An Experimental Study of the Pressure in a Fast Bottom Beneath the Apex of an Overlying Fluid Wedge.
Abstract
The pressure profile in a fast bottom directly beneath the apex of a fluid wedge was investigated experimentally and compared with a computer model, which used saddle-point approximations based on image theory to predict the pressure under varying acoustical and geometrical parameters. Transducer fluid served as the fluid wedge overlying a water substrate. The fluid in the wedge was contained in an enclosed structure and was separated from the substrate by a thin Mylar membrane. The density ratio was 0.98 and the speed of sound ratio was 0.91. The experiment was conducted at a frequency of 88.2 kHz. Data were taken with the enclosure pressurized and nonpressurized for wedge angles of two through ten degrees, and with projector elevation angles at one-half and one-quarter the wedge angle. The experimental results agreed with theoretical predictions. Additionally, acceptable agreement was achieved between pressurized and nonpressurized conditions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1984
- Accession Number
- ADA153618
Entities
People
- M. K. Hedrick
Organizations
- Naval Postgraduate School