Which factor most influences the completeness of combustion in a diesel engine?
The mixing of air and fuel
In a diesel engine, fuel is injected into hot compressed air very late in the compression stroke, leaving little time for it to mix before it burns.
For every fuel droplet to find enough oxygen and burn fully, the fuel must be finely atomised and thoroughly mixed with the air; poor mixing leaves unburnt fuel and produces smoke.
Therefore the quality of air and fuel mixing is the factor that most directly governs how complete the combustion is.
Octane number relates to petrol knock resistance (diesel is rated by cetane), and high-voltage sparks and the battery relate to spark-ignition engines, so none of these controls diesel combustion completeness.
Hence, the answer is The mixing of air and fuel.
Similar Questions
A technician needs to improve the efficiency of combustion in a petrol engine. Which adjustment related to the spark plug could help achieve this goal?
Which characteristic should an ideal diesel combustion chamber have?
Which of the following is a common cause of knocking noise in a diesel engine?
What does a higher octane rating in gasoline primarily indicate about the fuel?
Which engine problem is indicated by high carbon monoxide levels in the exhaust?
Which type of vehicle commonly uses Liquefied Petroleum Gas (LPG) as its primary fuel source?
A diesel engine provides excellent fuel economy and high thermal efficiency, but
combustion noise is relatively high. Which combustion chamber design is most likely
used?
A student hypothesizes that using ethanol-blended gasoline requires a different stoichiometric air–fuel ratio than pure gasoline. Which consideration supports this claim?
What is the primary purpose of gasoline’s volatility in a motor vehicle fuel system?
During which stroke of the engine cycle are nitrogen oxides produced in the highest
amount?
Important Questions from Fuels and Combustion
Theoretically, ignition in an engine should occur at:
In a Distributor less ignition system the distributor is replaced by:
In distributor-less ignition systems, ignition can be adjusted manually by:
What is the approximate ideal (stoichiometric) air-fuel ratio for complete combustion in a petrol (gasoline) engine?
A ballast resistor is used in which of the following systems?
