| Droplet erosion is not only a kind of loss phenomenon while the surface of the material is damaged by the impact of small and loose droplets,but also one of the main forms of surface damage of pneumatic traps.Condensate water in the steam pipe,driven by high-speed steam,cause a strong impact to the valve and steam equipment,resulting in erosion damage,reducing the life of valves and the other equipment.Therefore,it is necessary to study the erosion characteristics of gas-liquid two-phase flow in pneumatic traps and put forward a reasonable approach to reduce the damage of the erosion.In this paper,taking the SY4500 pneumatic traps as the research object,the ICEM software is used to mesh the whole structure of the calculation area while the Eulerian-Lagrangian multiphase particle tracking model and the SST k-w turbulence model is used to simulate in the CFX software.Based on the independent verification of the grid,the running trajectory of the droplet and the surface which is susceptible to be damaged in the valve is analyzed.Based on the simulation of flow field,the explicit dynamic software LS-DYNA is used to analysis the stress and the strain of the the target which is impacted by droplet under the given condition.The erosion resistance of each part of the valve under different working conditions is estimated.Finally,according to the simulation results of the flow field and the dynamic simulation results,a new multi-stage ramp structure is designed to reduce the erosion of the pneumatic traps by reducing the normal velocity of the droplets. |
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