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DEVELOPMENT OF HYBRID CROSS-CORRELATION AND OPTICAL FLOW METHOD FOR BACKGROUND ORIENTED SCHLIEREN
(I.O.E, 2024-05-03) Chaulagain, Nimesh; Dhakal, Samiksha; Poudel, Shushant; Pandey, Sushil; Darlami, Kamal
Flow visualization is one of the most active fields of research in fluid dynamics. The BOS technique is a modern measurement technique aimed at obtaining quantitative data based on variations of refractive index in optically transparent fluids. Flow parameters can be measured with a simple experiment configuration with the help of this technique. This project aims to develop a hybrid algorithm combining cross-correlation with an optical flow algorithm that lends itself to an efficient algorithm that extracts the data accurately. A test setup was built for image acquisition for testing of the algorithm. Chronos 2.1 high-speed camera and iPhone 11 mobile phone were used to obtain image data from experiments conducted with a thermal plume from a candle as a unit test subject and an under-expanded jet from a nozzle as the main test subject. The project successfully demonstrated the efficacy of the hybrid cross-correlation and optical flow algorithm in the context of BOS. By integrating these techniques, the project introduced a novel approach to quantitative flow measurement, showcasing its accuracy and reliability in obtaining precise measurements.