Abstract: With the increase of the installed engine power and redundancy requirements, the specification of the engine room ventilation system has been expanded, imposing difficulties on the design and layout of the engine room. A compound engine room ventilation system is introduced by combining frequency conversion fans and water-cooled internal circulating system. The CFD method is utilized to simulate a ship under several basic working conditions, optimizing the parameters of engine room fans, the layout of engine room air coolers, and the nozzle angles of jet fans. The results show that the compound engine room ventilation system effectively reduces the specification of the engine room ventilation with improved economy and flexibility. It can provide a reference for the design of engine room ventilation system for similar vessels.

Key words: compound engine room ventilation, internal circulating cooling, CFD analysis, semi-submersible vessel

摘要： 随着船舶装机功率和冗余要求的提高,机舱通风系统的规格也随之提高,给系统设计和布置带来了一定困难。该文研究提出了1种结合变频风机与水冷内循环系统的复合机舱通风系统,并以某船为例,利用计算流体力学（computational fluid dynamics,CFD）仿真手段对几种基本工况进行了模拟研究,优化机舱风机参数、冷风机布置及射流风机喷嘴角度。仿真结果表明：采用复合机舱通风系统可有效降低机舱通风系统规格的同时,提高其经济性和灵活性,为类似船型机舱通风系统的设计提供了有益借鉴。

关键词: 复合机舱通风, 内循环冷却, CFD分析, 半潜船