Unsteady characteristics of a slat-cove flow field

Kyle A. Pascioni and Louis N. Cattafesta
Phys. Rev. Fluids 3, 034607 – Published 29 March 2018

Abstract

The leading-edge slat of a multielement wing is a significant contributor to the acoustic signature of an aircraft during the approach phase of the flight path. An experimental study of the two-dimensional 30P30N geometry is undertaken to further understand the flow physics and specific noise source mechanisms. The mean statistics from particle image velocimetry (PIV) shows the differences in the flow field with angle of attack, including the interaction between the cove and trailing-edge flow. Phase-locked PIV successfully links narrow-band peaks found in the surface pressure spectrum to shear layer instabilities and also reveals that a bulk cove oscillation at a Strouhal number based on a slat chord of 0.15 exists, indicative of shear layer flapping. Unsteady surface pressure measurements are documented and used to estimate spanwise coherence length scales. A narrow-band frequency prediction scheme is also tested and found to agree well with the data. Furthermore, higher-order spectral analysis suggests that nonlinear effects cause additional peaks to arise in the power spectrum, particularly at low angles of attack.

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  • Received 16 June 2017

DOI:https://doi.org/10.1103/PhysRevFluids.3.034607

©2018 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

Kyle A. Pascioni* and Louis N. Cattafesta

  • Florida Center for Advanced Aero-Propulsion, Florida State University, Tallahassee, Florida 32310, USA

  • *kyle.pascioni@nianet.org, currently at National Institute of Aerospace, 100 Exploration Way, Hampton, VA 23666, USA.

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Issue

Vol. 3, Iss. 3 — March 2018

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