As we have discussed what exactly Knocking or Detonation is, it's quiet obvious that this phenomenon is of no use. Instead Detonation or Knocking has various harmful effects on IC Engine. Lets see them now.
Mechanical Damage:
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| Damaged Piston |
- A very high rapid pressure rise and subsequent waves of large amplitude causes high rate of wear inside engine cylinder.
- Erosion of piston crown in a similar manner to that of marine propeller blades by cavitation.
- Pitting at cylinder head and valves.
As large heavy duty have high noise level which makes it hard to detect Detonation or Knocking. So, corrective measures cannot be taken to avoid it which results in complete damage of piston.
Heat Transfer:
- Increase in rate of heat transfer to the combustion chamber walls can be observed due to Knocking or Detonation.
- Removal of protective layer of inactive stagnant gas due to the pressure waves. which causes high rate of heat transfer through cylinder walls.
- Due to rapid completion of combustion temperature inside Detonation engine is approx. 150℃ more than the non detonation engine.
Carbon Deposits:
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| Intake valve with carbon deposits vs without |
Detonation or Knocking results in high rate of carbon deposits and inefficient fuel combustion. These carbon particles damages inner lining of cylinder and when exhausted out from cylinder cause environment pollution.
Power output and efficiency:
Both power output and efficiency decreases because of Knocking or Detonation. This mainly happens because of increase in heat transfer rate.
Noise and Roughness:
Engine runs rough due to Knocking or Detonation because of the development of the pressure waves which vibrates back and forth across cylinder. Presence of vibratory motion causes crankshaft vibrations and rough motion.
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