Full-cycle firing simulation of a pent-roof spark-ignition engine with visualization of the flow structure, flame propagation and relative heat flux

2000 ◽  
Vol 214 (8) ◽  
pp. 957-971
Author(s):  
J C Henson ◽  
W Malalasekera
Keyword(s):  
Heat Flux ◽  
Flow Structure ◽  
Flame Propagation ◽  
Spark Ignition ◽  
Spark Ignition Engine

Characterization of an in-cylinder flow structure in a high-tumble spark ignition engine

2004 ◽  
Vol 5 (5) ◽  
pp. 375-400 ◽  
Author(s):  
Y Li ◽  
H Zhao ◽  
B Leach ◽  
T Ma ◽  
N Ladommatos
Keyword(s):  
Flow Structure ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Cylinder Flow

Investigation of Flame Propagation Description in Quasi-Dimensional Spark Ignition Engine Modeling

2018 ◽  
Author(s):  
Simon Malcher ◽  
Michael Bargende ◽  
Michael Grill ◽  
Ulrich Baretzky ◽  
Hartmut Diel ◽  
...  
Keyword(s):  
Flame Propagation ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Engine Modeling

Swirl effect on the flame propagation at idle in a spark ignition engine

2000 ◽  
Vol 14 (12) ◽  
pp. 1412-1420 ◽  
Author(s):  
Shin Hyuk Joo ◽  
Kwang Min Chun ◽  
Younggy Shin
Keyword(s):  
Flame Propagation ◽  
Spark Ignition ◽  
Spark Ignition Engine

scholarly journals Early flame propagation in a spark-ignition engine measured with quasi 4D-diagnostics

2015 ◽  
Vol 35 (3) ◽  
pp. 3829-3837 ◽  
Author(s):  
B. Peterson ◽  
E. Baum ◽  
B. Böhm ◽  
A. Dreizler
Keyword(s):  
Flame Propagation ◽  
Spark Ignition ◽  
Spark Ignition Engine

Numerical Investigation of Fuel Property Effects on Mixed-Mode Combustion in a Spark-Ignition Engine

2019 ◽  
Author(s):  
Chao Xu ◽  
Pinaki Pal ◽  
Xiao Ren ◽  
Sibendu Som ◽  
Magnus Sjöberg ◽  
...  
Keyword(s):  
Heat Release ◽  
Flame Propagation ◽  
Heat Release Rate ◽  
Release Rate ◽  
Octane Number ◽  
Mixed Mode ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Chemical Effect ◽  
Auto Ignition

Abstract In the present study, mixed-mode combustion of an E30 fuel in a direct-injection spark-ignition engine is numerically investigated at a fuel-lean operating condition using multidimensional computational fluid dynamics (CFD). A fuel surrogate matching Research Octane Number (RON) and Motor Octane Number (MON) of E30 is first developed using neural network based non-linear regression model. To enable efficient 3D engine simulations, a 164-species skeletal reaction mechanism incorporating NOx chemistry is reduced from a detailed chemical kinetic model. A hybrid approach that incorporates the G-equation model for tracking turbulent flame front, and the multi-zone well-stirred reactor model for predicting auto-ignition in the end gas, is employed to account for turbulent combustion interactions in the engine cylinder. Predicted in-cylinder pressure and heat release rate traces agree well with experimental measurements. The proposed modelling approach also captures moderated cyclic variability. Two different types of combustion cycles, corresponding to purely deflagrative and mixed-mode combustion, are observed. In contrast to the purely deflagrative cycles, mixed-mode combustion cycles feature early flame propagation followed by end-gas auto-ignition, leading to two distinctive peaks in heat release rate traces. The positive correlation between mixed-mode combustion cycles and early flame propagation is well captured by simulations. With the validated numerical setup, effects of NOx chemistry on mixed-mode combustion predictions are investigated. NOx chemistry is found to promote auto-ignition through residual gas recirculation, while the deflagrative flame propagation phase remains largely unaffected. Local sensitivity analysis is then performed to understand effects of physical and chemical properties of the fuel, i.e., heat of evaporation (HoV) and laminar flame speed (SL). An increased HoV tends to suppress end-gas auto-ignition due to increased vaporization cooling, while the impact of HoV on flame propagation is insignificant. In contrast, an increased SL is found to significantly promote both flame propagation and auto-ignition. The promoting effect of SL on auto-ignition is not a direct chemical effect; it is rather caused by an advancement of the combustion phasing, which increases compression heating of the end gas.

scholarly journals Effect of Spark Advance on a Gas Run Automotive Spark Ignition Engine

2010 ◽  
pp. 42-49 ◽  
Author(s):  
Md Ehsan
Keyword(s):  
Natural Gas ◽  
Flame Propagation ◽  
Chemical Engineering ◽  
Engine Performance ◽  
Spark Ignition ◽  
Constant Load ◽  
Combustion Characteristics ◽  
Spark Ignition Engine ◽  
Optimum Performance ◽  
Automotive Engine

Petrol engines can run on natural gas, with little modification. The combustion characteristics of naturalgas is different from that of petrol, which eventually affects the engine performance. The performance of atypical automotive engine was studied running on natural gas, firstly at a constant speed for various loadsand then at a constant load for a range of speeds and results were compared with performance using petrol.Variation of the spark advance, consisting of centrifugal and vacuum advance mechanisms, wasinvestigated. Results showed some reduction in power and slight fall of efficiency and higher exhausttemperature, for natural gas. The air-fuel ratio for optimum performance was higher for gas than for petrol.This variation in spark requirement is mainly due to the slower speed of flame propagation for natural gas.For both the cases, the best power spark advance for natural gas was found to have higher values thanpetrol. This issue needs to be addressed during retrofitting petrol engines for running on natural gas.Journal of Chemical Engineering Vol.ChE 24 2006 42-49

scholarly journals Imaging and heat flux measurements of wall impinging sprays of hydrocarbons and alcohols in a direct-injection spark-ignition engine

Fuel ◽  
2012 ◽  
Vol 91 (1) ◽  
pp. 264-297 ◽  
Author(s):  
J. Serras-Pereira ◽  
P.G. Aleiferis ◽  
D. Richardson
Keyword(s):  
Heat Flux ◽  
Direct Injection ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Flux Measurements ◽  
Impinging Sprays ◽  
Direct Injection Spark Ignition

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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