Numerical Prediction of the Aerodynamics and Aeroacoustics of a 25 kW Horizontal Axis Wind Turbine

IF 1.5 4区 工程技术 Q3 MECHANICS
Wen-Yu Wang, Y. Ferng
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引用次数: 0

Abstract

In this study, low-frequency-based numerical methods were used to predict the noise radiating from rotating horizontal axis wind turbine (HAWT) blades. The flow parameters in the vicinity of blade surfaces, which are required for the Ffowcs Williams–Hawkings (FW–H) equation, were calculated using ANSYS FLUENT. The numerical model was verified against the experimental re-sults from the National Renewable Energy Laboratory Phase VI wind turbine blades. The coupling analysis was integrated with four Reynolds-averaged Navier–Stokes turbulence models and FW–H equation under various boundary conditions. The standard k-ε, SST k-ω, and V2f turbulence models produced results in agreement with the available experimental pressure coefficient and relative velocity distribution data in the flow fields. Under the verification of aeroacoustic results, the SST k-ω turbulence model were more consistent with the LES data. An Institute of Nuclear Energy Research (INER) 25-kW HAWT was employed to predict noise frequency distribution at nine points on the tower on the windward and leeward sides under different operating conditions. Noise frequency distributions on the windward and leeward sides exhibited slight differences, whereas those on the left and right sides of the tower were different because of wind-shear influence. Under operating conditions, the decibels of the low-frequency noise at 0–200 Hz were ∼25–40 dB, and the noise frequency distributions on the windward and leeward sides were similar. With increasing distance, the decibel number of the monitoring point ∼25 m away dropped to 0 dB. For the noise prediction in Case 2 (wind speed = 12 m/s, pitches = 18°), the decibel number at 50 m was ∼25 dB and was ∼15 dB at 70 m. In Case 3 (wind speed = 18 m/s, pitches = 33°), the decibel number at 50 m was ∼30 dB and was ∼20 dB at 70 m. The peak amplitude of the noise was inversely proportional to the increasing distance from the tower but proportional to the wind and rotational speeds.
25 千瓦水平轴风力涡轮机空气动力学和空气声学数值预测
本研究采用基于低频的数值方法来预测旋转水平轴风力涡轮机(HAWT)叶片的辐射噪声。使用 ANSYS FLUENT 计算了 Ffowcs Williams-Hawkings (FW-H) 方程所需的叶片表面附近的流动参数。根据国家可再生能源实验室第六阶段风力涡轮机叶片的实验结果对数值模型进行了验证。耦合分析综合了四种雷诺平均纳维-斯托克斯湍流模型和各种边界条件下的 FW-H 方程。标准 k-ε、SST k-ω 和 V2f 湍流模型得出的结果与流场中现有的实验压力系数和相对速度分布数据一致。在气声结果验证中,SST k-ω 湍流模型与 LES 数据更为一致。利用核能研究所(INER)的 25 千瓦 HAWT,预测了不同工况下塔架迎风面和背风面九个点的噪声频率分布。迎风面和背风面的噪声频率分布略有不同,而塔架左右两侧的噪声频率分布则由于风切变的影响而有所不同。在运行条件下,0-200 Hz 的低频噪声分贝为 25-40 dB,迎风面和背风面的噪声频率分布相似。随着距离的增加,25 米以外监测点的分贝数下降到 0 分贝。在情况 2(风速 = 12 米/秒,倾角 = 18°)中,50 米处的分贝数为 ∼25 分贝,70 米处为 ∼15 分贝。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Mechanics
Journal of Mechanics 物理-力学
CiteScore
3.20
自引率
11.80%
发文量
20
审稿时长
6 months
期刊介绍: The objective of the Journal of Mechanics is to provide an international forum to foster exchange of ideas among mechanics communities in different parts of world. The Journal of Mechanics publishes original research in all fields of theoretical and applied mechanics. The Journal especially welcomes papers that are related to recent technological advances. The contributions, which may be analytical, experimental or numerical, should be of significance to the progress of mechanics. Papers which are merely illustrations of established principles and procedures will generally not be accepted. Reports that are of technical interest are published as short articles. Review articles are published only by invitation.
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