Asymmetric double-circular-arc chute processing casing

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...

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 treatment slots

At least one of the two directions of R (radial direction) and Z (axial direction) in the processing slot of the traditional processing casing is rectangular or trapezoidal. This non-streamlined design will inevitably cause a large Vortex loss

However, the axisymmetric design in the overall circumferential direction cannot generate coupling excitation for different vortices at the same time.

Images