Effect of waves on cavitation and pressure pulses of a tanker with twin podded propulsion |
| |
| Institution: | 1. Department of Marine Technology, Norwegian University of Science and Technology (NTNU), Trondheim, Norway;2. Rolls-Royce Marine AS, Norway;1. Sorbonne Universités, Université de Technology de Compiègne, Laboratoire Roberval, UMR-CNRS 7337, Centre de recherches Royallieu CS 60319, 60205 Compiègne cedex, France;2. CEREMA-134, rue de Beauvais, CS 60039, 60200 Compiègne, France;1. University of Genoa, Via Montallegro, 1, 16145 Genova, Italy;2. DETRA Custom Propellers, Via al Molo Giano, Genova, Italy;3. Azimut|Benetti Group, Italy;1. Department of Naval Architecture and Ocean Engineering, Pusan National University, Busan, South Korea;2. Global Core Research Center for Ships and Offshore Plants, Pusan National University, Busan, South Korea;1. Shanghai Merchant Ship Design and Research Institute, Shanghai, 201203, China;2. Shandong Provincial Key Laboratory of Ocean Engineering, China;3. College of Engineering, Ocean University of China, Qingdao, 266100, China;4. College of Shipbuilding Engineering, Harbin Engineering University, Harbin, 150001, China |
| |
| Abstract: | There is increasing interest in optimizing ships for the actual operating condition rather than just for calm water. In order to optimize the propeller designs for operations in waves, it is essential to study how the propeller performance is affected by operation in waves. The effect of various factors that influence the propeller is quantified in this paper using a 8000 dwt chemical tanker equipped with twin-podded propulsion as a case vessel. Propeller performance in waves in terms of cavitation, pressure pulses, and efficiency is compared with the performance in calm water. The influence of wake variation, ship motions, RPM fluctuations and speed loss is studied. Substantial increase in cavitation and pressure pulses due to wake variation in the presence of waves is found. It is found that the effect of other factors is relatively small and easier to take into account as compared to wake variation. Therefore, considering the wake variation at least in the critical wave condition (where the wavelength is close to ship length) in addition to calm water wake is recommended in order to ensure that the optimized propeller performs well both in calm water and in waves. |
| |
| Keywords: | Propulsion in waves Cavitation Pressure pulses Marine propeller Propeller performance in waves Propeller design Twin podded propulsion |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
