اثر تغيير طول و فشار پاشش سوخت بر عملكرد و آلايندگي موتور ديزل سواري

Fuel injection pressure and duration effects on passenger diesel engine performance and emissions

پارامترهايي كه امروزه نقش مهمي در عملكرد موتور و بهبود احتراق دارد، فشار پاشش سوخت و زمان‌بندي پاشش مي‌باشد. اين مطالعه به بررسي عددي اثرات تغييرات فشار پاشش سوخت بر آلايندگي و عملكرد موتور ديزلي در قالب شبيه‌سازي عددي توسط نرم‌افزارAVL-FIRE مي‌پردازد. در اين تحقيق با ثابت نگه داشتن ميزان مصرف سوخت و دور موتور مدت زمان پاشش اصلي از5 الي 12 درجه ميل‌لنگ تغيير داده شد و به ازاي اين تغييرات، آلايندگي موتور مورد ارزيابي قرار گرفت. نتايج نشان داد كه با كاهش مدت زمان پاشش سوخت، ميزان آلاينده دي‌اكسيد نيتروژن تا حدي افزايش و آلاينده دوده كاهش مي‌يابد

Improvement of existing vehicles to reduce fuel consumption and emissions due to factors such as the completion of fossil fuels, increasing fuel consumption, global warming and environmental issues for governments and industry is essential, For this reason, direct injection diesel engines are widely used in automotive and industrial applications. With tightening emissions standards and a desire to build an engine with higher efficiency, better understanding of combustion engines is essential to the next step in order to optimize engine design to reduce emissions and improve engine performance picked up. One of the parameters that are important role in the treatment of combustion engine is fuel injection pressure and injection timing. This study examines a number of changes on emissions and performance of diesel engine with fuel injection pressure changing using AVL-FIRE numerical simulation software. In this study, keeping the fuel consumption and engine speed for main injection of 5 to 12 degrees crankshaft was changed and for these changes, engine emissions were evaluated. The results showed that by reducing fuel injection time the amount of pollutants nitrogen dioxide increased and soot emissions reduced.