Question
Download Solution PDFThe __________ is a device through which exhaust gases from an internal-combustion engine are passed to reduce the noise of the engine.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- A muffler, also called a silencer, device through which the exhaust gases from an internal-combustion engine are passed to attenuate (reduce) the airborne noise of the engine.
- To be efficient as a sound reducer, a muffler must decrease the velocity of the exhaust gases and either absorb sound waves or cancel them by interference with reflected waves coming from the same source.
- A typical sound-absorbing material used in a muffler is a thick layer of fine fibers; the fibers are caused to vibrate by the sound waves, thus converting the sound energy to heat.
- Mufflers that attenuate sound waves by interference are known as reactive mufflers. These devices generally separate the waves into two components that follow different paths and then come together again out of phase (out of step), thus canceling each other out and reducing the sound
Types of mufflers:
- Reverse flow muffler:
- Straight through muffler
- Baffle type
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