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TECHNICAL PAPERS: Spark Ignition Engine Combustion

Knocking Cylinder Pressure Data Characteristics in a Spark-Ignition Engine

[+] Author and Article Information
M. Syrimis, D. N. Assanis

W. E. Lay Automotive Laboratory, University of Michigan, Ann Arbor, MI 48109-2121

J. Eng. Gas Turbines Power 125(2), 494-499 (Apr 29, 2003) (6 pages) doi:10.1115/1.1560709 History: Received July 01, 2000; Revised November 01, 2002; Online April 29, 2003
Copyright © 2003 by ASME
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References

Figures

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Pressure transducer signals at different locations of the combustion chamber. Center spark, front and rear transducers (top); rear spark, center and front transducers (bottom).
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Comparison of the energy spectra for a heavily knocking cycle recorded simultaneously by two pressure transducers at 100 kHz sampling frequency, 1000 rpm. (Top) front and rear transducers, center spark, 24° spark advance (trace knock +12°); (Bottom) front and center transducers, rear spark, 24° spark advance (trace knock +8°).
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Pressure traces from the front and rear transducers for cycle 1 (top) showing the knock initiation and propagation of the pressure waves in the chamber. Matching of the first peak in the two traces (bottom) shows that the initial fluctuations in each trace are caused by the same pressure wave. Center spark, 1000 rpm, 24° spark advance (trace knock +12°).
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Pressure traces from the front and rear transducers for cycle 3 (top) and cycle 5 (bottom). The increased amplitude of the initial pressure fluctuation in the second transducer-front transducer (top) and the rear transducer (bottom), indicates multiple sites of autoignition. Center spark, 1000 rpm, 24° spark advance (trace knock +12°).
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Pressure traces from the front (top) and center (bottom) transducer for two cycles. Rear spark, 1000 rpm, 24° spark advance (trace knock +8°).
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Engine configurations used; center spark-plug, front and rear pressure transducers (top) and rear spark-plug, front and center pressure transducers (bottom)
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Sampling frequency effects on recorded cylinder pressure for a heavy (top) and a light (bottom) knocking cycle. Rear spark, front transducer, 1000 rpm, 24° spark advance (trace knock +8°).

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