10 November 2003 Application of laser-induced thermal acoustics to a high-lift configuration
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Abstract
Laser-Induced Thermal Acoustics (LITA) has been used to measure the flow field in the slat region of a two-dimensional, high-lift system in the NASA Langley Basic Aerodynamics Research Tunnel (BART). Unlike other point-wise, non-intrusive measurement techniques, LITA does not require the addition of molecular or particulate seed to the flow. This provides an opportunity to obtain additional insight and detailed flow-field information in complex flows where seeding may be insufficient or detection is problematic. Based on the successful use of LITA to measure the flow over a backward-facing step, the goal of this study was to further evaluate the technique by applying it to a more relevant and challenging flow field such as the slat wake on a high-lift system. Streamwise velocities were measured in the slat wake and over the main element at 11.3 degrees angle of attack and a freestream Mach Number of 0.17. The single-component LITA system is described and velocity profiles obtained using LITA are compared to profiles obtained using two-dimensional, Digital Particle Image Velocimetry (DPIV) and a steady, Reynolds-Averaged Navier-Stokes (RANS) flow solver for the same configuration. The normalized data show good agreement where the number of measurement locations had sufficient density to capture the pertinent flow phenomena.
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Luther N. Jenkins, Luther N. Jenkins, Roger C. Hart, Roger C. Hart, R. Jeffrey Balla, R. Jeffrey Balla, Gregory C. Herring, Gregory C. Herring, Mehdi R. Khorrami, Mehdi R. Khorrami, Meelan M. Choudhari, Meelan M. Choudhari, } "Application of laser-induced thermal acoustics to a high-lift configuration", Proc. SPIE 5191, Optical Diagnostics for Fluids, Solids, and Combustion II, (10 November 2003); doi: 10.1117/12.507732; https://doi.org/10.1117/12.507732
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