Abstract: Numerical simulations are performed to investigate and analyze the relationship between the combustion efficiency and the configuration of a trapped vortex combustor (TVC), of which combustion partially occurs in the external tunnel according to the experimental observation. Using the moving particle semi-implicit (MPS) method, simulation results qualitatively represent the fuel splashing phenomena, and thus indicate the defects in the original design of the fuel evaporation tube. Thereafter, the structure of the evaporation tube is optimized. In case of the new TVC configuration, MPS simulations find the number of the splashing particles reduce from 50% to 10%. Meanwhile, the experimental results reflect the combustion efficiency increase from 50% to 80%~90% accordingly. The optimization design for TVC is thus validated.

Key words: Aircraft engine; Moving particle semi-implicit method; Trapped vortex combustor; Evaporation tube

摘要： 采用数值模拟方法研究在驻涡燃烧室试验中出现的部分燃油在外环冷却腔中燃烧的现象,分析导致过低的燃烧效率的原因,并通过优化设计对此现象加以解决。通过移动粒子半隐式方法的计算,结果基本还原了燃油回溅现象,查找出蒸发管结构设计中直段长度过短,并对蒸发管直段结构进行优化加长。在结构优化后的计算中,燃油回溅现象已经得到了很好的抑制,计算溅出的粒子由总数的50%降低至10%左右；试验结果得到的温升法燃烧效率也相应的由50%左右上升至80%~90%,从而验证了优化设计的正确性。

关键词: 航空发动机;移动粒子法;驻涡燃烧室;蒸发管