Transient Thermal Analysis of Engine Exhaust Valve

Shojaefard, M. H.; Noorpoor, Alireza; Bozchaloe, D. A.; Ghaffarpour, M.

doi:10.1080/10407780590959943

Cited by 21 publications

(15 citation statements)

References 20 publications

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“…investigated parametrically how the convective heat transfer coefficients (HTCs) for the gas and coolant side vary with different engine operating parameters, such as the engine speed, compression ratio, excess air coefficient, combustion duration, inlet pressure, and temperature. Shojaefard et al [7]. studied transient thermal analysis of an exhaust valve by using the finite-element method.…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation by Models of Load and Spark Timing Effects on the In-Cylinder Heat Transfer of a SI Engine

Şanlı

Sayın

Gümüş

et al. 2009

Numerical Heat Transfer, Part A: Applications

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The aim of this study is to examine numerically the effects of spark timing and load parameters on the in-cylinder heat transfer of a SI engine by using experimental engine test data. For the investigation, a four-stroke, air-cooled, single-cylinder SI engine was tested at different spark timings and loads at a single engine speed of 2000 rpm. Woschni, Hohenberg, and Han models were employed to estimate the in-cylinder heat transfer coefficient in the case of different test conditions because of being favorable models on the SI engine operations. The evaluations show that the in-cylinder heat transfer characteristics of the air-cooled SI engine strongly depend on the load while they slightly depend on the spark timing.

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Section: Introductionmentioning

confidence: 99%

Numerical Evaluation by Models of Load and Spark Timing Effects on the In-Cylinder Heat Transfer of a SI Engine

Şanlı

Sayın

Gümüş

et al. 2009

Numerical Heat Transfer, Part A: Applications

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“…Todinson et al [8] presented a method basing on the average gas temperature during the engine cycle for assessing the maximum temperature of exhaust valves in internal combustion engines. Shojaefard et al [9] developed a methodology for transient thermal analysis of the exhaust. The model includes exhaust valve, seat, guide, and spring.…”

Section: Introductionmentioning

confidence: 99%

Effect Of The Engine Speed And Loading On The Heat Transfer Within Exhaust Valves

et al. 2019

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The aim of the present paper is to investigate numerically the heat transfer within exhaust valves by considering the actual boundary conditions provided from an internal combustion engine at differentload and speed. For this purpose, the valve is subdivided into seven adequate subdivisions to better assess the effect of each engine parts, therefore, an average value of the transient heat transfer coefficient (HTC) and the adiabatic wall temperature (AWT) for each subdivisions are evaluated during one cycle. These two parameters are introduced as boundary condition in a FEM model. The simulations are done at diverse engine regime, and therefore, the trend of the real boundary condition in term of HTC and AWT are given versus engine speed at different load. The findings show that the HTC increases linearly with engine speed however, the AWT decrease slightly at partial load and increase in the case of full engine load. The obtained model is used to highlight the temperature map, which will certainly help to avoid any damage to the exhaust valve.

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“…In contrary to the work done by Cerdoun et al, [15][16][17][18] in which the average of the heat transfer coefficient and the adiabatic wall temperature are taken during one engine cycle. In the present work and in order to assess well the effect of each period of the engine cycle, the averaging is taken at two periods (a period when the valve is closed and a period when the valve is open).…”

Section: Adopted Methodologymentioning

confidence: 97%

“…Prasad et al 1 carried out a numerical calculation based on finite difference approximations to calculate the temperature and thermal stress fields in a semi-adiabatic diesel engine exhaust valve. Shojaefard et al 18 developed a methodology to analyse the transient thermal load of exhaust valves. The model includes an exhaust valve, seat, guide, and spring.…”

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical stress analysis within a steel exhaust valve of an internal combustion engine

Fersaoui

Cerdoun

May

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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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.

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Transient Thermal Analysis of Engine Exhaust Valve

Cited by 21 publications

References 20 publications

Numerical Evaluation by Models of Load and Spark Timing Effects on the In-Cylinder Heat Transfer of a SI Engine

Numerical Evaluation by Models of Load and Spark Timing Effects on the In-Cylinder Heat Transfer of a SI Engine

Effect Of The Engine Speed And Loading On The Heat Transfer Within Exhaust Valves

Thermo-mechanical stress analysis within a steel exhaust valve of an internal combustion engine

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