https://phys.org/news/2018-11-neutrons-fluid-hypersonic-flight.html

"In hypersonic systems, when you're flying at, say, Mach 5, you're basically flying like 1,000 meters per second, and the fuel has to be sprayed into a supersonic flow, which then has less than a millisecond to burn," said UT Associate Professor Zhili Zhang. "So we need a nozzle efficient enough to do this; but, unfortunately, there's no standard nozzle that exists."

Using the IMAGING beamline CG-1D at ORNL's High Flux Isotope Reactor, the researchers designed an experiment using different nozzle configurations to study the interior and exterior flow patterns before and just after the spray is dispersed into the combustion chamber.