Three-Dimensional Numerical Investigation on Structure and Radial Variation of Rotating Detonation Flow Field
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摘要: 基于带化学反应的三维Euler方程, 采用8组元和24个可逆化学反应的基元反应模型，对等当量比的气相氢气/氧气系统在圆环形燃烧室内的旋转爆轰进行了数值模拟。结果表明，子爆轰波、斜激波和滑移线组成了旋转爆轰波的基本三维结构。由于旋转爆轰燃烧室特殊的几何构型，即内壁的发散和外壁的收敛，使内壁面附近的爆轰强度要小于外壁面附近的爆轰强度，最终实现旋转爆轰波在燃烧室内的自持传播。Abstract: Based on three-dimensional Euler equation and elementary reaction model of hydrogen/oxygen system which includes 8 species and 48 elementary reactions, the rotating detonation in the annular combustor was simulated numerically.The basic three-dimensional structure of the rotating detonation consists of detonation wavelet, oblique shock wave and slip line.Due to the special geometric configuration of rotating detonation combustion, the detonation strength near the inner wall is weaker than that near the outer wall, and the rotating detonation can propagate self-sustainingly finally.
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图 5 旋转爆轰波的二维流场结构(x=0.7l0)
Figure 5. Two-dimensional steady flow field structure of the rotating detonation
图 6 t=917 μs时刻旋转爆轰燃烧室流场的温度分布云图
Figure 6. Temperature contour of the rotating detonation at t=917 μs
图 7 t=917 μs时刻旋转爆轰压力场的剖面图
Figure 7. Pressure distribution on inner, middle and outer laterals at t=917 μs
图 8 t=917 μs时刻旋转爆轰流场的温度分布图
Figure 8. Temperature distribution on inner, middle and outer laterals at t=917 μs
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