Theoretical Investigation of Combustion Process in Dual Fuel Engines at Part Load Considering the Effect of Exhaust Gas Recirculation
محل انتشار: فصلنامه تحقیقات موتور، دوره: 14، شماره: 14
سال انتشار: 1388
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 196
فایل این مقاله در 12 صفحه با فرمت PDF قابل دریافت می باشد
- صدور گواهی نمایه سازی
- من نویسنده این مقاله هستم
استخراج به نرم افزارهای پژوهشی:
شناسه ملی سند علمی:
JR_ENGIN-14-14_006
تاریخ نمایه سازی: 11 اردیبهشت 1401
چکیده مقاله:
The dual fuel engines at part loads inevitably suffer from lower thermal efficiency and higher carbon monoxide
and unburned fuel emission. This work is carried out to investigate combustion characteristics of a dual fuel (dieselgas)
engine at part loads, using a single zone combustion model with detailed chemical kinetics for combustion of
natural gas fuel. The authors developed software in which the pilot fuel is considered as a subsidiary zone and a heat
source which is deriving from two superposed Wiebe’s combustion functions to account for its contribution to ignition
of gaseous fuel and the rest of total released energy. Chemical kinetics mechanism is consisted of ۱۱۲ reactions with
۳۴ species. This quasi-two zone combustion model is able to establish the development of the combustion process with
time and the associated important operating parameters, such as pressure, temperature, heat release rate (H.R.R) and
species concentration. Also, this model is able to calculate accumulated heat release, ignition delay and combustion
duration of gaseous fuel air mixture. Therefore this paper is an attempt to investigate the combustion phenomenon at
part loads and using hot exhaust gas recirculation (EGR) to improve the above mentioned drawbacks and problems.
By employing this technique, it is found that, low percentages of EGR, considering its thermal and radical effects,
have the positive effect on performance and emission parameters of dual fuel engines at part loads. Predicted values
show good agreement with corresponding experimental values in a special engine operating condition (۱/۴ load, ۱۴۰۰
rpm). Implications will be discussed in details.
کلیدواژه ها:
Quasi-Two Zone Combustion Model ، Chemical Kinetics ، Natural Gas ، Dual Fuel Engines ، EGR ، Quasi-Two Zone Combustion Model ، Chemical Kinetics ، Natural Gas ، Dual Fuel Engines ، EGR
نویسندگان