大涵道比涡扇发动机外涵推力系数确定及误差分配

Determination of Bypass Thrust Coefficient and Error Distribution of High Bypass Ratio Turbofan Engine

对大涵道比涡扇发动机而言,外涵喷管推力系数对性能计算结果影响较大。因此,确定外涵喷管推力系数对性能计算非常关键。本文给出了外涵道推力系数确定的计算方法,该方法将内涵道推力系数作为常量,将其影响综合考虑在外涵道推力系数中。结合某型涡扇发动机的部分参数的测量精度,利用该方法对其进行误差分配。结果表明,测量精度基本满足需求。

For the high bypass ratio turbofan engine, the bypass thrust coefficient has great influence on the calculation result of engine performance. Therefore, the determination of bypass thrust coefficient is very important for the performance calculation of engine. The calculation method of bypass thrust coefficient is given in the paper, which taken the core thrust coefficient as constant and incorporated the influences of core thrust coefficient into the bypass thrust coefficient. Combined with the measurement precision of a certain type of turbofan engine, this method is used for the parameter error distribution. The test results show that the measurement precision of the parameters can meet the demands.