Accession Number:

AD0769475

Title:

Notes on Euromech 34 on Control and Feedback Mechanisms in Flow Noise; Goettingen October 1972.

Descriptive Note:

Technical memo,

Corporate Author:

ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)

Personal Author(s):

• Broadbent,E. G.

Report Date:

1973-02-01

Pagination or Media Count:

37.0

Abstract:

Section 1 of the report is the introduction. Section 2 deals with noise in ducts and cavities and includes a number of papers concerned with wind-tunnel noise. Probably the most original paper in this section is that by Swinbanks of Cambridge in which he shows that in principle the noise in a symmetric duct can be suppressed by an active arrangement of sound sources and a suitable control system. Section 3 deals with shear layers including free jets and shear layers formed downstream of a splitter plate with reference to the Kutta condition. This section includes a number of papers of direct aeronautical interest on both experiments and theory. Section 4 deals with sound production arising from the interaction of flows with moving surfaces. Finally sect 5 contains three papers rather loosely grouped under the heading of interaction of sound with turbulence.

Descriptors:

• *FLOW NOISE
• *SYMPOSIA
• DUCTS
• CAVITIES
• SHEAR PROPERTIES
• JET FLOW
• VORTEX SHEDDING
• UNITED KINGDOM

Subject Categories:

• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE