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Influence of vane sweep on rotor-stator interaction noise
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Envia, Edmane Kerschen, Edward J. |
| Copyright Year | 1990 |
| Description | The influence of vane sweep in rotor-stator interaction noise is investigated. In an analytical approach, the interaction of a convected gust representing the rotor viscous wake, with a cascade of cascade of finite span swept airfoils, representing the stator, is analyzed. The analysis is based on the solution of the exact linearized equations of motion. High frequency convected gusts for which noise generation is concentrated near the leading edge of airfoils is considered. In a preliminary study, the problem of an isolated finite span swept airfoil interacting with a convected gust is analyzed. Results indicate that sweep can substantially reduce the farfield noise levels for a single airfoil. Using the single airfoil model, an approximate solution to the problem of noise radiation from a cascade of finite span swept airfoils interacting with a convected gust is derived. A parametric study of noise generated by gust cascade interaction is carried out to assess the effectiveness of vane sweep in reducing rotor-stator interaction noise. The results show that sweep is beneficial in reducing noise levels. Rotor wake twist or circumferential lean substantially influences the effectiveness of vane sweep. The orientation of vane sweep must be chosen to enhance the natural phase lag caused by wake lean, in which case rather small sweep angles substantially reduce the noise levels. |
| File Size | 4220923 |
| Page Count | 168 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910008358 |
| Archival Resource Key | ark:/13960/t75t8jc80 |
| Language | English |
| Publisher Date | 1990-12-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Sweep Angle Sound Waves Approximation Noise Reduction Rotors Rotor Stator Interactions Airfoils High Frequencies Noise Generators Equations of Motion Noise Intensity Sweep Effect Wakes Stators Vanes Turbofan Engines Models Gusts Leading Edges Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
