Influence of non-condensable gases on self-pressurization and thermodynamic control experiments in a tank filled with a liquid and its vapor

[+] Author and Article Information
Samuel MER

Institut de Mecanique des Fluides de Toulouse, UMR5502 - CNRS & INPT & UPS, Toulouse - France

Jean-Paul Thibault

LEGI Laboratory - UMR5519, Univ. Grenoble Alpes & CNRS, Grenoble - France

Christophe Corre

LMFA Laboratory - UMR 5509, Ecole Centrale de Lyon & CNRS, Ecully - France

1Corresponding author.

ASME doi:10.1115/1.4037449 History: Received February 06, 2017; Revised June 28, 2017


A cryogenic propellant submitted to heat load during long duration space missions tends to vaporize to such an extent that the resulting pressure rise must be controlled to prevent storage failure. The Thermodynamic Vent System (TVS), one of the possible control strategies, has been investigated using on-ground experiments with NOVEC1230 as substitution fluid. Results obtained for self-pressurization and TVS control phases have been reported in a previous work. The unexpected inverse thermal stratification observed during these experiments is analyzed in the present work and related tothe influence of non-condensable gases. Non-condensablegases, present inside the tank in the form of nitrogen - 10 times lighter than the substitution fluid vapor - generatea concentration stratification in the ullage. Assuming the NOVEC1230 remains at saturation in the whole ullage, the density stratification which results from this concentration stratification can explain the observed inverse thermal stratification.

Copyright (c) 2017 by ASME
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