一种进气道/发动机地面匹配试验方法

A Testing Method for Matching Characteristics of Intake and Engine on the Ground

为了在单发试验架上模拟单发停车与双发正常工作情况下的进/发匹配安全性,提出了一种进气道/发动机地面匹配试验方法。结果表明:在单发试验台架上,通过在进气道入口前飞机对称面位置加装隔板及取消隔板实现单发停车及双发工作状态的模拟,并根据对地面抽吸试验与缩比模型风洞试验进气道出口性能及总压恢复系数图谱的对比,证明加装隔板及取消隔板模拟双发工作与单发停车状态的合理性;根据流量标定试验结果,对抽吸试验进气道出口参数进行修正,获取全尺寸进气道更加精确的性能,并与缩比模型风洞试验结果对比,全尺寸进气道性能优于缩比模型风洞试验结果;通过发动机地面开车,有效模拟了双发工作与单发停车条件下发动机不同转速及加减速过程中的进发匹配特性,确保了飞机滑行及试飞安全。

In order to simulate the safety of intake/engine matching under the conditions of single engine failure and twin-engine operation on a single engine test bed,a ground test method for intake/engine matching was proposed.The results show that on the single engine test bed,the simulation of single engine failure and twin-engine operation can be realized by installing and removing a separator at the symmetrical plane of the aircraft in front of the inlet.Based on the comparison of the performance and total pressure recovery coefficient maps of the intake outlet between the ground pumping test and the scaled-model wind tunnel test,it was proved that the installing and removing separators were suitable to simulate the conditions of single engine failure and twin-engine operation.Results of the flow calibration test were used in correcting the intake outlet parameters from the pumping test to obtain more accurate performance of the full-scale intake,which was better than that of the scaled-model wind tunnel test.Through the ground test,the intake/engine matching characteristics at different speeds as well as acceleration and deceleration were effectively simulated under the conditions of single engine failure and twin-engine operation,which ensured the safety of aircraft during taxiing and flight test.