Introduction to Pressure_ Temperature_ and Density

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Introduction to Pressure_ Temperature_ and Density Powered By Docstoc
					Temperature, Pressure, and Density

   Danielle Hettmann and Chris Saleh
          SYST460 – Fall 2011
       Ambient temperature:
measure of the temperature of the
 air in the region surrounding the
               aircraft




                                          Static temperature:
                                     measure of the tempe
                                                             rature
                                     at the surface of the ai
                                                              rcraft
                      Ambient temperature varies with altitude:
        Below 36,089 feet: ambient temperature (˚R) = -3.566˚ * (altitude/1000)
              Above 36,089 feet: ambient temperature (˚R) = 389.988˚




                                                          rule of thumb: ambient
                                                        temperature drops 1˚ C for
         Delta ISA
                                                        every 1000 feet increase in
θ = (Tamb + ∆ISA) / (TSeaLevel +
           ∆ISA)
                                                                   altitude




                               Temperature Ratio
     Below 36,089 feet, Tamb/TSeaLevel = θ = 1 – (6.8753 X 10^-6) * pressure
                                       altitude
                   Above 36, 089 feet, Tamb/TSeaLevel = θ = 0.7519
       Ambient Pressure:
Measure of the pressure of the air
 in the region surrounding the
             aircraft




                                          Static Pressure:
                                     Measure of the pressu
                                                            re at
                                     the surface of the airc
                                                             raft
Pressure Ratio :

=Pamb / PSeaLevel




          Below 36,089 feet, the Ambient Pressure (lb/ft2)
            = (1 - ˚ * 6.88 X 10-6 * Pressure Altitude)5.26
          Above 36,089 feet, the Ambient Pressure (lb/ft2)
              = 0.223360 e ( (36.089 – Pressure Altitude)/20.8057)
         Ambient Density:
Measure of the density of the air in
the region surrounding the aircraft



                                       Density Ratio:

                                        = (Slugs/ft3)
                                       = amb / SeaLevel


        Boyles Law:
  Density (), pressure (),
     temperature (θ)
          =  / θ

				
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posted:4/14/2014
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