单级压气机性能衰退定量研究

Quantitative research on performance degradation of single-stage compressor

压气机叶形改变会导致其性能的下降.以往计算其性能衰退通常假定叶形表面变化是均匀的,或在性能模型中引入损失系数,结果会产生误差.采用在易积垢部位增加随机尺寸的方法来模拟叶片积垢等原因造成的形状改变,并分析了叶片积垢、叶顶间隙增大等因素对压气机性能的影响.通过仿真获得了压气机在各种不同工况下性能定量衰退程度,以及压气机叶片表面气流流场、总温的变化情况.结果对发动机性能衰退研究和故障分析具有一定的理论与应用价值.

The change of the blade shape will result in the performance degradation of compressor.Traditionally,the calculation of the compressor performance degradation is accomplished by assuming that the blade surface varies evenly,or the loss coefficient is introduced into the model,which often produces error.The paper simulated the change of the blade shape caused by fouling using the method of adding random size in the fouling position.Meanwhile,the effect of the ingredients of the blade foul and tip clearance increase on the compressor performance was analyzed.The quantitative performance degradation at different work conditions,and the change of the air float field and the total temperature around the blade surface were gained.The results offer theoretical and applicative value for the research of the engine performance degradation and fault analysis.