Abstract
A high-velocity flow in an axisymmetric nozzle containing a central body and pylons is studied. The influence of the geometry of the main and additional pylons on the gas-dynamic and thrust characteristics at the nozzle exit in the flow regime with \(n_{pr}= 2.25\) (\(n_{pr}\) is the ratio of the pressure in the settling chamber to the ambient pressure) is determined. Azimuthal nonuniformity of the flow at the nozzle exit is detected. The maximum azimuthal nonuniformity is observed in the wake behind the pylons. It is shown that a three-dimensional transonic flow is formed in the nozzle duct with the pylons mounted in the minimum free cross section; local supersonic regions closed by weak shock waves are formed in this flow. It is found that the formation of such a shock wave structure is responsible for nozzle thrust reduction by 12%.
REFERENCES
V. I. Zapryagaev, N. P. Kiselev, and A. A. Pivovarov, “Formation of the Three-Dimensional Structure of a High-Speed Jet Exhausting from a Model Dual-Stream Jet Nozzle," Teplofiz. Aeromekh. 27 (1), 25–35 (2020) [Thermophys. Aeromech. 27 (1), 23–33 (2020)].
S. M. Bosnyakov, A. V. Volkov, A. P. Duben, et al., “Comparison of Two Vortex-Resolving Techniques of Elevated Accuracy on Non-Structured Grids as Applied to Modeling of the Jet Flow from a Bypass Nozzle," Mat. Model. 31 (10), 130–144 (2019).
K. M. Peery and C. K. Forester, “Numerical Simulation of Multistream Nozzle Flows," AIAA J. 18 (9), 1088–1093 (1980). DOI: 10.2514/3.50858.
J. Xiong, P. Nielsen, F. Liu, and D. Papamoschou, “Computation of High-Speed Coaxial Jets with Fan Flow Deflection," AIAA J. 48 (10), 2249–2262 (2010). DOI: 10.2514/1.J050331.
N. H. Sayed, K. L. Mikkelsen, J. E. Bridges “Acoustics and Thrust of Separate-Flow High-Bypass-Ratio Engines," AIAA J. 41 (3), 372–378 (2003). DOI: 10.2514/2.1986.
M. B. Alkislar, A. Krothapalli, W. G. Butler, “The Effect of Streamwise Vortices on the Aeroacoustics of a Mach 0.9 Jet," J. Fluid Mech. 578, 139–169 (2007). DOI: 10.1017/S0022112007005022.
D. Papamoschou,“Fan Flow Deflection in Simulated Turbofan Exhaust," AIAA J. 44 (12), 3088–3097 (2006). DOI: 10.2514/1.22552.
M. O. Cetin, V. Pauz, M. Meinke, and W. Schröder, “Computational Analysis of Nozzle Geometry Variations for Subsonic Turbulent Jets," J. Comput. Fluids 136, 467–484 (2016). DOI: 10.1016/j.compfluid.2016.05.033.
M. O. Cetin, S. R. Koh, M. Meinke, and W. Schröder, “Numerical Analysis of the Impact of the Interior Nozzle Geometry on Low Mach Number Jet Acoustics," Flow Turbulence Combust. 98, 417–443 (2017). DOI: 10.1007/s10494-016-9764-z.
M. E. Deich, Engineering Gas Dynamics (Energiya, Moscow, 1974) [in Russian].
L. I. Sedov, Course in Continuum Mechanics, Vol II: Physical Functions and Formulations of Problems (Nauka, Moscow, 1973; Wolters-Noordhoff, Netherlands, 1972).
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, 2023, Vol. 64, No. 6, pp. 133-143. https://doi.org/10.15372/PMTF20230616.
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Kiselev, N.P., Kavun, I.N., Zapryagaev, V.I. et al. EFFECT OF INTERNAL PYLONS ON THE PARAMETERS OF THE JET FLOW IN A NOZZLE WITH A CENTRAL BODY. J Appl Mech Tech Phy 64, 1058–1067 (2023). https://doi.org/10.1134/S0021894423060160
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DOI: https://doi.org/10.1134/S0021894423060160