Abstract No. C171128-071

Author name(s): Jun YANG, Minghua ZHU, Yu ZHU, Hongwei ZHANG, Jie WANG

Company: Jiangnan Shipyard (Group) Co., Ltd., China

Design of the ventilation system in marine engine room is a very important part of ship design. The traditional method is based on the empirical formula which cannot provide the detail data of air velocity and temperature in local areas. This article introduces the new trend of the ventilation system design of marine engine room and explains the importance and feasibility of the Computational Fluid Dynamics(CFD) technology in such a designing process. The mathematical model of the complex engine room on a new type of scientific research ship was established with FLOEFD software based on the geometry model, where the geometry model was simplified in order to reduce the calculation cost. Boundary conditions and heat sources which are derived from the ventilation calculation report were imposed on the model properly. According to the principle of CFD technology, three-dimensional numerical simulation of the engine room thermal environment was carried out, and the distribution of velocity field and temperature field was achieved. The result shows that the overall temperature distribution was relatively good, but the temperature of some local areas is so high that sailors cannot work there for long time. To solve the problem of such high temperature areas, especially the aisle between the main engines, an optimization plan to modify the position of the air inlets was adopted to reduce the high temperature accumulated in these local areas, and the result shows that the plan is feasible. The calculation method used in this article and the conclusions achieved from the analysis could provide a new idea in the ventilation system design of marine engine room and a reference in equipment arrangement.

KEY WORDS: intelligent ship design; marine engine room; velocity field; temperature field; computational fluid dynamics; numerical simulation

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