Numerical prediction of mixing of four axial rectangular confined jets in the <span style="font-size:14.0pt;line-height:115%;font-family:"Times New Roman","serif"; mso-fareast-font-family:"Times New Roman";color:#181818;mso-ansi-language:EN-IN; mso-fareast-language:EN-IN;mso-bidi-language:HI">presence of an axial central swirling jet</span>

Abstract

This paper is mainly concerned with mixing of four axial rectangular confined jets with a central jet, so as to find the effect of swirl on the flow development. The swirl numbers used are 0, 0.5 and 1.0. The numerical scheme employed is a finite difference procedure using SIMPLE algorithm. For physical modelling, standard two equation <i>k-ε</i> model has been used with modifications to take care of stream line curvature due to swirl. The wall effects have been taken in to account using wall functions. Velocity field, turbulence kinetic energy and length scale have been predicted. The present study reveals that the central swirling jet plays an important role in the mixing and development of recirculation zone. The findings are useful in the application of ramjet and gas turbine combustion systems.