What is the function of the fuel manifold in a multi-burner combustor arrangement?

• A. To start the engine.
• B. To evenly distribute fuel to multiple burners and ensure uniform flame front and emission control.
• C. To cool the fuel.
• D. To store excess fuel.

Answer: (D)

The function being tested is how the fuel manifold distributes fuel evenly to all burners in a multi-burner arrangement. It takes a common fuel supply and splits it into calibrated, balanced flows so each burner receives the same amount of fuel at the same pressure. This even distribution creates a uniform flame front across the burners, promoting complete combustion, stable operation, and better emission control. If distribution is uneven, some burners run richer or leaner, causing flame instability, hotspots, and higher emissions.

Starting the engine, cooling the fuel, or storing excess fuel aren’t functions of the fuel manifold. The starter and ignition system handle starting, cooling isn’t the manifold’s role, and excess fuel is stored in tanks or sumps.