Shock tube study of the drag coefficient of a sphere in a non-stationary flow

1993 ◽  
Vol 442 (1915) ◽  
pp. 231-247 ◽  
Keyword(s):  
Shock Tube ◽  
Drag Coefficient ◽  
Stationary Flow ◽  
Wave Flow ◽  
High Acceleration ◽  
Wide Range ◽  
Post Shock ◽  
Exposure Holography ◽  
Sphere Drag ◽  
Tube Study

A review of previous attempts to study the drag coefficient of a sphere in a non-stationary flow, experimentally, is given. Thereafter, a detailed account of the present study is presented. A shock tube facility was used for inducing relatively high acceleration in small spheres laid on the shock tube floor. The spheres acceleration resulted from the drag force imposed by the post shock wave flow. Using double exposure holography, the spheres trajectory could be constructed accurately. Based upon such trajectories, the spheres drag coefficient was evaluated for a relatively wide range of Reynolds number (6000 < Re <101000). It was found that the obtained values for the sphere drag coefficient were significantly larger than those obtained in a similar steady flow case.

Drag coefficient of a sphere in a non-stationary flow: new results

2007 ◽  
Vol 463 (2088) ◽  
pp. 3323-3345 ◽  
Author(s):  
G Jourdan ◽  
L Houas ◽  
O Igra ◽  
J.-L Estivalezes ◽  
C Devals ◽  
...  
Keyword(s):  
Drag Coefficient ◽  
Stationary Flow ◽  
Reynolds Numbers ◽  
Spherical Particles ◽  
Steady Flows ◽  
Two Phase ◽  
Spider Web ◽  
Wide Range ◽  
The Difference ◽  
Sphere Drag

The drag coefficient of a sphere placed in a non-stationary flow is studied experimentally over a wide range of Reynolds numbers in subsonic and supersonic flows. Experiments were conducted in a shock tube where the investigated balls were suspended, far from all the tube walls, on a very thin wire taken from a spider web. During each experiment, many shadowgraph photos were taken to enable an accurate construction of the sphere's trajectory. Based on the sphere's trajectory, its drag coefficient was evaluated. It was shown that a large difference exists between the sphere drag coefficient in steady and non-steady flows. In the investigated range of Reynolds numbers, the difference exceeds 50%. Based on the obtained results, a correlation for the non-stationary drag coefficient of a sphere is given. This correlation can be used safely in simulating two-phase flows composed of small spherical particles immersed in a gaseous medium.

Simulation of Sphere’s Motion Induced by Shock Waves

2012 ◽  
Vol 134 (10) ◽  
Author(s):  
Dan Igra ◽  
Ozer Igra ◽  
Lazhar Houas ◽  
Georges Jourdan
Keyword(s):  
Shock Waves ◽  
Drag Coefficient ◽  
Drag Force ◽  
Stationary Flow ◽  
Experimental Results ◽  
Experimental Findings ◽  
Sphere Drag ◽  
Simulation Scheme ◽  
Good Agreement

Simulations of experimental results appearing in Jourdan et al. (2007, “Drag Coefficient of a Sphere in a Non-Stationary Flow: New Results,”Proc. R. Soc. London, Ser. A, 463, pp. 3323–3345) regarding acceleration of a sphere by the postshock flow were conducted in order to find the contribution of the various parameters affecting the sphere drag force. Based on the good agreement found between present simulations and experimental findings, it is concluded that the proposed simulation scheme could safely be used for evaluating the sphere’s motion in the postshock flow.

Shock Tube Study of Methylcyclohexane Ignition over a Wide Range of Pressure and Temperature

2009 ◽  
Vol 23 (1) ◽  
pp. 175-185 ◽  
Author(s):  
Subith S. Vasu ◽  
David F. Davidson ◽  
Zekai Hong ◽  
Ronald K. Hanson
Keyword(s):  
Shock Tube ◽  
Wide Range ◽  
Tube Study

Shock tube study of the drag coefficient of a sphere

Shock Waves ◽  
2009 ◽  
pp. 521-526
Author(s):  
G. Jourdan ◽  
L. Houas ◽  
O. Igra ◽  
J.-L. Estivalezes ◽  
C. Devals ◽  
...  
Keyword(s):  
Shock Tube ◽  
Drag Coefficient ◽  
Tube Study

scholarly journals A Shock Tube Study of n-Undecane/Air Ignition Delays over a Wide Range of Temperatures

2016 ◽  
Vol 32 (9) ◽  
pp. 2216-2222
Author(s):  
Wei-Feng ZHANG ◽  
◽  
Lei-Yong XIAN ◽  
Kang-Le YONG ◽  
Jiu-Ning HE ◽  
...  
Keyword(s):  
Shock Tube ◽  
Wide Range ◽  
Tube Study

Shock tube study of n-nonane/air ignition over a wide range of temperatures

Fuel ◽  
2017 ◽  
Vol 188 ◽  
pp. 567-574 ◽  
Author(s):  
Kangle Yong ◽  
Jiuning He ◽  
Weifeng Zhang ◽  
Leiyong Xian ◽  
Changhua Zhang ◽  
...  
Keyword(s):  
Shock Tube ◽  
Wide Range ◽  
Tube Study

Numerical investigation of anguilliform locomotion by the SPH method

2019 ◽  
Vol 30 (1) ◽  
pp. 328-346 ◽  
Author(s):  
Amin Rahmat ◽  
Hossein Nasiri ◽  
Marjan Goodarzi ◽  
Ehsan Heidaryan
Keyword(s):  
Drag Coefficient ◽  
Numerical Investigation ◽  
Sph Method ◽  
Content Type ◽  
Aquatic Locomotion ◽  
Wide Range ◽  
Particle Hydrodynamics ◽  
Dummy Particles ◽  
Smoothed Particle ◽  
Sph Algorithm

Purpose This paper aims to introduce a numerical investigation of aquatic locomotion using the smoothed particle hydrodynamics (SPH) method. Design/methodology/approach To model this problem, a simple improved SPH algorithm is presented that can handle complex geometries using updatable dummy particles. The computational code is validated by solving the flow over a two-dimensional cylinder and comparing its drag coefficient for two different Reynolds numbers with those in the literature. Findings Additionally, the drag coefficient and vortices created behind the aquatic swimmer are quantitatively and qualitatively compared with available credential data. Afterward, the flow over an aquatic swimmer is simulated for a wide range of Reynolds and Strouhal numbers, as well as for the amplitude envelope. Moreover, comprehensive discussions on drag coefficient and vorticity patterns behind the aquatic are made. Originality/value It is found that by increasing both Reynolds and Strouhal numbers separately, the anguilliform motion approaches the self-propulsion condition; however, the vortices show different pattern with these increments.

Shock tube study of decomposition of nitric oxide at high temperatures

1975 ◽  
Vol 15 (1) ◽  
pp. 809-822 ◽  
Author(s):  
M. Koshi ◽  
H. Ando ◽  
M. Oya ◽  
T. Asaba
Keyword(s):  
Nitric Oxide ◽  
Shock Tube ◽  
High Temperatures ◽  
Tube Study
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