To investigate the effect of structural changes on vortex ring transport,a vortex ring generator was designed based on the movement mode of an air-driven piston.Experimental methods were used to study the effects of length-diameter ratio,ring-diameter ratio and piston stopping time on the transport characteristics of the vortex ring.Numerical simulation were carried out to analyze the velocity and pressure field in the transport process of the vortex ring.It is found that the effect of length-diameter ratio and ring-diameter ratio on vortex ring transport characteristics is great,but small on piston stopping time,and the maximum transport distance of the vortex ring is 277 cm.An excessive length-diameter ratio causes large linear loss and large local losses attribute to the excessive ring-diameter ratio,which hinder the generation and transportation of vortex rings.Simultaneously,the vortex ring has the transport characteristics of moving a long distance with low energy dissipation.
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