Exhaust Valve Temperature - A Theoretical and Experimental Investigation

Stotter, A.; Woolley, K. S.; Ip, E. S.

doi:10.4271/650019

Cited by 16 publications

(8 citation statements)

References 1 publication

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“…where the factor 'a' is a function of lift/diameter ratio and situated between 0.025 and 0.375. Stotter et al 5 have given the Nusselt number for the seat region as follows…”

Section: Valve-seatmentioning

confidence: 99%

“…Based on simplified laboratory test rigs, a lot of researchers tried to find correlations describing the heat transfer around the valve; however, their major drawbacks are the ignorance of the real operating conditions. Stotter et al 5 used two empirical equations for the turbulent pipe flow to estimate the heat transfer to the seat region and the remaining of the valve surface. Woschni, 6 after considering only the seat, applied the equation for turbulent heat transfer in the entrance region of two-dimensional (2D) channel.…”

Section: Introductionmentioning

confidence: 99%

“…However, Annand and Lanary 7 estimated heat transfer coefficient (HTC) around a whole idealized poppet-type valve. The correlations developed in previous studies 5 –7 ignored the engine load, fluid cooling and spark timing effects and tiled some real conditions surrounding the valve. The one-dimensional (1D) approach developed in this article is based on the previously published and validated empirical data applied on specified exhaust valve area in addition to the basic heat transfer formulations.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of unsteady heat transfer of internal combustion engines’ exhaust valves

Cerdoun

Carcasci

Ghenaiet

2017

International Journal of Engine Research

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This study is concerned with the analyses of heat transfer through an exhaust valve considering the real unsteady effects during the cycle of an internal combustion engine and to identify the factors and parameters affecting the heat transfer. The valve is segmented into several zones to facilitate incorporating the boundary conditions and evaluating the heat transfer coefficient and the adiabatic wall temperature based on the finite element method. The unsteady simulations were carried out using ANSYS-APDL for the proposed thermal model. The effect of lubricating oil and the contact resistance between guide and engine block and the thermal contact between exhaust valve and seat are included, as well as the differential displacement of both the guide and engine block walls due to high working temperature. The averaged values of heat transfer coefficient and adiabatic wall temperature used in the boundary conditions are shown to underestimate the temperature maps. The cyclic boundary conditions required more run time to reach the steady state and allowed better monitoring of the thermal process. The thermal contact resistance has the main contribution in the zone of valve-seat, whereas the resistance of oil film between the guide and stem valve is shown to affect mainly heat transfer coefficient. The obtained maps of temperature reveal the locations of maximum temperatures in the exhaust valve.

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“…where the factor 'a' is a function of lift/diameter ratio and situated between 0.025 and 0.375. Stotter et al 5 have given the Nusselt number for the seat region as follows…”

Section: Valve-seatmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of unsteady heat transfer of internal combustion engines’ exhaust valves

Cerdoun

Carcasci

Ghenaiet

2017

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…But their major drawbacks are the ignorance of the real operation condition of such valves. Stotter et al [3] used separate forms of the empirical equations for turbulent pipe flow to estimate the heat transfer to the seat region by and the remaining region of the valve surface where and represent the valve lift and diameter, respectively. Annand and Lanary [4] focused their study on the measuring of the end thrust on a valve model.…”

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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“…Any reduction in exhaust-valve peak temperature with the sodium-, water-and lithium-filled exhaust valves (superconductive valves) is at the expense of a greatly increased temperature level of the valve stem and increased heat rejection requirements (Danis, 1973 Hires and Pochmara (1976) was formulated. The measured temperatures were used to verify the validity of the model and to make appropriate adjustments to the approximate heat transfer coefficients given by Danis (1973), Stotter, et al (1965), and Hires andPochmara (1976, 1977), (these are reproduced in Figure 2). The model, in conjunction with the measured temperatures, yielded approximate values of peak valve temperature and stem and seat heat rejection requirements for the various valves tested (Section 11.2.1).…”

Section: Exhaust Valvesmentioning

confidence: 99%

Hydrogen engine performance analysis. First annual report

Adt¹,

Swain²,

Pappas³

1978

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H 2 utilization Coefficient (HU) Less Than 100% Indicates the Presence of Unburned Hydrogen in the Exhaust Show the Good Agreement Between. Predic•ted and Measured Nondimensional H 2 utilization Coefficients Shows that ~ and Not Engine Speed is the Dominant Factor Influencing H 2 Utilization Coefficient Illustrates the Gains in H) Utilization Coefficient Made Possible by Charge Stratification Descriptions of Hydrogen-Fueled Engines Tested by t.hR A11t.hnrs

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Exhaust Valve Temperature - A Theoretical and Experimental Investigation

Cited by 16 publications

References 1 publication

Analysis of unsteady heat transfer of internal combustion engines’ exhaust valves

Analysis of unsteady heat transfer of internal combustion engines’ exhaust valves

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

Hydrogen engine performance analysis. First annual report

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