Burn Rate and Instantaneous Heat Flux Study of Iso-Octane, Toluene and Gasoline in a Spray-Guided Direct-Injection Spark-Ignition Engine

Document Number: 2008-01-0469

Date Published: April 2008

Author(s):
Xiaowei Wang - Univ. of Oxford
Philip Daniel Price - Univ. of Oxford
Charles Richard Stone - Univ. of Oxford
Dave Richardson - Jaguar Cars, Ltd.

Abstract:
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.

File Size: 469K
Product Status: In Stock

Included in: SP-2187

See other papers presented at SAE World Congress & Exhibition, April 2008, Detroit, MI, USA, Session: SI Combustion (Part 3 of 3) Basic Combustion/Efficiency/Ignition

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