Abstract：Combining the common inner dissipation way of the orifice and the plug in water pipe or spillway with the dissipation way in free flow, the inner energy dissipater of tooth block was proposed, and the tooth block with different area contraction ratio by physical modeling experiment was studied to analyze its conveyance capacity, dissipation ratio, pressure changes along the tube and the characteristics of fluctuating pressure. The results show that the conveyance capacity of tooth block dissipater is mainly determined by the energy dissipater′s shape and size. The conveyance capacity is proportional to the area contraction ratio, while the energy dissipation ratio is opposite. The time-averaged pressure of schemes drops suddenly in contraction section, then gradually rises and returns to stability, and their recovering length is almost the same. The maximum point of pressure fluctuation appears at 1 time tunnel diameter away from outlet of the tooth block, and decreases rapidly along the tube, and then becomes stability after 4 times tunnel diameter. The tooth block with area contraction ratio of 0.471 2 has a better capacity of resisting cavitation than others as its pulsating strength is small, and its distribution of the probability density is approximate to Gauss distribution.
张婷, 田淳, 李永业, 尤志强, 樊盼. 齿墩状内消能工的消能及压力特性[J]. 排灌机械工程学报, 2014, 32(2): 136-139.
Zhang Ting, Tian Chun, Li Yongye, You Zhiqiang, Fan Pan. Characteristics of energy dissipation and pressure within inner energy dissipaters of tooth block. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(2): 136-139.
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