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Optimising CFD Predictions of Diesel Engine Combustion and Emissions Using Design of Experiments: Comparison With Engine Measurements
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Abstract
Design of experiments (DoE) has been used to optimise the accuracy of CFD predictions for diesel combustion and emissions simulations. Eight CFD simulation variables concerning grid geometry and simulation time step were used as the basis for a twenty-two point DoE analysis. The results showed that for practical CFD simulations the CFD predictions were heavily dependent on local grid distribution and the calculation timestep. From the DoE statistical models, two CFD setups were predicted to give optimal combustion and emissions results with CPU times of 11 and 44 hours, model (A) and model(B), respectively. These two CFD model setups were then used to assess the accuracy of CFD combustion and emissions predictions against a series of detailed measurements performed on a single cylinder engine fitted with a common rail fuel injection system.
Comparisons with the measured data for twenty-one engine test configurations showed that model (B) delivered more consistent and more accurate predictions of in-cylinder pressure, engine power, fuel consumption, NOx and soot. Predictions of mean in-cylinder pressure were within 4% of the measured values, predicted engine power and fuel consumption were within 6%. The best predictions were within 1%. With CFD model setup (B), NOx was predicted within 10-1 5% for all, but three, of the twenty-one engine test points. Realistic NOx and soot trends were also obtained from model (B).
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O'Connor, J., White, C., and Charnley, M., "Optimising CFD Predictions of Diesel Engine Combustion and Emissions Using Design of Experiments: Comparison With Engine Measurements," SAE Technical Paper 982458, 1998, https://doi.org/10.4271/982458.Also In
References
- Mather, D. K. Reitz, R. D. “Modeling the Influence of Fuel injection Parameters on Diesel Engine Emissions” SAE Paper 980789 1998
- Han, Z. Uludogan, A. Hampson, G.J. Reitz, R.D. “Mechanism of Soot and NOx Emission Reduction Using Multiple Injection in a Diesel Engine” SAE Paper 960633 1996
- Beatrice, C. Belardini, P. Bertoli, C. Cameretti, C. Del Giacomo, N. “An Assessment of Predictivity of CFD Computations of Combustion and Pollutants Formation in DI Diesel Engines” SAE Paper 962055 1996
- Pitsch, H. Barths, H. Peters, N. “Three dimensional Modeling of NOx and Soot Formation in Dl Diesel Engines Using Detailed Chemistry Based on the interactive Flame/et Approach” SAE Paper 962057 1996
- Launder, B.E. Spalding, D.B. Comp. Meth.Appl. Mech. Engineer 3 269 289 1974
- Dukowicz, J.K. “A Particle-fluid Numerical Model for Liquid Sprays” J. Comp. Physics 35 229 253 1978
- Gosman, A.D. Johns, R.J.R. “Computer Analysis of Fuel-Air Mixing in Direct Injection Engines” SAE Paper 800091 1980
- Huh, K.Y. Gosman, A.D. “A Phenomenological Model of Diesel Spray Atomisation” Proc. Int. Conference on Multiphase Flows 1991
- Halstead, M.P. Kirsch, L.J. Quinn, C.P. The Autoignition of Hydrocarbon Fuels at High Temperatures and Pressure: Fitting of a Mathematical Model” Combust. Flame 30 45 60 1977
- Schaperton, H. Lee, W. “Multidimensional Modelling of Knocking Combustion in SI Engines” SAE Paper 850502 1985
- Magnussen, B.F. Hjertager, B.H. Sixteenth Symposium (International) on Combustion The Combustion Institute Pittsburgh 1978 719 730
- Issa, R.I. Gosman, A.D. Watkins, A.P. “The Computation of Compressible and Incompressible Recirculating Flows by a Non-iterative implicit Scheme” J. Comp. Phys. 62 1 66 82 l986
- Tabrizi, B.S. “Three Dimensional Diesel Spray Predictions in Combustion Chamber Flows” University of London 1991
- Ikonomou, E. “Three Dimensional Spray and Combustion Calculations for Diesel Engines” University of London 1996
- Zeldovich, Y.B. Sandovnikov, P.Y. Frand-Kamenetski, D.A. Academy of Sciences of USSR Inst. Chem. Phys. Moscow-Leningrad 1947
- Heywood, J.B. “Internal Combustion Engine Fundamentals” McGraw-Hill NY 572 577 1988
- Hiroyasu, H. Nishida, K. “Simplified three dimensional modelling of mixture formation and combustion in a DI Diesel Engine” SAE Paper 890269 1989
- Nagle, J. Strickland-Constable, R.F. “Oxidation of Carbon Between 1000-2000C” Proc. of Fifth Carbon Conf Pergamon Press London 1962
- Patterson, M.A. Kong, S.C. Hampson, G. J. Reitz, R.D. “Modelling the Effects of Fuel Injection Characteristics on Diesel Engine Soot and NOx Emissions” SAE Paper 940523 1994
- Pilley, A.D. Beaumont, A.J. Robinson, D. Mowll, D. “Design of Experiments for Optimization of Engines to Meet Future Emissions Targets” International Symposium on Advanced Transportation Applications 1994
- Edwards, S.P. Pilley, A.D. Michon, S. Fournier, G. “The Optimisation of Common Rail FIE Equipped Engines Through the Use of Statistical Experimental Design, Mathematical Modelling and Genetic Algorithms” SAE Paper 970346 1997
- Box Draper “Empirical Model Building and Response Surfaces” Wiley 1987
- Greeves, G Wang, C.H.T. “Origins of Diesel Particulate Mass Emission” SAE Paper 810260 1981