Critical pressure condition at a nozzle throat Choose the correct statement about the steam velocity at the throat when the flow is critical (choked).
Mechanical Engineering
Steam Nozzles and Turbines
Difficulty: Easy
Choose an option
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AEqual to the velocity of sound
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BLess than the velocity of sound
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CMore than the velocity of sound
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DNone of these
Answer
Correct Answer: Equal to the velocity of sound
Explanation
Concept/Approach
- At the critical pressure ratio, the mass flow is maximum and the Mach number at the throat is 1 (sonic), so velocity equals local speed of sound.
Final AnswerEqual to the velocity of sound