Open AccessNew thermo-mechanical analysis of cylinder heads using a multi-field approach
Author(s) -
Mehdi Fadaei,
H. Vafadar,
Alireza Noorpoor
Publication year - 2011
Publication title -
scientia iranica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.299
H-Index - 51
eISSN - 2345-3605
pISSN - 1026-3098
DOI - 10.1016/j.scient.2011.03.009
Subject(s) - cylinder head , overheating (electricity) , cylinder , position sensing hydraulic cylinder , four stroke engine , ignition system , diesel engine , stress (linguistics) , mechanical engineering , finite element method , head (geology) , internal combustion engine , combustion , materials science , structural engineering , mechanics , engineering , combustion chamber , automotive engineering , physics , geology , linguistics , chemistry , philosophy , electrical engineering , organic chemistry , geomorphology , aerospace engineering , hydraulic cylinder
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