Rarefied Flow Velocimetry - Machado, Danilo Almeida
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High-speed flows, such as supersonic and hypersonic flows, are crucial for aerospace technologies and the validation of fluid dynamics codes. This work characterizes the velocities of flows generated by an expansion chamber using three techniques: one intrusive, the Rapid Ionization Detector, and two optical, schlieren and a modified schlieren method combined with molecular iodine absorption.The Rapid Ionization Detector made it possible to study flows at pressures of 10^-6 mbar and speeds of 21 to 726 m/s. Using the characteristics method, flows with minimum temperatures of 29 K and Mach…mehr

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Produktbeschreibung
High-speed flows, such as supersonic and hypersonic flows, are crucial for aerospace technologies and the validation of fluid dynamics codes. This work characterizes the velocities of flows generated by an expansion chamber using three techniques: one intrusive, the Rapid Ionization Detector, and two optical, schlieren and a modified schlieren method combined with molecular iodine absorption.The Rapid Ionization Detector made it possible to study flows at pressures of 10^-6 mbar and speeds of 21 to 726 m/s. Using the characteristics method, flows with minimum temperatures of 29 K and Mach numbers of up to 12 were obtained. Schlieren velocimetry made it possible to visualize flows in voids of up to 200 mbar, with speeds of 5.2 to 66.5 m/s, temperatures of 297.6 to 300 K and a maximum Mach number of 0.2.The modified Schlieren method made it possible to visualize flows at pressures of up to 15 mbar, an order of magnitude lower than the conventional method, with speeds of 92 to 190 m/s, temperatures of 280.1 to 295.3 K and a maximum Mach number of 0.6.
Autorenporträt
Danilo is a researcher at USP's Polytechnic School, with experience in combustion and propulsion. He was a professor in the Brazilian Navy and a research assistant at DCTA's IEAv. He has a doctorate in Space Engineering and Technology from INPE, a master's degree in Space Science and Technology from ITA and a degree in Physics from UNESP.