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Theoretical and experimental investigations on incompressible flow through labyrinths
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| 其它 | A low, well defined and cavitation free flow has to be achieved for the leakage of coolant sodium in the annular space between the grid plate sleeve and foot of the core subassembly in the Prototype Fast Breeder Reactor (PFBR). The leakage flow is accompanied by a corresponding pressure drop which is a function of several parameters including turbulence quantities. Theoretical pressure drops for simple annular seals which offer the least flow resistance are found to be low and incapable of fully serving the intended purpose of reducing the sodium pressure profoundly. On the contrary, labyrinth seals provide intricate passages, offer higher resistance to flow and hence can lead to enhanced pressure drops. This paper formulates a theoretical model for estimating the pressure drop taking place in a labyrinth seal by considering the Darcy losses and the vortex losses occurring inside the cavity of the labyrinth. |
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