| 非球形风沙粒子的低雷诺数绕流阻力特性研究 |
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| 引用本文： | 马亮,钱光平.非球形风沙粒子的低雷诺数绕流阻力特性研究[J].水动力学研究与进展(A辑),2011,26(1). |
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| 作者姓名： | 马亮 钱光平 |
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| 作者单位： | 北京航空航天大学流体力学研究所,教育部流体力学重点实验室,北京,100191 |
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| 基金项目： | 国家自然科学基金重点项目 |
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| 摘 要： | 采用有限体积法计算了均匀来流条件下圆柱体和正四面体颗粒的低雷诺数三维绕流流场,得到了颗粒在不刚来流方向下的速度分布、压力分布,分析了其阻力特性.结果表明,非球型颗粒的在风场中的绕流阻力大小受来流方向的影响明显,在特定方向阻力最大,这与绕流后的剪切层结构有关.通过比较发现,以往非球型颗粒阻力经验公式给出的只是单一来流方向时的阻力值,而非平均值.根据计算结果给出了新的拟合非球体阻力系数计算公式,可以更准确地估算非球型风沙颗粒各来流方向的平均阻力值.
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| 关 键 词： | 非球型颗粒 阻力系数 低雷诺数 |
The study on the lower Reynolds drag around nonspherical sand particles |
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| MA Liang,QIAN Guang-ping.The study on the lower Reynolds drag around nonspherical sand particles[J].Journal of Hydrodynamics,2011,26(1). |
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| Authors: | MA Liang QIAN Guang-ping |
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| Affiliation: | MA Liang,QIAN Guang-ping(Institute of Fluid Mechanics,Beijing university of aeronautics and astronautics,Beijing 100083,China) |
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| Abstract: | Three dimensional numerical flow field around a cylinder or tetrahedron-shaped blown sand particles are simulated.The flow velocity and pressure distributions with different inflow condition are computed and analyzed.It is shown that the drag coefficient is strongly influenced by inflow direction and the maximum drag occurs at a certain inflow angle as a result of different coherent structure.The drag coefficient value previously calculated by using empirical formula is only for a single inflow direction bu... |
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| Keywords: | nonspherical sand particles drag coefficient lower Reynolds number |
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