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首页> 外文期刊>Aerospace science and technology >Experimental and numerical investigation of a new active control method to suppression of vortex shedding and reduction of sound pressure level of a circular cylinder
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Experimental and numerical investigation of a new active control method to suppression of vortex shedding and reduction of sound pressure level of a circular cylinder

机译：新型活性控制方法对旋转旋转的实验和数值研究，减少圆筒的声压水平

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摘要

The reduction of sound pressure level (SPL) induced by the fluid flow is one of the central factors in the modern aerodynamic designs. In the present study, the aerodynamic specifications of the flow over a cylinder with specific diameter and length were numerically and experimentally investigated in different conditions. The experiments were performed in a wind tunnel for various operating conditions, and an in-house OpenFoam multiphase-acoustic solver was applied for numerical investigation. The present study aimed at forming a relationship between SPL propagation and water injection as a modern active control method to decrease flow SPL. Curl's acoustic analogy was used in the applied solver alongside the k-omega SST turbulence model. Also, the simulation results were validated against experimental data. Both numerical and experimental results indicated the key role of water injection in the reduction of the SPL propagation. Furthermore, the results revealed that the mass flow rate ratio of the water injection to the inlet flow of 36 was an optimum state for the SPL reduction. In the next stage, different angles of water injection were investigated, revealing that the water injection angle of 60 degrees caused a dramatic decrease in the SPL propagation. (C) 2020 Elsevier Masson SAS. All rights reserved.
机译：流体流动诱导的声压级（SPL）的减少是现代空气动力学设计中的中心因素之一。在本研究中，在不同条件下进行数值和实验研究流动在圆柱体上的流动的空气动力学规格。实验在风隧道中进行，用于各种操作条件，并施加内部OpenFoam多相 - 声学求解器以进行数值调查。本研究旨在在SPL繁殖和水注入之间形成一种现代主动控制方法，以减少流动分析。卷曲的声学类比在k-Omega SST湍流模型旁边的应用求解器中使用。此外，模拟结果针对实验数据验证。数值和实验结果表明了注水在SPL繁殖的减少中的关键作用。此外，结果表明，36的入口流的水注射的质量流量比为SPL减少的最佳状态。在下一阶段，研究了不同的水注射角度，揭示了60度的水注射角导致SPL传播中的显着降低。 （c）2020 Elsevier Masson SAS。版权所有。

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