New thermo-mechanical analysis of cylinder heads using a multi-field approach
New thermo-mechanical analysis of cylinder heads using a multi-field approach
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DOI：
10.1016/j.scient.2011.03.009
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发表时间：
2011-02
期刊：
影响因子：
1.4
通讯作者：
M. Fadaei;H. Vafadar;A. Noorpoor
中科院分区：
文献类型：
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作者：
M. Fadaei;H. Vafadar;A. Noorpoor
本文给出了天然气内燃机气缸盖的热力分析结果。研究结果对临界区过热危害的评估具有一定的指导意义。利用计算机辅助工程工具，建立了气缸盖和水套的三维几何模型。采用商用有限元程序和计算流体力学程序分别计算了气缸盖的机械应力细节和气缸和冷却夹套内的流动细节。一台六缸四冲程柴油发动机和一台火花点火天然气发动机在满载时的不同速度范围内进行了建模。通过柴油机模型的试验数据验证了最大允许气缸压力、输出功率、BMEP和BSFC等计算结果。计算结果与实验数据吻合较好。结果表明，阀桥的应力很高。气缸盖温度和输出功率与高应力测量的比较，通常超过弹性极限，在阀桥上发现。
The results of a thermo-mechanical analysis of a natural gas, internal combustion engine cylinder head are presented in this paper. The results are pertinent to the evaluation of overheating damage in critical areas. The three-dimensional geometries of the cylinder head and the water jacket were modeled by means of a computer-aided engineering tool. Commercial finite element and computational fluid dynamics codes were used to compute details of mechanical stress in the head and flow details in the cylinder and cooling jacket, respectively. A six-cylinder, four-stroke diesel engine and a spark-ignition natural gas engine were modeled over a range of speeds at full load. Computed results, such as maximum allowable cylinder pressure, output power, BMEP and BSFC, were validated by experimented data in the diesel engine model. The results were in good agreement with experimental data. The results show high stresses at the valve bridge. Cylinder head temperatures and comparison of output power with high stress measurements, often exceeding the elastic limit, were found at the valve bridge.