Wankel rotary engine

1/21/2020
ROTARY ENGINE
LAB Assignment
MUHAMMAD ADNAN
2019-ME-154

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(1)Wankel rotary engine
(2)JET Engine

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WANKEL ROTARY ENGINE
(i) Four stroke engine
(ii) Rotor on eccentric shafts
(iii) Design to minimize volume but to maximize
The compression ratio
Reuleax Rotor, (Triangular shaped with
equivalent width)

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The Wankel engine is a type of internal combustion engine using
an eccentric rotary design to convert pressure into rotating
motion. All parts rotate in one direction, as opposed to the
common reciprocating piston engine, which has pistons instantly
and rapidly changing direction 180 degrees.
Define:
The Wankel engine is a type of internal combustion
engine using an eccentric rotary design to convert
pressure into rotating motion.

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CONCEPT:
The design was conceived
by German engineer Felix Wankel. Wankel
received his first patent for the engine in 1929.
He began development in the early 1950s
at NSU, completing a working prototype in
1957.[1]
NSU subsequently licensed the design
to companies around the world, who have
continually added improvements.
DESIGN:
The Wankel engine has the advantages of compact
design and low weight over the most commonly

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used internal combustion engine employing
reciprocating pistons. These advantages have given
rotary engine applications in a variety of vehicles
and devices,
including: automobiles, motorcycles, racing
cars, aircraft, go-karts, jet
skis, snowmobiles, chainsaws, and auxiliary power
units. The power-to-weight ratio has reached over
one horsepower per pound in certain engines.[2]
The
engines produced are of spark ignition,
with compression ignition engines having been built
only in research projects.
In the Wankel engine, the four strokes of an Otto
cycle occur in the space between each face of a
three-sided symmetric rotor and the inside of a
housing. The oval-like epitrochoid-shaped housing
surrounds a triangular rotor with bow-shaped faces
similar in appearance to a Reuleaux triangle.[3]
The
theoretical shape of the rotor between the fixed
apexes is the result of a minimization of the volume
of the geometric combustion chamber and a
maximization of the compression ratio,
respectively.[4][5]
arbitrary apexes of the rotor is
maximized in the direction of the inner housing
shape with the constraint that it not touch the
housing at any angle of rotation (an arc is not a
solution of this optimization problem).

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HOUSING
(i) Coolant passages
(ii) Intake and exhaust ports
(iii) Spark plugs

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Housing of rotary engine
OUTPUT shaft
The lobe acts sort of like the crankshaft in a
piston engine. As the rotor follows its path around
the housing, it pushes on the lobes. Since the lobes
are mounted eccentric to the output shaft, the force
that the rotor applies to the lobes creates torque in
the shaft, causing it to spin

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The shaft passes
through all the housings.
APEX
The apex seals of a rotary engine are curved metal
inserts that are in contact with the engine housing
as the rotor moves. These three apex seals, one at
each apex, are the only part of the rotor that has
contact with the inside housing chamber.

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OPERATIONS
The Rotary engine also uses the four stroke
combustion cycle.
(i) The heart of rotary engine is the rotor which
is equivalent to piston.
(ii) The rotor is mounted on a large circular lobe
on the output shaft.
(iii) The orbit inside the housing,it pushes the
lobe arpund its tightens housing.
A rotary engine is an internal
combustion engine, like the engine in your car,
but it works in a completely different way than the
conventional piston engine. In a piston engine,
the same volume of space (the cylinder)
alternately does four different jobs -- intake,
compression, combustion and exhaust.

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(i) Intake
(ii) Compression
(iii) Ignition
(iv) Exhaust

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ADVANTAGES
One of the major advantages of a rotary engine is
its mechanical simplicity. A rotary engine contains
far fewer parts than a comparable piston engine.
This may decrease the cost of design and
manufacture. This also leads to decreased weight.
(i) Much simpler ,its piston counter part makes
it more reliable.
(ii) Power to weight ratio is superior than piston
engines.
(iii) Smooth power flow and high RPM.
(iv) No seizure at high temperature.
(v) Less vibrations due to absence of
reciprocatory parts.

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Challenges
(i) Consume more fuel because the
thermodynamic eefficiency of engine is
reduced by long combustion chamber shape
and low compression ratio.
(ii) Manufacturing cost can be higher.
(iii) hey also
have problems with rotor sealing as a
result of uneven temperatures in the

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combustion chamber since combustion
only occurs in one portion of the engine.
APPLICATIONS
(i) the currently used is MAZDA RX8.
(ii) These advantages have given rotary engine
applications in a variety of vehicles and
devices, including: automobiles,
motorcycles, racing cars, aircraft, go-karts,
jet skis, snowmobiles, chainsaws, and
auxiliary power units. The power-to-weight
ratio has reached over one horsepower per
pound in certain engines.

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FUTURE ENGINES
(i) Fuel injection type rotary engine
(ii) Stratified charge type rotary engine
(iii) Super charge type rotary engine
(iv) Diesel rotary engine
(v) Multi-rotor type rotary engines

Wankel rotary engine

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