Modified Amplitude and Strouhal Number Scaling for Correction of Turbulent Wall Pressure Fluctuations

Abstract

Pressure fluctuations were measured in an external turbulent boundary layer over a buoyantly propelled axisymmetric body of revolution. Data were measured for three cases: 69.7 feet/second in fresh water, 43.2 feet/second in fresh water, and 70.9 feet/second in salt water. The fresh water temperature was 39 deg F and the salt water temperature was 70 deg F, resulting in axial length Reynolds numbers of 6.88x10 (exp 6), 4.27x10(exp 60, and 3.21x10 (exp 6( at the measurement locations. The fresh water measurements were made in a fully developed turbulent boundary layer, following natural transition, with a near zero (very mildly adverse) pressure gradient. The salt water measurements were made in a favorable pressure gradient following a flow trip to force transition. The momentum thickness Reynolds number Re theta was greater than 4400 for all measurements, and the data were scaled with outer variables.

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Document Details

Document Type
Technical Report
Publication Date
Feb 22, 1999
Accession Number
ADA640495

Entities

People

  • Thomas A. Galib

Organizations

  • Naval Undersea Warfare Center

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Amplitude
  • Boundaries
  • Boundary Layer
  • Data Analysis
  • Detectors
  • Fluid Mechanics
  • Frequency
  • Layers
  • Measurement
  • Pressure Distribution
  • Pressure Transducers
  • Reynolds Number
  • Strouhal Number
  • Test And Evaluation
  • Test Vehicles
  • Thickness
  • Turbulent Boundary Layer

Fields of Study

  • Physics

Readers

  • Environmental Engineering
  • Fluid Mechanics and Fluid Dynamics.