3241 Lecture 5

3241 Lecture 5 - MAE 3241: AERODYNAMICS AND FLIGHT...

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MAE 3241: AERODYNAMICS AND FLIGHT MECHANICS Introduction to Streamlines, Stream Functions, and Velocity Potential January 28, 2011 Mechanical and Aerospace Engineering Department Florida Institute of Technology D. R. Kirk
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2 HARRIER INSTANTANEOUS STREAMLINES Streamline Set of points that form a line that is everywhere tangent to local velocity vector No flow across streamlines For a steady flow, moving fluid element traces out a fixed path in space Stream tube A set of streamlines that intersect a closed loop in space Water streamlines on F-16 model http://www.aerolab.com/water.html Harrier instantaneous streamlines http://ails.arc.nasa.gov/Images/InfoSys/AC91-0365-12.html
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3 DIFFERENCES BETWEEN φ and ψ 1. Flow field variables are found by: Differentiating φ in the same direction as velocities Differentiating ψ in direction normal to velocities 1. Potential function φ applies for irrotational flow only 2. Stream function ψ applies for rotational or irrotational flows
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3241 Lecture 5 - MAE 3241: AERODYNAMICS AND FLIGHT...

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