Study on Hydraulic Characteristics of Helicoidal-Ramp Dropshaft with Side Sills
Focus on the problem of increasing energy dissipation for helicoidal-ramp drop shaft,this paper develops a new form of helicoidal-ramp dropshaft with side sills.The side sills may generate the unique flow regimes of dropshaft,which increase energy dissipation remarkably.It is found from experiment observation that a part of flow is deflected by side sills and the jets are generated.Meantime,another part of the flow bypasses the side sills and becomes the wall pressing flow attaching the wall of the shaft.The jet and the wall pressing flow impact each other downstream of the side sill,thus a strong turbulent zone is generated.As a result,kinetic energy of flow is dissipated effectively.The experiment results demonstrate that the energy dissipation of helicoidal-ramp drop shaft with side sills is similar to that of stepped helicoidal-ramp drop shafts,but is larger than that of traditional helicoidal-ramp shaft about 20％～30％.Further,the hydraulics of the present drop shaft,including the flow regimes,pressure,energy dissipation and flow profiles are experimentally invested and the effect of side sill width on drop shaft flow is summarized in this paper.
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