Authors:Bouaraour Kamel,Lalmi Djemoui,
Keywords:flow interaction,merge point,combined point,turbulence model,
AbstractThis paper, reports the numerical results of the turbulent flow characteristics and turbulent quantities when a triangular object is placed at the exit of two nozzles. The fluid flow at the entrance of the nozzles is considered isothermal and incompressible. Three turbulence k-ε models are used to study the jets interaction and its resulting characteristics. The numerical method is first validated with the available experimental results for a configuration where no object is placed between nozzles. Numerical simulations are carried out for fixed turbulence intensity at the nozzles exit (3%), and for Reynolds numbers varied from 2.103 to 104. Results reveal that the existence of a solid object between the dual jets affects the location of the merge and combined points. The merge point is pushed downstream of the flow, and the corresponding axial velocity of the combined point is reduced for all Reynolds numbers. The turbulent kinetic energy field is also affected, either in the near field or in the far field for all Reynolds numbers. We have concluded also that the Realizable k-ε model overestimates velocity and turbulent kinetic energy fields compared to the other models.
I. Abbasalizadeh M., Jafarmadar S. and Shirvani H., “The effects of pressure difference in nozzle’s two phase flow on the quality of exhaust mixture”, International Journal of Engineering Transactions B: Applications, vol. 26, no. 5, pp: 553-562, 2013.
II. Anderson E. A. and Spall R. E., “Experimental and numerical investigation of two-dimensional parallel jets”, Transactions of ASME, Journal of Fluids Engineering, vol. 123, no. 2, pp: 401-406, 2001.
III. Azim M. A., “Characteristics of twin axisymmetric free jets”, Proceedings of the international Conference on Mechanical Engineering, Bangladesh, 2009.
IV. Boussoufi M., Sabeur-Bendehina A., El Ganaoui M., Morsli S. and Ouadha A., Numerical simulation of the flow field analysis in the mixing twin jets, Energy Procedia, vol. 139, pp: 161-166, 2017.
V. Elbanna H., Sabbagh J. A. and Rashed M. I. I, “Interception of two equal turbulent jets”, AIAA Journal, vol. 23, no. 7, pp: 985-986, 1985.
VI. Elbanna H., Gahin S. and Rashed M. I. I., “Investigation of two plane parallel jets”, AIAA Journal, vol. 21, no. 7, 986-991, 1983.
VII. Erdem D. and Ath V., “Interaction of two parallel rectangular jets”, 23rd International Congress of Aeronautical Sciences, Canada, 2002.
VIII. Gao J., Xu X. and Li X., “Numerical simulation of supersonic twin-jet noise with high-order finite difference scheme”, AIAA Journal, vol. 56, no. 1, pp: 290-300, 2018.
IX. Hnaien N., Marzouk Khairallah S., Ben Aissia H and Jay J, “Numerical study of interaction of two plane parallel jets”, International Journal of Engineering TRANSACTIONS A: Basics, vol. 29, no. 10, pp: 1421-1430, 2016.
X. Karnam A., Baier F., Gutmark E. J., Jeun J., Wu G. J. and Lele S. K., “An investigation into flow field interactions between twin supersonic rectangular jets”, AIAA Scitech forum, January 2021.
XI. Kwon S. J. and Seo I. W., “Reynolds number effects on the behavior of a non-buoyant round jet”, Experiments in Fluids, vol. 38, no. 6, pp: 801-812, 2005.
XII. Lin Y. F. and Sheu M. J., “Interaction of parallel turbulent plane jets”, AIAA Journal, vol. 29, no. 9, pp: 1372-1373, 1991.
XIII. Lin Y. F. and Sheu M. J., “Investigation of two plane parallel unventilated jets”, Experiments in Fluids, vol. 10, no. 1, pp: 17-22, 1990.
XIV. Mi J. and Nathan G. J., “Statistical properties of turbulent free jets issuing from nine differently-shaped nozzles”, Flow, Turbulence and Combustion, vol. 84, pp: 583-606, 2010.
XV. Naseri Oskouie R., Tachie M. F. and Wang B. C., “Effect of nozzle spacing on turbulent interaction of low-aspect-ratio twin rectangular jets”, Flow, Turbulence and Combustion, vol. 103, no. 2, pp: 323, 2019.
XVI. Nasr A. and Lai J. C. S., “Two parallel plane jets: mean flow and effects of acoustic excitation”, Experiments in Fluids, vol. 22, no. 3, pp: 251-260, 1997.
XVII. Pandey K. M. and Kumar V., “CFD analysis of four jet flow at Mach 1.74 with Fluent software”, International Journal of Environmental Science and Development, vol. 1, no. 5, pp: 423-428, 2010.
XVIII. Pandey K. M., Kumar V. and Srivastava P., “CFD analysis of twin jet supersonic flow with Fluent software”, Current Trends in Technology and Sciences, vol. 1, no. 2, pp: 84-91, 2012.
XIX. Patankar S. V., Numerical heat transfer and ﬂuid ﬂow, Mac Graw Hill, New York, 1980.
XX. Shih T. H., Liou W. W., Shabbir A., Yang Z. and Zhu J., A new k-ε eddy viscosity model for high Reynolds number turbulent flows, Computer and Fluids, vol. 24, no. 3, pp: 227-238, 1995.
XXI. Sourav S., Hossain Rifat A. and Taher Ali M. A., “Effects of Reynolds number on twin circular jets at a small space ratio”, International Journal of Research and Scientific Innovation, vol. 7, no. 8, pp: 248-252, 2020.
XXII. Spall R. E., Numerical study of buoyant plane parallel jets, Journal of Heat Transfer, vol. 124, no. 6, pp: 1210-1212, 2002.
XXIII. Tanaka E., “Experiments on the combined flow of dual jet: the interference of two-dimensional parallel jets”, Bulletin JSME, vol. 17, no. 109, pp: 920- 927, 1974.
XXIV. Tanaka E., “The interference of two dimensional parallel jets”, Bulletin JSME, vol. 13, no. 56, pp: 272-280, 1970.
XXV. Tenchine D. and Moro J. P., “Experimental and numerical study of coaxial jets”, Proceedings of the 8th Int topical meeting on nuclear reactor thermal-hydraulics, Japan, vol. 3, pp: 1381-1387, 1997.
XXVI. Wang C. S., Lin Y. F. and Sheu M. J., “Measurements of turbulent inclined plane dual jets”, Experiments in Fluids, vol. 16, no. 1, pp: 27-35, 1993.
XXVII. Zheng X., Jian X., Wei J. and Wenzheng D., “Numerical and experimental investigation of near-field mixing in parallel dual round jets”, International Journal of Aerospace Engineering, vol. 1, pp: 1-12, 2016.