This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Application on Laser Rayleigh Scattering to a Reciprocating Model Engine
Annotation ability available
Sector:
Language:
English
Abstract
The Rayleigh light scattering technique has been used to quantify the mean and fluctuating concentration of a passive scalar used to simulate fuel injection in a reciprocating, two-stroke model engine motored at 200 rpm in the absence of compression. The transient concentration field, which results from injection of Freon-12 vapour through the centre of an axisymmetrically located permanently open valve, has been investigated for injection timings of 40 deg. before and at top-dead-centre as a function of spatial position and crank angle.
The purpose-built Rayleigh system, with gated digital data acquisition and software dust particle filtering, was first evaluated in a Freon-12 free jet by comparing results to those obtained with a sampling probe. At low concentration fluctuations and independent of particle density the agreement between the two methods is excellent but at high concentration fluctuations and particle density the Rayleigh system overestimates the Freon-12 mole fraction by up to ∼10% for reasons which are discussed.
The results obtained in the model engine indicate that the Freon-12 concentration field expressed in terms of ensemble-averaged mole fractions and rms of concentration fluctuations, is dominated by the high momentum transient jet which, in the near field, exhibits similar trends to the steady jet. Impingement of the jet onto the flat piston improves mixing giving rise to nearly uniform concentration fluctuations of ∼10%.
Recommended Content
Authors
Topic
Citation
Arcoumanis, C., Green, H., and Whitelaw, J., "The Application on Laser Rayleigh Scattering to a Reciprocating Model Engine," SAE Technical Paper 840376, 1984, https://doi.org/10.4271/840376.Also In
References
- Melton R.B. “Diesel Engine Fuel Injection Viewed as a Jet Phenomenon” SAE Paper 710132 1971
- Adler D. Lyn W.T. “The Evaporation and Mixing of a Fuel Spray in a Diesel Air Swirl” Proc. I Mech. Engrs 184 1969
- Rife J. Heywood J.B. “Photographic and Performance Studies of Diesel Combustion with a Rapid Compression Machine” Paper 740948 , SAE Transactions 83 1974
- Witze P.O. “The Impulsively Started Incompressible Turbulent Jet” SAND 80-8617 1980
- Martinelli L. Reitz R.D. Bracco F.V. “Comparison of Computed and Measured Dense Spray Jets” Ninth International Colloquium on Dynamics of Explosions and Reactive Systems Poitiers 1983
- Sinnamon J.F. Lancaster D.R. Steiner J.C. “An Experimental and Analytical Study of Engine Fuel Spray Trajectories” Paper 800135 , SAE Transactions 89 1980
- Haselman L.C. Westbrook C.K. “A Theoretical Model for Two-Phase Fuel Injection in Stratified Charge Engines” SAE Paper 780318 1978
- Morris C.J. Dent J.C. “The Simulation of Air Fuel Mixing in High Swirl Open Chamber Diesel Engines” Proc. I. Mech. Engrs 190 1976
- Turns S.R. Rau N. “Transient Gas Jet Penetration and Growth in a Swirling Flow” Proc. Symposium on Flows in Internal Combustion Engines, ASME Winter Annual Meeting Phoenix November 1982
- Shardanand Rao A.D. Prasad “Absolute Rayleigh Scattering Cross Sections of Gases and Freons of Stratospheric Interest in the Visible and Ultraviolet Regions” NASA TN D-8442
- Graham S.C. Grant A.J. Jones J.M. “Transient Molecular Concentration Measurements in Turbulent Flows Using Rayleigh Light Scattering” AIAA J. 12 8 1974
- Dyer T.M. “Rayleigh Scattering Measurements of Time-Resolved Concentration in a Turbulent Propane Jet” AIAA J. 17 8 1979
- Escoda M.C. Long M.B. “Rayleigh Scattering Measurements of the Concentration Field in Turbulent Jets” AIAA J. 21 1 1983
- Pitts W.M. Kashiwagi T. “The Application of Laser-Induced Rayleigh Light Scattering to the Study of Turbulent Mixing” NBSIR 83-2641 1983
- Robben F. “Comparison of Density and Temperature Measurements using Raman Scattering and Rayleigh Scattering” “Combustion Measurements” Goulard R. 1976
- Cheng R.K. Bill R.G. Robben F. “Experimental Study of Combustion in a Turbulent Boundary Layer” 18th Symposium (International) on Combustion The Combustion Institute 1981
- Ng T-M.T. “Experimental Study of a Chemically Reacting Turbulent Boundary Layer” Ph.D. Thesis Lawrence Berkeley Laboratory, University of California September 1981
- Dyer T.M. “Characterization of One-and Two-Dimensional Homogeneous Combustion Phenomena in a Constant Volume Bomb” Paper 790353 , SAE Transactions 88 1979
- Rambach G.D. Dibble R.W. Hollenbach R.E. “Velocity and Temperature Measurements in Turbulent Diffusion Flames” SAND 79-8775 1980
- Dibble R.W. Hollenbach R.E. “Laser Rayleigh Thermometry in Turbulent Flames” 18th Symposium (International) on Combustion The Combustion Institute 1981
- Smith J.R. “Turbulent Flame Structure in a Homogeneous-Charge Engine” SAE Paper 820043 1982
- Bilger R.W. Dibble R.W. “Differential Molecular Diffusion Effects in Turbulent Mixing” Combustion Science and Technology 28 1982
- Dibble R.W. Rambach G.D. Hollenbach R.E. Ringland J.T. “Simultaneous Measurement of Velocity and Temperature in Flames using LDV and CW Laser Rayleigh Thermometry” SAND 81-8800 1981
- Arcoumanis C. Bicen A.F. Vlachos N.S. Whitelaw J.H. “Effects of Flow and Geometry Boundary Conditions on Fluid Motion in a Motored IC Model Engine” Proc. I. Mech. Engrs 196 4
- Arcoumanis C. Bicen A.F. Whitelaw J.H. “Effect of Inlet Parameters on the Flow Characteristics in a Four-Stroke Model Engine” SAE Paper 820750 1982
- Johnston S.C. “Precombustion Fuel/Air Distribution in a Stratified Charge Engine using Laser Raman Spectroscopy” SAE Paper 790433 , 1979
- Durāo D.F.G. “The Application of Laser Anemometry to Free Jets and Flames with and without Recirculation” Ph.D. Thesis University of London 1976
- Dibble R.W. 1983
- Birch A.D. Brown D.R. Dobson M.G. Thomas J.R. “The Turbulent Concentration Field of a Methane Jet” J. Fluid Mech. 88 1978
- Lockwood F.C. Moneib H.A. “Fluctuating Temperature Measurements in a Heated Round Free Jet” Combustion Science and Technology 22 1980