Question

What is the purpose of a fuel injection system in the combustor?

• A. to accelerate the flow in the combustor
• B. to increase the stagnation pressure of the fuel-air mixture
• C. to ignite the fuel-air mixture
• D. to convert the bulk fuel into tiny droplets

Hint:

Effective atomization directly impacts fuel efficiency and emissions; thus, optimizing fuel injector design is crucial in aero engines and power plants.

Answer 1

The Correct Option is D

Step 1: Understanding Fuel Injection Systems.
Fuel injection systems in combustors, particularly in gas turbines, play a crucial role in atomizing the fuel, which means breaking down bulk liquid fuel into small droplets.
Step 2: Significance of Atomization.
This atomization process facilitates efficient mixing with the compressed air in the combustor, allowing for better combustion efficiency, more complete burning, and reduced emissions. The fine droplets ensure that the fuel has a larger surface area exposed to the oxidizer, enhancing the rate of chemical reaction and heat release.