Accession Number : ADA335307

Title :   Modifications to a Constant-Temperature Hot-Wire Anemometer System to Measure Higher-Order Turbulence Terms Using Digital Signal Processing.

Descriptive Note : Technical rept.,

Corporate Author : DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION CANBERRA (AUSTRALIA)

Personal Author(s) : Erm, Lincoln P.

PDF Url : ADA335307

Report Date : SEP 1997

Pagination or Media Count : 40

Abstract : An existing constant-temperature hot-wire anemometer system that enabled broadband-turbulence quantities to be determined using a hybrid analog/digital measurement technique has been modified so that turbulence quantities can now be determined using a purely digital technique. With the new system, higher-degree turbulence terms, such as u3, V3, w3, u2v, uv2, u4, v4 and w4, can now be obtained. These terms are used to calculate turbulent-kinetic-energy and Reynolds-shear-stress balances, and skewness and flatness factors, that could not be calculated previously. In this report the new equipment is described and the procedures and computer programs used to take measurements and process the data are detailed.

Descriptors :   *SIGNAL PROCESSING, *TURBULENCE, *HOT WIRE ANEMOMETERS, DIGITAL SYSTEMS, TURBULENT FLOW, COMPUTATIONAL FLUID DYNAMICS, FLOW FIELDS, SHEAR STRESSES, KINETIC ENERGY, DATA ACQUISITION, AUSTRALIA.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE