Fuel design and management for the control of advanced compression-ignition combustion modes

Lü, Xingcai; Han, Dong; Huang, Zhen

doi:10.1016/j.pecs.2011.03.003

Cited by 487 publications

(188 citation statements)

References 163 publications

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“…The efficiency is improved as a consequence of the fast heat release obtained when the proper in-cylinder conditions are achieved, as well as the reduction in heat transfer (HT) losses due to the lower in-cylinder temperature peaks. In this sense, the well-known combustion concept based on fully premixed lean mixtures Homogeneous Charge Compression Ignition (HCCI) [3] [4] has been widely investigated.…”

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

101

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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

101

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“…It has been demonstrated its potential to produce virtually no soot or NOx emissions while maintaining high efficiency [1][2] [3], but in return, new challenges regarding combustion control [4] [5] and mechanical engine stress were also identified [6]. Thus, Bessonette et al [7] suggested that different in-cylinder reactivity is required for proper HCCI operation under different operating conditions.…”

Section: Homogeneous Charge Compression Ignition (Hcci) Is a Widely Imentioning

confidence: 99%

Effects of low reactivity fuel characteristics and blending ratio on low load RCCI (reactivity controlled compression ignition) performance and emissions in a heavy-duty diesel engine

Benajes

Molina

García

et al. 2015

Energy

126

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ElsevierBenajes Calvo, JV.; García Martínez, A.;Monsalve Serrano, J. (2015). Effects of low reactivity fuel characteristics and blending ratio on low load RCCI (reactivity controlled compression ignition) performance and emissions in a heavy-duty diesel engine. Energy. 90:1261Energy. 90: -1271Energy. 90: . doi:10.1016Energy. 90: /j.energy.2015.088.Effects of low reactivity fuel characteristics and blending ratio on low load RCCI (reactivity controlled compression ignition) performance and emissions in a heavy-duty diesel engine Energy, Volume 90, October 2015, Pages 1261-1271. http://dx.doi.org/10.1016/j.energy.2015 Jesús Benajes, Santiago Molina, Antonio García* and Javier Monsalve-Serrano CMT -Motores Térmicos, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain (*) Corresponding author: angarma8@mot.upv.es (Antonio García Martínez) AbstractThis work investigates the effect of low reactivity fuel characteristics and blending ratio on low load RCCI performance and emissions using four different low reactivity fuels: E10-95, E10-98, E20-95 and E85 (port fuel injected) while keeping constant the same high reactivity fuel: diesel B7 (direct injected). The experiments were conducted using a heavy-duty single-cylinder research diesel engine adapted for dual fuel operation. All tests were carried out at 1200 rev/min and constant CA50 of 5 CAD ATDC. For this purpose, the premixed energy was equal for the different blends and the EGR rate was modified as required, keeping constant the rest of engine settings. In addition, a detailed analysis of air/fuel mixing process has been developed by means of a 1-D spray model.Results suggest that in-cylinder fuel reactivity gradients strongly affect the engine efficiency at low load. Specifically, a reduced reactivity gradient allows an improvement of 4.5% in terms of gross indicated efficiency when the proper blending ratio is used. In addition, EURO VI NOx and soot emission levels are fulfilled with a strong reduction in CO and HC compared with the case of the higher reactivity gradient among the low and high reactivity fuel.

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“…On the other hand, LPG has similar characteristics with DME while it has 40% higher value of lower heating than that of DME. Therefore, adding LPG into DME as ignition inhibitor is the promising technology [12][13][14]. Since normal butane is main component of LPG, authors have conducted a modeling work on DME/n-Butane pre-mixture which shows that optimized mixing ratio has the potential to delay autoignition timing by reducing pressure rise rate (PRR).…”

Section: Introductionmentioning

confidence: 99%

A Study on the Autoignition Characteristics of DME–LPG Dual Fuel in the HCCI Engine

Jamsran

2016

Heat Transfer Engineering

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This study was investigated to examine the potential increase of engine power through the mixture of di-methyl ether (DME) and liquefied petroleum gas (LPG) on homogeneous charge compression ignition (HCCI) combustion. The effects of mixing ratio of DME/LPG in constant intake temperature were confirmed experimentally in a single cylinder diesel engine. A numerical analysis were conducted through the mixing model of DME and n-Butane for the detailed chemical kinetics using CHEMKIN-PRO to clarify the autoignition mechanism of constant combustion phasing. The results show that the increased amount of LPG reduces the low temperature heat release (LTHR) and activates the high temperature heat release (HTHR) which increases the in-cylinder pressure. Therefore, it has potential to raise the indicated mean effective pressure (IMEP) by appropriately changing the mixing ratio. Also, thermal efficiency was increased to 51.2% at the mixing ratio of 0.6. Finally, engine out emissions including total hydrocarbon (THC) and carbon monoxide (CO) were decreased by the change of mixing ratio. Numerical results agreed with experiment that the weakened low temperature oxidation by the increase of n-Butane amount. INTRODUCTIONThe HCCI engine is named as the candidate of next generation internal combustion engine with the high efficiency of the compression ignition (CI) engine and the very low emissions of the spark ignition (SI) engine. The known benefits of a HCCI engine are near-zero nitrogen oxides (NOx) and PM emissions. However, several items have to solve before its widespread production. Controlling the rate of energy release and pressure-rise at high loads have been main problems [1].There are many attempts made to overcome the problem of early ignition timing, which are making heterogeneous mixture or thermal stratification [2][3][4][5], adding cooled exhaust gas recirculation (EGR) [6], and mixing two different

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Fuel design and management for the control of advanced compression-ignition combustion modes

Cited by 487 publications

References 163 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

Effects of low reactivity fuel characteristics and blending ratio on low load RCCI (reactivity controlled compression ignition) performance and emissions in a heavy-duty diesel engine

A Study on the Autoignition Characteristics of DME–LPG Dual Fuel in the HCCI Engine

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