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Assanis, Dimitris
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Experimental Study of Spark-Ignition Combustion using the Anode-off Gas from a Solid Oxide Fuel Cell

Assanis & Associates, Inc.-Dimitris Assanis
Stony Brook University-Zhongnan Ran, Deivanayagam Hariharan, Sotirios Mamalis
  • Technical Paper
  • 2020-01-0351
To be published on 2020-04-14 by SAE International in United States
Worldwide energy demands have been drastically increasing in recent decades causing accelerated depletion of fossil fuel resources and thus increasing the generation of air pollutants and greenhouse gases. Solid oxide fuel cells (SOFC) have attracted attention in recent years as a novel, innovative and more environmentally friendly energy conversion technology for electrical energy generation. SOFCs can generate electrical power with high net conversion efficiency while emitting relatively low pollutant emissions in comparison to other distributed energy generation systems used today, but they have also exhibited limited robustness and versatility and load following capability. Recent studies have explored hybridized systems, which combine a SOFC with another energy conversion device, e.g. gas turbines or internal combustion engines, to increase the global efficiency of the system. This study is focused on exploring a hybrid SOFC-internal combustion engine system that can use the anode off-gas as a fuel for the engine. The engine can be used to provide additional power to the system and also serve as a means for balance of plant. Although this concept appears to be…
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Effects of Engine Speed on Spray Behaviors of the Engine Combustion Network “Spray G” Gasoline Injector

Robert Bosch LLC-Mohammad Fatouraie
University of Melbourne-Joshua Lacey, Michael Brear
Published 2018-04-03 by SAE International in United States
Non-reacting spray behaviors of the Engine Combustion Network “Spray G” gasoline fuel injector were investigated at flash and non-flash boiling conditions in an optically accessible single cylinder engine and a constant volume spray chamber. High-speed Mie-scattering imaging was used to determine transient liquid-phase spray penetration distances and observe general spray behaviors. The standardized “G2” and “G3” test conditions recommended by the Engine Combustion Network were matched in this work and the fuel was pure iso-octane. Results from the constant volume chamber represented the zero (stationary piston) engine speed condition and single cylinder engine speeds ranged from 300 to 2,000 RPM. As expected, the present results indicated the general spray behaviors differed significantly between the spray chamber and engine. The differences must be thoughtfully considered when applying spray chamber results to guide spray model development for engine applications. Overall, increases in engine speed correlated well with enhanced vaporization, loss of distinct plume structure, and enhanced spray collapse which led to reductions in wetted-footprint area. Furthermore, while loss of distinct plume structures appeared to be strongly dependent…
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Computational Development of a Dual Pre-Chamber Engine Concept for Lean Burn Combustion

Hyundai-Kia America Technical Center Inc-Nayan Engineer, Paul Neuman
University of Michigan-Dimitris Assanis, Margaret Wooldridge
Published 2016-10-17 by SAE International in United States
Pre-chambers are a means to enable lean burn combustion strategies which can increase the thermal efficiency of gasoline spark ignition internal combustion engines. A new engine concept is evaluated in this work using computational simulations of non-reacting flow. The objective of the computational study was to evaluate the feasibility of several engine design configurations combined with fuel injection strategies to create local fuel/air mixtures in the pre-chambers above the ignition and flammability limits, while maintaining lean conditions in the main combustion chamber. The current work used computational fluid dynamics to develop a novel combustion chamber geometry where the flow was evaluated through a series of six design iterations to create ignitable mixtures (based on fuel-to-air equivalence ratio, ϕ) using fuel injection profiles and flow control via the piston, cylinder head, and pre-chamber geometry. The desirable and undesirable features that guided the design progression are presented. Major combustion chamber design iterations involved changes to the pre-chambers position relative to the cylinder head deck plane, azimuthal orientation of the pre-chambers, and piston crown geometry. Further criteria were…
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