基于迭代法的CFM56-7B发动机风扇转速修正方法研究

Corrected Method of CFM56-7B Engine Fan Speed Based on Iteration

基于发动机试车台参数修正方法,提出一种研究CFM56—7B发动机风扇修正转速N_(1K)的精确计算方法;首先建立风扇转速标准化核心比例函数,以发动机生产厂家的历史数据为学习样本,构建指数修正因子α与风扇修正转速N_(1K)之间的函数模型;然后建立由风扇指示转速N_(1meas)和大气温度T_2计算风扇修正转速N_(1K)的迭代方法;最后将大量实际数据代人到迭代程序进行N_(1K)计算,对结果进行误差分析并与传统算法求解的N_(1K)进行对比;结果表明:通过自主方程迭代修正后的N_(1K)具有更高的精度,更接近于厂家系统的原始数据,有较高的创新性和实用价值并为航空发动机关键参数自主基线方程的建模提供理论基础。

One precise correction method for the fan speed of aircraft engines is proposed based on engine Test Cell data. Firstly, the fan standard kernel function model was established, then build the function model between index correction factor a and the corrected fan speeds N1K using the historical data as learning samples~ Secondly, the iteration method which consisted of Indicated Fan Speed N1 and air tem- perature T2 was set up to calculate corrected fan speeds. Finally, an iterative procedure was utilized to calculate N1K by a large number of ac- tual data. The error analysis was carried out on the calculation results which were compared with the traditional algorithm of N1K . The con clusion is drawn that the proposed iteration method is closer to the original factory model with higher accuracy, and it is more innovative and has practical value and it also provides theoretical basis for the independent baseline function of engine key parameters.