Abstract
In the paper, the effects of different Reynolds numbers on the flow and dynamic characteristics of the thermowell were studied. The results show that a “downwash” phenomenon occurs in the thermowell wake flow field, a “tip” vortex exists on the right, and a “mushroom” vortex lays at the bottom of the free end of the thermowell. The lengths of the reflux zone and the forms of vortex shedding are different on the different horizontal sections of a thermowell. With the increase of the Reynolds number, the size of the “mushroom” vortex gradually decreases, and the “tip vortex” gradually increases. At the same horizontal section, the length of the recirculation zone becomes shorter with the increase of the Reynolds number, and the vortex shedding form gradually changes from “2S” shape to the straight line shape. In the region below 50% height of the thermowell, with the increase of Reynolds number, the boundary layer separation line gradually moves forward, both flow resistance of the casing and “downwash” phenomenon gradually increase, and both lift force around the casing and vortex shedding frequency in the wake decrease. The flow resistance and vibration induced by vortex shedding are the leading causes of thermowell damage.
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