Experimental and Numerical Study of Flame Kernel Formation Processes of Propane-Air Mixture in a Pressurized Combustion Vessel

2016 ◽  
Vol 9 (3) ◽  
pp. 1494-1511 ◽  
Author(s):  
Xiucheng Zhu ◽  
Lorenzo Sforza ◽  
Tejas Ranadive ◽  
Anqi Zhang ◽  
Seong-Young Lee ◽  
...  
Keyword(s):  
Numerical Study ◽  
Formation Processes ◽  
Flame Kernel ◽  
Pressurized Combustion ◽  
Combustion Vessel

The Impact of Spark Discharge Pattern on Flame Initiation in a Turbulent Lean and Dilute Mixture in a Pressurized Combustion Vessel

2013 ◽  
Vol 6 (1) ◽  
pp. 435-446 ◽  
Author(s):  
Anqi Zhang ◽  
Khanh Cung ◽  
Seong-Young Lee ◽  
Jeffrey Naber ◽  
Garlan Huberts ◽  
...  
Keyword(s):  
Spark Discharge ◽  
Discharge Pattern ◽  
Pressurized Combustion ◽  
The Impact ◽  
Dilute Mixture ◽  
Combustion Vessel

scholarly journals Numerical Study of Hydrogen Auto-Ignition Process in an Isotropic and Anisotropic Turbulent Field

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1869
Author(s):  
Agnieszka Wawrzak ◽  
Artur Tyliszczak
Keyword(s):  
Ignition Delay ◽  
Numerical Study ◽  
Maximum Temperature ◽  
Combustion Model ◽  
Ignition Process ◽  
Length Scales ◽  
Flame Kernel ◽  
Turbulent Field ◽  
Auto Ignition ◽  
Turbulence Length

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. Special attention is given to the ignition scenario, ignition delay, size and shape of the flame kernel among different turbulent regimes. Different stages of ignition are analysed for various levels of the initial velocity fluctuations and turbulence length scales. Impact of these parameters is found small for the ignition delay time but turns out to be significant during the flame kernel propagation phase and persists up to the stabilisation stage. In general, it is found that in the isotropic conditions, the flame growth and the rise of the maximum temperature in the domain are more dependent on the initial fluctuations level and the length scales. In the anisotropic regimes, these parameters have a substantial influence on the flame only during the initial phase of its development.

scholarly journals A Numerical Study on Early Stage of Flame Kernel Development in Spark Ignition Process for Methane/Air Combustible Mixtures

2007 ◽  
Vol 73 (732) ◽  
pp. 1745-1752 ◽  
Author(s):  
Shinji NAKAYA ◽  
Kazuo HATORI ◽  
Mitsuhiro TSUE ◽  
Michikata KONO ◽  
Daisuke SEGAWA ◽  
...  
Keyword(s):  
Numerical Study ◽  
Early Stage ◽  
Spark Ignition ◽  
Ignition Process ◽  
Kernel Development ◽  
Flame Kernel ◽  
Combustible Mixtures

A Numerical Study on Detailed Soot Formation Processes in Diesel Combustion

2014 ◽  
Vol 7 (4) ◽  
pp. 1674-1685 ◽  
Author(s):  
Beini Zhou ◽  
Akira Kikusato ◽  
Kusaka Jin ◽  
Yasuhiro Daisho ◽  
Kiyotaka Sato ◽  
...  
Keyword(s):  
Soot Formation ◽  
Numerical Study ◽  
Diesel Combustion ◽  
Formation Processes

Numerical study of the low-frequency atomic dynamics in a Lennard-Jones glass

1998 ◽  
Vol 77 (2) ◽  
pp. 473-484 ◽  
Author(s):  
M. Sampoli, P. Benassi, R. Dell'Anna,
Keyword(s):  
Numerical Study ◽  
Low Frequency ◽  
Lennard Jones

I Like Her, Because I Like Myself: Self-Evaluation as a Source of Interpersonal Attitudes

2003 ◽  
Vol 50 (4) ◽  
pp. 239-246 ◽  
Author(s):  
Eva Walther ◽  
Claudia Trasselli
Keyword(s):  
Opposite Effect ◽  
Learning Phase ◽  
The Self ◽  
Attitude Formation ◽  
Formation Processes ◽  
False Feedback ◽  
Self Evaluation ◽  
Evaluation Group ◽  
Group A ◽  
The Difference

Abstract. Two experiments tested the hypothesis that self-evaluation can serve as a source of interpersonal attitudes. In the first study, self-evaluation was manipulated by means of false feedback. A subsequent learning phase demonstrated that the co-occurrence of the self with another individual influenced the evaluation of this previously neutral target. Whereas evaluative self-target similarity increased under conditions of negative self-evaluation, an opposite effect emerged in the positive self-evaluation group. A second study replicated these findings and showed that the difference between positive and negative self-evaluation conditions disappeared when a load manipulation was applied. The implications of self-evaluation for attitude formation processes are discussed.

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