Distributed parameter numerical simulation for the transients of cryogenic propellant tank pressurization system(Ⅰ)Finite volume model of tank

Based on the finite volume model of quasi one-dimensional compressible transient pipe flow,a distributed parameter numerical model of cryogenic propellant tank was established by numerical development and integration in which the heat transfer between fluid and tank wall was considered.Two kinds of finite volume grids,which are interlaced in discrete space,were employed to establish the flow field model which can consider actions derived from variable fluid properties,axial heat conductivity,gravity and wall heat transfer.Two-dimensional finite control volume grids in axisymmetric cylindrical coordinates were employed to establish the temperature field model which could deal with two boundary heat transfer conditions including convection and radiation.Variable thermophysical properties of wall material and multilayer or vacuum sandwich structure of tank wall were also considered.The model comprehensively describes the distributed parameter effect in tank and is valuable in tank pressurization simulation field.