Accession Number : AD0836802

Title :   A MOIRE' OPTICAL SYSTEM FOR QUANTITATIVE BOUNDARY LAYER MEASUREMENTS.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Hamm, Thomas F.

Report Date : JUN 1968

Pagination or Media Count : 57

Abstract : The modification of a single pass schlieren system, to obtain quantitative data (density gradient) by using Moire' patterns to measure the refractive index gradient presents a new simple and inexpensive optical system to assist in analyzing boundary layers. This paper includes a study of the effects of ruling line density and misalignment upon the measurements, and a feasibility study and verification test of the two dimensional capabilities on a cylinder. Set-up and alignment, and data reduction procedures are detailed. The system has yielded highly reproduceable results; the temperature gradient on a heated vertical flat plate was measured with an average deviation of less than 2% and less than 10% was obtained for a cylinder. (Author)

Descriptors :   (*BOUNDARY LAYER, MEASUREMENT), (*TWO DIMENSIONAL FLOW, SCHLIEREN PHOTOGRAPHY), SURFACE TEMPERATURE, FLAT PLATE MODELS, CYLINDRICAL BODIES, CURVED PROFILES, REFRACTIVE INDEX, INTERFEROMETERS, DENSITY, ALIGNMENT, PERFORMANCE(ENGINEERING), FEASIBILITY STUDIES, COMPUTER PROGRAMS, THESES.

Subject Categories : Photography
      Fluid Mechanics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE