Development of a Gasoline Engine System Using HCCI Technology - The Concept and the Test Results

Yang, Jia; Culp, T.; Kenney, Thomas E.

doi:10.4271/2002-01-2832

Cited by 120 publications

(35 citation statements)

References 47 publications

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“…Despite their benefits, as in HCCI strategy, the use of diesel fuel [14] requires high levels of EGR when increasing engine load to achieve a proper combustion phasing [15], which reduces the thermal efficiency. In order to avoid this shortcomings, the use of fuels with lower reactivity [16][17] [18][19] [20] than diesel fuel (lower cetane number) such as gasoline has been proposed. The use of gasoline provides more flexibility to achieve the required extra mixing time at medium-high loads [21].…”

Section: Introductionmentioning

confidence: 99%

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

Desantes

Benajes

García

et al. 2014

Energy

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Several studies carried out with the aim of improving the RCCI concept in terms of thermal efficiency conclude that the main cause of the reduced efficiency at light loads is the reduced combustion efficiency. The present study used both a 3D computational model and engine experiments to explore the effect of the oxygen concentration and intake temperature on RCCI combustion efficiency at light load. The experiments were conducted using a single-cylinder heavy-duty research diesel engine adapted for dual fuel operation.Results suggest that it is possible to achieve an improvement of around 1.5% in the combustion efficiency with both strategies studied; the combined effect of intake temperature and in-cylinder fuel blending as well as the combined effect of oxygen concentration and incylinder fuel blending (ICFB). In addition, the direct comparison of both strategies suggests that the combustion losses trend is mainly associated to the in-cylinder equivalence ratio stratification, which is determined by the diesel to gasoline ratio in the blend since the injection timing is kept constant for all the tests. Moreover, the combined effect of the intake temperature and ICFB promotes a slight improvement in the combustion losses over the combined effect of the oxygen concentration and ICFB. KEYWORDS

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Section: Introductionmentioning

confidence: 99%

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

Desantes

Benajes

García

et al. 2014

Energy

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“…These new combustion modes are usually based on early injection timing strategies and on the reduction of the oxygen volume fraction using medium and high levels of exhaust gas recirculation (EGR), both strategies leading to a nearly homogeneous air-fuel mixture because of the long ignition delay decoupling the injection and combustion phases Within this framework, high injection pressures, high swirl levels and cooled EGR are commonly used [4], with the aim of delaying autoignition and reducing peak temperatures; this in turn requires higher boost pressures to achieve the required loads [1]. Additionally, when conventional (high cetane) diesel fuel is used in PPC combustion, important drawbacks appear related to the phasing of the heat release, which is extremely sensitive to the initial conditions of the mixture at the beginning of the compression stroke.…”

Section: Introductionmentioning

confidence: 99%

Gasoline effects on spray characteristics, mixing and auto-ignition processes in a CI engine under Partially Premixed Combustion conditions

López

García-Oliver

García

et al. 2014

Applied Thermal Engineering

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Recent research has shown that one of the paths to reduce pollutant emissions in diesel engines is to bring the operating conditions towards those of a gasoline engine, through homogeneous combustion and high octane fuels. Reduced soot, NOx, and fuel consumption are some of the benefits of using gasoline fuel combined with EGR in compression ignition engines in partially premixed combustion modes. Thus, a comparative study using diesel fuel and gasoline has been conducted focusing on the spray characteristics, mixing and autoignition process in these new combustion modes using a conventional diesel injection system. In this work, an experimental study has been carried out comparing the effects of penetration and cone angle under non-evaporating conditions for both fuels in a constant volume test rig. Besides, liquid length measurements and combustion process under partially premixed combustion (PPC) conditions in a single cylinder transparent engine have been done. The analysis of the results for both fuels shows no major differences on penetration and spray cone angle between them. Under vaporizing conditions, diesel spray exhibited a significantly longer liquid length than gasoline, due to the higher volatility of gasoline.In quantitative terms, liquid length was found to be 1.8 to 2.4 times longer for the diesel fuel. 1D spray model calculations confirmed the experimental results.The combustion process evaluation under PPC conditions shows differences in ignition delay and RoHR even under same thermodynamic conditions. Besides, Combustion images indicate differences in the autoignition and combustion process for diesel and gasoline fuels. Gasoline shows lower soot radiation and better combustion phasing.Differences in the mixing process evaluated with the 1D model show the mixing process is governed mainly by the fuel reactivity, the ignition delay and, to a lower extent, by the spray characteristics. The overall equivalence ratio obtained through the 1D model at the start of combustion is leaner for the gasoline case. This results agrees with a longer ignition delay for this fuel, due to lower fuel reactivity, and with the lower light intensity detected in the combustion images, where the leaner the equivalence ratio the lower the intensity.

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“…Much progress and many successes on single cylinder research type HCCI engines have been previously reported (Mirimoto et al 2001, Law and Allen 2002, Yang et al 2002. In most cases, these successes are focused on automotive power trains, an application that necessitates the ability of the engine to operate over a wide range of speed and load.…”

Section: Project Approachmentioning

confidence: 99%

Low Cost, High Efficiency, Ultra Low Nox Arice Solution Using Hcci Combustion

Flowers¹

2012

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LOW COST, HIGH EFFICIENCY, ULTRA LOW NOX ARICE SOLUTION USING HCCI COMBUSTION " P u b l i c I n t e r e s t E n e r g y R e s e a r c h ( P I E R ) P r o g r a m F I N A L P R O J E C T R E P O R T LOW COST, HIGH EFFICIENCY, ULTRA LOW NOX ARICE SOLUTION USING HCCI COMBUSTIONAPRILContract Number: 500-02-003Prepared for: California Energy CommissionAvtar Bining, Ph.D. Project ManagerMike Gravely Office Manager Energy Systems Research OfficeLaurie ten Hope Deputy Director RESEARCH AND DEVELOPMENT DIVISION Robert P. Oglesby Executive Director DISCLAIMERThis report was prepared as the result of work sponsored by the California Energy Commission. It does not necessarily represent the views of the Energy Commission, its employees or the State of California. The Energy Commission, the State of California, its employees, contractors and subcontractors make no warrant, express or implied, and assume no legal liability for the information in this report; nor does any party represent that the uses of this information will not infringe upon privately owned rights. This report has not been approved or disapproved by the California Energy Commission nor has the California Energy Commission passed upon the accuracy or adequacy of the information in this report. Legal Notice List of Figures List of Tables AbstractThis report documents the development of a Homogeneous Charge Compression Ignition engine for the Advanced Reciprocating Internal Combustion Engine Program of the California Energy Commission. The goal of this research project was to develop and demonstrate a homogeneous charge compression ignition internal combustion engine for stationary power generation applications meeting the advanced reciprocating internal combustion engine program efficiency and emissions goals, primarily the development of a 200 kilowatt engine operating at 45 percent efficiency with 0.015 grams/brake horse power hour nitrogen oxide emissions. While this project did not attain this goal, innovative solutions were developed to many of the technical barriers that prevent homogeneous charge compression ignition from being a practical combustion system for the stationary power generation marketplace. The project focused on converting a Caterpillar 6 cylinder engine model 3406 natural gas generator set to operate in natural gas homogeneous charge compression ignition mode. A key challenge of homogeneous charge compression ignition is control of combustion. A novel system for control of the engine was developed based on thermal management, where recovered heat from the engine exhaust was used to control intake air temperature. Controlling intake air temperature allows control of the timing of the homogeneous charge compression ignition combustion process, and a specially designed dual intake manifold system allowed for control of the engine on a cylinder by cylinder basis. Control of fuel air ratio is another significant technical issue in homogeneous charge compression ignition combustion, and is especially difficult with natural gas fuelled eng...

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Development of a Gasoline Engine System Using HCCI Technology - The Concept and the Test Results

Cited by 120 publications

References 47 publications

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

Gasoline effects on spray characteristics, mixing and auto-ignition processes in a CI engine under Partially Premixed Combustion conditions

Low Cost, High Efficiency, Ultra Low Nox Arice Solution Using Hcci Combustion

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