Author(s): Niu Zhi-Pan; Zhang Chao-Ran

Linked Author(s):

Keywords: Fluctuating pressure; Multi-horizontal submerged jets (MHSJ); Experimental model; Flood discharge type

Abstract: At the beginning of the operation of a Hydropower Station adopted a new type of stilling basin with multi-horizontal submerged jets (MHSJ), it was found there was a phenomenon of roller shutter door and window vibration in some local area of the downstream region during the flood discharging process. The prototype observation indicated that the flow induced vibration is greatly influenced by flood discharging types with different open combination of the sluice gates. Flow fluctuating pressure is a main load that frequently causes damages to flood discharge structures, which is a crucial incentive that caused flow induced vibration of the downstream region of the hydropower station. In this paper, from the perspective of hydraulics, the flood discharging types with different open combination of the sluice gates under same flood discharge were simulated through a series of hydraulic model experiments. Judged by the values of fluctuating pressure on the bottom plate of stilling basin, it was found the joint discharging type of surface outlets and middle outlets is better than surface outlets discharging type or middle outlets discharging type. The response law between discharge allocation proportion of each outlet and fluctuating pressure characteristics in the still basin was preliminary revealed. The optimal flood discharge types were obtained. The research results can provide technical support for the operation and management of the Hydropower Station. The reduction of vibration intensity from the source is expected.

DOI: https://doi.org/10.15142/T3CW60

Year: 2018