Research On Structure Of Combined Hydraulic Energy Dissipating Device

In the process of oil and gas field exploitation,due to the action of the high-pressure cyclone separator,the sand-containing liquid flows out from the lower drain pipe with huge energy,and the sand and liquid under high pressure will bring unpredictable damage to the pipeline along the gathering.Based on the existing research on different energy dissipation structures,this Paper proposes to install an effective energy dissipation structure or combined energy dissipation device to depressurize the liquid circuit downstream of the high pressure cyclone gas-liquid separator when it is installed in the pipeline system,the pipeline can be operated safely and effectively.In this Paper,the numerical simulation method is used to simulate the combined energy dissipation structure in the tube by Fluent software,and the hydraulic characteristics of the fluid in the tube under different combination arrangements are compared.The best combined hydraulic energy dissipating device structure is obtained.By changing the pitch of the pier and the rotation angle of the pier,the combined devices with 20 different piers are analyzed.Under different Reynolds numbers,the influences on the pressure characteristics,flow field characteristics and energy dissipation characteristics of the energy dissipation structure are obtained.The time-average pressure distribution,pressure distribution cloud map,central axis pressure distribution and cavitation number of each scheme were analyzed,and the influence of these factors on the pressure characteristics was analyzed.The flow field analysis was carried out to obtain the velocity vector diagram,turbulent kinetic energy and turbulent energy dissipation rate of each scheme,and the influence of various factors on the flow field characteristics was analyzed.The energy dissipation efficiency of each scheme was calculated.Through the comparison data analysis,the energy change and energy dissipation mechanism in the combined energy dissipation device were comprehensively analyzed,and the test data was post-processed and analyzed.It is found that when the distance between the piers is300mm and the rotation angle of the teeth is 0°,the combined energy dissipation structure ensures the safe operation of the pipeline while ensuring energy dissipation efficiency and over-flow while the Reynolds number is 3.5×10~6.The structure of the optimal combined energy dissipating device is determined,which provides a basis for future engineering research.