ISSN Online: 2377-424X
International Heat Transfer Conference 12
Dual Fuel Combustion in a Cylinder Compression and Expansion Process
摘要
The introduction of alternative fuels such as natural gas (NG), liquefied petroleum gas (LPG), ethanol and
methanol for engines is likely to occur at an increasing rate in the near future because there are important
emission and resource benefits. While these fuels, are not generally suitable for CI (diesel) engines because of
their low cetane numbers, the dual-fuel (DF) concept using pre-mixed alternative fuel ignited by a pilot diesel
fuel spray provides a solution. In this program, fundamental experimental studies have been followed to study
NG-DF constant volume combustion and a corresponding 3-D Finite Volume Method (FVM) code has been
developed. The model has now been extended to a variable volume, closed system, by incorporating a moving
boundary (piston) allowing combustion during compression and expansion to be studied. Model calibration has
been obtained using experiments on a diesel/dual fuel engine with good agreement between the experimental and
numerical pressure-time data. Parametric studies using this model for a range of conditions are available.