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首页> 外文期刊>International Journal of Heat and Mass Transfer >Influence of boundary conditions on the structure of laminar boundary layer with hydrogen combustion on a permeable surface
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Influence of boundary conditions on the structure of laminar boundary layer with hydrogen combustion on a permeable surface

机译：渗透条件下氢燃烧对边界条件对层状边界层结构的影响

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摘要

A numerical study was performed to examine how thermal and diffusion boundary conditions affect the structure of laminar diffusion flame in air flow with porous blowing and combustion of hydrogen. Boundary conditions of two types were compared, with lengthwise-constant porous-wall temperature (T_W = const throughout the whole range of blowing ratios), and with lengthwise-constant temperature of the fuel supplied into the main flow (T' = const). With a liquid fuel having constant evaporating-sur-face temperature, we deal with boundary conditions of the first type. With a gas fuel, as a rule, we encounter the regime with T' = const. It is shown that, in spite of the significant difference in velocity and temperature profiles, in both cases the surface friction coefficients have close values. Also, it is found that the wall heat flux exhibits a maximum if considered as a function of fuel supply intensity. Nonetheless, the function of relative heat transfer monotonically decreases with blowing intensity, much like it does in non-reactive flow.
机译：进行了数值研究，以研究热和扩散边界条件如何影响多孔吹气和氢气燃烧气流中的层流扩散火焰的结构。比较了两种类型的边界条件，分别是纵向恒定的多孔壁温度（在整个吹风比范围内T_W =常数）和供应到主流中的燃料的纵向恒定温度（T'=常数）。对于具有恒定蒸发表面温度的液体燃料，我们处理第一类边界条件。通常，使用气体燃料时，我们会遇到T'= const的状态。结果表明，尽管速度和温度曲线存在显着差异，但在两种情况下，表面摩擦系数均具有接近的值。而且，发现如果考虑到燃料供应强度，则壁热通量表现出最大。但是，相对热传递的功能会随着吹气强度而单调降低，就像在非反应流中一样。

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