Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.
The hydraulic analogy existing between the propagation of
wavelets at the free surface flow of a liquid and the propagation
of acoustic waves in a compressible gas is used to study
aerodynamics problems with phenomena at flow around solids
at supersonic velocities and aeroacoustic phenomena in
supersonic divergent jets. In particular, water level fluctuations,
which are proportional to pressure fluctuations in the gas, are
measured with an optical fiber and special measuring apparatus.
Investigations are carried out on a convergent-divergent (de
Laval) nozzle. This phenomenon is linked to the existence of
shock-cells in supersonic jets, which are formed in the output of
the nozzle. These experimental results will be compared with
the results from numerical solution and will be obtained from
our own program and from the commercial program CFD