脉冲爆震发动机尾焰温度测量与数值模拟

EXPERIMENTS AND SIMULATION OF PULSED DETONATION ENGINE PLUME

本文采用新型研制的脉冲温度和水蒸气浓度测量仪测量了吸气式脉冲爆震发动机多循环工作过程中的尾焰温度,结果表明该测量仪不仅能够很好地捕捉每一个脉冲温度,与热成像仪测量的结果比较证明其测量温度在误差范围内.并采用了三阶TVD迎风格式和Strang-splitting算子分裂法,C_3H_8/ai r单步反应机理对混合物爆震燃烧进行了二维数值计算.与测量结果对比,说明采用本文的计算方法能够很好地捕捉到爆震波的点火和传播过程.

A new device system was developed to measure the pulsed temperature and vapor concentration in the exhaust flow during the multicycle process of pulsed detonation engine. The experiment results show every pulsed temperature canbe captured and a heat imaging device was uesed to calibrate the temperature mesaured by the new deivce. The paper uses the third order upwind scheme with TVD property and the Strang-splitting method to carry out the 2-D simulation of C3H8/O2 detonation with one step chemical mechanism. The simulation results were proved that this method can capture the ignition and propagation of detonation.