关键词: 涡扇发动机;装机推力损失;推力直接确定;台架试验;装机地面试验;流量损失

Abstract: In order to evaluate installed gross thrust loss of one turbo-fan engine, the thrust measurement on ground test was carried out on direct thrust determination method. The accuracy of gross thrust measurement was improved by developing the processing method of mount thrust data, the computational method of air-inlet ram drags. The results show that the maximum error of thrust measurement was 2.41% in bed test and the errors in shutdown condition after landing are less than 0.8 kN among 11 flights, so the method basically meets thrust evaluation requirement. It is found that installed gross thrust loss presents a significant increase with the increase of engine power condition. The loss of corrected gross thrust reaches 17.95% in military intermediate condition and 27.72% in military maximum condition taking corrected gross thrust in the same condition in bed test as the benchmark. Through analysis of the key parameters such as corrected fan speed and corrected mass flow, it is concluded that due to the influence of the air-inlet, the mass flow is significantly less than that in the same condition in bed test and there is the excessive loss of the total pressure in the air-inlet. The two factors results in the installed gross thrust loss.