18-04-2012, 01:04 PM
six stroke engine
SUDHEER.doc (Size: 1.33 MB / Downloads: 93)
INTRODUCTION
The six-stroke engine is a type of internal combustion engine based on the four-stroke engine, but with additional complexity intended to make it more efficient and reduce emissions. Two types of six-stroke engine have been developed since the 1990s:
In the first approach, the engine captures the heat lost from the four-stroke Otto cycle or Diesel cycle and uses it to power an additional power and exhaust stroke of the piston in the same cylinder. Designs use either steam or air as the working fluid for the additional power stroke.[1] The pistons in this type of six-stroke engine go up and down three times for each injection of fuel. There are two power strokes: one with fuel, the other with steam or air. The currently notable designs in this class are the Crower six-stroke engine, invented by Bruce Crower of the U.S. ; the Bajulaz engine by the Bajulaz S.A. company of Switzerland; and the Velozeta Six-stroke engine built by the College of Engineering, at Trivandrum in India.
The second approach to the six-stroke engine uses a second opposed piston in each cylinder that moves at half the cyclical rate of the main piston, thus giving six piston movements per cycle. Functionally, the second piston replaces the valve mechanism of a conventional engine but also increases the compression ratio. The currently notable designs in this class include two designs developed independently: the Beare Head engine, invented by Australian Malcolm Beare, and the German Charge pump, invented by Helmut Kottmann.
IC Engine:
I.C.Engine is a device which uses chemical energy of fuel & it is transformed into thermal energy by combustion to produce mechanical work.
Classification of I.C.Engine :-
1) According type of fuel used
a)Petrol b)Diesel
2) According to type of ignition
a)Spark ignition b) Compression ignition
3) According to number of cylinder
a)Single cylinder b) Multi cylinder Engine
4) According to arrangement of cylinder
a)Vertical engine 2) Horizontal engine 3) Radial engine
5) According to number of stroke
a) 2 stroke engine b) 4 stroke engine
Two Stroke Engine:
It is called 2 stroke engine because of one revolution of crank OR 2 stroke of piston.It Consists of piston ,crank, connecting rod,inlet & outlet Port’s & etc..
The Major disadvantage of 2 stroke engine is that both inlet & outlet valve opens simultaneously ,so that burnt fuel , fresh air & fuel mixture burnt simultaneously therefore fresh air & fuel may be exhausted without doing any work & also this may leads to high pollution & this what reason why “GOVT OF INDIA” Banned manufacturing of 2 stroke engine.
Two Stroke Engine
The two stroke engine employs both the crankcase and the cylinder to achieve all the elements of the Otto cycle in only two strokes of the piston.
Intake
The fuel/air mixture is first drawn into the crankcase by the vacuum that is created during the upward stroke of the piston. The illustrated engine features a poppet intake valve; however, many engines use a rotary value incorporated into the crankshaft.
SUDHEER.doc (Size: 1.33 MB / Downloads: 93)
INTRODUCTION
The six-stroke engine is a type of internal combustion engine based on the four-stroke engine, but with additional complexity intended to make it more efficient and reduce emissions. Two types of six-stroke engine have been developed since the 1990s:
In the first approach, the engine captures the heat lost from the four-stroke Otto cycle or Diesel cycle and uses it to power an additional power and exhaust stroke of the piston in the same cylinder. Designs use either steam or air as the working fluid for the additional power stroke.[1] The pistons in this type of six-stroke engine go up and down three times for each injection of fuel. There are two power strokes: one with fuel, the other with steam or air. The currently notable designs in this class are the Crower six-stroke engine, invented by Bruce Crower of the U.S. ; the Bajulaz engine by the Bajulaz S.A. company of Switzerland; and the Velozeta Six-stroke engine built by the College of Engineering, at Trivandrum in India.
The second approach to the six-stroke engine uses a second opposed piston in each cylinder that moves at half the cyclical rate of the main piston, thus giving six piston movements per cycle. Functionally, the second piston replaces the valve mechanism of a conventional engine but also increases the compression ratio. The currently notable designs in this class include two designs developed independently: the Beare Head engine, invented by Australian Malcolm Beare, and the German Charge pump, invented by Helmut Kottmann.
IC Engine:
I.C.Engine is a device which uses chemical energy of fuel & it is transformed into thermal energy by combustion to produce mechanical work.
Classification of I.C.Engine :-
1) According type of fuel used
a)Petrol b)Diesel
2) According to type of ignition
a)Spark ignition b) Compression ignition
3) According to number of cylinder
a)Single cylinder b) Multi cylinder Engine
4) According to arrangement of cylinder
a)Vertical engine 2) Horizontal engine 3) Radial engine
5) According to number of stroke
a) 2 stroke engine b) 4 stroke engine
Two Stroke Engine:
It is called 2 stroke engine because of one revolution of crank OR 2 stroke of piston.It Consists of piston ,crank, connecting rod,inlet & outlet Port’s & etc..
The Major disadvantage of 2 stroke engine is that both inlet & outlet valve opens simultaneously ,so that burnt fuel , fresh air & fuel mixture burnt simultaneously therefore fresh air & fuel may be exhausted without doing any work & also this may leads to high pollution & this what reason why “GOVT OF INDIA” Banned manufacturing of 2 stroke engine.
Two Stroke Engine
The two stroke engine employs both the crankcase and the cylinder to achieve all the elements of the Otto cycle in only two strokes of the piston.
Intake
The fuel/air mixture is first drawn into the crankcase by the vacuum that is created during the upward stroke of the piston. The illustrated engine features a poppet intake valve; however, many engines use a rotary value incorporated into the crankshaft.