外界载荷对圆柱涡激振动能量转换的影响  

Effects of external load on energy conversion of vortex-induced vibrating cylinder

作　　者：王军雷[1] 冉景煜[1] 张智恩[1] 张力[1] 蒲舸[1] 丁林[1] 

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044

出　　处：《浙江大学学报（工学版）》2015年第6期1093-1100,共8页Journal of Zhejiang University：Engineering Science

基　　金：高等学校博士学科点专项科研基金优先发展资助项目(20120191130003)

摘　　要：为了提高涡激振动的能量收集效率,研究外界载荷对三相耦合圆柱绕流涡激振动能量转换的影响.使用矩阵法分析外界载荷对涡激振动能量转换系统阻尼和固有频率的影响,并使用准稳态近似理论推导获得机电耦合系统电压输出的准稳态解析式.在此基础上,应用OpenFOAM开源平台对Navier-Stokes、二阶范德波尔方程和高斯定律进行涡激振动耦合计算.结果表明:当外界载荷增大时,系统阻尼先增大后减小,圆柱振幅曲线峰值和锁振区域先减小后增大,输出电压和电压曲线的锁振区域相应增大,而固有频率基本不变;系统输出功率随着载荷的增大出现先增大后减小的趋势;当满足98<Re<103时,输出电压及功率较大,可以实现圆柱涡激振动高效率的能量转换.Impact of external load on energy conversion of vortex-induced vibration in three-phase coupling flow around cylinder was studied in order to improve its efficiency of energy harvesting. The effects of external load on the systematic damping and natural frequency of energy conversion in vortex-induced vibration were examined using matrix method. A quasi-steady solution form of voltage output in the electromechanical coupling system was induced via the quasi-steady approximation method. Based on the open-source platform of OpenFOAM software, coupling calculation for the vortex-induced vibration was taken on Navier-stokes equation, second-order Van der pol equation and Gauss law. Results showed that, with the increase of external load, the systematic damping first increases then decreases, the peak values and the lock-in region of the cylinder amplitude curve first decreases then increases, and the output voltage and the lock-in region of the voltage curve increases, while the natural frequency basically remains unchanged. In the range of Reynolds number from 98 to 103, the considerable values of voltage and power output can make high-efficiency energy conversion of cylindrical vortex-induced vibration.

关 键 词：圆柱绕流 涡激振动 三相耦合 反馈 能量转换 

分 类 号：O353[理学—流体力学]