论文部分内容阅读
为了优化超燃冲压发动机燃料喷注系统,提高燃烧性能和发动机可靠性,基于串联凹腔燃烧室构型,对不同燃料喷射方式下液态煤油超声速燃烧进行了三维数值研究,着重分析了壁喷与环喷两种燃料喷射方式对燃烧室性能的影响,并与试验测得的壁面静压数据进行了对比。研究结果表明,环喷改善了掺混效果,使燃料在流道中分布均匀,使其燃烧效率比壁喷提高了4.36%;两种喷射方式下沿程总压损失基本相当,在出口处总压损失了约50%;在第二排喷点下游,环喷得到的CO2分布范围比壁喷大,且更均匀,体现了其促进燃烧的特性;环喷因燃料动压比较壁喷的小,故其燃料穿透深度比壁喷小。综合来看,建议在相同的燃料当量比下,选择壁喷方式,以简化燃料喷注系统,提高发动机的可靠性。
In order to optimize the fuel injection system of the scramjet and improve the combustion performance and engine reliability, a three-dimensional numerical study on the supersonic combustion of the liquid kerosene under different fuel injection modes is carried out based on the configuration of the tandem cavity combustion chamber. The influence of two kinds of fuel injection modes on the performance of the combustion chamber was compared with that of the measured wall static pressure data. The results show that the annular injection improves the blending effect and distributes the fuel uniformly in the flow channel, resulting in a combustion efficiency 4.36% higher than that of the wall injection. The total pressure loss along the two injection modes is basically the same, and the total pressure at the outlet The loss of about 50%; downstream of the second row of spray points, annular spray CO2 distribution range larger than the wall spray, and more uniform, reflecting its combustion characteristics; ring jet fuel dynamic pressure is smaller wall spray, Therefore, the penetration depth of the fuel spray wall is small. Taken together, it is suggested that the wall injection method should be selected at the same fuel equivalence ratio to simplify the fuel injection system and improve the reliability of the engine.