Roots Blower for Supercharging of I.C. Engines

Supercharging is the process of increasing the pressure of air entering the combustion chamber of an internal combustion engine. This results in a higher power output from the engine. A compressor is used for supercharging, which compresses the air and forces it into the engine.

There are different types of compressors available for supercharging of I.C. engines, but the most commonly used compressor is the Roots Blower. Let's understand why.

What is a Roots Blower?

A Roots blower is a positive displacement type of compressor that uses a pair of meshing lobes to compress the air. It was invented by the American inventors Philander and Francis Roots in the 19th century. The lobes are shaped like figure-8 and are mounted on parallel shafts in a casing. As the lobes rotate, they trap the air between them and force it into the outlet.

Why Roots Blower is Suitable for Supercharging?

The Roots blower is suitable for supercharging of I.C. engines due to the following reasons:

1. High volumetric efficiency: The Roots blower has a high volumetric efficiency, which means it can move a large volume of air per unit time. This is essential for supercharging, as the engine needs a high volume of air for efficient combustion.

2. Constant pressure ratio: The Roots blower provides a constant pressure ratio, which means it can maintain a consistent air-fuel mixture in the engine. This is important for engine performance and efficiency.

3. Low heat generation: The Roots blower generates low heat during compression, which is important for engine reliability and durability.

4. Simple and robust design: The Roots blower has a simple and robust design, which makes it easy to manufacture and maintain. It is also less prone to wear and tear, which makes it a reliable choice for supercharging.

Conclusion

In conclusion, the Roots blower is the most commonly used compressor for supercharging of I.C. engines due to its high volumetric efficiency, constant pressure ratio, low heat generation, and simple and robust design.