Capturing pressure oscillations in numerical simulations of internal combustion engines

Sreenivasa Rao Gubba, Ravichandra S. Jupudi, Shyam Sundar Pasunurthi, Sameera D. Wijeyakulasuriya, Roy J. Primus, Adam Klingbeil, Charles E.A. Finney

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Scopus citations

Abstract

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 mediumspeed, 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.

Original languageEnglish
Title of host publicationEmissions Control Systems; Instrumentation, Controls, and Hybrids; Numerical Simulation; Engine Design and Mechanical Development
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791858325
DOIs
StatePublished - 2017
EventASME 2017 Internal Combustion Engine Division Fall Technical Conference, ICEF 2017 - Seattle, United States
Duration: Oct 15 2017Oct 18 2017

Publication series

NameASME 2017 Internal Combustion Engine Division Fall Technical Conference, ICEF 2017
Volume2

Conference

ConferenceASME 2017 Internal Combustion Engine Division Fall Technical Conference, ICEF 2017
Country/TerritoryUnited States
CitySeattle
Period10/15/1710/18/17

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