Mathelin L, Bataille F, Lallemand A
Institut National des Sciences Appliquées de Lyon Centre de Thermique de Lyon, UMR 5008 Bât. 404, 20 av. A. Einstein, 69621 Villeurbanne, France.
Ann N Y Acad Sci. 2001 May;934:385-92. doi: 10.1111/j.1749-6632.2001.tb05874.x.
To protect surfaces against high temperatures, the blowing through a porous material is studied. The geometry is that of a circular cylinder in cross-flow and the effectiveness of the blowing for the thermal protection is numerically investigated. Two models are developed for the blowing simulation and comparisons are made with experimental data obtained in a heated wind-tunnel. It is shown that the blowing strongly affects the dynamical and thermal profiles over the surface, thickening the boundary layers and decreasing the external transfer coefficients. It results in a lower viscous drag and thermal stress. The wall temperature dramatically decreases with blowing and the heat flux is also affected.
为了保护表面免受高温影响，对通过多孔材料的吹气进行了研究。几何形状为横流中的圆柱体，并对吹气用于热保护的有效性进行了数值研究。开发了两种用于吹气模拟的模型，并与在加热风洞中获得的实验数据进行了比较。结果表明，吹气强烈影响表面上的动力学和热剖面，使边界层增厚并降低外部传递系数。这导致较低的粘性阻力和热应力。随着吹气，壁温显著降低，热通量也受到影响。
