Grzelak Joanna, Szwaba Ryszard
Faculty of Mechanical Engineering and Ship Technology, Gdansk University of Technology, 11/12 Narutowicza, 80-233 Gdansk, Poland.
Institute of Fluid Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdansk, Poland.
Materials (Basel). 2021 Nov 3;14(21):6624. doi: 10.3390/ma14216624.
Transpiration flow is a very important and still open subject in many technical applications. Perforated walls are useful for the purpose of "flow control", as well as for the cooling of walls and blades (effusive cooling) in gas turbines. We are still not able to include large numbers of holes in the numerical calculations and therefore we need physical models. Problems are related also to the quality of the holes in perforated plates. The present transpiration analysis concerns with experimental investigations of the air flow through perforated plates with microholes of 125 and 300 µm diameters. A good accordance of the results with other experiments, simulations and theory was obtained. The received results very clearly show that technology manufacturing of plate holes influences on their aerodynamic characteristics. It turned out that the quality of the plate microholes using laser technology and, consequently, the shape of the hole, can affect the flow losses. Therefore, this effect was investigated and the flow characteristics in both directions were measured, i.e., for two plate settings.
在许多技术应用中，发汗流动是一个非常重要且仍未解决的课题。多孔壁对于“流量控制”以及燃气轮机中壁面和叶片的冷却（发散冷却）很有用。我们仍然无法在数值计算中纳入大量的孔，因此我们需要物理模型。问题还与多孔板上孔的质量有关。目前的发汗分析涉及对通过直径为125微米和300微米微孔的多孔板的气流进行实验研究。实验结果与其他实验、模拟和理论结果吻合良好。所得到的结果非常清楚地表明，板孔的制造工艺会影响其气动特性。结果表明，使用激光技术制造的板微孔质量，进而孔的形状，会影响流动损失。因此，对这种影响进行了研究，并测量了两个方向上的流动特性，即针对两种板的设置情况。
