کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10264753 | 458013 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Blow-out limits of nonpremixed turbulent jet flames in a cross flow at atmospheric and sub-atmospheric pressures
ترجمه فارسی عنوان
مقادیر قابل انفجار شعله های جوش ناپذیر مخلوط در یک جریان متقاطع در فشار اتمسفری و زیر اتمسفر
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کلمات کلیدی
شعله جت ناپیوسته مخلوط، جریان صلیبی، محدودیت ضربه، اثر فشار،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
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 3650Â m and the atmospheric pressure condition is naturally low (64Â kPa). These results were compared with results obtained from a wind tunnel at standard atmospheric pressure (100Â kPa) in Hefei city (altitude 50Â m). The size of the fuel nozzles used in the experiments ranged from 3 to 8Â 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Combustion and Flame - Volume 162, Issue 10, October 2015, Pages 3562-3568
Journal: Combustion and Flame - Volume 162, Issue 10, October 2015, Pages 3562-3568
نویسندگان
Qiang Wang, Longhua Hu, Sung Hwan Yoon, Shouxiang Lu, Michael Delichatsios, Suk Ho Chung,