Academic Journal
Blow-out limits of nonpremixed turbulent jet flames in a cross flow at atmospheric and sub-atmospheric pressures
| العنوان: | Blow-out limits of nonpremixed turbulent jet flames in a cross flow at atmospheric and sub-atmospheric pressures |
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| المؤلفون: | Wang, Qiang, Hu, Longhua, Yoon, Sung Hwan, Lu, Shouxiang, Delichatsios, Michael, Chung, Suk Ho |
| المساهمون: | King Abdullah University of Science and Technology (KAUST), Clean Combustion Research Center, Combustion and Laser Diagnostics Laboratory, Mechanical Engineering Program, Physical Science and Engineering (PSE) Division, State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, China, Division of Mechanical and Space Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido, Japan, FireSERT, School of Built Environment, University of Ulster, Newtownabbey BT38 8GQ, Ireland |
| بيانات النشر: | Elsevier BV |
| سنة النشر: | 2015 |
| المجموعة: | King Abdullah University of Science and Technology: KAUST Repository |
| مصطلحات موضوعية: | Nonpremixed turbulent jet flame, Cross flow, Blow-out limit, Pressure effect |
| الوصف: | The blow-out limits of nonpremixed turbulent jet flames in cross flows were studied, especially concerning the effect of ambient pressure, by conducting experiments at atmospheric and sub-atmospheric pressures. The combined effects of air flow and pressure were investigated by a series of experiments conducted in an especially built wind tunnel in Lhasa, a city on the Tibetan plateau where the altitude is 3650 m and the atmospheric pressure condition is naturally low (64 kPa). These results were compared with results obtained from a wind tunnel at standard atmospheric pressure (100 kPa) in Hefei city (altitude 50 m). The size of the fuel nozzles used in the experiments ranged from 3 to 8 mm in diameter and propane was used as the fuel. It was found that the blow-out limit of the air speed of the cross flow first increased (“cross flow dominant” regime) and then decreased (“fuel jet dominant” regime) as the fuel jet velocity increased in both pressures; however, the blow-out limit of the air speed of the cross flow was much lower at sub-atmospheric pressure than that at standard atmospheric pressure whereas the domain of the blow-out limit curve (in a plot of the air speed of the cross flow versus the fuel jet velocity) shrank as the pressure decreased. A theoretical model was developed to characterize the blow-out limit of nonpremixed jet flames in a cross flow based on a Damköhler number, defined as the ratio between the mixing time and the characteristic reaction time. A satisfactory correlation was obtained at relative strong cross flow conditions (“cross flow dominant” regime) that included the effects of the air speed of the cross flow, fuel jet velocity, nozzle diameter and pressure. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 00102180 |
| Relation: | http://linkinghub.elsevier.com/retrieve/pii/S0010218015001935; Blow-out limits of nonpremixed turbulent jet flames in a cross flow at atmospheric and sub-atmospheric pressures 2015 Combustion and Flame; Combustion and Flame; http://hdl.handle.net/10754/567061 |
| DOI: | 10.1016/j.combustflame.2015.06.012 |
| الاتاحة: | http://hdl.handle.net/10754/567061 https://doi.org/10.1016/j.combustflame.2015.06.012 |
| Rights: | NOTICE: this is the author’s version of a work that was accepted for publication in Combustion and Flame. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Combustion and Flame, 22 July 2015. DOI:10.1016/j.combustflame.2015.06.012 |
| رقم الانضمام: | edsbas.EB4A1124 |
| قاعدة البيانات: | BASE |
| تدمد: | 00102180 |
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| DOI: | 10.1016/j.combustflame.2015.06.012 |