ADVANCED NUMERICAL AND EXPERIMENTAL STUDIES ON CI ENGINE EMISSIONS

Year 2018, Volume: 4 Issue: 4 - Special Issue 8: International Technology Congress 2017, Pune, India, 2234 - 2247, 10.04.2018

Hasan Köten

https://doi.org/10.18186/journal-of-thermal-engineering.434044

Cited By: 12

Abstract

In these studies, three important
works examined to get ultra-low emission for a single cylinder diesel engine.
The first study was performed for single fuel and compression ratio (CR),
intake and exhaust valve timings, mass flow rate were optimized for a range of
engine speed. Then for the same engine injection parameters such as start of
injection (SOI), injector cone angle, and split injection structures were
examined to get optimum parameters for the diesel engine. In CR studies,
different combustion chambers were tested according to injector cone angles and
fuel-wall interaction. In the second study, in addition to the above studies,
dual fuel compressed biogas (CBG) and diesel combustion were analyzed under
different engine loads both experimentally and computationally. Optimized
single fuel diesel cases were compared with CBG + Diesel dual fuel cases which
employed port injection for CBG fuel. In dual fuel engine applications, CBG
fuel and air mixture is induced from intake port and this air-fuel mixture is
ignited by pilot diesel fuel near top dead center (TDC). In dual fuel engine
mode, exhaust emissions reduced considerably especially in NOx and particulate
matter (PM) because of methane (CH4) rate and optimized engine parameters. The
third study is focused on aftertreatment systems to minimize residual exhaust
emissions. The emissions of the diesel engines consist of various harmful
exhaust gases such as carbon monoxide (CO), particulate matter (PM),
hydrocarbon (HC), and nitrogen oxides (NOx). Several technologies have been
developed to reduce diesel emissions especially NOx reduction systems in last
decades. The most promising NOx emission reduction technologies are exhaust gas
recirculation (EGR) system to reduce peak cylinder temperature that reduces NOx
form caused by combustion and active selective catalyst reduction (SCR) system
using reducing agent such as urea-water-solution for exhaust aftertreatment
system. In this study, computational fluid dynamic (CFD) methodology was
developed with conjugate heat transfer, spray, deposit and chemical reaction
modeling then emission prediction tool was developed based on the CFD results
with deposit prediction mechanism. CFD and deposit results were correlated with
image processing tool in flow test bench.

Keywords

Experimental Study, CI Engine, Emission, Optimization, Aftertreatment

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