Centrifugal compressor volute with unidirectional-flow-guide casing treatment structure

Abstract

The invention provides a centrifugal compressor volute with a unidirectional-flow-guide casing treatment structure. The annular casing treatment structure is arranged at a position, close to the front edge of an impeller, of the inner side face of a compressor shell. An outwardly extending air outlet structure is arranged on the outer periphery of the annular casing treatment structure. A valve is mounted on the air outlet structure. When the impeller of the compressor is approximately in a stall condition, tip leaked air flow flows out via the annular casing treatment structure, the stable working range of the compressor is broadened effectively, and accordingly, the tip leaked air flow is guided to the exterior of the compressor through a one-way guide valve. Different from conventional casing treatment structures which re-guide the leaked air flow into an inlet of the compressor, the casing treatment structure of the centrifugal compressor volute directly guides the air flow to the exterior of the compressor, so that the interference effect of the high-entropy leaked air flow on incoming flow is reduced effectively, and the stable working range of the compressor is further widened.

Description

technical field [0001] The invention belongs to the technical field of exhaust gas turbocharging, and in particular relates to a centrifugal compressor volute with unidirectional flow casing treatment. Background technique [0002] According to the requirements of high power density and plateau power recovery of the internal combustion engine, the boost pressure ratio of the turbocharger compressor needs to be continuously increased, and it has a wide flow range, so that the turbocharger can be well matched with the engine. Widening the stable flow range of the high-pressure ratio centrifugal compressor has become one of the key technologies to achieve a good match between the supercharging system and the engine. Therefore, the casing processing technology is introduced into the expansion structure of the supercharger centrifugal compressor. This technology is to open one or two grooves on the leading edge of the impeller on the casing. When the impeller of the compressor i...

AI Technical Summary

Problems solved by technology

[0003] However, since the airflow that causes the compressor to stall flows out from the downstream of the compressor, it has high energy, and this part of the high-entropy airflow will interfere with the incoming flow of the compressor.

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