근접장 효과를 고려한 추진기 얇은 층 캐비테이션에 의해 유기되는 변동압력에 관한 연구
Pressure Fluctuation Induced by Propeller Sheet Cavitation with Consideration of the Near Field Effect
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초록
A theoretical study on the pressure fluctuation induced by a propeller was carried out in this study. The main objective of this study is to analyze the source mechanism of the pressure fluctuation induced by propeller sheet cavitation. To analyze the pressure fluctuation induced by propeller sheet cavitation, modern acoustic theory was applied. Governing equation of pressure fluctuation induced by sheet cavitation was derived using Ffowcs Williams-Hawkings proposed time domain acoustic approaches. Several factors affecting pressure fluctuation were analyzed based on the derived governing equation. Pressure fluctuation result was represented by combined results of the far field term and near field term. Finally, the physical mechanism of pressure fluctuation at the blade rate frequency was analyzed using numerically generated cavitation volume variation.
Abstract
A theoretical study on the pressure fluctuation induced by a propeller was carried out in this study. The main objective of this study is to analyze the source mechanism of the pressure fluctuation induced by propeller sheet cavitation. To analyze the pressure fluctuation induced by propeller sheet cavitation, modern acoustic theory was applied. Governing equation of pressure fluctuation induced by sheet cavitation was derived using Ffowcs Williams-Hawkings proposed time domain acoustic approaches. Several factors affecting pressure fluctuation were analyzed based on the derived governing equation. Pressure fluctuation result was represented by combined results of the far field term and near field term. Finally, the physical mechanism of pressure fluctuation at the blade rate frequency was analyzed using numerically generated cavitation volume variation.
참고문헌 (6)
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- Lee C. S., "An Analysis of Excitation Forces on the Ship Hull Induced by the Propeller", Journal of the Society of Naval Architects of Korea, 29(1), pp.81~92 (1992)
- Seol H., "Numerical Analysis of Underwater Propeller Noise (Part 1. Non-Cavitating Noise)", Journal of the Society of Naval Architects of Korea, 41(2), pp.21~32 (2004)
- 설한신, "수중 프로펠러의 소음 예측에 관한 연구(Part 2. 공동 소음)", 대한조선학회 논문집, 41(2), pp.33~46 (2004), 대한조선학회
- "The Specialist Committee on Cavitation Induced Pressures", 23rd International Towing Tank Conference, pp.417~458 (2002)