Large-Eddy Simulation of the Aerodynamic and Aeroacoustic Performance of a Ventilation Fan

Q2 Physics and Astronomy

Advances in Acoustics and Vibration Pub Date : 2013-03-27 DOI:10.1155/2013/876973

S. Bianchi, D. Borello, A. Corsini, F. Rispoli, A. G. Sheard

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引用次数: 1

Abstract

There are controversial requirements involved in developing numerical methodologies in order to compute the flow in industrial fans. The full resolution of turbulence spectrum in such high-Reynolds number flow configurations entails unreasonably expensive computational costs. The authors applied the study to a large unidirectional axial flow fan unit for tunnel ventilation to operate in the forward direction under ambient conditions. This delivered cooling air to the tunnel under routine operation, or hot gases at 400∘C under emergency conditions in the event of a tunnel fire. The simulations were carried out using the open source code OpenFOAM, within which they implemented a very large eddy simulation (VLES) based on one-equation SGS model to solve a transport equation for the modelled (subgrid) turbulent kinetic energy. This subgrid turbulence model improvement is a remedial strategy in VLES of high-Reynolds number industrial flows which are able to tackle the turbulence spectrum’s well-known insufficient resolution. The VLES of the industrial fan permits detecting the unsteady topology of the rotor flow. This paper explores the evolution of secondary flow phenomena and speculates on its influence on the actual load capability when operating at peak-pressure condition. Predicted noise emissions, in terms of sound pressure level spectra, are also compared with experimental results and found to agree within the uncertainty of the measurements.

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通风机气动与声学性能的大涡模拟

为了计算工业风机的流量，在开发数值方法时涉及到有争议的要求。在这种高雷诺数流动结构中，湍流谱的完全分辨率需要不合理的昂贵计算成本。将研究结果应用于某大型单向轴流风机机组，使其在环境条件下正向运行。它在隧道的日常运行中输送冷却空气，在隧道发生火灾的紧急情况下输送400°C的热气。模拟是使用开放源代码OpenFOAM进行的，其中他们基于单方程SGS模型实现了一个非常大的涡流模拟(VLES)，以求解模拟(子网格)湍流动能的输运方程。这种亚网格湍流模型的改进是高雷诺数工业流VLES中的一种补救策略，它能够解决众所周知的湍流谱分辨率不足的问题。工业风扇的VLES允许检测转子流动的非定常拓扑。本文探讨了峰压工况下二次流现象的演变，并推测了二次流现象对实际负荷能力的影响。在声压级谱方面，预测的噪声发射也与实验结果进行了比较，发现在测量的不确定度范围内是一致的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in Acoustics and Vibration ACOUSTICS-

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期刊介绍： The aim of Advances in Acoustics and Vibration is to act as a platform for dissemination of innovative and original research and development work in the area of acoustics and vibration. The target audience of the journal comprises both researchers and practitioners. Articles with innovative works of theoretical and/or experimental nature with research and/or application focus can be considered for publication in the journal. Articles submitted for publication in Advances in Acoustics and Vibration must neither have been published previously nor be under consideration elsewhere. Subject areas include (but are not limited to): Active, semi-active, passive and combined active-passive noise and vibration control Acoustic signal processing Aero-acoustics and aviation noise Architectural acoustics Audio acoustics, mechanisms of human hearing, musical acoustics Community and environmental acoustics and vibration Computational acoustics, numerical techniques Condition monitoring, health diagnostics, vibration testing, non-destructive testing Human response to sound and vibration, Occupational noise exposure and control Industrial, machinery, transportation noise and vibration Low, mid, and high frequency noise and vibration Materials for noise and vibration control Measurement and actuation techniques, sensors, actuators Modal analysis, statistical energy analysis, wavelet analysis, inverse methods Non-linear acoustics and vibration Sound and vibration sources, source localisation, sound propagation Underwater and ship acoustics Vibro-acoustics and shock.