CN1039874A - Hyperbola variable cross-section blade - Google Patents
Hyperbola variable cross-section blade Download PDFInfo
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- CN1039874A CN1039874A CN 88104774 CN88104774A CN1039874A CN 1039874 A CN1039874 A CN 1039874A CN 88104774 CN88104774 CN 88104774 CN 88104774 A CN88104774 A CN 88104774A CN 1039874 A CN1039874 A CN 1039874A
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- blade
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Abstract
Hyperbola variable cross-section blade of the present invention (1) is a kind of blade that is installed on the turbomachinery hub.Its effect is to adjust and the strengthening fluid dynamic effect, reduces an interior boundary layer secondary flow loss, solves technology root of blade FATIGUE FRACTURE PROBLEMS before.The present invention has derived the universal equation that exhibition combines with tangential aerofoil profile to hyperbola from mathematics, thereby makes blade (1) reasonable in design, is convenient to make.Can be widely used in the particularly technical innovation of axial-flow blower of turbomachinery of industries such as mining, metallurgy, machinery, improve its power character, Economy, the remarkable result of acquisition economize on electricity and noise reduction.
Description
Title of the present invention is hyperbola variable cross-section blade (1).
It is a kind of blade that is installed on the turbomachinery hub that hyperbola becomes a section blade (1).
Prior art for example F.P. FR2535406 has that two cross sections are double curvature shape, vertical cross-section is half elliptic blade, the blade curve the end of sharp-pointed (curvature is bigger) inwards and near vertical shaft.Between two blades be tilt (biasing) thus the wind that a blade is obtained can change that direction enters another blade so that quicken the purpose that air-flow reaches the driving generator.Double curvature shape is not that hyperbola does not more exist hyp mathematical relationship, and this kind configuration is not considered flow separation.At present, its exhibition of the turbomachinery blade that particularly axial-flow blower adopted that China uses is rectangle or trapezoidal to the cross section, on its leaf grating face, exist owing to there being ternary to flow, can not keep desirable columnar laminar flow, a kind of inevitable fluidised form distortion must cause the flow field built-in and layer, the increase root of blade of secondary flow loss, taper more are easy to generate the flow field disorder.Therefore reduced the utilization efficiency of axial-flow blower, produced higher noise, and increased the degree of fatigue of root of blade.
The present invention is the fluidised form of using hyperbola variable cross-section blade (1) standard and adjusting the turbomachinery flow field, to reduce interior boundary layer, a secondary flow loss and to have derived the mathematics universal equation that hyperbola variable cross-section blade (1) exhibition combines with the chordwise section airfoil geometry to the cross section hyperbola.The purpose of reached energy-conservation, noise reduction, avoiding the root of blade fatigue fracture and be easy to manufacture and design.
Its exhibition of hyperbola variable cross-section blade (1) is self axisymmetric hyperbola to arbitrary coordination coordinate cross section, and meets the hyperbola universal equation.
(X
2)/(a
3) - (y
2)/(b
2) =1
A represents that the real semiaxis of hyperbola is long in the formula, and b represents that the long x of hyperbola imaginary semi-axis represents tangential coordinate (abscissa), and y represents that exhibition is to coordinate (y coordinate).The operating mode that the b value can will be installed turbomachinery according to mechanical strength, safety coefficient and the blade of blade the selection of material was determined by pneumatic design choosing generation.Its b value of hyperbola that exhibition is to arbitrary coordination coordinate cross section for a kind of hyperbola variable cross-section blade (1) is a fixed number, and the change in location with the coordination coordinate does not change.The aerofoil profile equation of selection standard aerofoil profile or design is as the fundamental mode of this blade on a given chordwise section, hyp a value be this standard aerofoil profile (fundamental mode) position function promptly:
The a value changes with the variation of coordination coordinate.It is to belong to b value hyperbolic pattern such as a group that its exhibition of hyperbola variable cross-section blade (1) is self axisymmetric hyperbola to different coordination coordinates cross section.Fundamental mode coordinate on tangential meets its corresponding hyperbola universal equation.Tangential other all cross sections are the derivation aerofoil profile of this fundamental mode, and its coordinate meets corresponding hyperbola universal equation.
When hyperbola variable cross-section blade (1) needs adjustable pitch to install.Blade (1) is connected with riveted joint or casting mode with pole (5).Hyperbola variable cross-section blade (1) root is connected pole (5) with pole (5) with the downward round-corner transition extension mode of blade (1) and is arranged between this hyperbola variable cross-section blade (1) Pneumatic pressure center and the tangential center of gravity, generally be located at chord length about 40%, the bolt of pole (5) lower end can be made to change the pitch of hyperbola variable cross-section blade (1) and make on its hub that is fixed on turbomachinery.Hyperbola become to cut blade (1) when regulating as not needing pitch, hyperbola variable cross-section blade (1) can be directly and the hub of turbomachinery with welding or the mode of integral cast fixedly mounts.
It is standard and adjustment fluidised form in the flow field that hyperbola variable cross-section blade (1) exhibition is its effect of hyperbola to coordination coordinate cross section, and the turbomachinery that hyperbola variable cross-section blade (1) has been installed has operational efficiency height, noise, the lower advantage of vibration.Hyperbola variable cross-section blade (1) is because of its root, and taper has big relative thickness has guaranteed motion hyperbola variable cross-section blade (1) supporting from geometrical shape mechanical strength.Be connected with mode that pole (5) stretches with round-corner transition if any its roots of hyperbola variable cross-section blade (1) of pole (5) and can reduce pole (5) stress herein and concentrate, also because of pole (5) reasonably is arranged between hyperbola variable cross-section blade (1) Pneumatic pressure center and the tangential center of gravity, the safety reliability of pole (5) further is guaranteed and can saves the present material of doing pole with the high-quality high strength alloy steel.Hyperbola variable cross-section blade (1) can be pressed step and manufacture and design.The first, a selected standard aerofoil profile promptly is the fundamental mode of blade as the aerofoil profile of a certain chordwise section.The second, calculate choosing for going out the b value by mechanical strength and pneumatic, set up the function of a and fundamental mode coordinate parameters, and calculate a value of several different coordination coordinates.The 3rd, according to b and the hyp a value in different coordination coordinates cross section, draw several corresponding hyperbolas and make hyp piece model and can constitute vertical piece model.
The advantage that the present invention has energy-conservation, noise reduction, vibration damping, safety and is easy to manufacture and design than prior art.
Description of drawings:
Fig. 1: hyperbola variable cross-section blade stereogram.
Fig. 2: exhibition is to the rectangular blade stereogram in cross section.
Fig. 3: Figure of abstract.
Fig. 4: wait b hyperbolic pattern figure.
Optimum implementation
The long 276mm of hyperbola variable cross-section blade (1) exhibition, chord length 261mm, average thickness 13mm, b value 78mm, a maximum value 10.5mm, the material selection aluminum alloy, the standard aerofoil profile is selected RAF-bE for use.Pole (5) dangerous section 1030mm
2, be arranged on No. 45 steel of 41.5% chord length place material selection, connecting screw M39 * 2.The hyperbola variable cross-section blade of this specification (1) is installed on the axial-flow blower of rated speed 1500RPm, axial-flow blower diameter 1.8m, hub be than 0.7, its operational efficiency 90.3%, 95 decibels of A sound level noises have avoided the root of blade fatigue fracture to improve safety reliability.
Claims (3)
1, a kind of blade (1) that is installed on the turbomachinery hub is characterized in that this blade (1) exhibition is the hyperbola with self axial symmetry to the cross section, and chordwise section is the derivation aerofoil profile that meets Hyperbolic Equation.
2,, it is characterized in that this blade (1) exhibition is to determine that by the gentle dynamics calculation of mechanical strength real semiaxis length is specific aerofoil profile coordinate parameters function to the hyp imaginary semi-axis length in cross section by the described hyperbola variable cross-section blade of claim 1 (1).
3, by the described hyperbola variable cross-section blade of claim 1 (1), its pole (5) is arranged between blade (1) Pneumatic pressure center and the tangential center of gravity of blade (1) when it is characterized in that this blade (1) needs adjustable pitch to install.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88104774 CN1039874A (en) | 1988-07-28 | 1988-07-28 | Hyperbola variable cross-section blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88104774 CN1039874A (en) | 1988-07-28 | 1988-07-28 | Hyperbola variable cross-section blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1039874A true CN1039874A (en) | 1990-02-21 |
Family
ID=4833135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88104774 Pending CN1039874A (en) | 1988-07-28 | 1988-07-28 | Hyperbola variable cross-section blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1039874A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107355426A (en) * | 2017-08-16 | 2017-11-17 | 江苏中联风能机械股份有限公司 | A kind of super low noise bumps biomimetic type subway tunnel propeller fan movable vane piece |
| CN110268136A (en) * | 2017-02-02 | 2019-09-20 | 通用电气公司 | Controlled streaming runner for turbine |
-
1988
- 1988-07-28 CN CN 88104774 patent/CN1039874A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110268136A (en) * | 2017-02-02 | 2019-09-20 | 通用电气公司 | Controlled streaming runner for turbine |
| CN107355426A (en) * | 2017-08-16 | 2017-11-17 | 江苏中联风能机械股份有限公司 | A kind of super low noise bumps biomimetic type subway tunnel propeller fan movable vane piece |
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