Please use this identifier to cite or link to this item:
https://doi.org/10.1016/j.apenergy.2020.114795
Title: | Investigations of autoignition and propagation of supersonic ethylene flames stabilized by a cavity | Authors: | Huang, Zhiwei Zhang, Huangwei |
Keywords: | Science & Technology Technology Energy & Fuels Engineering, Chemical Engineering Supersonic combustion Autoignition Flame stabilization Large eddy simulation Ethylene flame Strut and cavity combination LARGE-EDDY SIMULATION LASER-INDUCED PLASMA IGNITION PROCESSES STRUT-INJECTION COMBUSTION MODEL OH SEMIDISCRETE OSCILLATION TEMPERATURE |
Issue Date: | 1-May-2020 | Publisher: | ELSEVIER SCI LTD | Citation: | Huang, Zhiwei, Zhang, Huangwei (2020-05-01). Investigations of autoignition and propagation of supersonic ethylene flames stabilized by a cavity. APPLIED ENERGY 265. ScholarBank@NUS Repository. https://doi.org/10.1016/j.apenergy.2020.114795 | Abstract: | © 2020 Elsevier Ltd Two analysis methods for time scale and energy balance relevant to flame ignition and stabilization in cavity-stabilized flames are developed. The interaction time of hot product in the recirculation zone of the cavity with the surrounding unburned mixture and the reaction induction time of the mixture are estimated in the time scale method. The energy release from chemical reactions and the energy loss due to species exchange in the recirculation zone are included in the energy balance method. The autoignition and propagation of supersonic ethylene flames in a model supersonic combustor with a cavity is investigated first using highly resolved large eddy simulation. The evolutions of the two time scales are then calculated in the ignition process of the supersonic ethylene flames. It is found that the time scale theory is well valid in the flame propagation and stabilization stages. The rates of energy generation and loss are then analyzed in the cavity. It is found that initially the local energy generation rate is relatively small, resulting in slow net energy accumulation in the cavity. Then the energy generation increases due to the intermittent flame propagation in the cavity, whereas the energy loss oscillates consistently since the burned gas leaves the cavity. Also, energy generation and loss are generally balanced in the cavity and all tend to zero after the flame is globally stabilized. The two methods present the characteristic time scales and energy balancing during the transient ignition process for the first time. | Source Title: | APPLIED ENERGY | URI: | https://scholarbank.nus.edu.sg/handle/10635/173124 | ISSN: | 03062619 18729118 |
DOI: | 10.1016/j.apenergy.2020.114795 |
Appears in Collections: | Staff Publications Elements |
Show full item record
Files in This Item:
File | Description | Size | Format | Access Settings | Version | |
---|---|---|---|---|---|---|
1-s2.0-S030626192030307X-main.pdf | 3.42 MB | Adobe PDF | CLOSED | None |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.