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Investigation of Drag Reduction by Boundary Layer Ingestion, Base Blowing, Base Ventilation and Free Surface Depression

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: N/A
Agency Tracking Number: 41299
Amount: $99,000.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Timeline
Solicitation Year: N/A
Award Year: 1998
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
841 Bishop Street, Suite 1880
Honolulu, HI 96813
United States
DUNS: N/A
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Robert Gornstein
 (808) 848-6309
Business Contact
Phone: () -
Research Institution
N/A
Abstract

This research effort will pursue four key methods of frictional drag reduction identified by Navatek, Ltd. under a prior CEROS MIDFOIL grant as supporting technologies to achieve a very high speed (70-100 knots) large (5,000-10,000 ton) ship. Under this grant, Navatek conceptualized a high-speed ship buoyantly and dynamically supported by high lift-to drag, high operating Froude number (F>1.2) lifting bodies operating in the presence of the free surface. This concept emerged from Navatek's research on SLICE and MIDFOIL technology, including large demonstrators. The four methods are 1) boundary layer ingestion to recover the momentum in the boundary layer; 2) base blowing to reduce the surface area of the submerged hull after bodies, eliminate control surface appendages and alter the pressure distribution over the body; 3) base venting to reduce the surface area of the strut afterbodies; 4) high lift-to-drag deltoid lifting body strut appendages to create a solitary wave to unwet strut appendages. Numerical analysis using validated CFD programs will develop concepts to achieve the highest lift-to-drag performance. The resultant designs can be tested at large model scale using Navatek-owned test craft, including the SLICE and MIDFOIL craft.

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

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