MAE2_Lecture4

# MAE2_Lecture4 - Basic Aerodynamics II Airspeed Measurement Supersonic Nozzles Viscous Flow Skin Friction Drag Boundary Layers Laminar Turbulent

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Basic Aerodynamics II Airspeed Measurement Supersonic Nozzles Viscous Flow Skin Friction Drag Boundary Layers Laminar Turbulent Transition Separation MAE 2

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2 MAE 2 Airspeed Measurement Bernoulli's equation is used for airspeed measurements in incompressible (low- speed) flow conditions. p 1 1 2 V 1 2 = p 2 1 2 V 2 2 closed end pressure gauge open end p 1 ,V 1 p 2 ,V 2 = 0 p 1 1 2 V 1 2 = p 2 p 1 2 V 1 2 = p q = p 0 V 1 = 2 p 0 p p 1 = p = static pressure p 2 = p 0 = total pressure q = 1 2 V 2 = dynamic pressure
3 MAE 2 Pressure Gauges Absolute and differential pressure gauges are readily available as a single sensor modules. Honeywell Absolute Pressure Sensor SCC30ASMT, 30 psia Honeywell Differential Pressure Sensor 26PCCFA6DT, 15 psi Timex Expedition WS4 with altimeter, barometer, compass, and thermometer

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4 MAE 2 True and Equivalent Airspeed The true airspeed assumes that the true air density is known. The equivalent airspeed replaces true air density with the standard sea level density. V true = 2 p 0 p V e = 2 p 0 p s s = standard sea level density
5 MAE 2 Subsonic Compressible Flow Commerical transports fly at high subsonic airspeeds, where compressibility must be

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## This note was uploaded on 01/05/2011 for the course MAE 2 taught by Professor Nomura,k during the Fall '08 term at UCSD.

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MAE2_Lecture4 - Basic Aerodynamics II Airspeed Measurement Supersonic Nozzles Viscous Flow Skin Friction Drag Boundary Layers Laminar Turbulent

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