Question
Download Solution PDFWhich of the following components is responsible for atomising the fuel in a diesel engine?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFDiesel Engine
In a diesel engine, the component responsible for atomizing the fuel (i.e., breaking it into a fine mist) is the Fuel Injector.
In a diesel engine:
- Fuel is injected directly into the combustion chamber at high pressure.
- The fuel injector sprays the diesel fuel in the form of tiny droplets (atomization), ensuring better mixing with air and more efficient combustion.
- Atomization is critical for proper ignition since diesel engines rely on compression ignition, not spark plugs.
Fuel System
- In an engine, fuel reaches the cylinder bore through the following path: Fuel tank > Water separator > Feed pump > Filter > Injection pump > Injector nozzle > Cylinder
Turbocharger
- A turbocharger in a diesel engine is a device that increases power and efficiency by compressing intake air before it enters the combustion chamber.
- This compressed air, with a higher density of oxygen, allows the engine to burn more fuel, resulting in more power output and improved fuel economy.
- The turbocharger uses the energy from the exhaust gases to spin a turbine, which in turn drives a compressor that compresses the intake air.
Carburetor
- Diesel engines do not use carburetors. They operate on a compression ignition principle where air is compressed to high pressure and fuel is injected into the compressed air, causing it to ignite.
- Instead of a carburetor, diesel engines utilize fuel injection systems, often direct injection (DI) for better fuel efficiency and lower emissions.
Last updated on Jun 7, 2025
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