Development of an improved temperature sensitive paint system for the Boeing/AFOSR Mach-6 Quiet Tunnel
Abstract
A two-color temperature sensitive paint (TSP) system was developed for the Boeing/AFOSR Mach-6 Quiet Tunnel (BAM6QT). TSP has previously been used in the BAM6QT for feature detection and quantitative heat transfer measurements. This new system, however, improves sensitivity and reduces noise. The sensitivity was increased by using Europium (III) Thenoyltrifluoroacetonate (EuTTA). EuTTA is favorable in this application due to its high temperature sensitivity, bright emission and pressure insensitivity. Noise was reduced through the use of a second (reference) color. Coumarin 540a was selected as the second luminophore. Calibrations were obtained using a single, color camera with a Bayer filtered CCD array. This is beneficial in that errors can be reduced from model motion, illumination instability, and temporal variation. Furthermore both color channels are obtained at a single location. Calibrations on the two-color paint were found to be repeatable. The paint had a maximum sensitivity of 1.68%/°C (an improvement of 60% over the current system). Simple impinging jet experiments were performed showing well defined temperature wake profiles. Using similar spatial resolution as the traditional system, the two-color paint showed a 22% reduction in noise compared with the traditional system. However, experiments that were performed in the BAM6QT, yielded results that were unacceptable. These limitations are most likely attributed to spectral transmittance issues with the windows and the increased noise level of the Nikon D200 camera in comparison with the thermoelectrically cooled pco.1600 camera.
Degree
M.S.A.A.
Advisors
Sullivan, Purdue University.
Subject Area
Aerospace engineering
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