Unsteady Flow Distortion Past Blades: Source of Noise Generation in Rotating Flows.
Abstract
The overall goals of this program are to: (1) Determine the instantaneous flow structure past blading and interpret it in terms of pressure sources using high-image-density particle image velocimetry. In turn, these pressure source terms are to be decomposed into vorticity-related and rate-of-strain related contributions; (2) Establish active (open loop) control concepts for flow past blading. Generic leading-and trailing-edge interactions will be addressed. Control concepts are to incorporate harmonic, amplitude- and frequency-modulated disturbances. Attempts will be made to: (a) Destabilize normally coherent fluctuations into multiple-spectral or broadband distributions; (b) Restabilize modulated fluctuations to a periodic state; and (c) Modify the level of broadband fluctuations; (3) Implement active control concepts in a unique, actively-controlled radial flow machine, allowing arbitrary inflow and impeller perturbations. The flow structure in the machine is to be subjected to various phase-shifting concepts in order to optimize the flow control; and (4) Develop new approaches to high-density particle image velocimetry, involving innovative approaches to acquisition of images, as well as processing and post- processing of images to provide global, instantaneous insight. (KAR) p. 2
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 02, 1993
- Accession Number
- ADA298903
Entities
People
- Donald O. Rockwell
Organizations
- Lehigh University