含化学热沉的气膜冷却流动与换热研究

Research on Fluid Flow and Heat Transfer of Film Cooling With Chemical Heat Transfer

为了进一步提高涡轮入口温度,提出一种新型气膜冷却方法~含化学热沉的气膜冷却方法。对于新方法来讲,化学热沉的存在会影响气膜孔下游的流场,从而影响主流与固体壁面的换热。建立简化理想化学热沉模型,采用标准k-ε湍流模型对该方法进行数值模拟,结果表明,化学热沉的存在降低了气膜孔出口下游不远处壁面附近的温度,同时增大了壁面处混合气膜与壁面之间的对流换热系数.

In order to improving the turbine inlet temperature,a novel film cooling method ?film cooling with chemical heat sink was proposed.For the novel method,the film flow structure downstream of the film hole was affected by the chemical heat sink,and therefore the heat transfer between the mainstream and the surface was changed.A simple ideal model with chemical heat sink was built,and the novel film cooling with chemical heat sink was simulated by using the standard k-e turbulent model.The results show that the surface temperature downstream of the film hole is lower by the chemical heat sink,and the heat transfer coefficient between the film and the surface is improved at the same time.