CALCULATION OF THE END PLATES FRICTIONAL RESISTANCE EFFECT ON THE FLAT JET DYNAMICS
DOI:
https://doi.org/10.31489/2020No1/85-90Keywords:
three-dimensional jet, flat jet, end plates, frictional resistance, boundary layerAbstract
This article is a continuation of scientific research on the calculation of the effect of friction resistance of end plates on the aerodynamics of a flat jet. In the previous works, the resistance was calculated for a turbulent boundary layer. This paper shows the results of calculating the effect of friction resistance of end plates on the patterns of development of a flat free jet. A flow diagram of the jet between the end surfaces has been constructed. The resistance calculation for the laminar boundary layer has been carried out. The formula for calculation of the change in the maximum jet velocity in a first approximation has been derived. The comparison of the theoretical calculations with the experimental data has shown a good agreement.
References
"1 Abramovich G.N., Girshovich T.A, Krasheninnikov S.I., Sekundov A.N., 1 Smirnova I.P. The Theory of Turbulent Jets. The MIT Press, Cambridge, Massachusetts, 1984, 684p.
Quinn W.R.Turbulent free jet flows issuing from sharp-edged rectangular slots: the influence of slot aspect ratio. Exp. Thermal Fluid. Sci.1992, No.5, pp. 203 – 215.
Faghani E., Maddahian R., Faghani P., et al. Numerical investigation of turbulent free jet flows issuing from rectangular nozzles: the influence of small aspect ratio. Archiv. Appl. Mech., 2010, No. 80(7), pp. 727 – 745.
Inguva, V., Graceffa, R., Schulz, J., Bilsel, O., Perot, B.J. Creating round focused micro-jets from rectangular nozzles. Journal of Mechanical Science and Technology. 2019, Vol. 33, Issue 9, pp.4281 – 4289.
Hao, W.U., Yongpeng, O., Qing, Y.E. Experimental study of air layer drag reduction on a flat plate and bottom hull of a ship with cavity. Ocean Engineering.2019, Vol 183, pp. 236 – 248.
Isataev S., Toleuov G., Isataev M., Ospanova Sh., Bolysbekova Sh. Impact of frictional resistance of end plates on flat jet attenuation. Journal of engineering and applied Sciences. 2015, No.10, pp. 76 – 79.
Lhendup Namgyal and Hall Joseph W. Coherent streamwise vortex structures in the near-field of the three-dimensional wall jet. J. Fluid Eng. 2013, No. 135(6), pp. 120 – 126.
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