Accession Number:

ADA172517

Title:

Velocity Measurement by Pulsed Doppler.

Descriptive Note:

Final rept. Sep 84-Sep 85,

Corporate Author:

SHEFFIELD UNIV (ENGLAND) DEPT OF CHEMICAL ENGINEERING AND FUEL TECHNOLOGY

Personal Author(s):

Report Date:

1985-11-16

Pagination or Media Count:

23.0

Abstract:

The optical monitoring of fluid flows and particulates has in a the past generally divided between those methods which provides a single snapshot over a wide field diameter and those which provide a continuous record at a single point. Laser Doppler anemometry comes into the latter category and it is clear that in order to accumulate the same information on the spatial distribution of velocity as wide field methods, a traversing of the field must be carried out. While this is commonplace among users of LDA, it requires that the velocity field be steady or at least reproducible in short between tests, single firings or periodic systems. The motivation behind the present program has stemmed from the perceived need to overcome the single point capability of LDA in certain cases of interest to USAF. These were originally seen to be short rocket motor firings, which typically last for only a few seconds, but are now considered to include the growing area of time dependent 3-D flow measurement. This letter is now known to be at the heart of many simple combustion systems involving large scale mixing.

Subject Categories:

  • Lasers and Masers
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE