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Temperature, Pressure, and Density

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 temperature at the surface of the aircraft.

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Temperature, Pressure, and Density

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  1. Temperature, Pressure, and Density Danielle Hettmann and Chris Saleh SYST460 – Fall 2011

  2. Ambient temperature: measure of the temperature of the air in the region surrounding the aircraft Static temperature: measure of the temperature at the surface of the aircraft

  3. 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 every 1000 feet increase in altitude Delta ISA θ = (Tamb + ∆ISA) / (TSeaLevel + ∆ISA) 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

  4. Ambient Pressure: Measure of the pressure of the air in the region surrounding the aircraft Static Pressure: Measure of the pressure at the surface of the aircraft

  5. 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)

  6. 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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