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[attachment=4854]
Presented by:
ANUP DUTTA
Introduction
The power out put of an engine depends upon the amount of air inducted per unit time and the degree of utilization of this air , and the thermal efficiency of the engine.
Indicated engine Power
IP=P*L*A*n*K/60000 ……………..(1)
Where, IP= indicated power (kW)
P=indicated mean effective pressure(N/m2)
L=length of stroke
A= area of piston
n= no of power stroke, for 2-s engine-N and for 4-s engine N/2, N= rpm
K= No of cylinders
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Superchargers are generally the reason why tuned engines have
a distinct high pitched whine upon acceleration. The term supercharging technically refers to any pump that forces air into an engine.But the turbochargers are run by the pressure of the exhaust gases and the superchargers are run by the engines directly. As much as one third of the engine power is absorbed by the turbochargers. positive displacement superchargers are common . three main styles of superchargers are presently available in common use:
-Centrifugal superchargers-these are driven by the engine directly
-centrifugal turbochargers:these are driven by the exhaust gases
-Positive displacement pumps: these are depending on the Roots, Lysholm etc.
The thermal efficiency, or fraction of the fuel/ air energy that is converted to output power, is less
with a mechanically driven supercharger.The throttle response on turbocharged cars is as goog as the mechanical powered superchargers.
for more details, see these links:
http://scribddoc/42185031/Supercharging-Turbocharging
http://scribddoc/8441103/Supercharger-Versus-Turbocharger
http://scribddoc/29016581/supercharger-pdf
http://scribddoc/24894853/Turbochargers-vs-Superchargers-by-RJ-Performance
http://scribddoc/38742737/Supercharging
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