Cross-correlation methods for studying near- and far-field noise characteristics of several flow-surface interaction problemsSystematic methods based on cross-correlation techniques are presented for experimental studies of near- and far-field noise characteristics of airflow-surface interaction problems. By cross-correlating any two of three-kinds of microphone measurements: one flush-mounted on the surface, one located in the near field, and one placed in the far field, far-field noise intensities and near-field acoustic energy fluxes can be determined. In both near and far fields, the noise characteristics due to the flow turbulence and surface fluctuating pressure contributions can be evaluated separately. Specific applications to the noise field generated by impinging jets, by surface blowing jets, and by turbulent flow over trailing edges are discussed.
Document ID
19740054789
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Pan, Y. S. (NASA Langley Research Center Joint Institute for Acoustics and Flight Sciences, Hampton, Va., United States)
Date Acquired
August 7, 2013
Publication Date
April 1, 1974
Subject Category
Aerodynamics
Meeting Information
Meeting: Meeting of the Acoustical Society of America