Interpretation of gas-film cooling against aero-thermal heating for high-speed vehicles
Interpretation of gas-film cooling against aero-thermal heating for high-speed vehicles
复制标题
高速车辆气膜冷却与气动热加热的解读
DOI：
10.1007/s10483-016-2144-8
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Dong Ming
中科院分区：
文献类型：
--
作者：
Dong Ming
讨论了薄膜冷却技术在应对高速飞行器表面气动热加热方面的可能应用。该技术已广泛应用于燃气轮机叶片的热防护。本文表明，将该技术应用于高速飞行器，其工作原理有根本的不同。对两个模型问题进行数值模拟以支持该论点。除了热保护之外，明显的减阻被发现是另一个有利的效果。对于第二个模型问题，即球锥上光学窗口的气体冷却，通过线性稳定性分析来研究薄膜的流体动力学不稳定性，以观察可能发生的层流-湍流转变。
The possible application of the film-cooling technique against aero-thermal heating for surfaces of high-speed flying vehicles is discussed. The technique has been widely used in the heat protection of gas turbine blades. It is shown in this paper that, by applying this technique to high-speed flying vehicles, the working principle is fundamentally different. Numerical simulations for two model problems are performed to support the argument. Besides the heat protection, the appreciable drag reduction is found to be another favorable effect. For the second model problem, i.e., the gas cooling for an optical window on a sphere cone, the hydrodynamic instability of the film is studied by the linear stability analysis to observe possible occurrence of laminar-turbulent transition.