This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Transient Gas Exchange Simulation and Uniflow Scavenging Analysis for a Unique Opposed Piston Diesel Engine
Technical Paper
2016-01-1087
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
To achieve more stringent exhaust emission regulations will face more and more daunting challenges nowadays. It needs more new technologies to improve the IC engine performance but needing higher costs in order to meet Euro 6 and EPA standards in USA. Recently the opposed-piston engine (OPE) has been treated as the promising product to meet these new regulations but relatively lower costing. Although two-stroke OPE owning inherent thermal efficiency and power density advantages, the inefficient scavenge efficiency appears to become the main obstacle to enhance combustion efficiency whilst reducing exhaust gas emission. For the improvement of scavenge efficiency the transient gas exchange simulation was carried out for multiple Cases here, including two intake port configurations at various back pressures in exhaust system and two port timings. The effects of exhausting back pressure, porting timing and intake port layout on scavenging and trapped air mass in cylinder all were investigated by transient CFD simulation including blow-down and scavenging. The calculated results showed that for Case02 that intake port entrance orientation with a right tilt angle referred to baseline, the scavenge efficiency is relatively higher than one with left tilt angle in Case01 for different exhausting back pressures, also for trapped fresh air mass. The turbulence kinetic energy is extremely sensitive to back pressure in exhaust chamber. The investigation was also found that the port timing is also quite important for scavenging process and pump losses, and there will be a little increase of scavenge efficiency by about 2-3% via adjusting port timing for both Cases, and the net trapped masses are approximate to each other but with less fresh air leakage for new port timing. Apparently, the exhaust back pressure will impose much more considerable influence on the entire scavenging performance than the port timing, as using uniflow scavenge mode in a two-stroke opposed piston diesel engine.
Recommended Content
Authors
Topic
Citation
Changming, H. and Sichuan, X., "Transient Gas Exchange Simulation and Uniflow Scavenging Analysis for a Unique Opposed Piston Diesel Engine," SAE Technical Paper 2016-01-1087, 2016, https://doi.org/10.4271/2016-01-1087.Also In
References
- Joey Daubert , Lwaiczak Andy Engine efficiency: The Ecomotors solution Propulsion Research Institute April 14 2012
- Pirault Jean-Pierre , Flint Martin Opposed piston engine renaissance - Power for the future Achates power, Inc 2010
- Laurence Fromm , Herold Randy , Koszewnik John Modernizing the opposed-piston engine for more efficiency military ground vehicle applications 2012 Ndia ground vehicle systems engineering and technology symposium Michigan August, 2012, 14-16
- Regner , G. , Herold , R. , Wahl , M. , Dion , E. et al. The Achates Power Opposed-Piston Two-Stroke Engine: Performance and Emissions Results in a Medium-Duty Application SAE Int. J. Engines 4 3 2726 2735 2011 10.4271/2011-01-2221
- Hofbauer , P. Opposed Piston Opposed Cylinder (opoc) Engine for Military Ground Vehicles SAE Technical Paper 2005-01-1548 2005 10.4271/2005-01-1548
- Flint , M. , Pirault , J.P. Opposed Piston Engines: Evolution, Use, and Future Application SAE International Warrendale 2009 978-0-7680-1800-4/R378
- Hofbauer , P. Stroke of genius opoc takes two Engine Technology International June 1999
- Franke , M. , Huang , H. , Liu , J. , Geistert , A. et al. Opposed Piston Opposed Cylinder (opoc™) 450 hp Engine: Performance Development by CAE Simulations and Testing SAE Technical Paper 2006-01-0277 2006 10.4271/2006-01-0277
- Ping , H. Analysis of Self-Balance Characteristics of OPOC Engine Advanced Materials Research 211-212 93 96
- Pacific Network The analysis and comparison of Subaru and Porsche opposed-cylinder engine [EB/OL] http://info.52che.com/taizhou/news-287653.html August 26 2011
- Foudray , H. and Ghandhi , J. Scavenging Measurements in a Direct-Injection Two-Stroke Engine SAE Technical Paper 2003-32-0081 2003 10.4271/2003-32-0081
- Fleck , B. , Fleck , R. , Kee , R. , Hu , X. et al. CFD Simulation and Validation of the Scavenging Process in a 125cc 2-Stroke Racing Engine SAE Technical Paper 2006-32-0061 2006 10.4271/2006-32-0061
- Walker , J. R. Exploring Power Technology South Holland The Goodheart-Willcox Co., Inc.
- He Changming , Sichuan Xu , Chaofeng Zuo Multivalve Intake Port Parametric Design And Performance Optimization of the Horizontal Diesel Engine Mechanika 17 6 643 648
- Kalkstein , J. , Röver , W. , Campbell , B. , Zhong , L. et al. Opposed Piston Opposed Cylinder (opoc™) 5/10 kW Heavy Fuel Engine for UAVs and APUs SAE Technical Paper 2006-01-0278 2006 10.4271/2006-01-0278
- Changming , H. and Sichuan , X. The Investigation and Application of Variable Tumble Intake System on a GDI Engine SAE Int. J. Engines 7 4 2022 2034 2014 10.4271/2014-01-2885
- Winkler , F. , Schögl , O. , Oswald , R. , and Kirchberger , R. Development of a Low Emission Two-Stroke Engine with Low Pressure Fuel Injection SAE Technical Paper 2006-32-0065 2006 10.4271/2006-32-0065
- Yoshi Kobayashi , Uenoyama Kazuyuki , and Yoshida Yukiteru Low Exhaust Emission System for Small Two-Stroke Cycle Engines Mitsubishi Heavy Industries, Ltd. Technical Review 38 3 Oct 2001
- Branislav Basara , Krajnović Siniša , and Girimaji Sharath PANS Methodology Applied to Elliptic-Relaxation Based Eddy Viscosity Transport Model, Turbulence and Interactions NNFM 110 63 69