Partial Transparency of Advanced Compression Ignition Combustion Chamber Deposits, its Impact on Combustion Chamber Wall Temperatures and Application to Thermal Barrier Coating Design

Paper #:
  • 2017-24-0076

Published:
  • 2017-09-04
Abstract:
The proven impact of combustion chamber deposits on advanced compression ignition combustion strategies has steered recent works toward the development of thermal barrier coatings, which can mimic their benefits on combustion efficiency and operational range expansion. However, recent work based on statistical thermodynamics has indicated that inter-molecular radiation during the combustion event may subject the combustion chamber walls to non-negligible radiation heat transfer, regardless of the relatively low soot formation within the well-mixed and lean charge. In the present paper, the impact of radiation heat transfer on combustion chamber deposits and thermal barrier coatings is studied. The morphological construction of the combustion chamber deposit layer is shown to be partially transparent to radiation heat transfer, drawing corollaries with ceramic based thermal barrier coatings. The relative transparency of combustion chamber deposits and a magnesium zirconate thermal barrier coating is established and the impacts of this transparency on the time varying surface temperature trends are discussed. With only a portion of the total heat transfer attributed to radiation, the surface temperature swing of the thermal barrier is impacted, altering the projected impacts of the thermal barrier coating on advanced compression ignition operation and serving as an additional degree of freedom in thermal barrier coating design.
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