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Heat Insulation of Combustion Chamber Walls — A Measure to Decrease the Fuel Consumption of I.C. Engines?
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Abstract
Experimental investigations were made with a single-cylinder direct-injection Diesel engine with heat-insulated piston. The most important result is an inferior economy compared with the not insulated aluminum-piston engine. It was found that this phenomenon is not caused by neither a changed combustion process nor increased blowby nor different friction losses, but rather by a drastic increase of the heat transfer coefficient during the first part of combustion with increasing surface temperature. This is taken into account in a modified equation for the heat transfer coefficient. Cycle-simulations using this modified equation show that there is neither a gain in fuel economy of naturally aspirated nor of turbocharged nor of turbocompound Diesel engines with “heat insulated” combustion chamber walls.
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Woschni, G., Spindler, W., and Kolesa, K., "Heat Insulation of Combustion Chamber Walls — A Measure to Decrease the Fuel Consumption of I.C. Engines?," SAE Technical Paper 870339, 1987, https://doi.org/10.4271/870339.Also In
SAE 1987 Transactions: Reciprocating Engines--Spark Ignition and Diesel
Number: V96-4; Published: 1988-09-01
Number: V96-4; Published: 1988-09-01
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