Far Field Rotor Noise
Abstract
The work covered two main areas of research--the aerodynamics of rotor blades including viscous and high angle of attack effects and, secondly, the propagation of noise from the rotor blade, particularly the nonlinear propagation. The aerodynamics work included the development and testing of a Navier-Stokes computational solver for rotor blades which incorporates rotating, translating, flapping and feathering motions. Results, which focus on the British Experimental Rotor Programme (BERP) blade, clearly show the importance of including all motions in the calculation of aerodynamic-forces. The acoustics research concentrates on the development of a method for computing the non linear propagation of acoustic signals in the atmosphere. The method is based on a boundary-element discretization of the time-dependent, nonlinear wave equation. Results, computed for a spherically symmetric domain, show an equivalence with Whitham's method up to the formation of a shock.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 22, 1993
- Accession Number
- ADA260703
Entities
People
- Valana L. Wells
Organizations
- Arizona State University