Accession Number:

ADA010620

Title:

Analysis of Coanda Reattachment on Curved Surfaces.

Descriptive Note:

Interim technical rept. no. 1, 21 May-21 Dec 73,

Corporate Author:

DUVVURI RESEARCH ASSOCIATES CHULA VISTA CALIF

Personal Author(s):

• Duvvuri,Tirumalesa
• Park,Joel T.

Report Date:

1975-04-01

Pagination or Media Count:

52.0

Abstract:

Current developments in powered-lift STOL aircraft has renewed interest in jet reattachment to adjacent surfaces, the phenomenon also known as the Coanda effect. The experiments and theories on this subject over the past decade have been reviewed. Since reattachment distance on a curved surface has been neither measured nor predicted, an analysis was developed for the prediction of reattachment distance with offset, radius, and ventilation flowrate as parameters. A pair of non-linear equations have been solved on a computer with a minimization technique. Attachment distance as measured along the curved surface increases with offset, ventilation flowrate, and surface radius.

Descriptors:

• *Flow separation
• *Coanda effect
• *Convex bodies
• *Jet flow
• Curved profiles
• Short takeoff aircraft
• Mathematical models
• Equations of motion
• Computer applications

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE