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Experimental Investigation of Effective Drag on a Single or a Double Spherical Model by Shock Loading
Author(s): 
Pages: 342-346
Year: Issue:  2
Journal: Journal of Engineering Thermophysics

Keyword:  shock wavedouble spherical modelsparticle groupdrag coefficientmutual interference;
Abstract: In this study,the effective drags acted on single and double spherical models were directly measured during their interaction with a planar shock wave.The experiments were conducted by using a measuring system mainly consists of a horizontal shock tube with the inner diameter of 200 mm,a high-frequency strain transducer and a high-speed data acquisition system.The result shows that in single-spherical-model cases,effective drag coefficient decreases as shock Mach number increases,and in double-spherical-model cases,effective drag coefficient increases first,and then decreases,finally trends to be stable.It can be summarized that it is necessary to consider the influence of the interferences of shock structures and wake vortexes attributed to different neighbouring particles when particle loading ratio is high enough,in other words,a particle group drag coefficient model,rather than a single particle one should be employed for a gas-solid two-phase flow modeling,furthermore,that the dimensionless interval distance value,corresponding to a point,from which the effective drag coefficient begins to be almost unchangeable,could be regarded as a criteria to choose a proper drag coefficient model.
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