COMPUTER PROGRAMS FOR PRESSURIZATION (RAMP) AND PRESSURIZED EXPULSION FROM A CRYOGENIC LIQUID PROPELLANT TANK

摘要

An analysis to predict the pressurant gas requirements for the discharge of cryogenic liquid propellants from storage tanks is presented, along with an algorithm and two computer programs. One program deals with the pressurization (ramp) phase of bringing the propellant tank up to its operating pressure. The other program deals with the expulsion of the liquid at a uniform pressure. The method of analysis involves a numerical solution of the temper ature and velocity functions for the tank ullage at a discrete set of points in time and space. The input requirements of the program are the initial ullage conditions, the initial temper ature and pressure of the pressurant gas, and the time for the expulsion or the ramp.