反压对等截面圆形隔离段传热的影响

Effect of Back Pressure on Heat Transfer inside the Constant-Area Round Isolator

中文关键词: 超燃冲压发动机  隔离段  激波串  传热

英文关键词: Scramjet  Isolator  Shock Trains  Heat Transfer

中文摘要:

      为了研究反压对等截面圆形隔离段传热的影响,使用FLUENT,考虑二维轴对称的基于密度基的求解器以及RNG双方程k-epsilon湍流模型,对二维等截面圆形隔离段流场进行了流固耦合数值模拟。在来流马赫数2条件下,通过改变不同的反压来研究反压对等截面圆形隔离段传热的影响。结果表明：反压产生的激波串使隔离段内附面层发生分离,减小了热阻,增大了热流密度,从而增加了与冷却液的换热量。当激波串全部进入隔离段时,高反压有助于提高冷却效果。

英文摘要:

      To investigate the effect of back pressure on heat transfer inside the constant-area round isolator. Numerical simulation of 2D isolators with round constant-area was performed with FLUENT, where we use the pressure based solver and the RNG k-epsilon turbulence model. As the Mach number of the inflow was 2, we change the back pressure to study the effect of back pressure on heat transfer inside the constant-area round isolator. The results show that：the shock trains generated by back pressure separate the boundary-layer, decrease the thermal resistance and increase the heat flow. It enhances the heat exchange with the coolant accordingly. When the shock trains ingress the isolator entirely, high back pressure redounds to improve the cooling performance.