A NUMERICAL STUDY OF NO AND SOOT FORMATION IN AN AUTOMOTIVE DIESEL ENGINE FUELED WITH DIESEL-BIODIESEL BLENDS

Yıl 2016, Sayı: 4, 27 - 35, 01.12.2016

Müjdat Fırat Şehmus Altun , Yasin Varol

Öz

In this paper, engine simulation results are presented to give information on the effect of diesel-biodiesel blends
on combustion and emission characteristics of a multiple injection automotive diesel engine. Numerical Study
was performed in Computational Fluid Dynamics (CFD) simulation software AVL-FIRE coupled to AVL-ESE
Diesel. An improved version of the ECFM-3Z combustion model has been applied coupled with advanced
Zeldovich and Kinetic models for NO and soot formation, respectively. The simulation results were validated
against the experimental results by comparing the in-cylinder pressure and heat release rate for diesel-biodiesel
blends at 2000 rpm under 100% load, and a maximum variation of 5% deviation on the peak cylinder pressure
and 4% for heat release rate was found. Simulation results revealed that with the increase of biodiesel amount in
the fuel, CO and soot emissions were reduced while NO increased at the simulated operating conditions. In
addition, in-cylinder NO and Soot mass fractions were found to be high at 20 and 10 CA ATDC, respectively.

Anahtar Kelimeler

Diesel Combustion, Biodiesel, NO and Soot Formation