Comparative study on the prediction of speed-power-rpm of the KVLCC2 in regular head waves using model tests

• Published in: International journal of naval architecture and ocean engineering Vol. 13; pp. 24 - 34
• Main Authors: Yu, Jin-Won, Lee, Cheol-Min, Seo, Jin-Hyeok, Chun, Ho Hwan, Choi, Jung-Eun, Lee, Inwon
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2021; Elsevier; 대한조선학회
• Subjects: Indirect prediction methods; Overload factors; Regular head waves; Speed-power-rpm; 조선공학; Speed-power-rpm; Regular head waves; Overload factors; Indirect prediction methods
• ISSN: 2092-6782; 2092-6790
• DOI: 10.1016/j.ijnaoe.2020.12.003

This paper predicts the speed-power-rpm relationship in regular head waves using various indirect methods: load variation, direct powering, resistance and thrust identity, torque and revolution, thrust and revolution, and Taylor expansion methods. The subject ship is KVLCC2. The wave conditions are the regular head waves of λ/LPP = 0.6 and 1.0 with three wave steepness ratios at three ship speeds of 13.5, 14.5 and 15.5 knots (design speed). In the case of λ/LPP = 0.6 at design speed, two more wave steepness ratios have been taken into consideration. The indirect methods have been evaluated through comparing the speed-power-rpm relationships with those obtained from the resistance and self-propulsion tests in calm water and in waves. The load variation method has been applied to predict propulsive performances in waves, and to derive overload factors (ITTC, 2018). The overload factors have been applied to obtain propulsive efficiency and propeller revolution. The thrust and revolution method (ITTC, 2014) has been modified.