摘要
KM48天然气发动机是在原重型柴油机平台上开发的,由于燃烧温度升高,热负荷增加,原机水套有可能不能满足冷却要求。据此,利用FLUENT软件对其冷却水套进行仿真和改进。结果表明,缸盖排气门侧的三角鼻梁区的冷却液流速仅为0.5～2m/s,不能满足冷却要求。为此提出了两种改善缸盖鼻梁区冷却效果的结构方案,仿真结果表明,在缸盖水套的排气门侧加一个面积为199mm2的上通道时,冷却液的流速可提高到2～2.5m/s,满足冷却要求。
KM48 natural gas engine is developed on the base of original heavy-duty diesel engine. Due to the going up of its combustion temperature and hence the increase in thermal load, the original water jacket no lon-ger meets the cooling requirements. For this, its water jacket is simulated and improved with FLUENT software. The results show that the flow rate of coolant in the triangular nose area at exhaust valve side of cylinder head is only 0. 5～2m/s, which can’t meet the cooling requirements. Therefore, two structural modification schemes are put for-ward to improve the cooling effects. The simulation results indicate that by adding an upper passage with an area of 199mm2 at the exhaust valve side of water jacket, the coolant flow rate there can increase to 2～2. 5m/s, meeting its cooling requirements.
出处
《汽车工程》
EI
CSCD
北大核心
2014年第7期833-837,共5页
Automotive Engineering
关键词
天然气发动机
仿真
缸盖水套
上通道
natural gas engine
simulation
cylinder head water jacket
upper passage
