航空发动机试验燃油流量测量滞后故障仿真与排除

Simulation and Elimination of the Hysteresis Failure of the Fuel Flow Measurement in Aero-Engine Tests

针对某型航空发动机起动燃油流量测量滞后、振荡及重复性较差的故障,建立了高空台燃油流量测试系统和发动机燃油控制系统数学模型,并进行了数值仿真分析,得出了供油管路内可压缩性气体是测量滞后的主要原因。通过故障再现试验,定量检验了管路内气体对燃油流量测量的影响,验证了仿真分析结果的正确性。依据仿真与验证试验结果,改进设计了燃油管路和操作程序,排除了故障。

To deal with hysteresis, vibration and repetition of the fuel flow measurements happened inaero-engine starting tests, a numerical simulation model was built for measurement system and fuel controlsystem at altitude test facility（ATF）. The analysis results show that the compressive air in fuel supply pipeis the main reason for failures above. Through failure reproduction tests, the effect of air in pipe on fuel flowmeasurement was quantified by instrument, and the simulation result was validated. According to the re-search efforts, the fuel pipe structure is improved, so is the operating program. Finally, the failure is elimi-nated.