Theoretical and Experimental Velocities of Free-Falling Spheres in a Stratified Atmosphere.
NAVAL UNDERWATER SYSTEMS CENTER NEWPORT R I
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An important factor in the sound produced by an object impacting the water surface is the impact velocity of the object. A series of tests was conducted at the Atlantic Undersea Test and Evaluation Center AUTEC to determine the free-fall impact velocity of various size and weight spheres. The experimental data were then compared with the predictions of a mathematical model, which calculated impact velocities based on the drag coefficient, Reynolds number, drop altitude, and physical characteristics of the sphere and the atmosphere. After some modifications were made to the drag coefficient-versus-Reynolds number curve, good correlation was obtained between the experimental and calculated impact velocities.
- Fluid Mechanics