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弹道学报  2015 

旋转爆轰发动机燃烧室掺混特性数值研究

Keywords: 流体力学,旋转爆轰发动机,掺混,喷注,数值仿真

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Abstract:

为探索旋转爆轰发动机燃烧室内气体射流冷流掺混的情况,采用高精度高分辨率迎风通量分裂格式(AUSMPW+),求解三维欧拉方程。以环缝/小孔喷注方式的发动机模型为基础,在保证当量比不变情况下,分析了燃料喷注位置、喷注角度、单侧孔或双侧孔喷注、入口总压及出口反压对冷流掺混效果的影响。研究结果表明:随着H2喷注位置的前移,掺混效果有明显提高;喷注角度的改变对H2/Air的掺混效果有很大的影响;顺喷的掺混均匀度变化幅度较大,在燃烧室的头部,顺喷的掺混效果比垂直喷注和逆喷差,在燃烧室尾部的掺混效果优于其他2种;对单侧孔或双侧孔喷注而言,双侧孔喷注方式的掺混效果明显高于单侧孔喷注方式;掺混效果与入口总压成反比,与出口反压成正比。

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