Effects of External Mixture Formation and EGR Technique on a Diesel-Fueled PCCI Engine
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ORIGINAL CONTRIBUTION
Effects of External Mixture Formation and EGR Technique on a Diesel-Fueled PCCI Engine Girish Bhiogade1 • J. G. Suryawanshi2
Received: 1 September 2017 / Accepted: 30 October 2020 Ó The Institution of Engineers (India) 2020
Abstract Limitations on exhaust emissions of diesel engines have become increasingly stringent due to increasing awareness of environmental protection. This challenges diesel engine manufacturers to find a new balance between engine performance and emissions. Advanced combustion modes for diesel engines, such as homogeneous charge compression ignition (HCCI) and premixed charge compression ignition (PCCI), which can simultaneously reduce exhaust emissions and substantially improve thermal efficiency, have drawn increasing attention. In order to allow enough time to prepare the homogeneous mixture, the external mixture formation technique was used to achieve PCCI combustion. A device known as diesel vaporizer was used to produce diesel vapors. Diesel vapors mix with air at intake port of an engine to form homogeneous charge before combustion starts. Exhaust gas recirculation technique was used to control early ignition of the premixed charge. It was observed from the experimentations that the use of external mixture formation technique with EGR in PCCI engine decreases the NOx emissions by 43.57% but increases HC and CO emissions due to low temperature combustion. The brake thermal efficiency obtained was just 1.9% less than the conventional CI engine. Keywords CI engine Diesel vaporizer EGR PCCI engine NOx emission & Girish Bhiogade [email protected] 1
Department of Mechanical Engineering, Vignan’s IIT Visakhapatnam, Vishakhapatnam, India
2
Department of Mechanical Engineering, VNIT Nagpur, Nagpur, India
List of Symbols CI Compression Ignition CO Carbon Monoxide CO2 Carbon Dioxide HC Hydrocarbon NOx Oxides of Nitrogen EGR Exhaust Gas Recirculation LTC Low Temperature Combustion PCCI Premixed Charge Compression Ignition PREDIC Premixed Lean Diesel Combustion HiMICS Homogeneous Charge Intelligent Multiple Injection Combustion System MULDIC Multiple Lean Diesel Combustion NADI Narrow Angle Direct Injection SCCI Stratified Charge Compression Ignition UNIBUS Uniform Bulky Combustion System
Introduction The new emission standards are very challenging and will require a combination of strategies including the development of advance combustion system to reduce engine emissions, development of adequate, reliable and cost effective after treatment system. Diesel engines are widely used in heavy duty vehicles and other commercial applications due to its higher efficiency and durability. In diesel engines, NOx is formed in the hot stoichiometric regions, and PM is formed in fuel rich region [1, 2]. Thus, it is very difficult to reduce both NOx and PM emissions simultaneously through combustion improvements. To improve emissions without hampering the performance of internal combustion engine, new combustion concepts have been
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