The features of spontaneous condensation of boron oxide in plane and axisymmetric nozzles: numerical analysis
- Authors: Savel’ev A.M.1, Babushenko D.I.1, Savelieva V.A.1
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Affiliations:
- P.I. Baranov Central Institute of Aviation Motors
- Issue: Vol 15, No 3 (2022)
- Pages: 51-62
- Section: Articles
- URL: https://ogarev-online.ru/2305-9117/article/view/286551
- DOI: https://doi.org/10.30826/CE22150306
- EDN: https://elibrary.ru/JDYUJO
- ID: 286551
Cite item
Abstract
A model of spontaneous condensation of boron oxide vapors in chemically reacting gas mixtures based on the classical theory of nucleation and one-speed and one-temperature approximation for the equations of a two-phase mixture movement has been developed. The model takes into account the nucleation, condensation growth of droplets, their coagulation, and gas-phase chemical reactions. A numerical study of spontaneous condensation of boron oxide vapors in plane and axisymmetric nozzles has been performed. The condensation in flat nozzles with a small degree of expansion is shown to proceed according to a typical scenario: the formation of a condensation shock wave behind the nozzle throat and the condensation growth of droplets downstream after the jump. In the flat nozzles of similar geometry with the small expansion angle, the location of the condensation shock wave does not depend on the linear dimensions of the nozzle. An important feature of spontaneous condensation in nozzles with a small expansion angle is the equilibrium of vapor and condensate in the outlet section of the nozzle. Phase equilibrium is not achieved in nozzles with a high expansion angle. The higher the expansion angle of the nozzle supersonic part, the greater the deviation from equilibrium in nozzle.
Keywords
About the authors
Alexander M. Savel’ev
P.I. Baranov Central Institute of Aviation Motors
Author for correspondence.
Email: amsavelev@ciam.ru
Candidate of Science in technology, head of sector
Russian Federation, MoscowDenis I. Babushenko
P.I. Baranov Central Institute of Aviation Motors
Email: dibabushenko@ciam.ru
head of sector
Russian Federation, MoscowVera A. Savelieva
P.I. Baranov Central Institute of Aviation Motors
Email: vasaveleva@ciam.ru
Candidate of Science in biology, senior research scientist
Russian Federation, MoscowReferences
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