Computational fluid dynamics( CFD) is used to investigate a new type of two-chamber natural gas distributor,which has a natural gas inlet and nine nozzle outlets. The uniformity at the outlet of distributor is practic...Computational fluid dynamics( CFD) is used to investigate a new type of two-chamber natural gas distributor,which has a natural gas inlet and nine nozzle outlets. The uniformity at the outlet of distributor is practice proven to have significant degree influence on its comprehensive performance. To improve the uniformity at the nozzles of the gas distributor,CFD modeling with the RNG k-ε turbulence model is undertaken to understand the mass flow rate of nozzles with reference to different length of chambers and the most optimal length is obtained. The internal flow pattern of the natural gas distributor is analyzed. It is found that the local maximum deviation of the nozzle outflow rate increases with the increase of chambers length when the length is more than 64 mm. The results provide useful suggestions for the optimal design of two-chamber natural gas distributor.展开更多
The movement of bottom high-sediment sea water under water waves,especially that of the high-sediment water layer close to the sea bottom,is important to the resuspension and settlement of sediment.Supposing that the ...The movement of bottom high-sediment sea water under water waves,especially that of the high-sediment water layer close to the sea bottom,is important to the resuspension and settlement of sediment.Supposing that the high-sediment sea water is a Newtonian fluid,based on Navier-Stokes(N-S)theory,the movement of the interfaces of air-water and water-sediment water was tracked by the volume of fluid(VOF)method.The velocity field of sediment water was simulated by considering the effect of water waves.The results show that the movement of sediment water is very different from that of sea water,which provides a solid basis for understanding the resuspension and settlement of sediment and the formation of bottom stripe,and the VOF method can trace the movement of the two interfaces simultaneously;the movement of the air-water interface has a strong effect on that of the water-sediment water interface,while the effect of the water-sediment water interface movement on the air-water interface is not obvious.展开更多
基金Sponsored by the Beijing Key Lab of Heating,Gas Supply,Ventilating and Air Conditioning Engineering(Grant No.NR2013K04)the Higher School Science and Technology Development Fund of Tianjin(Grant No.20130909)
文摘Computational fluid dynamics( CFD) is used to investigate a new type of two-chamber natural gas distributor,which has a natural gas inlet and nine nozzle outlets. The uniformity at the outlet of distributor is practice proven to have significant degree influence on its comprehensive performance. To improve the uniformity at the nozzles of the gas distributor,CFD modeling with the RNG k-ε turbulence model is undertaken to understand the mass flow rate of nozzles with reference to different length of chambers and the most optimal length is obtained. The internal flow pattern of the natural gas distributor is analyzed. It is found that the local maximum deviation of the nozzle outflow rate increases with the increase of chambers length when the length is more than 64 mm. The results provide useful suggestions for the optimal design of two-chamber natural gas distributor.
基金The authors were grateful to the support of the Open Research Fund Program of State Key Laboratory of Water Resources and Hydropower Engineering Science(No.2005B017).
文摘The movement of bottom high-sediment sea water under water waves,especially that of the high-sediment water layer close to the sea bottom,is important to the resuspension and settlement of sediment.Supposing that the high-sediment sea water is a Newtonian fluid,based on Navier-Stokes(N-S)theory,the movement of the interfaces of air-water and water-sediment water was tracked by the volume of fluid(VOF)method.The velocity field of sediment water was simulated by considering the effect of water waves.The results show that the movement of sediment water is very different from that of sea water,which provides a solid basis for understanding the resuspension and settlement of sediment and the formation of bottom stripe,and the VOF method can trace the movement of the two interfaces simultaneously;the movement of the air-water interface has a strong effect on that of the water-sediment water interface,while the effect of the water-sediment water interface movement on the air-water interface is not obvious.
