Numerical Simulation on Flow Field of Diameter-reduced Valve in Low-concentration Coal-bed Methane Liquefaction
LIU Ling
LIU Liya
FU Yaoguo
GAN Hailong
Abstract：In this paper,the method of computational fluid dynamics was adopted,the two-equation model with k-εwas used to close the N-S equation,the structure of the diameter-reduced valve was reasonably simplified,and numerical simulation was made on the flow field,the flow stability of fluid and the local resistance coefficient of the diameter-reduced valves with different taper angle and size which were installed in the pipeline of the cryogenic liquefaction equipment of low-concentration coal-bed methane . The simulated results showed that when the angle of the diameter-reduced valve was equal to or larger than 50 o ,the fluid was seriously divorced from the boundary layer,the fluid flow produced vortex,and the diameter-reduced valve had a poor fluid-passing characteristic;under the same conditions,the local resistance coefficient increased with the increase of the taper angle of the diameter-reduced valve. The simulated results can provide reference for the selection of the valves used in the engineering pipeline.
Keywords：low-concentration coal-bed methanediameter-reduced valvelocal resistance coefficientnumerical simulation
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 41-43,47 )