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.