Accession Number:

ADA566128

Title:

Closed-Loop Control for High Reynolds Number Turbulent Compressible Jets

Descriptive Note:

Final technical rept. 15 Sep 2010-14 Sep 2011

Corporate Author:

SYRACUSE UNIV NY DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s):

• Glauser, Mark N.
• Lewalle, Jacques

Report Date:

2011-12-14

Pagination or Media Count:

28.0

Abstract:

From the viewpoint of the PIs, this project has been very successful on several fronts. The data acquisition has yielded good acoustic and PIV records some effect of jet actuators on farfield noise have been measured through spectra and cross-correlations POD decomposition of near-field velocity shows that cross-correlations with the far-field noise is accounted for by velocity mode 6 within a particular downstream r- plane window the wavelet processing of near-field pressure provides insight into convected flows structures and their possible breakdown, and associates them with distinctive cross-correlations with the far-field wavelet processing of coherent far-field noise identified individual sources and some of their properties, including precise lags in arrival time at far-field microphones the calculation of acoustic path refraction by the mean flow yields a table of source locations and far-field lags, which connects for the first time the far-field measurements of individual sources to their approximation locations and properties.

Descriptors:

• *ACTUATORS
• *CLOSED LOOP SYSTEMS
• *CROSS CORRELATION
• *REYNOLDS NUMBER
• ACOUSTICS
• ANECHOIC CHAMBERS
• DATA ACQUISITION
• DOWNSTREAM FLOW
• EXTERNAL STORES
• FAR FIELD
• HYDRODYNAMICS
• NEAR FIELD
• VELOCITY

Subject Categories:

• Machinery and Tools
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE