How do altimeters react in high acceleration flow?

[user079622]

@boneh3ad
How will barometric altimeter react to horizontal pressure gradient when missile accelerate horizontally, in subsonic regime?
Will he change reading even if he fly at same altitude?

 

[anuttarasammyak]

Air pressure which barometric altimeter measures depends on position of the missile surface where altimeter is. Head air pressure is higher than the Tails. Higher altitude air pressure is lower than the lowers.

 

[user079622]

Air pressure which barometric altimeter measures depends on position of the missile surface where altimeter is. Head air pressure is higher than the Tails. Higher altitude air pressure is lower than the lowers.

Yes but static ports must be place in position where airflow velocity is same as freestream.

Here is static port at rocket.

 

[Flyboy]

Bit late to the party, but…

Static ports are not perfect. There’s always some disturbance from airflow around the airframe that needs to be accounted for. CFD modeling helps a great deal for that these days, but at least for larger jets, there will usually be a static port run out on a line, often from the tip of the vertical stabilizer, to provide clean air to reference against. The flight test program then compares the “clean” data against the data from the production static ports and then uses that comparison to create a calibration database.

Hopefully this helps.