Unsteady drag on a sphere by shock wave loading

被引:93
作者
Sun, M [1 ]
Saito, T
Takayama, K
Tanno, H
机构
[1] Tohoku Univ, Inst Fluid Sci, Sendai, Miyagi 9808577, Japan
[2] Muroran Inst Technol, Dept Mech Syst Engn, Muroran, Hokkaido 0508585, Japan
[3] Kakuda Space Propuls Lab, Natl Aerosp Lab, Kimigaya, Kakuda, Japan
关键词
unsteady drag force; drag coefficient; sphere; micro-particle;
D O I
10.1007/s00193-004-0235-4
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The dynamic drag coefficient of a sphere by shock wave loading is investigated numerically and experimentally. The diameter of the sphere is varied from 8 mu m to 80 mm in numerical simulation. The axisymmetric Navier-Stokes equations are solved on a fine grid, and the grid convergence of the drag coefficient is achieved. The numerical result is validated by comparing the experimental data of a 80 mm sphere, measured by the accelerometer in a vertical shock tube. It is found that the sphere experiences in the early interaction one order higher drag than in the steady state. A transient negative drag, mainly resulting from the focusing of shock wave on the rear side of the sphere, is observed only for high Reynolds number flows, and the drag becomes positive because of increased skin friction for low Reynolds number flows.
引用
收藏
页码:3 / 9
页数:7
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