【Daily Question】Theoretical Foundation 2019.7.14

2019-07-14View Original

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Multiple-choice question: An airflow flows through a Laval nozzle, resulting in a supersonic airflow at the outlet of the nozzle. If the pressure of the medium outside the nozzle exit is further reduced, the ideal flow rate of the nozzle will ( ). A. Increase B. Decrease C. Remain unchanged D. Be uncertain. Answer: C. For a Laval nozzle, when the initial conditions and the dimensions of the converging section are fixed, the pressure at the outlet section can be reduced below the critical pressure; however, the flow behavior before the minimum cross-sectional area does not change due to the presence of a diverging section, and the airflow reaches a critical state at that minimum cross-sectional area. Hint: The answer will be visible upon reply

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【Daily Question】Theoretical Foundation 2019.7.14

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