A Prediction of Water-Entry Cavity Shape

[+] Author and Article Information
H. I. Abelson

Department of Mechanical Engineering, Manhattan College, Riverdale, N. Y.

J. Basic Eng 93(4), 501-503 (Dec 01, 1971) (3 pages) doi:10.1115/1.3425291 History: Received June 15, 1970; Online October 27, 2010


A method is described for predicting the shape of the cavity formed when a projectile enters the water vertically from air, as a function of time. The method, developed by Birkhoff and based on a hydraulic flow model, has been shown to be applicable for entries of bluff, axisymmetric projectiles. A knowledge of the projectile weight, entry velocity, and cavity-running drag coefficient is required. Predicted and observed cavity shapes are compared for the entry of a sphere at very reduced pressure and the entry of a conical-nosed cylinder from normal air. Excellent agreement is observed over almost the entire cavity length.

Copyright © 1971 by ASME
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