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split engine

VIEWS: 4 PAGES: 22

									SPLIT ENGINE
1. Abstract.
2. Introduction.
3. Scuderi split cycle engine.
4. How it works?
5. How does the air get from one cylinder to the other?
6. When and where is the fuel injected?
7. P-V curves.
Abstract :
   The first four-stroke piston was developed in 1876.
   This four-stroke piston arrangement is still the
    primary design of engines built today.
   Todays engines operate at only 33% efficiency.this
    means that only 1/3 of the energy in each gallon of
    fuel is used-the rest is lost through friction and heat.
   With over a billion engines currently in
    worldwide,even small gains in efficiency will have
    impacts on the economy,dependency on foreign
    oil,and the environment.
Introduction :
   Split engines appeared as early as 1914.
   Split cycle engines separate the four strokes of
    intake, compression power, and exhaust into two
    separate but paired cylinders.
   The first cylinder is used for the intake and
    compression. The compressed air is transferred
    through a connecting passage or tube from the
    compression cylinder into the second cylinder where
    combustion and exhaust occur.
   Many different split cycle
    configuration have since been
    developed ;however, none have
    matched the efficiency or
    performance of conventional
    engines.
   Problems with previous split cycle
    engines :
   Poor breathing or volumetric
    efficiency.
   Low thermal efficiency.
       Scuderi split cycle engine

1. This engine is proposed by late Carmelo scuderi (1925
   -2002) who spent over 40 years inventing, developing
   and commercializing new technology.
2. The Scuderi split cycle engine technology changes the
   heart of the I.C engine.
3. By using fluid and thermodynamic techniques, the
   scuderi technology improves how an engine converts
   chemical energy to mechanical energy.
   In a conventional otto cycle engine,
    each cylinder performs four strokes
    per cycle: intake, compression,
    power, and exhaust. This means
    that two revolutions of the
    crankshaft are required for each
    power stroke. The Scuderi Engine
    divides these four strokes between
    two paired cylinders: one for
    intake/compression and another for
    power/exhaust.
How it works :
   The base Scuderi Engine is a split-cycle design
    that divides the four strokes of a conventional
    combustion cycle over two paired cylinders.
    one intake/compression cylinder and one
    power/exhaust cylinder.
    By firing after top-dead center, it produces
    highly efficient, cleaner combustion with one
    cylinder and compressed air in the other.

   Besides the improvements in efficiency and
    emissions, studies show that the Scuderi
    Engine is capable of producing more torque
    than conventional gasoline and diesel engines.
How does the air get from one
cylinder to the other :
   There is a short passageway connecting the
    cylinders.
   A conventional cam-actuated valve admits air
    to the combustion chamber, but a pressure
    activated disk type valve admits air into the
    passageway from the compression chamber
    and prevents it from leaking back onto the
    intake cylinder.
When and where is the fuel
injected:
   Fuel is injected directly into the cylinder
    just as the valve opens.
   The highly compressed air whooshes in
    so quickly and atomizes the injected
    fuel so thoroughly that the spark is fired
    to ignite it 11 to 15 degrees after TDC,
    even when running lean mixtures for
    increased efficiency.
         P-V curves :

In an internal combustion
engine, the two high-pressure
strokes of compression and
power consume and produce
energy.

The compression stroke is
negative work, or energy that
the engine expends to do
work on the gas.
The power stroke is positive
work, or energy that the
expanding gases of
combustion perform on the
engine to create mechanical
work.

The net energy produced by
the engine (its efficiency) is
the energy generated during
the power stroke less the
amount of energy consumed
by the compression stroke.
Second phase:


Why it is so exceptional?
Solving the thermal efficiency problem by firing ATDC.
High pressure and massive turbulence
Advantages of Scuderi split cycle design.
Disadvantages .
Conclusion .
      Why it is so exceptional?


The scuderi split-cycle
 engine solves both the
 breathing and thermal
 efficiency problems.
         Solving the thermal efficiency problem by
         firing after top dead center (ATDC).

o   Although considered bad
    practice in conventional engine
    design , firing ATDC in a split
    cycle arrangement eliminates the
    losses created by recompressing
    the gas.
o   The big issue was not how to
    solve the thermal efficiency
    problems of the split cycle
    engine, but rather how to fire
    ATDC.
High pressure and massive
turbulence
   In the Scuderi Engine, firing after top dead center is
    accomplished by using a combination of high
    pressure air in the transfer passage and high
    turbulence in the power cylinder.
   This high pressure air entering the power cylinder
    creates massive turbulence. The turbulence is
    further enhanced by keeping the valves open as long
    as possible during combustion .
   The result is very rapid atomization of the fuel/air
    mixture creating a fast flame speed or combustion
    rate faster than any previously obtained
Advantages of scuderi split
cycle engine.
   One of the biggest advantages of the Scuderi
    Split-Cycle Technology is design
    flexibility. Many features that require
    additional equipment or are just too difficult
    to implement in a conventional engine design
    are easily accomplished with a Scuderi Split-
    Cycle configuration. For example,
    supercharging can be added simply by
    increasing the diameter of the compression
    cylinder.
   Piston friction can be
    reduced by offsetting the
    compression and power
    cylinders.
   A Miller cycle can be
    achieved simply by
    increasing the length of the
    power cylinder.
    Disadvantages :
   Cool air never enters the power cylinder so heat
    would quickly build up causing lubrication oils to
    break down and components to fail.
   Water cooled cylinder walls would be required to
    resolve this.
   The crossover valve would experience high
    accelerations so valve train durability could be an
    issue.
   This very well might limit the rpm of the engine.
    Auto-ignition and /or flame propagation could occur
    in the crossover passage.
Conclusion:
   The scuderi split cycle engine is having thermal
    efficiency about 42.6%,which is far more better then
    conventional engine.
   It greatly reduces the wastage of fuel, which is most
    important thing to countries like India ,which is
    dependent on foreign countries for petroleum fuels.
    It reduces the burden on the imports customs.
   By using ATDC technique we can greatly reduce the
    losses created by re-compressing the gas. So , by
    using this scuderi split cycle engine, we can change
    the world of IC engines.

								
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