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Outflow of an unexpanded jet into counter supersonic and subsonic flows

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Abstract

The article gives the results of an experimental investigation of the geometric structure of an opposing unexpanded jet. It discusses flow conditions with interaction between the jet and sub- and supersonic flows. It is shown that, with the outflow of an unexpanded jet counter to a supersonic flow, there are unstable flow conditions. For stable flow conditions with one roll, dependences are proposed determining the form of a jet in a supersonic opposing flow. A generalized dependence is obtained for the distribution of the pressure at the surface of a body with a jet, flowing out counter to a subsonic flow. The range of change in the determining parameters are the following: Mach numbers at outlet cross section of nozzle, M a = 1 and 3; Mach numbers of opposing flow, M∞ = 0.6−0.9 and 2.9; degree of effectiveness of jet, n = p a /p∞ = 0.5−800 (p a and p∞ are the static pressures at the outlet cross section of the nozzle and in the opposing flow); the ratios of the specific heat capacities, γ a = γ∞ = 1.4; the drag temperatures of the jet and the flow, To∞ = Toa = 290°K.

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Literature cited

  1. P. J. Finley, “The flow of a jet from a body opposing a supersonic free stream,” J.Fluid Mech.,26, Part 2 (1966).

  2. A. F. Charwat and D. Faulmann, “Investigation of the flow and drag due to control jets discharging upstream into a supersonic flow,” in: Proceedings of the Fifteenth International Astronautical Congress, Warsaw, 1964, Vol. 3, Gauthier Villard, Paris (1965).

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  3. V. S. Avduevskii, A. V. Ivanov, I. M. Karpman, V. D. Traskovskii, and M. Ya. Yudelovich,“Effect of viscosity on the flow in the initial section of a strongly unexpanded jet,” Dokl. Akad. Nauk SSSR,197, No. 1 (1971).

  4. V. S. Avduevskii, A. V. Ivanov, I. M. Karpman, V. D. Traskovskii, and M. Ya. Yudelovich,“Flow in a supersonic viscous unexpanded jet,” Izv. Akad. Nauk SSSR, Mekh. Zhidk.Gaza, No. 3 (1970).

  5. V. A. Sukhnev, “Investigation of flow around and aerodynamic resistance of a body, with a jet directed against a supersonic flow of a rarefied gas,” Izv. Akad. Nauk SSSR, Mekh. Zhidk. Gaza, No. 6 (1973).

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Authors and Affiliations

  1. Moscow

    I. M. Karpman

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  1. I. M. Karpman
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Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 1, pp. 89–96, January–February, 1977.

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Karpman, I.M. Outflow of an unexpanded jet into counter supersonic and subsonic flows. Fluid Dyn 12, 73–79 (1977). https://doi.org/10.1007/BF01074628

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  • DOI: https://doi.org/10.1007/BF01074628

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