城市环境Savonius风轮地面效应数值模拟  

Numerical Simulation of Ground Effect on Savonius Rotor Mounted in the Urban Environment

作　　者：朱建勇[1,2] 马树元[1] 王建明[1] 刘沛清[2] 

机构地区：[1]沈阳航空航天大学航空航天工程学部,沈阳110136 [2]北京航空航天大学流体力学教育部重点实验室,北京100191

出　　处：《电网与清洁能源》2016年第3期127-133,共7页Power System and Clean Energy

基　　金：国家自然科学基金(11272034);辽宁省自然科学基金(20102177)~~

摘　　要：为了利用城市环境中的风能资源,提出一种卧式安装在屋顶的Savonius风轮。通过数值模拟方法研究Savonius风轮地面效应,研究了间隙比(风轮离地高度H与风轮旋转直径D_R的比值)对风轮气动特性的影响,并分析了风轮的雷诺数效应和尾流特性。计算结果表明:地面效应影响风轮的气动特性;在间隙比H/D_R=0.4时,风轮的启动性能最优,相比未受地面效应影响的风轮,其扭矩系数和功率系数得到明显的提高,较高功率系数对应的尖速比区间得到拓宽,尾流速度亏损恢复需要更长的距离;雷诺数的增加有助于提高风轮的气动特性。A roof-mounted Savonius-type wind turbine with its rotation axis parallel to the roof ground is presented for utilization of wind energy in urban areas. The Savonius rotor operating in ground effect is investigated numerically. The effect of the clearance ratio and the Reynolds number on the aerodynamic performance of the rotor IS investigated and the Reynolds number effect and wake characteristics are analyzed. The results indicate that,the ground effect affects the aerodynamic performance of the rotor. In contrast with the case without the ground effect, at the clearance of 0.4, the starting performance is optimal,the torque coefficient and power coefficient get imp-roved significantly,the range of the tip speed ratios corres-ponding to relatively high power coefficients expands and the wind velocity ratio does not recover in the wake of the rotor at15 times rotation diameter. The aerodynamic performance of the rotor also improves with the increase of the Reynolds number.

关 键 词：风能 Savonius风轮 地面效应 城市环境 建筑屋顶 气动特性 间隙比 雷诺数 数值计算 

分 类 号：TK89[动力工程及工程热物理—流体机械及工程]