高功率密度船用柴油机冷却系统优化仿真分析
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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℃。
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 ℃.
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 ℃.
引文
[1]朱建元.船舶柴油机[M].北京:人民交通出版社.2008.
[2]Kenji Okumura.CFD simulation by automatically generated tetrahedral and prismatic cells for engine intake duct and coolant flow in three days[C].SAE Paper 2000-01-0294.
[3]Jacoby Pierre,Xu Henry,Wang David.VTG turbocharging——a valuable concept for traction application[C].CIMAC,2013,Paper No.116.
[4]M.Cardone,A.Senatore,D.Buono,et al.A model for application of Chen's boiling correlation to a standard engine cooling system[C].SAE Paper 2008-01-1817.
[5]王希真,严兆大,周军.柴油机缸套热负荷评估的分析及实验研究方法[J].内燃机工程,2001.22(2):62-65.
[6]白敏丽,吕继组,丁铁新.六缸车用内燃机冷却系的流动与传热仿真[J].内燃机学报,2004,22(6):525-531.
[7]陶文铨.数值传热学[M].西安:西安交通大学出版社.2001.
[8]FLUENT INT.USERS'GUIDE[RJ.2001.
[9]ABAQUS INT.USERS'GUIDE[R].2008.
[2]Kenji Okumura.CFD simulation by automatically generated tetrahedral and prismatic cells for engine intake duct and coolant flow in three days[C].SAE Paper 2000-01-0294.
[3]Jacoby Pierre,Xu Henry,Wang David.VTG turbocharging——a valuable concept for traction application[C].CIMAC,2013,Paper No.116.
[4]M.Cardone,A.Senatore,D.Buono,et al.A model for application of Chen's boiling correlation to a standard engine cooling system[C].SAE Paper 2008-01-1817.
[5]王希真,严兆大,周军.柴油机缸套热负荷评估的分析及实验研究方法[J].内燃机工程,2001.22(2):62-65.
[6]白敏丽,吕继组,丁铁新.六缸车用内燃机冷却系的流动与传热仿真[J].内燃机学报,2004,22(6):525-531.
[7]陶文铨.数值传热学[M].西安:西安交通大学出版社.2001.
[8]FLUENT INT.USERS'GUIDE[RJ.2001.
[9]ABAQUS INT.USERS'GUIDE[R].2008.