This paper aims at investigating a two-dimensional flow over the rod-airfoil as a simple component of an aircraft using URANS equations. The prediction of the flow-induced noise is performed using F-WH analogy. Since Vortex’s periodic production is the main cause of the noise mechanism, by reducing its effect on the airfoil leading edge, the acoustic propagation reduces as well. To control flow and reduce noise, in this study, the suction and blowing active control method is employed (blowing in the rod, and simultaneous suction and blowing in the airfoil). The range of changes in the intensity (I) of the suction and blowing is (0.1U–0.5U), where [Formula: see text] is the rate of free streamflow. The acoustic study showed that the noise is decreased at [Formula: see text] and [Formula: see text] by 55% and 70%, which is due to the suppression and alleviation of vortices. In addition, by using blowing and suction, the lift force is increased and the drag force is decreased, which is aerodynamically favorable. Strouhal number estimation showed that this parameter was reduced by this control method.

中文翻译：

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使用吸吹控制方法降低杆翼型的气动噪声

本文旨在使用 URANS 方程研究作为飞机简单组件的杆翼型上的二维流动。使用 F-WH 类比来执行流动引起的噪声的预测。由于涡流的周期性产生是噪声机制的主要原因，通过减少其对翼型前缘的影响，声传播也减少了。为了控制流量和降低噪声，本研究采用了吸吹主动控制方法（杆内吹气，翼型同时吸吹和吹气）。吸吹强度（I）的变化范围为（0.1U-0.5U），其中[公式：见正文]为自由流率。声学研究表明，[公式：见文本]和[公式：见文本]处的噪声降低了 55% 和 70%，这是由于涡流的抑制和减轻。此外，通过吹吸，提高升力，降低阻力，在空气动力学上是有利的。斯特劳哈尔数估计表明，这种控制方法降低了该参数。