Accession Number:

ADA021987

Title:

The Performance Gains of Using Wide. Flush Boundary Layer Inlets on Water-Jet Propelled Craft

Descriptive Note:

Research and development rept.

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD PROPULSION AND AUXILIARY SYSTEMS DEPT

Personal Author(s):

• Purnell, John G.

Report Date:

1976-03-01

Pagination or Media Count:

46.0

Abstract:

The application of a wide, flush inlet on a water-jet-propelled craft was investigated to determine performance gains from using primarily low momentum boundary layer flow for producing the propulsion jet. A method of predicting the boundary layer conditions, the pump size, and the overall water- jet system performance is given. Improvement in overall system efficiency or propulsive coefficient of 10 to 12 over conventional flush inlets is predicted for a planing craft application.

Descriptors:

• *WATER JETS
• *MARINE PROPULSION
• *HYDROFOIL CRAFT
• *HULLS(MARINE)
• BOATS
• PLANING SURFACES
• AIR INTAKES
• JET PUMPS
• BOUNDARY LAYER
• EFFICIENCY
• PERFORMANCE(ENGINEERING)
• THICKNESS
• HYDRODYNAMICS

Subject Categories:

• Marine Engineering
• Fluid Mechanics
• Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE