Heat Insulation of Combustion Chamber Walls — A Measure to Decrease the Fuel Consumption of I.C. Engines?

Autor:	Konrad Kolesa, Walter Spindler, Gerhard Woschni
Rok vydání:	1987
Předmět:	Internal combustion engine Chemistry Naturally aspirated engine Internal combustion engine cooling Mechanics Diesel cycle Combustion chamber Combustion Diesel engine Automotive engineering Heat engine
Zdroj:	SAE Technical Paper Series.
ISSN:	0148-7191
DOI:	10.4271/870339
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4c8f8c9a4725475c8e2bb2ad0e395577 https://doi.org/10.4271/870339 Zobrazit plný text záznamu