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The stability of an air-maintained cavity behind a stationary object in flowing water

Swanson, W. M. and O'Neill, J. P. (1951) The stability of an air-maintained cavity behind a stationary object in flowing water. California Institute of Technology , Pasadena, CA.

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In studies made in the Free Surface Water Tunnel of a projectile running in an air-maintained cavity, the experimental relation between air entrainment rate and cavitation number was determined. The entrainment-rate coefficient CQ = Q/V0d^2, where Q is the air rate in cfs, V0 the free-stream velocity, and d the disk nose diameter, was plotted against cavitation parameter, K = (p0 - pk)/q0 where p0 is the free-stream pressure at the disk center line, pk the cavity pressure, and q0 the free-stream dynamic pressure. This experimental relationship for one single disc is shown for three different velocities in Fig. 1. The curves are similar in shape and each has a minimum value of entrainment coefficient which is designated by CQ^* at a value of K as designated as K^*.

Item Type:Report or Paper (Technical Report)
Additional Information:Navy Department, Office of Naval Research, Fluid Mechanics Branch, Contract N6onr-24424. Hydrodynamics Laboratory, California Institute of Technology, Memorandum Report No. M-24.3, 5 September 1951. J.P. O'Neill, Project Supervisor.
Group:Hydrodynamics Laboratory
Funding AgencyGrant Number
Office of Naval Research (ONR)N6onr-24424
Record Number:CaltechAUTHORS:HydroLabRptM-24.3
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9282
Deposited By: Archive Administrator
Deposited On:07 Dec 2007
Last Modified:02 Oct 2019 23:58

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