Experimental and Numerical Investigation on Sound Generation From Airfoil-Flow Interaction
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摘要: 来流湍流干扰噪声在风力机叶片气动总噪声级中占有重要地位．选取圆柱/翼型干涉模型从实验和数值两方面研究此类干涉发声现象．实验中通过对翼型表面非定常载荷的测量，重点研究了圆柱位置和翼型攻角的影响，选取的翼型包括两个NACA系列翼型（NACA0012和NACA0018）和两个风力机翼型（s809和s825），同时利用PIV（particle image velocimetry）技术对低攻角状态下翼型的前缘流场进行了研究．实验结果表明翼型表面非定常压力与圆柱涡脱落存在一定相关性．与此同时采用非定常Reynolds平均(URANS)方法对圆柱/NACA0012翼型的干涉流场进行了非定常数值模拟，并将得到的翼型表面压力频谱与实验结果进行了对比．Abstract: The aerodynamic noise due to the interaction of the incoming turbulence with rotating blades was one of the most important components of wind turbine noise.The rod-airfoil configuration was utilized to investigate the interaction phenomenon both experimentally and numerically.The distribution of unsteady pressure on the airfoil surface was measured for different rod positions and airfoil attack angles.Investigated in the present were two NACA airfoils,NACA0012 and NACA0018,and two wind turbine airfoils,s809 and s825.In addition,for the cases with low angles of attack,the flow field around airfoil leading edge was investigated by particle image velocimetry(PIV).The experimental results indicate that the unsteady pressure disturbances on airfoil surface are relevant to the rod vortex shedding.Meanwhile, the interaction flow field of the rod and NACA0012 airfoil was simulated by unsteady Reynolds averaged Navier-Stokes method(URANS)and the pressure spectra obtained was compared with the experimental results.
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Key words:
- rod-airfoil interaction /
- URANS /
- PIV /
- unsteady pressure
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