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用特征线法求解瞬态航空发动机空气系统的连续方程和动量方程,单独迭代求解能量方程.计算了空气系统内流体的压力、质量流量、温度随时间的变化规律.结果表明内部节点的压力、质量流量以相近的趋势随进口压力变化,但有相应的延迟,延迟时间约为0.01s,温度随边界温度变化而变化.将准静态结果与软件Flowmaster的模拟结果对比,吻合很好,压力最大相对误差为0.051%.
Using the characteristic line method to solve the continuous equation and momentum equation of the transient aero-engine air system, the energy equation was solved iteratively. The pressure, mass flow and temperature change with time of the fluid in the air system were calculated. The results show that the internal pressure, The mass flow rate varies with the inlet pressure in a similar trend, but with the corresponding delay, the delay time is about 0.01s, and the temperature changes with the boundary temperature.Comparing the quasi-static results with the software Flowmaster simulation results, the results are in good agreement with the maximum pressure The relative error is 0.051%.