Chun ZHANG, Wei YU, Baoshou WANG. Flow field characteristics of underwater supersonic over⁃expanded gas jet[J]. Journal of Aerospace Power, 2022, 37(8): 1633-1642.
DOI:
Chun ZHANG, Wei YU, Baoshou WANG. Flow field characteristics of underwater supersonic over⁃expanded gas jet[J]. Journal of Aerospace Power, 2022, 37(8): 1633-1642.DOI: 10.13224/j.cnki.jasp.20210370.
Flow field characteristics of underwater supersonic over⁃expanded gas jet
To investigate the flow field characteristics of underwater supersonic over⁃expanded gas jet,ignition experiment of solid rocket motors using conical nozzles with a large expansion ratio was conducted in the pressure tank.Combined with numerically simulated results obtained by Reynolds⁃averaged Navier⁃Stokes (RANS) and volume of fluid (VOF) model,the interactions between over⁃expanded gas jet and water were analyzed.The results showed that,the over⁃expanded gas jet formed a jet channel in the near depression area of the nozzle,and the length of the core area of the jet decreased with the decrease of drop pressure ratio.Dramatic periodic oscillation changes occurred in the core area of the jet,which was specifically manifested as the high⁃frequency expansion and contraction process.The oscillation frequency increased with the decrease of drop pressure ratio,within a range of 100-200 Hz.The boundary of the jet may constantly oscillate,accompanied by the synchronous change of the shock wave structure.When the degree of overexpansion was larger,the shock wave entered the nozzle to cause the flow separation phenomenon,and the flow separation point moved periodically and reciprocally.The pressure pulsation in the separation area presented the characteristic of high oscillation,but it had no significant characteristic frequency,which was mainly concentrated in the broadband of 100-600 Hz.The simple criterion for underwater flow separation of conical nozzle is that the pressure at the nozzle exit is not less than 0.44 times of the back pressure.
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