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Realizing method of axial slot casing with low mixing losses

A realization method and axial technology, applied in mechanical equipment, machine/engine, liquid fuel engine, etc., can solve problems such as peak efficiency loss, reduce friction loss, enhance suction effect, and reduce mixing loss.

Active Publication Date: 2016-09-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing axial-slotted casing treatment introduces a significant loss in peak efficiency while extending the stability margin

Method used

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  • Realizing method of axial slot casing with low mixing losses
  • Realizing method of axial slot casing with low mixing losses
  • Realizing method of axial slot casing with low mixing losses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Some design parameters of the compressor rotor in this embodiment are shown in Table 1.

[0026] Table 1 Some design parameters of the rotor

[0027]

[0028]

[0029] Firstly, within the critical flow area of ​​the blade tip, determine the processing range and axial length of the treatment slot in the axial direction. After determining the radius of the front end circle and the radius of the rear end circle of the treatment slot, construct the inner and outer common tangent of the two circles. Arc, the obtained four arcs form a complete axial processing seam. The steps to achieve an axial seam casing with low blending losses include:

[0030] 1) The rotor blade is modeled, and the internal flow field is numerically simulated to obtain the tip flow field structure and flow characteristics near the stall point, and determine the critical flow area of ​​the tip.

[0031] 2) if image 3 As shown, determine the range of the treatment slot in the axial direction, wh...

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Abstract

The invention provides a realizing method of an axial slot casing with low mixing losses. First, the treatment range of a treatment slot in an axial direction and the axial length of the treatment slot are determined in the critical flow region range of a blade tip. After the radii of the front-end circle and the rear-end circle of the treatment slot are determined, the inner and outer common tangent arcs of the two circles are constructed, and an integral axial treatment slot consisting of four sections of arcs is obtained. In the invention, the flow field structure of the blade tip at a near stall point and the element geometrical characteristics of the blade tip are considered, the front-end jet velocity of the treatment slot is increased, mixing losses are reduced, and the pumping effect on the flow blockage of the blade tip is enhanced; and as the treatment slot consists of four sections of arcs, friction losses produced by fluid in the treatment slot are reduced.

Description

technical field [0001] The invention relates to a technology in the field of turbomachinery, in particular to a method for realizing an axial seam casing with low mixing loss. Background technique [0002] The higher the compressor load in an aeroengine, the more stringent the requirements for its stable operating range. The methods of improving the stability margin in compressor design include active control and passive control. Compared with active control, passive control technology has a simple structure and is easy to implement. Among many passive control technologies, casing processing technology is widely used because of its easy structural realization, low manufacturing cost, and convenient modification. Such as figure 1 , 2 As shown, the axial slit type casing treatment is a casing treatment structure with a remarkable stability expansion effect, including axial slits and axial oblique slits, which can obtain a large increase in stability margin. However, the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/52
CPCF04D29/522
Inventor 朱铭敏郑覃王立卢少鹏羌晓青滕金芳
Owner SHANGHAI JIAO TONG UNIV
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