反拱水垫塘拱圈底板动水压强变化规律的研究

Research on Characteristics of Hydrodynamic Pressure of the Slabs of Ring in Arch Invert Cushion Pool

采用先进的模拟方法和量测手段,对高水头和大流量作用下反拱水垫塘拱圈底板动水压强进行了详细的试验研究。实现了拱圈位于反拱水垫塘流场中任意位置时,同步量测底板表面和底板缝隙中动水压强,得出拱圈底板动水压强沿流程以及沿拱圈横向的分布规律,揭示了底板块上举力的形成和变化机理;提出把底板缝隙动水压强划分为三种形态;提出底板块振动的可能方式;得出拱圈底板缝隙动水压强的频率分布范围比底板表面的更窄,但两者优势频率接近,脉动能量都以低频为主。

By using an advanced simulation method and the measurement technology, the research on the hydrodynamic pressure on the slabs of the ring in arch invert plunge pool by the action of high water head and large discharge has been carried out experimentally. An isochronous measurement on hydrodynamic pressure on the surface of slabs and in the base gap has been made when the arch-ring is located in the free position of entire flow field. Laws of the pressure distributions on the slabs of ring along both the lateral and the direction of the flow are obtained to reveal the change mechanism and the formation of uplift force of the bottom slabs. And three conformations of the distribution of hydrodynamic pressure in the base gaps are proposed and classi fied, and also the possible vibration patterns of the base slabs are advanced. Accordingly, the frequency spectrum of the hydrodynamic pressure in base gap is distributed which is narrower than that on the surface of slabs, but both dominant frequencies are approximating. The fluctuating energy of two is concentrated in the extent of low frequency.