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This content will become publicly available on April 9, 2019

Title: Capturing Pressure Oscillations in Numerical Simulations of Internal Combustion Engines

In an earlier publication, 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 computational fluid dynamics (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. Furthermore, resolving propagating pressure waves with the smaller time steps and grid sizesmore » necessary to achieve these results required a significant increase in computer resources.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [4] ; ORCiD logo [5]
  1. G.E. Global Research Center, Bangalore (India)
  2. G.E. Global Research Center, Bangalore (India); Simerics India, Bangalore (India)
  3. Convergent Science, Inc., Madison, WI (United States)
  4. G.E. Global Research Center, Niskayuna, NY (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Energy Resources Technology
Additional Journal Information:
Journal Volume: 140; Journal Issue: 8; Journal ID: ISSN 0195-0738
Publisher:
ASME
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; Oscillations; Pressure; Combustion; Fuels; Engines; Pressure transducers; Computational fluid dynamics; Diesel; Cylinders; Computer simulation
OSTI Identifier:
1439148