The crystal plugging of tunnel drainage pipe seriously affects the safe and
normal use of the tunnel. In order to obtain the mechanism of flocking
drainage pipe anti crystal plugging based on the characteristics of flow
field distribution, numerical simulation was used to optimize the parameters
of flocking drainage pipe. The results show that: with the existence of
fluff, the velocity in the lower part of the drainage pipe decreases by
about 50%, and the velocity in the upper part increases by about 25~50%.
With the increase of the length of fluff, the velocity funnel between
fluffs gradually increases, the velocity distribution at the bottom of the
funnel is basically unchanged, and the velocity in the upper part gradually
increases. The velocity in the upper part of the flocked drainage pipe
fluctuates above the fluff to a certain extent. The flow velocity in the
lower part of the drainage pipe forms a flow velocity ladder in the
longitudinal direction of the villus, and the width of the ladder is about
2/3 of the longitudinal spacing of the villus. The optimized parameters of
3-D flow field of flocked drainage pipe are helpful to the further
improvement of indoor test, and provide theoretical basis for the mechanism
of preventing crystal blockage of flocked drainage pipe.
Two-dimensional flow field distribution characteristics of flocking drainage pipes in tunnel
