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

Abstract

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. Keywords: Film cooling, Hypersonic vehicle, Space technology, Numerical simulation, Cooling efficiency