Motion of a particle in a shock-induced flow

冲击引起的流动中粒子的运动

• 批准号: 07650218
• 负责人: SUZUKI Tateyuki
• 金额: $ 1.54万
• 依托单位: Toyama Prefectural University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650218/
• 关键词: drag coefficient; shock wave; multi-phase flow; particles; momentum exchange; unsteady flow; high-speed flow; sphere; 非定常; 舞い上がり; マグナス効果

In order to clarify the motion of a particle in a shock-induced flow, the drag coefficient of an accelerating sphere is evaluated by measuring the mean velocity and acceleration of a moving sphere behind a planar shock propagating in a shock tube. In the experiment, the trajectories of the spheres were recorded by a multi-exposure photography. The drag coefficients were then estimated from the trajectories.The relative Reynolds numbers around the moving spheres were in a range from 10^3 to 10^5. The obtained drag coefficients were found to be higher than those from the standard drag curve by 20% on the average. Fitting a curve to the present experimental points in the range of the relative Reynolds number (Re) from 3*10^3 to 10^5 results in the following correlation for the drag coefficient, C_D,C_D=0.35+0.04log_<10>Re.The initial mechanism of a particle's lift-up by a shock passage was also analyzed experimentally. The measured rotating rate of particles revealed that particle's initial rotation is not so effective for a particle to rise up.

为了阐明粒子在冲击引起的流动中的运动，通过测量在冲击管中传播的平面冲击后面的移动球的平均速度和加速度来评估加速球的阻力系数。在实验中，球体的轨迹是通过多曝光摄影记录的。然后从轨迹估算阻力系数。移动球周围的相对雷诺数在10^3到10^5范围内。发现获得的阻力系数高于平均值的标准阻力曲线20％。将曲线从3*10^3到10^5的相对雷诺数（RE）范围内的当前实验点拟合，导致阻力系数，C_D，C_D，C_D = 0.35+0.04Log_ <10> RE。测得的颗粒旋转速率表明，粒子的初始旋转对于粒子的上升不太有效。

项目成果

T.Suzuki: "An Experimental Study on the Mechanism of Initial Particle Life-Up by a Shock Passage" Transactions of the Japan Society for Aeronautical and Space Sciences. 38. 243-250 (1995)

T.Suzuki：“通过冲击通道对初始粒子寿命上升机制的实验研究”日本航空航天学会会刊。

西野利一: "衝撃波と多孔性媒質との干渉" 平成8年度衝撃波シンポジウム講演論文集. 387-390 (1997)

Toshikazu Nishino：“冲击波与多孔介质之间的干涉”1996 年冲击波研讨会论文集 387-390 (1997)。

鈴木立之: "衝撃波に遭遇した微粒子の運動" 日本設計工学会北陸支部平成8年度研究発表論文集. 41-44 (1996)

铃木达之：“细颗粒遇到冲击波的运动”日本设计工程学会北陆分会 1996 年研究报告论文集 41-44 (1996)。

Y.Sakamura: "Mechanism of Oblique Shock-Wave Reflections from a Rough Wall" Proceedings of the 21st International Symposium on Shock Waves. (in print). (1998)

Y.Sakamura：“粗糙墙壁倾斜冲击波反射的机制”第 21 届国际冲击波研讨会论文集。

T.Suzuki: "Interaction of Shock Wave with Dust Layrs" Proceedings of the 21st International Symposium on Shock Waves. (in print). (1998)

T.Suzuki：“冲击波与尘埃层的相互作用”第 21 届国际冲击波研讨会论文集。