Boundary layer separation due to gas thermal expansion
Boundary layer separation due to gas thermal expansion
复制标题
由于气体热膨胀引起的边界层分离
DOI：
10.1063/1.869397
复制
发表时间：
1997
影响因子：
4.6
通讯作者：
F. Higuera
中科院分区：
文献类型：
--
作者：
F. Higuera
对由于平板上层流边界层中气体的热膨胀而产生的粘性-非粘性相互作用进行了分析，平板上的温度在其前缘的有限距离处呈现出高于环境温度的阶梯式升高。无限大雷诺数的三层问题的数值解表明，边界层在板与气体温度之比的临界值处分离，取决于普朗特数和气体粘度的温度敏感性（假设其随着温度的幂而增加）。当温度比增加到该值以上时，分离点不断移动到温度步骤的上游，而重新附着发生在温度步骤的下游不久，从而形成三角形的再循环气泡。给出了初始分离流动的渐近描述。对于非常大的温度比值，冷热之间会形成清晰的界面......
An analysis is carried out of the viscous-inviscid interaction due to the thermal expansion of the gas in the laminar boundary layer over a flat plate whose temperature presents a step elevation above the ambient temperature at a finite distance of its leading edge. Numerical solution of the triple-deck problem for infinitely large Reynolds numbers shows that the boundary layer separates for a critical value of the ratio of plate-to-gas temperature, dependent on the Prandtl number and the temperature sensitivity of the gas viscosity (which is assumed to increase as a power of the temperature). As the temperature ratio increases above this value, the separation point continuously shifts upstream of the temperature step whereas reattachment occurs shortly downstream of the step, leading to a triangle shaped recirculation bubble. An asymptotic description is given of the flow with incipient separation. For very large values of the temperature ratio a neatly defined interface develops between the cold and hot...