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Transcript of Meleo Tractors
classifications Superchargers Twin charging 1- Roots
3- Sliding vane
4-Scroll-type A) Positive displacement 1- Centrifugal Supercharger
2- Axial compressors
3- Pressure wave supercharger B) Dynamic compressors History IP=IPE X (F/A) X (CV) X (Ma)
IPE:Indicated Power Efficiency
CV:Calorofic Value of the fuel
Ma:mass flow rate of air
F/A:fuel to air ratio
Increasing in IP:Leads to increase in Ma & IPE
When density Increase:This allows a greater mass of the charge to be inducted into the the same volume. supercharger priciples !! 1) Increases the power of an engine.
2) A supercharger spinning at 50,000 RPM translates to a boost of about six to nine pounds per square inch(psi).
3) Increases the torque produced.
4) An efficiently working supercharger can achieve the same speed in one third time.
5) Necessary in aero-planes as they have less oxygen at high altitudes.
6) Ensures complete combustion of the fuel.
7) Reduces pollution to some extent. why superchargers ?? Thank You presented by According to Driving Method Compression Method Ahmed
Ezz Islam Gad Eman
Ayman B) Exhaust gas turbines (Turbocharger) Questions ? Mohamed
Fathy In 1860, Philander and Francis Marion Roots designed an air mover, for use in blast furnaces and other industrial applications.
in 1878, Dugald Clerk used it for the first two-stroke engine.
in 1902, Louis Renault patented a version of the centrifugal supercharger.
in1938 , GM developed GMC 6-71 supercharger.
Now we can find such companies as BBK Performance, Vortech, Roush, HKS, Blitz, Neuspeed, and Alpine Developments. Introduction
The method of increasing the inlet air density is called Supercharging.
“More fuel + More air = Bigger explosion = Greater horsepower”.
Supercharging can be done both for SI engines as well as in CI engines A) Mechanical
Belt (V-belt, Synchronous belt, Flat belt)
B) Exhaust gas turbines (Turbocharger)
C) Electric motor
D) Auxiliary Power Unit . A) Positive displacement:
3- Sliding vane
4- Scroll-type supercharger
B) Dynamic compressors :
1- Centrifugal Supercharger
2- Axial compressors
3- Pressure wave supercharger
1- Belt (V-belt, Synchronous belt, Flat belt)
2- Direct drive
3- Gear drive
4- Chain drive A) Mechanical D) Auxiliary Power Unit C) Electric motor Turbo vs supercharger Advantages of supercharger and turbocharger producing a maximum boost pressure between 0.33 to 1.0 bar , providing a proportionate increase in power.
Engines burn air and fuel at an ideal (stoichiometric) ratio of about 14.7:1, so if you burn more air, you must also burn more fuel.
useful at high altitudes: thinner air has less oxygen, reducing power by around 3% per 1,000 feet above sea level, but a supercharger can compensate for that loss, pressurizing the intake charge to something close to sea level pressure. Turbo vs supercharger Disadvantages of turbocharger and supercharger: 1- Cost and complexity
3- Parasitic losses
5- Turbo lag both a belt-driven supercharger and exhaust-driven turbocharger.
at low engine speeds:
boost was derived from the supercharger.
In the middle of the rev range:
boost was derived from both systems.
in the highest revs:
the system disconnected drive from the supercharger and isolated the associated ducting. Twin charging Conclusion Turbo-charging a tractor engine is an acceptable method of increasing its performance if carried out within manufacturers’ specifications.
Lower engine operating temperatures result which can be beneficial.
Since the engine lubricating oil is subjected to high temperatures as it passes through the turbocharger the correct oil must be used as specified for turbocharged engines.