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Experimental Study on Axial Stratification Process and Its Effects (I) - Stratification in Engine -  

Ohm, In-Yong (Department, of Mechanical Engineering, Seoul National University of Technology)
Park, Chan-Jun (Department, of Mechanical Engineering, Seoul National University of Technology)
Publication Information
Journal of Mechanical Science and Technology / v.16, no.11, 2002 , pp. 1457-1469 More about this Journal
Abstract
This paper is the first of several companion papers, which investigate axial stratification process and its effects in an Sl engine. The axial stratification is very sophisticate phenomenon, which results from combination of fuel injection, port and in-cylinder flow and mixing. Because of the inherent unsteady condition in the reciprocating engine, it Is impossible to understand the mechanism through the analytical method. In this paper, the ports were characterized by swir and tumble number in steady flow bench test. After this, lean misfire limit of the engines, which had different port characteristic, were investigated as a function of swirl ratio and injection timing for confirming the existence of stratification. In addition, gas fuel was used for verifying whether this phenomenon depends on bulk air motion of cylinder or on evaporation of fuel. High-speed gas sampling and analysis was also performed to estimate stratification charging effect. The results show that the AFR at the spark plug and LML are very closely related and the AFR is the results of bulk air motion.
Keywords
Stratification; Steady Flow Bench; Swirl Ratio; Injection Timing; Lean Misfire Limit;
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  • Reference
1 Matsusita, S., 1985, 'Effects of Helical Port with Swirl Control Valve on the Combustion and Performance of SI Engine,' SAE Paper 850046
2 Nakanish, K., 1992, 'Development of a new intake system for a 4-valve lean burn engine,' SAE Paper 920520
3 Ohm, I.Y., Ahn, H.S., Lee, W.J., Kim, W.T., Park, S.S. and Lee, D.U., 1993, 'Development of HMC Axially Stratified Lean Combustion Engine,' SAE Paper 930879, SAE Transaction 103, Vol. 3, pp. 1298-1311
4 Ohm, I.Y., Jeong, K.S. and Jeung, I.S., 1997, 'Effects of Injection Timming on the Lean Misfire Limit in an SI Engine,' SAE Paper 970028, SAE Transactions 106, Vol. 3, pp. 42-55
5 Quader, A.A., 1982, 'The Axially-Stratified-Charge Engine,' SAE Paper 820131
6 Saito, F., 1994, 'Mazda Advanced Lean Burn Engine with New Three-Way Catalyst,' SAE Paper 940506
7 Cussion, G., LTD, 1993, Flow bench Super-Flow 600 Manual
8 Harada, J., 1992, 'Development of a New Gen-eration Lean Burn Engine,' SAE Paper 920468
9 Heywood J.B., 1988, Internal Combustion Engine Fundamentals, McGraw-Hill, Singapore, pp. 343-345
10 Horie, K., 1992, 'The Development of High Fuel Economy and High Performance Four-Valve Lean Burn Engine,' SAE Paper 920455
11 Kalghatgi G.T., 1987, 'Spark Ignition, Early Flame Development and Cyclic Variation in IC Engines,' SAE Paper 870163
12 Matsushita, S., 1985, 'Development of the Toyota Lean Combustion System,' SAE Paper 850044
13 Stone R., 1992, Introduction to Internal Combustion Engine, MACMILLAN, London, pp. 183-185
14 Stone, R., 1992, Introduction to Internal Combustion Engine, MACMILLAN, London, pp. 140-143
15 Takeda, K., 1985, 'Toyota Central Injection (CI) System for Lean Combustion and High Transient Response,' SAE Paper 851675
16 Watanabe, T., 1993, 'Optimization of In-Cylinder Flow and Mixing for the Center Spark Four Valve Lean Burn Engine Employing the Concept of Barrel-Stratification,' SAE Paper 930585