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An Analysis of Ignition Delay, Heat Transfer and Combustion During Dynamic Load Changes in a Diesel Engine
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Abstract
In this paper we report the results of experiments done during the transient operation of a single cylinder Cummins NH engine. The data taken include cycle resolved pressure, combustion chamber surface temperatures and ignition delay. The data was taken during a special type of engine operation in which the engine was repeatedly hopped from one load to another. In this way cycle to cycle variations could be averaged out by ensemble averaging individual cycles after the step load change. For analysis of the heat transfer a unique finite difference temperature probe was developed to delineate the 3-D heat transfer effects in place of the standard 1-D assumptions and a new analysis technique was developed to calculate the instantaneous heat flux during the transient.
Analysis of the data indicates that the combustion reaches an equivalent steady state condition within 2000 engine cycles after the load change. The exhaust port temperatures, and therefore the exhaust enthalpy of course take much longer to reach their respective steady state values. The heat release rate and peak rate of pressure rise quickly jump (within 4 cycles) to values close to the steady state values and reach their steady state value within 2000 cycles. For cycle simulations we show that the thermal response of the engine can be accurately modelled as an exponential response with two, a long and short, time constants.
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Lin, C. and Foster, D., "An Analysis of Ignition Delay, Heat Transfer and Combustion During Dynamic Load Changes in a Diesel Engine," SAE Technical Paper 892054, 1989, https://doi.org/10.4271/892054.Also In
References
- Watanabe, Y. Fujisaki, H. Tsuda, T. “DI Diesel Engine Becomes Noisier at Acceleration - The Transient Noise Characteristic of Diesel Engine” SAE Paper 790269 1979
- Sawa, N. “Transitional Character of Diesel Engines” Nai Nan Ki Kan (Internal Combustion Engine, Japan) 57 19 235 1980 4 1980
- Samria, W. K. Kostin, A. K. Larionov, V. V. Kvasov, E. E. “Study of Heat Release Rate in Diesel Engine Cylinder Under Unsteady Regimes” 8 NCICEC-83, paper HT-1 1983
- Annand, W. J. D. Ma, T. H. “Instantaneous Heat Transfer Rates to the Cylinder Head Surface of a Small Compression-Ignition Engine” Proc. Inst. Mech. Engrs. 185 976 987 1971
- Whitehouse, N. D. “Heat Transfer in a Quiescent Chamber Diesel Engine” Proc. Inst. Mech. Engr. 185 963 975 1971
- Sihling, K. Woschni, G. “Experimental Investigation of the Instantaneous Heat Transfer in the Cylinder of a High Speed Diesel Engine” SAE Paper 790833 1979
- Huang, J. C. “Diesel Engine Cylinder Gas-Side Heat Transfer to a Ceramic Surface” Ph.D. Thesis University of Wisconsin-Madison 1986
- CRC Hand Book of Tables for Applied Engineering Science 74 CRC Press, Inc. 1980
- Huehn, W. Berendes, H. Sauerteig, J. E. “Charge Air Cooling- for Deutz Diesel Engines - System Arrangements and Effect on Performance and Emissions” SAE Paper 861943
- Lin, C.S. “Experimental Study of Combustion and Heat Transfer of a Diesel Engine Under Dynamic Operating Conditions,” Ph.D. Thesis Mechanical Engineering Department, University of Wisconsin - Madison 1988
- Van Gerpen, J. “The Effects of Air Swirl and Fuel Injection System Parameters on Diesel Combustion” Ph.D. Thesis Mechanical Engineering Department, University of Wisconsin-Madison 1984
- Krieger R.B. Borman, G.L. “The Computation of Apparent Heat Release for Internal Combustion Engines,” ASME, 66-WA/DGP-4
- Murayama, T. Miyamoto, N. Tsuda, T. Suzuki, M. Hasegawa, S. I. “Combustion Behaviors Under Accelerating Operation of An IDI Diesel Engine” SAE Paper 800966 1980
- Overbye, V. Bennethum, J. Uyehara, O. Myers, P. “Unsteady Heat Transfer in Engines,” SAE Transactions 9 461 494 1961
- Morel, T. Keribar, R. Blumberg, P. “Cyclical Thermal Phenomena in Engine Combustion Chamber Surfaces,” SAE 850360