A novel technique for producing a steady lift force on a circular cylinder in a uniform flow driven by the longitudinal vortex (LV) is developed. The LV forms behind the cylinder when a strip plate is located downstream in a cruciform arrangement. The upstream cylinder can stably move by itself via an aerodynamic effect of the LV-produced steady lift force. However, the effects of geometrical parameters on system performance have not been investigated. In this study, the effective parameters of the presented mechanism—the width ratio of the strip plate, W/d, and the exposed length ratio of the circular cylinder over the strip plate, l_e/d—are numerically examined. An unsteady Reynolds-averaged Navier–Stokes simulation using a shear-stress-transport k–ω turbulence model is employed for this analysis. The experimental investigation in our wind tunnel laboratory is used to primarily validate the computational predictions. The distribution of the aerodynamic forces acting on the cylinder surface is continuously evaluated along the length span. Flow fields around the system are also visualised for discussion of the vortical effects. The results indicate that the proper parameters of the system needed to generate the available driving force for the moving cylinder are (i) a strip-plate width of 1.5 ​< ​W/d ​< ​2.5, with W/d ​= ​2 being considered as the most suitable, and (ii) an optimal exposed length of the cylinder of l_e ​= ​1.5d.

开发了一种在纵向涡流（LV）驱动的均匀流中在圆柱体上产生稳定升力的新颖技术。当条形板以十字形布置位于下游时，LV在圆柱体后方形成。上游气缸可通过LV产生的稳定升力的空气动力效应稳定地自行移动。但是，尚未研究几何参数对系统性能的影响。在这项研究中，提出的机制的有效参数-带状板的宽度比W / d以及圆柱体在带状板上的裸露长度比l _e / d-进行了数值检查。此分析采用了非稳态雷诺平均Navier-Stokes模拟，该模拟使用剪切应力传输k-ω湍流模型。我们在风洞实验室中进行的实验研究主要用于验证计算预测。沿长度范围连续评估作用在气缸表面上的空气动力的分布。系统周围的流场也可视化，以讨论旋涡效应。结果表明，该系统的适当的参数所需要的以产生用于移动汽缸的可用的驱动力是（我）1.5 <的条板宽度W / d  <2.5，其中W / d = 2被认为是最合适的，并且（ii）圆柱的最佳裸露长度为l _e  = 1.5 d。