为了保证船用8级低压压气机在低工况稳定性不降低的前提下，同时提高设计点效率，通过数值模拟的方法研究展弦比优化对压气机设计点效率的影响。分析结果表明：展弦比的选取会影响主流区的流动损失和端壁二次流损失，进而影响压气机性能。优化了多级压气机后面级展弦比，将设计点效率提高了0.42%。同时，通过优化可转导叶偏转角度，确保了60%转速的喘振裕度不降低。

In order to improve the efficiency of design point without decreasing the stability of the marine stage 8 low pressure compressor under low working conditions,the influence of aspect ratio optimization on the efficiency of design point of the compressor was studied by numerical simulation.The results show that the selection of aspect ratio will affect the flow loss in the main flow area and the secondary flow loss in the endwall,and then affect the performance of the compressor.The aspect ratio of the rear stage of the multistage compressor is optimized,and the efficiency of the design point is increased by 0.42%.Meanwhile,the surge margin of 60% rotational speed is not reduced by optimizing the angle of the adjustable guide vanes.

TK474.8

国家自然科学基金区域创新发展联合基金（U20A20298）；国家科技重大专项（2017-II-0006-0019，2017-I-0009-0010）