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Aimed at ex-situ toughening technology and Z-direction RTM process,Darcy's law was modified by introducing the saturation parameter. The partial differential equation describing the unsteady flow of the resin in the fiber preform was established. The effect of process parameters such as volume flow rate, resin viscosity and fiber preform's permeability during the constant flow process on the injection pressure was investigated. The resin flow between intra-tow and inter-tow of the preform withdoi:10.11868/j.issn.1001-4381.2016.001418 doaj:ebc9a99d5787489eb448c7a524b8dcc6 fatcat:b3g4gwzifbaljpxtdm6ttdbxke