为提高风力俘能结构能量收集效率,提出一种新型的波浪锥型无叶片风力俘能结构,建立了波浪锥型风力俘能结构能量转换数学模型,采用雷诺平均N-S方程结合SST k-ω湍流模型对俘能结构涡激振动响应过程进行了数值模拟,分析了质量比、阻尼比对波浪锥型风力俘能结构涡激振动响应和风能转换效率的影响.结果表明:质量比$m^*=2$,阻尼比ζ=0.05的波浪锥型俘能结构可获得更宽的锁频区间,能量转换效率更高.同时发现质量阻尼比$m^* ζ$直接影响能量转换效率,合适的$m^* ζ$组合可以提高能量转换效率, $m^* ζ=0.10$的情况下平均能量转换效率较$m^* ζ=0.05$提高近31%.研究结果可为无叶片风力发电机能量转换效率的提升提供理论支持.

In order to improve the energy harvesting efficiency of the wind energy capture structure, this paper proposes a novel wavy conical bladeless wind energy capture structure, and establishes a mathematical model for energy conversion of the wavy conical wind energy capture structure. The Reynolds-averaged N-S equations in combination with the SST k-ω turbulence model is used to numerically simulate the vortex-induced vibration response of the energy capture structure, and analyze the effects of mass ratio and damping ratio on the vortex-induced vibration response and wind energy conversion efficiency of the wavy conical wind energy capture structure. The results show that the wavy conical energy capture structure with a mass ratio of m^*=2 and a damping ratio of ζ=0.05 can obtain a wider lock-in interval and higher energy conversion efficiency. It is also found that the mass damping ratio m^*ζ directly affects the energy conversion efficiency, a suitable combination of m^*ζ can improve the energy conversion efficiency, with an average energy conversion efficiency of nearly 31% higher at m^*ζ=0.10 than at m^*ζ=0.05. The research results can provide theoretical support for the improvement of the energy conversion efficiency of bladeless wind turbines.