Flow induced vibration characteristics of a hydrofoil system with a low mass ratio
WANG Renfeng,YOU Yunxiang,CHEN Ke,HU Xiaofeng
1. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract:Considering the potential impact of aspect ratio on the vibration of structures, the classical Theodorsen equation for the motions of two-degree-of-freedom foils was derived with the modification of its mass parameter and circulation parameter.The time-history curves and the phase orbits of the hydrofoil system at different values of inflow velocity were obtained by solving the equation through MATLAB programming.As the inflow velocity increases, the shape of phase orbits tends to be flattened, which means that the kinetic energy of the system can be transformed into a larger potential energy.Moreover, the finite volume method and semi-implicit integration method were used to discretize the computational domain, and the discrete governing equations were solved with the SIMPLE algorithm.Based on the results of numerical simulation, the transient motion of the hydrofoil system induced by fluid was solved, and the variation of the flow distribution around the hydrofoil during fluttering was analyzed.It is shown that the vortex between the leading edge and the elastic axis on the upper surface gradually spreads towards the trailing edge, forming a vorticity layer.The vorticity layer covers the whole upper surface of the hydrofoil, which is different from attenuated vibrations. As the hydrofoil pitches up, new vorticity layers are generated near the leading edge, and meanwhile the vorticity layer at the trailing edge moves downstream, forming a starting vortex nearby.
王人凤,尤云祥,陈科,胡晓峰. 低质量比舵系统流致振动特征研究[J]. 振动与冲击, 2018, 37(18): 100-107.
WANG Renfeng,YOU Yunxiang,CHEN Ke,HU Xiaofeng. Flow induced vibration characteristics of a hydrofoil system with a low mass ratio. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(18): 100-107.
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