Planar Blast/Vortex Interaction and Sound Generation

AIAA Journal ◽  
2002 ◽  
Vol 40 (11) ◽  
pp. 2298-2304 ◽  
Author(s):  
H. Chen ◽  
S. M. Liang
Keyword(s):  
Vortex Interaction ◽  
Sound Generation

A New Look at Sound Generation by Blade/Vortex Interaction

1985 ◽  
Vol 107 (2) ◽  
pp. 224-228 ◽  
Author(s):  
J. C. Hardin ◽  
J. P. Mason
Keyword(s):  
Low Frequency ◽  
Initial Position ◽  
Sound Pulse ◽  
Two Dimensional ◽  
Vortex Interaction ◽  
Dimensional Problem ◽  
Sound Generation ◽  
Blade Vortex Interaction ◽  
Vortex Velocity

As a preliminary attempt to understand the dynamics of blade/vortex interaction, the two-dimensional problem of a rectilinear vortex filament interacting with a Joukowski airfoil is analyzed in both the lifting and nonlifting cases. The vortex velocity components could be obtained analytically and integrated to determine the vortex trajectory. With this information, the aeroacoustic low-frequency Green’s function approach could then be employed to calculate the sound produced during the encounter. The results indicate that the vortex path deviates considerably from simple convection due to the presence of the airfoil and that a reasonably sharp sound pulse is radiated during the interaction whose fundamental frequency is critically dependent upon whether the vortex passes above or below the airfoil. Determination of this gross parameter of the interaction is shown to be highly nonlinearly dependent upon airfoil circulation, vortex circulation, and initial position.

Sound generation by shock-vortex interaction.

AIAA Journal ◽  
1967 ◽  
Vol 5 (4) ◽  
pp. 660-669 ◽  
Author(s):  
THOMAS M. WEEKS ◽  
DARSHAN S. DOSANJH
Keyword(s):  
Vortex Interaction ◽  
Sound Generation

Planar blast/vortex interaction and sound generation

AIAA Journal ◽  
2002 ◽  
Vol 40 ◽  
pp. 2298-2304
Author(s):  
H. Chen ◽  
S. M. Liang
Keyword(s):  
Vortex Interaction ◽  
Sound Generation

Wake-body interaction Noise Simulations by Coupling CFD and BEM

2021 ◽  
Vol 263 (1) ◽  
pp. 5360-5371
Author(s):  
Masaaki Mori
Keyword(s):  
Heat Exchanger ◽  
Vortex Shedding ◽  
Peak Frequency ◽  
Vortex Interaction ◽  
Sound Generation ◽  
Rotating Blades ◽  
Body Interaction ◽  
Noise Radiation ◽  
Dominant Peak ◽  
Small Spacing

In many engineering applications, the wake-body interaction or body-vortex interaction (BVI) occurs. In the wake-body interaction, vortices shed from an upstream obstacle interact with downstream obstacle and generate noise, for example blades in a turbomachinery, tubes in a heat exchanger, rotating blades like a helicopter and wind turbine and so on. The rod-airfoil and airfoil-airfoil configurations are typical models for the wake-body interaction. A rod and an airfoil are immersed upstream of the airfoil. In this paper, we reviewed the noise mechanism generated by the wake-body interaction and show the numerical results obtained by the coupling method using commercial CFD and acoustic BEM codes. The results shows that depending on the spacing between the rod or airfoil and the airfoil, the flow patterns and noise radiation vary. With small spacing, the vortex shedding from the upstream obstacle is suppressed and it results in the suppression of the sound generation. With large spacing, the shear layer or the vortices shed from the upstream obstacle impinge on the downstream obstacle and it results in the large sound generation. The dominant peak frequency of the generated sound varies with increasing of the spacing between the two obstacles.

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