Flight at high altitude: Difference between revisions
From NPrize
Jump to navigationJump to search
(creating page) |
(→Flight at high altitude: some links and first interrogations) |
||
| Line 2: | Line 2: | ||
Some information is summarized in the main page already, in the [[Main_Page#The_aircraft|aircraft section]]. | Some information is summarized in the main page already, in the [[Main_Page#The_aircraft|aircraft section]]. | ||
==Gas properties and altitude== | |||
Density is used to calculate [http://en.wikipedia.org/wiki/Lift_(force) lift] of an wing and [http://en.wikipedia.org/wiki/Thrust thrust] of an engine amongst other. We need to know what air densities will be faced in order to design everything. | |||
Atmospheric density depends on pressure. [http://www.respirometry.org/index.php/look-up-tables/37-lookup-tables-cat/58-barometric-pressure-vs-altitude- This table] gives atmospheric pressure and temperature depending on altitude. We can see that a tenth of ground atmospheric pressure is met at around 16km altitude, and a hundredth of it at around 31km altitude. | |||
==Approaches overview== | ==Approaches overview== | ||
==High engine power at low air density== | ==High engine power at low air density== | ||
'''Is it possible to have a low total pressure ratio engine operating at subsonic inlet speeds?''' The MiG 25 has supersonic inlet, which allows him to have a significant pressure increase before the compressor actually gives energy to the flow. | |||
==High lift at low air density== | ==High lift at low air density== | ||
Revision as of 01:13, 9 December 2011
Flight at high altitude
Some information is summarized in the main page already, in the aircraft section.
Gas properties and altitude
Density is used to calculate lift of an wing and thrust of an engine amongst other. We need to know what air densities will be faced in order to design everything.
Atmospheric density depends on pressure. This table gives atmospheric pressure and temperature depending on altitude. We can see that a tenth of ground atmospheric pressure is met at around 16km altitude, and a hundredth of it at around 31km altitude.
Approaches overview
High engine power at low air density
Is it possible to have a low total pressure ratio engine operating at subsonic inlet speeds? The MiG 25 has supersonic inlet, which allows him to have a significant pressure increase before the compressor actually gives energy to the flow.
