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The Effects of Surfaces on the Aerodynamics and Acoustics of Jet Flows

机译:表面对射流的空气动力学和声学的影响

摘要

Aircraft noise mitigation is an ongoing challenge for the aeronautics research community. In response to this challenge, low-noise aircraft concepts have been developed that exhibit situations where the jet exhaust interacts with an airframe surface. Jet flows interacting with nearby surfaces manifest a complex behavior in which acoustic and aerodynamic characteristics are altered. In this paper, the variation of the aerodynamics, acoustic source, and far-field acoustic intensity are examined as a large at plate is positioned relative to the nozzle exit. Steady Reynolds-Averaged Navier-Stokes solutions are examined to study the aerodynamic changes in the field-variables and turbulence statistics. The mixing noise model of Tam and Auriault is used to predict the noise produced by the jet. To validate both the aerodynamic and the noise prediction models, results are compared with Particle Image Velocimetry (PIV) and free-field acoustic data respectively. The variation of the aerodynamic quantities and noise source are examined by comparing predictions from various jet and at plate configurations with an isolated jet. To quantify the propulsion airframe aeroacoustic installation effects on the aerodynamic noise source, a non-dimensional number is formed that contains the flow-conditions and airframe installation parameters.
机译:减轻飞机噪声对航空研究界是一个持续的挑战。为了应对这一挑战,已经开发出低噪声的飞机概念,这些概念展示了喷气发动机排气口与机身表面相互作用的情况。与附近表面相互作用的喷气流表现出复杂的行为,其中声学和空气动力特性发生了变化。在本文中,检查了空气动力学,声源和远场声强的变化,因为相对于喷嘴出口而言,较大的平板位于位置。研究了稳态雷诺平均Navier-Stokes解,以研究现场变量和湍流统计中的空气动力学变化。 Tam和Auriault的混合噪声模型用于预测飞机产生的噪声。为了验证空气动力学模型和噪声预测模型,将结果分别与粒子图像测速(PIV)和自由场声学数据进行了比较。通过比较来自各种射流的预测和在板构型下与孤立射流的比较,来检验空气动力学量和噪声源的变化。为了量化推进飞机的空气声学安装对空气动力噪声源的影响,形成了一个无量纲的数字,其中包含了流动条件和机身的安装参数。

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