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为消除中闸室出口侧墙上的掺气盲区并且改善水流流态,该文提出了突扩-渐扩侧掺气体型。采用RNG k-ε紊流模型对此掺气体型进行数值模拟,获得了侧墙上水流流态、压力分布以及水翅强度等水力特性。利用物理模型试验对计算结果进行验证,计算结果具有可靠性。结果表明:出闸水流弗劳德数一定时,侧墙突扩宽度和渐扩长度是影响水翅强度的主要因素,突扩宽度越大或渐扩长度越短,水翅强度越大;侧墙压力中心主要是由出闸水流冲击泄洪洞底板造成的;此掺气体型能形成稳定侧空腔并且侧墙上无负压产生,能够有效避免空化空蚀。
In order to eliminate the blind zone of aeration in the outlet wall of the middle sluice chamber and to improve the fluid flow regime, a sudden expansion-divergent divergent gas type is proposed. The RNG k-ε turbulence model was used to simulate the aerated body shape, and the water flow characteristics, pressure distribution and water fin strength were obtained. The physical model test is used to verify the calculation results and the results are reliable. The results show that when the Froude number of outflow is constant, the protruding width and the divergence length of the side wall are the main factors that affect the fin strength. The larger the width of the sudden protrusion or the shorter the divergence length, the greater the strength of the fin. The wall pressure center is mainly caused by the gate flow striking the floor of the spillway tunnel. This gas-filled type can form a stable side cavity with no negative pressure on the side wall, which can effectively avoid cavitation and cavitation erosion.