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A Phenomenological Unsteady Jet Model for Uniflow Scavenging
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English
Abstract
As a predictive model for the uniflow scavenging process, a phenomenological model has been suggested. Based on jet mixing and propagation, this model can give an approximate description of velocity and concentration fields, thus obviating the uncertainty of the thermodynamic models. The unsteady jet model is soundly founded on the conservation laws of mass, momentum and energy for compressible flow. A comparison between the computational and experimental results of an opposed-piston two-stroke engine demonstrates good agreement. The experimental work on a simple water rig has been done. It also validates that the unsteady jet model is satisfactory.
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Citation
Changyou, C. and Wallace, F., "A Phenomenological Unsteady Jet Model for Uniflow Scavenging," SAE Technical Paper 871658, 1987, https://doi.org/10.4271/871658.Also In
SAE 1987 Transactions: Reciprocating Engines--Spark Ignition and Diesel
Number: V96-4; Published: 1988-09-01
Number: V96-4; Published: 1988-09-01
References
- Rizk W. “Experimental Studies of the Mixing Process and Flow Configurations in Two-Cycle Engine Scavenging” Proc.Instn.Mech.Engrs 172 417 437 958
- Faler J.H. Leibovich S. “An Experimental Map of the Internal Structure of a Vortex Breakdown” J. Fluid Mech. 86 313 335 1978
- Libby P.A. “Studies in Variable-Density and Reacting Turbulent Shear Flows” Studies in Convection 2 Academic Press 1977
- Wallace F.J. Mitchell R.W.S. “Wave Action Following the Sudden Release of Air through an Engine Port System” Proc.Instn.Mech. Engrs, (B) 1B 8 1952-53
- Hall M.G. “Vortex Breakdown” Ann.Rev.Fluid Mech.4 195 219 1972
- Newhall H.K. Starkman E.S. “Thermodynamic Properties of Octane and Air for Engine Performance” SAE 633G 1963
- Woschni G. “A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine” SAE 670931 1967
- Ricou F.P. Spalding D.B. “Measurement of Entrainment by Axi-Symmetrical Turbulent Jets” J.Fluid Mech. 11 21 32 1961
- Scheltz J.A. “Injection and Mixing in Turbulent Flow” 68 Progress in Astronautics and Aeronautics, American Institution of Aeronautics and Astronautics
- Lilley D.G. “Prediction of Inert Turbulent Swirl Flows” AIAA J 11 7 1977
- Prandtl L. “Bemerkungen zur Theorie der freien Turbulenz” ZAMM 22 241 243 1942
- Tarabad M. “Diesel Engine Cycle Simulation” The University of Bath 1982
- Wallace F.J. Wright E.J. “Characteristics of a Two-Stroke Opposed-Piston Compression-Ignition Engine Operating at High Boost” Proc.Instn.Mech.Engrs 180 7 1965-66
- Wallace F.J. Cave P.R. “Experimental and Analytical Studies on a Two-Cycle Opposed-Piston Diesel Engine” SAE 710175 1971
- Perez J.M. Landen E.M. “Exhaust Emission Characteristics of Precombustion Chamber Engine” SAE 680421 1968