Static characteristics of equilibrium two-phase transpiration cooling systems

The problem is formulated on steady two-phase cooling of a homogeneous porous plate. A close relationship is shown to exist between thermal and hydrodynamic components of the process governed by a nonlinear closed system of differential equations. The laws of filtration movement of a coolant with its phase conversions inside a porous wall are analysed. On the basis of the results obtained from a solution of the system of equations describing two-phase transpiration cooling static characteristics of the process are plotted. These are pressure vs temperature curve in the suggested region of phase conversions, hydrodynamic and thermal characteristics. Investigation of a periodic stability of the process with the use of a set of these characteristics makes it possible to find permissible disturbances of all of the characteristic parameters and reveal peculiarities of steady two-phase transpiration cooling.