MAE2_Lecture2

# MAE2_Lecture2 - Fundamentals and the Standard Atmosphere...

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Fundamentals and the Standard Atmosphere Fundamental Properties of a Gas Equation of State Altitude Definitions Hydrostatic Equation The Standard Atmosphere Other Altitude Definitions MAE 2 STS-117 (NASA Image EDO7-0137-13)

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2 MAE 2 Fundamental Quantities in Aerodynamics Pressure is the normal force per unit area exerted on a surface due to gas molecules impacting that surface. Typical units: N/m 2 , lb/ft 2 , atm The density of a gas is its mass per unit volume. Typical units: kg/m 3 , slug/ft 3 Temperature is a measure of the average kinetic energy of the particles in the gas. Typical units: K, o C, o R, o F p = lim dA 0 df dA p = pressure dF = force acting on dA dA = small area = lim dv 0 dm dv = density dm = massinside dv dv = small volume
3 MAE 2 Flow Fields The velocity of a flowing gas is the velocity of a small fluid element as it passes through a fixed point. Velocity is vector quanitity – it has a magnitude and a direction. A fluid particle in steady flow will trace a path (called a streamline ) in space. Pressure, density, temperature, and velocity are all point properties.

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MAE2_Lecture2 - Fundamentals and the Standard Atmosphere...

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