激波干扰支板射流混合增强规律

Mixing enhancement law of shock wave interfering struct jet

实现超声速来流和燃料射流在燃烧室内的快速混合一直是提升超燃冲压发动机性能亟待解决的关键问题之一。为了有效提升燃烧室内空气来流和燃料射流的混合效果,通过数值模拟的方法,在超声速来流和支板喷注的前提下,在燃烧室上壁面添加了斜坡型激波发生器,并通过改变斜坡型激波发生器的结构参数,包括角度(15°、20°、25°、30°),尺寸(5、10、15、20 mm),位置(100、110、120、130 mm处)等,以探究不同结构参数对混合效果的影响。研究结果表明:斜坡型激波发生器的引入能够有效地增强混合效果,且不同的结构参数对混合效果的影响也存在差异,斜坡型激波发生器尺寸的大小对混合效果的影响大于角度,斜坡型激波发生器角度的大小对混合效果的影响大于位置;混合效率和总压恢复系数成负相关关系。

Realizing the rapid mixing of supersonic incoming flow and fuel jet in the combustion chamber is one of the key problems to be solved for improving the performance of scramjet.In order to effectively improve the mixing effect of air inflow and fuel jet in the combustion chamber,a ramp shock generator was added to the upper wall of the combustion chamber through numerical simulation on the premise of supersonic inflow and strut injection,and the structural parameters of the ramp shock generator are changed,including angles(15°,20°,25°,30°),dimensions(5,10,15,20 mm)and location(100,110,120,130 mm)to explore the influence of different structural parameters on the mixing effect.The results show that the introduction of the ramp shock generator can effectively enhance the mixing effect,and different structural parameters have different effects on the mixing effect.The size of the ramp shock generator has more influence on the mixing effect than the angle,and the angle of the ramp shock generator has more influence on the mixing effect than the position.At the same time,the mixing efficiency and the total pressure recovery coefficient are negatively correlated.