Numerical Investigation Of Swirl Flow Inside A
Supersonic Nozzle
Author(s)
E. Eslamian, H. Shirvani & A. Shirvani
Abstract
This study reports the Computational Fluid Dynamics (CFD) results of a swirling
flow induced by introducing a helical insert inside a supersonic nozzle. The CFD
simulation shows a very complex unsteady, non-axisymmetric flow pattern for
the swirl flow inside the nozzle. The flow is investigated by solving the
Reynolds averaged Navier Stokes (RANS) equations with k- and Reynolds
Stress Model (RSM) turbulence models to predict the flow patterns and the type
of swirling flow. Computations are conducted for a range of nozzle pressure
ratios with and without swirl inside the converging–diverging nozzle. The study
has revealed a new understanding and data for flow features such as shock
location, mass flow rate and anisotropic turbulence.
Keywords: swirl flow, supersonic nozzle, flow separation, CFD.
1 Introduction
Investigation of supersonic flow inside converging–diverging (C–D) nozzles has
been the subject of several numerical and experimental studies in the past [1, 2]
but there is not that much research on the effect of swirl flow inside C–D
nozzles. Swirling flows which are very common in technical applications, such
as turbo machinery, cyclones or separators, and they require sophisticated
modeling.
The effect of swirl inside a nozzle can improve the mixing features of the
flow by increasing turbulence and vorticity in the nozzle, which can be useful in
combustion injectors and sand blast techniques; also swirl flow will change the
shock structure and its interaction with the boundary layer and create a larger
separation zone at the exit of a nozzle. These viscous and compressible
phenomena affect the flow behavior inside and outside of a nozzle. Since
Keywords
swirl flow, supersonic nozzle, flow separation, CFD.
Related Book
Other papers in this volume
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