Accession Number:

AD0781396

Title:

Application of Holographic Interferometry to Supersonic Flow Visualization of a Rear-Facing Step and Application of Fast Fourier Transform Methods to Current Data Reduction Techniques.

Descriptive Note:

Master's thesis,

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s):

• Jones,Harland Wilber , Jr

Report Date:

1974-03-01

Pagination or Media Count:

90.0

Abstract:

The successful application of holographic interferometry to the study of three-dimensional density fields around bodies in wind tunnel experiments has been reported in the literature. The present report has extended the application of holography as a flow visualization technique by investigating Mach 2.8 flow over a rear-facing 18 in. step. Two single-exposed holograms of the model and two double-exposed frozen fringe holographic interferograms of the flow were created. Fast Fourier Transform FFT methods have been reported as significantly reducing computational time. Two computer programs were designed to apply FFT methods to the Fourier transform approach to the basic interferometric equation. Modified author abstract

Descriptors:

• *Base flow
• *Supersonic characteristics
• *Flow visualization
• Holography
• Interferometry
• Fourier transformation
• Computer programs
• Wind tunnel models
• Mathematical models
• Equations of motion
• Flat plate models
• Boundary layer
• Laminar flow
• Turbulent flow
• Theses

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE