بررسی افزودن نانوذرات مختلف به سوخت بر روی احتراق، اتمیزاسیون اسپری سوخت و آلایندگی موتور‌های دیزلی پاشش مستقیم

نوع مقاله : مقاله پژوهشی

نویسنده

استادیار،دانشگاه علوم دریایی امام خمینی (ره) ، نوشهر ، ایران

چکیده

یکی از استراتژی‌های نوین به منظور بهبود عملکرد و آلایندگی موتورهای دیزلی، استفاده از سوخت‌های جایگزین و نیز افزودنی‌های مناسب نظیز نانوذرات به سوخت دیزل می‌باشد. نانوسوخت‌ها نقش بسزایی در بهینه‌کردن فرآیند‌های احتراق و در نتیجه مصرف سوخت و آلاینده‌های خروجی دارند. در این مقاله تاثیر افزودن نانوذرات مختلف (نانوذرات اکسیدهای سریم، آلومنیوم و مس) در غلظت 100 پی‌پی‌ام، به سوخت دیزل، بر روی فرآیند احتراق و آلایندگی موتورهای دیزلی با استفاده از کد دینامیک سیالات محاسباتیِ فایر، بررسی شده‌ است. برای ارزیابی نتایج حاصل از شبیه‌سازی، تغییرات فشار داخل سیلندر، مقدار بیشینه فشار تجربی و زاویه رخداد آن با مقدار حاصل از حل عددی مقایسه شده‌ است. در کنار این پارامتر، مقادیر تجربی آلاینده‌های اکسیدهای نیتروژن، دوده، توان و همچنین مصرف سوخت ویژه ترمزی با مقادیر عددی ارزیابی گردید. نتایج نشان می‌دهد که نانوذرات، میزان حرارت منتقل شده به سوخت را افزایش داده و با تسریع احتراق، سبب کاهش زمان تاخیر در اشتعال می‌گردند. همچنین اختلاط بهتر مخلوط سوخت و هوا، در نانوذرات اکسید سریم نسبت به سایر نانوذرات، مکانسیم اشتعالی سوخت را بهبود بخشیده که منجر به احتراق کامل‌تر و افزایش 5/14 درصدی توان و نیز کاهش 6 درصدی مصرف سوخت و 34 درصدی آلاینده دوده در مقایسه با سوخت دیزل خالص گردید. تنها نکته منفی آن، افزایش 31 درصدی آلاینده اکسید نیتروژن می‌باشد که می‌توان آن را با مبدل‌های کاتالیزوری کاهش داد

کلیدواژه‌ها

عنوان مقاله [English]

Modeling of adding different nanoparticles to fuel on combustion, fuel spray atomization and emissions of DI diesel engines

نویسنده [English]

  • Abbas Zarenezhad Ashkezari
Assistant Professor, Imam Khomeini University of Marine Sciences, Nowshahr, Iran
چکیده [English]

One of the novel strategies to improve the performance and emissions of diesel engines is the use of alternative fuels as well as suitable additives such as nanoparticles to diesel fuel. Nanofuels play an important role in the optimization of combustion processes, fuel consumption, and emissions. In this paper, the effect of adding different nanoparticles (cerium, aluminum, and copper oxide nanoparticles) at a concentration of 100 particles per million (ppm) to diesel fuel on the combustion process and emissions of diesel engines has been investigated by using FIRE computational fluid dynamics code. For validation, the in-cylinder pressure variations, the experimental peak pressure, and the angle of occurrence are compared with the numerical results. In addition, the experimental data of NOx, soot, power as well as brake specific fuel consumption were evaluated with numerical values. The results show that nanoparticles increase the amount of heat transfer to the fuel and decrease the ignition delay. Also, better mixing of fuel and air in cerium oxide nanoparticles compared to other nanoparticles improved the fuel ignition mechanism, which leads to more complete combustion and a 14.5% increase in power and also a 6% and 34% reduction in fuel consumption and soot compared to diesel fuel respectively. The only downside is the 31% increase in NOx, which can be reduced by catalytic converters.

کلیدواژه‌ها [English]

  • Nanoparticles
  • Diesel Engine
  • Emissions
  • Fuel Spray
  • CFD

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مکانیک سیالات و آیرودینامیک
دوره 11، شماره 1 - شماره پیاپی 29
بهار و تابستان 1401
شهریور 1401
صفحه 17-39

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سابقه مقاله

  • تاریخ دریافت: 28 بهمن 1400
  • تاریخ بازنگری: 01 تیر 1401
  • تاریخ پذیرش: 10 مرداد 1401
  • تاریخ انتشار: 01 شهریور 1401

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