Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
Volume 236, Issue 1, Pages 635-654Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0954406221996394
Keywords
Thermo-mechanical stress; heat transfer; exhaust valves; heat transfer coefficient
Categories
Ask authors/readers for more resources
This study numerically evaluated the effect of real thermo-mechanical boundary conditions on engine valves, finding that high thermal stresses near the stem guide port and seat may cause cracks or thermal fatigue damage. Understanding temperature distribution and thermal gradients will help manufacturers design exhaust valves better and enhance valve durability.
The valves of an internal combustion engine play an essential role in the automobiles and their surroundings significantly affect their thermo-mechanical behavior. The work aims to assess numerically the effect of the real thermo-mechanical boundary conditions on the valves by considering the actual complex surrounding. For this purpose, we have subdivided the valve into seven adequate zones. We have evaluated the average values of the transient heat transfer coefficient, the adiabatic wall temperature and the mechanical load at each subdivision are during the opening and the closing periods. A transient Finite Element Model under ANSYS APDL software is developed and simulations are carried out until reaching the steady state. The temperature distribution and the thermal stresses at each valve position is obtained and then analyzed. The main findings show that the stress intensity distribution is developed in the zones labelled stem guide port and seat local of large temperature gradients, which causes high thermal stresses responsible of cracks or thermal fatigue damage. In addition, knowing the temperature map, the thermal gradient and stress under actual conditions will surely help manufacturers to better design exhaust valve, avoid early failure and enhance the durability of valves.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available