Mach 1.3 wind tunnel development for acetone planar laser-induced fluorescence based density measurements of conical flow

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Date

2020-12-04

Authors

Shibata, Ryunosuke

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Abstract

A Mach 1.3 wind tunnel was designed and developed for experimental use with acetone planar laser-induced fluorescence (PLIF) based density measurements of a conical shock wave. The focus of this thesis is on the development on the wind tunnel, and not on the PLIF measurements. The nominal Mach 1.3 wind tunnel was based on an existing Mach 1.8 direct-connect isolator tunnel. A new nozzle and test section were fabricated and installed. The size of the test section was 9.35 inches (237.5 mm) long by 4.00 inches (101.6 mm) wide by 1.50 inches (38.1 mm) high. A series of Schlieren imaging tests was conducted with a cone mode installed. In its original configuration, the flow choked near a static model, which prevented the tunnel from starting. A new apparatus was then designed to allow the model to be injected into the flow once started. Injection showed some promise, but even at maximum plenum pressure of approximately 80 psi (551.6 KPa) the normal shock wave had only managed to reach the tip of the cone before unstarting. As a final configuration change, the test section was removed, and the cone model was installed with the tip at the plane of the nozzle exit. The cone was instrumented with two pressure taps, which were connected to two Kulite pressure transducers. The ratio of the total and cone surface pressures was used to infer the freestream Mach number. When the nozzle was operated near a perfectly expanded condition, which occurred for a total pressure of 39.6 psi (273.0 kPa), the average Mach number was calculated to be 1.306 ± 0.005, which is close to the design Mach number of Mach 1.32. A lower-than-design exit Mach number is expected owing to boundary layer growth. The resulting conical flow is believed to be sufficiently well characterized to serve as calibration source for acetone PLIF density measurements to be conducted in future work

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