CN1208119A - Vane with composite concave-arc section and propeller with the vane - Google Patents
Vane with composite concave-arc section and propeller with the vane Download PDFInfo
- Publication number
- CN1208119A CN1208119A CN 97108180 CN97108180A CN1208119A CN 1208119 A CN1208119 A CN 1208119A CN 97108180 CN97108180 CN 97108180 CN 97108180 A CN97108180 A CN 97108180A CN 1208119 A CN1208119 A CN 1208119A
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- Prior art keywords
- blade
- concave arc
- propeller
- vane type
- profile
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2250/00—Geometry
- F05B2250/70—Shape
- F05B2250/71—Shape curved
- F05B2250/712—Shape curved concave
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- Hydraulic Turbines (AREA)
Abstract
The vane has traditional two-dimensional horizontal section and concave-arc radical section, which is formed by bending the traditional two-dimensional section integrally towards suction direction and has smooth transition between cross sections. The present invention may be used widely for wing, propeller and engine vane in airplane, propeller in ship, vane in turbine, fan, etc., and its use may result in raised speed and efficiency, reduced power consumption and saving in material.
Description
The present invention relates to a kind of concave arc composite vane type blade and propeller cavitation, belong to blade class in the motor, or belong to boats and ships, aircraft propeller cavitation class.
The mankind copy pinion to produce all kinds of aerofoil profile parts, blade in important several classes such as the steam turbine, turbine blade in the airplane engine, aircraft wing and propeller cavitation, propeller for watercraft etc., and formation conventional two-dimensional aerofoil profile wing theory, blade according to this theory manufacturing, wing, the horizontal blade profile of propeller blade all is to adopt the conventional two-dimensional aerofoil profile, it radially all is that horizontal dimensional airfoil is arranged in order and forms, adopt propeller cavitation that this blade makes since dimensional airfoil produce to push away (drawing) force coefficient less, it is lower to exist efficient, energy consumption is higher, the defective that the speed of a ship or plane is lower.
The purpose of this invention is to provide a kind of pushing away (drawing) thus the big efficient of force coefficient is higher, energy consumption is lower, the speed of a ship or plane concave arc composite vane type blade and aircraft, propeller for watercraft faster.
The objective of the invention is to be achieved in the following manner, the horizontal blade profile of this concave arc composite vane type blade still is the conventional two-dimensional aerofoil profile, its radially blade profile by conventional two-dimensional aerofoil profile overall radial to suction and the direction bending forms the concave arc aerofoil profile; Concave arc composite vane type propeller cavitation does not then change existing propeller arrangement state and technological level basically, only blade is transformed to concave arc composite vane type blade and forms.
Characteristics of the present invention be its generation to push away (drawing) force coefficient bigger, improve the speed of a ship or plane, thereby efficient increases, energy consumption reduces and the saving material, concave arc composite vane type model propeller according to this concave arc composite vane type principle is made, carry out open water test through " HUST's traffic science and ship model test towing tank test room of engineering college " and confirm (being called vertical cambered surface composite vane type propeller cavitation in the test report):
1, concave arc composite vane type propeller cavitation is compared with traditional oar, the maximum spacious water efficient of two oars near the time, the former thrust coefficient K
TIncrease more than 30% than traditional oar, torque coefficient also increases synchronously, under the equal advance coefficient of traditional oar peak efficiency, and the former thrust coefficient K
TIncrease more than 50% torque coefficient K, also corresponding increase than traditional oar; 2, concave arc composite vane type propeller cavitation is bigger than traditional oar from 0 advance coefficient zone during to the highest spacious water efficient; 3, compare in addition as from disk ratio, at K
TUnder the approaching situation of index, concave arc composite vane type propeller area ratio is little, thus can economize material, in light weight.Thereby the present invention can be widely used in the turbine blade of wing, propeller cavitation and the turbogenerator of aircraft, propeller for vessels, turbine blade and fan etc.
Accompanying drawing 1 is a concave arc composite vane type blade schematic representation, Fig. 2 be its A-A to sectional drawing, u is a rate of flow of fluid, α is the angle of attack; Fig. 3,4 is that concave arc composite vane type propeller arrangement schematic representation: Fig. 5 is concave arc composite vane type propeller arrangement transformation of the way schematic representation, B is that blade blade tip C is to blade root D length, H is two the vortex flow interaction schematic representation of concave arc action: Fig. 6 for adjacent two horizontal section A-A, B-B of concave arc aerofoil profile, 1 is propeller hub among the figure, the 2nd, and blade.
Embodiments of the invention are as follows:
1, the horizontal blade profile of concave arc composite vane type blade is the conventional two-dimensional aerofoil profile, radially blade profile forms the concave arc aerofoil profile by the slick and sly switching between the bending of suction surface direction, each section of conventional two-dimensional aerofoil profile overall radial, and the blade tip of its concave arc action H and blade arrives the ratio of radial length B of blade root at H: B; 0.001 between～0.4.So can make into this concave arc composite vane type blade such as the distortion paddle of blade such as wing etc. or propeller cavitation etc.
2, concave arc composite vane type propeller cavitation comprises propeller hub and blade, under structure that does not change traditional propeller basically and technological level situation, traditional blade is transformed to concave arc composite vane type blade gets final product, the blade 2 that forms with concave arc composite vane type blade more than two is promptly arranged on the propeller hub.
The lift of this concave arc composite vane type blade and propeller cavitation or the calculating that pushes away (drawing) force coefficient are according to concave arc composite vane type theory, this theory is to draw with reference to the dull and stereotyped wing method of the low speed in the Prandtl fluid mechanics outline in the conventional two-dimensional airfoil theory, the lift that is produced separately by horizontal blade profile and concave arc aerofoil profile two-part radially is superposition and obtain whole concave arc composite vane type blade total life mutually, radially the lift of concave arc aerofoil profile generation calculates referring to accompanying drawing 6, concave arc aerofoil profile two adjacent horizontal section A-A, B-B respectively produces an independent vortex flow, cause radially concave arc aerofoil profile upper surface is the convergence shape, two eddy current are drawn close in upper surface mutually, superposition, act on corresponding A-A, on the B-B section, so will have only 1/2nd circular rector effects on each cross section, so its lift coefficient formula is:
And laterally blade profile is the conventional two-dimensional aerofoil profile, so the formula of its lift coefficient is:
In above-mentioned (1), (2) two formulas: ρ is a fluid density, and u is the fluid relative velocity, and a is the angle of attack, and b is the aerofoil profile chord length, C
YBe lift coefficient.Because of two lift directions are identical, so the total life coefficient is:
CY
Always=CY
Directly+ CY
Horizontal=π a+2 π a=3 π a (3)
When formula (3) is used for calculating on the propeller cavitation, according to traditional propeller characteristic curve formula (4), (5), (6), (7),
J=V
A/nD (4)
KT=T/ρn
2D
4 (5)
KQ=Q/ρn
2D
5 (6)
η=KT·J/KQ·2π (7)
Can obtain the characteristic curve of concave arc composite vane type propeller cavitation, with traditional oar obvious difference be arranged, in the formula: J is an advance coefficient, VA is for advancing speed, D is an airscrew diameter, and n is an oar axle rotating speed, and KT is for pushing away (drawing) force coefficient, T is for pushing away (drawing) power, Q is a moment of torsion, and KQ is a torque coefficient, and η is a propeller efficiency, ρ is a fluid density, calculates in view of the above that the present invention is used for the propeller cavitation of boats and ships and the contrast of traditional oar characteristic is as follows:
Tradition oar 1: oar 2 of the present invention;
J
1=1 J
2=1.075268817
KT
1=0.00980665 KT
2=0.011338659
KQ
1=0.00980665 KT
2=0.011338659
η
1=0.159154943 η
2=0.1711343443
Be the thrust of establishing traditional oar 1 and the propeller cavitation 2 of invention in the aforementioned calculation, moment of torsion, advance speed, the diameter homogeneous phase is all 1, traditional oar tachometer value is 1, calculate oar tachometer value of the present invention is to draw under 0.93 situation.As seen, oar of the present invention has been compared following characteristics with traditional oar, under power is equal to situation:
1, the speed of a ship or plane improves more than 0.07527, has changed the characteristic curve rule of traditional oar over 100 years;
2, efficient improves more than 0.07527;
3, diameter little, in light weight, economize material and reduce cost, the above-mentioned theory analytical calculation is verified by the test of HUST's traffic science and ship model test towing tank test room of engineering college.
Claims (3)
1, a kind of concave arc composite vane type blade, the horizontal blade profile that it is characterized in that described concave arc composite vane type blade is the conventional two-dimensional aerofoil profile, its radially blade profile by conventional two-dimensional aerofoil profile overall radial to suction and between direction bending, each section slick and sly switching form the concave arc aerofoil profile.
2, a kind of concave arc composite vane type propeller cavitation, comprise propeller hub (1) and blade (2), the horizontal blade profile that it is characterized in that described blade (2) is the conventional two-dimensional aerofoil profile, its radially blade profile form the concave arc aerofoil profile by the slick and sly switching between the bending of suction surface direction, each section of conventional two-dimensional aerofoil profile overall radial.
3, according to claim 1,2 described concave arc composite vane type blade and propeller cavitations, the blade that it is characterized in that described blade and propeller cavitation radially bends concave arc action H and the blade blade tip ratio H to the radial length B of blade root: the scope of B is 0.001-0.4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97108180 CN1208119A (en) | 1997-08-07 | 1997-08-07 | Vane with composite concave-arc section and propeller with the vane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97108180 CN1208119A (en) | 1997-08-07 | 1997-08-07 | Vane with composite concave-arc section and propeller with the vane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1208119A true CN1208119A (en) | 1999-02-17 |
Family
ID=5170201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97108180 Pending CN1208119A (en) | 1997-08-07 | 1997-08-07 | Vane with composite concave-arc section and propeller with the vane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1208119A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511342A (en) * | 2012-06-19 | 2014-01-15 | 通用电气公司 | Airfoil shape for use in a compressor |
-
1997
- 1997-08-07 CN CN 97108180 patent/CN1208119A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511342A (en) * | 2012-06-19 | 2014-01-15 | 通用电气公司 | Airfoil shape for use in a compressor |
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| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |