多级轴流式压气机平均模型级特性获取方法

针对压气机的级特性计算问题,提出轴流式压气机平均模型级特性的概念,并对经典的相似定律进行改进,使相似工况下各级进出口运动相似条件得到满足.在保证高转速工作区压气机特性计算误差最小化的前提下,采用最优化方法辨识平均模型级特性,结合相似模化的修正方法外推得到模型级完整特性图,进而采用逐级计算的方法重构出压气机完整特性图.新方法改进了传统外推方法,计及到空气密度变化差异和压气机转速对压气机特性的影响,充分利用已有的压气机特性数据并能够在特性线外推中更好地体现压气机自身特性.

An Average Stage Characteristics Generation Method of Multistage Axial Flow Compressors

Concepts of average model stage characteristics of axial flow compressors were proposed.With modified scaling method,the new generation technique of average model stage characteristics can satisfy the analogy criterion perfectly.To minimize the error between the calculated characteristic and the test characteristic of the axial flow compressor at high rotational speeds,the average model stages performance characteristics are identified with optimization method.The total compressor performance characteristic maps are synthesized with the modified scaling method and the average model stage characteristics.The proposed technique improves the conventional scaling method so as to take into account the effect of air density change different and the rotational speed of the compressor,and it can make good use of available data which can reflect the own performance characteristics of the compressor.