Superchargers and Types of superchargers:
In this article, we’ll explain what superchargers are, how they work and how they compare to turbochargers and the types of superchargers. Superchargers are basically air-compressors they shove more oxygen in your engine so it can make more power.
But do you know the turbo does the same work as superchargers do?
Turbos are another type of superchargers and originally known as turbosuperchargers. These days we use the name superchargers for engine air-compressor that aren’t turbos.
How are the superchargers invented?
Since the invention of the internal combustion engine( IC engine), The automotive engineers and racecar designers have been searching for new ways to boost engine power and make it more faster. The one way is to build a bigger engine to add more power. But bigger engines means more weight and more cost to build and maintain, and they are not always better.
Another way to add power is to make a normal-sized engine more efficient. This can be done by forcing more air into the combustion chamber.
More air means more fuel can be added, and more fuel means a bigger explosion and greater horsepower. Adding a supercharger is a great way to achieve forced air induction.
A Supercharger is a device. It increases the pressure of the air-fuel mixture from the carburettor before it enters the engine. The process of supplying the air-fuel mixture to the engine above the atmospheric pressure is called supercharging.
In an un-supercharged engine, the cylinder draws the mixture equal to its displacement volume.
Working of Superchargers
The air draws into an impeller, and centrifugal force throw it out in a compressor housing where the speed gets compressed in a high pressure instead. More air more gas and more power.
The pressure inside the cylinders is less than the atmospheric pressure during the suction stroke. But in a supercharged engine, the mixture is forced into the cylinder at a pressure higher than that of the atmosphere. Due to the higher pressure the density of the mixture increases, Therefore, its weight per stroke is increased for the same displacement volume. It increases the power output of the engine. The rate of fuel consumption is also increased.
- The engine should be able to take higher forces due to supercharging.
- Also, the fuel used should have higher anti-knock characteristics.
It should be noted that supercharging increases the weight or density of air-fuel mixture (in spark ignition engines) or air (in compression ignition engines) sucked into that cylinder during the suction stroke.
Supercharging decreases the knock tendencies in compression ignition engines. The take off by heavily loaded aircraft, the quicker rate of climb and high attitude performance can be achieved to the same extent by supercharging.
Objects of Supercharging:
- Supercharging reduces weight per horsepower of the engines as required in aero engines.
- To reduce the space occupied by the engine as necessitated in marine engines.
- To maintain the power of a reciprocating aircraft engine even at high altitudes where less oxygen is available for combustion.
- It used to improve the volumetric efficiency of the engine at high altitudes, as in aero engines, and at high speeds as in racing cars.
- To have better turbulence and thus ensures more complete combustion giving greater power and low specific fuel consumption.
Types of superchargers
There are three general types of superchargers :
- Centrifugal type.
- Vane type.
- Roots air-blower type.
Centrifugal Type Supercharger
it consists of an impeller which rotates at a very high speed, about 10,000 r.p.m. The air-fuel mixture enters the impeller at the centre. and after passing through the impeller and diffuser vanes goes out of the casing to the engine cylinder. due to the high speed of the impeller, the mixture forced into the cylinder at a high pressure.
Roots Air-Blower Type Supercharger
it consists of two rotors of the epicycloid shape. Each rotor is fixed to a shaft by a key. The two shafts are connected together by means of gears of equal size. Thus, the two rotors revolve at the same speed. The working action of such a supercharger is just like a gear pump so that the mixture at the outlet side is at a high pressure.
Vane Type Supercharger
It consists of a drum on which a number of vanes are mounted in such a manner that they can slide in or out against some force. So that all the time they are in contact with the inner surface of the supercharger body. The space between the body and the drum goes on decreasing from the inlet to the outlet side. Thus, the air-fuel mixture entrapped between any two vanes at the inlet goes on decreasing volume and increasing in pressure as it reaches the outlet.
The roots supercharger is simpler in construction and requires the least maintenance. It has a comparatively longer life. it works well even at lower speed ranges. Centrifugal type supercharger has poor working characteristics at lower speeds. the vane-type supercharger has the problem of wear of vane tips.
Some Pros and Cons of Superchargers
- By adding superchargers you’ll have good low rpm boosts.
- They are reliable and fairly inexpensive.
- Superchargers do not use engine oil so that’s the plus.
- You don’t have the heat issues that a turbocharger has so that’s that’s a good thing.
- the problem with the roots types of superchargers is it does not compress the air internally it does cradle of heat that’s one downside.
- All superchargers are powered by the engine rather than the exhaust gases. So in order to power the supercharger a little bit of engine power is used. So you’re going to have a loss just by having a supercharger on there.
- Superchargers have a high weight placement. So you’ve got your engine and then the supercharger is going to be placed on top.
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