This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Heat Release and Emissions Results from a D.I.Diesel with Special Shrouded Intake Valves
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 24, 1997 by SAE International in United States
Annotation ability available
This paper describes the results of an experimental programme designed to investigate some effects of intake flow-generated turbulence on rates of combustion and emissions formation in a 91mm bore direct injection diesel engine. Swirl and squish were eliminated as far as possible, in order to isolate the desired effects. This was achieved by re-modelling the inlet port and by replacing the deep bowl piston cavity with a flat-topped version, with the same compression ratio.
Tests were carried out with three inlet valves: a standard engine Valve (“A”) and two drilled shrouded valves, one with 15 x 6 mm dia. holes (“B”) and one with 40 x 3.5 mm dia. holes (“C”). The turbulence characteristics associated with each valve were first determined on a steady flow rig, using LDA based surveys of velocity distributions at different downstream distances. The objective was to measure absolute levels of turbulence intensity and to study the subsequent rate of decay.
Engine test results at 1200 rev/min showed significant differences in ISFC, heat release period and NOx emissions between valves “B” and “C”, for a given air fuel ratio, whilst smoke levels remained the same. These differences were not observed at 1600 rev/min.
The results appear to confirm that intake generated turbulence (as opposed to bulk flow) chartacteristics can have significant effects on rates of fuel-air mixing combustion and pollutant formation in high speed DI diesel engines, at least under some operating conditions.
|Technical Paper||CFD parametric analysis of the combustion chamber shape in a small HSDI Diesel engine|
|Technical Paper||The Origins of Nanoparticle Modes in the Number Distribution of Diesel Particulate Matter|
CitationTimoney, D., Brophy, B., and Smith, W., "Heat Release and Emissions Results from a D.I.Diesel with Special Shrouded Intake Valves," SAE Technical Paper 970900, 1997, https://doi.org/10.4271/970900.
Diesel Engine Combustion Processes and Emission Control Technologies
Number: SP-1246; Published: 1997-02-24
Number: SP-1246; Published: 1997-02-24
- Smith, W. J. Timoney, D.J. “On the relative Roles of Fuel Spray Kinetic Energy and Engine Speed in Determining Mixing Rates in D.I. Diesel Engines” Paper 95-ICE-8 ASME Spring Technical Conference Marietta, OH April 1995
- Timoney, D.J. Smith, W. J. “Influences of Fuel Injection and Air Motion Energy Sources of Fuel-Air Mixing Rates in a DI Diesel Combustion System” SAE Paper No. 960035 SAE SP-1159 1996
- Heywood, J.B. “Fluid motion within the cylinder of internal combustion engines - the 1986 Freeman Scholar Lecture” Journal of Fluids Engineering 109 March 1987
- Arcoumains, C. Whitelaw, J.H. “Fluid Mechanics of internal combustion engines - a review” Proc. IMechE 1987 201 C1 1987
- Cipolla, G Pyglisi, A. Vafidis, C. “In-cylinder velocity field measurements in a motored diesel engine” SAE Paper No. 870373 1987
- Monaghan, M.L. Pettifer, H.F. “Air motion and its effect on diesel performance and emissions” SAE Paper No. 810255 1981
- Murakami, A Sakimoto, M Arai, M. Hiroyasu, H. “Measurement of turbulent flow in the combustion chamber of a D.I. diesel engine” SAE Paper No. 900061 1990
- Stephenson, P.W Claybaker, P.J. Rutland, C.J. “Modelling the Effects of Intake Generated Turbulence and Resolved Flow Structures an Combustion an DI Diesel Engines” SAE Paper No. 960634 SAE SP-1169 1996
- Magnussen, B.F. Hjertager, B.H. “On Mathematical Modelling of Turbulent Combustion with Special Emphasis on Soot Formation and Combustion” 16th Symposium (International) on Combustion 719 729 The Combustion Institute 1976
- Reynolds, W.C. “Modelling of Fluid Motions in Engines - An Introductory Overview” Mattavi J.N. Amann C.A. Combustion Modelling in Reciprocating Engines 41 68 Plenum Press 1980
- Timoney, D.J. “Problems with Heat Release Analysis in D.I. Diesels” Paper No. 870270 SAE Transactions 1987
- Timoney, D.J. “Energetics of fuel-air mixing in D.I. diesel engines” Proc. of the International centre for Heat and Mass Transfer 26 Spalding D. Brian Afgan N.H. Hemisphere Publishing Corporation 1989 189 199
- Smith, W. J. “Estimation of Air Motion Kinetic Energy Dissipation Rates in a D.I. Diesel Combustion System” SAE 960876 SAE International Congress and Exposition 1996