Lecture.4 - AE 1350 Lecture #4 PREVIOUSLY COVERED TOPICS...

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AE 1350 Lecture #4
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PREVIOUSLY COVERED TOPICS Preliminary Thoughts on Aerospace Design Specifications (“Specs”) and Standards System Integration Forces acting on an Aircraft The Nature of Aerodynamic Forces Lift and Drag Coefficients
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TOPICS TO BE COVERED Why should we study properties of atmosphere? Ideal Gas Law Variation of Temperature with Altitude Variation of Pressure with Altitude Variation of Density with Altitude Tables of Standard Atmosphere
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Why should we study Atmospheric Properties Engineers design flight vehicles, turbine engines and rockets that will operate at various altitudes. They can not design these unless the atmospheric characteristics are not known. For example, from last lecture, We can not design a vehicle that will operate satisfactorily and generate the required lift coefficient C L until we know the density of the atmosphere, ρ . S V L C L 2 2 1 = ρ
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What is a standard atmosphere? Weather conditions vary around the globe, from day to day. Taking all these variations into design is impractical. A standard atmosphere is therefore defined, that relates fight tests, wind tunnel tests and general airplane design to a common reference. This common reference is called a “standard” atmosphere.
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International Standard Atmosphere Standard Sea Level Conditions Pressure 101325 Pa 2116.7 lb f /ft 2 Density 1,225 Kg/m 3 0.002378 slug/ft 3 Temperature 15 o C or 288 K 59 o F or 518.4 o R
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Lecture.4 - AE 1350 Lecture #4 PREVIOUSLY COVERED TOPICS...

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