Noise constraints effecting optimal propeller designsA preliminary design tool for advanced propellers was developed combining a fast vortex lattice aerodynamic analysis, a fast subsonic point source noise analysis, and an optimization scheme using a conjugate directions method. Twist, chord and sweep distributions are optimized to simultaneously improve both the aerodynamic performance and the noise observed at a fixed relative position. The optimal noise/performance tradeoffs for straight and advanced concept blades are presented. The techniques used include increasing the blade number, blade sweep, reducing the rotational speed, shifting the spanwise loading and diameter changes.
Document ID
19850067955
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Miller, C. J. (NASA Lewis Research Center Cleveland, OH, United States)
Sullivan, J. P. (Purdue University West Lafayette, IN, United States)