caa a22 4500 606197079 CHVBK 20210128100927.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00348-014-1887-1 doi (NATIONALLICENCE)springer-10.1007/s00348-014-1887-1 Flow quality experiment in a tandem nozzle wind tunnel at Mach 3 [Elektronische Daten] [Jie Wu, Pradip Zamre, Rolf Radespiel] In this study, the disturbance characterization and flow quality improvement of a newly designed Tandem Nozzle Mach 3 Wind Tunnel are presented. Firstly, a combined modal analysis is conducted to characterize the freestream disturbances with initial set-up of the settling chamber by using a Pitot probe and a hot-wire anemometry. Then, disturbance reduction in the supersonic wind tunnel is investigated by inserting various damping materials into the settling chamber, while a Pitot probe instrumented with Kulite sensor is employed to monitor the variation of the Pitot pressure fluctuation in the test section. Eventually, an optimized configuration of the settling chamber is determined by a combination of certain damping materials. Afterward, the freestream disturbances are re-characterized with the optimized set-up of the settling chamber, and the disturbance level is found to be significantly reduced. Through this study, valuable experience has been acquired for the disturbance reduction in tandem nozzle type supersonic wind tunnel for the first time, which enhances the feasibility of extending the operation range of conventional hypersonic Ludwieg tubes. Springer-Verlag Berlin Heidelberg, 2015 Wu Jie Institute of Fluid Mechanics, TU-Braunschweig, Braunschweig, Germany aut Zamre Pradip Institute of Fluid Mechanics, TU-Braunschweig, Braunschweig, Germany aut Radespiel Rolf Institute of Fluid Mechanics, TU-Braunschweig, Braunschweig, Germany aut Experiments in Fluids Springer Berlin Heidelberg 56/1(2015-01-01), 1-18 0723-4864 56:1<1 2015 56 348 https://doi.org/10.1007/s00348-014-1887-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-014-1887-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wu Jie Institute of Fluid Mechanics, TU-Braunschweig, Braunschweig, Germany aut NATIONALLICENCE 700 1- Zamre Pradip Institute of Fluid Mechanics, TU-Braunschweig, Braunschweig, Germany aut NATIONALLICENCE 700 1- Radespiel Rolf Institute of Fluid Mechanics, TU-Braunschweig, Braunschweig, Germany aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/1(2015-01-01), 1-18 0723-4864 56:1<1 2015 56 348