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All of the following parameters reduce knocking tendency in a compression ignition engine, except
- a)high inlet pressure and temperature
- b)higher compression ratio
- c)large engine size
- d)early injection of fuel
Correct answer is option 'D'. Can you explain this answer?
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All of the following parameters reduce knocking tendency in a compress...
The delay period increases with increase in injection advance which favour knocking tendency.
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All of the following parameters reduce knocking tendency in a compress...
Understanding Knocking in Compression Ignition Engines
Knocking, or diesel knock, occurs in compression ignition (CI) engines when fuel ignites prematurely, leading to noise and potential damage. Several parameters influence knocking tendency.
Factors Reducing Knocking Tendency:
- High Inlet Pressure and Temperature:
- Increasing inlet pressure and temperature enhances air-fuel mixture quality.
- This results in more complete combustion, diminishing the likelihood of premature ignition.
- Higher Compression Ratio:
- A higher compression ratio increases the thermal efficiency of the engine.
- It allows for more efficient combustion, thereby reducing the chances of knocking.
- Large Engine Size:
- Larger engines often operate at lower specific loads, which can help mitigate knocking.
- They can handle larger fuel quantities without the risk of early ignition.
Why Early Injection of Fuel Increases Knocking Tendency:
- Premature Ignition:
- Early fuel injection can lead to a situation where the fuel ignites before the piston reaches the optimal compression point.
- This can cause significant pressure fluctuations and increased noise, characteristic of knocking.
- Reduced Control over Combustion:
- Injecting fuel too early makes it challenging to control the combustion timing.
- This unpredictability can lead to inefficient combustion and increased knocking.
In conclusion, while options A, B, and C help reduce knocking tendency in CI engines, option D (early injection of fuel) exacerbates the problem, making it the correct answer to the question.
Knocking, or diesel knock, occurs in compression ignition (CI) engines when fuel ignites prematurely, leading to noise and potential damage. Several parameters influence knocking tendency.
Factors Reducing Knocking Tendency:
- High Inlet Pressure and Temperature:
- Increasing inlet pressure and temperature enhances air-fuel mixture quality.
- This results in more complete combustion, diminishing the likelihood of premature ignition.
- Higher Compression Ratio:
- A higher compression ratio increases the thermal efficiency of the engine.
- It allows for more efficient combustion, thereby reducing the chances of knocking.
- Large Engine Size:
- Larger engines often operate at lower specific loads, which can help mitigate knocking.
- They can handle larger fuel quantities without the risk of early ignition.
Why Early Injection of Fuel Increases Knocking Tendency:
- Premature Ignition:
- Early fuel injection can lead to a situation where the fuel ignites before the piston reaches the optimal compression point.
- This can cause significant pressure fluctuations and increased noise, characteristic of knocking.
- Reduced Control over Combustion:
- Injecting fuel too early makes it challenging to control the combustion timing.
- This unpredictability can lead to inefficient combustion and increased knocking.
In conclusion, while options A, B, and C help reduce knocking tendency in CI engines, option D (early injection of fuel) exacerbates the problem, making it the correct answer to the question.
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All of the following parameters reduce knocking tendency in a compression ignition engine, excepta)high inlet pressure and temperatureb)higher compression ratioc)large engine sized)early injection of fuelCorrect answer is option 'D'. Can you explain this answer?
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