A vortex model of cavity flow
Abstract
The paper presents a model of two-dimensional cavity flow in which the shear layer over the cavity is represented by discrete rectilinear vortices which are free to move as the flow progresses. Although the model is initially started impulsively, the computation is continued until a statistically steady flow is attained. The broadband noise generation of the cavity is calculated by first running the model until the steady state is reached and then computing a stationary record of far-field density fluctuation through an equation that is suitable for calculating the quadrupole noise generation by the model. The discrete time series obtained can be analyzed by ordinary digital spectral techniques to determine the spectra and overall levels of the noise in airframe noise testing of real aircraft.
- Publication:
-
American Institute of Aeronautics and Astronautics Conference
- Pub Date:
- July 1976
- Bibcode:
- 1976aiaa.confR....H
- Keywords:
-
- Cavitation Flow;
- Cavity Flow;
- Flow Theory;
- Noise Spectra;
- Shear Layers;
- Two Dimensional Flow;
- Vortices;
- Aircraft Noise;
- Airframes;
- Cavity Flow;
- Far Fields;
- Mathematical Models;
- Noise Generators;
- Steady Flow;
- Time Series Analysis;
- Acoustics