Experiments and Numerical Simulations on the Mid-Term Evolution of Hypersonic Jets

Details Experiments and Numerical Simulations on the Mid-Term Evolution of Hypersonic Jets Experiments and Numerical Simulations on the Mid-Term Evolution of Hypersonic Jets

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ap%26ss.293..225b&link_type=abstract

Astrophysics and Space Science, v. 293, Issue 1, p. 225-232 (2004).

Astronomy and Astrophysics

Astrophysics

5

Astrophysical Jet, Hypersonic Jet, Compressible Mixing, Entrainment

Scientific paper

The experiment described here is focussed to the observation of underexpanded, hypersonic turbulent jets. The experiment is relevant to a few aspects concerning the dynamics of astrophysical phenomena such as the Herbig-Haro jets and to the interaction between the large-scale vortices and the system of shocks that determine the spreading and entrainment properties of highly compressible free-flows. A number of orifice jets with a ratio between the stagnation pressure and the ambient pressure of the order 103-104 have been studied by changing the stagnation/ambient density ratio. This has been realized using dissimilar gases in the jet and in the ambient medium: by using He, Ar and air the stagnation/ambient density ratio can be changed by one order of magnitude while keeping fixed the pressure ratio. It has been possible to visualize the near and mid-term evolution of the jets and measure the axial and transversal density distributions. A comparison relevant to the shock waves configuration in between the nozzle exit and the first Mach's disk is shown for an air in air laboratory jet and its numerical simulation.

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