Effects of hydrogen addition under lean and diluted conditions on combustion characteristics and emissions in a spark-ignition engine

Tahtouh, Toni; Halter, Fabien; Samson, Erwann; Mounaïm‐Rousselle, Christine

doi:10.1177/1468087411409309

Cited by 13 publications

(8 citation statements)

References 19 publications

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“…Besides in a previous study [26], it was shown, using two planes of visualization, that the flame mainly propagates in the horizontal direction especially after reaching the piston. Moreover, the work of Tahtouh et al [56,57] in the same optical engine showed that both direct visualization and tomography give the same trends regarding flame growth. Therefore, comparing the flame growth behavior for different air-fuel mixtures seems to be possible even if the two techniques will not give the same absolute values.…”

Section: Experimental Set-upmentioning

confidence: 91%

Fuel performances in Spark-Ignition (SI) engines: Impact of flame stretch

Bréquigny

Halter

Mounaïm‐Rousselle

et al. 2016

Combustion and Flame

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International audienceIn a context of decreasing pollutant emissions, the transport sector has to tackle improvements to the engine concept as well as fuel diversification. The use of these different fuels often has an impact on the combustion performance itself. In the case of Spark Ignition (SI) engines, efficiency is a function of the combustion speed, i.e. the speed at which the fresh air–fuel mixture is consumed by the flame front. Every expanding flame is subject to flame curvature and strain rate, which both contribute to flame stretch. As each air–fuel mixture responds differently to flame stretch, this paper focuses on understanding the impact of flame stretch on fuel performances in SI engines. Different air–fuel mixtures (different fuels or equivalence ratios) with similar unstretched laminar burning speeds and thermodynamic properties but different responses to stretch were selected. The mixtures were studied in a turbulent spherical vessel and in an optical engine using Mie-Scattering tomography. The combustion phasing was also investigated in both optical and all-metal single cylinder engines. Results show that flame stretch sensitivity properties such as Markstein length and Lewis number, determined in laminar combustion conditions, are relevant parameters that need to be taken into consideration to predict the global performance of fuels, either experimentally or for modeling simulation

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Section: Experimental Set-upmentioning

confidence: 91%

Fuel performances in Spark-Ignition (SI) engines: Impact of flame stretch

Bréquigny

Halter

Mounaïm‐Rousselle

et al. 2016

Combustion and Flame

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“…The result showed that at a fixed engine load, HC and CO emissions decrease with an increase in the hydrogen fraction in the intake mixture, while NO x emissions are mainly affected by the equivalence ratio and by the amount of dilution. 23 Modeling of IC engines is continuously growing and bases of the most of recent simulation investigations developed through zero-or one-dimensional (0D/1D) methods. [24][25][26] Although, in recent years, due to the vast calculative resources, studies have a desire to use threedimensional (3D) computational fluid dynamics (CFD) modeling.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of hydrogen addition on the performance and emission characteristics of compressed natural gas spark-ignition engine using response surface methodology and multi-objective desirability approach

Boodaghi

Etghani

Sedighi

2020

International Journal of Engine Research

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Today, the demand for higher output efficiencies, lower fuel consumption, and ever reduced emissions has been rising. Due to its availability, one promising alternative is the applying of hydrogen in internal combustion engines. In this study, the initial efforts concentrated on combine relationships of input and output parameters of hydrogen compressed natural gas spark-ignition engine. The quadratic regression models were conducted for all six responses: torque, carbon monoxide, brake-specific fuel consumption, methane, nitrogen oxides, and total hydrocarbon through response surface methodology and tested for adequacy by analysis of variance. The multi-objective desirability approach employed for the optimization of input variables, namely, the hydrogen compressed natural gas ratio, excess air ratio ( λ), and ignition timing ( θi). Also, two factors, that is, manifold absolute pressure and engine speed, were fixed at 105 kPa and 1600 r/min, respectively. Results indicate that the optimal independent input factors are equal to λ of 1.178, hydrogen compressed natural gas ratio of 25.98%, and θi of 18 °CA before top dead center. Also, the optimal combination of responses is as follows: brake-specific fuel consumption of 219.334 g/kWh, the torque of 395 N m, 30.189 g/kWh for nitrogen oxides, carbon monoxide equal to 5.093 g/kWh, total hydrocarbon of 0.633 g/kWh, and 0.572 g/kWh for methane. This study provided the significance of response surface methodology as an attractive technique for investigators for modeling. In this regard, the response surface methodology modeling and multi-objective desirability approach can be utilized to predict the emission and performance characteristics of the hydrogen compressed natural gas engines minutely.

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“…Flame speed is a sizing parameter to be considered in the design of energetic industrial systems such as IC engines [1,2] and gas turbines [3]. Indeed, this physicochemical property of a combustible mixture notably affects the heat release rate such as the flame stabilization.…”

Section: Introductionmentioning

confidence: 99%

Laminar flame speed determination at high pressure and temperature conditions for kinetic schemes assessment

Halter

Dayma

Serinyel

et al. 2021

Proceedings of the Combustion Institute

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Given the experimental difficulties, most of the available flame speed database is for relatively reduced thermodynamic conditions and for non-simultaneous variations of pressure and temperature. This limitation may be overpassed by using spherically expanding flames with the constant volume method. This methodology, introduced in the 30s by Lewis and von Elbe, requires the knowledge of the pressure evolution in the combustion chamber. It has been penalized for a long time because of the underlying assumptions and problems in flame instability detection. This method has been greatly renewed recently by Egolfopoulos following a coupled experimental/numerical approach integrating the effects of radiation and dissociation while maintaining moderate computing costs. In parallel with this study, we have worked on an alternative method providing a maximum of information for each test minimizing uncertainties. The current study uses a new experimental device allowing simultaneous recording of pressure and flame radius inside the chamber during the full combustion process. The direct use of these data over the whole flame propagation allows testing kinetic schemes over large pressure and temperature domains with good accuracy. These new experimental targets allowed the identification of key reactions needing improvements.

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Effects of hydrogen addition under lean and diluted conditions on combustion characteristics and emissions in a spark-ignition engine

Cited by 13 publications

References 19 publications

Fuel performances in Spark-Ignition (SI) engines: Impact of flame stretch

Fuel performances in Spark-Ignition (SI) engines: Impact of flame stretch

Numerical study of hydrogen addition on the performance and emission characteristics of compressed natural gas spark-ignition engine using response surface methodology and multi-objective desirability approach

Laminar flame speed determination at high pressure and temperature conditions for kinetic schemes assessment

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