Combustion Chamber Temperature and Instantaneous Local Heat Flux Measurements in a Spark Ignition Engine

1993 ◽  
Author(s):  
T. K. Hayes ◽  
R.A. White ◽  
J. E. Peters
Keyword(s):  
Heat Flux ◽  
Combustion Chamber ◽  
Local Heat ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Flux Measurements ◽  
Chamber Temperature ◽  
Local Heat Flux

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.

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.

scholarly journals Thermal parameters determination of battery cells by local heat flux measurements

2014 ◽  
Vol 271 ◽  
pp. 48-54 ◽  
Author(s):  
K.A. Murashko ◽  
A.V. Mityakov ◽  
J. Pyrhönen ◽  
V.Y. Mityakov ◽  
S.S. Sapozhnikov
Keyword(s):  
Heat Flux ◽  
Local Heat ◽  
Thermal Parameters ◽  
Flux Measurements ◽  
Local Heat Flux ◽  
Battery Cells

High-Temperature Heat Transfer Investigations Using Heterogeneous Gradient Sensors

2010 ◽  
Author(s):  
Sergey Z. Sapozhnikov ◽  
Vladimir Yu. Mityakov ◽  
Andrey V. Mityakov ◽  
Andrey A. Snarskii ◽  
Maxim I. Zhenirovskyy
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
High Temperature ◽  
Power Plant ◽  
Thermal Power ◽  
Local Heat ◽  
Working Temperature ◽  
Metal Metal ◽  
Flux Measurements ◽  
Local Heat Flux

The local heat flux measurements are limited by low working temperature of the gradient heat flux sensors (GHFS) [1–3]. The novel heterogeneous sensors (HGHFS) made from metal-metal or metal-semiconductor layered composites (so-called anisotropic thermoelements) have high temperature level of 1300 K and more. Theory of the HGHFS allows to choose thickness and angle of inclination for the layers of composite, and to forecast volt-watt sensitivity. The sensitivity of metal-metal sensors is typically on the order of 0.02 to 0.5 mV/W, and it is much beyond when semiconductors are used. HGHFS are used for a first time for heat flux measurements in the furnace of the industrial boiler which is in operating of the Thermal Power Plant (fossil fuel power plant) in the city of Kirov (Russia). The local heat flux at the surface of refractory-faced water wall is measured in different regimes of operating. It is also shown that HGHFS may be used as indicator of furnace slugging. Small sizes (minimally 2×2×0.1 mm) and high working temperature of the HGHFS are useful for heat transfer investigations.

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
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