A321 粗壁面に対する乱流モデルの提案

概要

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The effects of surface roughness on the aerodynamic performance of an airfoil are very interesting and also important in industries. Conventionally, the effects have been treated, by using the wall function for a rough wall in a high -Re-number-type model, or by modifying model coefficients with roughness parameters in a low -Re-number-type one. However, since such treatments were developed for uniformly distributed roughness, the availability would be limited under a certain flow and roughness conditions. Considering an airfoil surface with ice accretion or foreign object damage, the roughness is isolated or local. Therefore, it is needed to develop a more universal procedure or a turbulence model to calculate the flow field around an airf oil with various types of surface roughness. In the present study, we develop a more universal turbulence model for a rough wall. The model is verified for the 2D asymmetric channel flow with a smooth and a rough wall. Next, to clear the model performance, we apply it to the flow fields around a single airfoil with different attack angles and Mach numbers. The effects of roughness on the aerodynamic performance such as static pressure coefficient, lift and so on are investigated numerically.
日本流体力学会の論文
2002-07-23