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首页> 外文期刊>Flow, turbulence and combustion >A Computational Fluid Dynamic Investigation of Inhomogeneous Hydrogen Flame Acceleration and Transition to Detonation
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A Computational Fluid Dynamic Investigation of Inhomogeneous Hydrogen Flame Acceleration and Transition to Detonation

机译：无均匀氢火焰加速度和爆炸过渡的计算流体动力学研究

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摘要

Gas explosions in homogeneous reactive mixtures have been widely studied both experimentally and numerically. However, in practice and industrial applications, combustible mixtures are usually inhomogeneous and subject to vertical concentration gradients. Limited studies have been conducted in such context which resulted in limited understanding of the explosion characteristics in such situations. The present numerical investigation aims to study the dynamics of Deflagration to Detonation Transition (DDT) in inhomogeneous hydrogen/air mixtures and examine the effects of obstacle blockage ratio in DDT. VCEFoam, a reactive density-based solver recently assembled by the authors within the frame of OpenFOAM CFD toolbox has been used. VCEFoam uses the Harten–Lax–van Leer–Contact (HLLC) scheme fr the convective fluxes contribution and shock capturing. The solver has been verified by comparing its predictions with the analytical solutions of two classical test cases. For validation, the experimental data of Boeck et al. (1) is used. The experiments were conducted in a rectangular channel the three different blockage ratios and hydrogen concentrations. Comparison is presented between the predicted and measured flame tip velocities. The shaded contours of the predicted temperature and numerical Schlieren (magnitude of density gradient) will be analysed to examine the effects of the blockage ratio on flame acceleration and DDT.
机译：在实验和数值上广泛地研究了均匀反应混合物中的气体爆炸。然而，在实践和工业应用中，可燃混合物通常是不均匀的并且受垂直浓度梯度的影响。在这种背景下进行了有限的研究，这导致了对这种情况下的爆炸特性有限的理解。目前的数值调查旨在研究脱渗流的爆压动力学（DDT）在非均匀氢气/空气混合物中的爆轰转变（DDT），并检查DDT中障碍堵塞比的影响。 vcefoam，已经使用了OpenFoam CFD工具箱框架内的作者最近组装的基于反应密度的求解器。 vcefoam使用Harten-Lax-Van Leer-Contact（HLLC）方案FR的对流势态贡献和冲击捕获。通过将其预测与两个经典测试用例的分析解进行比较来验证求解器。用于验证，Boeck等人的实验数据。 （1）被使用。实验在矩形通道中进行三种不同的封闭比和氢浓度。在预测和测量的火焰尖端速度之间呈现比较。将分析预测温度和数值Schlieren的阴影轮廓（密度梯度的大小），以检查阻塞比对火焰加速度和DDT的影响。

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