Flow Studies in Close-Coupled Ventral Nozzles for STOVL Aircraft

Format:

Conference/Event

Author/Creator:

McArdle, Jack G., author.

Conference Name:

Aerospace Atlantic Conference & Exposition (1990-04-23 : Dayton Oh, Ohio, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1990

Summary:

SUMMARYFlow in a generic ventral nozzle system was studied experimentally and analytically with the PARC3D computational fluid dynamics program (a full Navier-Stokes equations solver) in order to evaluate the program's ability to predict system performance and internal flow patterns. A generic model of a tailpipe with a rectangular ventral nozzle, about one-third of full size, was tested with unheated air at steady-state pressure ratios up to 4.0. The end of the tailpipe was closed to simulate a blocked exhaust nozzle. Measurements showed about 5-percent flow-turning loss and reasonable nozzle performance coefficients. The flow turned more than the designed 90°, causing an aftward axial component in the total thrust. Flow behavior into and through the ventral duct is discussed and illustrated with paint streak flow visualization photographs. PARC3D graphic images are shown for comparison with the experiment photographs. The program successfully predicted internal flow patterns; it also computed thrust and discharge coefficients within 1 percent of measured values

Notes:

Vendor supplied data

Publisher Number:

901033

Access Restriction:

Restricted for use by site license