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Capacitance Mass Sensing of Boiling Propellants
ISSN: 0148-7191, e-ISSN: 2688-3627
Published January 01, 1964 by SAE International in United States
Annotation ability available
No pressurizing gas is introduced into the propellant tanks of the Centaur vehicle during engine firing. The consequent pressure decay causes the propellants to boil, and the resulting gas bubbles change the effective density of the propellants. For liquid hydrogen in the Centaur, this change is 1.4% and would show up as an error in any level sensing propellant utilization system. A perforated capacitance probe shows a net 1/2% error because the bubble population is not the same inside and outside the probe. However, a manometer type capacitance probe senses propellant mass without a bubble induced error. This paper outlines the theoretical background for this effect, and presents the results from medium-scale tests in a general form applicable to vehicles other than Centaur.
CitationPerkins, C. and Wilburn, R., "Capacitance Mass Sensing of Boiling Propellants," SAE Technical Paper 640250, 1964, https://doi.org/10.4271/640250.
- Perkins, C. K. Rivinius, F. G. and Wood, G. B. “Still-wells for Propellant Gaging.” Paper presented at SAE-ASME Air Transport and Space Meeting, New York, April 1964.
- Hsu, Y. Y. “Size Range of Active Nucleation Cavities on a Heating Surface.” ASME Trans. Journal of Heat Transfer (Aug. 1962), 215.
- Harmathy, T. Z. “Velocity of Large Drops and Bubbles in Media of Infinite or Restricted Extent.” AICHE Journal, Vol. 6 (June 1960), 281–288.
- Poutanen, A. A. “Studies of Bubble Formation and Rise.” Canadian Journal of Chemical Engineering, Vol. 38, No. 40 (Aug. 1960), 93–101.
- Tuck, G. “Zero-G Report: LH2 Boiling Threshold.” General Dynamics/Astronautics Report No. 55D859-3 (May 1962).