液体火箭贮箱出流口防塌陷仿真分析

Simulation Analysis for Propellant Collapse Defense in Tank Outlet of Liquid Rocket

为了分析防塌陷装置的效果及影响,采用流体动力学软件Flow3D开展液体火箭贮箱出流口防塌陷仿真研究。仿真结果表明,倒锥防塌陷装置通过减小中心区域与近壁区域的速度差,可以有效延迟发动机工作末期出流口塌陷夹气的出现;倒锥位于箱底的位置显著影响防塌陷效果,随着倒锥装置上移防塌陷效果逐渐降低,但同时会使局部最低静压升高,有利于防空化设计,设计中需要综合考虑防塌陷和防空化要求选择合适的倒锥高度;通过仿真模型验证了地面缩比试验模拟飞行工况的有效性。

In order to obtain the effect and influence of the anti-collapse device,simulation studies for propellant collapse defense in tank outlet of liquid rocket are carried out based on the software Flow3D.The simulation results show that the inverted anti-collapse device can effectively delay the collapse flow in the tank outlet by reducing the speed difference between the central flow region and near-wall region.The height of anti-collapse device location significantly influence the effect of preventing propellant collapse,of which the effect will be reduced when the height becomes higher.At the same time,higher location of the anti-collapse will cause higher local minimum pressure which is beneficial to the requirements of cavitation defense.Therefore,it is necessary to consider the requirements of collapse defense and cavitation defense simultaneously before choosing the value of anti-collapse device height.The validity of ground scaling test is verified by the simulation model.