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Theoretical Consideration to Improve Engine Cooling and Application of Coupling 3D Combustion Simulations with Heat Transfer in Water Jacket and Components

Article of Honda R&D Technical Review Vol.15 No.2

Summary

Improving engine cycle thermal efficiency is an effective way to increase engine torque and to reduce fuel consumption simultaneously. However, the extent of the improvement is limited by engine knock, which is more evident at low engine speeds when combustion flame propagation is relatively slow. In this paper, computational fluid dynamics (CFD) tools were applied to evaluate the potential for improvement of V6 engine, and effectiveness of various design concepts of engine water jacket by judging surface heat transfer coefficient under isothermal condition. Theoretical considerations were given to optimize the cooling efficiency. Consequentially, engine performance was carried out in base engine and a prototype engine, improvement of engine output and fuel economy was confirmed. Furthermore, a new CFD methodology was developed in which iterative coupling approach was taken to include combustion chamber, water jacket and solid components. Component temperatures were predicted explicitly and compared with measurement results.

Reference

(1) Norris, P., Wepfer, W., Hoag, K., Courtine-White, D.: Experimental and Analytical Studies of Cylinder Head Cooling, SAE 931122
(2) Moeckel, M.: Computational Fluid Dynamic (CFD) Analysis of a Six Cylinder Diesel Engine Cooling System with Experimental Correlation, SAE 941081
(3) Shih, S., Itano, E., Kawamoto, M., Y. Maeda, Xin, J.: Engine Knock Toughness Improvement Through Water Jacket Optimization, SAE 2003-01-3259
(4) Amsden, A.: KIVA-3V, A Block-Structured KIVA Program for Engines with Vertical or Canted Valves, Los Alamos Report LA-13313-MS, July (1997)
(5) Reitz, R. D., Rutland, C. J.: Development and Testing of Diesel Engine CFD Models, Prog. Energy Combust. Sci. Vol. 21 (1995)
(6) Fan, L., Reitz, R. D.: 2000 Spray and Combustion Modeling in Gasoline Direct Injection Engines, ICLASS 2000 issue of Atomization and Spray
(7) Xin, J., Shih, S., Itano, E., Maeda, Y.: Integration of 3D Combustion Simulations and Conjugate Heat Transfer Analysis to Quantitatively Evaluate Component Temperatures, SAE 2003-01-3128
(8) Abraham, J., Bracco, F. V., Reitz, R.: Comparisons of Computed and Measured Premixed Charge Engine Combustion, Combustion and Flame, Vol. 60, pp. 309-322 (1985)
(9) Xin, J., Montgomery, D., Han, Z., Reitz, R.: Multidimensional Modeling of Combustion for a Six-Mode Emissions Test Cycle on a DI Diesel Engine, J. Engineering for Gas Turbines and Power, Vol. 119, pp. 683-691 (1997)
(10) Kuo, T., Reitz, R.: Three Dimensional Computations of Combustion in Premixed-Charge and Direct Injected Two-Stroke Engines, SAE 920425

Author (organization or company)

Jun XIN(Honda R&D Americas, Inc.)、Stephen SHIH(Honda R&D Americas, Inc.)、Edwin ITANO(Honda R&D Americas, Inc.)、Yoshio MAEDA(Honda R&D Co., Ltd.)、Michio KAWAMOTO(Honda R&D Co., Ltd.)、Yoshio YAMAMOTO(Honda R&D Americas, Inc.)

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