黄振宇;罗金;幺红波;宋亚东;
1:奇瑞汽车股份有限公司发动机工程研究一院
摘要：在柴油机设计开发过程中,考虑到热负荷高、各缸孔间冷却均匀性差、缸盖鼻梁区出现热裂等现象的出现,本文对整机冷却水流速与换热进行模拟分析。通过模拟计算分析,得出冷却水在缸体进气侧从第一缸向第四缸流动过程中,流速与换热系数明显下降,这将会引起柴油机热负荷高、冷却均匀性差;喷油器和气门周边区域换热系数低,这将会是缸盖鼻梁区热裂的主要成因。针对上述设计开发过程中首先要考虑的潜在影响因素,本文提出了缸体水套设计优化方案、缸盖垫片优化设计方案;通过模拟计算的手段,得出本文提出的冷却系统优化设计方案,通过该方案的实施,有效降低产品设计完成后热负荷高、冷却均匀性差以及缸盖鼻梁区热裂等潜在失效风险。
关键词： 车用柴油机;;冷却;;模拟分析;;优化设计
Abstract: During the design of diesel
engine,considering of high heat load,bad cooling evenness of each cylinder
hole,and cylinder head nose being cracked.This paper gives a model analysis for
cooling water and heat changing.By model calculation analysis,when cooling
water flows into the forth cylinder from the first cylinder,water speed and
heat changing coefficient decreases,which would bring into high heat load,bad
cooling evenness,and low heat changing coefficient of injector and valve
areas,which is the most important reason of cylinder head nose cracking.The
paper put forward optimization design plan of cylinder water jacket and
cylinder head gasket,by model calculation,we got optimization design plan of
cooling system.,by which reduce heat load,bad cooling evenness,and cylinder
head nose areas cracking.
Keywords: Vehicle Diesel
Engine;Cooling;Model Analysis;Optimization Design
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Cooling System inInternal Combustion Engine”.Internal Combustion
Engine,1992(5).
[2]Jian Y.,Jim Covey,Daniel
D.Agnew.“Coolant-flowOptimization in a Racing Cylinder Block and Head Using
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[4]干勇,等.中国材料工程大典(第二卷).钢铁材料工程(上)第一版,化学工业出版社出版,2006.
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