High temperature reaction rate coefficients derived from N-atom ARAS measurements and excimer photolysis of NO

1990 ◽  
Vol 22 (8) ◽  
pp. 843-861 ◽  
Author(s):  
D. F. Davidson ◽  
R. K. Hanson
Keyword(s):  
High Temperature ◽  
Reaction Rate ◽  
Rate Coefficients ◽  
Temperature Reaction ◽  
High Temperature Reaction

Si-C-O Fibres in Gas Reactive Atmospheres

2010 ◽  
Vol 71 ◽  
pp. 86-91 ◽  
Author(s):  
Mathieu Brisebourg ◽  
Stephane Mazerat ◽  
Geraldine Puyoo ◽  
Herve Plaisantin ◽  
Philippe Dibandjo ◽  
...  
Keyword(s):  
High Temperature ◽  
Growth Kinetics ◽  
Reaction Rate ◽  
Reaction Rates ◽  
Carbon Layer ◽  
Layer Growth ◽  
Temperature Reaction ◽  
Initial Composition ◽  
High Temperature Reaction ◽  
Composition And Structure

The aim of the present work was to investigate the high temperature reaction between Si- C-O fibres and Cl2, and to correlate the carbon layer growth kinetics with their initial composition and structure. Large disparities have been observed between the various materials reaction rates. If a large amount of mixed silicon atom environments increases the reactivity of Si-O-C materials with Cl2, this sole feature does not explain all the experimental results. Traces of heteroelements (Ti, Zr, Al…) or percolated free carbon both appear to bear on the reaction rate. For a better understanding of the fibres reaction behaviour, this study was extended to other model materials (oxycarbide glasses, oxygen-free Si-C fibres, SiC).

Study of high-pressure air jet controlled compression ignition with compound thermodynamic cycle for combustion and emission formation process

2020 ◽  
pp. 146808742096933
Author(s):  
Xiangyu Meng ◽  
Sicheng Liu ◽  
Jingchen Cui ◽  
Jiangping Tian ◽  
Wuqiang Long ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Low Temperature ◽  
Formation Process ◽  
Combustion Process ◽  
Thermodynamic Cycle ◽  
Compression Ignition ◽  
Temperature Reaction ◽  
Air Jet ◽  
High Temperature Reaction

A novel method called high-pressure air (HPA) jet controlled compression ignition (JCCI) based on the compound thermodynamic cycle was investigated in this work. The combustion process of premixed mixture can be controlled flexibly by the high-pressure air jet compression, and it characterizes the intensified low-temperature reaction and two-stage high-temperature reaction. The three-dimensional (3D) computational fluid dynamics (CFD) numerical simulation was employed to study the emission formation process and mechanism, and the effects of high-pressure air jet temperature and duration on emissions were also investigated. The simulation results showed that the NOx formation is mainly affected by the first-stage high-temperature reaction due to the higher reaction temperature. Overall, this combustion mode can obtain ultra-low NOx emission. The second-stage high-temperature reaction plays an important role in the CO and THC formation caused by the mixing effect of the high-pressure air and original in-cylinder mixture. The increasing air jet temperature leads to a larger high-temperature in-cylinder region and more fuel in the first-stage reaction, and therefore resulting in higher NOx emission. However, the increasing air jet temperature can significantly reduce the CO and THC emissions. For the air jet duration comparisons, both too short and too long air jet durations could induce higher NOx emission. A higher air jet duration would result in higher CO emission due to the more high-pressure air jet with relatively low temperature.

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