|Table of Contents|

[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()
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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
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
Keywords:
highly skewed propeller non-cavitation noise scale effects frequency domain time domain
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.

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