공기저항 저감을 위한 컨테이너선 상부구조물 형상설계 및 성능평가
Design and Performance Evaluation of Superstructure Modification for Air Drag Reduction of a Container Ship
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Reduction of the fuel oil consumption and corresponding greenhouse gas exhausted from ships is an important issue for today’s shipdesign and shipping. Several concepts and devices on the superstructure of a container ship were suggested and tested in the windtunnel to estimate the air drag reduction. As a preliminary performance evaluation, air drag contributions of each part of thesuperstructure and containers were estimated based on RANS simulation respectively. Air drag reduction efficiency of shapemodification and add-on devices on the superstructure and containers was also estimated. Gap-protectors between containers and avisor in front of upper deck were found to be most effective for drag reduction. Wind tunnel tests had been carried out to confirm thedrag reduction performance between the baseline(without any modification) configuration and two modified superstructure configurationswhich were designed and chosen based on the computation results. The test results with the modified configurations show considerableaerodynamic drag reduction, especially the gap-protectors between containers show the largest reduction for the wide range ofheading angles. RANS computations for three configurations were performed and compared with the wind tunnel tests. Computationresult shows the similar drag reduction trend with experiment for small heading angles. However, the computation result becomes lessaccurate as heading angle is increasing where the massively separated flow is spread over the leeward side.
Abstract
Reduction of the fuel oil consumption and corresponding greenhouse gas exhausted from ships is an important issue for today’s shipdesign and shipping. Several concepts and devices on the superstructure of a container ship were suggested and tested in the windtunnel to estimate the air drag reduction. As a preliminary performance evaluation, air drag contributions of each part of thesuperstructure and containers were estimated based on RANS simulation respectively. Air drag reduction efficiency of shapemodification and add-on devices on the superstructure and containers was also estimated. Gap-protectors between containers and avisor in front of upper deck were found to be most effective for drag reduction. Wind tunnel tests had been carried out to confirm thedrag reduction performance between the baseline(without any modification) configuration and two modified superstructure configurationswhich were designed and chosen based on the computation results. The test results with the modified configurations show considerableaerodynamic drag reduction, especially the gap-protectors between containers show the largest reduction for the wide range ofheading angles. RANS computations for three configurations were performed and compared with the wind tunnel tests. Computationresult shows the similar drag reduction trend with experiment for small heading angles. However, the computation result becomes lessaccurate as heading angle is increasing where the massively separated flow is spread over the leeward side.
참고문헌 (17)
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