| 摘要:针对某四缸机排气歧管在可靠性试验中出现开裂故障,从铸造缺陷、化学成分、硬度及金相组织等方面进行分析,并提出了改进方案。用ABAQUS软件对原方案及改进方案进行了温度场和热应力计算分析,分析结果表明:排气歧管开裂故障系热应力过大造成。改进方案已得到试验验证。 |
| 关键词: 柴油机 排气歧管 改进设计 CFD |
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| Trouble Shooting on Exhaust Manifold Cracking of a 4-cylinder Diesel Engine |
| Li Xianghua |
| Yuchai Machinery Co., Ltd., Guangxi Yulin 537005 |
| Abstract:The exhaust manifold of a 4-cylinder engine cracked during reliability test. To deal with this failure, analysis on casting faults, chemical composition, hardness and metallographic structure were carried out, and improvement program was given. Simulation of exhaust manifold temperature field and thermo stress using ABAQUS software was carried out. The results showed that the cracking of the exhaust manifold was due to a high level of thermo stress. Through comparing calculation results of several different designs, an optimum design was chosen and later verified by test. |
| Key words: diesel engine exhaust manifold improvement design Computational Fluid Dynamics |
