Exploration of Transition Mechanism of Flow State of Turbulent Jet Using Thermal Floatation Method Using Infrared Cameras
In order to explore the transition mechanism of three flow states of turbulent jet,a controllable turbulent jet experimental instrument is designed and constructed.Three flow states are captured using the thermal float method,achieving visualization and accurate measurement of turbulent jet.The relationship between fluid transition velocity and Reynolds number in envelope state is observed and analyzed through experiments,and the range of critical Reynolds number for transition is determined,providing a feasible method for measuring Reynolds number in the laboratory.The semi empirical formulas for propulsion force and fluid velocity in vortex ring state are derived and verified.At the same time,the pressure distribution image at the nozzle section is displayed through color simulation method.The mechanism of vortex ring transition is analyzed using grid meshing,which improves the precise measurement and analysis of fluid motion process.
thermal floatation methodenvelope statevortex ring stateturbulent stateinfrared camera
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