基于GT-Suite的冷却液流量对柴油机性能的影响研究  

Research on influence of coolant flow rate on diesel engine performance based on GT-Suite

作　　者：张博[1] 张萍[1] 曾凡明[1] 郭旭 ZHANG Bo;ZHANG Ping;ZENG Fan-ming;Guo Xu(College of Power Engineering, Naval Univ. of Engineering, Wuhan 430033, China;Naval Representative Office, Wuhu 241000, China)

机构地区：[1]海军工程大学动力工程学院,武汉430033 [2]海军某军事代表室,安徽芜湖241000

出　　处：《海军工程大学学报》2021年第2期64-70,共7页Journal of Naval University of Engineering

基　　金：国家部委基金资助项目(3020401030403);湖北省自然科学基金资助项目(2016CFB62)。

摘　　要：针对目前大部分船用柴油机冷却系统存在的冷却过度问题,建立了柴油机工作过程-燃烧室-冷却系统耦合仿真模型。与单纯的柴油机冷却系统仿真模型相比,耦合仿真模型考虑了缸内燃烧放热与燃烧室壁面、燃烧室壁面与冷却系统的双向传热影响,仿真计算过程与实机运行状态更加贴近,试验证明了耦合仿真模型的精确性。基于仿真模型,计算分析了柴油机推进工况高、中、低负荷下淡水泵转速变化对柴油机性能的影响。结果表明:在中、低负荷点,降低淡水泵转速,柴油机消耗率降低、热效率提高;在额定工况点,淡水泵转速为1900 r/min时,油耗率最低、热效率最高;在超负荷点,适当提高淡水泵转速,对柴油机的经济性和动力性有利。In view of the problem of excessive cooling in most marine diesel engine cooling systems,a coupling simulation model of diesel engine working process-combustion chamber-cooling system was established.Compared with the simple simulation model of diesel engine cooling system,the coupling model considers the two-way heat transfer effects between combustion heat release in cylinder and combustion chamber walls,as well as combustion chamber walls and cooling system.The simulation process is closer to the running state of real diesel engine,and the accuracy of the coupling simulation model is proved by experiment.Based on the simulation model,the influence of the speed change of fresh water pump on the performance of diesel engine was calculated and analyzed under high,medium and low load points of diesel engine propulsion condition.The results show that:at the middle and low load points,with the speed of fresh water pump reducing,the consumption rate of diesel engine is reduced,and the thermal efficiency is improved;at the rated working point,when the speed of fresh water pump is 1900 r/min,the fuel consumption rate is the lowest and the thermal efficiency is the highest;at the overload point,the fuel consumption rate is the lowest and the thermal efficiency is the highest.It is beneficial to the economy and power of diesel engine to increase the speed of fresh water pump properly.

关 键 词：耦合仿真 冷却系统 油耗率 有效功率 缸盖温度 

分 类 号：TJ630[兵器科学与技术—武器系统与运用工程]