Engineering

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https://hdl.handle.net/20.500.14540/103

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Browsing Engineering by Advisor "Darlami, Kamal"

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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.
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    Numerical and Experimental Analysis of the Fluidic Thrust Vectoring by Shock Vector Control in a Two Dimensional Convergent - Divergent Nozzle
    (I.O.E, 2025-04) Acharya, Keshav Kumar; Darlami, Kamal
    This study presents a comprehensive numerical and experimental analysis of fluidic thrust vectoring using shock vector control (SVC) in a two-dimensional convergentdivergent (CD) nozzle. The research integrates computational fluid dynamics (CFD) simulations and Schlieren imaging experiments to evaluate the effects of secondary flow injection on thrust vectoring. The study begins with the development and testing of a single-mirror Schlieren imaging setup, which is utilized to visualize thermal plumes from candle and hand and later to visualize supersonic flow structures inside and at the exit of the nozzle. The CD nozzle is designed using the Method of Characteristics (MOC) and simulated in ANSYS Fluent to investigate the effect of nozzle pressure ratio (NPR), secondary pressure ratio (SPR), and secondary injection location on jet deflection. Experimental validation is conducted using a 3D-printed nozzle tested in the test rig constructed locally.
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