Sound speed measurements in liquid oxygen-liquid nitrogen mixtures | Zendy

Allan J. Zuckerwar | Zendy; David S. Mazel | Zendy

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Sound speed measurements in liquid oxygen-liquid nitrogen mixtures

Author(s) -

Allan J. Zuckerwar,

David S. Mazel

Publication year - 1985

Publication title -

the journal of the acoustical society of america

Language(s) - English

Resource type - Journals

eISSN - 1520-8524

pISSN - 0001-4966

DOI - 10.1121/1.2022218

Subject(s) - liquid oxygen , liquid nitrogen , speed of sound , nitrogen , materials science , contamination , miscibility , oxygen , rocket (weapon) , condensation , acoustics , environmental science , analytical chemistry (journal) , composite material , thermodynamics , chemistry , physics , aerospace engineering , environmental chemistry , polymer , ecology , organic chemistry , engineering , biology

The transfer of liquid oxygen (LOX) from a storage vessel to a rocket engine generally requires the use of a pressurizing gas like nitrogen at a typical pressure of 3000 psi. The condensation of gaseous nitrogen to the liquid (LN2), combined with high miscibility, results in contamination of the LOX, which has a deleterious effect on engine performance. It has been proposed to monitor the LOX contamination through sound speed measurements. The purpose of this study is to measure the sound speed of LOX‐LN2 mixtures under controlled conditions and to utilize the results in a practical LOX contamination monitor. The measurements, performed by the pulse‐echo technique on several LOX‐LN2 compositions, reveal a slight deviation from a linear dependence of the sound speed upon the mole fraction of LN2. The results for pure LOX and pure LN2 at − 195.8 °C and 1 atm pressure are 1008.5 ± 0.25% and 852.8 ± 0.32% m/s, respectively, and these are compared to measurements reported in the past.The transfer of liquid oxygen (LOX) from a storage vessel to a rocket engine generally requires the use of a pressurizing gas like nitrogen at a typical pressure of 3000 psi. The condensation of gaseous nitrogen to the liquid (LN2), combined with high miscibility, results in contamination of the LOX, which has a deleterious effect on engine performance. It has been proposed to monitor the LOX contamination through sound speed measurements. The purpose of this study is to measure the sound speed of LOX‐LN2 mixtures under controlled conditions and to utilize the results in a practical LOX contamination monitor. The measurements, performed by the pulse‐echo technique on several LOX‐LN2 compositions, reveal a slight deviation from a linear dependence of the sound speed upon the mole fraction of LN2. The results for pure LOX and pure LN2 at − 195.8 °C and 1 atm pressure are 1008.5 ± 0.25% and 852.8 ± 0.32% m/s, respectively, and these are compared to measurements reported in the past.

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