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首页> 外文期刊>Transactions of the Japan society for aeronautical and space sciences >Numerical Analysis of Flow through a Hole for Modeling of Wind Tunnel Porous Wall
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Numerical Analysis of Flow through a Hole for Modeling of Wind Tunnel Porous Wall

机译：风洞多孔壁数值模拟的孔流数值分析

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摘要

To model porous walls used in transonic wind tunnels, flow through a hole is investigated using Computational Fluid Dynamics (CFD). First, we analyze the relation between flow rate and differential pressure across the hole. At low differential pressures, such as for wind tunnel porous walls, the flow rate is found to increase linearly with differential pressure. We therefore propose a new model based on a linear relationship between flow rate and differential pressure. The effects of hole shape and boundary layer conditions near the hole are then investigated. In the outflow case (i.e., wind tunnel to plenum chamber), the flow rate increases as the ratio of hole depth to diameter becomes large due to variation of the flow separation area at the hole exit. Boundary layer thickness also affects the flow field: when the ratio of boundary layer thickness to hole diameter becomes small, the flow rate decreases, because the flow along wind tunnel side wall interacts more strongly with the flow through the hole.
机译：为了对跨音速风洞中使用的多孔壁进行建模，使用计算流体动力学（CFD）研究了通过孔的流动。首先，我们分析流量与整个孔内压差之间的关系。在低压差下，例如风洞多孔壁，流量随压差线性增加。因此，我们提出了一种基于流量与压差之间线性关系的新模型。然后研究孔的形状和孔附近边界层条件的影响。在流出情况下（即，风洞到增压室），由于孔出口处的流动分离面积的变化，孔的深度与直径的比变大，流量增加。边界层厚度也会影响流场：当边界层厚度与孔直径的比率变小时，流速会降低，因为沿风洞侧壁的流动与穿过孔的流动相互作用更强。

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