某型涡扇发动机地面台架起动试验研究

为了分析大气环境温度对发动机起动过程的影响，采用三段积分法计算发动机起动特性，开展了不 同大气环境温度条件下某型涡扇发动机地面起动试验研究。结果表明：冷态条件下，发动机的起动特性与理 论计算结果一致，标准大气温度下发动机起动时间和脱开时间均为最短;热态条件下，发动机起动最快时的 大气温度比理论计算温度低2 K左右，起动时间和脱开时间均快于冷态时间（约快2.9 A#热态起动比冷态起 动的风扇、压气机转速出现时间早约0.5 a热态供油压力、排气温度的建立更早;分析认为，热态试验结果比 理论计算温度低的原因与大气温度变化引起的燃油粘度、滑油粘度、空气密度等变化及热态发动机焓值的变 化有关。该试验研究结果可为地面起动试验提供参考。

Research on Ground Bench Starting Test of a Certain Type of Turbofan Engine

In order to analyze the impact of atmospheric environment on the engine starting process, the three segment integration method was used to calculate the engine starting characteristics. Ground starting experiments were conducted on a certain type of turbofan engine under different atmospheric temperature conditions. The results show that the starting characteristics of the engine under cold condition are consistent with the theoretical calculation results, and the starting time and disconnection time of the engine under standard atmosphere temperature are the shortest. Under hot conditions, the atmospheric temperature at the fastest engine start is about 2 Klower than the theoretical calculation temperature, and the start and release time are both faster than the cold time ( about 2.9 s faster). The occurrence time of the fan and compressor speed in hot start is about 0. 5 s earlier than that in cold start, and the establishment of hot supply pressure and exhaust temperature is earlier. The analysis shows that the reason why the hot test result is lower than the theoretical calculation temperature is related to the changes of fuel viscosity, oil viscosity, density of air, etc. caused by the change of atmospheric temperature, and the change of enthalpy value of the hot engine. The research results of this experiment can provide reference for ground experiments.