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THE NON‐INVASIVE MEASUREMENT OF VOID FRACTION AND VELOCITY IN TWO PHASE FLOW USING HIGH SPEED PHOTOGRAPHY AND VIDEOPHOTOGRAMMETRY
Author(s) -
Stewart P. A. E.
Publication year - 1986
Publication title -
the photogrammetric record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.638
H-Index - 51
eISSN - 1477-9730
pISSN - 0031-868X
DOI - 10.1111/j.1477-9730.1986.tb00535.x
Subject(s) - photogrammetry , instrumentation (computer programming) , flow (mathematics) , computer science , photography , simulation , remote sensing , geology , artificial intelligence , mechanics , physics , operating system , art , visual arts
The presence of air and liquid, or two phase flow, in gas turbine oil or fuel systems poses performance analysis problems. Conventional instrumentation is invasive and, by its presence, changes the nature of the flow itself In order to analyse a system comprehensively, a number of non‐invasive measurements are preferable. One of the objectives of this project was to determine the feasibility of photogrammetry for this task. The study has fallen into two parts. The first part which has been completed, and is reported here, concerns an investigation of the problems of applying the photogrammetric technique by using stereoscopic images of two phase flow structures and measuring them using calibrated equipment. This has been successful and valuable experience has been gained. Images have been analysed and scientific data obtained. However the nature of the flow is transient and a series of isolated images do not describe the processes and may lead to ambiguities. For this reason, the opportunity provided by John Hadland Ltd. to use the Spin Physics SP2000 High Speed Video system in August, 1984 was taken; using calibrated twin video cameras, the first high speed digital video photogrammetric system was thus operated. Accuracies in three dimensions of better than 0.5 mm are claimed for this experimental work at 1000 fiames s ‐I .