کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
6474588 1424962 2017 9 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical study of formaldehyde and unburned methanol emissions of direct injection spark ignition methanol engine under cold start and steady state operating conditions
ترجمه فارسی عنوان
مطالعه عددی انتشار فرمالدئید و غیر متخلخل متانول موتور مستقیم موتور تزریق جرقه موتور متانول در شرایط سرد و شرایط عملیاتی حالت پایدار
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کلمات کلیدی
موتور احتراق مستقیم موتور تزریق، متانول، فرمالدئید، شروع سرد حالت پایدار، مطالعه عددی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


- Formaldehyde and unburned methanol emissions are numerically investigated.
- Cold start and steady state conditions are used to compare formaldehyde emission.
- Formaldehyde and unburned methanol are higher significantly for cold start mode.
- Cylinder temperature is the main factor that affects formaldehyde generation and consumption.

The effects of overall equivalence ratio, injection timing, and ignition timing on formaldehyde and unburned methanol emissions, cylinder temperature histories, and formaldehyde emission histories of a spark ignition direct injection stratified charge methanol engine during cold start and steady state conditions were simulated using computational fluid dynamics coupling the methanol chemical kinetics reaction mechanism. The model results show that the overall equivalence ratio is less than 0.43, and unburned methanol significantly higher for cold start mode. For steady state mode, when the overall equivalence ratio is less than 0.4, formaldehyde and unburned methanol emissions increase rapidly. When the overall equivalence ratio is larger than 0.4, formaldehyde and unburned methanol emissions are very low. Formaldehyde and unburned methanol emissions for steady state mode are significantly lower than for cold start mode. For steady state mode at engine speed 1600 rpm and brake mean effective pressure 0.67 MPa formaldehyde and unburned methanol emissions are reduced 90% and 98%, respectively, compared to cold start mode at the same overall equivalence ratio (0.5). Cylinder temperature is the main factor that affects formaldehyde generation and consumption. There is a rapid decrease due to oxidation at the corresponding position of the maximum cylinder temperature, after which formaldehyde is quickly generated for any operating conditions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 202, 15 August 2017, Pages 405-413
نویسندگان
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