بررسی اثر زمان پاشش سوخت بر عملکرد موتور اشتعال تراکمی با واکنش‌‏پذیری مهارشده

قره‌قانی, آیت; فخاری, امیر حسین; آقاحسنی, مهدی

doi:10.22034/er.2023.1987237.1000

بررسی اثر زمان پاشش سوخت بر عملکرد موتور اشتعال تراکمی با واکنش‌‏پذیری مهارشده

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران

10.22034/er.2023.1987237.1000

چکیده

احتراق اشتعال تراکمی با واکنش‌پذیری مهار‌شده به دلیل بازدهی مناسب، کاهش مصرف سوخت و ظرفیت خوب در کاهش مقدار آلایندگی یکی از راهبرد‌های جذاب احتراق سرد است. این نوع از احتراق در سال‌های اخیر به دلیل نگرانی‌های جهانی در مورد تخریب محیط‌زیست، قوانین سخت‌گیرانه آلایندگی، کاهش ذخایر نفت و افزایش قیمت سوخت‌های سنگواره‌‏ای مورد توجه قرار گرفته است. در پژوهش حاضر احتراق اشتعال تراکمی با واکنش‌پذیری مهارشده، با سوخت ترکیبی دیزل و بنزین به کمک دینامیک سیالات محاسباتی به‌صورت وابسته با واکنش شیمیایی مفصل و با استفاده از نرم‏‌افزار AVL FIRE شبیه‌‏سازی شده است. هدف، بررسی اثر تغییر لحظه پاشش سوخت دیزل بر احتراق و آلایندگی است. در این راستا، اثرات تغییر لحظه پاشش سوخت دیزل در بازه 20 تا 40 bTDC در دور موتور ثابت 1150 د.د.د.، بر فشار داخل استوانه‏، نرخ آزادسازی گرما، حالت احتراق و مقدار آلایندگی‌های مونو‌اکسید‌کربن، اکسید‌های نیتروژن، هیدروکربن‌های نسوخته و گاز گلخانه‌ای دی‌اکسید‌کربن بررسی شد. کاهش آلایندگی NO_X با پیش‏‌اندازی لحظه پاشش سوخت به 40 درجه bTDC، یکی از مهم‌ترین نتایج این پژوهش است. با پیش‌‏اندازی لحظه پاشش سوخت دیزل، احتراق سریع‌تر آغاز می‌شود. با افزایش بازه پاشش، بیشینه فشار داخل استوانه‏ کاهش می‌یابد و لحظه احتراق به تعویق می‌افتد. همچنین با افزایش پیش‌‏اندازی پاشش سوخت از 20 تا 30 درجه bTDC، مقدار مونواکسیدکربن تولیدی کاهش و با پیش‌‏اندازی بیشتر آن از 30 تا 40 درجه bTDC، مقدار آن افزایش می‌یابد. مقدار گاز گلخانه‌ای تولیدی CO₂ تقریباً، روند عکس تولید مونواکسیدکربن را طی می‌کند.

کلیدواژه‌ها

عنوان مقاله [English]

Investigating the influence of injection timing on the performance of a RCCI engine

نویسندگان [English]

Ayat Gharehghani
Amir Hossein Fakhari
Mahdi Aghahasani

School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

چکیده [English]

Reactivity-Controlled Compression Ignition (RCCI) is one of the attractive low-temperature combustion strategies because of its high efficiency, reduced fuel consumption, and good potential in reducing emissions. This type of combustion has gained attention in recent years due to global concerns regarding environmental degradation, strict emission regulations, reduction of oil reserves, and rising fossil fuel prices. In this research, an RCCI engine, with a fuel mixture of diesel and gasoline, simulated with the aid of computational fluid dynamics coupled with chemical kinetics. The AVL FIRE software employed for the simulations. The aim was to investigate the impacts of changing the diesel fuel injection timing on combustion and emissions. In this regard, the effects of changing the diesel fuel injection timing in the range of 20 to 40° bTDC on the in-cylinder pressure, heat release rate, combustion phase, and the amount of carbon monoxide, carbon dioxide, nitrogen oxides, and unburned hydrocarbons emissions investigated at a constant engine speed of 1150 rpm. One of the most important results of this study is the reduction of NO_X emissions by advancing fuel injection timing to 40° bTDC. Furthermore, with the advancement of diesel fuel injection timing, the combustion starts earlier. By raising the injection duration, the maximum in-cylinder pressure decreases, and the start of combustion delayed. As the fuel injection advances from 20 to 30° bTDC, the produced carbon monoxide decreases, and a further advancement from 30 to 40° bTDC, raises the amount of this pollutant. It is worth noting that the amount of CO₂ greenhouse gas has an almost negative relationship with carbon monoxide production.

کلیدواژه‌ها [English]

Low Temperature Combustion
RCCI
Start of Injection
Emission
CFD

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