Diesel engine cylinder gas-side heat transfer to a ceramic surface

Thesis/Dissertation · Tue Dec 31 23:00:00 EST 1985

OSTI ID:6924443

Huang, J C

This dissertation contains two parts: (1) studies the effects of swirl and injection parameters on direct injection engine in-cylinder heat transfer; (2) investigates the effects of surface materials and extent of insulation on the heat transfer to the head of an open-chamber diesel. In (1), engine parameters varied were the injection pressure, nozzle geometry, and air swirl level. Two heat flux transducers were installed in a research head instrumentation plug to provide measurement of heat transfer rates to the head surface one over the bowl and other other over piston squish lip. The effect of increased injection pressure was found to increase the peak heat flux, to advance the timing of this peak and to generally increase the time-averaged heat flux. Increasing the swirl level decreases the heat flux level. Trends of the heat flux are mostly similar for the three different nozzle geometries tested. In (2), 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 were compared to data for an uninsulated metal late. Substantial reductions in peak values of surface heat flux were achieved with zirconia over the uninsulated metal.

• Research Organization: Wisconsin Univ., Madison (USA)
• OSTI ID: 6924443
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330102* -- Internal Combustion Engines-- Diesel
36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
CERAMICS
CHALCOGENIDES
COMPARATIVE EVALUATIONS
DIESEL ENGINES
ELEMENTS
ENERGY TRANSFER
ENGINES
HEAT ENGINES
HEAT TRANSFER
INTERNAL COMBUSTION ENGINES
METALS
OXIDES
OXYGEN COMPOUNDS
SURFACES
THERMAL INSULATION
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES