THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

External Links

A COMPUTATIONAL FLUID DYNAMICS ANALYSIS ON STRATIFIED SCAVENGING SYSTEM OF MEDIUM CAPACITY TWO-STROKE INTERNAL COMBUSTION ENGINES

ABSTRACT
The main objective of the present work is to make a computational study of stratified scavenging system in two-stroke medium capacity engines to reduce or to curb the emissions from the two-stroke engines. The 3-D flows within the cylinder are simulated using computational fluid dynamics and the code Fluent 6. Flow structures in the transfer ports and the exhaust port are predicted without the stratification and with the stratification, and are well predicted. The total pressure and velocity map from computation provided comprehensive information on the scavenging and stratification phenomenon. Analysis is carried out for the transfer ports flow and the extra port in the transfer port along with the exhaust port when the piston is moving from the top dead center to the bottom dead center, as the ports are closed, half open, three forth open, and full port opening. An unstructured cell is adopted for meshing the geometry created in CATIA software. Flow is simulated by solving governing equations namely conservation of mass momentum and energy using SIMPLE algorithm. Turbulence is modeled by high Reynolds number version k-e model. Experimental measurements are made for validating the numerical prediction. Good agreement is observed between predicted result and experimental data; that the stratification had significantly reduced the emissions and fuel economy is achieved.
KEYWORDS
PAPER SUBMITTED: 2007-09-10
PAPER REVISED: 2007-12-28
PAPER ACCEPTED: 2008-03-03
DOI REFERENCE: https://doi.org/10.2298/TSCI0801033P
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2008, VOLUME 12, ISSUE Issue 1, PAGES [33 - 42]
REFERENCES
  1. Rosskemp, H., Hahnadorff, M., US Patent No. 6,598,568, July 29, 2003
  2. Blair, G. P., US patent No. 4,253,433, March 3, 1991
  3. Hill, B. W., et al., Reduction of Fuel Consumption of a Spark-Ignition Two-Stroke Cycle Engine, SAE paper 830093, 1983
  4. Jackson, N., et al., Understanding the CCVS Stratified EGR Combustion System, SAE paper 960837, 1996
  5. Woolf, K., Xiaofeng, Y., New Loop-Scavenging Two-Stroke Engine (in Chinese), Chinese patent No. 95209873, 1995
  6. Douglas, R., Stephenson, T., AFR and Emissions Calculations for Two-Stroke Cycle Engines, SAE paper 901599, 1990
  7. Sher, E., Scavenging the Two-Stroke Engine, Progress in Energy and Combustion Science, 16 (1990), 2, pp. 95-124
  8. Komatsu-Zenoah, Bopp, S. C., Experimental Study of the Scavenging and Combustion Processes in a Two-Stroke Cycle Research Engine, SAE paper 920183, 1992
  9. Ikeda, Y., et al., Flow Vector Measurements at the Scavenging Ports in a Fired Two-Stroke Engine, SAE transaction, Vol. 101, Section 3, pp. 635-645, Paper No. 920420, 1992
  10. Nomura, G., Nakamura. N., Development of a New Two-Stroke Engine with Poppet-Valves: TOYOTA S-2 Engine, in: A New Generation of Two-Stroke Engines for the Future?, 2nd ed., Tecnip Publications, Paris, 1993, pp. 314-328
  11. ***, FLUENT Program Code, User's Guide version 4.3, FLUENT Incorporated, Lebanon, N. H., USA, 1995
  12. Fulekar, M. H., Chemical Pollution - a Threat to Human Life, Indian Journal of Environ. Prot., 1 (1999), 3, pp. 353-359

© 2022 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence