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The tendency of knocking in CI engine reduced by
- a)high self-ignition temperature of fuel
- b)decrease in jacket water temperature
- c)injection of fuel just before TDC
- d)decrease in injection pressure
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The tendency of knocking in CI engine reduced bya)high self-ignition t...
Understanding Knocking in CI Engines
Knocking in Compression Ignition (CI) engines is an undesirable phenomenon that occurs when combustion happens too early or too violently, leading to a loss of efficiency and potential engine damage. The timing of fuel injection plays a crucial role in controlling this process.
Importance of Fuel Injection Timing
- Fuel Injection Just Before TDC: Injecting fuel just before the Top Dead Center (TDC) allows for better atomization and mixing with air. This timing ensures that the fuel ignites at the optimal moment, promoting a smoother and more controlled combustion process.
- Reduction in Premature Ignition: When fuel is injected too early, it can ignite before the piston reaches TDC due to the high temperature and pressure in the combustion chamber. This can lead to knocking. By delaying the injection to just before TDC, the risk of early ignition is significantly reduced.
Other Options Explained
- High Self-Ignition Temperature of Fuel: While fuels with a higher self-ignition temperature can reduce knocking, this property alone does not address the timing of combustion, which is critical in preventing knocking.
- Decrease in Jacket Water Temperature: Lowering the jacket water temperature may lead to increased engine temperatures overall, which can potentially worsen knocking rather than mitigate it.
- Decrease in Injection Pressure: Lowering the injection pressure can lead to poor atomization of the fuel, resulting in inefficient combustion and potentially increasing the likelihood of knocking.
Conclusion
In summary, the strategy of injecting fuel just before TDC is the most effective method for minimizing knocking in CI engines, as it optimizes combustion timing, enhances efficiency, and ensures engine longevity.
Knocking in Compression Ignition (CI) engines is an undesirable phenomenon that occurs when combustion happens too early or too violently, leading to a loss of efficiency and potential engine damage. The timing of fuel injection plays a crucial role in controlling this process.
Importance of Fuel Injection Timing
- Fuel Injection Just Before TDC: Injecting fuel just before the Top Dead Center (TDC) allows for better atomization and mixing with air. This timing ensures that the fuel ignites at the optimal moment, promoting a smoother and more controlled combustion process.
- Reduction in Premature Ignition: When fuel is injected too early, it can ignite before the piston reaches TDC due to the high temperature and pressure in the combustion chamber. This can lead to knocking. By delaying the injection to just before TDC, the risk of early ignition is significantly reduced.
Other Options Explained
- High Self-Ignition Temperature of Fuel: While fuels with a higher self-ignition temperature can reduce knocking, this property alone does not address the timing of combustion, which is critical in preventing knocking.
- Decrease in Jacket Water Temperature: Lowering the jacket water temperature may lead to increased engine temperatures overall, which can potentially worsen knocking rather than mitigate it.
- Decrease in Injection Pressure: Lowering the injection pressure can lead to poor atomization of the fuel, resulting in inefficient combustion and potentially increasing the likelihood of knocking.
Conclusion
In summary, the strategy of injecting fuel just before TDC is the most effective method for minimizing knocking in CI engines, as it optimizes combustion timing, enhances efficiency, and ensures engine longevity.
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The tendency of knocking in CI engine reduced bya)high self-ignition temperature of fuelb)decrease in jacket water temperaturec)injection of fuel just before TDCd)decrease in injection pressureCorrect answer is option 'C'. Can you explain this answer?
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