绊线对H型风轮启动特性的影响

Effect of Tripwire on Startup Characteristics for H-type Wind Rotor

为了提高H型风轮的启动性能,在叶片上安装绊线对风轮进行流动控制,通过对某三叶片H型风轮进行风洞试验,得到风轮在不同相位位置的静扭矩分布以及启动过程中转速随时间变化曲线。分析绊线在不同风速下对H型风轮启动特性的影响效果,并确定绊线作为流动控制手段的适用风速范围。结果表明:绊线使得风轮在大部分相位位置处的静扭矩得到提高,但是在个别相位位置的静扭矩减小;从启动曲线角度来看,在风速10～12 m/s,绊线能够缩短风轮的启动时间,增大风轮的最大空载转速;在风速13～14 m/s,绊线略微缩短风轮启动时间,有/无绊线风轮几乎对应相同的最大空载转速;在风速15～18 m/s,有/无绊线风轮在线性加速段的转速曲线几乎重合,绊线使得风轮的启动时间延长,最大空载转速得到提高。因此,在低雷诺数工作条件下,绊线对于提高H型风轮的启动性能和功率输出是有效的流动控制手段。

In order to improve startup capacity of H-type wind rotor, the tripwire mounted in the rotor blade is used for flow control. A certain 3-bladed H-type wind rotor has been investigated experimentally. The static torque distribution at different phase angles and the rotation speed curve during startup are obtained. The effect of tripwire on startup characteristics at different wind velocities is detailed analyzed and the rang of wind velocity for tripwire contributing to startup is determined. The experiment results indicate, the static torques at most of phase positions increase on account of tripwire, though the static torques at particular phase positions decrease. In terms of rotation speed curve during startup, at 10-12 m/s, tripwire benefits shortening startup time and increasing no load rotation speed. At 13-14 m/s, tripwire slightly shortens startup time and almost little impact on no load rotation speed. At 15 m/s-18 m/s, the rotation speed curves in the linear speed-up stage between original rotor and rotor equipped with tripwire almost coincide, however, tripwire prolongs the startup time and results in the faster no load rotation speed. Therefore, tripwire is an effective flow control means for improving startup performance and output power.