Research On Narrow-slot Energy Dissipators Of Extremely Narrow River Channel

With the development of hydropower in China, raised a hot wave of water conservancyproject construction. The quantity of water conservancy project, the safety of the waterconservancy project is particularly important, and the impact on the safety of waterconservancy projects energy dissipation is perhaps the most striking problems, waterconservancy project drainage buildings impingement problems of energy dissipation is one ofthe major considerations in the design work. At present our country has built a batch of waterconservancy projects in the alpine valleys, with large flow, high water head, energydissipation per unit width of concentration and energy dissipation power, etc. For example,dongjiang, laxiwa, results, shuibuya project, all these projects by using the narrow gap canwork to solve the problem of narrow channel of energy dissipation, narrow gap energydissipation work got a wide range of promotion in our countryIn this paper, the physical model tests of hydraulic energy dissipation problemsDakequke hydropower and flood diversion flushing hole through study and practice. TheDakequke hydropower Project in Xinjiang Yulong Kashgar River downstream river canyonmountains, spillway and outlet are arranged in the spillway tunnel at right bank open, floodspillway outlet downstream of the spillway at approximately50m downstream spillwaytunnel enter a period of60the average width of about12m,9m around the narrowest alpinevalleys, energy dissipation concentrated, single-wide traffic, table hole bottom energydissipator can not influence each other,spillway tunnel axis river and there are more than20°angle, flood cave will assume the task in the diversion of diversion, so the larger the energydissipation workers to adapt to the range of operating conditions. According to the actualsituation of the project, we have tested the classic challenges such as wide and three narrowjoint bucket bucket by summary trial process analysis to determine the exit slit parallel sidewalls flip bucket for the final program, which can basically meet the engineering all that isneeded. Parallel to the side wall outlet into a narrow joint bucket shaped asymmetrical shapenarrow joint bucket, bucket pick the right wall is not oriented to the left turn to the right wall is composed of three sections consisting of straight sidewalls.positive arc from the bottomsection, and a horizontal section of ogee smooth bottom connection, namely sunkenfloor,flip bucket length26m, contraction ratio of0.5.Parallel to the side wall outlet slit flip bucket spillway flip bucket with four narrowdifferential flip bucket with a good, both affect small,bucket at the diversion conditions,design conditions, working conditions, such as checking the performance of the vastmajority of working conditions good pick kanneh smooth surface, can form narrow tongue ofwater, go downstream river, red in the case can meet the engineering requirements. Becausenarrow joint bucket raised, most of the time the initial diversion of flow diversion tunnel isrunning out, flow pattern was very good.Overall, exports of narrow joint bucket parallel side walls flip bucket spillway anddiversion solve flushing hole energy dissipation and erosion problems.