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Model Rocket Aerodynamics

Model Rocket Aerodynamics Some Terminology Free stream the flow far away from a moving body Mach number fraction of the local speed of sound v free stream velocity (m/s) M free stream Mach number air density (kg/m3) q dynamic pressure (Pa) CD drag coefficient S planform area (m2) kinematic viscosity (kg/m-s) Re Reynolds number A frontal area (m2) Boundary layer thin region around a body where flow speeds up to free stream Angle of attack orientation of a body with respect to the free stream Aerodynamic Drag Drag coefficient determined analytically or experimentally Dynamic pressure required to find drag force q= 1/2 v 2 Drag force changes with q, but CD doesn t D=q C D A or D=q C D S Types of Drag Type Cause Skin friction drag Kinematic viscosity of air Pressure drag Body geometry Base drag Exhaust and wake Induced drag Left coefficient, aspect ratio, and efficiency Wave drag Supersonic speeds Aerodynamics & Stability Center of pressure the point through which the sum of all aerodyna

Implications on Model Rocketry • Aerodynamics is an crucial for performance in rocketry • Geometric and material decisions must take aero forces into consideration to achieve a successful mission • Much is intuitive (streamlined shapes, smooth contours), but advanced analysis can yield optimal designs

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