Operation of a Spark Ignition Engine with Superheated Fuel Vapor 18ICES/035
Authors
Demir Bayka - Middle East Technical University Anil Karel - STM-Defense Engineering Technologies Co.
Deniz Çakar - TAI-Turkish Aerospace Industry
Abstract
The quality of combustion in a spark ignition engine is improved by superheating the fuel using the energy of the exhaust gases. A double heat exchanger system is designed for this purpose. The engine automatically switches to superheated vapor operating mode at around 150 kPa (gage) and 250 C vapor pressure and temperature. The engine operates with an equivalence ratio of 0.7 without any power loss. The equivalence ratio can be less than 0.6 under partial load operation. At any fuel setting, the system allows for a wide variation in the throttle valve position. CO, HC and NOx emissions are reduced down to the levels of catalytic filter applied gasoline engines without using a catalytic filter.