Effect of bleed on efficiency evaluation of high pressure compressor

On the basis of summarizing the differences and correlations between temperature rise efficiency and torque efficiency, two kinds of isentropic efficiency evaluation methods for the high pressure compressor with inter stage bleed are studied in this paper. The influence of inter stage bleed parameters on the two isentropic efficiency corrections is discussed, and the experimental verification is carried out. The results show that: the torque efficiency is always lower than the temperature rise efficiency due to the mechanical transmission loss of the compressor; the temperature rise efficiency of the compressor before and after the correction of the inter stage bleed parameters has no significant difference, and the variation range is within ±0.5%; considering the correction of inter stage bleed parameters, the torque efficiency of the compressor can be significantly reduced, but the relative decrease is not more than the total bleed rate, and the reduction degree is related to the bleed rate and the stage position where the bleed is located; when the inter stage bleed with a large flow rate is conducted at the inlet side of the compressor, the torque efficiency should be corrected, otherwise the torque efficiency may be greater than the temperature rise efficiency.