Streamlining Aerodynamics Analyzing a moving body in a

Streamlining

Aerodynamics • Analyzing a moving body in a gas • Aero – Air • Dynamics - Moving

Streamlining • The process of reducing turbulence by altering design • To do this, change shape, material and surface features • Goal: To reduce Drag ▫ Drag is the force that acts against an object’s motion through a fluid ▫ Drag is friction in a fluid

Streamlined flow is LAMINAR FLOW!!!

How are these designed to MAXIMIZE or MINIMIZE DRAG?

Parachute

Train

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How to Streamline? • Use wind tunnels, water tanks and computer simulations for research • To ‘see’ laminar flow, use pressure sensitive beams, electronic sensors, drops of coloured water, small flags and plumes of smoke

To do: • Look at Figure 4 on Pg 284 • Read pg 284 and answer: ▫ What features are used to reduce drag: �In a car? �Shark? �Submarine?

Drag Coefficient (CD) • Lower CD, lower amount of drag ▫ Parachute - CD = 1. 35 ▫ Cars – 1930’s – CD = 0. 7 ▫ Cars – 2000’s – CD = 0. 4 • Look at Fig 8, Pg 286

What is this?

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Work • Pg 285 # 2 • Pg 286 # 7, 8, 9 • Pg 287 # 5