An Experimental Study of Secondary Flow in Jet-driven Vortex Chambers PDF Download
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Author: D. H. Ross
Publisher:
ISBN:
Category :
Languages : en
Pages : 56
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The characteristics of vortex flows in enclosed chambers are strongly influenced by the existence of three-dimensional secondary flows in the endwall boundary layers and in a region near the axis. Classical 'line-vortex' or two-dimensional treatments fail to account for these effects and no theoretical treatment to date has been able to account for all of the complicated interactions. A series of flow visualization experiments was conducted to obtain a qualitative picture of the flow and the effects of changes in geometry and flow parameters. A transparent vortex chamber and selective dye injection into the water-working fluid were utilized. Interest centered on changes in the surface and shape of the end walls and on the exit hole. A form of endwall-boundary-layer slot blowing was effective in altering the secondary flow pattern. An approximate analysis is made to determine the effect of non-planar end-walls on boundary layer radial mass flow, based on the G.I. Taylor result for a conical swirl flow. (Author).
Author: D. H. Ross
Publisher:
ISBN:
Category :
Languages : en
Pages : 56
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Book Description
The characteristics of vortex flows in enclosed chambers are strongly influenced by the existence of three-dimensional secondary flows in the endwall boundary layers and in a region near the axis. Classical 'line-vortex' or two-dimensional treatments fail to account for these effects and no theoretical treatment to date has been able to account for all of the complicated interactions. A series of flow visualization experiments was conducted to obtain a qualitative picture of the flow and the effects of changes in geometry and flow parameters. A transparent vortex chamber and selective dye injection into the water-working fluid were utilized. Interest centered on changes in the surface and shape of the end walls and on the exit hole. A form of endwall-boundary-layer slot blowing was effective in altering the secondary flow pattern. An approximate analysis is made to determine the effect of non-planar end-walls on boundary layer radial mass flow, based on the G.I. Taylor result for a conical swirl flow. (Author).
Author: Coleman DuP. Donaldson
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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Author: Ali Jawarneh
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ISBN:
Category : Fluid dynamic measurements
Languages : en
Pages : 0
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Book Description
This work presents the study of the flow in a jet-driven vortex chamber over a wide range of Reynolds numbers, contraction ratios, inlet angles, area and aspect ratios. Dimensional analysis furnishes the general functional relationships between the fundamental dimensionless quantities. Application of the integral equations of continuity and energy over the control volume, along with the minimum-pressure-drop or maximum flow rate postulate, provide the required analytical means to relate the predominant non-dimensional parameters such as the chamber geometry, the core size, pressure drop, Reynolds number, and viscous losses. Both the n = 2 vortex model, with reverse and non-reverse flow, and the free vortex model have been used at the vortex chamber exit plane. The theoretical results are found to successfully capture most of the salient properties of the flow. The influence of vortex chamber geometry, such as contraction ratio, inlet angle, area ratio, aspect ratio, and Reynolds number, on the flow field has been analyzed and compared with the present experimental data. A parametric study explores how the pressure coefficient and the core size vary with the different dimensionless properties. The observations show the pressure drop to decrease with the length. At first this appears to be counterintuitive since one habitually expects the pressure drop to be larger for longer pipes. A closer examination however, reveals that in addition to the radial-axial plane flow there is also a substantial centrifugal force, which decays with the length, thus shaping the development of the overall flow-field. The pressure drop across the vortex chamber differs from that in pipe flow, due to the mechanism of swirl flow. It depends mainly on intensity of tangential velocity. If the chamber length is increased, the vortex decay factor decreases, which leads to less pressure drop. The current theory confirms that the previous published models are only applicable for high Reynolds numbers where the inertia dominates the viscous forces. Based on the present theory, a new approach to determine the tangential velocity and radial pressure profiles inside the vortex chamber is developed and compared with the available experimental data. The n = 2 vortex model with reverse flow gives better results for strongly swirling flow.
Author: Jet Propulsion Laboratory (U.S.)
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 644
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Author:
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ISBN:
Category : Research
Languages : en
Pages : 244
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Author: United States. Air Force. Office of Aerospace Research
Publisher:
ISBN:
Category :
Languages : en
Pages : 518
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Author: W. S. Lewellen
Publisher:
ISBN:
Category : Vortex-motion
Languages : en
Pages : 236
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author: Los Alamos Scientific Laboratory
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Category : Nuclear propulsion
Languages : en
Pages : 380
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 2180
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