SUBMARINE MAST WAKE REDUCTION

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N/A
Agency Tracking Number: 8355
Amount: $49,846.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Timeline
Solicitation Year: N/A
Award Year: 1988
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
4 - 'a' Street, Burlington, MA, 01803
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 DAVID S GREELEY
 (617) 273-2400
Business Contact
Phone: () -
Research Institution
N/A
Abstract
A SUBMARINE MAST OR PERISCOPE WHICH PIERCES THE FREE SURFACE GENERATES A VISUALLY OBSERVABLE WAKE ON THE FREE SURFACE WHICH RENDERS THE SUBMARINE VULNERABLE TO DETECTION. IT IS PROPOSED TO INVESTIGATE THE FEASIBILITY OF REDUCING THIS WAKE BY A COMBINATION OF ACTIVE AND PASSIVE FLOW CONTROL DEVICES ATTACHED TO THE MAST OR PERISCOPE. A DEVICE SIMILAR TO A BULBOUS BOW ON SHIPS WILL BE USED TO REDUCE THE FREE SURFACE DISTURBANCES AROUND THE MAST, WHICH CONSIST OF WAVE HUMPS AND HOLLOWS, BREAKING WAVES WHICH ENTRAIN BUBBLES, A NECKLACK VORTEX, AND A ROOSTER TAIL AT HIGHER SPEEDS. THE 'BULBOUS BOW' DEVICE WILL BE DYNAMICALLY ADJUSTABLE TO PROVIDE NEAR-FIELD WAVE CANCELLATION AT VARIOUS SPEEDS, AND WITH THE MAST OR PERISCOPE SUBJECT TO VARYING EMERSION DUE TO SUBMARINE DEPTH FLUCTUATIONS AND OCEAN WAVES. THE TURBULENT WAKE BEHIND THE MAST WILL BE REDUCED BY FLUID BLOWING AT THE REAR OF THE MAST, TO REPLACE THE MOMENTUM LOST DUE TO THE DRAG OF THE MAST. THE BLOWING AT THE TRAILING EDGE WILL BE VARIED FROM SIDE TO SIDE TO COUNTERACT THE LIFT FLUCTUATIONS THAT WOULD OTHERWISE DEVELOP ON THE MAST DUE TO ANGLE OF ATTACK VARIATIONS RESULTING FROM OBLIQUE OCEAN WAVES.

* Information listed above is at the time of submission. *

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