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Investigation of Flow Inside the Pressure Swirl Atomizer
, Ph.D. Dissertation Sharif University of Technology ; Nouri Boroujerdi, Ali (Supervisor)
Abstract
In the present work, the behavior of flow inside the pressure-swirl atomizers (PSA) is studied by the numerical simulation. The pressure-swirl atomizer is widely used in many industrial applications such as fuel injection in gas turbine, internal combustion engine and liquid-fuel rocket, spray drying, spray in firing and agricultural nozzles.
The flow simulation inside the injector (PSA) deals with many complicated considerations due to air core formation in the axial zone of the injector as well as high tangential and axial velocities in the swirl chamber. The two phase flow is modeled by level set methods in the pressure swirl atomizer. Moreover, the explicit algebraic Reynolds stress...
The flow simulation inside the injector (PSA) deals with many complicated considerations due to air core formation in the axial zone of the injector as well as high tangential and axial velocities in the swirl chamber. The two phase flow is modeled by level set methods in the pressure swirl atomizer. Moreover, the explicit algebraic Reynolds stress...
Numerical Investigation on the Effects of Guide Vanes in Quasi-Radial Wall Jet for Improvement of Separation Control
, M.Sc. Thesis Sharif University of Technology ; Javadi, Khodayar (Supervisor)
Abstract
The aim of this study was the performance analysis of the effect of guide vanes in a quasi-radial wall jet to improve the flow separation control on the wing composed of NACA4415. In order to achieve this goal, first, by examining two geometries of "quasi-radial wall jet" and "arced-shape wall jet", the effect of jet's internal flow on separation control improvement has been studied and arced-shape wall jet has been chosen as a suitable replacement for the uniform quasi-radial wall jet, which has changed the radial velocity distribution of the jet output from uniform to non-uniform. Also, increasing the radial component of the jet output velocity and improving the separation control have...
Turbulent flow in converging nozzles, part one: Boundary layer solution
, Article Applied Mathematics and Mechanics (English Edition) ; Volume 32, Issue 5 , 2011 , Pages 645-662 ; 02534827 (ISSN) ; Farhanieh, B ; Firoozabadi, B ; Sharif University of Technology
2011
Abstract
The boundary layer integral method is used to investigate the development of the turbulent swirling flow at the entrance region of a conical nozzle. The governing equations in the spherical coordinate system are simplified with the boundary layer assumptions and integrated through the boundary layer. The resulting sets of differential equations are then solved by the fourth-order Adams predictor-corrector method. The free vortex and uniform velocity profiles are applied for the tangential and axial velocities at the inlet region, respectively. Due to the lack of experimental data for swirling flows in converging nozzles, the developed model is validated against the numerical simulations. The...