Long-lasting emission from femtosecond excitation of nitrogen-based flows shows promise
as a useful mechanism for a molecular tagging velocimetry instrument. The technique …

Inlet flow distortion is expected to play a major role in future aircraft architectures where
complex air induction systems are required to couple the engine with the airframe. The …

High-energy burst-mode lasers have enabled the development of kHz–MHz rate, multi-
dimensional diagnostics for characterizing highly dynamic and transient phenomena in …

Picosecond laser electronic-excitation tagging (PLEET) was demonstrated in a Mach-6
Ludwieg tube at a repetition rate of 100 kHz using a 1064 nm, 100 ps burst-mode laser. The …

The recent progress in high-speed (≥ 100k H z) laser diagnostics for hypersonic flows is
reviewed. Owing to the ultrahigh flow speed, a laser frequency of 100 kHz or higher is …

This manuscript describes the wide variety of optical measurement techniques for
characterizing the flow in hypersonic wind tunnels. The introduction briefly describes …

A new reflected shock tunnel capable of generating hypersonic environments at realistic
flight enthalpies has been commissioned at Sandia. The tunnel uses an existing free-piston …

In this work, we study the effect of the compression-corner angle on the streamwise turbulent
kinetic energy (sTKE) and structure in Mach 2.8 flow. Krypton tagging velocimetry (KTV) is …

Femtosecond laser electronic excitation tagging (FLEET) velocimetry was used in the
boundary layer of an ogive-cylinder model in a Mach-6 Ludwieg tube. One-dimensional …

Burst-mode femtosecond laser electronic excitation tagging (FLEET) of nitrogen is
introduced for tracking the velocity field in high-speed flows at kilohertz–megahertz (kHz …