Different Design Aspects of Swirl Jet Using Vortex Generating Jets.

Document Type : Research Studies

Authors

1 Professor of Mechanical Power Engineering, Virginia Polytechnic Institute and State University.

2 Assistant Professor of Mechanical Power Engineering, Virginia Polytechnic Institute and State University.

Abstract

Longitudinal streamwise vortices produced by the interaction of simple round jets with peripheral jets affecting turbulent boundary layer were investigated experimentally. The peripheral jets are used as Swirl Generator Jets (SGJ) for controlling main jets. These jets (SGJ)were pitched up with injection inclination angle of zero, 45 and 90 degree to the tangent direction of the main jet. The ratio of peripheral jet velocity to the free main jet velocity (VR=Ci/Cm) is considered in the range of 0.8 to 1.2 . The comparison of different conditions showed that the vortices produced in the jets are completely controlled by SGJs injection angle and intensity.
Increasing the injection angle was found to increases the growth rate of the main jet.
Image analysis also gave average spatial information about the mass entrainment through the swirl jet. Results of flow visualizations and quantitative measurements are strongly resemble each other.

Main Subjects

MEJ- Mansoura Engineering Journal
Volume 20, Issue 1
VOL 20 has two issues, issue 1 consists of two parts (March & June)
March 1995
Pages 63-78

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