11-06-2013, 04:54 PM
SIX STROKE DIESEL ENGINE
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INTRODUCTION
The six-stroke engine is a type of internal combustion engine based on the four-stroke engine.
First developed in early 1990’s
Advancement is the Duel fuel six stroke diesel engine
More efficient & reduce emissions.
Approaches for six stroke engine design
First approach
There is two additional strokes by the main piston as fifth and sixth stroke
Second approach
It uses a second opposed piston which moves at half the cyclical rate of the main piston
SIX STROKE ENGINE
Intake valve
Heating chamber valve
Combustion chamber valve
Exhaust valve
Cylinder
Combustion chamber
Air heating chamber
Wall of combustion chamber
Fuel injector
Heater plug
ADVANTAGES
Reduction in fuel consumption by at least 40%
Two expansions(work/Power stroke) in six strokes
Dramatic reduction in pollution ( up to 65%)
Higher overall efficiency
Lower engine temperature & noise level
Due to more air intake, the cooling system is improved
Better scavenging and more extraction of work per cycle
Less inertia due to lightness of moving parts
DISADVANTAGES
Brake power & indicated power per cycle per cylinder is comparatively lesser
Engine size increases due to many number of cylinders & additional components
Higher manufacturing cost of six stroke engine
CONCLUSION
Drastically reducing fuel consumption (by 40%) and pollution (by 60-90%) without radically affecting performances
For the dual fuel six-stroke engine, soot & nitrous oxide was practically eliminated by a small amount of methanol in the second combustion process.
It enables lower engine temperature and therefore increases in the overall efficiency.