کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10264623 | 457947 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Maximum stretched flame speeds of laminar premixed counter-flow flames at variable Lewis number
ترجمه فارسی عنوان
حداکثر سرعت شعله کشیده شده از شعله های مخلوط انعطاف پذیر چند لایه در تعداد لوییس متغیر
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
سرعت شعله مرجع شعله کشش، شماره لوئیس، نفوذ ترجیحی، سرعت سنجی ذرات ریز،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
This paper examines Lewis-number effects on stretched, laminar, premixed flames near extinction. It presents the experimental measurement of maximum stretched flame speed and extinction limit for the premixed laminar combustion of selected low, unity and high-Lewis number mixtures. Stretched, fuel-lean, laminar flames of methane with Leâ
1, propane with Le>1 and hydrogen with Leâª1 are studied experimentally in a counter-flow flame configuration. Flow velocity is measured in these flames by particle tracking velocimetry. Results show that a maximum reference flame speed exists for mixtures with Leâ³1 at lower flame-stretch values than the extinction stretch rate. In contrast, a continually-increasing reference flame speed is measured for Leâª1 mixtures until extinction occurs when the flame is constrained by the stagnation point. Laminar flame results are also compared to numerical simulations employing a one-dimensional stagnation flame model. The chemical-kinetic models for each respective mixture capture the important trends of a maximum in su,ref ahead of the extinction stretch rate for methane and propane, and an increasing su,ref to extinction for hydrogen. These results are important to the investigation of the leading edge theory of premixed turbulent combustion, in which maximum stretched flamelet speed is a key parameter.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Combustion and Flame - Volume 162, Issue 9, September 2015, Pages 3324-3332
Journal: Combustion and Flame - Volume 162, Issue 9, September 2015, Pages 3324-3332
نویسندگان
Sean D. Salusbury, Jeffrey M. Bergthorson,