Session: 03-09-02 Turbulent Flows (2/3)

Paper Number: 87059

87059 - Comparison of Turbulent Flow Characteristics of Round and Square Oscillating Twin Jets 

This paper is focused on a study of twin self-oscillating jets issuing from a round or square nozzle shape. The jets exit from a submerged nozzle into a thin rectangular cavity at a jet Reynolds number of 27 000 based on nozzle hydraulic diameter and average nozzle exit velocity. A numerical investigation of the three-dimensional incompressible flow is conducted by using an unsteady Reynolds stress turbulence model. The effect of nozzle spacing has been investigated and the time-averaged behavior of the flow has been discussed. The results show that the oscillating square (OS) twin jets have a slightly lower symmetry line streamwise turbulence intensity compared to the oscillating round (OR) twin jets. The lower turbulence intensity is due to an earlier merging of the inner shear layers and a more rapid increase within the merged region of the square jets. The symmetry line streamwise turbulence intensity of both OR and OS twin jets decreases 30% by increasing the distance between the jet nozzles. This decrease is due to a lower interaction between the jets. Comparison of the OR and OS twin jets indicates high Reynolds shear stress in the OS jets, leading to greater mixing for OS twin jets.

Presenting Author: Maziar Mosavati University of Windsor