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Abstract
The UNC Charlotte hypersonic wind tunnel was designed and made by a team of engineering students in 2019. The wind tunnel is capable of holding 1500 PSI and sending air through a test chamber with viewing windows at Mach 3 and 5. The construction of the wind tunnel and confirmation of the wind tunnel’s performance were great feats achieved by the Hypersonic Senior Design team but further sensing capabilities on the wind tunnel are essential to the usefulness of the wind tunnel as a learning and research tool. A z-type schlieren system that uses refraction of light to view relative pressure differences through the center of the viewing window on the test chamber has been designed, fabricated and tested. This optical, qualitative measurement system will allow students and researchers to visualize boundary layer phenomena that occur around models under Mach 3 and 5 wind speeds. A linear actuated pressure sensing system that utilizes a pitot tube and pressure transmitters has been designed to be secured to the sidewall of the test chamber. This pressure sensing system sweeps a pitot tube back and forth through the center of the air flow in the test chamber providing continuous static and dynamic pressure readings during wind tunnel operation. The pressure sensing system provides the user with crucial information on the wind tunnel’s flow uniformity across the cross-section of the air flow as well as the true diameter of air flow traveling through the test chamber. The testing of the schlieren system has displayed phenomenal results as a stand-alone optical system and some room for improvement as an imaging system while the wind tunnel is operational. The testing with the pressure sensing system has shown quality measurement results, however the support system has proven to interrupt the flow through the test chamber. These sensing capabilities will, if nothing else, expose students to high-level wind tunnel observation providing them with experiences they can use in the real world; however, both can be used in the hypersonic field of research as they stand.