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首页> 外文期刊>International Journal of Heat and Mass Transfer >An equilibrium wall model for reacting turbulent flows with heat transfer
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An equilibrium wall model for reacting turbulent flows with heat transfer

机译：湍流与传热反应的平衡壁模型

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摘要

A wall model for reacting turbulent flows for predicting heat transfer in rocket engine combustion chambers is presented. The wall model is developed based on boundary layer equations and includes the effects of chemical reactions and variable properties. Assuming an equilibrium state near the wall, a simple set of momentum and enthalpy equation is formulated. A table look-up procedure is employed to calculate the contributions of chemical effects and mixture properties. For turbulence modeling of the inner layer, a modified mixing length model based on semi-local scaling is applied. The proposed equilibrium wall model is validated in two hydrogen/oxygen reacting cases. In the first validation case of a reacting turbulent channel flow, the equilibrium wall model accurately predicts the near-wall velocity and temperature fields. In contrast, the wall model when assuming frozen chemistry shows a discrepancy in temperature gradient and mixture properties. The heat flux balance in the equilibrium wall model highlights the important contributions of chemical effects. The second test case of a rocket combustion chamber shows that the equilibrium wall model is superior to the frozen wall model and wall function models in predicting wall shear stress and heat flux. (C) 2019 Elsevier Ltd. All rights reserved.
机译：提出了一种用于反应湍流以预测火箭发动机燃烧室中热传递的壁模型。墙模型是基于边界层方程开发的，包括化学反应和可变特性的影响。假设壁附近处于平衡状态，则公式化了一组简单的动量和焓方程。使用查表程序来计算化学作用和混合物性质的贡献。对于内层的湍流建模，应用了基于半局部缩放的改进混合长度模型。所提出的平衡壁模型在两种氢/氧反应情况下得到了验证。在湍流通道反作用的第一种验证情况下，平衡壁模型可准确预测近壁速度和温度场。相反，当采用冻结化学方法时，壁模型显示出温度梯度和混合物性质的差异。平衡壁模型中的热通量平衡突出了化学效应的重要贡献。火箭燃烧室的第二个测试案例表明，在预测壁切应力和热通量方面，平衡壁模型优于冻结壁模型和壁函数模型。 （C）2019 Elsevier Ltd.保留所有权利。

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