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Fluid-structure interactions in compressible cavity flows

Journal Article · · Physics of Fluids
DOI:https://doi.org/10.1063/1.4922021· OSTI ID:1184573

Experiments were performed to understand the complex fluid-structure interactions that occur during aircraft internal store carriage. A cylindrical store was installed in a rectangular cavity having a length-to-depth ratio of 3.33 and a length-to-width ratio of 1. The Mach number ranged from 0.6 to 2.5 and the incoming boundary layer was turbulent. Fast-response pressure measurements provided aeroacoustic loading in the cavity, while triaxial accelerometers provided simultaneous store response. Despite occupying only 6% of the cavity volume, the store significantly altered the cavity acoustics. The store responded to the cavity flow at its natural structural frequencies, and it exhibited a directionally dependent response to cavity resonance. Specifically, cavity tones excited the store in the streamwise and wall-normal directions consistently, whereas a spanwise response was observed only occasionally. Also, the streamwise and wall-normal responses were attributed to the longitudinal pressure waves and shear layer vortices known to occur during cavity resonance. Although the spanwise response to cavity tones was limited, broadband pressure fluctuations resulted in significant spanwise accelerations at store natural frequencies. As a result, the largest vibrations occurred when a cavity tone matched a structural natural frequency, although energy was transferred more efficiently to natural frequencies having predominantly streamwise and wall-normal motions.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1184573
Report Number(s):
SAND--2014-19234J; 540805
Journal Information:
Physics of Fluids, Journal Name: Physics of Fluids Journal Issue: 6 Vol. 27; ISSN 1070-6631
Publisher:
American Institute of PhysicsCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Resonance dynamics in compressible cavity flows using time-resolved velocity and surface pressure fields journal October 2017
Effects of upstream pipe length on pipe-cavity jet noise journal October 2019
Fluid–Structure Interactions on a Tunable Store in Complex Cavity Flow journal July 2019
Complex Geometry Effects on Cavity Resonance journal January 2016
Response of a Store with Tunable Natural Frequencies in Compressible Cavity Flow journal August 2016
Spatial Distribution of Resonance in the Velocity Field for Transonic Flow over a Rectangular Cavity journal December 2017
Volumetric Velocimetry of Complex Geometry Effects on Transonic Flow over Cavities journal May 2019
Response of a Store with Tunable Natural Frequencies in Compressible Cavity Flow conference January 2015
Simultaneous PSP and surface deformation measurements for fluid-structure interactions in a shock tube conference June 2018

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