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Reduction of HCCI Combustion Noise Through Piston Crown Design
Technical Paper
2010-01-1487
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Seven shapes of piston crowns have been evaluated for their ability to reduce HCCI knock and transmission of combustion noise to the engine. The performance of each piston crown was evaluated with measurements of cylinder pressure, engine vibration and acoustic sound pressure measured one meter away from the engine. The experiments were conducted in a diesel engine that was run in HCCI combustion mode with a fixed quantity of DME as fuel.
The results show that combustion knock is effectively suppressed by limiting the size of the volume in which the combustion occurs. Splitting the compression volume into four smaller volumes placed between the perimeter of the piston and the cylinder liner increased the noise to a higher level than that generated with a flat piston crown. This was due to resonance between the four volumes. Using eight volumes instead decreased the noise. The noise was further reduced with another piston crown where eight cylindrical volumes were drilled into the piston crown, so that the cylinder liner was not exposed directly to the combustion. A configuration with seven hemispherical volumes was less silent in operation, but still better than the flat piston crown. The largest and most consistent reduction in noise level was however achieved with a diesel bowl type piston.
The increased surface area as well as the larger crevice volumes of the experimental piston crowns generally resulted in lower IMEP than the flat piston. While the crevice volumes can be reduced, increased heat transfer can not be avoided. Thus, the use of alternative piston crown geometries designed to split the combustion may not be viable means of avoiding HCCI engine knock. The traditional diesel bowl type piston is therefore possibly the best alternative to the flat piston in terms of noise reduction as well as heat losses.
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Citation
Pedersen, T. and Schramm, J., "Reduction of HCCI Combustion Noise Through Piston Crown Design," SAE Technical Paper 2010-01-1487, 2010, https://doi.org/10.4271/2010-01-1487.Also In
References
- Bradley, D. Morley, C. Gu, X.J. Emerson, D.R. “Amplified Pressure Waves During Autoignition: Relevance to CAI Engines,” SAE Technical Paper 2002-01-2868 2002
- Gequn, S. Jingsi, W. Haiqiao, W. Xinwei, C. “Research on Couple Mechanism of Heat Release and Acoustic Characteristics during Combustion of Butane in Close Chamber,” SAE Technical Paper 2007-01-2175 2007
- Stiebels, B. Schreiber, M. Sakak, A.S. “Development of a New Measurement Technique for the Investigation of End-Gas Autoignition and Engine Knock,” SAE Technical Paper 960827 1996
- Pan, J. Sheppard, C.G.W. “A Theoretical and Experimental Study of the Modes of End Gas Autoignition Leading to Knock in S.I. Engines,” SAE Technical Paper 942060 1994
- Tsurushima, T. Kunishima, E. Asaumi, Y. Aoyagi, Y. et al. “The Effect of Knock on Heat Loss in Homogeneous Charge Compression Ignition Engines,” SAE Technical Paper 2002-01-0108 2002
- Scholl, D. Davis, C. Russ, S. Barash, T. “The Volume Acoustic Modes of Spark-Ignited Internal Combustion Chambers,” SAE Technical Paper 980893 1998
- Eng, J.A. “Characterization of Pressure Waves in HCCI Combustion,” SAE Technical Paper 2002-01-2859 2002
- Vressner, A. Lundin, A. Christensen, M. Tunestål, P. et al. “Pressure Oscillations During Rapid HCCI Combustion,” SAE Technical Paper 2003-01-3217 2003
- Broatch, A. Margot, X. Gil, A. Donayre, J.C. “A CFD Approach to Diesel Engine Combustion Chamber Resonance,” SAE Technical Paper 2007-24-0043 2007
- Andreae, M.M. Cheng, W.K. Kenney, T. Yang, J. “On HCCI Engine Knock,” SAE Technical Paper 2007-01-1858 2007
- Massey, J.A. Drallmeier, J.A. Eaton, S.J. Wagner, R.M. “Influence of the Combustion Energy Release on Surface Accelerations of an HCCI Engine,” SAE Technical Paper 2009-01-2741 2009
- Blunsdon, C.A. Dent, J.C. “The Simulation of Autoignition and Knock in a Spark Ignition Engine with Disk Geometry,” SAE Technical Paper 940524 1994