Abstract
Results of an experimental study of the kinematic structure of flow and the heat transfer in gradient flows are reported. A field measurement method (SIV) was used to obtain profiles of velocities and turbulence characteristics in characteristic sections of diffuser and confuser channels. Based on the results of thermal measurements, the distributions of the heat transfer coefficient on the wall of a flat diffuser/confuser were obtained in a wide range of regime parameters. The mechanisms of the formation of the heat transfer in gradient flows are analyzed. It is shown that, in a diffuser channel, the heat transfer on the wall as a whole depends on the parameters of the flow at the diffuser inlet. For a confuser channel, this relation can be determined using the local values of longitudinal flow velocity.
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References
M.E. Deitch and A.E. Zaryankin, Gas dynamics of diffusers and exhaust pipes of turbomachines, Energia, Moscow, 1970.
V.G. Lushchik and A.I. Reshmin, Intensification of heat-transfer enhancement in a plane separation-free diffuser, High Temperatures, 2018, Vol. 56, No. 4, P. 569–576.
W.M. Kays, D.W. Kearney, and R.J. Moffat, The turbulent boundary layer-experimental heat transfer with strong favorable pressure gradients and blowing, No. NASA-CR-110653, 1970.
M.F. Blair and M.J. Werle, Combined influence of free-stream turbulence and favorable pressure gradients on boundary layer transition and heat transfer, United Technologies Research Center East Hartford Ct., 1981, No. UTRC/R81-914388-17.
E.P. Volchkov, M.S. Makarov, and A.Yu. Sakhnov, Heat transfer in the boundary layer with asymptotic favorable pressure gradient, Inter. J. Heat Mass Transfer, 2012, Vol. 55, P. 1126–1132.
C. Atkinson, A.J. Buchner, M. Eisfelder, V. Kitsios, and J. Soria, Time-resolved PIV measurements of a self-similar adverse pressure gradient turbulent boundary layer, in: 18th Inter. Symp. on the Application of Laser and Imaging Techniques to Fluid Mechanics, Lisbon (Portugal), July 4–7, 2016, Springer-Verlag, London Ltd, 2016, P. 1–13.
R. Hain, S. Scharnowski, N. Reuther, C.J. Kahler, A. Schroder, R. Geisler, and C.H. Atkinson, Coherent large scale structures in adverse pressure gradient turbulent boundary layers, in: 18th Inter. Symp. on the Application of Laser and Imaging Techniques to Fluid Mechanics, Lisbon (Portugal), July 4–7, 2016, Springer-Verlag, London, Ltd, 2016, P. 1–23.
W.J. Devenport and K.T. Lowe, Equilibrium and non-equilibrium turbulent boundary layers, Progress in Aerospace Sci., 2022, Vol. 131, P. 100807–1–100807–50.
I.A. Davletshin, A.N. Mikheev, N.I. Mikheev, and R.R. Shakirov, Heat transfer and structure of pulsating flow behind a rib, Inter. J. Heat Mass Transfer, 2020, Vol. 160, P. 120173–1–120173–11.
I.A. Davletshin, O.A. Dushina, N.I. Mikheev, and R.R. Shakirov, Heat transfer and flow structure in a plane diverging channel, Inter. J. Heat Mass Transfer, 2022, Vol. 189, P. 122744–1–122744–11.
N.I. Mikheev and N.S. Dushin, A method for measuring the dynamics of velocity vector field in a turbulent flow using smoke image-visualization videos, Instruments and Experimental Techniques, 2016, Vol. 59, No. 6, P. 882–889.
P.E. Skaare and P.A. Krogstad, A turbulent equilibrium boundary layer near separation, J. Fluid Mechanics, 1994, Vol. 272, P. 319–348.
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This study was supported by the Russian Science Foundation (Grant No. 22-19-00507).
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Shakirov, R.R., Davletshin, I.A. & Mikheev, N.I. Kinematic structure of flow and the heat transfer in flat diffuser and confuser channels. Thermophys. Aeromech. 29, 759–764 (2022). https://doi.org/10.1134/S08698643220500146
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DOI: https://doi.org/10.1134/S08698643220500146