基于双多流管模型的同步变桨垂直轴风力机特性分析

Characteristic analysis of a synchronous variable-pitch vertical axis wind turbine based on a double-multiple streamtube model

针对基于叶素理论对同步变桨垂直轴风力机进行性能分析的问题,研究了叶素理论和双盘面多流管模型,阐述了这些模型所做的假设和所适用的领域.分析了双盘面多流管模型的流管宽度特征,指出了该特征即为其在运算中出现不收敛现象的原因,针对该特征进行了改进后,可以明显改善运算不收敛现象并且提高计算速度.对同步变桨垂直轴风力机进行了理论分析,验证了其近似最优特性,得出了其性能在尖速比0.6附近最优的结论.进行了风力发电实验,理论结果与实验数据的对比验证了改进方法的可行性.

This paper aims at validating the formerly used performance analysis of a synchronous variable-pitch vertical axis wind turbine based on the blade element theory.The hypotheses and domain of the blade element theory and double-multiple streamtube model were expatiated after studying these theories.The width characteristics of streamtubes in a double-multiple streamtube model were analyzed and proven to be the reason of divergent phenomena in the calculations.An improvement of these width characteristics was made;afterwards,the divergent phenomena decreased distinctly and the computing speed became faster.Based on the improved model,a synchronous variable-pitch wind turbine was analyzed and proven to be nearly optimal with maximum performance at a tip speed ratio of 0.6,a wind-driven power-generation test was done,by the comparison between the theoretical results and the test data,the feasibility of improvement method was verified.