Accession Number:

ADA045788

Title:

Hydrodynamic Evaluation of the Sperry Projector Array Housing.

Descriptive Note:

Final rept.,

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP PERFORMANCE DEPT

Report Date:

1977-09-01

Pagination or Media Count:

41.0

Abstract:

The Sperry Projector Array housing and several modifications were evaluated using the Centers 36-Inch Variable pressure water tunnel from 4 to 16 knots and using a potential-flow computer program XYZ-PFP and the Centers CDC 6700 computer. It was conjectured that bubbles due to bubble sweepdown or air coming out of solution were accumulating in the separated region aft of the housing. This might account for the broadening of the aft projector beam pattern which had been determined from at-sea performance trials. It was shown that the original design had a rather large separated region which tended to accumulate bubbles. Suction, aft of the model, up to the rate of 7 galmin .00044 cu.m.s did not appear to change the size of the separated region. Rotating the array 45 deg around a vertical axis did help to reduce the size of the separated region but not sufficiently to eliminate it from the projector lens faces. A large housing was designed which should move the separated region beyond the region of the acoustic beam. Author

Subject Categories:

  • Acoustic Detection and Detectors
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE