In an earlier publication [1] the authors compared numerical predictions of the mean cylinder pressure of diesel and dual-fuel combustion, to that of measured pressure data from a medium-speed, large-bore engine. In these earlier comparisons, measured data from a flush-mounted in-cylinder pressure transducer showed notable and repeatable pressure oscillations which were not evident in the mean cylinder pressure predictions from CFD. In this paper, the authors present a methodology for predicting and reporting the local cylinder pressure consistent with that of a measurement location. Such predictions for large-bore, medium-speed engine operation demonstrate pressure oscillations in accordance with those measured. The temporal occurrences of notable pressure oscillations were during the start of combustion and around the time of maximum cylinder pressure. With appropriate resolutions in time steps and mesh sizes, the local cell static pressure predicted for the transducer location showed oscillations in both diesel and dual-fuel combustion modes which agreed with those observed in the experimental data. Fast Fourier Transform (FFT) analysis on both experimental and calculated pressure traces revealed that the CFD predictions successfully captured both the amplitude and frequency range of the oscillations. Resolving propagating pressure waves with the smaller time steps and grid sizes necessary to achieve these results required a significant increase in computer resources.
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ASME 2017 Internal Combustion Engine Division Fall Technical Conference
October 15–18, 2017
Seattle, Washington, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-5832-5
PROCEEDINGS PAPER
Capturing Pressure Oscillations in Numerical Simulations of Internal Combustion Engines
Sreenivasa Rao Gubba,
Sreenivasa Rao Gubba
G.E. Global Research Center, Bangalore, India
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Ravichandra S. Jupudi,
Ravichandra S. Jupudi
G.E. Global Research Center, Bangalore, India
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Shyam Sundar Pasunurthi,
Shyam Sundar Pasunurthi
G.E. Global Research Center, Bangalore, India
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Sameera D. Wijeyakulasuriya,
Sameera D. Wijeyakulasuriya
Convergent Science, Inc, Madison, WI
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Roy J. Primus,
Roy J. Primus
G.E. Global Research Center, Niskayuna, NY
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Adam Klingbeil,
Adam Klingbeil
G.E. Global Research Center, Niskayuna, NY
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Charles E. A. Finney
Charles E. A. Finney
Oak Ridge National Laboratory, Oak Ridge, TN
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Sreenivasa Rao Gubba
G.E. Global Research Center, Bangalore, India
Ravichandra S. Jupudi
G.E. Global Research Center, Bangalore, India
Shyam Sundar Pasunurthi
G.E. Global Research Center, Bangalore, India
Sameera D. Wijeyakulasuriya
Convergent Science, Inc, Madison, WI
Roy J. Primus
G.E. Global Research Center, Niskayuna, NY
Adam Klingbeil
G.E. Global Research Center, Niskayuna, NY
Charles E. A. Finney
Oak Ridge National Laboratory, Oak Ridge, TN
Paper No:
ICEF2017-3527, V002T06A001; 8 pages
Published Online:
November 30, 2017
Citation
Gubba, SR, Jupudi, RS, Pasunurthi, SS, Wijeyakulasuriya, SD, Primus, RJ, Klingbeil, A, & Finney, CEA. "Capturing Pressure Oscillations in Numerical Simulations of Internal Combustion Engines." Proceedings of the ASME 2017 Internal Combustion Engine Division Fall Technical Conference. Volume 2: Emissions Control Systems; Instrumentation, Controls, and Hybrids; Numerical Simulation; Engine Design and Mechanical Development. Seattle, Washington, USA. October 15–18, 2017. V002T06A001. ASME. https://doi.org/10.1115/ICEF2017-3527
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