rankel engine

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THE WANKEL ROTARY EN

PRESENTED BYASHISH GOEL1102740032ME-G IIIyr

UNDER GUMR. DEVEN

SASSOCIATE PROF


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Content Introduction

History

Parts of Wankel engine

Principle and Working

Advantages

Disadvantages

Applications


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INTRODUCTION TheWankel engine is a type of internal combust

which an eccentric rotary design is used to convert p

rotating motion instead of using reciprocating pistons.

Its four-phase cycle takesplace in a space between the

oval-like epitrochoid-shaped housing and a rotor that is sito a Reuleaux trianglebut with sides that are somewhat fla

The very compactWankel engine delivers smooth high-r

is commonly called a rotary engine, though this name a

othercompletely different designs.


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Ideas have existed since the 16th century.

German scientist Felix Wankel was the first to put the idea into a woo Funded by the German Aviation Ministry during WWII.o Germany believed that the rotary engine would propel their industry into eventual greatn

Wankel first conceived his rotary engine in 1924 and finally receive

1929. He worked through the 1940s and 1950s to improve the design

Wankel perfected his design and sold the rights for the desig

companies in 1960s.

Mazda produced its first rotary power car in 1961 and created theDivision in 1963.

In 2003, Mazda relaunched the rotary engine with the new MAZDA

In the racing world, Mazda has had great success with both two-rot

cars, and private racers have also had considerable success with sto

Mazda Wankel-engined cars.

HISTORY


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PARTS of WANKEL ENGINE

The rotorhas three convex faces, each of which acts like a piston & each face has a pocket in

is a metal blade that forms a seal to the outside of the combustion chamber. There are also me

the rotor that seal to the sides of the combustion chamber. The rotor has a set of internal gear tewith a gear that is fixed to the housing. The housingis roughly oval in shape (it's actually an ep

the combustion chamber is designed so that the three tips of the rotor will always stay in con

chamber, forming three sealed volumes of gas.

The four sections are: 1. Intake, 2. Compression 3.Combustion 4.Exhaust

The intake and exhaust ports are located in the housing. There are no valves in these ports.

eccentric to the output shaft, the force that the rotor applies to the lobes creates torque in the sha


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PRINCIPLE AND WORKINLike a piston engine, the rotary engine uses the pressure created when

air and fuel is burned. In a piston engine, that pressure is contained in

forces pistons to move back and forth. The connecting rods and crankreciprocating motion of the pistons into rotational motion that can be us

The rotor follows a path that looks like something you'd create with a

path keeps each of the three peaks of the rotor in contact with the housi

separate volumes of gas. As the rotor moves around the chamber, e

volumes of gas alternately expands and contracts. It is the expansion an

draws air and fuel into the engine, compresses it and makes useful poexpand, and then expels the exhaust.

The best way to visualize the action of the engine in the animation at le

the rotor itself, but the cavity created between it and the housing. The

actually a variable-volume progressing-cavity system. Thus there ar

housing, all repeating the same cycle.


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INTAKEThe intake phase of the cycle starts when the

tip of the rotor passes the intake port. At themoment when the intake port is exposed to

the chamber, the volume of that chamber is

close to its minimum. As the rotor moves

past the intake port, the volume of the

chamber expands, drawing air/fuel mixtureinto the chamber. When the peak of the rotor

passes the intake port, that chamber is sealed

off and compression begins.


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COMPRESSIONAs the rotor continues motion around

the housing, the volume of the chambergets smaller and the air/fuel mixture

gets compressed. By the time the face

of the rotor has made it around to the

spark plugs, the volume of the chamberis again close to its minimum. This is

when combustion starts.


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COMBUSTIONMost rotary engines have two spark plugs. The

combustion chamber is long, so the flamewould spread too slowly if there were only one

plug. When the spark plugs ignite the air/fuel

mixture, pressure quickly builds, forcing the

rotor to move. The pressure of combustion,

forces the rotor to move in the direction thatmakes the chamber grow in volume. The

combustion gases continue to expand, moving

the rotor and creating power, until the peak of

the rotor passes the exhaust port.


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EXHAUSTOnce the peak of the rotor passes the exhaust

port, the high-pressure combustion gases arefree to flow out the exhaust. As the rotor

continues to move, the chamber starts to

contract, forcing the remaining exhaust out of

the port. By the time the volume of the

chamber is nearing its minimum, the peak ofthe rotor passes the intake port and the whole

cycle starts again.


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ADVANTAGES OF WANKEL ENGIN Wankel engines gives higher output for similar displacement and p

simple and has fewer moving parts.

The rotor is geared directly to the output shaft, there is no need for

conventional crankshaft, crankshaft balance weights, etc. Smoother flow of power but also the ability to produce more power by

rpm.

Fuel of very low octane number can be used without pre ignition or kn

Its great safety benefit makes it useful in aircraft.

There is no valve operation.

The engine is constructed with an iron rotor within a housing mawhich has greater thermal expansion. This ensures that even a se

Wankel engine cannot seize. It has smaller frontal area than a

equivalent power.

The simplicity of design and smaller size of the Wankel engine also

in construction costs, compared to piston engines of comparable powe


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DISADVANTAGES OF WANKEL E The fuel-air mixture cannot be pre-stored as there is no intake va

Time available for fuel to be injected into a Wankel engine

shorter. More complicated fuel injection technologies are required.

In terms of fuel economy, Wankel engines are generally less ef

stroke piston engines.

Sealing loss is high.

The compression ratio is lower. This lowers the thermal efficie

fuel economy.

It is difficult to expand the engine to more than two rotors.

There can be more carbon monoxide and unburned hydrocarbo

exhaust stream.


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APPLICATIONS OF WANKEL E Used in aircraft.

Racing car.

system of some Mercedes-Benz.

For mini, micro, and micro-mini engine

designs.

The most exotic use of the Wankel

design is in the seat belt pre-tensioner

Go-karts, personal water craft and

auxiliary power units for aircraft.


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