1عضو هیات علمی دانشگاه محقق اردبیلی، اردبیل، ایران
2دانشجوی دکترای دانشگاه محقق اردبیلی
3کارشناس شرکت ملی گاز
تاریخ دریافت: 16 آبان 1396،
تاریخ بازنگری: 30 آذر 1396،
تاریخ پذیرش: 13 دی 1396
چکیده
سرعت سوزش متلاطم مخلوط سوخت و هوا به سرعت سوزش آرام آن بستگی دارد. دما، فشار، نسبت هم‌ارزی ( ) و نوع سوخت از فاکتورهای اساسی سرعت سوزش آرام هستند. در کار حاضر برای روشن شدن تاثیر ترکیب دو سوخت بنزین و گازطبیعی در گستره‌ی فشار 5-20 bar روی سرعت سوزش آرام، داده‌های تجربی فشار-زمان در طول فرآیند احتراق از بمب حرارتی کروی حجم ثابت به همراه تعلیقات مربوطه استخراج شده و برای محاسبه سرعت سوزش آرام از روی این داده‌ها از کد ترمودینامیکی چند منطقه‌ای بهره برده شده‌است. در طول دوره احتراق سرعت سوزش آرام مخلوط بنزین-هوا و گازطبیعی-هوا در نسبت هم-ارزی استوکیومتری و همچنین سرعت سوزش مخلوط‌های گازطبیعی-بنزین و هوا با درصدهای جرمی گازطبیعی 25% ،50%، 75% و 100% و فشار و دمای اولیه‌ی بترتیب500kPa و 333K برآورد شد. نتایج حاصله از مخلوط بنزین-هوا در مقایسه با گازطبیعی-هوا نشان داد که سرعت سوزش آرام گازطبیعی در رنج 5-20bar بیشتر از بنزین است. همچنین با استفاده از ترکیب گازطبیعی و بنزین، مشاهده شد که در فشارهای کمتر از20bar سرعت سوزش تحت شرایط حاکم برای حالت‌های 25% و50% جرمی گازطبیعی کمتر از 100% گاز طبیعی است.
Experimental study of laminar burning velocity for dual fuel (Gasoline-NG)-Air mixture using pressure record in a spherical combustion bomb at higher primary pressure
1Faculty of Engineering, University of Mohaghegh Ardabili, Iran
2PhD student in University of Mohaghegh Ardabili
3Engineer in Gas Company
چکیده [English]
Turbulent burning velocity of air-fuel mixture depends on laminar burning velocity and turbulent aspects. The main factors influencing laminar burning velocity are fuel type and pressure, temperature and equivalence ratio of the mixture. In the current work, a constant volume spherical bomb and its related equipments were used to capture experimental pressure-time data during combustion period. The data was defined as input to a multi zone thermodynamic code to calculate laminar burning velocity. The velocity was evaluated for gasoline-air and Natural Gas (NG)-air mixtures at stoichiometric equivalence ratio and NG-gasoline-air mixtures with NG mass percentage of 25%, 50% 75% and 100% at stoichiometric condition with initial pressure and temperature of 500kPa and 333K, respectively. The obtained results of gasoline-air mixtures in comparison to NG-air laminar burning velocity showed that the NG-air laminar burning velocity in the range of 5 to 20bar was higher than gasoline. For dual fuel NG-gasoline it was observed that at the stoichiometric condition when bomb pressure was lower than 20bar, the laminar burning velocities of 25% and 50%NG in dual case were lower than those of 100%NG.
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