US2160323A - Propeller - Google Patents
Propeller Download PDFInfo
- Publication number
- US2160323A US2160323A US148373A US14837337A US2160323A US 2160323 A US2160323 A US 2160323A US 148373 A US148373 A US 148373A US 14837337 A US14837337 A US 14837337A US 2160323 A US2160323 A US 2160323A
- Authority
- US
- United States
- Prior art keywords
- blade
- vacuum
- slot
- face
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/141—Shape, i.e. outer, aerodynamic form
- F01D5/146—Shape, i.e. outer, aerodynamic form of blades with tandem configuration, split blades or slotted blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
- F04D29/682—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps by fluid extraction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
- F04D29/684—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps by fluid injection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S415/00—Rotary kinetic fluid motors or pumps
- Y10S415/914—Device to control boundary layer
Definitions
- This invention relates to a propeller, the general object of the invention being to provide means whereby air or other fluid is forced from the pressure side to the vacuum side in such a manner as to relieve the vacuum on the vacuum or rear face of the propeller and this also eliminates the roaring sound and enables the propeller to be driven with less effort.
- Figure 1 is a view of the front face of a pro- 80 peller constructed in accordance with this invention.
- Figure 2 is a view of the rear face of the propeller.
- Figure 3 is a section on the line 3-3 of Figure 2, this figure showing in dotted lines how the slot causes the air passing therethrough to pass over the vacuum face of the blade.
- the propeller is made as usual with the hub portion l and the two blades 2, each blade is tilted in the usual manner and tapers from its leading edge 3 to its trailing edge 4 and the pressure face 5 of the blade is substantially flat while the vacuum or rear face 6 is shaped as shown in Figure 3.
- each blade with a slot 1 which passes at an angle through the blade from the face 5 to the face 6, the slot starting at a point adjacent the leading edge 3 and terminating in the vacuum face 6 at a point closer to the trailing edge than the leading edge.
- the slots are slightly inclined with respect to the longitudinal axis of the blade with their inner ends located closer to the leading edge than are their outer ends.
- Each slot is formed with a fiat sloping front wall 1 and the rear wall parallels the front wall for the major portion of its length but terminates in a rounded portion 1" where it joins the vacuum face 6 of the blade.
- the outlet end of the slot is wider than the entrance end and this provides a free flow of air through the slot and there is no danger of the air flow being retarded which would act as a resistance to the movement of the blade through the air.
- the slot is made inclined to the longitudinal axis of the blade for the reason that a part of the 15 blade near the hub is traveling slower than a part of the blade remote from the hub. Therefore, there would be more vacuum created at said point remote from the hub.
- the help of the atmosphere is depended upon to a certain extent 20 to curve the air stream through the slot around the vacuum part of the blade it is necessary that the air escapes from the slot nearer the trailing edge at the outer end of the blade than near the hub in order to offset for the difference in the traveling speed and varying vacuum effect as the slotted part recedes from the hub.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
May 30, 1939. A T 2,160,323
PROPELLER Filed June 15, 1937 Inventor 215.362/"0377 2mm 7 M 5m A iior neys Patented May 30, 1939 UNITED STATES PATENT OFFICE 1 Claim.
This invention relates to a propeller, the general object of the invention being to provide means whereby air or other fluid is forced from the pressure side to the vacuum side in such a manner as to relieve the vacuum on the vacuum or rear face of the propeller and this also eliminates the roaring sound and enables the propeller to be driven with less effort.
This invention also consists in certain other features of construction and in the combination and arrangement of several parts, to be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claim.
In describing the invention in detail, reference will be had to the accompanying drawing Wherein like characters denote like or corresponding parts throughout the several views, and in which:
Figure 1 is a view of the front face of a pro- 80 peller constructed in accordance with this invention.
Figure 2 is a view of the rear face of the propeller.
Figure 3 is a section on the line 3-3 of Figure 2, this figure showing in dotted lines how the slot causes the air passing therethrough to pass over the vacuum face of the blade.
In this drawing the propeller is made as usual with the hub portion l and the two blades 2, each blade is tilted in the usual manner and tapers from its leading edge 3 to its trailing edge 4 and the pressure face 5 of the blade is substantially flat while the vacuum or rear face 6 is shaped as shown in Figure 3.
In carrying out my invention I form each blade with a slot 1 which passes at an angle through the blade from the face 5 to the face 6, the slot starting at a point adjacent the leading edge 3 and terminating in the vacuum face 6 at a point closer to the trailing edge than the leading edge. The slots are slightly inclined with respect to the longitudinal axis of the blade with their inner ends located closer to the leading edge than are their outer ends. Each slot is formed with a fiat sloping front wall 1 and the rear wall parallels the front wall for the major portion of its length but terminates in a rounded portion 1" where it joins the vacuum face 6 of the blade. Thus the outlet end of the slot is wider than the entrance end and this provides a free flow of air through the slot and there is no danger of the air flow being retarded which would act as a resistance to the movement of the blade through the air.
Thus, as shown in dotted lines in Figure 3,
some of the air or fluid contacting the pressure face or the blade is forced through the slot and emerges at the vacuum face and this air flows along the vacuum face so as to relieve the vacuum and eliminate the roaring noises caused by vacuum. As the air passes through the slot it strikes the flat sloping front wall 1 of the slot which 5 directs the air along the rear portion of the top face of the blade and thus relieves the vacuum that would occur there if the slot was eliminated. This flat wall of the slot must be cut at the exact angle for the particular blade on which it is 10 used as it is the angle of this wall that controls the air stream across that part of the blade where the vacuum would be created.
The slot is made inclined to the longitudinal axis of the blade for the reason that a part of the 15 blade near the hub is traveling slower than a part of the blade remote from the hub. Therefore, there would be more vacuum created at said point remote from the hub. As the help of the atmosphere is depended upon to a certain extent 20 to curve the air stream through the slot around the vacuum part of the blade it is necessary that the air escapes from the slot nearer the trailing edge at the outer end of the blade than near the hub in order to offset for the difference in the traveling speed and varying vacuum effect as the slotted part recedes from the hub.
It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent. 30
It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claim. 35
What is claimed is:
In a propeller of the class described, a blade of. solid construction and having a pressure face and a vacuum face and said blade having a longitudinally extending elongated slot therein, the hub end of which is farther from the trailing edge than is the tip end thereof from said edge, said slot sloping gradually from a point on the pressure face adjacent the leading edge of the blade to a point on the vacuum face closer to the trailing 5 edge than the leading edge, the sloping front wall of the slot being fiat and acting to direct the air passing through the slot along the rear portion of the vacuum face of the blade and the major part of the rear wall of the slot paralleling the 50 front wall but terminating in a curved portion which merges into the rear part of the vacuum face of the blade, the air passing'through said slot acting to relieve the vacuum on the vacuum 55 side of the blade.
TRACY B. BARNETT.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US148373A US2160323A (en) | 1937-06-15 | 1937-06-15 | Propeller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US148373A US2160323A (en) | 1937-06-15 | 1937-06-15 | Propeller |
Publications (1)
Publication Number | Publication Date |
---|---|
US2160323A true US2160323A (en) | 1939-05-30 |
Family
ID=22525492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US148373A Expired - Lifetime US2160323A (en) | 1937-06-15 | 1937-06-15 | Propeller |
Country Status (1)
Country | Link |
---|---|
US (1) | US2160323A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3044559A (en) * | 1959-07-14 | 1962-07-17 | Chajmik Joseph | Propeller |
US3180424A (en) * | 1963-03-25 | 1965-04-27 | Constantine A Serrindes | Propeller structure |
US3195807A (en) * | 1958-10-20 | 1965-07-20 | Gen Dynamics Corp | Turbo-machine with slotted blades |
FR2438156A1 (en) * | 1978-10-05 | 1980-04-30 | Alsthom Atlantique | Turbine blade ring - has holes drilled in blades to relieve fluid build up due to centrifugal force |
EP1118747A2 (en) * | 2000-01-22 | 2001-07-25 | Rolls-Royce Plc | An aerofoil for an axial flow turbomachine |
US20040174769A1 (en) * | 2003-03-03 | 2004-09-09 | Spx Corporation | Aeration apparatus and method |
WO2010046502A1 (en) * | 2008-10-24 | 2010-04-29 | Creaidea B.V. | Propeller for gas displacement apparatus |
US20100111703A1 (en) * | 2006-10-02 | 2010-05-06 | Colin David Chamberlain | Safety propeller |
US20100303634A1 (en) * | 2009-05-29 | 2010-12-02 | Sustained Energy Recovery Systems, Llc | Fluid dynamic section having escapelet openings for reducing induced and interference drag, and energizing stagnant flow |
US20120148396A1 (en) * | 2010-12-08 | 2012-06-14 | Rolls-Royce Deutschland Ltd & Co Kg | Fluid-flow machine - blade with hybrid profile configuration |
US8764380B2 (en) | 2010-07-07 | 2014-07-01 | Rolls-Royce Plc | Rotor blade |
ITMI20130791A1 (en) * | 2013-05-14 | 2014-11-15 | Cofimco Srl | AXIAL FAN |
EP3509945A4 (en) * | 2016-09-07 | 2019-11-20 | Nyíri, Attila | Aerodynamic regulation of airscrew-, fan- and wind turbine blades with bores and/or cutting and/or notching |
EP3984882A1 (en) | 2020-10-14 | 2022-04-20 | Círus, Róbert | Propeller and propeller blade |
-
1937
- 1937-06-15 US US148373A patent/US2160323A/en not_active Expired - Lifetime
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3195807A (en) * | 1958-10-20 | 1965-07-20 | Gen Dynamics Corp | Turbo-machine with slotted blades |
US3044559A (en) * | 1959-07-14 | 1962-07-17 | Chajmik Joseph | Propeller |
US3180424A (en) * | 1963-03-25 | 1965-04-27 | Constantine A Serrindes | Propeller structure |
FR2438156A1 (en) * | 1978-10-05 | 1980-04-30 | Alsthom Atlantique | Turbine blade ring - has holes drilled in blades to relieve fluid build up due to centrifugal force |
EP1118747A2 (en) * | 2000-01-22 | 2001-07-25 | Rolls-Royce Plc | An aerofoil for an axial flow turbomachine |
EP1118747A3 (en) * | 2000-01-22 | 2003-01-08 | Rolls-Royce Plc | An aerofoil for an axial flow turbomachine |
US20040174769A1 (en) * | 2003-03-03 | 2004-09-09 | Spx Corporation | Aeration apparatus and method |
US7114844B2 (en) * | 2003-03-03 | 2006-10-03 | Spx Corporation | Aeration apparatus and method |
US8491268B2 (en) * | 2006-10-02 | 2013-07-23 | Colin David Chamberlain | Safety propeller |
US20100111703A1 (en) * | 2006-10-02 | 2010-05-06 | Colin David Chamberlain | Safety propeller |
WO2010046502A1 (en) * | 2008-10-24 | 2010-04-29 | Creaidea B.V. | Propeller for gas displacement apparatus |
US20100303634A1 (en) * | 2009-05-29 | 2010-12-02 | Sustained Energy Recovery Systems, Llc | Fluid dynamic section having escapelet openings for reducing induced and interference drag, and energizing stagnant flow |
US8651813B2 (en) * | 2009-05-29 | 2014-02-18 | Donald James Long | Fluid dynamic body having escapelet openings for reducing induced and interference drag, and energizing stagnant flow |
US8764380B2 (en) | 2010-07-07 | 2014-07-01 | Rolls-Royce Plc | Rotor blade |
US20120148396A1 (en) * | 2010-12-08 | 2012-06-14 | Rolls-Royce Deutschland Ltd & Co Kg | Fluid-flow machine - blade with hybrid profile configuration |
US9394794B2 (en) * | 2010-12-08 | 2016-07-19 | Rolls-Royce Deutschland Ltd & Co Kg | Fluid-flow machine—blade with hybrid profile configuration |
ITMI20130791A1 (en) * | 2013-05-14 | 2014-11-15 | Cofimco Srl | AXIAL FAN |
US20160138601A1 (en) * | 2013-05-14 | 2016-05-19 | Cofimco S.R.L. | Axial fan |
US10036392B2 (en) * | 2013-05-14 | 2018-07-31 | Cofimco S.R.L. | Axial fan for industrial use |
EP3509945A4 (en) * | 2016-09-07 | 2019-11-20 | Nyíri, Attila | Aerodynamic regulation of airscrew-, fan- and wind turbine blades with bores and/or cutting and/or notching |
EP3984882A1 (en) | 2020-10-14 | 2022-04-20 | Círus, Róbert | Propeller and propeller blade |
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