کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4764394 | 1423557 | 2017 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spatio-temporal evolution of harmonic disturbances on laminar, non-premixed flames: Measurements and analysis
ترجمه فارسی عنوان
تکامل زمانی و مکانی اختلالات هارمونیک در شعله های لامینر، بدون پیش مخلوط: اندازه گیری و تجزیه و تحلیل
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کلمات کلیدی
شعله غیرمعمول، پویایی شعله، عملکرد انتقال شعله، پاسخ شعله، سرعت پاسخ متقابل، ناپایداری احتراق،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
This paper analyzes the dynamics of harmonically forced, non-premixed flames, both experimentally and computationally. Prior theory has made a number of predictions on how wrinkles on non-premixed flamelets are excited by flow disturbances, convect axially, and evolve in disturbance magnitude, including setting up interference patterns in wrinkle disturbance magnitude. The objective of this study was to obtain measurements from forced flames to determine if these features are present, and to compare the gain/phase of these wrinkles with predictions using the measured velocity field as inputs. High speed PIV data was taken on a coflowing methane-air diffusion flame, equipped with speakers for harmonic forcing, over a variety of flow velocities, forcing frequencies, and forcing amplitudes. These measured velocity fields were used as inputs to a Z-equation solver, and the resulting space-time dynamics of iso-Z surfaces were extracted from the Z field solutions. Both experimental and numerical results show that flame wrinkles propagate axially at the mean flow velocity, a result consistent with previous analytical findings. These wrinkles start with near zero magnitude at the fuel tube lip and grow with downstream distance, until peaking at some axial location. Further downstream, the wrinkle magnitude modulates, indicative of interference effects which have been previously predicted in analytical studies.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Combustion and Flame - Volume 180, June 2017, Pages 262-275
Journal: Combustion and Flame - Volume 180, June 2017, Pages 262-275
نویسندگان
Nicholas Magina, William Steele, Benjamin Emerson, Timothy Lieuwen,