Reaching Mach 1: Detecting Sonic Velocity in a Convergent Nozzle

AI Thread Summary
To determine when a convergent nozzle reaches Mach 1 at the exit, specific phenomena can be observed. One key indicator is the presence of a shock wave or a change in sound, often described as a sonic "boom" or a distinct change in airflow noise. Additionally, visual cues such as changes in airflow patterns or turbulence may be noticeable. The transition to sonic velocity can also be felt through vibrations or pressure changes in the surrounding environment. Understanding these indicators is crucial for accurately detecting when the nozzle reaches sonic velocity.
PhysicoRaj
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How do you know if a convergent nozzle has reached the exit velocity of mach 1? Suppose a convergent nozzle is connected to a blower, and gradually the blower air velocity is increased, would any phenomenon be helpful in detecting when the nozzle exit velocity is sonic, which can be heard or seen?
Thanks.
 
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Ya I have read De Laval nozzle on wiki. But it does not say how to know when the velocity at the throat will be sonic(mach 1).
To make it simpler, my question is " Is there any effect or phenomenon that occurs when the velocity of air at the throat of the CONVERGENT nozzle reaches mach 1, like a unique sound or something that can be seen, or felt?"
Thanks..
 
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