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[1] Yang Qiongfang, Wang Yongsheng, Zhang Mingmin,. Scale effects on non-cavitation hydrodynamicsand noise of highly-skewed propeller in wake flow [J]. Journal of Southeast University (English Edition), 2013, 29 (2): 162-169. [doi:10.3969/j.issn.1003-7985.2013.02.010]
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Scale effects on non-cavitation hydrodynamicsand noise of highly-skewed propeller in wake flow()
伴流场中大侧斜桨无空化水动力和噪声的尺度效应分析
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
29
Issue:
2013 2
Page:
162-169
Research Field:
Traffic and Transportation Engineering
Publishing date:
2013-06-20

Info

Title:
Scale effects on non-cavitation hydrodynamicsand noise of highly-skewed propeller in wake flow
伴流场中大侧斜桨无空化水动力和噪声的尺度效应分析
Author(s):
Yang Qiongfang1, Wang Yongsheng1, Zhang Mingmin2
1 College of Marine Power Engineering, Naval University of Engineering, Wuhan 430033, China
2College of Electronic Engineering, Naval University of Engineering, Wuhan 430033, China
杨琼方1, 王永生1, 张明敏2
1海军工程大学动力工程学院, 武汉 430033; 2海军工程大学电子工程学院, 武汉 430033
Keywords:
highly skewed propeller;  non-cavitation noise;  scale effects;  frequency domain;  time domain
大侧斜螺旋桨;  无空化噪声;  尺度效应;  频域;  时域
PACS:
U664.34
DOI:
10.3969/j.issn.1003-7985.2013.02.010
Abstract:
Regarding the scale effects on propeller’s non-cavitation hydrodynamics and hydroacoustics, three similar 7-bladed highly-skewed propellers in the wake flow are addressed with diameters of 250, 500 and 1 000 mm, respectively. The discrete line-spectrum noise and its standardized spectrum level scaling law, together with the total sound pressure level are analyzed. The non-cavitation noise predictions are completed by both the frequency domain method and the time domain method. As a fluctuated noise source, the time-dependent fluctuated pressure and normal velocity distribution on propeller blades are obtained by the unsteady Reynolds-averaged Navier-Stokes(URANS)simulation. Results show that the pressure coefficient distribution of three propellers on the 0.7R section is nearly superposed under the same advance ratio. The periodic thrust fluctuation of three propellers can exactly reflect the tonal components of the axial passing frequency(APF)and the blade passing frequency(BPF), and the fluctuation enhancement from the small to the middle propeller at the BPF is greater than that from the middle to the big one. By the two noise prediction methods, the increment of the total sound pressure level from the small to the big propeller differs by 2.49 dB. Following the standardized scaling law, the spectrum curves of the middle and big propellers are nearly the same while significantly differing from the small one. The increment of both the line-spectrum level and the total sound pressure increases with the increase in diameter. It is suggested that the model scale of the propeller should be as large as possible in engineering to reduce the prediction error of the empirical scaling law and weaken the scale effects.
针对艇尾伴流场中大侧斜桨无空化水动力和水声性能的尺度效应问题, 对几何相似但直径分别为250, 500和1 000 mm的七叶大侧斜桨的无空化线谱噪声及其标准化谱曲线经验公式和总声压级进行了分析.噪声预报同时采用频域和时域计算2种方法.作为脉动噪声源的桨叶表面脉动压力和法向速度分布由URANS模拟得到.结果表明, 在相同进速系数下3种尺度桨的0.7R截面压力系数分布重合度高;3个桨的推力脉动均能准确地反映出轴频和叶频信息, 且中桨相对于小桨在叶频处的推力脉动幅值增量较大桨相对于中桨要大.2种噪声预报方法得到的大桨相对于小桨的总声级增量相差2.49 dB;大桨和中桨标准化谱曲线较为一致, 但与小桨差异明显.随着直径的增加, 线谱谱级和总声级增量增加.建议应尽可能增大模型桨的几何尺度, 以减小经验公式的预报误差和尺度效应影响.

References:

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Memo

Memo:
Biography: Yang Qiongfang(1984—), male, doctor, lecturer, yqfhaijun2008@126.com.
Foundation item: The National Natural Science Foundation of China(No.51009144).
Citation: Yang Qiongfang, Wang Yongsheng, Zhang Mingmin. Scale effects on non-cavitation hydrodynamics and noise of highly-skewed propeller in wake flow[J].Journal of Southeast University(English Edition), 2013, 29(2):162-169.[doi:10.3969/j.issn.1003-7985.2013.02.010]
Last Update: 2013-06-20