确定通风部件压力损失系数的计算流体动力学模拟的验证

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
K. Tawackolian, M. Kriegel
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引用次数: 0

摘要

通风系统包括各种组件,这些组件通常无法获得必要的压力损失数据。计算流体动力学模拟可以代替昂贵的测量,但具有适当数据的验证模拟对于评估模型的不确定性至关重要。现有的CFD验证研究要么没有专门关注压力损失,只涵盖了少数组件,要么没有包括湍流建模的最新发展。在本工作中,使用一致的方法模拟了33个弯头、4个闸门和2个三通。计算流体动力学模拟用已发表的数据进行了验证:Sprenger实验数据集中的矩形高边和宽边弯曲,SMACMA指南中的闸门和分叉三通。所考虑的流动包括重要的基本流动现象:偏转、分流和流分离。用三个雷诺数为14的湍流模型对39个分量进行了模拟。模拟准确地预测了各种部件的压力损失系数。具有强流分离区域的情况最具挑战性。通过对三个选定的湍流模型进行模拟来评估模型预测的不确定性。与Sprenger的实验数据一样,模拟显示,弯管的压力损失系数明显依赖于雷诺数。相反,对于锐边处的突然偏转和流分离,雷诺数的依赖性很小。实际应用通风系统的尺寸、优化和能量评估需要管道系统组件的技术压力损失数据。本验证研究评估了CFD模拟的现状,以确定压力损失系数和由此产生的预测不确定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Validation of computational fluid dynamics simulations for determining pressure loss coefficients of ventilation components
Ventilation systems include a variety of components for which necessary pressure loss data is often unavailable. Computational fluid dynamics simulations could substitute for expensive measurements, but validation simulations with suitable data are crucial to assess model uncertainties. Existing CFD validation studies either did not focus specifically on pressure losses, only covered few components, or did not include recent developments in turbulence modelling. In the present work, 33 bends, 4 gates and 2 tees were simulated using a consistent approach. Computational fluid dynamics simulations were validated with published data: rectangular high-edge and wide-edge bends from the experimental dataset of Sprenger, gates and diverging tees from the SMACMA guide. The considered flows cover important basic flow phenomena: deflection, splitting and flow separation. The 39 components were simulated with three turbulence models at 14 Reynolds numbers. The simulations predicted pressure loss coefficients accurately for various components. Cases with strong flow separation regions were most challenging. The model prediction uncertainty was assessed by carrying out simulations with three selected turbulence models. As in the experimental data from Sprenger, the simulations showed a distinct dependence of pressure loss coefficients on the Reynolds number for bends. In contrast, for abrupt deflections and flow separation at sharp edges, the Reynolds number dependency was minor. Practical Application Technical pressure loss data of ductwork components is needed for the dimensioning, optimisation, and energy assessment of ventilation systems. The present validation study assesses the present state of the art of CFD simulations to determine pressure loss coefficients and the resulting prediction uncertainties.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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