Accession Number:

ADA312469

Title:

High-Resolution Digital Two-Color PIV (D2CPIV) and its Application to High Freestream Turbulent Flows.

Descriptive Note:

Final rept. 1 Nov 95-9 Jul 96,

Corporate Author:

WRIGHT LAB WRIGHT-PATTERSON AFB OH

Report Date:

1995-12-16

Pagination or Media Count:

13.0

Abstract:

An extension of two-color Particle Image Velocimetry PIV is described in which the recording media color film is replaced with a high-resolution 3060 x 2036 pixel color CCD sensor. Incorporation of the sensor eliminates the time associated with film development and digitization. Use of color allows the removal of directional ambiguities without resorting to polarization-based image-shifting techniques. For comparing the performance of the color CCD sensor with conventional color film. PI images were obtained on a sand-blasted surface undergoing a known translation and rotation under comparable lighting and camera conditions. Good agreement was obtained between the two recording media, indicating that the behavior of the color CCD sensor is similar to that of 400-ASA color film. This digital two-color PIV D2CPIV technique was used for studying simulated turbine film-cooling flows to obtain more detailed characterization of the coolant-injection phenomena and their interaction with freestream disturbances. This technique allowed near-real-time optimization of the PIV parameters which resulted in higher valid vector density and shear-layer resolution.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE