Numerical simulation of nozzles internal flow fieldof water jet singleside shucking
                                                              HU Jingyan, TAN Jinlin, LI Zhenhua
                （School of Ship and Mechanical and Electrical Engineering,Zhejiang Ocean University, Zhoushan 316022, China）

Abstract: Aiming at the problem of low production efficiency,poor processing environment and low quality of semishell mussel, a new water jet singleside shucking method was introduced and numerical simulation of the water jet processing nozzle was carried out. Twodimensional model of the nozzles internal flow field was established and trellis partition were computed by ICEMCFD software. The velocity, pressure and turbulent energy dissipation rate of the nozzle were calculated choosing the reasonable calculation area and boundary conditions and using the standard kε turbulence model to obtain the best structural parameters of the water jet shelling equipment nozzle with FLUENT. The results indicate that the influence of contraction angle and outlet diameter of the nozzle on the outlet velocity is larger. However, the cylindrical length has little effect on the outlet velocity. When the nozzle contraction angle, outlet diameter and the length of cylindricalsection change, the turbulent energy dissipation rate of the nozzle outlet maintains a constant value on both sides of the axis, and increases sharply at the near wall. The determination of the structure parameters of the nozzle provides important reference value for the development of water jet singleside shucking method.

Key words: water jet; guide plate type fanshapd nozzle; Fluent; numerical simulation; contractionangle; the outletdiameter; the length of the cylindrical section