six stroke diesel engine
Post on 30-Oct-2014
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Department of Mechanical EngineeringA Seminar Presentation On
Introduction Types of Six stroke engines Bajulaz Six stroke Diesel engine Dual fuel Six stroke engine Comparison Specifications Features Performance and economy Conclusion
The six-stroke engine is a type of internal combustion engine based on the four-stroke engine.
First developed in early 1990sAdvancement 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 approachIt uses a second opposed piston which moves at half the cyclical rate of the main piston
Griffin six stroke engineBajulaz six stroke engine Crower six stroke engine SIX STROKE ENGINE Velozeta six stroke engine Beare head six stroke engine Charge pump engine
FIRST APPROACH
SECOND APPROACH
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
Intake of pure air in the cylinder
STROKE 1
STROKE 2Compression of pure air in heating chamber
STROKE 3Release of combustion gases in the cylinder
STROKE 4Recompression of pure air in the combustion chamber
STROKE 5Release of pure air into cylinder
STROKE 6Exhaust of combustion gases
This engine runs by two fuels i.e. diesel (primary fuel) and methanol (secondary fuel)
Table 1. Specifications of the test engine:
Engine type Bore x Stroke [mm] Displacement [cc] Top Clearance [mm] Cavity Volume [cc] Compression ratio Intake Valve Open Intake valve Close Exhaust Valve Open Exhaust Valve Close Valve Overlap Rated power
Four stoke Six stroke Diesel Engine Diesel Engine DI, Single cylinder, Air cooled, OHV 82 x 78 412 0.9 16 21 100 BTDC 1400 BTDC 1350 ATDC 120 ATDC 220 5.9 kW /3000rpm Base Engine ---------------70 BTDC 1450 BTDC 1400 ATDC 30 ATDC 100
Comparison between four stroke & six stroke diesel enginesEngine Parameters Engine Speed Ne [rpm] Four Stroke Diesel Engine 2007 0.50 8.36 Intake air flow per cycle Ma [mg/cycle] Injection quantity per cycle Mf [mg/cycle] Excess air ratio Intake air flow per unit time Ma [g/cycle] Injection quantity per unit time Mf [g/sec] Brake torque Tb [N-m] Brake power Lb [KW] BSFC. b [ g / KW-h] IMEP Pi [Kgf / cm2] Indicated torque Ti [N-m] Indicated power Li [KW] ISFC bi [g / KW-h ] 358.7 11.8 2.40 6.00 0.197 15.52 3.26 217.9 5.94 19.10 4.01 177.2 Six Stroke Diesel Engine 2016 0.68 7.62 371.4 16 1.83 4.16 0.179 15.28 3.24 520.3 4.37 18.71 3.75 163.3
Supplied combustion heat per cycle Qt [KJ/cycle] Supplied combustion heat per unit time Ht [KJ/s]
Comparison between six stroke diesel & dual fuel six stroke enginesDiesel Fuel Six Stroke Diesel Engine Engine Speed Ne [rpm] Supplied combustion heat per cycle Qt [kJ/cycle] Injection quantity per cycle (First Combustion Stroke) Mf1 [mg/cycle] 0.68 8.0 (Diesel Fuel) 2016 Dual Fuel Six Stroke Diesel Engine 2006
Injection quantity per cycle(Second Combustion Stroke) Mf2 [mg/cycle] Excess air ratio Brake torque Tb [N-m] Brake power Lb [kW] B.S.F.C. b [ g / kW.h]
8.0(Diesel Fuel)
17.2(Methanol)
1.86 6.18 1.52 504.0 4.56 21.68 3.45 155.5
1.93 6.08 1.5 777.7 4.75 20.38 2.98 236.2
I.M.E.P. Pi [kgf / cm2] Indicated torque Ti [N-m] Indicated power Li [kW] I.S.F.C. bi [g / kW.h ] Indicated specific heat consumption bi [MJ /kW.h]
6.61
6.37
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
Four StrokeDiesel Engine Nitrous Oxide [ppm]
Six Stroke DieselEngine 113
Dual Fuel SixStroke Engine 90.5
( % improvement)Soot [%] (%improvement) Indicated specific heat consumption bi [MJ/KW-h] (% improvement)
768
(85.3%)28.8
(88.2%)0 (100%)
6.8
(- 323.5%)
7.51
6.61 (12.0%)
6.37 (15.2%)
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 cycleLess inertia due to lightness of moving parts
Brake power & indicated power per cycle percylinder is comparatively lesser
Engine size increases due to many number ofcylinders & additional components Higher manufacturing cost of six stroke engine
Automobiles, heavy goods, construction-site andfarm vehicles.
motor-pumps, generator sets, stationary engines,etc....intended for agriculture and industry. Motorboats
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 increasesin the overall efficiency.
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