某艇用发动机冷却系统分析及优化

Analysis of the cooling system for a marine engine and its optimization

为解决某高速艇用发动机水温高、中冷后气温高及变速箱润滑油温高的问题,进行故障艇系泊试验、航行试验及首台样艇测试分析,排查故障原因;利用Creo三维设计软件提取管路流体域,导入Simerics MP+软件进行模型处理及参数设置,建立海水冷却系统仿真模型,设计不同管路方案,进行压降分析。优化海底门、海水管路、海水过滤器结构,进行系泊试验与航行试验验证。结果表明:发动机水温高的根本原因是海水泵前管路压降大;将海底门、海水管路、海水过滤器直径由65 mm增大为80 mm,可以降低该艇冷却系统海水泵前管路压降,发动机水温、中冷后气温和变速箱润滑油温都在合理范围内,解决故障问题。

In order to solve the high temperature problems of cooling water,intercooling intake gases and lubricating oil for a high-speed boat,mooring tests,navigation tests,and testing analysis of the first sample boat are conducted to identify the source of the problem.The fluid domain of the pipeline is extracted using Creo software,and then imported into Simerics MP+software for model processing and parameter settings,a simulation model of the seawater cooling system is established.Pressure drop of different pipeline schemes is analysed.The structure of the sea gate,seawater pipeline and seawater filter are optimized and validated by mooring and navigation tests.The results indicate that the main cause of high temperature is the large pressure drop in the pipeline before the seawater pump.Increasing the diameter of the sea gate,seawater pipeline,and seawater filter from 65 mm to 80 mm could reduce the pressure drop in the seawater pump front pipeline of the ship′s cooling system,and keep the engine water temperature,intercooling temperature,and gearbox lubricating oil temperature within a reasonable range.