Firstly, a plane-radial-flow physical model which is similar to a group five-plot pattern of actual oil field, was built using similarity theory, then a water displacing oil experiment(unsteady state method) was made indoors to measure the quasi-relative permeability of this plane physical medel,and the output of oil and water in four exports was d.

Asymptotic solution for unsteady flow in expanding or contracting channels with large suction Reynolds

The method of CFD and two-dimensional,unsteady flow mathematic model were adopted to compute the inside flow of the filter bag when it was cleaning,offering the distribution of the pressure of cleaning flow.

Typical flow patterns, temperature fields and opening characteristics for the cari-ty during the unsteady flow evolution is given and discussed.