| 摘要:针对某高功率密度船用大功率柴油机开发设计过程中，缸内热负荷增加导致缸套等受热零部件温度过高的情况，对冷却水腔结构进行局部优化。采用数值模拟的方法对改进前后的流场和温度场进行了对比分析，结果表明:优化后的冷却系统使整体流动阻力减小3%的同时，明显改善了缸盖和缸套关键区域的温度和热负荷情况，其中缸盖排气阀座位置最高温度下降30 ℃，第一道活塞环位置缸套平均温度下降8 ℃。 |
| 关键词: 船用柴油机 冷却系统；优化；仿真 |
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| Simulation Study on Optimization of High Power Density Marine DieselEngine Cooling System |
| Lu Chuanrong,Li Jia,Miao Weichi,Zhang Guoyong |
| Naval Deputy Office of Shanghai Marine Diesel Engine Research Institute, Shanghai 201108 |
| Abstract:Aiming at the phenomenon that the increase of thermal loads in the cylinder of high power density marine diesel engine causes overheating of cylinder liner and other parts in the development and design process, the cooling chamber was partially optimized. The flow field and temperature field before and after the optimization were compared by using simulation method. The results showed that the optimized cooling system not only reduced the total flow resistance by 3%, but also substantially decreased the temperature and thermal loads of cylinder head, cylinder liner and other key components. The highest temperature at the exhaust valve seat was decreased by 30 ℃, and the average temperature at the first piston ring was decreased by 8 ℃. |
| Key words: marine diesel engine cooling system optimization simulation |
