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

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.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1997
Accession Number
ADA335307

Entities

People

  • Lincoln P. Erm

Organizations

  • Defence Science and Technology Group

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Aircrafts
  • Boundary Layer
  • Broadband
  • Computer Programs
  • Computers
  • Data Processing
  • Digital Signal Processing
  • Flow Visualization
  • Fluid Flow
  • Frequency
  • Hybrid Systems
  • Measurement
  • Mechanics
  • Signal Processing
  • Turbulent Boundary Layer
  • Turbulent Flow
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerial Delivery - Logistics and Supply Chain Management.
  • Approximation Theory.
  • Fluid Dynamics.