کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
241282 1427928 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Conditional statistics of nonreacting and reacting sprays in turbulent flows by direct numerical simulation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Conditional statistics of nonreacting and reacting sprays in turbulent flows by direct numerical simulation
چکیده انگلیسی

Conditional statistics concerning evaporation and combustion of a spray are investigated in homogeneous, isotropic, and decaying two-dimensional (2D) turbulence. Randomly distributed, polydisperse droplets of n-heptane go through single-step combustion chemistry. Attention is focused on parametric effects of initial Sauter mean radius (SMR), turbulence level and droplet velocity in both reacting and nonreacting cases. A simple linear model for the conditional evaporation rate is proposed and validated against DNS data. A conventional β-probability density function (pdf) is shown to be valid with no peak occurring on the fuel side. The amplitude mapping closure (AMC) model works well for the conditional scalar dissipation rate with evaporating and reacting sprays. Parametric study shows that initial SMR and droplet velocity are major factors affecting conditional flame structures, whereas the effect of reaction is not significant except during autoignition.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Proceedings of the Combustion Institute - Volume 31, Issue 2, January 2007, Pages 2335–2342
نویسندگان
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