可调收敛喷管发动机高空台冲压校准和测量性能近似修正方法

Investigation of performance approximate revision methods for engine with adjustable convergence nozzle in ram pressure calibration of altitude simulated test

针对控制规律与海拔高度相关带可调收敛喷管发动机,提出了在冲压条件下进行校准试验的方法。该方法通过冲压与等冲压试验结果比较获得修正系数,实现冲压条件下校准试验结果的近似修正。针对某型涡扇发动机,进行了高空台试验和总体性能仿真,获得了喷管控制偏差时发动机性能变化比例,基于冲压条件下试验结果修正得到了标准海平面条件下发动机性能。该方法表明:冲压条件下进行校准试验的方法是可行的,获取的发动机推力等主要性能参数与出厂试车结果相差小于2.0%。

A method of revising the performance of an engine with adjustable convergent nozzle caused by nozzle control deviation in ram pressure calibration of Altitude Simulated Test was presented.According to this method,the correction coefficient was obtained by comparing the test results under ram pressure condition with those under equal ram pressure condition.The approximate correction of calibration test results under the condition of ram pressure was realized.For a turbofan engine,the experiments in altitude test and the overall performance simulation were carried out.The variation of engine performance under nozzle control deviation was obtained,and the correction of calibration test results under ram pressure condition was realized.The results showed that this calibration test method was feasible under the condition of ram pressure,and the difference between the engine thrust and other main performance parameters obtained by the above method and the factory test results was less than 2.0%.