This document provides an overview of an air powered engine. It discusses the history of using compressed air to power engines. It then classifies air engines based on the number and position of cylinders. The key components of an air engine are described, including the compressor, PLC circuit, pulsed pressure control valve, cam, follower and air vessel. The working of the air engine is explained and compared to a two-stroke petrol engine. Finally, the advantages of lower emissions and costs, and limitations around refueling time and efficiency are presented.
As the world is hard pressed with the energy and fuel crises, compounded by pollution of all kinds, any technologies that bring out the solutions to this problem is considered as a bounty. In one of such new technologies, is the development of a new car called as compressed air car which does not require any of the known fuels like diesel, petrol, CNG, LPG, hydrogen etc. this works using only compressed air. This replaces all types of to-date known fuels and also permanently solves the problems of pollution as its exhaust is clean and cool measured practically as low as 5ºC. A proto type, a horizontal, single cylinder low speed engine was modified to run on compressed air. Since this engine runs only on high pressure compressed air, the exhaust of which is undoubtedly only air, making it a zero pollution engine. No heat is generated because there is no combustion of fuel, hence this car needs no cooling system and it result in reduced cost, weight, volume and vibration. Early cost analysis shows that it's very cost effective and the operational cost is ten times less than that of petrol or diesel. Experimental analysis were carried out on this modified car to find out its performance characteristics like brake power, mechanical efficiency, overall efficiency, air to Air ratio, volumetric efficiency, cost analysis etc. Though the efficiencies were low as the frictional forces were high for the proto designed engine, however the concept can be applied on a professionally designed engine to improve the car performance.
As the world is hard pressed with the energy and fuel crises, compounded by pollution of all kinds, any technologies that bring out the solutions to this problem is considered as a bounty. In one of such new technologies, is the development of a new car called as compressed air car which does not require any of the known fuels like diesel, petrol, CNG, LPG, hydrogen etc. this works using only compressed air. This replaces all types of to-date known fuels and also permanently solves the problems of pollution as its exhaust is clean and cool measured practically as low as 5ºC. A proto type, a horizontal, single cylinder low speed engine was modified to run on compressed air. Since this engine runs only on high pressure compressed air, the exhaust of which is undoubtedly only air, making it a zero pollution engine. No heat is generated because there is no combustion of fuel, hence this car needs no cooling system and it result in reduced cost, weight, volume and vibration. Early cost analysis shows that it's very cost effective and the operational cost is ten times less than that of petrol or diesel. Experimental analysis were carried out on this modified car to find out its performance characteristics like brake power, mechanical efficiency, overall efficiency, air to Air ratio, volumetric efficiency, cost analysis etc. Though the efficiencies were low as the frictional forces were high for the proto designed engine, however the concept can be applied on a professionally designed engine to improve the car performance.
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Cast iron is extensively used as the material for manufacturing disc brakes. This is much heavier and thus reduces initial acceleration and causes more fuel consumption. For reducing these effects, we use ceramic brakes.
air car is nothing but a air powered car which gets power of propulsion from the engine functions through compressed air technology. Here the fuel used is air.
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Cast iron is extensively used as the material for manufacturing disc brakes. This is much heavier and thus reduces initial acceleration and causes more fuel consumption. For reducing these effects, we use ceramic brakes.
air car is nothing but a air powered car which gets power of propulsion from the engine functions through compressed air technology. Here the fuel used is air.
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Air Compression and Electricity Generation by Using Speed Breaker with Rack A...IJMER
On roads, speed breakers provided to control the speed of traffic in rushed areas. The
potential energy in terms of weight of vehicle is loss on speed breaker can be utilized for useful
purposes. This paper describes the potential energy of such type of energy available on roads and its
utilization for useful work. The stages of development of a speed breaker device are described and the
mechanism to generate electricity using rack, pinion and speed increasing gear box and generator
and store compressed air with the help of piston cylinder compressor arrangement. Whenever the
vehicle is allowed to pass over the speed breaker dome, it gets pressed downwards. As the springs are
attached to the dome, they get compressed and the rack, which is attached to the bottom of the dome,
moves down in reciprocating motion. Since rack has teeth connected to pinion there is conversion of
reciprocating motion of rack in to rotary motion of pinion, but the two gears rotate in opposite
direction. So that shafts will rotate with certain RPM these shafts are connected through a belt drive
to the generators, which converts the mechanical energy into electrical energy. The rack is attached
to piston rod of cylinder so downward stroke of rack we can use for air compression in reservoir, with
help of piston cylinder arrangement. Simultaneously reciprocating piston cylinder arrangement
compresses the air and stores it in the reservoir. We can use the generated electricity and compressed
air for different purpose
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The aim is to design and to develop an air brake system based on exhaust gas is called “fabrication of air brake system using engine exhaust gas”. The main aim of this project is to reduce the workloads of the engine drive to operate the air compressor, because here the compressor is not operated by the engine drive.
Here we are placing a turbine in the path of exhaust from the engine. The turbine e is connected to a dynamo by means of coupling, which is used to generate power. Depending upon the airflow the turbine will start rotating, and then the dynamo will also starts to rotate. A dynamo is a device which is used to convert the kinetic energy into electrical energy. The generated power can be stored in the battery and then this electric power has loaded to the D.C compressor. The air compressor compresses the atmospheric air and it stored in the air tank and the air tank has pressure relief valve to control the pressure in the tank . The air tank supplies the compressed pneumatic power to the pneumatic actuator through solenoid valve to apply brake. The pneumatic actuator is a double acting cylinder which converts hydraulic energy into linear moti on.
Process Planning, Designing, Manufacturing and Fabrication is done and took the final analysis for the development of the project as it was or diploma final year project as an external all calculations and data is being mentioned in this
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3. CONTENTS:• What is an Air Powered Engine ?
• History of air engine.
• Classification of Air Engine.
• Various important parts of the engine.
(compressor, PLC circuit, Pulsed Pressure Control Valve,
Cam & Follower)
• Detail working of engine with compare to Two stroke petrol
engine.
• Advantages & Limitations.
4.
5. What is an Air Powered Engine ?
• An engine powered by Compressed air is known as
air powered engine.
• Compressed air cars are powered by motors driven
by compressed air, which is stored in a tank at high
pressure such as 30 Mpa (4500 psi or 310 bar).
Rather than driving engine pistons with an ignited
fuel-air mixture, compressed air cars use
the expansion of compressed air, in a similar
manner to the expansion of steam in a steam engine.
6.
7. History of air engine.
• Compressed air has been used since the 19th
century to power mines, locomotives and trains in
cities was previously the basis of
naval torpedo propulsion.
• In 1903, the Liquid Air Company located in London
England manufactured a number of compressed-air
and liquefied-air cars. The major problem with
these cars and all compressed-air cars is the lack of
torque produced by the "engines" and the cost of
compressing the air.
10. Classification Of Air Engine:
• Air engine is classified according to Position and
Number of Cylinders.
(a)Single Cylinder. Engine
has one cylinder and piston
connected to the crankshaft.
11. Opposed Cylinder Engine.
• Two banks of cylinders opposite each other on a
single crankshaft (a V engine with a 180 V). These
are common on small aircraft and some automobiles
with an even number of cylinders from two to eight
or more. These engines are often called flat engines.
12. Process description and discussion:
• To convert a conventional IC(four stroke petrol)
engine into an Air Powered one, few components
are to be replaced. First of all
1.Replace the spark plug with a pulsed pressure
control valve which can create required pressure.
2. Replace fuel tank with air vessel, as engine requires
pressurized air as input.
3. Replace cam with a modified cam. This is to be
done, so that both the inlet and outlet valves open and
close at the same time.
13.
14. Various important parts of the engine.
• The parts which are newly introduced to be used in
air engine are:
• PLC circuit.
• pulsed pressure control valve.
• air vessel(Compressed Air Tank made up of carbon
fiber)
• modified cam.
15.
16. PLC Circuit.
• A digitally operating electronic apparatus which uses a
programmable memory for the internal storage of
instructions for implementing specific functions such as
logic, sequencing, timing, counting, and arithmetic to
control, through digital or analog input/output modules,
various types of machines or processes.
• In essence, the programmable logic controller consists of
computer hardware, which is programmed to simulate the
operation of the individual logic and sequence elements that
might be contained in a bank of relays, timers, counters,
and other hard-wired components.
17.
18. Pulsed Pressure Control Valve.
• The pulse sensing valve is a valve offered to provide
emergency closure based upon a decompression
pulse in the hydraulic medium used in large
hydraulic piping systems.
• A fluid decompression pulse is generally initiated
during a severe loss of compression on a fluid
hydraulic system.
• This decompression pulse travels at the speed of
sound in the hydraulic fluid from the load interface
point to the supply source.
19.
20.
21. Air vessel(Compressed Air Tank).
• A pressure vessel is a closed container designed to
hold gases or liquids at a pressure substantially
different from the ambient pressure.
• The pressure differential is dangerous and fatal
accidents have occurred in the history of pressure
vessel development and operation.
• So in case of air engine the vessel is made up of
carbon fiber.
• Which has high tensile & compressive strength with
lighter in weight.
22.
23. Modified cam.
• Replacement cam with a modified cam. This is to be
done, so that both the inlet and outlet valves open
and close at the same time. Main advantage of doing
this is to achieve better scavenging system.
• Also this will result in conversion of 4 stroke engine
into 2 stroke air engine, which in turn gives us the
benefit of low mean effective pressure requirement
in addition to other operational benefits.
24.
25. About Carbon Fiber Used for Air Tank
• Carbonfiber,alternatively graphite fiber, carbon graphite or CF, is a
material consisting of fibers about 5–10 μm in diameter and composed
mostly of carbon atoms. The carbon atoms are bonded together in
crystals that are more or less aligned parallel to the long axis of the
fiber. The crystal alignment gives the fiber high strength-to-volume
ratio. Several thousand carbon fibers are bundled together to form
a tow, which may be used by itself or woven into a fabric.
• The properties of carbon fibers, such as high stiffness, high tensile
strength, low weight, high chemical resistance, high temperature
tolerance and low thermal expansion, make them very popular in
aerospace, civil engineering, military, and motorsports, along with
other competition sports. However, they are relatively expensive when
compared to similar fibers, such as glass fiber or plastic fibers.
26.
27. Other parts Air engine.
• Piston : piston is a component of reciprocating engines,
reciprocating pump, gas compressor and pneumatic cylinder,
among other similar mechanisms. It is the moving component
that is contained by a cylinder and is made gas-tight
by piston ring.
• In an engine, its purpose is to transfer force from expanding
gas in the cylinder to the crank shaft via a piston
rod and/or connecting rod. In a pump, the function is
reversed and force is transferred from the crankshaft to the
piston for the purpose of compressing or ejecting the fluid in
the cylinder. In some engines, the piston also acts as
a valve by covering and uncovering ports in the cylinder wall.
28.
29. Connecting Rod & Cylinder:
• Connecting Rod:
In a reciprocating piston engime, the connecting
rod or conrod connects the piston to the crank or crank shaft .
Together with the crank, they form a simple mechanism that
converts reciprocating motion into rotating motion.
• Cylinder:
A cylinder is the central working part of a reciprocating
engine or pump, the space in which a piston travels. Multiple
cylinders are commonly arranged side by side in a bank,
or engine blocks, which is typically
cast from aluminum, or cast iron before receiving precision
machine work.
30.
31. Crank Shaft:• Crank Shaft: The crankshaft, sometimes abbreviated
to crank, is the part of an engine that
translates reciprocating linear piston motion into rotation.
To convert the reciprocating motion into rotation, the
crankshaft has "crank throws" or “crank pins", additional
bearing surfaces whose axis is offset from that of the crank,
to which the "big ends" of the connecting rod from each
cylinder attach.
32.
33. Crank Case:• Crank case: In an internal combustion engine of
the reciprocating type, the crankcase is the housing
for the crankshaft. The enclosure forms the largest
cavity in the engine and is located below
the cylinders which in a multicylinder engine are
usually integrated into one or several cylinder
blocks.
34.
35. Working Details Of Air Engine with
comparing normal 4 stroke IC engine.
• Operation:
Initial torque is supplied from the DC exciter motor, and then the
engine operation starts.
Stage 1: When the piston is in the TDC, compressed air is injected
through the pulsed air firing valve, which pushes the piston to BDC.
• On comparing it with the working of normal SI 4 stroke engine:
“Stage 1” of the air engine comprises of the combined operation of
“Suction stage” and “Power stage” of the normal 4 stroke SI engine.
“Stage 2” of the air engine comprises of the combined operation of
the “Compression stage” and “Exhaust stage” of the normal 4 stroke
SI engine.
36.
37. Stage 2:
• Stage 2: Due to the motion of the engine and its
inertia, the piston moves back to TDC, pushing the
air out of the valves.
• The plunger of the pulsed firing valve is controlled
by a timing circuit which is specifically a PLC
programmed circuit. It supplies the electronic
signals by which the plunger moves so that it opens
and closes the pulsed firing valve.
38.
39. Benefits of Using Air Engine:
• Technical benefits:
The temperature of the engine while working will be
slightly less than the ambient temperature. Smooth
working of the engine due to very less wear and tear of
the components. There is no possibility of knocking.
No need of cooling systems and spark plugs or
complex fuel injection systems.
40. Economic benefits:
Economic benefits:
No use of expensive fossil fuels as the free air is
compressed and taken to use. For this reason people
can easily shift to the new technology. Compressors use
electricity for generating compressed air which is
relatively much cheaper and widespread. Smooth
working will lead to less wear & tear, so lesser
maintenance cost. cheaper in cost and maintenance and
it doesn’t cause any kind of harm to the environment.
Thus it is surely a futuristic mode of transport.
41. Limitations of Air engine:
• When air expands in the engine it cools dramatically
and must be heated to ambient temperature.
• This also leads to the necessity of completely
dehydrating the compressed air. pressure using a
heat exchanger.
• Refueling the compressed air container using a home
or low-end conventional air compressor may take as
long as 4 hours, though specialized equipment at
service stations may fill the tanks in only 3 minutes
42. Limitations of Air engine:
• The overall efficiency of a vehicle using compressed
air energy storage, using the above refueling
figures, is around 5-7%.For comparison, well to
wheel efficiency of a conventional internalcombustion drivetrain is about 14%,
• Early tests have demonstrated the limited storage
capacity of the tanks; the only published test of a
vehicle running on compressed air alone was
limited to a range of 7.22 km.