亚燃冲压发动机中凹腔与V槽火焰稳定器性能对比分析

通过亚燃冲压发动机直连式试验和数值计算,对凹腔火焰稳定器及V槽火焰稳定器的点火性能和燃烧性能进行了初步研究.结果表明,凹腔火焰稳定器可以直接用高能火花塞点燃,而V槽火焰稳定器只能用氢气引导火焰点燃;火焰稳定方式与燃料的喷注方式相对应,中心喷注方式适用于V槽火焰稳定器,壁面或者贴近壁面的喷注方式适用于凹腔火焰稳定器.燃烧性能方面,凹腔属于边区组织燃烧方式,V槽火焰稳定器属于中心组织燃烧方式,更有利于已燃气体和未燃气体的混合.凹腔与V槽的燃烧效率较为相近,但V槽火焰稳定器具有较高的总压损失.

Comparison of characteristics of ramjet with cavity-based flameholder and V-gutter flameholder

Experimental research and numerical simulation were carried out in order to study the characteristics of cavity-based flameholder and V-gutter flameholder in liquid hydrocarbon fuel ramjet.The results suggest that flameholder based on cavity could be ignited by high-energy spark igniter or hydrogen pilot flame,but flameholder based on V-gutter could only be ignited by hydrogen pilot flame.Also,the fuel injection mode was closely related to the flame holding mode.Central injection was applied to V-gutter and wall or near-wall injection applied to cavity.The combustion of ramjet with cavity was organized in the near-wall area but that of V-gutter organized in the central area,making it helpful to the mixing of the unburned and the burned.The combustion efficiencies of cavity and V-gutter were very close to each other,but the pressure loss of V-gutter was a little higher.