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Spark-ignition engine

About: Spark-ignition engine is a research topic. Over the lifetime, 4352 publications have been published within this topic receiving 66550 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, the use of isopropanol/gasoline blends as fuel in a 4-cylinder Spark Ignition engine with Multi-Point Fuel Injection System was investigated.

25 citations

Journal ArticleDOI
Y Li1, S Liu1, S-X Shi1, M Feng1, X Sui1 
01 Feb 2001
TL;DR: In this paper, the formation and break-up of the tumble in the cylinder were studied in a single-cylinder four-valve spark ignition engine using laser Doppler anemometry (LDA) measurements and multidimensional numerical simulations.
Abstract: The formation and break-up of the tumble in the cylinder were studied in a single-cylinder four-valve spark ignition engine using laser Doppler anemometry (LDA) measurements and multidimensional numerical simulations. The flow structure generated by the tumble break-up was also analysed using the cycle-resolved LDA data processing method. These results show that, during the intake stroke, two counter-rotating vortices are generated in the cylinder by the intake flow along the two sides of the cylinder. They then gradually evolve into the tumble vortex at the initial stage of the compression stroke. Tumble motion can be strengthened by increasing the intake flow going along the surface of the exhaust valves and/or decreasing the intake flow descending directly along the cylinder wall on the side of intake valves. Although a partially decayed tumble vortex still exists in the central part of the combustion chamber near the end of compression, in other parts of the combustion chamber the tumble disto...

25 citations

Journal ArticleDOI
TL;DR: In this article, the authors measured engine-out HC emissions in SI engine experiments in which the piston topland crevice size was changed systematically, and they found that the HC emissions have a one-to-one correspondence with the crevice sizes.
Abstract: Engine-out HC emissions were measured in SI engine experiments in which the piston topland crevice size was changed systematically. For a warmed-up engine, the HC emissions were found to be modestly sensitive to the piston crevice size-a 10% change in size results in approximately a 2% change in HC emissions. This low sensitivity is explained in terms of a crevice HC diffusion/oxidation model in the expansion process. When the piston crevice is sufficienlly small, however, the model shows that the HC emissions have a one-to-one correspondence with the crevice size.

25 citations

Journal ArticleDOI
TL;DR: In this paper, an established stochastic reactor model (SRM) previously used to examine homogeneous charge compression ignition (HCCI) combustion has been extended by spark initiation, flame propagation and flame termination sub-models in order to simulate combustion in SI engines.

25 citations

Journal ArticleDOI
TL;DR: In this paper, the authors developed an original theoretical formulation for the estimation of the optimal combustion phase, under some simplifying hypothesis, and evaluated the influence of the combustion duration, the heat release law, of heat transfer to the combustion chamber walls, and of mechanical friction losses.
Abstract: It is well known that the spark advance is one of the most important parameters influencing the efficiency of a spark ignition engine. A change in this parameter causes a shift in the combustion phase, whose optimal position, with respect to the piston motion, implies the maximum brake mean effective pressure for given operative conditions. The best spark timing is usually estimated by means of experimental trials on the engine test bed or by means of thermodynamic simulations of the engine cycle. In this work, instead, the authors developed, under some simplifying hypothesis, an original theoretical formulation for the estimation of the optimal combustion phase. The most significant parameters involved with the combustion phase are taken into consideration; in particular, the influence of the combustion duration, of the heat release law, of the heat transfer to the combustion chamber walls, and of the mechanical friction losses is evaluated. The theoretical conclusion, experimentally proven by many authors, is that the central point of the combustion phase (known as the location of the 50% of mass fraction burnt, here called MFB50) must be delayed with respect to the top dead center as a consequence of both heat exchange between gas and chamber walls and friction losses.

25 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202388
2022168
2021201
2020168
2019211
2018211