Proceedings of the
International Conference on Mechanical Engineering 2009
(ICME2009) 26-28 December 2009, Dhaka, Bangladesh

ICME09-FM-26

CHARACTERISTICS OF TWIN AXISYMMETRIC FREE JETS

Mohammed A. Azim
Department of Mechanical Engineering, Bangladesh University of Engineering and Technology
Dhaka, Bangladesh

ABSTRACT

Axisymmetric single free jet and twin identical free jets with three nozzle spacing have been investigated numerically. Flow characteristics of single jet, twin jets and two superimposed individual jets are compared, and effect of nozzle spacing on twin jet flows is studied. Turbulence closure in those jet flows was achieved by one equation model. The governing equations were solved by using Implicit θ -Scheme and Tridiagonal Matrix Algorithm. Mean motion augmentation and turbulence attenuation occur on the axis of symmetry of twin jets compare to single jet and two superimposed individual jets. Both converging and combining points of twin jets are found to move downstream with the increase in nozzle spacing. It also appears that increase in nozzle spacing is associated with mean motion attenuation and turbulence augmentation at any axial location of the flows between the nozzle centerlines.

Keywords: Axisymmetric Twin Jets, Numerical Study, Vortex Breakdown.

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