摘要
为提高等离子体促进超声速横向射流掺混的效果,在1.6Ma来流条件下,采用数值仿真方法研究了脉冲电弧等离子体不同位置时,对超燃冲压发动机燃烧室内横向射流流场的影响,从流场结构、燃料穿透深度、燃料最大质量分数衰减程度、掺混效率等方面进行综合分析。结果表明,喷口附近不同位置的等离子体会对超声速流场产生不同影响,但均可在不同程度上提高燃料掺混效率。其中燃料喷口上游的等离子体可以促使燃料在展向上扩散,提升掺混效率约20.96%;横跨于喷口两侧的等离子体可以使燃料喷注形态由无等离子体时的“U”型改变为“水滴”型,掺混效率最大提高96.74%;燃料喷口下游的等离子体使燃料喷注形态由“U”型改变为“V”型,同时使燃料穿透深度提高19.07%,提升掺混效率44.48%。
In order to improve the effect of plasma on the mixing of supersonic transverse jets,numerical simulation methods were used to study the effects of different pulsed arc plasma positions on the transverse jet flow field in the scramjet combustor under the inflow condition of 1.6 Ma.Comprehensive analysis was carried out from aspects such as flow field structure,fuel penetration depth,maximum fuel mass fraction attenuation,and mixing efficiency.The results show that plasma at different locations near the nozzle has different effects on the supersonic flow field,but can improve the fuel mixing efficiency to varying degrees.Among them,the plasma upstream of the fuel nozzle can promote the fuel diffusion in the spanwise direction,improving the blending efficiency by about 20.96%;the plasma across both sides of the nozzle can change the fuel injection form the"U"shape without plasma to the"water drop"type,and the blending efficiency is increased by 96.74%;The plasma downstream of the fuel nozzle changes the fuel injection shape from a"U"shape to a"V"shape,while increasing the fuel penetration depth by 19.07%,and improving the blending efficiency by 44.48%.
作者
李修乾
张倩
车学科
李建阳
宁永建
LI Xiuqian;ZHANG Qian;CHE Xueke;LI Jianyang;NING Yongjian(Space Engineering University,Beijing 101416,China;Taiyuan Satellite Launch Center,Kelan Shanxi 036300,China)
基金
全国重点实验室(2024010101)。
