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ANALYSIS OF OPTICAL AND THERMAL IMAGE RECORDINGS OF TESTS WITH DIGITAL PROCESSING

Objective

DEVELOPMENT OF APPROPRIATE DIGITAL IMAGE PROCESSING SOFTARE FOR ANALYSIS OF IMAGES.
DEVELOPMENT OF SPECIALIZED SOFTWARE FOR THERMAL IMAGES.

DURING SMALL SCALE TESTS IN WHICH TWO-PHASE JETS OR CLOUDS ARE RELEASED FLOW VISUALISATIONS WILL BE PERFORMED. THE VKI WILL GIVE ADVICES TO WHICH TYPE OF VISUALISATIONS SHOULD BE PERFORMED.
EXAMPLES OF METHODS ARE : BULK FLOW ILLUMINATION, LONGITUDINAL AND TRANSVERSAL LASER SHEETS, HIGH SPEED VIDEO RECORDING, PHOTOGRAPHY, MOVIE.
THE MOST SUITABLE METHODS WILL BE SELECTED AND COMPUTER PROGRAMMES WILL BE PREPARED AT VKI IN ORDER TO EXTRACT INFORMATION FROM THESE VISUAL RECORDS.
THE DATA TO BE OBTAINED ARE OF DIFFERENT NATURE : GEOMETRICAL CHARACTERISTICS SUCH AS CROSS AREA OR LONGITUDINAL AREA OF THE CLOUD WILL BE QUANTIFIED. THE CONCENTRATION OF DROPLET WITHIN THE JET OR CLOUD WILL BE EVALUATED. THESE TASKS REQUIRE SPECIAL SOFTWARE THAT WILL ALLOW A CORRECT GEOMETRICAL QUANTIFICATION. THIS WILL INCLUDE METHODS FOR CORRECTING FOR PERSPECTIVE AND FOR UNEVEN ILLUMINATION.
FINALLY, ATTEMPTS WILL BE MADE AT MEASURING THE SIZE OF DROPLETS. THE SUCCESS OF THIS METHOD WILL DEPEND UPON THE NATURE OF THE VISUAL RECORDS WHICH WILL BE AVAILABLE. BECAUSE OF THE LIMITATIONS IN THE RESOLUTION OF THE DIGITAL IMAGE PROCESSING SYSTEM USED, AN OPTICAL MAGNIFICATION OF THE VISUAL RECORDS WILL BE MADE AND THIS MAGNIFICATION WILL BE LIMITED BY THE NATURE OF THE ORIGINAL IMAGE.
IT IS ALSO ANTICIPATED THAT VISUAL RECORDS ARE MADE OF THE LARGE SCALE TESTS. THE VAN KARMAN INSTITUTE WILL INVESTIGATE THE POSSIBILITIES TO EXTRACT INFORMATION FROM THESE TRIALS. PRIOR TO THE TESTS, METHODS USED FOR THESE VISUALISATIONS WILL BE DISCUSSED.
FINALLY IN THE TESTS P6, P10 AND P11, AN INFRARED CAMERA SHOULD BE USED TO OBTAIN THERMAL IMAGES OF THE TWO PHASE CLOUD OR JET. AN ANALYSIS PERFORMED WITH THE DIGITAL IMAGE PROCESSING SHOULD ALLOW FOR CORRECTION OF EMISSIVITY AND EMISSION ANGLE OF THE RADIATION. IT IS ANTICIPATED THAT INFORMATION ON THE HEAT TRANSFER WITHIN THE TWO-PHASE FLOW SHOULD BE DETERMINED.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

VON KARMAN INSTITUTE FOR FLUID DYNAMICS
Address
72,Chaussee De Waterloo 72
1640 Rhode-st-genese
Belgium