关键词: 固体燃料冲压发动机;旋流燃烧;直连式试验+;燃速

Abstract: In order to study the swirl combustion characteristics of solid fuel ramjet,direct/swirl flow contrast experiments were conducted on a direct-connected pipe test bed.The solid fuel contained 65% metal powder based on HTPB.The initial port diameter of the solid fuel was 40 mm,and the length was 180 mm.An ethanol/oxygen spark torch igniter was used for the ignition of solid fuel.Inlet air was heated up to 690 K,and oxygen was mixed with air to ensure that the vitiated air contained 23% oxygen.The flux of the vitiated hot air was about 300 g/s.The pressure and thrust were measured.A video was used to record the tail flame,and the mean solid fuel regression rate was calculated.The flam was stable without inserting the swirler into the combustion chamber.The swirl flow combustion performed better stabilization than the direct flow,and the mean solid fuel regression rate was nearly 50% higher than the direct flow.The tail flame expanded in the radial direction.This indicated that the combustion products still existed tangential velocity,which caused thrust loss.

Key words: Solid fueled ramjet(SFRJ);Swirl combustion;Direct-connected-pipe test+;Burning rate