The Simulation Analysis And Test On Cooling System Of Marine Engine

In order to meet the market demand for the high-speed engines with extensive power and expand the power range of our product marine engines,the6M33 C diesel engine for marine applications was developed based on the original 6M generation engine.Since the marine engines are able to take full advantage of the water resources at hand,water cooling is employed instead of air cooling,and the heat exchanger,intercooler,water pump,expansion tank are all integrated on the engine block.As a result,the cooling system design is of paramount importance during the engine development.The target of the 6M33 C prototype engine concerned,checking calculations were carried out of various engine components,including the water pump,heat exchanger,intercooler,thermostat and etc.,based on which a primary layout of the engine cooling system was proposed.3D simulation was conducted on the flow of the coolant water inside the water jacket,based on which the uniformity of flow was analyzed,and the flow rate and pressure distribution inside the jacket were obtained.The problems of high pressure loss,low fluid velocity in key regions and non-uniform flow distribution regarded,the entire engine was optimized via modification and improvement of the flow volume of the water pump,the layout of the intercooler and heat exchanger,the arrangement of the inlet and outlet water pipes,and the position of water outlet,after which the final design of the cooling system was accomplished.Performance and durability tests were carried out on the final version of 6M33 C engine.Results show that normal temperature can be achieved in all key regions.Satisfactory flow uniformity and inlet/outlet water temperature can be obtained,indicating excellent cooling performance.All components are proved reliable for the engine to operate at any condition.This study is focused on the development of the cooling system of the 6M33 C engine by using simulation and experimental approaches.It is hoped that the results can offer references to the design and optimization of the engine cooling system in the future.