Diesel cylinder gas-side heat flux to a ceramic surface. Final report, 18 May 1981-30 June 1985
Results of four research projects, each dealing with instantaneous heat flux to the cylinder head of reciprocating engine, are given. The projects are: heat flux measurements in a diesel engine with variations in injection pressure, nozzle tips, and swirl; development of instrumentation for radiation measurements in a diesel cylinder; heat-flux measurements to various surfaces on the head of diesel engines including a normaly cooled metal surface, an insulated metal surface and a zirconia surface; and initial attempts to simultaneously measure the fluid motion and heat flux in a motored engine boundary layer. The variation of injection-pressure nozzle tips and swirl in a direct-injection diesel showed strong coupling between combustion and heat flux. An instrument for radiation measurement that uses a wall jet to reduce convection is described. Compression of the jet by the combustion heat release prevents zeroing of the convection. The major portion of the research was devoted to heat-flux measurements to the surface of an instrumentation plug in the head of a single TACOM-LABECO diesel. Comparisons made between data for insulated and uninsulated surfaces show that the hot metal surface gave reduced time-averaged heat transfer, but gave a higher peak heat flux than a normally cooled surface. Data for zirconia plate surface gave reduced time-averaged heat transfer, but gave a higher peak heat flux than a normally cooled surface. Data for zirconia-plate surface showed a reduction in peak flux that was larger than predicted from the rise in surface temperature alone.
- Research Organization:
- Wisconsin Univ., Madison (USA). Engine Combustion Lab.
- OSTI ID:
- 5165845
- Report Number(s):
- AD-A-168948/8/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330102* -- Internal Combustion Engines-- Diesel
CERAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
CONVECTION
COOLING
DIESEL ENGINES
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY TRANSFER
ENGINES
FLUIDS
HEAT ENGINES
HEAT FLUX
HEAT TRANSFER
HIGH TEMPERATURE
INJECTION
INTAKE
INTERNAL COMBUSTION ENGINES
MASS TRANSFER
METALS
MOTION
OXIDATION
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SURFACES
THERMAL RADIATION
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES