Numerical comparison of combustion characteristics and cost between hydrogen, oxygen and their combinations addition on natural gas fueled HCCI engine

Moradi, Jamshid; Gharehghani, Ayat; Mirsalim, Mojtaba

doi:10.1016/j.enconman.2020.113254

Cited by 34 publications

(10 citation statements)

References 38 publications

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“…In the way of using alternative fuel mixtures in RCCI engines, Moradi et al, in 2020 investigated hydrogen addition influences on a NG/diesel RCCI engine, and they observed that hydrogen addition reduces unburned hydrocarbons (UHC) and carbon dioxides (CO 2 ) while increasing nitrogen oxides (NO x ) [14]. These results were also obtained in Kakoee et al's investigations on hydrogen additions [2,3].…”

Section: Introductionmentioning

confidence: 88%

Numerical Investigation of an RCCI Engine Fueled with Natural Gas/Dimethyl-Ether in Various Injection Strategies

et al. 2021

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Reactivity control compression ignition engines illustrated suitable abilities in emission reduction beside high thermal efficiency. In this research, nine various direct fuel injection strategies were studied numerically: three cases with single injection strategy and six cases with split injection and different start of injection (SOI). In all simulated cases, equivalence ratio kept constant (i.e., 0.3). Among various strategies, single injection showed higher IMEP as a factor of efficiency with about 5.39 bar that occurred at SOI=60 before top dead center (bTDC), while lower efficiency was observed for split injection case with 50%-50% injections of fuel in each injection stage. Start of combustion (SOC), burn duration and CA50 as factors for combustion characteristics were affected with SOI changes. In single SOI strategies, more advanced injection caused more advanced SOC where there was about 1.3 CAD advancing from 40 to 80 bTDC injection. Spilt SOI showed more advanced SOC, which, also more advanced, was allocated to 50%-50%split injection strategy. There was also the same trend in CA50 changes during change in SOI. Burn duration variations were insignificant and all of them approximately close to 4.5 CAD. According to the emissions researched in this study (Nitrogen Oxides (NOx), monoxide carbon (CO) and unburned hydro carbons (UHC)), all of these pollutants are below euro six diesel standards. Contours of emissions show that there were appropriate SOI for each case study, which were 45 degree bTDC for single strategy, 48 degree bTDC for 80%-20% mass injection and 70 degree bTDC for 50%-50% cases.

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Section: Introductionmentioning

confidence: 88%

Numerical Investigation of an RCCI Engine Fueled with Natural Gas/Dimethyl-Ether in Various Injection Strategies

et al. 2021

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“…Furthermore, inlet air preheating is necessary to promote the autoignition of HCCI engine fuel. The addition of hydrogen on HCCI engines fueled with natural gas does not change the operating range much however, 30% oxygen and its combination increase the operating range by 48% and 40.19%, respectively 74 . The addition of hydrogen starts SOC early and reduces the chance of ignition delay and localized combustion.…”

Section: Combustion Of Hydrogen In the Presence Of Different Pilot Fu...mentioning

confidence: 99%

“…Variation of cylinder pressure and ROHR under different intake and coolant temperatures with the same 50% burn point. 74 T A B L E 5 SWOT analysis of intake temperature on HCCI engines. -By retarding the ignition timing, CO and HC emissions will be increased [46,48,59] Abbreviations: HRR, heat release rate; IMEP, indicated mean effective pressure; SWOT, strength, weaknesses, opportunities, and threat.…”

Section: Effect Of Speed Of the Enginementioning

confidence: 99%

“…The addition of hydrogen on HCCI engines fueled with natural gas does not change the operating range much however, 30% oxygen and its combination increase the operating range by 48% and 40.19%, respectively. 74 The addition of hydrogen starts SOC early and reduces the chance of ignition delay and localized combustion. The effect on the advancement of SOC is more for oxygen addition than that of hydrogen addition.…”

Section: Effect Of Percentage Induction Of Hydrogenmentioning

confidence: 99%

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A comprehensive review into the effects of different parameters on the hydrogen‐added HCCI diesel engine

Das,

Debnath,

Negi

et al. 2023

Energy Science & Engineering

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The current study presents research investigations and developments related to the homogeneous charge compression ignition (HCCI) engine. Research investigations and recent advances, including the role of various operating conditions on HCCI engine combustion phenomena, emissions, and performance, are discussed. There is growing research interest in investigating HCCI engines with diesel fuel to study combustion, emissions, and performance characteristics due to their association with low NOx emissions. In the published literature, research investigations are also conducted with different fuels ranging from biomass to diesel to gasoline in the HCCI engine showing its capability for utilizing various fuels in coming years. The challenges associated with HCCI combustion are reviewed, and the details of excessive carbon monoxide and unburnt hydrocarbon emissions are discussed. The major parameters affecting the hydrogen addition in HCCI diesel engines are also discussed. Overall, adding hydrogen to a diesel‐fueled HCCI engine improves combustion phasing and can potentially increase thermal efficiency while lowering emissions. In addition, the strength, weaknesses, opportunities, and threat analysis is provided and discussed thoroughly.

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“…Using environmentally friendlier devices is one of the most important approaches to have a green atmosphere for the next decades. Homogeneous charge compression ignition (HCCI) engines are considered as more e cient and cleaner engines than both conventional types, spark ignition (SI) and compression ignition (CI), in the engine industry [1].…”

Section: Introductionmentioning

confidence: 99%

The Start of Combustion Prediction for Methane-Fueled HCCI Engines: Traditional vs. Machine Learning Methods

Namar

Jahanian

Köten

2022

Mathematical Problems in Engineering

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In this work, 11 regression models based on machine learning techniques were employed to provide a fast-response and accurate model for the prediction of the start of combustion in homogeneous charge compression ignition engines fueled with methane. These regression models are categorized into linear and nonlinear types. Although the robust random sample consensus (RANSAC) model is a nonlinear type as well as SAM (simple algebraic model), the prediction accuracy is enhanced from 89.3% to 98.4%. Such accuracy is also achieved for the linear models, namely, ordinary least squares, ridge, and Bayesian ridge models. Indeed, due to the linear hypothesis (the correlation for the start of combustion prediction), the presented models have an acceptable response time to be used in real-time control applications like the electronic control units of the engines.

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Numerical comparison of combustion characteristics and cost between hydrogen, oxygen and their combinations addition on natural gas fueled HCCI engine

Cited by 34 publications

References 38 publications

Numerical Investigation of an RCCI Engine Fueled with Natural Gas/Dimethyl-Ether in Various Injection Strategies

Numerical Investigation of an RCCI Engine Fueled with Natural Gas/Dimethyl-Ether in Various Injection Strategies

A comprehensive review into the effects of different parameters on the hydrogen‐added HCCI diesel engine

The Start of Combustion Prediction for Methane-Fueled HCCI Engines: Traditional vs. Machine Learning Methods

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