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An Investigation of Fluid Flow During Induction Stroke of a Water Analog Model of an IC Engine Employing LIPA
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Abstract
This paper presents results from experiments performed in an axisymmetric water analog model of a four-stroke IC engine using the optical velocimetry technique LIPA (Laser Induced Photochemical Anemometry). The investigation can be described as a fundamental scientific inquiry into the fluid dynamics encountered during engine operation, with the long term goal of increasing performance. An application of LIPA to a fluid dynamics problem delivers two-dimensional fields of velocity vectors which are projections of the full three-dimensional vectors in single measurement steps. From an evaluation of a velocity field vorticity information can be obtained readily. Velocity fields and vorticity distributions are, in this study, the basis for the evaluation of seven parametric quantities. Some of these may become tools that give engineers ‘rule of thumb’ indications of the mixing that is occurring. Fields of velocity vectors and vorticity distributions, along with the seven parametric quantities serve to characterize the fluid dynamics inherent in the flow fields.
The flow field during the intake stroke of the four-stroke model was investigated by varying two engine parameters, engine speed and valve lift (the valve lifts chosen were fixed during the intake stroke). The range of engine speeds investigated are below or near low idling conditions. Clear tendencies could be observed for the kinetic, fluctuation, and vortical energies contained in fluid flow in an area that is governed by a recirculation pattern that scales with engine volume. These energies increase with increasing engine speed and decreasing valve lift. For that same region it was found furthermore that the length scales of the existing flow structures are -- for the range of length scales studied -- independent of the setting of the engine parameters, and that the rotational strength in connection with these scales increases with increasing engine speed and decreasing valve lift. Another result outlined in this paper is an assertion of the significance of the fluid dynamics of azimuthal vortex rings, that are created in the shear layer of the annulus jet, with respect to the physics of fluid flow in an engine.
Citation
Stier, B. and Falco, R., "An Investigation of Fluid Flow During Induction Stroke of a Water Analog Model of an IC Engine Employing LIPA," SAE Technical Paper 950726, 1995, https://doi.org/10.4271/950726.Also In
References
- Arcoumanis, C. Bicen, A.F. Vlachos, N.S. Whitelaw, L.H. “Effects of flow and geometry boundary conditions on fluid motion in a motored IC model engine,” Proc. Instn Mech. Engrs, 196 1 10 1982
- Arcoumanis, C. Bicen, A.F. Whitelaw, J.H. “Measurements in a motored four-stroke reciprocating model engine,” J. Fluids Engng 104 235 241 1982
- Bicen, A.F. Vafidis, C. Whitelaw, L.H. “Steady and unsteady airflow through the intake valve of a reciprocating engine,” J. Fluids Engng 107 413 420 1985
- Vafidis, C. Whitelaw, J.H. “Intake valve and in-cylinder flow development in a reciprocating model engine,” Proc. Instn Mech. Engrs. 200 143 152 1986
- Arcoumanis, C. Whitelaw, L.H. “Fluid mechanics of internal combustion engines -- a review,” Proc. Instn Mech. Engrs 201 57 74 1987
- Ekchian, A. Hoult, D.P. “Flow visualization study of the intake process of an internal combustion engine,” SAE Paper No. 790095 1979
- Arcoumanis, C. Green, H.G. Wong, K.Y. “Flow structure visualisation in reciprocating engines,” Flow Visualization IV , Proceedings of the Fourth (International) Symposium on Flow Visualization Paris, France August 26-29 1986 705 711 Hemisphere Publ. Co. Washington, D.C. 1987
- Regan, C.A. Chun, K.S. Schock, H.J. “Engine flow visualization using a copper vapor laser,” Proc. of SPIE 737 17 27 Los Angeles 1987
- Eaton, A.R. Reynolds, W.C. “Flow structure and mixing in a motored axisymmetric engine,” SAE Paper No. 890321 1989
- Stier, B. Falco, R.E. “New developments in LIPA (Laser Induced Photochemical Anemometry),” Proc. of SPIE San Diego July 1993
- Stier, B. Falco, R.E. “Application of LIPA (Laser Induced Photochemical Anemometry) to the water analog model of a four-stroke IC engine” SAE, Paper No. 940282 1994
- Stier, B. “An investigation of fluid flow during induction stroke of a water analog model of an IC engine using an innovative optical velocimetry concept -- LIPA,” Ph.D. Dissertation Department of Mechanical Engineering, Michigan State University 1994
- Falco, R.E. Nocera, D.G. “Quantitative multipoint measurements and visualization of dense liquid-solid flows using Laser Induced Photochemical Anemometry (LIPA),” Particulate two-phase flow Roco M.C. Butterworth-Heinemann 1912
- Shack, D.H. Reynolds, W.C. “Application of particle tracking velocimetry to the cyclic variability of the pre-combustion flow field in a motored axisymmetric engine,” SAE Paper No. 910475 1991
- Moriyoshi, Y. Kamimoto, T. Ohtani, H. Yagita, M. “Stratification of swirl intensity in the axial direction for control of turbulence generation during the compression stroke,” SAE Paper No. 910261 1991
- Aita, S. Tabbal, A. Munck, G. Montmayeur, N. Takenaka, Y. Aoyagi, Y. Obana, S. “Numerical simulation of swirling port-valve-cylinder flow, in Diesel engines,” SAE Paper No. 910263 1991
- Henriot, S. Le Coz, J.F. Pinchon, P. “Three dimensional modelling of flow and turbulence in a four-valve spark ingnition engine - comparison with LDV measurements,” SAE Paper No. 890843 1989
- Kent, J.C. Mikulec, A. Rimai, L. Adamiczyk, A.A. Mueller, S.R. Stein, R.A. Warren, C.C. “Observations on the effects of intake-generated swirl and tumble on combustion duration,” SAE Paper No. 892096 1989
- Omori, S. Iwachido, K. Motomochi, M. Hirako, O. “Effect of intake port flow pattern on the in-cylinder tumbling air flow in multi-valve SI engines,” SAE Paper No. 910477 1991
- Hadded, O. Denbratt, I. “Turbulence characteristics of tumbling air motion in four-valve SI engines and their correlation with combustion parameters,” SAE Paper No. 910478 1991
- Witze, P.O. Martin, L.K. Borgnakke, C. “Conditionally-sampled velocity and turbulence measurements in a spark ignition engine,” Combustion Science and Technology 36 301 317 1984
- Liou, T.-M. Santavicca, D.A. “Cylce resolved LDV measurements in a motored IC engine,” J. Fluids Engng 107 232 240 1985
- Catania, A.E. Mittica, A. “Extraction techniques and analysis of turbulence quantities from in-cylinder velocity data,” Basic Processes in Internal Combustion Engines, ASME, Proceedings of the Twelfth Annual Energy-Sources Technology Conference Houston, Texas 6 1989
- Hilton, A.D.M. Roberts, J.B. Hadded, O. “Autocorrelation based analysis of ensemble averaged LDA engine data for bias-free turbulence estimates: a unified approach,” SAE Paper No. 910479 1991
- Falco, R.E. Chu, C.C. “Measurements of two-dimensional fluid dynamic quantities using a photochromic grid tracing technique,” Proc. of SPIE 814 706 710 San Diego 1987
- Falco, R.E. Gendrich, C.P. Chu, C.C. “Vorticity field measurements using Laser Induced Photochemical Anemometry (LIPA),” Seventh Symposium on Turbulent Shear Flow Stanford University August 21-23 1989
- Hilbert, H.S. Falco, R.E. “Measurements of flows during scavenging in a two-stroke engine,” SAE Paper No. 910671 1991
- Buchner, S. Flow field and mixture separation measurements in a dense solid-liquid two-phase vertical pipe flow Michigan State University 1992
- Yule, A.J. “Large-scale structure in the mixing layer of a round jet,” J. Fluid Mech 89 413 432 1978