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Three Dimensional Calculations of DI Diesel Engine Combustion and Comparison whit In Cylinder Sampling Valve Data
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Abstract
A modified version of KIVA II code was used to perform three-dimensional calculations of combustion in a DI diesel engine. Both an ignition delay submodel and a different formulation of the fuel reaction rate were implemented and tested.
The experiments were carried out on a single cylinder D.I. diesel of 0.75 I displacement equipped with sensors to detect injection characteristics and indicated pressure. A fast acting sampling valve was also installed in the combustion chamber to allow the measurement of main pollutants during the combustion cycle, by an ensemble average technique. Computational and experimental results are compared and the discrepancies are discussed.
Today the demand for light duty engines that produce less emission and consume less fuel is increasing. Thus, if limits on CO2 emissions are established, the direct injection diesel engine for light duty applications will become an attractive option. Also, manufacturers of heavy duty diesel engines are facing increasingly stringent emission standards. New research efforts aim at improving DI diesels emission behaviour.
Given the complexity of the interaction between the different processes in diesel combustion, comprehensive models of in-cylinder phenomena prove to be useful in providing guidelines for prototype development. Multidimensional analytical models of in cylinder phenomena have been greatly improved over the last decade, given the progress of the efficiency of computer hardware and diagnostic techniques. In particular many authors [1, 2, 3, 4, 5, 6 and 7] have numerically simulated the interaction between the airflow field and the spray and have compared it with experimental data. However, both three dimensional calculations of combustion in the presence of fuel sprays and the corresponding comparisons with experimental data are hardly found in literature. In most cases the comparison between numerical and experimental results is limited to the pressure history and to the fitting of some pollutant emissions late in the expansion stroke.
In particular, limiting the review to diesel combustion, Zellat and others [8] present calculations of a swirl chamber engine at different loads, injection timings, and speeds, obtained with a modified version of KIVA code. In their results, the computed in-cylinder pressure agrees well with the experimental one. Takeneka and others [9] used KIVA code to perform calculations of DI Diesel combustion for both swirl chamber and quiescent chamber systems. No details about the modifications introduced in the original code are provided.
Computational comparisons with in cylinder measurements, performed in a quiescent chamber system by Kamimoto [10], show discrepancies between computations and measurements. Gonzales and others [11] also used the KIVA II code with the Reitz atomization model and a single step Arrhenius mechanism to describe combustion of tetradecane in a D.I. quiescent chamber engine. The paper focuses on the spray submodel effect on the accuracy of pressure history prediction. It was demonstrated that, if adequate grid resolution is used, prediction of combustion is sensitive to the details of combustion and fuel injection models.
In the present paper a detailed comparison between experiments with a fast acting sampling valve and 3D calculations is presented for a medium duty swirl supported DI engine. Calculations are performed by KI-VA II code with the adoption of the TAB jet break up sub-model and wall impingement modelling. In addition, a different formulation of combustion model is discussed. The current status of the “numerical engine program” in progress at Istituto Motori of CNR, is thus defined.
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Citation
Belardini, P., Bertoli, C., Ciajolo, A., D'Anna, A. et al., "Three Dimensional Calculations of DI Diesel Engine Combustion and Comparison whit In Cylinder Sampling Valve Data," SAE Technical Paper 922225, 1992, https://doi.org/10.4271/922225.Also In
References
- Andrews M.J. Bracco F.V. “The use of intake and exhaust measurements with computer simulation to investigate the evolution of internal flow field in a ported engine” SAE 910262
- Power G. “Physical mechanism for atomization of a jet spray: a comparison of models and experiments” SAE 881318
- Zurloye A.O. et. al. “Cycle resolved LDV measurements in a motored diesel engine and comparison with k, e model prediction” SAE 890618
- Amsden A. O'Rlourke P.J. Butler T.D. “Comparisons of computed and measured three-dimensional velocity fields in a motored two strokes engine” SAE 920418
- Belardini P. Bertoli C. Corcion F.E. Valentino G. “In cylinder flow measurements by L.D.A. and numerical simulations by KIVA code” SAE 920156
- Amato U. Belardini P. Bertoli C. Del Giacomo N. “The joint use of multidimensional modelling and field experiments in order to design diesel combustion systems” I.Mech.E. 57 62 London 1991
- Allocca L. Belardini P. Bertoli C. Corcione F.E. DeAngelis F. “Experimental and numerical analysis of diesel sprays” SAE 920576
- Zellat M. Rolland Th. Poplow F. “Three-dimensional modelling of combustion and soot formation in an Indirect Injection Diesel Engine” SAE 900254
- Takenaka Y. “3D numerical simulation of fuel injection and combustion phenomena in D.I. Diesel engines” SAE 890668
- Aoiagi Y. Kamimoto T. Mastui Y Mastuoka S. “A gas sampling study on the formation processes of soot and NO in a D.I. Diesel engine” SAE 800254
- Gonzales M.A. Lian Z.W Reitz R. “Modelling diesel engine spray vaporization and combustion” SAE 920579
- Amsden A. O'Rourke P.J. Butler T.D. “KIVA2: a computer program for chemically reactive flows with sprays” 1989
- Reitz R. “Modelling atomization processes in high pressure vaporizing sprays” Atomization and Spray Technology 3 1987 309 337
- Integrated Diesel European Action: Diesel Combustion IDEA Fisita '90 Seminars may 1990
- Hardenberg H.O. Hase F.W. “An empiric formula for computing the pressure rise delay of a fuel from its cetane number and from relevant parameters of D.I. diesel engines” SAE 790493
- Magnussen B.I. Hjertager B.H. “On mathematical modelling of turbulent combustor with special enphasis on soot formation and combustion” 16th International Symposium on Combustion 1976
- Hiroyasu H. “Diesel engine combustion and its modelling” COMODIA Tokyo 1985
- Kono S. Nagao A. Motooka H. “Prediction of in cylinder flow and spray FORMATION Effects on combustion in D.I. Diesel engines” SAE 850108
- Barbella R. Bertoli C. Ciajolo A. D'Anna A. “Pyrolysis and oxidation of n tetradecane during combustion in a Diesel engine” 23th Symposium on Combustion 1079 1085 1990
- Barbella R. Bertoli C. Ciajolo A. D'Anna A. “In cylinder sampling of high molecular weight hydrocarbons from a D.I. light duty Diesel engine” SAE 890437
- Barbella R. Bertoli C. Ciajolo A. D'Anna A. “Behaviour of a fuel oil during the combustion cycle of a D.I. Diesel engine” Combustion and Flame 1982 191 198 1990
- O'Rourke P.J. Amsden A. “The TAB method for numerical calculation of spray droplet break up” SAE 872089
- Nishida K. Hiroyasu H. “Simplified three-dimensional modelling of mixture formation and combustion in a D.I. Diesel engine” SAE 890269
- Leung K. Lindsted R.P. Jones W.P. “A simplified reaction mechanism for soot formation in nonpremixed flames” Combustion and Flames 87 289 305 1991