飞机在试飞中有时会出现试飞得到的飞机性能与设计不相符的情况,通常是由于飞机阻力增加或者发动机推力减小造成的。本文介绍了流谱观测法和测压管法,用于确定飞机阻力增加的原因;通过测量和计算得到发动机推力偏差,根据相应原因,通过设计优化,使飞机性能满足设计方案的要求。 Aircraft sometimes appear in the flight test flight performance and design does not match the performance of the situation, usually due to increased aircraft resistance or reduced engine thrust caused. In this paper, the fluid spectrum observation and piezometric method are introduced to determine the cause of the increase of aircraft resistance. The thrust deviation of the engine is obtained through measurement and calculation. According to the corresponding reasons, the performance of the aircraft can meet the design requirements through design optimization.