Difference between a subsonic Pitot tube and supersonic one

AI Thread Summary
The discussion centers on the differences between subsonic and supersonic Pitot tubes, particularly regarding their functionality in varying flow regimes. Subsonic Pitot tubes measure stagnation pressure accurately, while supersonic Pitot tubes face challenges due to shock waves and non-isentropic flow, leading to potential inaccuracies in pressure measurements. The conversation highlights the importance of mathematical adjustments in Machmeters to account for these supersonic effects. There is uncertainty about whether the design of the Pitot tube itself changes significantly or if the adjustments are purely mathematical. Understanding these differences is crucial for accurate measurements in aerospace applications.
stephane
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Hi,

Please could you explain the difference between a subsonic Pitot tube and supersonic one

Thanks
 
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rcgldr said:
Looks like significant part of this is the math involved. Wiki article:

http://en.wikipedia.org/wiki/Machmeter
Thanks for your response but I ask about thé shock ahead pitot in supersonic an since thé flow is non isentropic so thé stagnation pressure is différente so thé value measured by pitot is false in supersonic régime no...?..
 
I'm not sure if the pitot tube is significantly different, or if a machmeter just compensates for supersonic issues with math.
 

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