Flow interaction and noise from a counter rotating propellerThe aerodynamic interaction between the forward and rear rotors in a counter rotating propeller (CRP) system, has been examined using a conditional sampling technique applied to three-dimensional thermal anemometer data. The technique effectively freezes the rotors in any desired relative position and provides the inter-rotor flow field. Axial, radial and circumferential mean flow between rotors is shown relative to the 'fixed' forward rotor for various 'fixed' aft rotor positions. Acoustic far field noise data have also been collected for the same operating conditions. The acoustic results are presented with emphasis on the blade passing frequencies and interaction tone of the CRP.
Document ID
19910034754
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Chung, Jin-Deog (North Carolina State Univ. Raleigh, NC, United States)
Walls, James L. (North Carolina State Univ. Raleigh, NC, United States)
Nagel, Robert T. (North Carolina State University Raleigh, United States)