Study on hydrodynamic performance optimization of biplane-type otter boards
To study the effect mechanism of the structural characteristics on the hydrodynamic performance of biplane-type otter boards,this paper employs the computational fluid dynamics method,develops three-dimensional numerical models of biplane-type otter boards,calculates and analyzes their hydrodynamic performance.The validity of the numerical simulation results is verified by designating and manufacturing a scaled model to conduct dynamic flume experiments.In this research,the effect of different structural parameters,i.e.,the curvature of the curved plates,position of the curvature,and support plate spacing,on the hydrodynamic performance of biplane-type otter boards was investigated.Subsequently,the optimal structural design was explored.The results revealed that both simultaneous and single changes in the curvature of the curved plates had different effects on the hydrodynamic performance of biplane-type otter boards.Considering only the expansion effect,the curvature of both the curved plates A and B could be set to about 20％,or the curvature of the curved plate A could be set to 15％and that of the curved plate B to about 25％.In both cases,the maximum lift coefficient of biplane-type otter boards could be increased to the maximum value within a certain range.However,when considering the overall performance of the otter boards,the latter solution could provide the maximum lift-to-drag ratio.When the bending position of the curved plate was set to 50％synchronously,the maximum lift coefficient of the otter boards could reach its maximum value,and the overall performance was relatively better.On the other hand,when the bending position of the curved plate was set to 20％synchronously,the maximum lift-to-drag ratio reached its maximum value and the overall performance of the otter boards became relatively better.The support plate spacing did not have a significant effect on hydrodynamic performance and setting the support plate spacing to about 420 mm could improve the maximum lift-to-drag ratio within small angle range.
biplane-type otter boardshydrodynamic characteristicsnumerical simulationflume tank experimentstructural parameters
万方数据
维普
