| The structure and flow property of the spillway's tortuous path are important to the spillway and even the key water control project. With the unceasing built of large-scale and medium-sized irrigation works, the problem of flow property of the tortuous path is becoming more and more eminent, which makes many questions need to be resolved. But the property is complex and the effective factors are much more, so that not only the theoretical research but also the experimental one needs the thorough study. But until the recent, the report on this region is very scarce, which raises a new project for the research on the flow property of the spillway's tortuous path. According to the actual situation of the Shan'xi province, basing on the model test and combining the concrete engineering example, the article had made a research on the flow properties of the tortuous path, while the path was combined by many kinds of structures. The research contents and conclusions are as follows: 1. Basic property research on the tortuous path flow.The tortuous path flow not only exists in the spillway but also in other irrigation works and even in other places except the irrigation works. Based on the above, the article had researched the following contents: 1) Flow states of the tortuous path flow.Under the different structures' combination, the article hadresearched the change of the Fr from the entrance to the exit of the tortuous path, and obtained the properties of the torrent and slow flow in the tortuous path. Founding that the Fr of the tortuous path flow had all changed in longitudinal (along the circuit), transverse (between the sink and convex bank) and vertical orientation (from the water surface to the bottom). This had showed that it was impossible that there had pure torrent or slow flow but the coexist and continuous change of them in the tortuous path, this had a certain difference with the traditional theory.2) Bias and turn-around of the water surface.Under the all different structures' combination, the water surface had large bias and turn-around in the torturous path, and in the middle of the path along the longitude, there had the regularity that sink bank surface was higher than the convex bank one. But there had phenomena that the middle surface was higher than the both sides' and even the sink bank one was lower than the convex bank one.3) Current velocity distribution research.The lengthways velocity obtained from the experiments were all changed in the longitudinal, transverse and vertical orientation. And the changes were different in different parts and sections. So it could be concluded that the flow in the tortuous path was really spiral flow, and the experiments showed that the there had many spirals and even reverse spirals coexisted in the path.According the above, the author obtained the conclusion that the basic property in the tortuous path was more complex than thetheoretical property. The research in the article will rich the achievements of the theoretical research on the flow property of the tortuous path, and has a certain academic value. 2. Flow property research in the tortuous path with the combination of different structures.The author had researched the flow properties with six kinds of combinations.1) The combination of different corners, radiuses and bottoms.2) The combination of likely corners and radiuses with different bottoms.3) The combination of alike corners, radiuses and bottoms with different border coefficients.4) The contrast between the conditions with exit incline ridge and the one without it.5) The contrast between the conditions with entrance ridge and the one without it.6) The contrast between different heights of the ridge.Through contrasting the researches in the system, the author had found that within the above influence factors, the corner was the most important one. Above all, the influence with combination of big corner, large bottom and sluice c... |
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