渗流切向水流耦合作用下多孔介质水动力试验

Hydrodynamic Test on Porous Media Coupled Action of Seepage tangential Flow

摘要:

研制专门的渗流切向水流耦合作用实验装置，对均匀球体构成的多孔介质进行了法向渗流作用下表层孔隙水动力试验，探讨了水深和渗流强度对多孔介质孔隙内水动力的影响,试验结果表明，孔隙中动水压力与紊动强度远小于顶层球体以上的主流区；渗流强度与孔隙内水体渗出速率呈正相关关系；孔隙内紊动强度、动水压力随孔隙所在深度的增大而逐渐降低，且降低幅度逐层减小；渗流条件对相同位置孔隙的侧向动水压力的影响不显著.

Abstract:

A special setup was developed to observe the coupled effects of seepage and tangential flow. Experimental hydrodynamic analysis was performed on the boundary layer of permeable beds subjected to bed normal seepage. The bed is made up of uniform sized spheres. The hydrodynamic influences of flow depth and seepage intensity on the flow structure in the pores of the permeable bed were analyzed. The results indicate that the hydrodynamic pressure and turbulence intensity in the pores are much smaller than in the tangential flow above the bed. The results also show that the seepage intensity has positive correlation with outward seepage rate from the pores. The flow turbulence intensity and hydrodynamic pressure in pores descends with the increasing of depth, and the descending rate gets down as well. The influence of different seepage conditions on transverse hydrodynamic pressure is not obvious.