… to mitigate risk from valve performance. Unlike some fast valve Ludwieg tubes, the AFRL
Ludwieg tube has no requirement for a fast-closing valve. The driver tube is simply recharged …

… Roger Kimmel of AFRL stated that his requirements for a Ludwieg tube included, “to do
transition and heat transfer measurements on 3D configurations, but there is also interest here …

… borrows from the design employed by AFRL where a folded driver tube is used to conserve
… AFRL Ludwieg Tube Initial Performance." AIAA 2017-0102, 55th AIAA Aerospace Sciences …

… [5] show that the AFRL Mach 6 Ludwieg Tube has typical normalized RMS Pitot pressure
fluctuations of about 2 – 3%. The AFRL VKF Tunnel D blow-down-to-vacuum facility that was …

… High speed Schlieren and PLIF visualization were performed by Kimmel et al. as part of the
initial performance investigations for the AFRL Ludwieg tube. [22] Schlieren images could be …

… Ludwieg tube designs. The UTSA facility also borrows from the design employed by AFRL
where a symmetrically-folded driver tube … Results describing the performance and capabilities …

… affect wind tunnel starting performance, as this opening time is less than half of most driver
… initial Phase I fast-valve (1GFV) prototype was purpose-built to AFRL’s Mach 6 Ludwieg Tube…

… This paper will focus on the characterization of the performance of this new facility. …
The Ludwieg tube concept was initially proposed by H. Ludwieg in 1955 [1] and has been …

… A high-speed schlieren system was used to determine the transition location on a cooled
7 sharp cone in Mach-6 flow at the AFRL Ludwieg Tube. Cooling the cone surface resulted in …

… The Air Force Research Laboratory (AFRL) [27] recently developed a Ludwieg tube capable
… , and the knowledge gained regarding the performance of the facility during this time frame …