SIMULATION OF THREE-DIMENSIONAL COOLANT FLOW WITHIN TRANSPIRATION NOSETIPS

摘要

STEADY STATE EQUATIONS ARE PRESENTED TO DESCRIBE COOLANT MASS AND ENERGY TRANSFER WITHIN TRANSPIRATION NOSE TIPS. THE ENERGY MODEL, WHICH ASSUMES THERMAL EQUILIBRIUM BETWEEN THE COLLANT AND MATRIX, IS JUSTIFIED ON THE BASIS OF PORE SIZE. AN ITERATIVE COMPUTATIONAL TECHNIQUE IS GIVEN WHICH CAN BE APPLIED TO THE FINITE DIFFERENCE EQUIVALENTS OF THE STEADY STATE EQUATIONS, CAUSING A RELAXATION IN THE PRESSURE AND ENTHALPY FIELDS TO SATISFY THE BOUNDARY CONDITIONS. TO MAINTAIN STABILITY, THE CALCULATIONS MUST BE DAMPED. THE FINAL RESULTS SHOW ISOTHERMAL APPROXIMATIONS TO BE SUBSTANTIALLY IN ERROR FOR HIGH- AND LOW-PRESSURE REENTRY CONDITIONS.