46955074 a Presentation on Six Stroke Engines

8/22/2019 46955074 a Presentation on Six Stroke Engines

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A PRESENTATION ON SIX-

STROKE ENGINES


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SIX - STROKE ENGINES


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The six-stroke engine is a type ofinternal combustion engine based on

the four-strokeengine, but with additional complexity to make it more

efficient andreduceemissions. Two different types of six-strokeengine

have been developed since the 1990s:

1. In the first approach, theengine captures theheat lost from the four-stroke Otto cycle or Diesel cycle and uses it to power an additional power

andexhaust stroke of the piston in the same cylinder. Designs useeither

steam or air as the working fluid for the additional power stroke.

2. The second approach to the six-strokeengine uses a second opposed

piston in each cylinder that moves at half the cyclicalrate of the main piston, thus giving six piston movements per cycle.


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EXAMPLES OF THE TYPES OF ENGINES:

THOSE WHICH FOLLOW THE FIRST APPROACH:

Crower six-strokeengine

Bajulaz engine

Velozeta Six-strokeengine

THOSE WHICH FOLLOW SECOND APPROACH:

Beare Head

M4+2

Piston chargerengine.


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CROWER S SIX STROKEENGINE

In a six-strokeenginedeveloped in the U.S.by BruceCrower, freshwater is injected into the

cylinder after theexhauststroke, and is quicklyturned tosuperheated steam,which causes the water to

expand to 1600 times itsvolume and forces thepiston down for anadditional stroke.


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VELOZETA SIX STROKEENGINE

The first four strokes are

the same as a four stroke

internal combustion

engine . After theexhauststroke, instead of air/fuel

mixture ( as in case of

petrol engines) fresh air is

sucked

into the

cylinder

from the air filter, and

which is removedduring

the sixth stroke.


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BAZULAZ SIX STROKE ENGINE

The majority of the actual internal combustion engines, operatingon different cycles have one common feature, combustionoccurring in the cylinder after each compression, resulting in gasexpansion that acts directly on the piston (work) and limited to 180degrees of crankshaft angle.

According to its mechanical design, the six-stroke engine withexternal and internalcombustion and double flow is similar to theactual internal reciprocating combustion engine. However, itdifferentiates itselfentirely,due to its thermodynamiccycle and amodified cylinderhead with two supplementarychambers:a combustion and an air heating chamber, both independent from

the cylinder. Combustion, does not occur within the cylinder but inthe supplementary combustion chamber,does not act immediatelyon the piston, and it's duration is independent from the 180degrees of crankshaft rotation that occurs during theexpansion ofthe combustion gases (work).


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ENGINE DIAGRAM


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SIX STROKE ENGINE

EXPLANATION


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During 1st and 2nd stroke, the air the combustion chamber (6) can receive

injection of fuel and ignition is triggered.

1st stroke :Intake of pure air in cylinder(5).

Valve (1) is open.2nd stroke : Compression of pure air in the

heating chamber(7) .Valve (2) is open.


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During 3rd and4th stroke the temperature of the pure compressed air

in theheating chamber is raised sharply by heat exchange from

combustion chamber.

3rd stroke: power stroke (work) .Release ofcombustion gases in the cylinder. Valve(3) isopen.

4th stroke: exhaust of the combustion gases.

Valve (4) is open.


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5th stroke: Power stroke(work)

Release of pure gas in the cylinder.

6th stroke: Recompression of pure into the

combustion chamber.


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ADVANTAGES

Thermal efficiency reaching 50%. (30% for the actualinternal combustion engines)

Fuel consumption reduced by more than 40%.

Reduction of chemical, noise and thermal pollution.

Two expansions (work) through six strokes.

Direct injection and optimal fuel combustion at everyengine speed.

Multiple fuel,etc...


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APPLICATIONS

Motorboats (inboard and outboardengines) might offer abig outlet for this type ofengine. Their characteristics areperfectly suited to its use (economy, safety, simplification,andreduction in noise and pollution). Furthermore, the use

of fuels other than gasoline would greatly reduce therisksofexplosion.

Using non-fossil fuels of vegetable origin, natural gases andothers, in simple,robust engine, operating with a minimumof adjustments and non-pollutant, would offer greatadvantages when provided for motor-pumps, generatorsets, stationary engines,etc....intended for agriculture andindustry.

Many more applications may also beenvisaged.


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M4+2 SIX STROKEENGINE

The new conception of combustionengine is based on the combination oftwo engines. It makes use of both two-

and four-strokeengine.

BothThe cylinders of modules ofdoubleengine pistons have been joinedalong one common axis with cylinderhead- in the form of thering. Thepistons are moved withdifferent speedand with appropriate stagedisplacement. There are twocrankshafts, which are connected withspecial transmission. The four-stroke

crankshaft is rotated with a speed oftwice two-stroke crankshaft. Theengineis nameddouble pistons because of itsconstruction - double pistons andcrankshafts.


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PISTONCHARGERENGINE

In this engine, a "piston charger"replaces the valve system. Thepiston charger charges the maincylinder and simultaneouslyregulates the inlet and the outletaperture leading to no loss of airand fuel in theexhaust. In themain cylinder, combustion takesplaceevery turn as in a two-stroke engine and lubrication asin a four-stroke engine. Fuelinjection can take place in thepiston charger, in the gas transferchannel or in the combustionchamber.


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THANK YOU

46955074 a Presentation on Six Stroke Engines

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