Design and Simulation of Two Stroke Engines

Design and Simulation of Two-Stroke Engines
installed in direct thermal contact with, the hot cylinder head. However, this gives an undesirable
subsidiary effect, as this leaves some residual hydrocarbons in the passage between the
injector and the cylinder after the piston has passed by in the trapping process, and these are
then carried into, and potentially out of, the cylinder on the next scavenge process or are
exposed to the exhaust gas by the downward travel of the piston during the blowdown phase.
The Orbital Engine Corporation of Perth in Western Australia has been very active in the
design and development of air-blast injectors and of vehicle engines fitted with such injectors
[7.26, 7.38, 7.45]. Plate 7.6 shows one of their 1.2-liter, three-cylinder, naturally aspirated,
spark-ignited engines with air-assisted fuel injection which has been employed in prototype
automobiles [7.26, 7.38]. Plate 7.7 shows a moped-scooter two-wheeler fitted with the Orbital
SEFIS system [7.45].
Direct fuel injection using liquid-only injection [Ref. 7.54] is illustrated in Plate 7.8. This
system has been developed by Ficht in Germany in collaboration with Outboard Marine Corporation.
The design originally stems from research work carried out at the Technische
Hochschule of Zwickau [Ref. 7.23].
Plate 7.6 The Orbital three-cylinder 1.2-liter car engine with air-assisted direct fuel injection
(courtesy of Orbital Engine Corporation Limited).
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