风机叶片的防颤设计与试验分析

本文着重对内蒙牧民用的50瓦双叶风力发电叶片振动故障进行了理论计算和试验分析研究。确认叶片出现强烈振动故障是流体诱发振动的颤振现象。为了排故,设计了两种排振防颤的新叶型,即FD-01型与FD-02型。其中对FD-01型叶片进行了野外车载试验,并采用7T17频谱分析仪进行数据处理与分析。 

EXPERIMENTAL ANALYSIS AND MODIFICATION OF A WINDMILL FAN FOR PREVENTING FLUTTER

A Violent vibration emerged in the fan of a 50W wind-driven generator and caused manycracks at its surface as the velocity of wind reached about 8-10m/s. Some of the fans even broke down near the root(about J/3 length to root). Theoretical and experimental analysesof the faults show that the violent vibration is caused essentially by flutter due to flow -induced vibration. Therefore, the fan was modified into two new types (FD-1 and FD-2) to prevent the forced vibration and flutter. According to the flutter theory,the attack angle of the original fan was changed and its weight center was moved ahead so that the modified fans possessed enhanced natural frequence and decreased reduced velocity.The modified fan FD-1 was investigated by testing on the running car. The windmill generator with this fan started smoothly and ran very well. When the velocity of wind was about gm/3, its maximum power was about 74W,nearly 1.5 time of the original. No flutter phenomenon occured.