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Technical Paper
Thorsten Langhorst, Olaf Toedter, Thomas Koch, Patrick Gonner, Matthew Borst, Richard Morton
Abstract Particulates and nitrogen oxides comprise the main emission components of the Diesel combustion and therefore are subject to exhaust emission legislation in respective applications. Yet, with ever more stringent emission standards and test-procedures, such as in passenger vehicle applications, resulting exhaust gas after-treatment systems are quite complex and costly. Hence, new technologies for emission control have to be explored. The application of non-thermal plasma (NTP) as a means to perform exhaust gas after-treatment is one such promising technology. In several publications dealing with NTP exhaust gas after-treatment the plasma state was generated via dielectric barrier discharges. Another way to generate a NTP is by a corona high-frequency discharge. Hence, in contrast to earlier publications, the experiments in this publication were conducted on an operated series-production Diesel engine with an industrial pilottype corona ignition system.
Journal Article
Jacqueline O'Connor, Meghan Borz, Daniel Ruth, Jun Han, Chandan Paul, Abdurrahman Imren, Daniel Haworth, Jonathan Martin, Andre Boehman, Jian Li, Kevin Heffelfinger, Samuel McLaughlin, Richard Morton, Arne Andersson, Anders Karlsson
Abstract This paper describes a novel design and verification process for analytical methods used in the development of advanced combustion strategies in internal combustion engines (ICE). The objective was to improve brake thermal efficiency (BTE) as part of the US Department of Energy SuperTruck program. The tools and methods herein discussed consider spray formation and injection schedule along with piston bowl design to optimize combustion efficiency, air utilization, heat transfer, emission, and BTE. The methodology uses a suite of tools to optimize engine performance, including 1D engine simulation, high-fidelity CFD, and lab-scale fluid mechanic experiments. First, a wide range of engine operating conditions are analyzed using 1-D engine simulations in GT Power to thoroughly define a baseline for the chosen advanced engine concept; secondly, an optimization and down-select step is completed where further improvements in engine geometries and spray configurations are considered.
Technical Paper
Richard Morton, Romain Riviere, Stephen Geyer
Abstract A study of the crank and gear-train dynamics of a two-stroke opposed piston diesel engine design uncovered a disconnect between the thermodynamic process and its conversion to mechanical work. The classic two-stroke opposed piston design phases the intake piston to lag the exhaust piston in order to achieve favorable gas exchange, overcoming the disadvantage of piston-controlled ports. One result of this is that significantly more of the engine torque is delivered by the leading crank than from the trailing one. This paper will examine why this torque difference occurs showing that it is not simply a proportioning of the available thermodynamic work but a result of a fundamental mechanical loss mechanism that limits the achievable brake efficiency of this engine architecture. This analysis will provide a basis for developing effective design solutions to overcome the mechanical loss by providing an understanding of this loss mechanism.
Technical Paper
Kéli Alark, Richard Morton, Roscoe Carter
While most of the industrialized world's diesel fuel usage for on-highway applications is shifting toward ultra-low sulfur diesel (ULSD) (≤ 50 ppm) or “sulfur-free” (≤ 15 ppm) content fuel, some markets for high-sulfur diesel (HSD) fuel still persist. Among these are off-roadway engines, marine, military fuel use worldwide, and general diesel fuel use in the Middle East and in some developing markets. A stock-production medium-duty engine underwent a dynamometer durability test with high-sulfur (10,000 ppm) diesel to approximate the worst case for sulfur content among global road fuels, and medium-high sulfur diesel (3,000 ppm) for engine break-in. Testing was completed successfully; however performance degradation with these fuels was observed which might have practical significance in other diesel applications for these markets.
Viewing 1 to 4 of 4