Burn Rate and Instantaneous Heat Flux Study of Iso-octane, Toluene and Gasoline in a Spray-Guided Direct-Injection Spark-Ignition Engine
Date Published: 2008-04-14
Paper Number:2008-01-0469
DOI: 10.4271/2008-01-0469
Citation:
Wang, X., Price, P., Stone, R., and Richardson, D., "Burn Rate and Instantaneous Heat Flux Study of Iso-octane, Toluene and Gasoline in a Spray-Guided Direct-Injection Spark-Ignition Engine," SAE Technical Paper 2008-01-0469, 2008, doi:10.4271/2008-01-0469.
The burn rate and the instantaneous in-cylinder heat transfer have been studied experimentally in a spray-guided direct-injection spark-ignition engine with three different fuels: gasoline, iso-octane and toluene. The effects of the ignition timing, air fuel ratio, fuel injection timing and injection strategy (direct injection or port injection) on the burn rate and the in-cylinder heat transfer have been experimentally investigated at a standard mapping point (1500 rpm and 0.521 bar MAP) with the three different fuels.
The burn rate analysis was deduced from the in-cylinder pressure measurement. A two-dimensional heat conduction model of the thermocouple was used to calculate the heat flux from the measured surface temperature. An engine thermodynamic simulation code was used to predict the gas-to-wall heat transfer. A modified Woschni correlation was adopted to model the engine heat transfer and this showed good agreement with the experimentally obtained in-cylinder heat flux results.
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