小型风力机风轮叶尖近尾迹区域声辐射测试与分析  

Measurement and analysis on noise radiation in rotor blade-tip near-wake region of small windmill

作　　者：汪建文[1,2] 白杨[1] 高志鹰[1,2] 东雪青[1,2] 王晓迪[1] 由志刚[1] 

机构地区：[1]内蒙古工业大学能源与动力工程学院,呼和浩特010051 [2]内蒙古自治区可再生能源重点实验室,呼和浩特010051

出　　处：《沈阳工业大学学报》2010年第1期27-31,共5页Journal of Shenyang University of Technology

基　　金：国家自然科学基金资助项目(50976047);内蒙古自治区高等学校科学研究资助项目(NJ09072)

摘　　要：为解决小型风力机风轮叶尖近尾迹区域的噪声问题,利用BSWA VS302USB振动噪声采集分析系统,在风洞开口试验段对不同尖速比条件下的水平轴风力机风轮叶尖下游进行近尾迹声场声辐射测试,对叶尖下游的辐射噪声频谱和声压进行了分析.试验结果表明:风轮旋转过程中风力机叶尖辐射噪声频谱是由旋转风轮的基频及其谐波所构成的离散噪声叠加在宽频噪声上组成的,其中叶片离散的旋转噪声在总噪声级中占主导地位.在叶尖翼型后缘下游存在叶尖涡和附着涡诱导效应区,对流场的扰动较大;在风轮叶尖区域叶片周围存在高压力脉动区域,声压级最强部分靠近叶尖下游区域.To resolve the noise problem in rotor blade-tip near-wake region of small windmill,the noise radiation of near-wake acoustic field in the rotor blade-tip downstream of windmill was measured based on BSWA VS302USB noise vibration acquisition and analysis system over a range of tip speed ratios at the open experiment segment of wind tunnel. The noise pressure and spectrum in the blade-tip downstream were analyzed. The experimental results show that the noise radiation spectrum of rotor blade-tip is composed of the broadband noise superposed by the discrete noise from fundamental frequency and its harmonic in the rotating process of the rotor. The discrete rotation noise is dominant in total noise level. The tip vortex and adhesion vortex appear in the blade-tip airfoil trailing-edge downstream,which can offer the greater disturbance on the flow field in rotor blade tip. The high pressure pulsation region forms around the blade,and the strongest part of sound pressure level is near the downstream region of blade-tip.

关 键 词：水平轴风力机 叶片 叶尖 近尾迹 噪声 涡流 压力脉动 声压 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]