【摘要】 为探究结构变化对涡环输送的作用，设计一种基于空气驱动活塞运动模式的空气涡环发生器，采用实验方法研究了涡环发生器的长径比、环径比及活塞停顿时间对涡环输送特性的影响，通过数值仿真对涡环输送过程的速度场和压力场进行分析。结果表明：长径比与环径比对涡环输送特性影响较大，活塞停顿时间的影响较小，其中涡环输送的最远距离为277 cm;长径比过大会造成较大沿程损失，环径比过大会造成较大局部损失，阻碍涡环的生成和输送，而涡环具有在较小能量耗散的同时远距离输送的特性。更多还原

【Abstract】 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.更多还原