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Two-dimensional Supersonic Thrust Vectoring Using Staggered Ramps

[+] Author and Article Information
Carlos F. Montes

M.S. Mechanical and Aerospace Engineering, Department of Mechanical and Aerospace Engineering, UC Davis 3401 Hillsborough Drive, APT 9, Concord, CA 94520
cfmontes@ucdavis.edu

Roger L. Davis

Professor, Department of Mechanical and Aerospace Engineering, UC Davis One Shields Ave., 2132 Bainer Hall, Davis, CA 95616
rogerdavis@ucdavis.edu

1Corresponding author.

ASME doi:10.1115/1.4035848 History: Received October 07, 2016; Revised December 29, 2016

Abstract

The thrust vectoring performance of a novel nozzle mechanism was numerically investigated. The nozzle was designed for supersonic, air-breathing engines using published engine data, isentropic relationships, and piecewise quartic splines. The mechanism utilizes two staggered, adjustable ramps. A baseline inviscid numerical simulation without ramps verified the nozzle design by comparing the results to analytical data. Nine ramp configurations were analyzed under steady-state turbulent viscous conditions, using two sets of inlet parameters corresponding to inlet conditions with and without an afterburner. The realizable k-e model was used to model the turbulence field. Area-weighted integrals of the exit flow showed superior flow deflection with the non-afterburning inlet flow parameters. Calculations of the mean flow deflection angles showed that the flow can be deflected as much as 30° in a given direction with the largest ramp length and angle values. The smallest ramp length (less than 5% of the nozzle length) demonstrated as much as 21° in flow deflection.

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