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Computational aeroacoustic characterization of different orifice geometries under grazing flow conditions

机译:掠流条件下不同孔口几何形状的计算空气声特性

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摘要

This paper deals with the numerical prediction of the aeroacoustic behavior of orifices under grazing flow conditions. A hybrid computational aeroacoustics approach is adopted where the steady, incompressible, mean flow over the orifice is obtained from a RANS simulation. In a next step, the mean flow variables are used to solve the linearized Navier–Stokes equations (LNSE), using a Runge–Kutta Discontinuous Galerkin (RKDG) method. In this way, the linear interaction mechanisms between the aerodynamic and acoustic fluctuations are studied which enables an aeroacoustic characterization of the orifice. A methodology is presented involving a virtual impedance tube and two computations for each geometrical configuration: one with the presence of a mean flow and one for a quiescent medium. This allows to isolate the contribution of the mean flow to the orifice impedance. The method is verified against theoretical models and experimental data from literature, and is used to study the influence of orifice geometry variations, such as the orifice length, the plate thickness and the edge rounding, on the mean flow contribution to the impedance.
机译:本文研究了掠流条件下孔口空气声行为的数值预测。采用混合计算航空声学方法,其中通过RANS模拟获得流过孔口的稳定,不可压缩的平均流量。下一步,使用Runge-Kutta间断Galerkin(RKDG)方法,将平均流量变量用于求解线性化的Navier-Stokes方程(LNSE)。以这种方式,研究了空气动力学和声学波动之间的线性相互作用机制,这使得能够对孔进行空气声学表征。提出了一种方法,包括虚拟阻抗管和每种几何配置的两种计算方法:一种具有平均流量,一种用于静态介质。这允许隔离平均流量对孔口阻抗的贡献。该方法已针对理论模型和来自文献的实验数据进行了验证,并用于研究孔口几何形状变化(例如孔口长度,板厚和边缘倒圆)对平均流量对阻抗的影响。

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