مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

ارزیابی مدل‌های نیمه‌تجربی انتقال حرارت برای تعیین شار حرارتی در موتور اشتعال تراکمی مخلوط همگن با سوخت گاز طبیعی

نوع مقاله : پژوهشی اصیل

نویسندگان
مسعود رابطی 1
امید جهانیان 2
علی‌اکبر رنجبر 1
سید محمد صفی الدین اردبیلی 3
1 دانشگاه صنعتی نوشیروانی بابل
2 دانشکده مهندسی مکانیک، دانشگاه صنعتی نوشیروانی بابل
3 دانشگاه شهید چمران اهواز، اهواز، ایران
چکیده
احتراق اشتعال تراکمی‌ مخلوط همگن به دلیل بازده حرارتی بالا و تولید اکسیدهای نیتروژن و دوده ناچیز، توجهات بسیاری را به خود جلب کرده است. انتقال حرارت از گازها به دیواره‌های محفظه احتراق تاثیر زیادی بر روی احتراق و فرایند شکل‌گیری آلاینده‌ها در موتور اشتعال تراکمی مخلوط همگن دارد. در این مطالعه برای اولین بار با در نظر گرفتن سوخت گاز طبیعی، از مدل صفربعدی تک‌ناحیه­ای کوپل با سینتیک مفصل شیمیایی برای ارزیابی مدل‌های نیمه‌تجربی انتقال حرارت آناند، وشنی، هوهنبرگ، آسانیس و هنسل جهت تعیین شار حرارتی در موتور اشتعال تراکمی مخلوط همگن استفاده شد. برای این منظور ابتدا مدل سه‌بعدی دینامیک سیالات محاسباتی کوپل با سینتیک مفصل شیمیایی با داده‌های تجربی صحت‌سنجی شد و مدل سه‌بعدی به‌عنوان مرجع و پایه مقایسه برای ارزیابی مدل صفربعدی قرار گرفت. از روش سطح پاسخ به‌منظور بررسی اثر پارامترهای ورودی عملکردی موتور شامل فشار ورودی (5/1 ،25/1 ،1) بار، نسبت هم‌ارزی (7/0 ،5/0 ،3/0) و دور موتور (1400 ،1100 ،800) دوربردقیقه بر پارامترهای خروجی فشار درون سیلندر و شار حرارتی استفاده شد. نتایج مدل‌سازی صفربعدی نشان داد که در بیشتر مواردی که مورد بررسی قرار گرفت مدل آناند بهترین قابلیت را برای پیش‌بینی شار حرارتی ارائه می­دهد. همچنین مدل هوهنبرگ شار حرارتی را بیشتر از مقدار محاسبه شده توسط مدل سه‌بعدی پیش‌بینی می‌کند درحالیکه مدل‌های آسانیس و هنسل شار گرمایی را کمتر از مقدار ارائه شده توسط مدل سه‌بعدی برآورد نمودند. علاوه بر این مدل وشنی نمی‌تواند برای مدل‌کردن شار حرارتی در موتور اشتعال تراکمی مخلوط همگن در این شرایط استفاده شود.
کلیدواژه‌ها
موتور اشتعال تراکمی مخلوط همگن
مدل‌های نیمه‌تجربی انتقال حرارت
شار حرارتی
گاز طبیعی

موضوعات

عنوان مقاله English

Investigations on semi-empirical heat transfer models for heat flux of HCCI engine fueled with natural gas

نویسندگان English

Masoud Rabeti 1
Omid Jahanian 2
Ali akbar Ranjbar 1
Seyed Mohammad Safieddin Ardebili 3
1 Babol Noshirvani University of Technology
2 Department of Mechanical Engineering, Babol Noshirvani University of Technology
3 Shahid Chamran University of Ahvaz, Ahvaz, Iran
چکیده English

Homogeneous charge compression ignition (HCCI) has attracted lots of attention due to the high thermal efficiency, lower NO­x, and Soot exhaust emissions. Heat transfer from the gases to the combustion chamber walls has effective impact on the combustion process and the formation of engine-out emissions in HCCI engine. In this study for the first time a zero-dimensional single-zone model coupled with detailed chemical kinetics was used to evaluate the semi-empirical heat transfer models of Annand, Woschni, Hohenberg along with Assanis and Hensel to calculate heat flux in an HCCI engine fueled with natural gas. For this purpose, the 3D-CFD model coupled with detailed chemical kinetics was firstly validated by using experimental data, and then the 3D derived model was used as a base model for evaluating zero-dimensional model. Furthermore, the response surface model (RSM) was employed for investigating the effect of input parameters of engine including intake pressure (1, 1.25, and 1.5bar), equivalence ratio (0.3, 0.5, and 0.7), and engine speed (800, 1100, and 1400rpm) on the output parameters i.e., in-cylinder pressure and heat flux. In most cases were assessed, the zero-dimensional simulation results indicated that Annand technique provided the best model for heat flux simulation. Besides, the model of Hohenberg overpredict the heat flux in comparison with the calculated values derived from the 3D model, while Assanis and Hensel models underpredict the heat flux compared with the evaluated value of the 3D model. Furthermore, Woschni’s model cannot be used to model the heat flux in HCCI engine.

کلیدواژه‌ها English

Homogeneous charge compression ignition
Semi-Empirical Heat Transfer Models
Heat Flux
Natural gas
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مهندسی مکانیک مدرس
دوره 21، شماره 12
آذر 1400
صفحه 797-810