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C S Daw1, C E A Finney2, B C Kaul2

  • 1Fuels, Engines, and Emissions Research Center, Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA dawcs@ornl.gov.

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High exhaust gas recirculation (EGR) in engines causes combustion instabilities. Symbolic analysis revealed four-cylinder engines can lock in phase, alternating between two states, impacting efficiency and emissions.

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Area of Science:

  • Internal combustion engine research
  • Thermodynamics and combustion science
  • Automotive engineering

Background:

  • Advanced internal combustion engines use high exhaust gas recirculation (EGR) to improve efficiency and reduce emissions.
  • High EGR levels can cause significant combustion oscillations and control challenges.
  • Combustion instabilities may propagate between cylinders via residual exhaust gases.

Purpose of the Study:

  • To characterize multi-cylinder combustion oscillations in an experimental engine with external EGR.
  • To investigate the impact of increasing EGR levels on combustion stability.
  • To explore symbolic analysis as a diagnostic tool for combustion instabilities.

Main Methods:

  • Utilized symbolic analysis to study combustion oscillations in a four-cylinder experimental engine.
  • Operated the engine with varying levels of external exhaust gas recirculation (EGR).
  • Analyzed combustion data to identify patterns and coupling between cylinders.

Main Results:

  • At low EGR, intra-cylinder oscillations and intermittent cylinder coupling were observed.
  • At higher EGR, all four cylinders synchronized and alternated between two distinct bi-stable combustion states.
  • Symbolic analysis effectively characterized these multi-cylinder combustion instabilities.

Conclusions:

  • High EGR levels induce complex combustion instabilities in multi-cylinder engines.
  • Cylinder phase-locking and bi-stable combustion states are significant phenomena at elevated EGR.
  • Symbolic analysis offers a valuable method for diagnosing and understanding engine combustion instabilities.