Experiment on drag reduction in axial flow check valve based on separated transition model
YU Jianping1, LUO Xiao1, FU Jia1, ZHANG Xiheng1, ZHENG Rongbu2, CHEN Zongjie2
1.School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Fujian Special Equipment Inspection Research Institute, Fuzhou, Fujian 350008, China
Abstract:Axial flow check valves have been widely used in oil and gas long distance pipelines, compressors in large ethylene equipment and large pumps. The flow resistance reduction in a check valve can play an important role in saving energy in production systems. Traditionally, check valves are designed by using inviscid potential flow theory and optimized by means of the standard turbulence model. In the paper, the RNG k-ε model, transition SST model and transition K-Kl-ω model were adopted to calculate the separation of boundary layer over a blunt axisymmetric body and the skin friction drag. The calculated results were compared with experimental data and it was shown that three models were able to simulate the condition of separation of a boundary layer correctly. The vortex shape predicted by the transition K-Kl-ω model is more close to the experimental result. The traditional RNG k-ε model cannot reflect the transitional process and the change in skin friction drag before and after transition. But the transition SST, K-Kl-ω models, which are based on empirical theory of turbulent intensity both can predict the change in resistance caused from the transition, accordingly the calculated results of them are consistent with the experimental observations. The flow resistance coefficient calculated by the transition K-Kl-ω model is close to the experimental data with a 7% error, suggesting the model is more accurate than the traditional RNG k-ε model. Finally, the transition K-Kl-ω model was used to optimize the structure of an axial flow check valve. The optimized result showed that a smoothly divergent channel can lead to the best effect on drag reduction.
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