Page 96 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

The working action of this type of supercharger is like that of a gear pump, so that

The mixture should be at high pressure on the outlet side.
• Vane Type Supercharger

It consists of a drum on which a number of vanes are mounted in such a way that they can slide in or out against a
spring force, so that at all times they are in contact with the internal surface of the supercharger body. The space
between the body and the drum decreases from inlet to outlet. Thus, the air-fuel mixture trapped between any
two vanes at the inlet goes
The volume decreases and the pressure increases as it reaches the outlet.
The Roots supercharger is simple in construction and requires minimal maintenance. It has a relatively long life.
It works well even in low speed range. Centrifugal type superchargers have poor operating characteristics at low
speeds. Vane type superchargers suffer from wear of vane tips.
The turbo charger sends compressed hot air to the inter cooler and it expands the heated air. The increase in
pressure from the turbocharger is the result of heating the air before it goes into the engine. To increase engine
power and get more air molecules into the cylinder.
Study about throttle body and intake manifold

Introduction of throttle body: Most of the spark-ignition internal combustion engines operate with an air-gasoline
ratio since throttle body controls airflow and fuel intake level. To control engine power and the flow pressure and
velocity, a throttle valve is used. The throttle valve’s main objective is to control air and gasoline mass flow, flow
pressure and flow velocity for changing the airflow ratio. For this case Computational Fluid Dynamics (CFD)
analysis can be used. Main function of a throttle body is to control the air flow into the engine. Throttle body
is mounted between the air cleaner and the engine. Throttle body has a plate to reduce the pressure of the
air flowing through throttle valve opening condition. When the throttle body is closed, all the air is not entering

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CITS : Automotive - Mechanic Diesel - Lesson 25 - 28 CITS : Automotive - Mechanic Diesel - Lesson 25 - 28