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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.

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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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PRESENTED BY

RENGANATHAN.M

DEPT OF MECHANICAL ENGG.

SABARI RAJ.M.G

DEPT OF MECHANICAL ENGG.

ANNA UNIVERSITY

DINDIGUL

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