The interest in transpiration flows through perforated walls is recently increasing again because the manufacturing of such walls is much easier than in former decades. Recently the interest is related to laminar wing technology and effusive cooling in aeroengines. Transpiration flows become useful also for other applications as reduction of separation and other flow control devices as passive shock wave boundary layer control.

Plates perforation used for the mentioned above flow control application is rather low at the level below 10%. In order to minimize the flow disturbance small hole diameters are used, well below 1 mm. This means that there is a large number of holes, which cannot be directly included in the numerical simulations. Therefore physical model is still necessary to serve as boundary condition at perforated wall. Several models have been offered formerly with limited success.

In the present paper a new model is proposed, which is able to incorporate whole pressure drop range from weak pressure differences to chocking conditions. To create and verify the model experimental investigations as well numerical simulations were taken into account. As the quality of holes has important impact on the plate aerodynamic performance, the model introduces plate effectiveness coefficient. This coefficient allows to take into account perforation quality.

通过多孔壁蒸腾的兴趣最近再次增加，因为这种壁的制造比过去几十年要容易得多。近来，人们的兴趣与航空发动机中的层流机翼技术和高效冷却有关。蒸腾流对于减少分离和其他流控制设备（作为被动冲击波边界层控制）的其他应用也变得有用。

用于上述流动控制应用的板穿孔相当低，低于10％。为了使流动干扰最小化，使用了小孔直径，该直径远小于1 mm。这意味着存在大量的孔，这些孔不能直接包含在数值模拟中。因此，仍然需要物理模型来作为穿孔壁的边界条件。以前已经提供了几种模型，但收效甚微。

在本文中，提出了一种新模型，该模型能够纳入从弱压差到阻塞条件的整个压降范围。为了创建和验证模型，考虑了实验研究以及数值模拟。由于孔的质量对板的空气动力学性能有重要影响，因此该模型引入了板的有效系数。该系数允许考虑穿孔质量。