Asymmetric double-circular-arc chute processing casing

A processing casing, asymmetric technology, used in mechanical equipment, non-variable displacement pumps, machines/engines, etc., can solve the problem of reducing the peak efficiency of the compressor, large vortex loss in the processing tank, and inconsistency in the geometric structure design and distribution of the processing tank. Reasonableness etc.

Inactive Publication Date: 2012-10-03
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Summing up the traditional casing technology, there is such a disadvantage: while improving the stability margin of the compressor, it is always at the cost of reducing the insulation efficiency
[0007] One of the most important reasons why the traditional treatment casing reduces the peak efficiency of the compressor is the unreasonable geometric design and distribution of the treatmen...

Method used

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  • Asymmetric double-circular-arc chute processing casing
  • Asymmetric double-circular-arc chute processing casing
  • Asymmetric double-circular-arc chute processing casing

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Embodiment Construction

[0029] Taking a single rotor of a transonic compressor as an example to illustrate the specific implementation of the present invention, the design parameters of the compressor rotor and stator are shown in Table 1 and Table 2. Due to the large corner, the stator adopts a tandem design.

[0030] Table 1 Transonic axial flow compressor rotor Table 2 Transonic axial flow compressor stator design parameters

[0031]

[0032]

[0033] According to the design method in the summary of the invention, the following design is carried out:

[0034] (1) Determine the number of processing tanks in the entire circumference N=88, remove 44 tanks in the non-processing area, and place 26 processing tanks and 18 processing tanks in the remaining 106° and 74° processing areas, respectively.

[0035] (2) The axial projection length of the processing tank L H =1.085×35mm=38mm, L b =35mm

[0036] (3) The radial inclination angle of the processing groove Alpha is 45°

[0037] (4) The processing tank is on th...

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Abstract

The invention relates to an asymmetric double-circular-arc chute processing casing, which is applied to a tip region of a rotor blade of an axial flow gas compressor. The design of the asymmetric double-circular-arc chute processing casing is as follows: firstly, a circular-arc chute processing casing is used as a base and a circular-arc groove bottom structure is additionally arranged, so that a radial direction and an axial direction of the processing casing are circular-arc structures; an asymmetric structure is adopted in a peripheral direction and the peripheral direction is divided into two processing regions and two non-processing regions in 360 degrees; and the two processing regions are 106 degrees and 74 degrees respectively and are divided by two 90-degree non-processing regions. Therefore, on one hand, a double-circular-arc structure is used for avoiding greater flowing loss caused by rectangular and trapezoid designs; and on the other hand, the asymmetric structure is used for simultaneously generating coupling stimulation effect on different vortexes, so that the margin of the gas compressor is greatly improved and the efficiency is not reduced.

Description

Technical field [0001] The invention relates to a device for improving the stability margin of a compressor, in particular to an asymmetric double-arc chute processing casing which can obviously improve the stability margin of the compressor without reducing its peak efficiency. Background technique [0002] Compressors are widely used in aero engines and industrial production. With the continuous improvement of the compressor stage load factor, the unstable flow of the compressor has become increasingly prominent, such as rotating stall, surge, etc., which greatly limits the further improvement of compressor performance. When a rotating stall occurs, there are one or more low-energy stall groups that rotate in the circumferential direction of the compressor. The performance of the compressor will suddenly drop, and the flow rate, pressure ratio and efficiency will all drop to the lowest point, and will cause periodicity to the compressor blades. Exciting force, even causing sur...

Claims

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Application Information

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IPC IPC(8): F04D29/00
CPCF04D29/685
Inventor 袁巍宋浩飞陆亚钧
Owner BEIHANG UNIV
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