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ADVANCED SIX STROKE I.C ENGINES
Contents
Introduction Concept of six stroke I.C engine Types of six stroke engine Take as example Bajulez six stroke engine Strokes involved Duel fuel using technique Bear head six stroke engine Comparison of six stroke to four stroke Application of six stroke engine Advantages Disadvantages conclusion
Introduction
Internal combustion engine based on the four-stroke engine.
First developed in two approach
Advancement is the Duel fuel six stroke diesel engine
More efficient & reduce emissions.
Concept of six stroke
Combination of “two stroke and four stroke technology ”has given the engine its name – the “six stroke engine” (2 + 4 = 6).
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
Types of six stroke engine
FIRST APPROACH
Griffin six stroke engine
Bajulaz six stroke engine
Velozeta six stroke engine
Crower six stroke engine
SECOND APPROACH
Charge pump engine
For Presentation
Take
Bajulaz six stroke engine (Duel fuel)
and
Beare head engine (Single fuel)
BAJULAZ SIX STROKE I.C.ENGINE
An over view of the bajulaz six stroke engine
BAJULAZ SIX STROKE I.C.ENGINE
1. Intake valve
2. Heating chamber valve
3. Combustion chamber valve
4. Exhaust valve
5. Cylinder
6. Combustion chamber
7. Air heating chamber
8. Wall of combustion chamber
9. Fuel injector
10.Heater plug
STROKES INVOLVED IN ENGINE
STROKE 1
Intake of pure air in the cylinder
STROKES INVOLVED IN ENGINE
STROKE 2
Compression of Pure air in heating chamber
STROKES INVOLVED IN ENGINE
STROKE 3
Release of combustion gases in the cylinder
STROKES INVOLVED IN ENGINE
STROKE 4
Recompression of pure air in the combustion
chamber
STROKES INVOLVED IN ENGINE
STROKE 5
Release of pure air into cylinder
STROKES INVOLVED IN ENGINE
STROKE 6
Exhaust of combustion gases
DUAL FUEL SIX STROKE ENGINE
This engine runs by two fuels i.e. diesel (primary fuel) and methanol (secondary fuel)
Beare Head six stroke I.C engine
An over view of the Beare head engine
Strokes involved in engine
The intake stroke happens. This action creates suction.
Atomized fuel in this case gasoline mixed with air, into the combustion chamber.
Strokes involved in engine
Top piston nearly closes complete inlet
port and The compression begins.
Strokes involved in engine
Combustion chamber completely sealed and ready for
the combustion.
Strokes involved in engine
Fuel ignites with piston at the top dead
center.
Strokes involved in engine
Rotary valve opens, allowing exhaust to escape
Strokes involved in engine
Exhaust stroke begins
when the piston is at bottom dead center
Strokes involved in engine
Exhaust stroke ends, intake begins. rotary valve cuts exhaust .intake of charge into cylinder due to pressure difference.
COMPARISONS
Six Stroke Diesel
Engine
Methanol Six Stroke
Engine
Engine Speed Ne [rpm] 2016 2006
Supplied combustion heat per cycle
Qt [kJ/cycle]0.68
Injection quantity per cycle
(First Combustion Stroke)Mf1 [mg/cycle]
8.0
(Diesel Fuel)
Injection quantity per cycle
(Second Combustion Stroke)f2 [mg/cycle]
8.0
(Diesel Fuel)
17.2
(Methanol)
Excess air ratio λ 1.86 1.93
Brake torque Tb [N-m] 6.18 6.08
Brake power Lb [kW] 1.52 1.5
B.S.F.C. b [ g / kW.h] 504.0 777.7
I.M.E.P. Pi [kgf / cm2] 4.56 4.75
Indicated torque Ti [N-m] 21.68 20.38
Indicated power Li [kW] 3.45 2.98
I.S.F.C. bi [g / kW.h ] 155.5 236.2
Indicated specific heat consumption
bi’ [MJ /kW.h]6.61 6.37
Comparison between Duel fuel six stroke engines
Torque-Angle diagram of six stroke engine
P-V Diagram
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
Applications
Automobiles, heavy goods, construction-site and
farm vehicles.
motor-pumps, generator sets, stationary engines,
etc....intended for agriculture and industry.
Motorboats
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.
www.themegallery.com
REFERENCES
BAJULAZ.S,(2007)’ SIX STROKE ENGINE ACCESSED-BPS PUBLICATION,VOL 12
LYONS.P(2006),’INSIDE BRUCE CROWERS SIX STROKE ENGINE”-TATA MCGRAW HILL ,FIFTH EDITION
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THANK YOU
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PRESENTED BY
RENGANATHAN.M
DEPT OF MECHANICAL ENGG.
SABARI RAJ.M.G
DEPT OF MECHANICAL ENGG.
ANNA UNIVERSITY
DINDIGUL
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