Performance of Aft-Ramp Cavities for Flame Stabilization in Supersonic Flows

THE fundamental and difficult-to-realize requirements of supersonic combustion needed in hypersonic airbreathing engine are ignition and flame holding. Cavities have gained the attention of scramjet community as a promising tool for ignition by creating a hot pool of radicals and for flame stabilization [1,2]. Experimental investigation conducted with supersonic reacting flow using open cavities showed that stable combustion can be achieved by optimizing the cavity dimensions [3]. Studies on the various aspects of flame-holder cavities highlighted the importance of cavity aft-wall ramp on the stability and flammability limits [4].