Novel instantaneous analysis of Pressure –Volume-Temperature gauging method

Abstract

PVT gauging method is simple and reliable to gauge the remaining quantity of cryogenic propellant under microgravity. This paper presents the results of novel analysis of pressure-volume-temperature (PVT) gauging method. Experimental results using LN2 are analysed by a novel PVT gauging analysis which considers all instantaneous changes of pressure and temperature in the ullage volume during a small time interval. It is observed that the gauging error of the novel PVT gaug-ing analysis is within 2.3% at 27-30% liquid levels and within 4.8% at 52-56% and 72-82% liquid levels.