基于微沟槽表面海流发电叶片翼型降噪特性研究  

Noise Reduction Characteristics of Hydrofoils of Marine Current Turbines With Microgrooves on the Surface

作　　者：党志高 毛昭勇[1] 田文龙[1] DANG Zhi-Gao;MAO Zhao-Yong;TIAN Wen-Long(School of Marine Science and Technology,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《工程热物理学报》2020年第6期1367-1374,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金面上项目(No.61572404);国家自然科学基金青年项目(No.51809214)。

摘　　要：为解决海流能发电叶片流噪声较为严重这一问题,通过构造微沟槽表面的海流发电叶片翼型,采用大涡模拟与FW-H方程声类比相结合的方法,对试验测试样机叶片翼型的流噪声特性进行了研究。结果表明:数值计算结果与试验测量结果较为吻合;不同结构参数h和N的微沟槽结构对于翼型绕流噪声的影响均不同,最佳的结构参数为h=0.15 mm和N=33;微沟槽表面改善翼型流噪声机理在于微沟槽凹槽的内部产生了二次旋涡,改善微沟槽处翼型表面的流动情况,使翼型产生显著的减阻增升效果,达到微沟槽表面翼型降噪的目的,因此提出的微沟槽表面的方案对于抑制翼型流噪声具有一定的参考价值。In order to solve the serious flow noise problems of marine current turbines,a new scheme of hydrofoil with microgroove surface is proposed for noise reduction.Large eddy simulation combined with acoustic analogy of FW-H equation is applied to investigate the hydrofoils of the testing marine current turbine prototype.The results show that the numerical results are very close to the experimental results.It is found that the microgroove surface with different parameters h and N have different effects on flow noise of the hydrofoils,and the best parameters are h=0.15 mm and N=33.The mechanism of reducing flow noise using the microgroove surface is that secondary vortices are generated inside the microgrooves,which can improve the flow situation on the surface of airfoil at microgrooves.What’s more,it makes the airfoil produce remarkable drag reduction and lift enhancement effect,resulting in achieving the purpose of reducing noise in the flow.Therefore,the proposed scheme with microgroove surface has a certain reference value for suppressing airfoil flow noise.

关 键 词：微沟槽表面 降噪 海流能发电 翼型 数值计算 

分 类 号：TK730[交通运输工程—轮机工程]