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对常规消能锥阀体型进行了改进,提出了一种新型的嵌套式消能锥阀。该新阀将原来通过阀体的一股环状射流变为两股互不平行的环状射流,通过这两股高速水流在阀口的碰撞提高消能率、改善流态。采用可压缩的两相流模型,辅以Realizable k–ε湍流模型来模拟锥阀附近水流的水力特性,对于自由水面的处理采用了VOF法,并进行压强场和流速场及消能情况的对比分析。结果显示:在上游进口端控制断面的水流流量相同的情况下使用嵌套式消能锥阀,阀前进水管道的压强可由原来的25kPa减小到15kPa,减小了40%;阀体所承受的压力由35kPa减小到10kPa,减小了57%;下游管道中水流落点之后的沿程断面平均流速减小了约0.1m/s。在上游进口端具有相同的总水头的情况下,嵌套式消能锥阀对流速水头及压强水头的消能能力都要比使用常规消能锥阀好。
The conventional cone cone valve body type is improved, and a new type of nested cone cone valve is proposed. The new valve will be the original body through a ring of jets into two non-parallel annular jet, through the two high-speed flow in the valve port collision energy dissipation to improve and improve the flow. The compressible two-phase flow model and the Realizable k-ε turbulence model are used to simulate the hydraulic characteristics of the water flow near the cone valve. The VOF method is adopted for the treatment of the free water surface, and the comparison between the pressure field, velocity field and energy dissipation analysis. The results show that the necking cone valve can be used under the condition of the same flow rate in the control section of the upstream inlet and the pressure of the water in the pipeline can be reduced from 25kPa to 15kPa and reduced by 40% Of the pressure decreases from 35kPa to 10kPa, a decrease of 57%. The average flow velocity along the downstream section of the downstream pipe decreases by about 0.1m / s. In the case of the same total head at the upstream inlet end, the neutron energy dissipation cone valve has better energy dissipation capacity than the conventional cone valve on the flow head and pressure head.