Two-dimensional film cooling over a flat plate in hypersonic flow

Film cooling, as one efficient active cooling method, will hopefully be used in ‘hypersonic vehicles’ in the future. The hypersonic vehicle׳s surface is more likely a flat plate than a blunt body, so the cooling characteristics of two-dimensional (2-D) film cooling over a flat plate in hypersonic flow are studied using both theoretical analysis and numerical methods. A cooling efficiency calculation formula under a hypersonic condition is obtained and the numerical results show that it has great predicting ability. Compared with the low-speed main-flow condition, several differences exist in the hypersonic main-flow condition. A parameter called the ‘generalized turbulent mixing coefficient’ is introduced and its approximate value range is given based on numerical results.