发动机初级工况对冷却夹套隔片损伤影响分析

The Anylises of the Coolant Channel Ligaments' Damage to Engines' Primary-State

针对可重复使用液体火箭发动机推力室冷却夹套隔片的损伤问题,为确保发动机的工作寿命,对建立了冷却夹套隔片的夹芯梁结构模型、粘塑性模型和细化损伤模型,发动机起动过程中初级工况给冷却夹套隔片损伤发展的影响进行了仿真计算。结果表明:初级工况过高,压力等性能参数振荡明显,振幅也较大,但引起的冷却夹套隔片损伤较小;初级工况选择过低,引起的冷却夹套隔片损伤较大,且压力等性能参数振荡也比较明显,但振幅较小。通过对比分析给出了用于发动机起动的合适初级工况,采用此工况使发动机起动过程中引起的损伤较小,而且压力等性能参数的振荡也较小。

In the paper, damage of the coolant channel ligaments （ CCLs ） of thrust chamber for reusable liquid - propellant rocket engines was studied. The sandwich beam models, Freed Visco - plastic models and thinning models of the CCLs were founded first. Then the CCLs＇ s damage for the reusable liquild - propellant rocket engine＇ s pri- mary - state was simulated. The results show that high primary - state makes the parameters such as the pressure oscillate evidently, but bring less damage of the CCLs. On the contrary, the low primary - state brings the more damage, but the pressure will oscillate lightly. So a right scheme of startup for the engine is selected based on the comparison, which will bring less damage accumulation, and also make the pressures wave inconspicuous.