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Effect of wind tunnel acoustic modes on linear oscillating cascade aerodynamics
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Buffum, Daniel H. Fleeter, Sanford |
| Copyright Year | 1993 |
| Description | The aerodynamics of a biconvex airfoil cascade oscillating in torsion is investigated using the unsteady aerodynamic influence coefficient technique. For subsonic flow and reduced frequencies as large as 0.9, airfoil surface unsteady pressures resulting from oscillation of one of the airfoils are measured using flush-mounted high-frequency-response pressure transducers. The influence coefficient data are examined in detail and then used to predict the unsteady aerodynamics of a cascade oscillating at various interblade phase angles. These results are correlated with experimental data obtained in the traveling-wave mode of oscillation and linearized analysis predictions. It is found that the unsteady pressure disturbances created by an oscillating airfoil excite wind tunnel acoustic modes which have detrimental effects on the experimental data. Acoustic treatment is proposed to rectify this problem. |
| File Size | 1537816 |
| Page Count | 44 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19940011393 |
| Archival Resource Key | ark:/13960/t8pc7x31n |
| Language | English |
| Publisher Date | 1993-05-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Cascade Flow Acoustic Properties Cascade Wind Tunnels Subsonic Flow Wind Effects Unsteady Aerodynamics Oscillations Airfoils Aerodynamic Coefficients Pressure Measurement Influence Coefficient Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
