Performance and emissions of a dual-fuel pilot diesel ignition engine operating on various premixed fuels

Yousefi, Amin; Birouk, Madjid; Lawler, Benjamin; Gharehghani, Ayat

doi:10.1016/j.enconman.2015.09.056

Cited by 60 publications

(11 citation statements)

References 40 publications

(24 reference statements)

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“…Advantages of natural gas include vast and geographically widespread resources, as well as some relevant combustion parameters such as a high octane number, a high anti-knock capability and low pollutant emissions, leading to a substantial reduction in carbon dioxide emissions, and possibly of NOx and particulate matter as compared to diesel and gasoline fueled IC engines [3,4,5,6]. On the other hand, natural gas has unfavorable combustion characteristics, such as a long ignition delay time, high auto-ignition temperature, low flame propagation speed for lean mixtures and poor lean burn capability.…”

Section: Introductionmentioning

confidence: 99%

Ignition characteristics of dual-fuel methane-n-hexane-oxygen-diluent mixtures in a rapid compression machine and a shock tube

Wang

Grégoire

et al. 2019

Fuel

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Ignition delay times of methane-n-hexane-oxygen mixtures were studied experimentally and numerically in a wide temperature range (640-2335 K) using both a rapid compression machine (RCM) and a shock tube (ST). The RCM results demonstrated a two-stage ignition and negative temperature coefficient (NTC) behavior. Increasing n-hexane concentration, pressure and equivalence ratio shortened the ignition delay time. For the ST experiments, the addition of 10% n-hexane (relative to methane) can reduce the ignition delay time dramatically. However, no further reduction effect can be achieved with increasing addition of n-hexane from 10% to 20%. In addition, increasing equivalence ratio reduces the effect of n-hexane addition on ignition delay time. Three detailed chemical mechanisms, CaltechMech, GalwayMech and LLNLMech, were evaluated based on a quantitative error analysis. LLNLMech and CaltechMech demonstrated the best performance in the RCM and ST temperature ranges, respectively. Chemical kinetic analyses showed that the addition of n-hexane to methane provides some chemical pathways not available for methane oxidation which result in the production of active radicals and eventually accelerate the ignition of the methane-oxygen mixtures. The crucial intermediate species for the ignition process are H 2 O 2 and H under RCM and ST conditions, respectively.

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Section: Introductionmentioning

confidence: 99%

Ignition characteristics of dual-fuel methane-n-hexane-oxygen-diluent mixtures in a rapid compression machine and a shock tube

Wang

Grégoire

et al. 2019

Fuel

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“…Imran shows that the NOx emission level is 53% less for all range of substitution and at all engine loads; the CO2 emission decreases by 25% at all engine loads due to the lower carbon content of the CNG; the HC emission increases 8 times at medium load and with 25% at high load [9]. Yousefi presents a 32% growth of incylinder maximum pressure and lower levels of NOx at highest substitution ratio; the CO emission rises because of the lack of oxygen as opposite to the conventional fuelling [10]. Mahla [11] presents improvements of the brake thermal efficiency, hydrocarbons and nitrous oxides emissions levels and negative effects on the ignition delay, in-cylinder pressure, smoke and CO emissions levels when using exhaust gases recirculation at a diesel engine fuelled with CNG.…”

Section: Introductionmentioning

confidence: 90%

Effects of CNG quantity on combustion characteristics and emissions of a dual fuelled automotive diesel engine

et al. 2020

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The paper reveals some experimental aspects of compressed natural gas (CNG) use in dual fuel mode at an automotive diesel engine. Brake specific energetic consumption, incylinder pressure, emissions and variability of indicated mean effective pressure are analysed at operating regime of 2000 rpm and 40% load. Using CNG as an alternative fuel reduces brake specific energetic consumption by 50%, the CO2 emission by 10% and sets the in-cylinder maximum pressure 13 bar higher comparative to diesel fuel fuelling. The smoke and hydrocarbons emissions and the variability of indicated mean effective pressure are affected by the injection of compressed natural gas into intake manifold: HC emission grows 24 times, the smoke number and the coefficient of variability of IMEP double their values. The use of compressed natural gas at an automotive diesel engine improves its energetic performances and combustion process, having positive effects on CO2 emission and fuel consumption.

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“…Diesel engines are extensively applied in transportation field and manufacturing industry due to their high thermal efficiency and reliable performance. However, diesel engines still have major problems of simultaneous reduce nitrogen oxide (NOx) and smoke emissions due to diffusion‐governing combustion mechanisms . Many new combustion modes such as homogenous charge compression ignition and dual‐fuel have been proposed to overcome this problem .…”

Section: Introductionmentioning

confidence: 99%

Effects of co‐combustion ratio on rapid combustion, cyclical variation, and emissions of a heavy‐duty diesel engine fueled with diesel‐methanol dual‐fuel

Zhang

2017

Env Prog and Sustain Energy

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Diesel-methanol dual-fuel (DMDF) combustion was achieved on a 6-cylinder, heavy-duty, turbocharged and common-rail diesel engine. In DMDF mode, the coalproduced methanol is induced to the upstream of the intake manifold and premixed with the fresh air to form a homogeneous methanol-air mixture and then ignited by directinjected pilot diesel in cylinder. The purpose of this study is to investigate the effects of co-combustion ratio (CCR) on the rapid combustion, cyclical variation and emissions of the DMDF engine. The experimental results show that CCR affect the rapid combustion (a) and knock tendency (b) greatly. With CCR increasing, both a and b increase significantly. The b exhibits an obviously large value under heavy load although CCR and a are small. At larger CCR, DMDF mode may generate a seriously cyclical variation and the coefficient of variation for indicated mean effective pressure (COV IMEP ) exhibits a relatively large value. However, with engine load increasing, the cyclical variation can be obviously decreased. It is also shown that both NOx and smoke emissions in DMDF mode present an obviously decrease trend, while CO and HC emissions exhibits an increase trend. A further reduction of NOx and smoke emissions can be obtained by increasing CCR, but CO and HC emissions are increased in this case.

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Performance and emissions of a dual-fuel pilot diesel ignition engine operating on various premixed fuels

Cited by 60 publications

References 40 publications

Ignition characteristics of dual-fuel methane-n-hexane-oxygen-diluent mixtures in a rapid compression machine and a shock tube

Ignition characteristics of dual-fuel methane-n-hexane-oxygen-diluent mixtures in a rapid compression machine and a shock tube

Effects of CNG quantity on combustion characteristics and emissions of a dual fuelled automotive diesel engine

Effects of co‐combustion ratio on rapid combustion, cyclical variation, and emissions of a heavy‐duty diesel engine fueled with diesel‐methanol dual‐fuel

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