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Analytical study of initial flame kernel in laser ignition

Journal of Thermal Science and Technology
The formation process of an initial flame kernel in laser ignition was analytically examined for understanding its experimentally-observed hugeness. First, we evaluated the thermodynamic state of the laser-heated plasma by examining the laser-absorption ...
Takuma ENDO
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Multi-kernel support vector regression with improved moth-flame optimization algorithm for software effort estimation [PDF]

Scientific Reports
In this paper, a novel Moth-Flame Optimization (MFO) algorithm, namely MFO algorithm enhanced by Multiple Improvement Strategies (MISMFO) is proposed for solving parameter optimization in Multi-Kernel Support Vector Regressor (MKSVR), and the MISMFO ...
Jing Li, Shengxiang Sun, Li Xie, Chen Zhu, Dubo He   +4 more
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Effect of Microwave Pulses on the Morphology and Development of Spark-Ignited Flame Kernel

Energies, 2021
Microwave-assisted spark ignition (MAI) is a promising way to enhance the ignition performance of engines under lean conditions. To understand the effect of microwave-induced flow during MAI, the development and morphology of spark-ignited methane-air ...
Xiaobei Cheng, Xinhua Zhang, Zhaowen Wang, Huimin Wu, Zhaowu Wang, Jyh-Yuan Chen   +5 more
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Numerical Study of Hydrogen Auto-Ignition Process in an Isotropic and Anisotropic Turbulent Field

Energies, 2021
The physical mechanisms underlying the dynamics of the flame kernel in stationary isotropic and anisotropic turbulent field are studied using large eddy simulations (LES) combined with a pdf approach method for the combustion model closure.
Agnieszka Wawrzak, Artur Tyliszczak
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Investigating the relationship between butanol molecular structure and combustion performance in an optical SIDI engine

Energy Conversion and Management: X, 2023
Butanol has a high potential as a renewable substitution for gasoline in spark-ignition direct-injection (SIDI) engines. Different butanol isomers showed various flame characteristics that are strongly related to their molecular structure. However, there
Weixuan Zhang, Mingli Cui, Bowei Yao, Mohamed Nour, Xuesong Li, Min Xu   +5 more
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Shock Wave Propagation and Flame Kernel Morphology in Laser-Induced Plasma Ignition of CH₄/O₂/N₂ Mixture

Energies, 2021
The application of laser ignition in the aerospace field has promising prospects. Based on the constant volume combustion chamber, the laser ignition of CH4/O2/N2 mixture with different initial pressure, different laser energy, different equivalence ...
Junjie Zhang, Erjiang Hu, Qunfei Gao, Geyuan Yin, Zuohua Huang   +4 more
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Flame kernel development with radiofrequency oscillating plasma ignition

Plasma Sources Science and Technology, 2022
Abstract In this paper a radiofrequency oscillating plasma discharge is investigated under various initial pressures up to 5 atm in a constant-volume combustion chamber. The oscillating plasma is suppressed by elevated pressure, both in length and branch number. The ignition performance under elevated background pressure is investigated,
Xiao Yu, Linyan Wang, Shui Yu, Meiping Wang, Ming Zheng   +4 more
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Lean Burn Flame Kernel Characterization for Different Spark Plug Designs and Orientations in an Optical GDI Engine

Energies, 2022
Lean burn spark ignition (SI) engines represent an effective solution for improving fuel economy and reducing exhaust emissions and can be implemented both in conventional and hybrid powertrains.
Giovanni Cecere, Adrian Irimescu, Simona Silvia Merola, Luciano Rolando, Federico Millo   +4 more
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Effects of hydrogen addition and turbulence on ignition and meso-scale flames of propane mixtures

Journal of Thermal Science and Technology, 2022
This study has investigated experimentally the effects of hydrogen addition and turbulence on the ignition and the flame-kernel development characteristics in isotropic and homogeneous turbulence for propane mixtures.
Masaya NAKAHARA, Kodai TANIMOTO, Hisanobu KUDO, Yuta MARUYAMA, Fumiaki ABE   +4 more
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Study of laminar flame speed measurement under high pressure condition using double kernel method by laser-induced breakdown ignition

Journal of Thermal Science and Technology, 2020
In order to understand turbulent combustion and its combustion characteristics, laminar flame speed is often used. Laminar flame speed plays an important role in turbulent combustion models used in engine combustion simulation.
Takehiko SEO, Hirotsugu KANEKO, Masato MIKAMI   +2 more
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