Investigation of Mach number changes obtained by discharging high-pressure pulse through wind tunnel operating supersonically

Rudolph C. Haefeli, Harry Bernstein
naca-tn-3258
Aug 1954


A series of tests was performed to obtain an indication of the transient-flow phenomena caused by discharging a chamber of high-pressure gas into a wind tunnel operating supersonically. For the configurations tested, two types of gust were obtained. One had a maximum Mach number with a practically zero time duration. The other had a maximum Mach number with a finite time duration depending on the specific geometry. Such configurations are applicable as supersonic longitudinal-gust tunnels.

An Adobe Acrobat (PDF) file of the entire report:
http://naca.central.cranfield.ac.uk/reports/1954/naca-tn-3258.pdf