تحقیقات موتور

تحقیقات موتور

توسعة سازوکار سینتیک شیمیایی جدید برای احتراق مخلوط سوخت زیست‌‏دیزل و گاز طبیعی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشکدة مهندسی مکانیک، دانشگاه صنعتی امیرکبیر، تهران، ایران
2 دانشکدة مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران
چکیده
استفاده از گاز طبیعی-زیست‏‌دیزل در موتورهای احتراق سرد، با توجه به ویژگی‌‏های این دو سوخت، اخیراً مورد توجه محافل علمی احتراقی قرار گرفته است. فراوانی، قیمت کم و احتراق پاک گاز طبیعی و همچنین تجدیدپذیر بودن زیست‏‌دیزل از عوامل گرایش به این دو نوع سوخت در دنیاست. در این راستا آزمایش‌‏های تجربی مختلفی صورت پذیرفته است و در برای توسعه هرچه بیشتر نیازمند استفاده از شبیه‏‌سازی‌‏های عددی خواهد بود. مشکل اصلی در این مسیر، فقدان سازوکار احتراق زیست‏‌دیزل-گاز طبیعی است. در این راستا، یک سازوکار دقیق شامل 153 گونه و 727 واکنش، ارائه شده است. برای گاز طبیعی، سازوکار Drost با 49 گونه و 332 واکنش، با ترکیب گاز طبیعی با 90% CH4، 9% C2H6 و 1% C3H8 در نظر گرفته شده است. برای زیست‌‏دیزل از سازوکار Zhang با 156 گونه و 589 واکنش استفاده شده است که ترکیبات آن شامل 25% MD، 25% MD9D و 50% n-هپتان است. فرآیند توسعة سازوکار با روش های DRG، DRGEP، تحلیل شار مسیر، تحلیل حساسیت و QSSA صورت پذیرفته است. در بحث صحه‌‏سنجی نیز، مقایسه زمان‌های تأخیر احتراق سازوکارهای اصلی و توسعه‌یافته نشان می دهد که خطای میانگین محاسباتی (AME) بترتیب 10.77% برای 0% - NG و 11.2% برای 0% زیست‏‌دیزل است. همچنین AME سرعت شعله برای 0% زیست‌‏دیزل و 0% NG به ترتیب 7% و 8.3% محاسبه شده است. برای اطمینان بیشتر، از سازوکار توسعه یافته در شبیه‌‏سازی CFD یک موتور RCCI استفاده شده و نتایج قابل قبولی بدست آمده است. 
کلیدواژه‌ها

عنوان مقاله English

Developing a reduced chemical kinetic mechanism for natural gas/biodiesel mixture ‎combustion

نویسندگان English

Emad Aminian 1
Ayat Gharehghani 2
Mostafa Mirsalim 1
1 Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran
2 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده English

The use of natural gas-biodiesel in LTC engines, according to their characteristics, Recently, it has attracted the attention of combustion scientific circles. Natural gas abundance, clean combustion characteristics relatively low cost among various fuels, and the renewability of biodiesel make them attractive fuel in combustion engines. In this line, various experimental tests using natural gas-biodiesel fuels have been performed until now. So for further development, the use of numerical simulations can be effective. The main problem in this way is the lack of a precise combustion mechanism for biodiesel-natural gas. In this regard, an accurate mechanism which consists of 153 species and 727 reactions is developed from two up-to-date mechanisms. For natural gas, the Drost mechanism, which consists of 49 species and 332 reactions and is considered as 90% CH4, 9% C2H6, and 1% C3H8, and for biodiesel, the Zhang mechanism with 156 species and 589 reactions has been employed, which is considered as 25% MD, 25% MD9D and 50% n-Heptane. In the development process, DRG, DRGEP, sensitivity analysis, path flux analysis, and QSSA methods are used. Comparing ignition delay times of based and developed mechanisms revealed that arithmetical mean error (AME) is 10.77% for 0%-NG and 11.2% for 0%-biodiesel, respectively. In the 1-D simulation, flame speed is calculated and the AME for 0%-biodiesel and 0%-NG is 7% and 8.3%, respectively. In the end, the RCCI engine CFD simulation is verified again to the develop mechanism appropriately.

کلیدواژه‌ها English

Chemical Kinetic Mechanism
Biodiesel
Natural Gas
Ignition Delay
Flame Speed
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دوره 71، شماره 4 - شماره پیاپی 77
مقالات انگلیسی
زمستان 1403
صفحه 15-32

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