涡扇发动机小偏差模型研究中部件特性图的运用

运用各部件特性进行涡扇发动机小偏差模型研究时,需用到风扇和压气机的通用特性图.为了解决部件通用特性图上数据不连续、不易准确获取,且不能提供物理参数相关微分信息等问题,首先提出一种改进的数学插值算法,该算法能保证特性数据插值结果及其一阶导数的连续性.然后推导给出了从换算参数微分变换到物理参数微分的计算式.实例表明,所给出的插值算法及推导的转换公式是正确、可行的.

Application of Component Characteristic Maps in Turbofan Engine Little Deviation Modeling

The general characteristic maps of fan and Compressor is necessary for turbofan engine little deviation modeling which based on component characteristics. In order to solve the problem of data discontinuity and difficulty in obtaining physical parameter, an improved mathematical interpolation method, which replaces the usual interpolation method, is presented to acquire needed parameters and partial differential values. Then, conversion formulae are given to acquire values of physical parameter partial differential from calculating parameter partial differential. The simulation example shows that the presented interpolation method and the conversion formulae are effective.