کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6593739 | 1423546 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Concurrent flame spread over discrete thin fuels
ترجمه فارسی عنوان
شعله همزمان در مورد سوخت های نازک گسسته است
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کلمات کلیدی
شعله پخش می شود سوخت گسسته،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
An unsteady two-dimensional numerical model was used to simulate concurrent flame spread over paper-like thin solid fuels of discrete configurations in microgravity (0â¯g with 20â¯cm/s) and in normal gravity (1â¯g). An array of ten 1 cm-long fuel segments was uniformly distributed in the flow direction (0â¯g) or in the vertical direction (1â¯g). A hot spot ignition source was applied at the upstream leading edge of the first fuel segment. The separation distance between the fuel segments was a parameter in this study, ranging from 0 (corresponding to a continuous fuel) to 3â¯cm. Using this setup, the burning characteristics, spread rate of the flame base, and the solid burning rate were examined. The flame base spread rates in both 1â¯g and 0â¯g cases increase with the separation distance. This is due to the flame jumping across the gaps. For the solid burning rate, the dependency on the separation distance is different in 1â¯g and 0â¯g cases. At a flow velocity of 20â¯cm/s in 0â¯g, the flame reaches a limiting length and the flame length is approximately the same for all fuel configurations. As the separation distance increases, the heating length (the fuel area exposed to the flame) decreases, resulting in a decreasing total heat input and a decreasing solid burning rate. In 1â¯g, the flame is long and extends to the last fuel segment before the first fuel segment burns out. This suggests that the heating length is approximately the same in all simulated cases (â¼total fuel length). However, the flame standoff distance decreases when the separation distance increases. This results in an increasing total heat input and an increasing solid burning rate. Terrestrial experiments were conducted to validate the 1â¯g model. The experimental results agreed reasonably with the model predictions of burning characteristics, burn durations, and flame spread rates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Combustion and Flame - Volume 191, May 2018, Pages 116-125
Journal: Combustion and Flame - Volume 191, May 2018, Pages 116-125
نویسندگان
JeanHyuk Park, Jared Brucker, Ryan Seballos, Byoungchul Kwon, Ya-Ting T. Liao,