A study of performance and emissions of SI engine with a two-stage combustion system

2011 ◽  
Vol 32 (4) ◽  
pp. 453-471 ◽  
Author(s):  
Arkadiusz Jamrozik ◽  
Wojciech Tutak
Keyword(s):  
Combustion Process ◽  
Combustion System ◽  
Si Engine ◽  
Two Stage ◽  
Lean Mixture ◽  
Engine Efficiency ◽  
Excess Air ◽  
Stage Combustion ◽  
Performance And Emissions ◽  
Test Engine

A study of performance and emissions of SI engine with a two-stage combustion systemLean mixture burning leads to a decrease in the temperature of the combustion process and it is one of the methods of limiting nitric oxide emissions. It also increases engine efficiency. An effective method to correct lean mixture combustion can be a two-stage system of stratified mixture combustion in an engine with a prechamber. This article presents the results of laboratory research on an SI engine (spark ignition) with a two-stage combustion system with a cylinder powered by gasoline and a prechamber powered by propane-butane gas LPG (liquefied petroleum gas). The results were compared to the results of research on a conventional engine with a one-stage combustion process. The test engine fuel mixture stratification method, with a two-stage combustion system in the engine with a prechamber, allowed to burn a lean mixture with an average excess air factor equal to 2.0 and thus led to lower emissions of nitrogen oxides in the exhaust of the engine. The test engine with a conventional, single-stage combustion process allowed to properly burn air-fuel mixtures of excess air factors λ not exceeding 1.5. If the value λ > 1.5, the non-repeatability factorCOVLiincreases, and the engine efficiency decreases, which makes it virtually impossible for the engine to operate. The engine with a two-stage combustion process, working with λ = 2.0, theQin/Qtot= 2.5%, reduced the NOxcontent in the exhaust gases to a level of about 1.14 g/kWh. This value is significantly lower than the value obtained in a conventional engine, which worked at λ = 1.3 with comparable non-repeatability of successive cycles (about 3%) and a similar indicated efficiency (about 34%), was characterised by the emissions of NOxin the exhaust equal to 26.26 g/kWh.

scholarly journals Prechamber optimal selection for a two stage turbulent jet ignition type combustion system in CNG-fuelled engine

2019 ◽  
Vol 176 (1) ◽  
pp. 16-26 ◽  
Author(s):  
Ireneusz PIELECHA ◽  
Wojciech BUESCHKE ◽  
Maciej SKOWRON ◽  
Łukasz FIEDKIEWICZ ◽  
Filip SZWAJCA ◽  
...  
Keyword(s):  
High Speed ◽  
Internal Combustion Engines ◽  
Combustion Process ◽  
Optimization Methods ◽  
Turbulent Jet ◽  
Experimental Investigations ◽  
Combustion System ◽  
Two Stage ◽  
Lean Burn ◽  
High Speed Engine

Searching for further reduction of fuel consumption simultaneously with the reduction of toxic compounds emission new systems for lean-mixture combustion for SI engines are being discussed by many manufacturers. Within the European GasOn-Project (Gas Only Internal Combustion Engines) the two-stage combustion and Turbulent Jet Ignition concept for CNG-fuelled high speed engine has been proposed and thoroughly investigated where the reduction of gas consumption and increasing of engine efficiency together with the reduction of emission, especially CO2 was expected. In the investigated cases the lean-burn combustion process was conducted with selection of the most effective pre-combustion chamber. The experimental investigations have been performed on single-cylinder AVL5804 research engine, which has been modified to SI and CNG fuelling. For the analysis of the thermodynamic, operational and emission indexes very advanced equipment has been applied. Based on the measuring results achieved for different pre-chamber config-urations the extended methodology of polioptimization by pre-chamber selection and the shape of main chamber in the piston crown for proposed combustion system has been described and discussed. The results of the three versions of the optimization methods have been comparatively summarized in conclusions.

Development of a catalytic two-stage combustion system

AIChE Journal ◽  
1985 ◽  
Vol 31 (5) ◽  
pp. 767-772 ◽  
Author(s):  
M. Sadakata ◽  
T. Shigehisa ◽  
D. Kunii
Keyword(s):  
Combustion System ◽  
Two Stage ◽  
Stage Combustion

NOx Emissions From Industrial Boilers: Potential Control Methods

1974 ◽  
Vol 96 (1) ◽  
pp. 1-6 ◽  
Author(s):  
C. W. Siegmund ◽  
D. W. Turner
Keyword(s):  
Flue Gas ◽  
Two Stage ◽  
Potential Control ◽  
Excess Air ◽  
Stage Combustion ◽  
Utility Boilers ◽  
Industrial Boilers ◽  
Potential Methods ◽  
Further Development ◽  
Methods Of Control

Future regulations may limit emissions of NOx from industrial/commercial boilers as well as utility boilers. The potential methods of control for these boilers are the same as those for utility boilers—low excess air, flue gas recycle, and two stage combustion. Low excess air and flue gas recycle can control NOx from thermal fixation. Two stage combustion controls both thermal and fuel NOx. Further development work is needed to apply these combustion modification procedures to industrial/commercial boilers in which volumetric heat release rate is normally quite high.

Investigation of Engine Performance and Emission Characteristics of Si Engine Fuelled with Ethanol Blends by Numerical Simulation

2014 ◽  
Vol 1016 ◽  
pp. 597-601
Author(s):  
Ceyla Ozgur ◽  
Erdi Tosun ◽  
Tayfun Ozgur ◽  
Gökhan Tuccar ◽  
Kadi̇r Aydin
Keyword(s):  
Combustion Process ◽  
Engine Performance ◽  
Spark Ignition Engine ◽  
Emission Characteristics ◽  
Si Engine ◽  
Performance And Emission ◽  
Performance And Emissions ◽  
Ethanol Addition ◽  
Ethanol Blends ◽  
Engine Performance And Emissions

In this study the influences of ethanol addition to gasoline on an spark ignition engine performance and emissions were explored. AVL BOOST software was used to simulate the performance and emission characteristics of different ethanol-gasoline blends. The blended fuels contain 5%, 10% and 15% of ethanol by volume, and indicated as B95E5, B90E10, and B85E15, respectively. The results showed that ethanol addition to gasoline fuel improve combustion process, decrease CO emissions and reduce BSFC of the SI engine.

scholarly journals Theoretical analysis of air-fuel mixture formation in the combustion chambers of the gas engine with two-stage combustion system

2014 ◽  
Vol 62 (4) ◽  
pp. 779-790 ◽  
Author(s):  
A. Jamrozik ◽  
W. Tutak
Keyword(s):  
Theoretical Analysis ◽  
Ignition Time ◽  
Combustible Mixture ◽  
Mixture Composition ◽  
Combustion System ◽  
Mixture Formation ◽  
Two Stage ◽  
Gas Engine ◽  
Compression Stroke ◽  
Stage Combustion

Abstract The results of theoretical analysis of a mixture formation process during the compression stroke in a prechamber of the IC (internal combustion) gas engine with the stratified mixtures two-stage combustion system were presented in the paper. The course of excess air-fuel ratio changes in prechamber at ignition time λkz in function of degree of the mixture condensation during the compression stroke φ expressing quotient of a temporary cylinder and prechamber volume and maximal value of the volume were estimated. Research concerning λkz sensitivity on changes of rich combustible mixture composition delivered to the prechamber by the additional fuel supply system λko, mixture composition in cylinder _c and degree of filling a prechamber with the rich combustible mixture ξ were performed. According to numerical calculations it was proved that the real gas engine with the two stage combustion system at equal degree requires exact regulation of the three analysed values.

scholarly journals Effects of steam addition and/or injection on the combustion characteristics: A review

2019 ◽  
pp. 452-452
Author(s):  
Ashkan Sehat ◽  
Fathollah Ommi ◽  
Zoheir Saboohi
Keyword(s):  
Nitrogen Oxide ◽  
Energy Demand ◽  
Fossil Fuels ◽  
Nox Reduction ◽  
Combustion Process ◽  
Design Guidelines ◽  
The Other ◽  
Combustion System ◽  
Performance Parameters ◽  
Engine Efficiency

Due to increasing global energy demand and the fact that a major source of the required energy is generated from fossil fuels, the combustion process has turned into a topic of interest in converting fossil fuels to energy. An ideal combustion system is one that can combine high engine efficiency with low fuel consumption and low emissions. Increasing humidity is a technique used by researchers for influencing the combustion process. The present study aims to review previously conducted researches in this regard. Based on viewpoints of these researches, the reviewed studies were categorized into four groups: (1) the case studies used; (2) the methodology applied; (3) the design guidelines considered; and (4) the performance parameters studied. It can be concluded from the reviewed articles that nitrogen oxide (NOx) reduction is the most significant advantage of increasing humidity in the combustion process, and has led to the widespread use of this method. The other studied emissions either remained constant or their respective increases were negligible.

Reactivity Controlled Compression Ignition Performance With Renewable Fuels

2012 ◽  
Author(s):  
Scott J. Curran ◽  
James P. Szybist ◽  
Robert M. Wagner
Keyword(s):  
High Efficiency ◽  
Fuel Injection ◽  
Combustion Process ◽  
Renewable Fuels ◽  
Compression Ignition ◽  
Reactivity Controlled Compression Ignition ◽  
Engine Efficiency ◽  
Fuel Charge ◽  
Performance And Emissions ◽  
Ethanol Blends

Reactivity controlled compression ignition (RCCI) combustion makes use of in-cylinder blending of two fuels with differing reactivity to tailor the reactivity of the fuel charge for improved control of the combustion process. This approach has been shown in simulations and engine experiments to have the potential for high efficiency with very low NOX and particulate matter (PM) emissions. Previous multi-cylinder RCCI experiments have been completed to understand the potential of this approach under more real-world conditions in a light-duty multi-cylinder engine (MCE) with production viable hardware. MCE experiments explored fuel injection strategy, dilution levels, piston geometry (including compression ratio), and fuel properties. Many renewable fuels have unique properties which enable expanded operation of advanced combustion methods for higher engine efficiency and lower energy requirements for emissions control devices. This study investigates the effect that renewable gasoline and diesel fuel replacements have on the load-expansion of RCCI, performance and emissions. The study focuses on ethanol blends for replacement of gasoline as the port-injected fuel (PFI) and biodiesel blends as the replacement for the direct injected (DI) fuel.

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