圆形和方形前缘板上的非定常流动和传热特性

Q3 Engineering
Channarong Wantha
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引用次数: 0

摘要

数值研究了上游板前缘形状对定常层流向非定常流过渡区的影响,以及前缘的换热特性。计算采用有限体积法在低雷诺数条件下的二维区域进行。结果表明,在低雷诺数为114时,von Kármán旋涡脱落模式在圆形上游板后开始。当上游板前缘为方形时,在较高雷诺数400左右时,板发生流动分离,流动变得不稳定。当雷诺数在100 ~ 700之间时,对于方形前缘和圆形前缘,上游板的平均努塞尔数分别增加约179%和213%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Unsteady flow and heat transfer characteristics over the rounded and square leading-edge plate
The influences of the shape of the leading edge of the upstream plate on the transition region from steady laminar flow to unsteady flow, as well as the heat transfer from these leading edges, were numerically studied. The calculations were performed using the finite volume method in two-dimensional domains in a low Reynolds number regime with a constant incoming flow. The results show that von Kármán vortex shedding patterns start behind the rounded upstream plate at a low Reynolds number of 114. When the leading edge of the upstream plate is square, the plate experiences flow separation and the flow become unsteady at higher Reynolds numbers of around 400. The mean Nusselt number of the upstream plate increases by approximately 179% and 213% for square and rounded leading edges, respectively, for Reynolds numbers ranging from 100 to 700.
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