1 (en) * 1998-10-01 2002-01-01 General Signal Corporation Fluid mixing impellers with shear generating venturi
WO2003076797A1 (en) * 2002-03-09 2003-09-18 Voith Siemens Hydro Power Generation Gmbh & Co.Kg Device for stabilizing the flow in hydraulic turbomachines
US6659724B2 (en) * 2001-02-07 2003-12-09 Denso Corporation Axial fan for vehicles
WO2004067956A1 (en) * 2003-01-30 2004-08-12 Josef Moser Rotor blade for a wind power station
US6872048B2 (en) * 2001-11-26 2005-03-29 Lennox Industries, Inc. Fan with reduced noise generation
US20050147498A1 (en) * 2004-01-02 2005-07-07 Tsan-Nan Chien Heat-dissipating module, fan structure and impeller thereof
EP1555090A1 (en) * 2004-01-16 2005-07-20 Hitachi Koki Co., Ltd. Combustion type power tool having fan
US20060263223A1 (en) * 2005-05-18 2006-11-23 Hartzell Fan, Inc. Fan blade with ridges
US20070234419A1 (en) * 2006-03-28 2007-10-04 Canon Kabushiki Kaisha Image forming apparatus, control method thereof, system, program, and storage medium
DE102006044332B3 (en) * 2006-09-19 2008-01-03 Karl Stern Rotor vane especially for underwater power station, has vibrator sheath arranged externally on vane and lying in the plane of the blade
CN101344014A (en) * 2007-07-09 2009-01-14 通用电气公司 Airfoil for use in rotary machines and method for fabricating same
US20100266428A1 (en) * 2008-01-07 2010-10-21 Suguru Nakagawa Propeller fan
DE102006044330B4 (en) * 2006-09-19 2010-11-11 Karl Stern vane rotor
WO2010130579A1 (en) * 2009-05-15 2010-11-18 BSH Bosch und Siemens Hausgeräte GmbH Fan wheel, fan comprising a fan wheel, laundry drying device comprising a fan, and method for producing a fan wheel
US20100329879A1 (en) * 2009-06-03 2010-12-30 Presz Jr Walter M Wind turbine blades with mixer lobes
US20110142665A1 (en) * 2010-11-10 2011-06-16 General Electric Company Noise reducer for rotor blade in wind turbine
US20110142666A1 (en) * 2010-11-15 2011-06-16 General Electric Company Noise reducer for rotor blade in wind turbine
US20110223030A1 (en) * 2010-12-16 2011-09-15 General Electric Company Noise reducer for rotor blade in wind turbine
US20120100001A1 (en) * 2010-10-20 2012-04-26 Zaward Corporation Fan structure
WO2012062249A1 (en) * 2010-06-08 2012-05-18 Koppenwallner Georg E Method for influencing the flow behavior of turbomachines, in particular blower devices or suction devices and associated blower device or suction device
US8414261B2 (en) 2011-05-31 2013-04-09 General Electric Company Noise reducer for rotor blade in wind turbine
CN103047180A (en) * 2011-10-12 2013-04-17 Lg电子株式会社 Axial flow fan and air conditioner
US8430638B2 (en) 2011-12-19 2013-04-30 General Electric Company Noise reducer for rotor blade in wind turbine
US20130270320A1 (en) * 2012-04-13 2013-10-17 Hilti Aktiengesellschaft Driving tool
US20140072435A1 (en) * 2012-09-12 2014-03-13 Seokho CHOI Fan
US20140255184A1 (en) * 2013-03-05 2014-09-11 Bell Helicopter Textron Inc. System and Method for Reducing Rotor Blade Noise
US8834127B2 (en) 2011-09-09 2014-09-16 General Electric Company Extension for rotor blade in wind turbine
US9121294B2 (en) 2011-12-20 2015-09-01 General Electric Company Fan blade with composite core and wavy wall trailing edge cladding
USD766658S1 (en) * 2014-11-06 2016-09-20 Outotec (Finland) Oy Impeller for mixer
CN106050319A (en) * 2016-06-14 2016-10-26 中国科学院工程热物理研究所 Large-attack-angle containment turbine blade used for aero gas turbine engine
US9494134B2 (en) 2013-11-20 2016-11-15 General Electric Company Noise reducing extension plate for rotor blade in wind turbine
US20170234134A1 (en) * 2016-02-12 2017-08-17 General Electric Company Riblets For A Flowpath Surface Of A Turbomachine
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CN108506247A (en) * 2018-05-09 2018-09-07 约克广州空调冷冻设备有限公司 Blade and use its axial wheel
US10180125B2 (en) 2015-04-20 2019-01-15 General Electric Company Airflow configuration for a wind turbine rotor blade
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US20190078450A1 (en) * 2017-09-08 2019-03-14 United Technologies Corporation Inlet guide vane having a varied trailing edge geometry
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US10584713B2 (en) 2018-01-05 2020-03-10 Spectrum Brands, Inc. Impeller assembly for use in an aquarium filter pump and methods
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US20220112901A1 (en) * 2019-01-23 2022-04-14 Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Würzburg Impeller of a motor vehicle
US11519422B2 (en) * 2018-05-09 2022-12-06 York Guangzhou Air Conditioning And Refrigeration Co., Ltd. Blade and axial flow impeller using same

Cited By (103)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899128A (en) * 1959-08-11 Vaghi
DE2358521A1 (en) * 1972-11-28 1979-08-30 Rolls Royce TURBINE BLADE FOR GAS TURBINE ENGINES
US4229140A (en) * 1972-11-28 1980-10-21 Rolls-Royce (1971) Ltd. Turbine blade
US4089618A (en) * 1974-07-02 1978-05-16 Rotron Incorporated Fan with noise reduction
US4174924A (en) * 1975-10-21 1979-11-20 Wallace Murray Corporation Sheet metal fan assembly
US4108573A (en) * 1977-01-26 1978-08-22 Westinghouse Electric Corp. Vibratory tuning of rotatable blades for elastic fluid machines
US4249861A (en) * 1979-03-05 1981-02-10 Canadian Fram Limited Fan blade reinforcement plate
DE3137554A1 (en) * 1981-09-22 1983-03-31 Wilhelm Gebhardt Gmbh, 7112 Waldenburg "RADIAL FAN"
US4886421A (en) * 1984-01-09 1989-12-12 Wind Feather, United Science Asc. Wind turbine air foil
US4869644A (en) * 1986-03-22 1989-09-26 Usui Kokusai Sangyo Kabushiki Kaisha Blades for propeller fan
US4830315A (en) * 1986-04-30 1989-05-16 United Technologies Corporation Airfoil-shaped body
US4859150A (en) * 1986-05-19 1989-08-22 Usui Kokusai Sangyo Kabushiki Kaisha Blades for low speed propeller fan
US4789117A (en) * 1986-12-29 1988-12-06 United Technologies Corporation Bodies with reduced base drag
US4872484A (en) * 1988-12-12 1989-10-10 John Hickey System for controlling the flow of a fluid medium relative to an object
US5000660A (en) * 1989-08-11 1991-03-19 Airflow Research And Manufacturing Corporation Variable skew fan
US4974633A (en) * 1989-12-19 1990-12-04 Hickey John J System for controlling the flow of a fluid medium relative to an object
US5075564A (en) * 1989-12-19 1991-12-24 Hickey John J Combined solar and wind powered generator with spiral surface pattern
DE9013099U1 (en) * 1990-09-14 1991-11-07 Moser, Josef, 8058 Pretzen, De
WO1992005341A1 (en) * 1990-09-14 1992-04-02 Josef Moser Rotor
US5173069A (en) * 1990-10-05 1992-12-22 Mainstream Marketing, Inc. Autorotative flyer
US5254876A (en) * 1992-05-28 1993-10-19 Hickey John J Combined solar and wind powered generator with spiral blades
US5463257A (en) * 1993-11-23 1995-10-31 Yea; Ton A. Wind power machine
US5482436A (en) * 1993-12-30 1996-01-09 Acme Engineering & Manufacturing Corp. High specific speed fan propeller having auxiliary blades
US6334705B1 (en) * 1998-10-01 2002-01-01 General Signal Corporation Fluid mixing impellers with shear generating venturi
FR2790512A1 (en) * 1999-03-02 2000-09-08 Jean Claude Delplanque Improvements to gas turbine is to follow successive profiles of waved blades, along displacement of fluid in mobile wheel, with escape and attack edges forming letters X or Y
US6659724B2 (en) * 2001-02-07 2003-12-09 Denso Corporation Axial fan for vehicles
US20050147496A1 (en) * 2001-11-26 2005-07-07 Lennox Industries, Inc. Fan with reduced noise generation
US6872048B2 (en) * 2001-11-26 2005-03-29 Lennox Industries, Inc. Fan with reduced noise generation
US7351041B2 (en) 2001-11-26 2008-04-01 Lennox Industries Inc. Fan with reduced noise generation
WO2003076797A1 (en) * 2002-03-09 2003-09-18 Voith Siemens Hydro Power Generation Gmbh & Co.Kg Device for stabilizing the flow in hydraulic turbomachines
WO2004067956A1 (en) * 2003-01-30 2004-08-12 Josef Moser Rotor blade for a wind power station
US7566203B2 (en) 2003-01-30 2009-07-28 Josef Moser Rotor blade
US20060018759A1 (en) * 2003-01-30 2006-01-26 Josef Moser Rotor blade
US20050147498A1 (en) * 2004-01-02 2005-07-07 Tsan-Nan Chien Heat-dissipating module, fan structure and impeller thereof
US7743955B2 (en) 2004-01-16 2010-06-29 Hitachi Koki Co., Ltd. Combustion type power tool having fan
US20050156007A1 (en) * 2004-01-16 2005-07-21 Tomomasa Nishikawa Combustion type power tool having fan
EP1555090A1 (en) * 2004-01-16 2005-07-20 Hitachi Koki Co., Ltd. Combustion type power tool having fan
AU2005200114B2 (en) * 2004-01-16 2010-04-08 Hitachi Koki Co., Ltd. Combustion type power tool having fan
US20060263223A1 (en) * 2005-05-18 2006-11-23 Hartzell Fan, Inc. Fan blade with ridges
US7494325B2 (en) 2005-05-18 2009-02-24 Hartzell Fan, Inc. Fan blade with ridges
US20070234419A1 (en) * 2006-03-28 2007-10-04 Canon Kabushiki Kaisha Image forming apparatus, control method thereof, system, program, and storage medium
DE102006044330B4 (en) * 2006-09-19 2010-11-11 Karl Stern vane rotor
DE102006044332B3 (en) * 2006-09-19 2008-01-03 Karl Stern Rotor vane especially for underwater power station, has vibrator sheath arranged externally on vane and lying in the plane of the blade
US8419372B2 (en) 2007-07-09 2013-04-16 General Electric Company Airfoil having reduced wake
CN101344014A (en) * 2007-07-09 2009-01-14 通用电气公司 Airfoil for use in rotary machines and method for fabricating same
CN101344014B (en) * 2007-07-09 2013-10-30 通用电气公司 Airfoil for use in rotary machines and method for fabricating same
US8083487B2 (en) * 2007-07-09 2011-12-27 General Electric Company Rotary airfoils and method for fabricating same
US20090013532A1 (en) * 2007-07-09 2009-01-15 Trevor Howard Wood Airfoils for use in rotary machines and method for fabricating same
US8721280B2 (en) * 2008-01-07 2014-05-13 Daikin Industries, Ltd. Propeller fan
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