6 STROKE ENGINE
ABSTRACT
Ø Modern world thrives on heat energy used
in different forms.
Ø Automobile industries is ever-growing
industry.
Ø 95% of the automobile run on IC engines
which are powered by fossil fuels.
Ø Aim of thermal is to convert the heat
energy to mechanical energy.
Ø Efficiency of automobile is 30%.
Ø Paper describes the potential IC engine.
Ø To
meet tomorrows challenges.
Ø INTRODUCTION
Ø Otto cycle theoretically represents best
option for an IC engine cycle.
Ø Fuel energy is converted to heat at constant
volume , when fluid is at maximum compression.
Ø Two technical modifications in 4-stroke to
6-stroke.
Ø Six stroke engines captures the wasted heat
from the 4-stroke Otto cycle , creates
steam and cools engine by providing free power stroke.
Ø Developed by BRUCE CROWER and MALCOLM BEARE.
Fuel/air valves opens the piston moves down ,
which draws air and fuel into the chamber.
Valve closes as the piston moves back up ,
putting the air/fuel mixture under pressure.
Mixture is then ignited , causing a small
explosion.
Exhaust valves
opens the piston moves back up once again , pushing the by products of the fuel
explosion out of the chamber. This leaves the piston back in its starting
position ready for another cycle
BEARE
DUAL OPPOSED PISTON 6-_STROKE ENGINE
6-stroke
BEARE HEAD simply replaces the conventional 4- stroke engine cylinder
head.
The
BEARE HEAD utilizes an overhead short stroke Crank shaft and piston arrangement
which open and closes inlet and exhaust ports leading through the upper
cylinder liner.
The
technology combines a 4-stroke engine bottom end with an opposite piston in the
head working half the cylindrical rate of the bottom piston.
Head
piston works in a ported cylinder closely resembling 2-stroke, thus 4+2=6.
Engine
increases both torque and power output , better fuel economy , cleaner burning
with reduced emissions.
Amount
of power\torque generated by 35%.
WORKING
After the exhaust cycles out of the chamber,
rather than squirting more fuel and air into the chamber, his design injects
ordinary water. Inside the extremely hot chamber, the water immediately turns
to steam– expanding to 1600 times its volume– which forces the piston down for
a second power stroke. Another exhaust cycle pushes the steam out of the
chamber, and then the six-stroke cycle begins again.
It appears to be quite innovative, despite
the previous usage of water injection, which was to hold down combustion
temperatures to avoid melting the engine. The WWII airplanes that used the
water injection often used two stages of turbo charging, complete with an
intercooler between the stages to limit the temperature rise.
WORKING OF BEARE DUAL OPPOSED PISTON 6-STROKE
ENGINE
Combustion chamber volume : 100 cc
Main head:
Bore
: 115 mm
Stroke
: 96.3 mm
Swept volume
: 1000cc
Beare
head:
Bore : 75 mm
Stroke : 56.5 mm
Swept volume : 250 cc
PRESSURE- VOLUME FOR OTTO CYCLE
VOLUME-ANGLE 4-STROKE
PRESSURE- VOLUME FOR OTTO CYCLE
COMPARISON
B\W 4 AND 6-STROKE:
PERFORMANCE
AND ECONOMY
Beare Head 6 Stroke Engine is
thermodynamically more efficient, because the change in volume of the Beare
Engine Power Stroke is greater than the intake, compression, & exhaust
strokes.
The compression ratio of the Beare Dual
Piston Engine can be greatly increased because of the absence of hot spots in
the combustion chamber.
The Beare Engine’s rate of change in volume
during the critical combustion period is less than in a conventional 4stroke.
The absence of valves within the combustion
chamber allows greater Beare Engine design freedom.
A one-piece Beare Engine casting from
crankshaft to upper shaft becomes feasible. No head gasket needed, cheaper to
tool and produce.
ADVANTAGES
ADVANTAGES OF BEARE DUAL OPPOSED PISTON
6-STROKE ENGINE
The
net result is,
Power/torque increases of 35% (conservative)
Simpler and less expensive manufacturing and
tooling.
Reduction of cylinder head reciprocating
parts.
Lower maintenance costs due to less wearing
parts (Beare cylinder head)
Longer service intervals possible due to
lower operating temperatures recorded.
CONCLUSION
The world now thrives on fossil fuels, but it
is an exhaustible resource. We humans will surely move to an age where there
will be no fossil fuel left for consumption and we must try to postpone it by
using the available fossil fuel efficiently, so that we can prepare ourselves
to face that era.
The two engines discussed in the above paper
promises to use the available fossil fuel in an efficient manner. The engines
may have some flaws in it which can be eliminated as time progresses. We are
sure that these engines will rule the future.
REFERENCE
Thakink you by
@@@@@@ moses dhilip kumar
1 comment:
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