A simple exponent extrapolation method of sub-idle characteristics on aero-engine was presented.Based on the basic theory of similarity of pump at low speed and taking the influence of air/gas compressibility into account,a correctional exponent extrapolation mathematic model was developed and was applied to supplement the sub-idle rotating component characteristics through selected two lowest speed line.The comparison between calculated results and original datas for a certain compressor and turbine characteristics indicated that this exponent extrapolation method is simple,general and has acceptable precision,and the supplemented sub-idle component characteristics can be applied to estimate the starting characteristics of aero-engine.%介绍了一种简便的航空发动机叶轮部件低状态特性的扩展方法.基于低转速泵相似理论,并考虑了空气/燃气的可压缩性影响,给出了修正的指数关系方程；针对已知的两条较低转速特性线外插得到更低转速状态的部件特性.结合已有叶轮部件特性进行有效性验证.结果表明方法具有较强的实用性、通用性和一定的精度,扩展得到的低状态部件特性可以满足发动机起动性能模拟的工程应用.
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