Flow Visualization, Surface Pressure and Velocity Measurements on a Cylindrical Surface with a Bump

2006 ◽  
Author(s):  
Murat Tutkun ◽  
Peter Johansson ◽  
B. Anders Pettersson-Reif
Keyword(s):  
Flow Visualization ◽  
Surface Pressure ◽  
Cylindrical Surface ◽  
Velocity Measurements ◽  
Pressure And Velocity Measurements

Self-sustained oscillation of a jet impinging upon a Helmholtz resonator

1987 ◽  
Vol 179 ◽  
pp. 77-103 ◽  
Author(s):  
W. M. Jungowski ◽  
G. Grabitz
Keyword(s):  
Helmholtz Resonator ◽  
Sustained Oscillation ◽  
Flow Oscillation ◽  
Velocity Measurements ◽  
Fluctuating Pressure ◽  
Air Jet ◽  
Oscillation Mechanism ◽  
Large Pressure ◽  
Detached Shock Wave ◽  
Pressure And Velocity Measurements

A planar, sonic, underexpanded air jet induced strong and self-sustained flow oscillation. The jet was bounded by two parallel walls extending between the nozzle and the Helmholtz resonator opposite. This oscillation was characterized by large pressure amplitudes in the resonator and periodic displacement of a detached shock wave. The observed phenomena were in some measure similar to those occurring with Hartmann-Sprenger tubes. Based on the experimental results, including Mach-Zehnder interferograms and fluctuating pressure and velocity measurements, the properties of the oscillation have been described and a model for theoretical analysis has been established. Experimental and numerical investigations have made possible a description of the oscillation mechanism, which is of the relaxation type.

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