Turbulent Flow in Converging Nozzles Part Ⅰ——Boundary Layer Solution

Reza Maddahian; Bijan Farhanieh; Bahar Firoozabadi

doi:10.3879/j.issn.1000-0887.2011.05.011

Volume 32 Issue 5

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Reza Maddahian, Bijan Farhanieh, Bahar Firoozabadi. Turbulent Flow in Converging Nozzles Part Ⅰ——Boundary Layer Solution[J]. Applied Mathematics and Mechanics, 2011, 32(5): 608-622. doi: 10.3879/j.issn.1000-0887.2011.05.011

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Turbulent Flow in Converging Nozzles Part Ⅰ——Boundary Layer Solution

doi: 10.3879/j.issn.1000-0887.2011.05.011

Center of Excellence in Energy Conversion, School of Mechanical Engineering, Sharif University of Technology, Tehran, P. O. Box: 11365-9567, Iran

Received Date: 2010-06-11
Rev Recd Date: 2010-12-22
Publish Date: 2011-05-15

Abstract

Abstract

In this research the boundary layer integral method was used to investigate the development of turbulent swirling flow at the entrance region of a conical nozzle. The governing equations in the spherical coordinate system were simplified with the boundary layer assumptions and integrated through the boundary layer. The resulting sets of differential equations were then solved by the forth-order Adams predicto-rcorrector method. The free vortex and uniform velocity profiles were applied for tangential and axial velocities at the inlet region respectively. Due to the lack of experimental data for swirling flow in converging nozzles, the developed model was validated against the numerical simulations. The results of numerical simulations demonstrate the capability of the analytical model in predicting boundary layer parameters, such as boundary layer growth, shear rate and boundary layer thickness, as well as the swirl intensity decay rate for different cone angles. The proposed method introduces a simple and robust procedure in order to investigate the boundary layer parameters inside converging geometries.
- swirling flow,
- converging nozzle,
- swirl intensity decay rate,
- boundary layer integral method,
- analytical solution

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References

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