NDLI: Performance and Emissions Analysis of Partially Pre-Mixed Charge Compression Ignition Combustion

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Performance and Emissions Analysis of Partially Pre-Mixed Charge Compression Ignition Combustion

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Srivatsa, Charu Vikram Mattson, Jonathan Depcik, Christopher
Copyright Year	2018
Abstract	In order to investigate the performance and emissions behavior of a high compression ratio Compression Ignition (CI) engine operating in Partially Premixed Charge Compression Ignition (PPCI) mode, a series of experiments were conducted using a single cylinder naturally aspirated engine with a high-pressure rail fuel injection system. This included a moderately advanced direct injection strategy to attempt PPCI combustion under low load conditions by varying the injection timing between 25° and 35° Before Top Dead Center (BTDC) in steps of 2.5°. Furthermore, during experimentation the fuel injection pressure, engine speed, and engine torque (through variance of the fuel injection quantity) were kept constant. In-cylinder pressure, emissions, and performance parameters were measured and analyzed using a zero-dimensional heat release model. Compared to the baseline conventional 12.5° BTDC injection, in-cylinder pressure and temperature was higher at advanced timings for all load conditions considered. Additionally, NOx, PM, CO, and THC were higher than conventional results at the 0.5 N-m load condition. While PM emissions were lower, and CO and THC emissions were comparable to conventional injection results at the 1.5 N-m load condition between 25° and 30° BTDC, NOx emissions were relatively high. Hence, there was limited success in beating the NOx-PM tradeoff. In addition, since Start of Combustion (SOC) occurred BTDC, the resulting higher peak combustion pressures restricted the operating condition to lower loads to ensure engine safety. As a result, further investigation including Exhaust Gas Recirculation (EGR) and/or variance in fuel Cetane Number (CN) is required to achieve PPCI in a high compression ratio CI engine.
File Format	PDF
ISBN	9780791852118
DOI	10.1115/IMECE2018-86410
Volume Number	Volume 8A: Heat Transfer and Thermal Engineering
Conference Proceedings	ASME 2018 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2018-11-09
Publisher Place	Pittsburgh, Pennsylvania, USA
Access Restriction	Subscribed
Subject Keyword	Compression Temperature Torque Ignition Combustion Fuels Pressure Stress Engines Emissions Rails High pressure (physics) Heat Exhaust gas recirculation Diesel engines Tradeoffs Nitrogen oxides Safety Naturally aspirated engines Cylinders
Content Type	Text
Resource Type	Article

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