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建立了描述可燃粉全-氧气混合物爆轰波的一维两相反应流模型,用MacCormack有限差分格式求解了控制方程,成功地模拟了玉米粉-氧气混合物在氢-氧爆轰驱动下爆轰波的传播过程,其数值结果在接近稳态爆轰区时与实验规律有良好的一致性。 相似文献
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湍流加速火焰的三维数值模拟 总被引:2,自引:0,他引:2
火焰在设有障碍物的管内传播时会自身加速,并可能导致爆炸。本文基于湍流κ-ε模型和改进的EBU—Arrhenius反应模型,对该现象进行了三维空间的数值模拟。计算结果反映了障碍物、湍流和火焰之间相互作用的正反馈机理,描绘了火焰在管内加速传播的三维图像。 相似文献
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Electro–magnetic control of shear flow over a cylinder for drag reduction and lift enhancement 下载免费PDF全文
In this paper, the electro-magnetic control of a cylinder wake in shear flow is investigated numerically. The effects of the shear rate and Lorentz force on the cylinder wake, the distribution of hydrodynamic force, and the drag/lift phase diagram are discussed in detail. It is revealed that Lorentz force can be classified into the field Lorentz force and the wall Lorentz force and they affect the drag and lift forces independently. The drag/lift phase diagram with a shape of "8" consists of two closed curves, which correspond to the halves of the shedding cycle dominated by the upper and lower vortices respectively. The free stream shear (K 〉 0) induces the diagram to move downward and leftward, so that the average lift force directs toward the downside. With the upper Lorentz force, the diagram moves downwards and to the right by the field Lorentz force, thus resulting in the drag increase and the lift reduction, whereas it moves upward and to the left by the wall Lorentz force, leading to the drag reduction and the lift increase. Finally the diagram is dominated by the wall Lorentz force, thus moving upward and leftward. Therefore the upper Lorentz force, which enhances the lift force, can be used to overcome the lift loss due to the free stream shear, which is also obtained in the experiment. 相似文献
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