Floating Debris Before Sluice Gate Research On The Effects Of Flow And Flow Structure

With the worsening water pollution, rivers, reservoirs, lakes, vegetation, industrial and domestic waste, accidents class floating dirt mass gathering; particularly serious harm, floating debris accumulation occupy river section, increasing the riverbed resistance encountered obstacles river, causing serious congestion. When the floating debris is piled in front of the sluice, cause extremely negative impact on the safe operation of the sluice.At home and abroad for the vegetation in the river water flow problem on the basis of the study, combined with the basic theory of hydraulics and sluice outflow theory, the use of numerical simulation method to analyze the accumulation of floating debris research sluice gates gate before the flow velocity distribution and coverage The floating debris sluice overcurrent flows. By computational fluid dynamics software for numerical simulation of three-dimensional two-phase flow on the accumulation of floating debris in front of the gate. The main content of this paper are:1、Through experiment and numerical simulation data of the former presence of floating debris over current longitudinal velocity distribution of the gate when the comparative analysis, concluded that without floating debris, before the gate even period of longitudinal velocity distribution along the depth direction conforms to logarithmic distribution, with floating debris, the longitudinal velocity distribution approximation in the stomach type distribution.2、With the basic theory of hydraulics have before brake when the cover is deduced approximately uniform section velocity distribution expressions:the flow rate with maximum flow rate point for boundary, open channel flow can be divided into two layers in depth direction equivalent of open channel flow, and the accumulation coverage on sorting, the distribution of flow rate calculation, determine the floater roughness values range.3、Through the numerical simulation data of different calculation scheme of sluice flow flow sorting, calculated, and the fitting of a cover when the relationship between the flow rate correction coefficient is relative to the length of coverage, the accumulation of debris before brake lock flow calculation formula.This article, come to the gate before the accumulation of floating debris covered gate flow velocity distribution, increasing the coefficient of roughness of the river bed, lowering sluice overcurrent flows, affecting the operating efficiency of the sluice. Therefore, it is necessary to improve gate accumulation of floating debris hazard attention.