24-01-2011, 04:22 PM
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Prepared By vatsal patel 10 EE 04, Guided By A.B. Solanki Sir
Abstract
In this seminar we discuss about the six stroke engine. It include Introduction, the types of six stroke engine than how to work this six stroke, Factors contributing to increased thermal Efficiency, Reduced Fuel Consumption and Pollutant Emission Advantages & Disadvantages of this engine. And last Conclusion of this seminars: SIX STROKE ENGINE.
Content
Introduction
Types of Six stroke Engine
Working of Six stroke engine
Advantages & Disadvantages
Conclusion
Reference
Introduction
Nikolaus August Otto first designed what is known as the Otto engine or simply the 4 stroke internal combustion engine. Conversion of heat energy liberated by the combustion of the fuel into mechanical energy which rotated the crankshaft was the basic principle of this engine. The 4 stroke engine worked on the principle of the Otto cycle .The 4 stroke engine comprises of the intake stroke, compression stroke, power stroke and finally the exhaust stroke. Fuel was injected in the intake stroke and power from the fuel was derived in the 3rd stroke.
Types of Six stroke Engine
There are three types of six stroke Engine.
1. Crower six stroke engine.
2. Beare Head Six Stroke engine.
3. Bajulaz six stroke engine.
The details of this three types of six stroke Engine are given below:-
1. Crower six stroke engine.
In a six-stroke engine patented in the U.S. by Bruce Crower, after the exhaust stroke, fresh water is injected into the cylinder, and is quickly turned to superheated steam, which causes the water to expand to 1600 times its volume and forces the piston down for an additional stroke.
This design also claims to reduce fuel consumption by 40%.
Crower's six stroke engine features:-
· No cooling system required
· Improves a typical engine’s fuel consumption
· Requires a supply of distilled water to act as the medium for the second power stroke.
2. Beare Head Six Stroke engine.
This engine simply replaces the conventional Four Stroke Engines Cylinder Head. The manufacturers Four Stroke bottom end remains unchanged
The net result is:
Power/torque increases of 35%.
Simpler and less expensive manufacturing and tooling
Reduction of cylinder head reciprocating parts
Lower maintenance costs due to less wearing parts
3. Bajulaz six stroke engine.
The Bajulaz six stroke engine is similar to a regular combustion engine in design. This Engine was invented in 1989 by the Bajulaz S A .
Bajulaz six stroke engine features:-
Reduction in fuel consumption by at least 40%
Two expansions (work) in six strokes
Dramatic reduction in pollution
Liquefied Petroleum Gas
Costs comparable to those of a four-stroke engine combustion engine in design.
Working of 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 injector
10) Heating plug
11) Piston
12) Crankshaft
1st stroke (suction stroke)
The inlet valve(1) is kept open. Due to cranking, the piston moves downward which results in the formation of a pressure difference due to which pure air enters the cylinder (5). The crankshaft completes
rotates for half cycle.
2nd stroke (compression stroke)
The inlet valve closes and the heating chamber valve opens. The piston moves upwards due to cranking forcing the pure air into heating chamber. The air at this stage is converted to high pressure.
3rd stroke (1st power stroke)
The combustion chamber valve opens and the gases of combustion enter the cylinder.
4th stroke (exhaust stroke)
The exhaust valve opens. The piston moves upwards and the exhaust gases are removed via this valve. The crankshaft rotates another half cycle. At this stage the crankshaft completes 2 full cycles.
5th stroke (2nd power stroke)
The heating chamber valve opens and the pure air now at high pressure and high temperature enters the cylinder as shown in the figure which does work on the piston and hence it moves downwards resulting in the 2nd power stroke. The crankshaft completes
another half cycle.
6th stroke
Finally the combustion chamber valve opens the piston moves upwards forcing the pure air into the combustion chamber. The crankshaft will complete 3 full cycles at the end of the 6th stroke.
Advantages & Disadvantages
Two expansions (work) in six strokes:
Multifuel:
Dramatic reduction in pollution:
Liquefied Petroleum Gas:
Cost comparable to those of a four-stroke engine:
CONCLUSION
Drastically reducing fuel consumption and pollution without radically affecting performances would allow the current concept of the automobile to be reassessed.
There is, at this day, no wonder solution for the replacement of the internal combustion engine. Only improvements of the current technology can help it progress within reasonable time and financial limits.
Fuel consumption for mid-sized engines should be within 4 and 5 litres per 100km. and 3 to 4 litres for the small-sized engines.
Automobiles equipped with the six-stroke engine could appear in the market within 3 to 5 years.
Reference
google.com
scribd.com
wikipedia.com
