Investigation of the magnetohydrodynamic damping of turbulent jet wave sources, using a shallow wave simulation for jet noise

Details Investigation of the magnetohydrodynamic damping of turbulent jet wave sources, using a shallow wave simulation for jet noise Investigation of the magnetohydrodynamic damping of turbulent jet wave sources, using a shallow wave simulation for jet noise

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975phdt........85c&link_type=abstract

Ph.D. Thesis Pennsylvania State Univ., University Park.

Computer Science

Sound

Damping, Jet Aircraft Noise, Magnetohydrodynamic Waves, Turbulent Jets, Magnetic Fields, Simulation, Surface Waves, Wave Equations

Scientific paper

A shallow liquid surface wave analogy to turbulence induced sound was utilized to investigate the effect of a longitudinal magnetic field on the wave production from a conducting jet. Analytically, the surface wave equation was derived including the magnetic source term. This equation was compared with its acoustic counterpart to validate the analogy. Further theoretical work served to identify certain magnetic effects which might accompany the turbulence damping. The experimental investigation utilized a 24 square foot mercury ripple tank. The waves were produced by the turbulence in a mercury jet exhausting into the tank. Damping of the turbulence was effected by a solenoidal magnet producing a field on the order of 1,500 Gauss. Initial results were used to experimentally substantiate the surface wave analogy. Measurement of mean and turbulent velocity profiles proved that the jet development was similar to the theoretical plane free jet.

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