基于DPM的试验台导流槽喷水冷却数值研究

采用计算流体动力学(CFD)技术,对某型运载火箭动力系统试验时导流槽的热环境进行了分析。计算采用氢氧(H-O)单步燃烧反应模型,标准k-ε湍流模型获得燃烧流场,并采用离散相模型(DPM)模拟了试验台的喷水降噪系统和导流槽底部喷水冷却系统。随后,用经过校验的模型对某型号发动机试验台导流槽的设计参数进行了对比研究。结果表明:试验台的喷水降噪系统及导流槽底部的喷水冷却系统均对导流槽底部有冷却效果,两者同时工作时对导流槽底部的冷却有叠加增强效果；导流槽深度加大时或者喷水量加大时会对底部热环境的改善同样有增强作用。 

Numerical investigations of water-spray cooling effect on test stands deflector based on DPMA

Numerical investigations of a large launch vehicles stage test were conducted by computational fluid dynamics(CFD) technique. The uni-step hydrogen-oxygen(H-O) reaction model and standard k- turbulence model were employed to obtain the flow field, and discrete phase model(DPM) was used to simulate the water-spray system of test stand. Subsequently, the design parameters of a test stand were studied and compared. Results showed that DPM could simulate the water-spray system effectively, both of the noise suppressor system and water cooling system could improve the heat circumstance of flame-deflector, offering an enhanced effect when working together. The similar enhanced effect would be offered with the increase of the depth of deflector or the amount of water.