Investigating the 'modified' complementary technique using pressure-velocity correlations of an axisymmetric jet

André M. Hall, Charles E. Tinney, Mark N. Glauser

Research output: Contribution to conferencePaperpeer-review

3 Scopus citations


To investigate the validity of the 'modified' Complementary Technique 10 as applied to the axisymmetric jet, a quantitative measure of the strength of the cross-correlation between the pressure field near the nozzle exit (z/D=0.875) and the velocity field is examined. The jet nozzle used in these experiments has an exit diameter of 5.08cm, and is operated in the compressible flow regime at M=0.6, at an exit temperature of 25°C. The fluctuating pressure field is sampled by an azimuthal array of 15 dynamic pressure transducers, evenly spaced at 24 degrees apart. The velocity field is simultaneously captured using a single point LDA system, with a 3-Watt argon ion laser head, traversed along several streamwise and radial locations. The cross-correlation between the pressure and streamwise component of the velocity field are examined as a function of radial, streamwise, & azimuthal (r,z, θ) location. The greatest magnitudes, on the order of 25% correlation, are observed within the potential core region just outside the centerline. Streamwise convection velocities of 0.77Uj and 0.73Uj are calculated in the potential core and shear layer, respectively. In the future, a spectral comparison can then be employed to validate Tinney et al's 12 application of the technique to the turbulent sound source regions of the axisymmetric jet.

Original languageEnglish (US)
Number of pages14
StatePublished - 2005
Event43rd AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States
Duration: Jan 10 2005Jan 13 2005


Other43rd AIAA Aerospace Sciences Meeting and Exhibit
Country/TerritoryUnited States
CityReno, NV

ASJC Scopus subject areas

  • General Engineering


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