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Flow Studies in Close-Coupled Ventral Nozzles for STOVL Aircraft
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English
Abstract
Flow 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 5½-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.
Authors
Citation
McArdle, J. and Smith, C., "Flow Studies in Close-Coupled Ventral Nozzles for STOVL Aircraft," SAE Technical Paper 901033, 1990, https://doi.org/10.4271/901033.Also In
References
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- Smith C.F. McArdle J.G. “Analysis of the Internal Flow in a Ventral Nozzle for STOVL Aircraft,” AIAA Paper 90-1899 July 1990
- Wynosky T.A. Szyszko C.J. “V/STOL Deflector Aerodynamic Design Criteria,” AIAA Paper 73-1181 Nov. 1973
- Romine B.M. Meyer B.E. Jr. Re R.J. “A Static Investigation of Several STOVL Exhaust System Concepts,” AIAA Paper 89-2928 July 1989