风力机翼型气动噪声数值计算及设计研究
发布时间：2019-03-11 15:19
【摘要】：随着风力机的快速发展,气动噪声问题已经成为其重要制约因素之一,对于风力机噪声问题的研究必将成为风力机发展过程中的重要议题。为了研究风力机气动噪声,本文选取了风力机专用翼型S809翼型作为研究模型,利用半经验算法和计算流体力学与计算气动声学相结合的方法预测翼型的噪声,主要是尾缘噪声产生过程和传播特性。偏转翼型的尾缘会使翼型的气动性能产生变化,同时对流经翼型的气动噪音也会产生一定影响。为评价翼型尾缘偏转对气动性能和气动噪音的影响水平,本文采用NASA基于充足声学实验结果而得的翼型自噪声方法进行建模。选取S809翼型为研究模型,翼型的升阻比和气动噪声为优化目标,优化其尾缘偏转的弦向位置和偏转角度,从而得到设计迎角下兼顾气动性能和气动噪声的尾缘变化方案,同时为了验证优化后的效果,本文将优化结果应用于NREL直径10m的真实叶片,得到了与翼型优化相同的结果。在气动噪声数值模拟方面,本文采用LES/FW-H相结合的方法对NACA0018和S809翼型的流动和发声进行非定常数值模拟研究,获得了相应的流场和声场的计算结果,并对尾缘噪声特性进行了分析。在此基础上,本文对钝尾缘的S809翼型的气动噪声特性进行了设计分析,给出钝尾缘对风力机翼型气动噪声的影响。
[Abstract]:With the rapid development of wind turbine, the problem of aerodynamic noise has become one of its important constraints, and the research on the noise of wind turbine will be an important issue in the development of wind turbine. In order to study the aerodynamic noise of the wind turbine, the special airfoil S809 airfoil for wind turbine is selected as the study model, and the noise of the airfoil is predicted by means of the semi-empirical algorithm and the method of combining the computational fluid dynamics with the calculation of the aerodynamic acoustics, which is mainly the process and propagation characteristics of the trailing edge noise. The trailing edge of the deflected airfoil results in a change in the aerodynamic performance of the airfoil, while the aerodynamic noise flowing through the airfoil will also have a certain impact. In order to evaluate the effect of the airfoil trailing edge deflection on the aerodynamic performance and aerodynamic noise, an airfoil self-noise method based on the results of sufficient acoustic experiments was used to model the aerodynamic performance and aerodynamic noise. The S809 airfoil is selected as the study model, the lift-drag ratio and the aerodynamic noise of the airfoil are the optimization targets, the chord-to-chord position and the deflection angle of the tail edge deflection are optimized, the tail edge change scheme of the aerodynamic performance and the pneumatic noise is taken into consideration at the design angle of attack, and meanwhile, in order to verify the optimized effect, The optimization results are applied to the real blades of the NREL diameter of 10 m, and the same results as the airfoil optimization are obtained. In the aspect of the numerical simulation of aerodynamic noise, the unsteady numerical simulation of the flow and sound of the airfoil of the NACA0018 and S809 is studied by using the combination of LES/ FW-H, and the results of the corresponding flow field and sound field are obtained, and the noise characteristics of the trailing edge are analyzed. On this basis, the aerodynamic noise characteristics of the S809 airfoil of the blunt trailing edge are analyzed, and the effect of the blunt trailing edge on the aerodynamic noise of the wind turbine is given.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315
，
本文编号：2438393
[Abstract]:With the rapid development of wind turbine, the problem of aerodynamic noise has become one of its important constraints, and the research on the noise of wind turbine will be an important issue in the development of wind turbine. In order to study the aerodynamic noise of the wind turbine, the special airfoil S809 airfoil for wind turbine is selected as the study model, and the noise of the airfoil is predicted by means of the semi-empirical algorithm and the method of combining the computational fluid dynamics with the calculation of the aerodynamic acoustics, which is mainly the process and propagation characteristics of the trailing edge noise. The trailing edge of the deflected airfoil results in a change in the aerodynamic performance of the airfoil, while the aerodynamic noise flowing through the airfoil will also have a certain impact. In order to evaluate the effect of the airfoil trailing edge deflection on the aerodynamic performance and aerodynamic noise, an airfoil self-noise method based on the results of sufficient acoustic experiments was used to model the aerodynamic performance and aerodynamic noise. The S809 airfoil is selected as the study model, the lift-drag ratio and the aerodynamic noise of the airfoil are the optimization targets, the chord-to-chord position and the deflection angle of the tail edge deflection are optimized, the tail edge change scheme of the aerodynamic performance and the pneumatic noise is taken into consideration at the design angle of attack, and meanwhile, in order to verify the optimized effect, The optimization results are applied to the real blades of the NREL diameter of 10 m, and the same results as the airfoil optimization are obtained. In the aspect of the numerical simulation of aerodynamic noise, the unsteady numerical simulation of the flow and sound of the airfoil of the NACA0018 and S809 is studied by using the combination of LES/ FW-H, and the results of the corresponding flow field and sound field are obtained, and the noise characteristics of the trailing edge are analyzed. On this basis, the aerodynamic noise characteristics of the S809 airfoil of the blunt trailing edge are analyzed, and the effect of the blunt trailing edge on the aerodynamic noise of the wind turbine is given.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315
，
本文编号：2438393
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