Mufflers and Types
In this article, you’ll learn about types of mufflers, working, design and more explained with PDF
What is Muffler?
The function of the muffler
The capacity of the muffler should be sufficiently large to permit the gases to expand to nearly atmospheric pressure before they are discharged into the air. Also, the muffler should not have any appreciable restriction, to flow that will raise back pressure excessively.
In some designs, the outer shell of the muffler is made oval in shape to permit adequate clearance with the ground. Many of the outer shells of mufflers are made of steel coated with lead-tin alloy or
Types of Mufflers
Following are the different types of mufflers used in vehicles:
- Baffle type muffler
- Wave cancellation type muffler
- Resonance type muffler
- Absorber type muffler
- Combined resonance and absorber type muffler
#1 Baffle Type Muffler
It consists of a number of baffles spot welded inside
There are many designs of the baffles used in the muffler. The image shows two types of such mufflers which have low efficiency. Due to the
#2 Wave Cancellation Type Muffler
In this type of muffler, the
Thus cancelling each other and reducing noise to zero theoretically. This is achieved if the lengths of the two paths differ by half the wavelengths. But this is not achieved practically, because the noise produced by exhaust gases is a combination of different frequencies at different engine speeds. However appreciable noise is reduced.
#3 Resonance Type Muffler
It consists of a number of Helmholtz resonators in series through which a pipe having access port passes.
Helmholtz is the name of a person who originated the idea of this type of muffler. The exhaust gases flow through this pipe. This resonator eliminates the fundamental and higher harmonics of the engine noise.
#4 Absorber Type Muffler
It consists of a perforated tube, around which a sound absorbing the material like fibreglass or steel wool is placed.
The exhaust gases pass through the perforated tube. the sound-absorbing material reduces the high-pressure fluctuation of the exhaust gases thus reducing the noise intensity. These mufflers may be either straight-through type or reverse flow type, as shown in the figure.
#5 Combined Resonance and Absorber Type Muffler
Sometimes, a resonance chamber is provided at one end or in the niddle of the straight through absorber type muffler, to reduce the pressure and noise still further.
In some designs, a resonance chamber is a separate unit called a resonance, which is connected in series to the muffler.
Read also: 9 Different Types of Clutches
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