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Numerical simulation on near-field aerodynamic noise of an adjustable-blade axial-flow fan
Aip Advances ( IF 1.6 ) Pub Date : 2020-09-10 , DOI: 10.1063/5.0019423
Lin Wang 1 , Nini Wang 2 , Chunguo An 2 , Suoying He 1 , Ming Gao 1
Affiliation  

A numerical simulation method based on the Ffowcs-Williams and Hawkings model is employed to predict the mechanisms of the near-field aerodynamic noise distribution characteristics of an adjustable-blade axial-flow fan with different installation angles of moving blades (Δβ). The simulated results reveal that with Δβ changing from −12° to 12°, the changing curves of the maximum total sound pressure level (MTSPL) at the tip clearance region (A region), the leading edge region (B region), and the trailing edge region (C region) exhibit an apparently rising trend, which increase by 4.0 dB, 5.7 dB, and 4.3 dB, respectively. Besides, the MTSPL at the C region is always smaller than that at A and B regions within the studied installation angles. Additionally, the acoustic energy ratio (Cpi) is the ratio of the sound energy density of a certain frequency to the total sound energy density, which shows the various frequency distribution characteristics under studied angles. It is found that when Δβ deflects from −12° to 0°, Cp1 (the acoustic energy ratio at the low-frequency in the range of 20–500) decreases from 0.71 to 0.59, Cp2 (the acoustic energy ratio at the intermediate-frequency in the range of 500–2000) increases from 0.18 to 0.25, and Cp3 (the acoustic energy ratio at the high-frequency in the range of 2000–3000) rises from 0.1 to 0.16. This study derives the aerodynamic distribution characteristics of the TSPL and acoustic energy in the near field of moving blades, which reveals its changing rules and frequency distribution under various installation angles. The conclusions may provide guidance for the research regarding the technology of the noise control of the adjustable-blade axial-flow fan.

中文翻译:

可调叶片轴流风机近场空气动力噪声的数值模拟

采用基于Ffowcs-Williams和Hawkings模型的数值模拟方法,预测了动叶片安装角(Δβ)不同的可调叶片轴流风机的近场空气动力噪声分布特性的机理。模拟结果表明,当Δβ从-12°变为12°时,在尖端间隙区域(A区域),前缘区域(B区域)和顶部区域的最大总声压级(MTSPL)的变化曲线。后缘区域(C区域)表现出明显的上升趋势,分别增加了4.0 dB,5.7 dB和4.3 dB。此外,MTSPL在所研究的安装角度内,C区域的C总是小于A和B区域的C。另外,声能比(C pi)是某一频率的声能密度与总声能密度之比,它表示在所研究的角度下的各种频率分布特性。发现当Δβ从-12°偏转到0°时,C p 1(在20–500范围内的低频声能比)从0.71下降到0.59,C p 2(声能比)在500-2000的中频范围内)从0.18增加到0.25,并且C p 3(在2000–3000范围内的高频声能比)从0.1上升到0.16。这项研究推导了TSPL的空气动力分布特征和动叶片近场中的声能,揭示了其在不同安装角度下的变化规律和频率分布。这些结论可为可调叶片轴流风机噪声控制技术的研究提供指导。
更新日期:2020-09-30
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