Centrifugal Compressor Stability Expansion Method Based on Dual-function Coupling Profiles Controlling Diffuser End Wall

Abstract

The centrifugal compressor stability expansion method of the double-function coupling surface regulating diffuser end wall of the present invention comprises: firstly, by performing geometric modeling and numerical simulation on the original centrifugal compressor with bladed diffuser, analyzing The flow structure that induces instability, find out the most critical position that induces the sign of compressor stall, and determine the wall of the vane diffuser hub where the sign of stall occurs is determined as the key position of the shape; then, according to the flow law, the conventional planar end wall is transformed into a concave-convex shape The dual-function coupling profile with undulating characteristics can flexibly construct different forms of concave-convex end walls by adjusting the three profile control parameters. periodic array. The invention changes the flow velocity and pressure distribution near the wall by changing the geometric shape of the flow channel, effectively inhibits the flow separation of the centrifugal compressor under the small flow condition, delays the occurrence of rotational stall and surge, and thus broadens the stable operation range of the centrifugal compressor.

Description

technical field [0001] The invention belongs to the technical field of centrifugal compressors, and in particular relates to a method for stabilizing a centrifugal compressor by regulating the end wall of a diffuser with a dual-function coupling profile. Background technique [0002] Due to the advantages of small size, high single-stage pressure ratio and simple structure, centrifugal compressors play a vital role in metallurgy, petrochemical, natural gas transportation, refrigeration, electric power and other industries. With the continuous advancement of the modern industrial process, the development of high-load, wide-range, high-efficiency, and miniaturized centrifugal compressors is one of the current important trends, and more stringent requirements are put forward for the performance of centrifugal compressors. Throughout the research on centrifugal compressors by domestic and foreign scholars, it is found that the design of high-load centrifugal compressors can be r...

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Problems solved by technology

However, this method can only change the peak size of the non-axisymmetric end wall structure, and cannot change the circumferential concave-convex form and the change of the peak along the flow direction, resulting in a single concave-convex end wall form, which cannot realize the diversity of concave-convex end wall forms

Moreover, the shape of the end wall is not selected at the key position of flow instability, which only achieves the purpose of reducing the flow loss at the design point, but fails to achieve the effect of expanding stability.

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