Temperature and Heat Flux Measurements in a Spark Ignition Engine

2000 ◽  
Author(s):  
C. R. Stone ◽  
E. P. Lim ◽  
P. Ewart ◽  
G. Lloyd ◽  
R. B. Williams
Keyword(s):  
Heat Flux ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Flux Measurements

scholarly journals Local heat flux measurements in a hydrogen and methane spark ignition engine with a thermopile sensor

2009 ◽  
Vol 34 (24) ◽  
pp. 9857-9868 ◽  
Author(s):  
J. Demuynck ◽  
N. Raes ◽  
M. Zuliani ◽  
M. De Paepe ◽  
R. Sierens ◽  
...  
Keyword(s):  
Heat Flux ◽  
Local Heat ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Flux Measurements ◽  
Local Heat Flux ◽  
Thermopile Sensor

scholarly journals Transient Heat-Flux Measurements in the Combustion Chamber of a Spark-Ignition Engine

1982 ◽  
Vol 104 (1) ◽  
pp. 62-67 ◽  
Author(s):  
A. C. Alkidas ◽  
J. P. Myers
Keyword(s):  
Heat Flux ◽  
Combustion Chamber ◽  
Stoichiometric Composition ◽  
Spark Ignition ◽  
Volumetric Efficiency ◽  
Spark Ignition Engine ◽  
High Rate ◽  
Cycle Variation ◽  
Peak Heat Flux ◽  
Flux Measurements

Heat-flux measurements were obtained at several locations on the cylinder head and liner of a four-stroke, single-cylinder, spark-ignition engine. The variations of heat transfer with air-fuel ratio and volumetric efficiency were investigated. The magnitude of the heat flux was found to be highest at near-stoichiometric composition, whereas at either leaner or richer composition the heat flux decreased. An increase in volumetric efficiency from 40 to 60 percent resulted in an increase in peak heat flux of about 30 percent. The largest cycle-to-cycle variation in the measured heat flux occurred at the time of the initial high rate of heat flux. This is related to the cycle-to-cycle variation of flame propagation in the combustion chamber. Finally, the calculated amount of heat transferred to the walls of the combustion chamber during the closed portion of the engine cycle (intake valve closing to exhaust valve opening) agreed with the corresponding values obtained from the heat-flux measurements.

Heat Transfer Characteristics of a Spark-Ignition Engine

1980 ◽  
Vol 102 (2) ◽  
pp. 189-193 ◽  
Author(s):  
A. C. Alkidas
Keyword(s):  
Heat Flux ◽  
Engine Speed ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
High Rate ◽  
Time Of Arrival ◽  
Rate Of Increase ◽  
Peak Heat Flux ◽  
Flux Measurements ◽  
Transient Heat Flux

Transient heat flux measurements were obtained at four positions on the cylinder head of a four-stroke single-cylinder spark-ignition engine. Tests were performed for both fired and motored operation of the engine. The primary engine operational variable was engine speed. The results showed that the heat flux varies considerably with position of measurement. At fired conditions, the initial high rate of increase of heat flux at each position of measurement correlated with the calculated time of arrival of the flame at that position. Finally, as expected, the peak heat flux was found to increase with increased engine speed.

Unsteady in-cylinder heat transfer in a spark ignition engine: Experiments and modelling

2001 ◽  
Vol 215 (6) ◽  
pp. 747-760 ◽  
Author(s):  
D J Oude Nijeweme ◽  
J. B. W. Kok ◽  
C. R. Stone ◽  
L Wyszynski
Keyword(s):  
Boundary Layer ◽  
Heat Flux ◽  
Combustion Chamber ◽  
Energy Equation ◽  
Spark Ignition ◽  
Surface Heat ◽  
Spark Ignition Engine ◽  
Unexpected Result ◽  
Reynolds Analogy ◽  
Law Of The Wall

Instantaneous heat flux measurements have shown that, in the expansion stroke, heat can flow from the wall into the combustion chamber, even though the bulk gas temperature is higher than the wall temperature. This unexpected result has been explained by modelling of the unsteady flows and heat conduction within the gas side thermal boundary layer. This modelling has shown that these unsteady effects change the phasing of the heat flux, compared with that which would be predicted by a simple convective correlation based on the bulk gas properties. Twelve fast response thermocouples have been installed throughout the combustion chamber of a pent roof, four-valve, single-cylinder spark ignition engine. Instantaneous surface temperatures and the adjacent steady reference temperatures were measured, and the surface heat fluxes were calculated for motoring and firing at different speeds, throttle settings and ignition timings. To make comparisons with these measurements, the combustion system was modelled with computational fluid dynamics (CFD). This was found to give very poor agreement with the experimental measurements, so this led to a review of the assumptions used in boundary layer modelling. The discrepancies were attributed to assumptions in the law of the wall and Reynolds analogy, so instead the energy equation was solved within the boundary layer. The one-dimensional energy conservation equation has been linearized and normalized and solved in the gas side boundary layer for a motored case. The results have been used for a parametric study, and the individual terms of the energy equation are evaluated for their contribution to the surface heat flux. It was clearly shown that the cylinder pressure changes cause a phase shift of the heat flux forward in time.

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