煤油燃料宽域冲压旋转爆震燃烧特性

Rotating Detonation Combustion Characteristics of Kerosene-Fueled Wide-Area Scramjets

通过三维数值仿真的方法,研究了Ma=3~7飞行工况下,煤油燃料冲压旋转爆震燃烧特性。在Ma=3飞行工况下,由于燃料雾化蒸发效果较差,无法实现煤油燃料的爆震燃烧。Ma=4, 5, 6的飞行工况下,随着飞行Mach数的增大,波头数目整体上逐渐增多,分别为单波、三波、五波模态;但传播速度逐渐减小;冲压模态下,液态燃料雾化蒸发效果较好,但流场内均不同程度地残存有煤油蒸气,其未参加反应便排出燃烧室。Ma=7的飞行工况下,由于来流接近CJ速度,流场将以驻定爆震模态组织燃烧。

Through the method of three-dimensional numerical simulation,the rotating detonation combustion characteristics of kerosene-fueled scramjets in the range of Ma=3~7 were studied.In the flight condition of Ma=3,due to the poor effect of fuel atomization and evaporation,the detonation combustion of kerosene fuel cannot be realized.In the flight conditions of Ma=4,5,6,with the increase of Mach number,the number of wave heads increases gradually,which are single-wave,three-wave,and five-wave modes,respectively.However,the propagation speed gradually decreases.In the scramjet mode,the liquid fuel has a good effect of atomization and evaporation.Nevertheless,kerosene vapor remains in the flow field to varying degrees and is discharged from the combustion chamber without participating in the reaction.In the flight condition of Ma=7,the flow field will burn in a stationary detonation mode because the incoming flow is close to CJ velocity.