توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Simultaneously Reduction of NOx and Soot Emissions in a partially premixed gasoline fueled compression ignition
نویسنده(ها): ،
اطلاعات انتشار: همایش ملی شیمی پاک، سال
تعداد صفحات: ۱۵
The primary target of emission legislation for CI engines across the world has been the reduction of the emissions of nitric oxides (NOx) and soot. This paper is presented in order to elucidate some numerical investigations related to a partially premixed gasoline fuelled CI engine by means of three dimensional CFD code. Comparing with the diesel fuel, gasoline has lower soot emission because of its higher ignition delay. The application of double injection strategy reduces the maximum heat release rate and leads to the reduction of NOx emission. For validation of the model, the results for the mean in–cylinder pressure, H.R.R., NOx and soot emissions are compared with the corresponding experimental data and show good levels of agreement. The effects of injection characteristics such as, injection duration, spray angle and EGR rate on combustion process and emission formation are investigated yielding the determination of the optimal point thereafter. The results indicated that optimization of injection characteristics leads to simultaneous reduction of NOx and soot emissions with negligible change in IMEP.<\div>

۲The Influence of Fuel Temperature on Energy, Exergy and Exhaust Emissions of a DI Diesel Engine Under Various Operating Loads
اطلاعات انتشار: همایش ملی شیمی پاک، سال
تعداد صفحات: ۱۶
In the present article, the effects of fuel temperature on first and second law terms and exhaust emissions under the various operating loads in a DI diesel engine have been investigated. The combustion process and emissions production are simulated utilizing a three dimensional CFD code. The second law terms have been computed by a developed FORTRAN code. The calculations are carried out for three operating loads (50%, 75% and 100% load) and for each of them, five injected fuel temperatures have been mentioned: Tfuel =353, 383K as low and Tfuel =463, 493K as high temperature cases. The obtained results indicated that increasing the injected fuel temperature leads to increase in fuel spray atomization, better air–fuel mixing and improves combustion characteristics. Also, reduced spray penetration due to increased evaporation prevents wall–film formation and considerably decreases soot mass fraction. Mean pressure, temperature, and NOx mass fraction are increased due to improved combustion. Also, increasing the injected fuel temperature causes to increase the indicated work and heat loss availabilities, and decreases the exhaust gas availability and combustion irreversibilities.<\div>
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