Cycle-to-cycle variations of dual-fuel combustion in an optically accessible engine

Cheng, Qiang; Ahmad, Zeeshan; Kaario, Ossi; Larmi, Martti

doi:10.1016/j.apenergy.2019.113611

Cited by 21 publications

(4 citation statements)

References 37 publications

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“…For the dual fuel combustion, the chemical reaction of the incylinder gases is more complicate due to the addition of the methane. It was found that methane has a significant effect on the lowtemperature reactivity in pilot-fuel lean regions, which is considerably retarded leading to an overall increased ignition delay and lower pilotfuel mixture reactivity [28][29][30]. Nevertheless, little is known about the influence of methane on the processes of the ignition and flame propagation.…”

Section: /19/2016mentioning

confidence: 99%

“…Except this physical effect, the low-temperature chemical reaction is also discussed in previous studies. The study from LES simulation shows that the additional CH4 influences the chemical pathways and production/consumption rates of intermediate species such as OH, CH3, HO2 and early decomposition products of diesel such as RO2 [30].…”

Section: Fuel Injection Systemmentioning

confidence: 99%

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Simultaneous Visualization of Natural Luminosity and Chemiluminescence of Dual Fuel Combustion in an Optically Accessible Engine

Cheng

Ahmad

Kaario³

et al. 2020

SAE Technical Paper Series

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The engine fueled with methane/diesel is a promising and highly attractive operation mode due to its high performance-to-cost ratio and clean-burning qualities. However, the combustion process and chemical reactions in dual fuel combustion are highly complex, involving short transient pilot-fuel injection into the premixed gaseous fuel charge, autoignition, and combustion mode transition into premixed flame propagation. The motivation of the current investigation is to gain an insight into the combustion dynamics in dual fuel combustion engine based on chemical radicals and thermal radiation. The chemiluminescence (CL) and natural luminosity (NL) are expected to provide specific characteristics in combustion control and monitoring. To visualize the highly unsteady combustion process in terms of OH*, CH2O* radicals and natural luminous emissions, the band pass filters with 308nm, 330nm combined with an image doubler are employed to visualize the OH* and CH2O* CL simultaneously. High speed natural luminosity imaging is adopted to illustrate the effects methane lambda and pilot ratio on the ignition delay, luminous intensity and engine performance. Spectroscopy analysis based on OH*, CH2O* and NL was performed to study the chemical reactions in dual fuel mode.

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Section: /19/2016mentioning

confidence: 99%

Section: Fuel Injection Systemmentioning

confidence: 99%

Simultaneous Visualization of Natural Luminosity and Chemiluminescence of Dual Fuel Combustion in an Optically Accessible Engine

Cheng

Ahmad

Kaario³

et al. 2020

SAE Technical Paper Series

Self Cite

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“…Since these tend to be unstable in low load conditions, it is necessary to further study the combustions and explicitly the cycle-to-cycle variation. Previous studies on the cycle-to-cycle variation have been carried out by Cheng et al [20], however, the analysis focused on the spatial distribution of the flames and not on the overall flame area and different fuels. A different approach was carried out by Pasunurthi et al [21], who simulated the cycle-to-cycle variation and compared them to an experimental engine.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Combustion Cycle-to-Cycle Variation in an Optical Single Cylinder Dual-Fuel Engine

Lauterkorn¹,

Wang²,

Zhao³

2023

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">This study aims to improve the dual fuel combustion for low/zero carbon fuels. Seven cases were tested in a single cylinder optical engine and their ignition and combustion characteristics are compared. The baseline case is the conventional diesel combustion. Four cases are diesel-gas (compressed natural gas) dual-fuel combustion operations, and two cases are diesel-hythane combustion. The diesel fuel injection process was visualized by a high-speed copper vapour laser. The combustion processes were recorded with a high-speed camera at 10000 Hz with an engine speed of 1200 rpm. The high-speed recordings for each case included 22 engine cycles and were postprocessed to create one spatial overlapped average combustion image. The average combustion cycle images were then further thresholded and these images were then used in a new method to analyze the cycle-to-cycle variation in a dimensionless, for all cases comparable value. Furthermore, the ignition delay and heat release profile of each case are analyzed. The results showed the lowest deviation from the complete overlap for the pure Diesel case and the Hythane Cases since the flames are more concentrated in these. From these studies, it can be concluded that the cyclic variation for the pure diesel combustion is mostly caused by the different swirl speeds in the piston bowl. The diesel-gas dual-fuel combustion with earlier pilot injections have lower cyclic variation due to a wider spread of the combustible mixture. The usage of hythane as main fuel instead of methane results in a about 10% faster combustion and more concentrated flames areas.</div></div>

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“…The combustion speed of different gas components is different, resulting in a difference in the combustion process in the cylinder. By changing the composition of the combustible mixture, the combustion process of the engine can be improved and the stability of the working process can be improved [10][11][12][13][14]. Weaver and Santavicca et al [15] analyzed the influence of N2 content on the formation process of the fire core and the pressure in the cylinder on an optical engine.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamic Analysis of Shale Gas Engine Combustion Stability

Liu

Zhang

Zhong

et al. 2021

Preprint

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The traditional analysis method of engine combustion cycle variation is a statistical method based on a small amount of data. In essence, the obtained cycle variation is random data. In order to reveal the dynamic nature of the cyclical changes during the combustion of a shale gas engine, a nonlinear dynamics method was used to study the stability of the combustion process. The motion law of the phase space trajectory is analyzed, the influence of the shale gas composition on the trajectory distribution is analyzed, the return mapping point of the average indicated pressure in the cylinder is discussed. The relationship between adjacent combustion characteristic parameters is studied; the chaotic characteristics of the shale gas engine combustion process are discussed. The results show that during the working process of the shale gas engine, the in-cylinder pressure shows a similar quasi-periodic state in the entire phase space, and the working process has a certain chaotic law; with the increase of the CH4, N2 and CO2 content in the shale gas, the combustion cycle variation increases, and the randomness of the engine working process increases. The phase space trajectory shows a monotonously increasing distribution of Poincaré mapping points on the ∑XY+ section. With the increase of the combustion cycle, the linear relationship of the scattered points gradually increases, and the randomness of the combustion process increases. The return map points of the engine combustion characteristic parameters are distributed in a cluster. When the CH4 content increases, the distribution range of the average indicated pressure return map points increases. With the increase of N2 and CO2 content, abnormal combustion phenomena such as partial combustion or misfire occur during the engine combustion process, the uncertainty of the combustion process increases, and the combustion stability decreases. With the increase of engine speed, the correlation dimension and the maximum Lyapunov exponent increase, the randomness of the combustion process increases, and the chaotic characteristics of the engine working process are obvious; the time series of the cylinder pressure is more sensitive to the content of inert gas. With the increase of N2 and CO2 content in the gas, the correlation dimension and the maximum Lyapunov exponent increase significantly, the complexity of the phase space trajectory increases, and the chaotic characteristics become more obvious.

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Cycle-to-cycle variations of dual-fuel combustion in an optically accessible engine

Cited by 21 publications

References 37 publications

Simultaneous Visualization of Natural Luminosity and Chemiluminescence of Dual Fuel Combustion in an Optically Accessible Engine

Simultaneous Visualization of Natural Luminosity and Chemiluminescence of Dual Fuel Combustion in an Optically Accessible Engine

Analysis of Combustion Cycle-to-Cycle Variation in an Optical Single Cylinder Dual-Fuel Engine

Nonlinear Dynamic Analysis of Shale Gas Engine Combustion Stability

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