Andrew Bullock
Member
- Joined
- Oct 2, 2019
- Messages
- 7
- Reaction score
- 1
Hi,
Would any of you lovely folk be able to share some barometer based flight data with me where your rocket travelled supersonic?
I'm trying to understand the effects of supersonic speed on barometric altimeters.
I understand that the air behind the shock is likely to be subsonic and at higher pressure, therefore leading to a wrong altitude reading, but I'm curious to know quantitatively what this looks like.
Some possible scenarios to illustrate my ignorance:
1) Does the pressure behind the shock remain ~constant regardless of altitude at supersonic speeds? Presumably not, but if so, what pressure is it? How does it relate to speed and altitude?
2) Does the pressure become some arbitrary level?
3) Does the pressure directly correlate with true subsonic altitude, but some % different?
4) What happens when you slow down from super to subsonic, is the pressure transition instant or does it converge as the speed decreases?
5) Many more variations!
I'm hoping some graphs can illuminate me
Many thanks
Andrew
Would any of you lovely folk be able to share some barometer based flight data with me where your rocket travelled supersonic?
I'm trying to understand the effects of supersonic speed on barometric altimeters.
I understand that the air behind the shock is likely to be subsonic and at higher pressure, therefore leading to a wrong altitude reading, but I'm curious to know quantitatively what this looks like.
Some possible scenarios to illustrate my ignorance:
1) Does the pressure behind the shock remain ~constant regardless of altitude at supersonic speeds? Presumably not, but if so, what pressure is it? How does it relate to speed and altitude?
2) Does the pressure become some arbitrary level?
3) Does the pressure directly correlate with true subsonic altitude, but some % different?
4) What happens when you slow down from super to subsonic, is the pressure transition instant or does it converge as the speed decreases?
5) Many more variations!
I'm hoping some graphs can illuminate me
Many thanks
Andrew