Steady state risetimes of shock waves in the atmosphere

Details Steady state risetimes of shock waves in the atmosphere Steady state risetimes of shock waves in the atmosphere

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hsrs.conf..109r&link_type=abstract

In NASA. Langley Research Center, High-Speed Research: Sonic Boom, Volume 1 p 109-115 (SEE N92-33874 24-05)

Physics

Acoustic Scattering, Atmospheric Turbulence, Planetary Boundary Layer, Shock Wave Propagation, Sonic Booms, Steady State, Algorithms, Square Waves

Scientific paper

A square wave shape is used in the Pestorius algorithm to calculate the risetime of a step shock in the atmosphere. These results agree closely with steady shock calculations. The healing distance of perturbed shocks due to finite wave effects is then investigated for quasi-steady shocks. Perturbed 100 Pa shocks require on the order of 1.0 km travel distance to return to within 10 percent of their steady shock risetime. For 30 Pa shocks, the minimum recovery distance increases to 3.0 km. It is unlikely that finite wave effects can remove the longer risetimes and irregular features introduced into the sonic boom by turbulent scattering in the planetary boundary layer.

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