Measurements of instantaneous heat flux to metal and ceramic surfaces in a diesel engine
The effects of surface materials and extent of insulation on the heat transfer to the head of an open-chamber diesel were studied. A large instrumentation plug designed to incorporate plates of various materials on the gas-side surface was utilized with a special research head. Instantaneous rates of heat transfer to the plate gas-side surface were measured. Measurement results obtained with a zirconia plate and an insulated metal plate are compared to data for an inunsulated metal plate. The insulation of the metal plate increased its gas-side surface temperature over the uninsulated case by about the same amount achieved with a 6.35-mm-thick zirconia plate. The magnitude of the surface temperature swing for zirconia is not as high as expected from conduction theory, but is substantially higher than that for the uninsulated metal. Significant reductions of steady-state heat fluxes were achieved with both the zirconia and the insulated metal compared to the uninsulated metal.
- Research Organization:
- Wisconsin Univ., Madison (USA)
- OSTI ID:
- 6420765
- Report Number(s):
- AD-A-179826/3/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330102* -- Internal Combustion Engines-- Diesel
36 MATERIALS SCIENCE
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
CERAMICS
CHALCOGENIDES
DIESEL ENGINES
ELEMENTS
ENERGY TRANSFER
ENGINES
FILMS
HEAT ENGINES
HEAT FLUX
HEAT TRANSFER
INTERNAL COMBUSTION ENGINES
MATERIALS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
OXIDES
OXYGEN COMPOUNDS
SURFACES
THERMAL INSULATION
THERMOCOUPLES
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES