Evaluation of an Air-Gap-Insulated Piston in a Divided-Chamber Diesel Engine 850359
An air-gap-insulated piston designed for reduced heat loss was evaluated by examining its influence on the coolant heat rejection, engine performance and exhaust emissions of a single-cylinder divided-chamber diesel engine. At 1000 and 1500 r/min engine speed, use of the low-heat-rejection (LHR) piston resulted in a reduction in total coolant heat rejection ranging from 3% at light load to 5-7% at full load, in a general reduction in hydrocarbons, carbon monoxide and smoke emissions, in an increase in oxides of nitrogen, and in a significant improvement in brake specific fuel consumption only at light loads. It was estimated that the LHR piston design reduced the piston-crown surface heat transfer by an amount equivalent to from 3.5% (full load) to 5.5% (light load) of the input fuel energy at 1000 r/min.
Citation: Cole, R. and Alkidas, A., "Evaluation of an Air-Gap-Insulated Piston in a Divided-Chamber Diesel Engine," SAE Technical Paper 850359, 1985, https://doi.org/10.4271/850359. Download Citation
Author(s):
R. M. Cole, A. C. Alkidas
Affiliated:
Engine Research Dept. General Motors Research Laboratories
Pages: 12
Event:
SAE International Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Advances in Adiabatic Engines-SP-0610, SAE 1985 Transactions-V94-85
Related Topics:
Diesel / compression ignition engines
Nitrogen oxides
Exhaust emissions
Pistons
Fuel consumption
Heat transfer
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