Engine Gas Turbines (Supplementary) USCG Question #29 (Set 1)

In the marine gas turbine engine shown in the illustration, the purpose of the COWL and diffuser assembly installed in the combustor is to provide __________. Illustration GT-0009

USCG Exam Illustration GT-0009
USCG Examination Diagram: Illustration GT-0009
Official USCG Answer & Rule Citation

Correct Answer: Option C — uniform air flow

The cowl and diffuser assembly in a combustor is engineered to manage the velocity and pressure of incoming air. By diffusing the high-velocity compressor discharge air, it ensures uniform airflow distribution into the combustion zone, which is critical for stable flame propagation and consistent thermal performance.

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