An approach for the thermal analysis of internal combustion engines’ exhaust valves
•Exhaust valve is subject to thermal loading due to high temperature and pressure.•Exhaust valve is subdivided to several zones to isolate the effect of each part.•Heat transfer for each subdivision is evaluated during engine operating cycle.•Temperature maps through valves allows identifying region...
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| Published in | Applied thermal engineering Vol. 102; pp. 1095 - 1108 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
05.06.2016
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1359-4311 |
| DOI | 10.1016/j.applthermaleng.2016.03.105 |
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| Abstract | •Exhaust valve is subject to thermal loading due to high temperature and pressure.•Exhaust valve is subdivided to several zones to isolate the effect of each part.•Heat transfer for each subdivision is evaluated during engine operating cycle.•Temperature maps through valves allows identifying region exposed to maximum temperature.
Intake and exhaust valves are important components of internal combustion engines, which are used to control the inflow and outflow of gases. Such valves are subject to thermal loading due to high temperature and pressure inside the cylinder that must tolerate the limit of material temperature for a sustainable and optimal operation. The present study constitutes a contribution to predict the temperature maps of intake and exhaust valves considering the real conditions of an engine operation. An adequate subdivision of the valve is used to better assess the effect of each part of the cylinder head. Therefore, the instantaneous heat transfer coefficient and adiabatic wall temperature for each subdivision are evaluated during the four-stroke of an engine. The average values of these parameters are calculated and introduced as boundary conditions in a finite element model implemented in the commercial code Ansys-CFX. To facilitate the simulations runs of the proposed model, APDL (ANSYS Parametric Design Language) code is developed to extract the thermal map. As an application, this methodology is used to highlight the temperature maps and to show the region of extreme temperature and heat flux in the aim of avoiding any damage. |
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| AbstractList | •Exhaust valve is subject to thermal loading due to high temperature and pressure.•Exhaust valve is subdivided to several zones to isolate the effect of each part.•Heat transfer for each subdivision is evaluated during engine operating cycle.•Temperature maps through valves allows identifying region exposed to maximum temperature.
Intake and exhaust valves are important components of internal combustion engines, which are used to control the inflow and outflow of gases. Such valves are subject to thermal loading due to high temperature and pressure inside the cylinder that must tolerate the limit of material temperature for a sustainable and optimal operation. The present study constitutes a contribution to predict the temperature maps of intake and exhaust valves considering the real conditions of an engine operation. An adequate subdivision of the valve is used to better assess the effect of each part of the cylinder head. Therefore, the instantaneous heat transfer coefficient and adiabatic wall temperature for each subdivision are evaluated during the four-stroke of an engine. The average values of these parameters are calculated and introduced as boundary conditions in a finite element model implemented in the commercial code Ansys-CFX. To facilitate the simulations runs of the proposed model, APDL (ANSYS Parametric Design Language) code is developed to extract the thermal map. As an application, this methodology is used to highlight the temperature maps and to show the region of extreme temperature and heat flux in the aim of avoiding any damage. |
| Author | Cerdoun, Mahfoudh Ghenaiet, Adel Carcasci, Carlo |
| Author_xml | – sequence: 1 givenname: Mahfoudh surname: Cerdoun fullname: Cerdoun, Mahfoudh organization: Laboratory of Thermal Power Systems, Applied Mechanics, Ecole Militaire Polytechnique, BP17 Bordj-el-Bahri, 16046 Algiers, Algeria – sequence: 2 givenname: Carlo orcidid: 0000-0003-1293-0814 surname: Carcasci fullname: Carcasci, Carlo organization: Department of Industrial Engineering, University of Florence, Via Santa Marta, 3, Florence, Italy – sequence: 3 givenname: Adel surname: Ghenaiet fullname: Ghenaiet, Adel organization: Laboratory of Energetics and Conversion Systems, Faculty of Mechanical Engineering, University of Sciences and Technology, Houari Boumediene, BP32 El-Alia, Bab-Ezzouar, 16111 Algiers, Algeria |
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| Cites_doi | 10.4271/650019 10.1115/IMECE2013-64610 10.1243/09544070JAUTO202 10.2514/3.60 10.4271/670931 10.4271/972995 10.4271/960273 10.1016/S0035-3159(96)80018-3 10.4271/700501 10.1016/0017-9310(69)90011-8 10.4271/2009-01-1122 10.1115/1.2824065 10.1115/1.3450685 10.1243/JMES_JOUR_1970_012_038_02 10.1016/j.apenergy.2010.09.018 |
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| Title | An approach for the thermal analysis of internal combustion engines’ exhaust valves |
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