双机组十字叉型立轴潮流能水轮机性能分析

为研究传统H型立轴水轮机的一种改进形式即双机组十字叉型立轴潮流能水轮机这种新型水轮机的水动力性能，采用ANSYS-CFX模拟水轮机不同的运行工况，对比分析双机组十字叉型水轮机和单机组H型水轮机的水动力性能.结果表明:双机组水轮机比单机组水轮机效率提高将近10%；对于涨潮和落潮两种不同运行工况，双机组水轮机的效率变化不大；十字叉型水轮机的推力、侧向力和力矩平均值和H型水轮机相等，但其波动幅值远小于H型水轮机的波动幅值，这对水轮机的结构安全、疲劳寿命会产生有益的影响.因此双机组十字叉型水轮机比H型单机组水轮机有明显优势，既能提高水轮机发电效率，又能保证水轮机运行寿命.
To study the effect of hydrodynamic performance on the new type vertical axis tidal turbine, using ANSYS-CFX software is adopted to simulate different working conditions for comparing the hydrodynamic performance between cross-type twin-turbine and H-type single turbine. Cross-type vertical axis tidal current twin-turbine is an improved form to traditional H-type turbine. The results show that: the efficiency of twin-turbine is about 10% higher than that of single turbine. The efficiency of twin-turbine changes little for ebbs and flows. The average values of thrust, lateral force and moment are equal between cross-type turbine and H-type turbine, but cross-type turbine's amplitude of fluctation is far less than that of H-type turbine, which can produce beneficial effects on the structure safety and fatigue life of turbines. Therefore, the cross-type vertical axis tidal current twin-turbine has obvious advantages compared to H-type single turbine in the efficiency and guarantying running life.