At a 13 inch radius from the APU exhaust, what is the approximate temperature and velocity?

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Study for the EAWS Phase III Boeing EA-18G Growler Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready to ace your exam!

Multiple Choice

At a 13 inch radius from the APU exhaust, what is the approximate temperature and velocity?

Explanation:
Understanding how an exhaust plume behaves as it moves away from the outlet helps you predict what you’ll encounter near the hardware. Right at a short distance like 13 inches, the plume is still hot and moving, but it has begun to mix with ambient air and expand. The temperature doesn’t stay at the jet’s opening level, and the gas loses some momentum as it entrains surrounding air. So you expect a hot but not blistering temperature and a decelerating flow. The best pick reflects that balance: roughly 300–310 degrees Fahrenheit with a velocity near 71 mph. The temperature range captures the cooling that happens due to mixing, while the velocity range reflects the plume slowing down as it entrains air and spreads outward. The other options either imply excessively high temperatures or velocities not consistent with a plume at that distance, or unrealistically low speeds, which don’t align with how APU exhaust behaves just a short distance from the outlet.

Understanding how an exhaust plume behaves as it moves away from the outlet helps you predict what you’ll encounter near the hardware. Right at a short distance like 13 inches, the plume is still hot and moving, but it has begun to mix with ambient air and expand. The temperature doesn’t stay at the jet’s opening level, and the gas loses some momentum as it entrains surrounding air. So you expect a hot but not blistering temperature and a decelerating flow.

The best pick reflects that balance: roughly 300–310 degrees Fahrenheit with a velocity near 71 mph. The temperature range captures the cooling that happens due to mixing, while the velocity range reflects the plume slowing down as it entrains air and spreads outward. The other options either imply excessively high temperatures or velocities not consistent with a plume at that distance, or unrealistically low speeds, which don’t align with how APU exhaust behaves just a short distance from the outlet.

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