基于自然风非定常性,结合某S翼型水平轴风力机实际运行条件拟合出3种动态入流函数,建立不同入流下的非稳态计算模型,研究动态入流对尾迹气动噪声和叶片压力脉动的影响。结果表明：各动态入流下各倍频声压级均高于恒定入流,大小规律表现为：扰动入流>渐变入流>阵风入流>恒定入流;动态入流对声压级的敏感性随倍频阶数增大而增强;沿轴向动态入流与恒定入流声压级差值逐渐增大;阵风入流、渐变入流和扰动入流的压力脉动峰值依次增大,这也是声压级产生相同大小规律的原因。通过分析入流情况对叶片声场分布和变化规律影响研究,对未来大型叶片噪声评估和降噪设计提供一定的理论和参考依据。
Abstract
Based on the non-stationary characteristic of natural wind, three kinds of dynamic inflow functions are fitted based on the actual operating conditions of an S-wing horizontal axis wind turbine, and the non-stationary calculation models under different inflow are established to study the effects of dynamic inflow on the wake aerodynamic noise and blade pressure pulsation. The results show that： the sound pressure level at each octave is higher than that at constant inflow under dynamic inflow, and the magnitude is as follows： disturbance inflow >gradient inflow > gust inflow > constant inflow; the sensitivity of dynamic inflow to sound pressure level increases with the increase of octave order; the sensitivity of dynamic inflow to sound pressure level increases with the increase of octave order. The sound pressure level difference between dynamic inflow and constant inflow along the axial direction gradually increases; the peak pressure pulsation of gust inflow, gradual inflow and disturbance inflow increases in turn, which is also the reason for the same size law of sound pressure level. By analyzing the influence of the inflow condition on the blade sound field distribution and change law, it provides some theoretical and reference basis for future large blade noise assessment and noise reduction design.
关键词
风力机 /
噪声测量 /
涡量 /
压力脉动 /
动态入流
Key words
wind turbines /
acoustic noise measurement /
vorticity /
pressure pulsation /
dynamic inflow
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基金
国家自然科学基金（51966014）; 内蒙古自治区科技计划项目（2021GG0436）; 内蒙古自治区高等学校科学研究项目（NJZZ21067）; 内蒙古机电职业技术学院科学研究项目（NJDZR2201）
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