摘要
在直流低速风洞中,应用B&K公司的60通道圆形声阵列、丹麦B&K公司PULSE结构振动测试分析系统及应力应变动态旋转遥测技术,针对直径1.4 m的某S翼型水平轴风力机风轮模型开展实验得出不同工况下,噪声总声压级分布特征以及噪声源位置分布规律及沿翼展方向上应变幅值的变化规律。实验结果表明:风轮旋转时,噪声源能量最大区域主要集中在叶片中部(r/R=0.54),且不会随风速和尖速比的改变而改变最大噪声源位置;噪声源能量最大区域主要发生在叶片振幅最大区域处;应变最大幅值区域主要集中在叶片中部(r/R=0.51处),最大幅值区域不随风速和尖速比的改变而改变。利用SPSS统计分析软件,对噪声声压级和应变幅值做沿叶片展向方向上的互相关分析得到,在0.17R^0.74R区域内,相关系数大于0.8呈高度相关,0.85R区域附近的相关系数为0.782,呈中度相关。
In the DC low speed wind tunnel, 60 circular channel acoustic array applications of the Danish B ＆ K Company, PULSE structural vibration measurement and analysis system and stress - strain dynamic rotating telemetry technology of Danish B ＆ K Company were used for the experiment of 1.4 m diameter S airfoil horizontal axis wind turbine model, the noise distribution characteristics in the total sound pressure level, the location distribution regularity of noise source and the strain amplitude variation along the spanwise under different conditions were obtained. The experimental results show that during the rotation of the wind turbine, the maximum energy area of the noise source is mainly concentrated on the centre blade （r/R=0.54）, and the position of the maximum noise source will not change with wind speed and tip speed ratio ; the maximum energy area of the noise source mainly occurs at the maximum amplitude area of the blade;The maximum amplitude strain area are mainly concentrated on the central part of blade （r/R=0.51）, the maximum amplitude area does not change with wind speed and tip speed ratio. Especially, the cross correlation analysis of the noise sound pressure level and strain amplitude along the blade span-wise direction can be carried out by SPSS statistical analysis software to obtain that the correlation coefficient of greater than 0.8 is highly correlation in the region of the 0.17R-0.74R, the correlation coefficient around 0.85R region is 0.782 which shows a moderate correlation.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2016年第8期2111-2117,共7页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51366010)
关键词
模态
噪声源
水平轴风力机
声压级
应变幅值
SPSS
modality
noise source
horizontal axis wind turbine
sound pressure level
strain amplitude
SPSS
