Effects of Using Ribs on Flow Pattern and Performance of Cyclone Separators

Inlet is one of the basic elements of squirrel cage fan that can have great effect on performance and losses, especially between inlet exit and first section of impeller width. In this paper the effect of axial gap between inlet diffuser and impeller on performance and flow pattern is considered. Three diffuser inlet sizes with respect to impeller size (smaller, nearly same and bigger than inner impeller diameter) and three axial gaps within the available dimensions of the casing and impeller were chosen. Numerical simulations were performed to find the effect of this axial gap on flow pattern, performance and efficiency. From the simulation of each case study, flow pattern and its mechanism and the causes that affecting the efficiency and performance due to axial gap are analyzed and presented.

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A Study on the Blade Shape Influence on Flow Distribution and Performance in Centrifugal Compressor Rotors

Volume 1: Turbomachinery ◽

10.1115/90-gt-099 ◽

1990 ◽

Cited By ~ 1

Author(s):

Raffaele Tuccillo ◽

Adolfo Senatore

Keyword(s):

Flow Pattern ◽

Boundary Layers ◽

Centrifugal Compressor ◽

Flow Distribution ◽

Aircraft Engine ◽

Pressure Losses ◽

Compressor Rotor ◽

Blade Shape ◽

Shape Influence ◽

And Performance

The authors present an analysis of the flow through a centrifugal compressor rotor. A quasi-3D flow model evaluates the interaction of the meridional and blade-to-blade solution, so as to determine the flow pattern inside an inviscid region. A further interaction is then considered between the non-viscous flow and the boundary layers which grow along the end-walls and the blade surfaces. This makes it possible both to determine a more realistic flow condition, because of the blockage effects exerted by the boundary layers, and to estimate the total pressure losses related to the momentum thickness. Examples are presented for a compressor of an aircraft engine. The influence of blade shape on the above described phenomena is analyzed, starting from the actual rotor geometry and making a parametric study of the alterations in flow pattern produced by changes in meridional blade shape, inlet and outlet flow areas, and splitter blades. The analysis will provide a basis for future activities involving the use of optimizing techniques for the final choice of the blade characteristics.

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Design and Validation of New Exhaust Manifold for 3.8 L Turbocharged-Intercooled Diesel Engine

Heat Transfer, Volume 1 ◽

10.1115/imece2006-15846 ◽

2006 ◽

Author(s):

Tejsing A. Gaikwad

Keyword(s):

Thermal Analysis ◽

Diesel Engine ◽

Pressure Drop ◽

Experimental Method ◽

Flow Pattern ◽

Comparative Method ◽

Exhaust Manifold ◽

Degree Polynomial ◽

Profile Design ◽

And Performance

Few Engine Layout and Performance related concerns made way for design and development of new Exhaust Manifold (EM). New EM is designed using 5th degree Polynomial Profile Design (PPD) technology. Existing EM is tested to measure various parameters such as flow pattern, pressure drop across manifold and on skins temperature mappings. Two approaches were studied to validate new EM on the basis of results obtained by CFD and Thermal Analysis as follows, 1. Comparative Method. 2. Experimental Method. The paper aims at presenting the above design and validation approaches for upcoming EM designs.

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