6 stroke diesel engine (rai)
TRANSCRIPT
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J.S.S. Academy of Technical EducationDepartment of Mechanical Engineering
A Seminar Presentation On
SIX STROKE DIESEL ENGINE
Presented By
PRASIDH. RAI. KUSN: 1JS06ME031
8th Semester
Internal Guide
B.V.RAGHAVENDRAAssistant Professor
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CONTENTS
IntroductionTypes of Six stroke enginesBajulaz Six stroke Diesel engineDual fuel Six stroke engineComparisonSpecificationsFeaturesPerformance and economyConclusion
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INTRODUCTIONThe 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.
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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
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TYPES:SIX STROKE ENGINE
FIRST APPROACH
Griffin six stroke engine
Bajulaz six stroke engine
Crower six stroke engine
Velozeta six stroke engine
SECOND APPROACH
Beare head six stroke engine
Charge pump engine
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BAJULAZ SIX STROKE ENGINE
1. Intake valve2. Heating chamber valve3. Combustion chamber valve4. Exhaust valve5. Cylinder 6. Combustion chamber7. Air heating chamber8. Wall of combustion chamber9. Fuel injector 10.Heater plug
STROKE 1Intake of pure air in the cylinder
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STROKE 2 STROKE 3
Compression of pure air in heating chamber
Release of combustion gases in the cylinder
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STROKE 4 STROKE 5
Release of pure air into cylinder
Recompression of pure air in the combustion chamber
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STROKE 6
Exhaust of combustion gases
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DUAL FUEL SIX STROKE ENGINE
This engine runs by two fuels i.e. diesel (primary fuel) and methanol (secondary fuel)
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PV DIAGRAMS
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SPECIFICATIONSTable 1. Specifications of the test engine:
Four stoke Six stroke Diesel Engine Diesel Engine
Engine type DI, Single cylinder, Air cooled, OHV
Bore x Stroke [mm] 82 x 78
Displacement [cc] 412
Top Clearance [mm] 0.9
Cavity Volume [cc] 16
Compression ratio 21
Intake Valve Open 100 BTDC 70 BTDC
Intake valve Close 1400 BTDC 1450 BTDC
Exhaust Valve Open 1350 ATDC 1400 ATDC
Exhaust Valve Close 120 ATDC 30 ATDC
Valve Overlap 220 100
Rated power 5.9 kW /3000rpm
Base Engine ----------------
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COMPARISONSComparison between four stroke & six stroke diesel engines
Engine ParametersFour Stroke
Diesel EngineSix Stroke
Diesel Engine
Engine Speed Ne [rpm] 2007 2016
Supplied combustion heat per cycleQt [KJ/cycle] 0.50 0.68
Supplied combustion heat per unit time Ht [KJ/s]8.36 7.62
Intake air flow per cycleMa [mg/cycle] 358.7 371.4
Injection quantity per cycleMf [mg/cycle] 11.8 16
Excess air ratio λ 2.40 1.83
Intake air flow per unit timeMa [g/cycle] 6.00 4.16
Injection quantity per unit timeMf [g/sec] 0.197 0.179
Brake 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
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Comparison between six stroke diesel & dual fuel six stroke engines
Diesel Fuel Six Stroke
Diesel Engine
Dual Fuel Six Stroke
Diesel 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)
Mf2 [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
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Lower maintenance costs due to less wearing parts (cylinder head)
Longer service intervals possible due to lower operating temperatures recorded
Increase in thermal efficiency by more than 20%
Reduced fuel consumption
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IMPROVEMENTS IN EXHAUST
Four Stroke
Diesel Engine
Six Stroke Diesel
Engine
Dual Fuel Six
Stroke Engine
Nitrous Oxide [ppm]
( % improvement) 768113
(85.3%)
90.5
(88.2%)
Soot [%]
(%improvement) 6.828.8
(- 323.5%)
0
(100%)
Indicated specific heat consumption
bi’ [MJ/KW-h]
(% improvement)
7.51 6.61
(12.0%)
6.37
(15.2%)
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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
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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
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APPLICATIONS
Automobiles, heavy goods, construction-site and
farm vehicles.
motor-pumps, generator sets, stationary engines,
etc....intended for agriculture and industry.
Motorboats
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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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THANK YOU