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Title: Influence of the Fluctuating Velocity Field on the Surface Pressures in a Jet/Fin Interaction

Abstract

The mechanism by which aerodynamic effects of jet/fin interaction arise from the flow structure of a jet in crossflow is explored using particle image velocimetry measurements of the crossplane velocity field as it impinges on a downstream fin instrumented with high-frequency pressure sensors. A Mach 3.7 jet issues into a Mach 0.8 crossflow from either a normal or inclined nozzle, and three lateral fin locations are tested. Conditional ensemble-averaged velocity fields are generated based upon the simultaneous pressure condition. Additional analysis relates instantaneous velocity vectors to pressure fluctuations. The pressure differential across the fin is driven by variations in the spanwise velocity component, which substitutes for the induced angle of attack on the fin. Pressure changes at the fin tip are strongly related to fluctuations in the streamwise velocity deficit, wherein lower pressure is associated with higher velocity and vice versa. The normal nozzle produces a counter-rotating vortex pair that passes above the fin, and pressure fluctuations are principally driven by the wall horseshoe vortex and the jet wake deficit. In conclusion, the inclined nozzle produces a vortex pair that impinges the fin and yields stronger pressure fluctuations driven more directly by turbulence originating from the jet mixing.

Authors:
 [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1459987
Report Number(s):
SAND-2018-4228J
Journal ID: ISSN 0022-4650; 662703; TRN: US1901829
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Spacecraft and Rockets
Additional Journal Information:
Journal Volume: 0; Journal Issue: 0; Journal ID: ISSN 0022-4650
Publisher:
AIAA
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Beresh, Steven J., Henfling, John F., Spillers, Russell Wayne, and Pruett, Brian Owen Matthew. Influence of the Fluctuating Velocity Field on the Surface Pressures in a Jet/Fin Interaction. United States: N. p., 2018. Web. doi:10.2514/1.A34214.
Beresh, Steven J., Henfling, John F., Spillers, Russell Wayne, & Pruett, Brian Owen Matthew. Influence of the Fluctuating Velocity Field on the Surface Pressures in a Jet/Fin Interaction. United States. doi:10.2514/1.A34214.
Beresh, Steven J., Henfling, John F., Spillers, Russell Wayne, and Pruett, Brian Owen Matthew. Thu . "Influence of the Fluctuating Velocity Field on the Surface Pressures in a Jet/Fin Interaction". United States. doi:10.2514/1.A34214. https://www.osti.gov/servlets/purl/1459987.
@article{osti_1459987,
title = {Influence of the Fluctuating Velocity Field on the Surface Pressures in a Jet/Fin Interaction},
author = {Beresh, Steven J. and Henfling, John F. and Spillers, Russell Wayne and Pruett, Brian Owen Matthew},
abstractNote = {The mechanism by which aerodynamic effects of jet/fin interaction arise from the flow structure of a jet in crossflow is explored using particle image velocimetry measurements of the crossplane velocity field as it impinges on a downstream fin instrumented with high-frequency pressure sensors. A Mach 3.7 jet issues into a Mach 0.8 crossflow from either a normal or inclined nozzle, and three lateral fin locations are tested. Conditional ensemble-averaged velocity fields are generated based upon the simultaneous pressure condition. Additional analysis relates instantaneous velocity vectors to pressure fluctuations. The pressure differential across the fin is driven by variations in the spanwise velocity component, which substitutes for the induced angle of attack on the fin. Pressure changes at the fin tip are strongly related to fluctuations in the streamwise velocity deficit, wherein lower pressure is associated with higher velocity and vice versa. The normal nozzle produces a counter-rotating vortex pair that passes above the fin, and pressure fluctuations are principally driven by the wall horseshoe vortex and the jet wake deficit. In conclusion, the inclined nozzle produces a vortex pair that impinges the fin and yields stronger pressure fluctuations driven more directly by turbulence originating from the jet mixing.},
doi = {10.2514/1.A34214},
journal = {Journal of Spacecraft and Rockets},
number = 0,
volume = 0,
place = {United States},
year = {2018},
month = {6}
}

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