The objective of supercharging is to increase the charge density of the working medium (air or air-fuel mixture), by any means and with the help of a suitable system , before it enters the work cylinder, i.e., to precompress the charge.
What are the objectives of supercharging in SI engine and turbocharging?
The goal of the supercharging system is to deliver the required values of boost pressure at steady operating conditions, and to maintain or improve the full size engine response during acceleration (one of the most critical issues for downsized engines).
What is the purpose of a supercharger on an internal combustion engine?
supercharger, in piston-type internal-combustion engines, air compressor or blower used to increase the intake manifold pressure of the engine . Higher pressure increases the mass of air drawn into the cylinders by the pumping action of the pistons during each intake stroke.
What is the supercharging Mcq?
Supercharging increases the power output of the engine by . Solution: The method of supplying air or air-fuel mixture higher than the pressure at which the engine naturally aspirates, by means of a boosting device is called supercharger. ... The specific fuel consumption of the supercharged engines is more.
What is the purpose of supercharging the engine?
A supercharger is an air compressor that increases the pressure or density of air supplied to an internal combustion engine . This gives each intake cycle of the engine more oxygen, letting it burn more fuel and do more work, thus increasing power.
Which type of supercharger is best?
Here a centrifugal supercharger is the winner, operating with superior efficiency over a positive displacement supercharger – particularly at higher boost levels. This means that for the same boost pressure the intake air will be cooler with a centrifugal supercharger and we can expect more power.
How do you get supercharging?
Superchargers increase intake by compressing air above atmospheric pressure without creating a vacuum. This forces more air into the engine, providing a boost. With the additional air, more fuel can be added to the charge, and the power of the engine is increased.
What’s better a supercharger or a turbo?
Which Is Better: Turbo – or Supercharger? Each can be used to increase power, fuel economy, or both, and each has pros and cons. ... But superchargers can provide their boost almost instantly, whereas turbochargers typically suffer some response lag while the exhaust pressure required to spin the turbine builds.
What is the use of engine indicator?
An engine indicator is an instrument for graphically recording the pressure versus piston displacement through an engine stroke cycle . Engineers use the resulting diagram to check the design and performance of the engine. A mechanical indicator consists of a piston, spring, stylus, and recording system.
Why supercharger is not used in SI engine?
For petrol (SI) engines the main limitation of supercharging is knocking . As we know during supercharging pressure and temperature of air and fuel increases, which reduces ignition delay and results in engine knocking problems. ... For Diesel (CI) engines the main limitation of supercharging is because of thermal loading.
What are the advantages of supercharging?
- No Lag. A supercharger has no lag and consistent power delivery. ...
- Increased Horsepower. Adding a supercharger is a quick way to boost power to any engine.
- Low RPM Boost. ...
- Low Price. ...
- Less Efficient. ...
- Lacks Reliability. ...
- Future of the Supercharger.
Does a supercharger use more fuel?
Because a supercharger uses the engine’s own power to spin itself , it siphons power—more and more of it as engine revs climb. Supercharged engines tend to be less fuel efficient for this reason.
Does a supercharger decrease engine life?
Assuming a properly tuned system, proper oil change and engine maintenance, and similar driving, supercharging generally will not shorten the life of an engine , just as is the case with OEM turbocharging (with proper cooldown for turbochargers. A cooldown period after driving is not necessary with supercharging).
What is the supercharging process?
Supercharging is the process of supplying the intake of an engine with air at a density greater than the density of surrounding atmosphere so that each intake cycle of engine gets more oxygen , which burns more fuel thus generating more power .
What is the main objective of supercharging engine Mcq?
To reduce the mass of the engine per brake power . To reduce space occupied by engine. To increase the power output of engine.
How knocking can be reduced?
In spark ignition (SI) engines, the possibility of knocking can be reduced by decreasing compression ratio as a reduction in compression ratio will result in the generation of lower peak temperature. ... High inlet temp of the air-fuel mixture will increase knocking.
