Six Stroke Engine Final

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A Seminar PresentationOn


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TABLE OF CONTENT

IntroductionTypes of Six stroke engines

Bajulaz Six stroke engine

Beare Head Six stroke engineDual fuel Six stroke engine

Comparison

Specifications

Features

Performance and Economy

Conclusion


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INTRODUCTION

The six-stroke engine is a type of internal combustion

engine based on the four-stroke engine with additional

complexity.

First developed in early 1890s by Samuel Griffin.

Advancement is the Dual fuel six stroke diesel

engine.

Also invented by INDIANS named as VELOZETAand

NIYKADOsix stroke engines.


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APPROACHES FOR SIX STROKE

ENGINE DESIGN

First approach

There is two additional strokes by themain 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.


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TYPES

SIX STROKE

ENGINE

FIRST

APPROACH

Griffin six

stroke engine

Bajulaz six

stroke engine

Crower sixstroke engine

Velozeta six

stroke engine

SECOND

APPROACH

Beare head sixstroke engine

M4 +2 engine


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BAJULAZ SIX STROKE 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 injector10.Heater plug

STROKE 1Intake of pure air in thecylinder.

Fig 1.Cross sectional view of Bajulaz Engine [1]


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STROKE 2 STROKE 3

Compression of pure air in

heating chamber.

Release of combustion

gases in the cylinder.

Fig 2. Stroke 2 [1] Fig 3. Stroke 3 [1]


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STROKE 4 STROKE 5

Release of pure air

into cylinder.

Exhaust of the

combustion gases.

Fig 4. Stroke 4 [1] Fig 5. Stroke 5 [1]


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STROKE 6

Recompression of pure air

in the combustion chamber.

Fig 6. Stroke 6 [1]


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BEARE HEAD SIX STROKE ENGINE

Fuel ignition with

piston at TDC.

Rotary valve opens,

allowing exhaust to

escape.


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Begin of Exhauststroke at BDC.

Intake of chargeinto Cylinder.


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Mixing of Gasolinewith air into the

combustion chamber.

Top piston nearlycloses complete inlet

port and the

compression begins.


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Combustion chambercompletely sealed andready for the

combustion.

Explosion forces

the piston down toturn the engine's

crankshaft and

power is delivered.


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DUAL FUEL SIX STROKE ENGINE

This engine runs by two fuels i.e. diesel(primary

fuel) and methanol (secondary fuel).

Fig 7. Working of Dual fuel six stroke engine [2] Fig 8. Prototype of six

stroke engine [2]


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PV DIAGRAMS

Fig 9. p-V diagrams for Otto cycle[3]

Fig 10. p-V diagrams for Dual cycle[3]


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SPECIFICATIONS

Table 1. Difference of valve timing for same cylinder design[4]

Four Stroke Diesel

Engine

Six Stroke Diesel

EngineEngine Type DI, Single cylinder, Air cooled, OHVBore x Stroke [mm] 82 x 78Displacement [cc] 412Top Clearance [mm] 0.9Cavity Volume [cc] 16Compression Ratio 21Intake Valve Open 100 bTDC 70bTDCIntake Valve Close 400 aBDC 450aBDCExhaust Valve Open 450bBDC 400bBDCExhaust Valve Close 120aTDC 30aTDCValve Overlap 220 100


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COMPARISONS

Comparison between Four Stroke & Six Stroke diesel engines

Engine Parameters

Four Stroke

Diesel Engine

Six Stroke

Diesel Engine

Engine Speed Ne [rpm] 2007 2016

Supplied combustion heat per cycle

Qt [KJ/cycle] 0.50 0.68

Supplied combustion heat per unit time H t[KJ/s]

8.36 7.62

Intake air flow per cycle

Ma[mg/cycle] 358.7 371.4

Injection quantity per cycle

Mf[mg/cycle] 11.8 16

Excess air ratio 2.40 1.83

Intake air flow per unit time

Ma[g/cycle] 6.00 4.16

Injection quantity per unit time

Mf[g/sec] 0.197 0.179Brake torque Tb[N-m] 15.52 15.28

Brake power Lb[KW] 3.26 3.24

BSFC. b [ g / KW-h] 217.9 520.3

IMEP Pi[Kgf / cm2] 5.94 4.37

Indicated torque Ti[N-m] 19.10 18.71

Indicated power Li[KW] 4.01 3.75

ISFC bi[g / KW-h ] 177.2 163.3

Table 2. Difference on the basis of engine parameters[4]


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Comparison between Six Stroke Diesel & Dual Fuel Six Stroke engines

Engine Parameters Six Stroke Diesel Engine Dual Fuel Six Stroke

Diesel Engine

Engine Speed Ne [rpm] 2016 2006

Injection quantity per cycle

(Second Combustion Stroke)

Mf2[mg/cycle]

8.0

(Diesel Fuel)

17.2

(Methanol)

Excess air ratio 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

Table 3. Difference between diesel & dual fuel six stroke engines[4]


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IMPROVEMENTS IN EXHAUST

Characteristic /

Engines

Four Stroke

Diesel

Engine

Six Stroke

Diesel Engine

Dual Fuel Six

Stroke Engine

Nitrous Oxide [ppm]

( % improvement) 768

113

(85.3%)

90.5

(88.2%)

Soot [%]

(%improvement) 6.8

28.8

(- 323.5%)

0

(100%)

Indicated specific heat

consumption bi [MJ/KW-

h]

(% improvement)

7.51 6.61

(12.0%)

6.37

(15.2%)

Table 4. Comparison among engines on the basis of Exhaust[5]


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ADVANTAGES

Reduction in fuel consumptionby at least 40%.Two expansions(work/Power stroke) in six strokes.

Dramatic reduction in pollution ( up to 65%).

Higher overall efficiency .Lowerengine 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.


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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.

Lack of perfect coordination between valves.


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APPLICATIONS

Automobiles, heavy goods, construction-

site and farm vehicles.

Motor-pumps, generator sets, stationaryengines etc. Intended for agriculture and

industry.

150cc six-stroke Taiwanesesingle-cylinder

bike fromYingangis ready to roll.


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CONCLUSION

Drastically reducing fuel consumption (by 40%) andpollution (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 temperatureand therefore

increases in the overall efficiency.


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REFERENCES

[1]http://www.bajulazsa.com/Site/sixstrokeexplanations.html

[2] http://sixstroke.com/specifications.htm

[3] http://en.wikipedia.org/wiki/Six-stroke_engine

[4] Conklina J. C. and Szybist J. P., "A Highly EfficientSix-Stroke Internal Combustion Engine Cycle withWater Injection for In-Cylinder Exhaust HeatRecovery", Energy, Volume 35, Issue 4, pp. 1658-

1664 (2010).[5] Crower B. Method and apparatus for operating aninternal combustion engine. United States patentapplication 20070022977; 2005.


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Six Stroke Engine Final