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Method for improving air compressor blade load by using pumping and sucking

A compressor and load technology, which is applied in the design of compressor blades and high-load fans, can solve the problems that the blade load cannot be increased, the loss coefficient can be reduced, and the gas cannot be used, so as to improve the resistance to separation, increase the blade load, Eliminate the effect of separation

Inactive Publication Date: 2010-01-13
BEIHANG UNIV
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  • Description
  • Claims
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Problems solved by technology

[0006] To sum up, at present, in the flow control of fans and compressors, the flow control method of simply blowing or sucking air is still adopted. The disadvantage of this method is that the pumping or sucking of air must be completed by complex actuators and the extracted gas cannot Utilization, so that the flow rate is reduced, the load on the blades cannot be increased and the loss coefficient can be reduced

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  • Method for improving air compressor blade load by using pumping and sucking
  • Method for improving air compressor blade load by using pumping and sucking
  • Method for improving air compressor blade load by using pumping and sucking

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Embodiment Construction

[0029] Taking the NACA0012 airfoil as an example, considering the thin trailing edge of the airfoil, the middle and rear part of the airfoil is thickened according to the requirements of the processing technology and other aspects of the method of controlling the boundary layer by blowing and sucking air. The middle arc adopts a circular arc, and the comparison diagram of the blade shape before and after the modification is as follows figure 1 , where the dotted line shows the prototype. The consistency of the cascade is 0.87, the bending angle of the blade shape is 60 degrees, and the chord length of the blade is 113.2mm.

[0030](1) Calculate the flow field of the cascade according to the geometric parameters of the blade surface, such as the cascade consistency, blade bending angle and blade chord length, etc., and obtain the Mach number distribution curve of the blade back, and determine the suction peak position of the blade back according to this curve, that is, figure ...

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Abstract

The present invention relates to a method capable of utilizing suction to raise compressor cascade load. Said method includes the following several main steps: according to the blade moulding surface geometric parameter utilizing hydro mechanical calculation method to calculate cascade flow field and obtain blade back MACH-number distribution curve; according to said curve defining suction peak position; according to the blade moulding surface geometric parameter calculating cascade flow field to obtain blade back separation zone starting position; according to blade moulding surface treating blade moulding surface; in the blade back suction peak position setting blowing section; according to theory and numerical research result selecting and defining blowing opening width; in the blade back separation zone starting position setting suction section; according to theory and numerical research result selecting and defining suction opening width, so that said method can greatly raise load of blade and can reduce loss coefficient.

Description

technical field [0001] The invention relates to the design of high-load fans and compressor blades in modern aero-engines, especially a method for increasing the load of compressor blade cascades. Background technique [0002] The requirement of high-performance aeroengine for the compression system is to continuously increase the boost ratio and reduce the size and weight. To achieve this, it is necessary to design fans and compressors with higher and higher single-stage boost ratios and larger loads. machine. At present, there are two main methods to increase the single-stage pressure ratio of the fan and the compressor: the first is to use advanced computational fluid dynamics technology to finely organize the internal flow of the fan and compressor blade channels, and use the bending and sweeping combination technology to control the shock wave Shape and strength, so as to achieve high-load fan and compressor design, this method has greatly improved the performance of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/38
Inventor 邹正平刘火星叶建
Owner BEIHANG UNIV
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