压气机中介机匣全流量工况特性的数值研究

To evacuate the performance of the compressor intermediate duct (CID) comprehensively, the throttle characteristic was defined from the perspectives of the upstream and downstream matching. It was proposed that the performance of CID should be evacuated from three aspects, which are flow loss, outlet distortion and flow blockage, within the range of full mass flow working conditions. The corresponding evacuating expressions were deduced. To acquire the performance parameters and flow mechanism of full mass flow working conditions, CID flow fields of a small turbofan engine were calculated by numerical methods in uniform and actual non-uniform total pressure distribution conditions. The results show that the flow loss and the outlet distortion increase with the mass flow. In the actual non-uniform inlet condition, the flow loss and the outlet distortion are much higher than those in uniform inlet condition. When the design mass flow is close to the maximum value of the CID, the chocking mass flow of co-working between the CID and the compressor decreases obviously. It can be concluded that the actual inlet condition and off-design points should be considered during evaluating CIDs and sufficient flow margin should be ensured during designing or matching CIDs.