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Optimizing Gaseous Fuel-Air Mixing in Direct Injection Engines Using an RNG Based k-ε Model
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Abstract
Direct injection of natural gas under high pressure conditions has emerged as a promising option for improving engine fuel economy and emissions. However, since the gaseous injection technology is new, limited experience exists as to the optimum configuration of the injection system and associated combustion chamber design. The present study uses KIVA-3 based, multidimensional modeling to improve the understanding and assist the optimization of the gaseous injection process. Compared to standard k-ε models, a Renormalization Group Theory (RNG) based k-ε model [1] has been found to be in better agreement with experiments in predicting gaseous penetration histories for both free and confined jet configurations. Hence, this validated RNG model is adopted here to perform computations in realistic engine geometries. The parameters explored include the effects of piston crown shape, injector targeting, glow-plug presence, injection velocity, injection timing, number of injector holes, and initial swirl ratio on mixing. Insight generated from these studies provides guidelines on designing a combustion chamber and its associated fuel injection system for optimum gaseous fuel-air mixing.
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Papageorgakis, G. and Assanis, D., "Optimizing Gaseous Fuel-Air Mixing in Direct Injection Engines Using an RNG Based k-ε Model," SAE Technical Paper 980135, 1998, https://doi.org/10.4271/980135.Also In
References
- Han, Z. Reitz, R.D. “Turbulence Modeling of Internal Combustion Engines Using RNG k-ε Models,” Comb. Sci. & Tech. 106 267 295 1995
- Ouellete, P. Hill, P. G. “Visualization of Natural Gas Injection for a Compression Ignition Engine,” SAE Paper 921555 1992
- Doughty, G. E. Bell, S.R. Midkiff, K. C. “Natural Gas Fueling of a Caterpillar 3406 Diesel Engine,” J. Eng. Gas Turb. Power 114 459 465 1992
- Jennings, M. J. Jeske, F. R. Welch, A. B. “Modeling of the Natural Gas Injection Process in a Two-Stroke Diesel Engine,” SAE Paper 920192 1992
- Jennings, M. J. Jeske, F. R. “Analysis of the Injection Process in Direct Injected Natural Gas Engines: Part I-Study of Unconfined and In-Cylinder Plume Behavior” J. Eng. Gas Turb. Power 116 799 805 1994
- Jennings, M. J. Jeske, F. R. “Analysis of the Injection Process in Direct Injected Natural Gas Engines: Part II-Effects of Injector and Combustion Chamber Design,” J. Eng. Gas Turb. Power 116 806 813 1994
- Zhang, J. Fraser, R. A. Strong, A. B. “Modeling Diesel Engine Natural Gas Injection: Injector/Cylinder Boundary Conditions,” SAE Paper 940329 1994
- Papageorgakis, G.C. Agarwal, A. Zhang, G. Assanis, D.N. “Multi-Dimensional Modeling of Natural Gas Injection, Mixing and Glow-Plug Ignition Using the KIVA3 Code,” ASME-ICE Spring Technical Conference Proceedings 26-3 65 72 Youngstown, Ohio 1996
- Abraham, J. “What is Adequate Resolution in the Numerical Computations of Transient Jets?” SAE Paper 970051 1997
- Abraham, J. Magi, V. “Computations of Transient Jets: RNG k-ε Model Versus Standard k-ε Model” SAE Paper 970885 1997
- Papageorgakis, G.C. “Turbulence Modeling of Gaseous Injection and Mixing in DI Engines,” Ann Arbor, Michigan 1997
- Abraham, J. Magi, V. Macinnes, J. Bracco, F.V. “Gas Versus Spray Injection: Which Mixes Faster?” SAE Paper 940895 1994
- Amsden, A. A. “KIVA3: A KIVA Program with Block-Structured Mesh for Complex Geometries,” Los Alamos National Laboratory Report LA-12503-MS 1993
- Yakhot, V. Orszag, S.A. “Renormalization Group Analysis of Turbulence. I. Basic Theory,” J. Sci. Comput . 1 3 51 1986
- Yakhot, V. Orszag, S.A. Thangam, S. Gatski, T.B. Speziale, C.G. “Development of Turbulence Models for Shear Flows by a Double Expansion Technique,” Phys. Fluids A 4 1510 1520 1992
- Yakhot, V. Smith, L.M. “The Renormalization Group, the e-Expansion and Derivation of Turbulence Models,” J. Sci. Comput . 7 35 61 1992
- Aesoy, V. “Hot Surface Assisted Compression Ignition in a Direct Injection Natural Gas Engine,” Department of Marine Engineering, University of Trondheim-NTH 1996
- Fujimoto, H. Hyun, G.-S. Nogami, M. Hirakawa, K. Asai, T. Senda, J. 1997 “Characteristics of Free and Impinging Gas Jets by Means of Image Processing,” SAE Paper 970045 1997
- Song, S. Hill, P., G. “Dual-Fueling of a Prechamber Diesel Engine With Natural Gas,” J. Eng. Gas Turb. Power 107 914 921 1985
- Kroeger, C. A. “A Neat Methanol Direct Injection Combustion System for Heavy-Duty Applications,” SAE Paper 861169 1986