کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7716928 1497473 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A numerical study on pressure wave-induced end gas auto-ignition near top dead center of a downsized spark ignition engine
ترجمه فارسی عنوان
مطالعه ای عددی در مورد اتمسفر اتوماتیک گاز انتهایی ناشی از فشار در نزدیکی مرکز اصلی موتور احتراق جرقه ای
کلمات کلیدی
اشتعال خودکار، موج فشار هیدروژن، موتور، تجزیه و تحلیل میزان حساسیت،
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی
Auto-ignition of end gas is known as a main cause of knock in SI engine. In order to study the characters of auto-ignition induced by pressure wave, different levels of hot zones characterized by temperature gradients are created in end gas, which are then ignited by incident pressure wave developed from main flame. Evolutions of pressure and temperature in end gas are monitored to investigate pressure incidence and end gas auto-ignition. Computational Fluid Dynamics (CFD) calculations are carried out in a simplified two-dimensional symmetrical computational domain. Turbulence is modeled by renormalization-group (RNG) k-ε model and the turbulence-chemistry interaction is modeled using Eddy Dissipation Concept (EDC) with a detailed chemical kinetic mechanism for hydrogen oxidation. Ignition delay sensitivity analysis is also employed to investigate chemical kinetics during the incidence of pressure wave. The results show that the incidence of pressure wave has significantly different effects on auto-ignition characteristics, thus resulting in different ignition delays, pressure oscillations and enhancements of reflected pressure wave.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 36, 12 December 2014, Pages 21265-21274
نویسندگان
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