Study on the cavitation and noise characteristics by air injection in three dimensional hydrofoil

Hanshin Seol; Hongseok Jeong

doi:10.7776/ASK.2021.40.1.038

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2021 Vol.40, Issue 1 Preview Page Next Page

Research Article

Study on the cavitation and noise characteristics by air injection in three dimensional hydrofoil 3차원 수중익에서 공기분사에 의한 캐비테이션 및 소음특성 연구

31 January 2021. pp. 38-45

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Abstract

In this study, changes in cavitation pattern and noise by air injection were investigated experimentally in a cavitation tunnel. Air injection system that can control the location and the amount of air was manufactured and installed in an elliptic wing that exhibits similar characteristics to those of a propeller blade. Various types of cavitation were simulated on the hydrofoil by adjusting the test conditions in the cavitation tunnel, and the changes in cavitation pattern and noise according to air injection were experimentally analyzed. It was shown that the noise characteristics varied depending on the position and the amount of air injection. This means that in order to apply the air injection technology to the propeller, it is necessary to optimize the air injection location and the amount of injection according to the cavitation characteristics.

Keywords

Propeller noise

Cavitation noise

Air injection

Underwater radiated noise

Model test

본 연구는 함정 추진기에 적용되고 있는 공기분사에 의한 수중방사소음 저감기술에 대한 연구기반을 마련하고자 캐비테이션 터널에서 단순화된 모형을 이용하여 공기분사에 의한 캐비테이션과 소음의 변화에 대하여 연구하였다. 추진기 날개와 유사한 특성을 나타내는 3차원 타원형 수중익에 공기분사 위치와 분사량을 조절할 수 있는 공기분사시스템을 제작하였으며 캐비테이션 터널 시험조건을 조절하여 수중익에 다양한 형태의 캐비테이션을 모사하고 공기분사에 따른 캐비테이션과 소음특성의 변화를 실험적으로 분석하였다. 공기분사 위치 및 분사량에 따라 캐비테이션 및 소음특성이 달라짐을 확인하였다. 이는 추진기에 공기분사 기술을 적용하기 위해서는 캐비테이션의 발생위치, 거동에 따른 공기 분사위치 및 분사량의 최적화가 필요함을 의미한다.

키워드

추진기 소음

공동소음

공기분사

수중방사소음

모형시험

References

H. Seol and S. Y. Kim, "Study on the analysis of model propeller tip vortex cavitation inception" (in Korean), J. Acoust. Soc. Kr. 37, 387-395 (2018).

D. P. Ross, Mechanics of Underwater Noise(Pergamon Press, New York,1973), Chap. 8.

J. S. Carlton, Marine Propellers and Propulson (Butterworth-Heinemann Ltd, Oxford,1994), Chap.10.

W. K. Blake, Mechanics of Flow-Induced Sound and Vibration volume II (Academic Press, London, 1986), pp. 460-469.

H. Lee, Y. Moon, and S. Kang, "Tests on ventilation control of prairie for improving acoustic stealth performance" (in Korean), J. KIMST. 23, 602-608 (2020). 10.9766/KIMST.2020.23.6.602

G. Ku, C. Cheong, and H. Seol, "Numerical investigation of blade tip vortex cavitation noise using Reynolds-averaged Navier-Stokes simulation and bubble dynamics model" (in Korean), J. Acoust. Soc. Kr. 39, 77-86 (2020).

G. Bark and W. B. Berlekom, "Experimental investigations of cavitation dynamics and cavitation noise," Proc. 12th Symp. on Naval Hydrodyn. National Academy of Sciences, 470-493 (1978).

C. T. Hsiao, G. L. Chahine, and H. L. Liu, "Scaling effect on prediction of cavitation inception in a line vortex flow," J. Fluids Eng. 125, 53-60 (2003). 10.1115/1.1521956

Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 40
No :1
Pages :38-45
Received Date : 2020-12-17
Accepted Date : 2021-01-07
DOI :https://doi.org/10.7776/ASK.2021.40.1.038

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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