Casing treatment device for reducing stalling and surging of air compressor

Abstract

The invention provides a casing treatment device for reducing stalling and surging of an air compressor. The casing treatment device comprises a casing and a space ring. The casing comprises an air inlet shell and an impeller. An annular flow division groove is fixedly formed in the position, opposite to the side wall of the air inlet shell, of the front side of the front impeller edge of the impeller. The annular flow division groove is provided with an opening facing the interior of the air inlet shell. The space ring is in a barrel shape and is fixed to the inner side wall of the air inlet shell and located at the opening of the annular flow division groove. According to the casing treatment device for reducing stalling and surging of the air compressor, the space ring is adopted for automatically separating main flow and casing treatment inner flow, the casing treatment inner flow is guided to the impeller tip direction and the axial inflow direction, and therefore the mixing loss of the main flow and the casing treatment inner flow is reduced, and backflow or counterflow generated by the impeller tip area is suppressed more effectively; and therefore stalling and surging are reduced, and under the condition of large flow, the influence of the groove on the main flow is smaller than that in a conventional method, and the influence of the groove on efficiency can be reduced.

Description

technical field [0001] The invention belongs to the technical field of exhaust gas turbocharging, in particular to a casing treatment device for improving compressor stall and surge. Background technique [0002] As the power density of internal combustion engines increases, exhaust gas turbocharging is required to achieve higher pressure ratios. However, as the boost pressure ratio continues to increase, the Mach number at the impeller inlet continues to increase, and the internal flow of the centrifugal compressor changes to transonic flow, resulting in a decrease in the flow range and efficiency of the centrifugal compressor. However, for vehicle operating conditions, the engine speed range is wide. To achieve a good match between the turbocharger and the vehicle engine, the centrifugal compressor must have a wide and stable operating range. Widening the stable flow range of the high-pressure ratio centrifugal compressor has become one of the key technologies to achieve ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it is unreliable and often requires multiple slots

When the number of slots increases, the performance of the compressor will decrease when the flow rate is high. At the same time, there will be collision and mixing losses between the main flow and the flow inside the casing, which will reduce the stability of the flow. Therefore, there is an urgent need for a method to improve the internal flow of the casing. method, so that the overall stall and surge of the compressor are improved

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