THREE DIMENSIONAL FLOW NEAR OBSTACLE WITH TRIANGULAR CROSS SECTION

A solution is obtained for steady, moderately sheared, three-dimensional flow past a wire grid of arbitrary resistance distribution which is placed normal to the axis of a duct of arbitrary but constant cross-section. The formulation presented is an extension of those given by Owen & Zienkiewicz (1957) and Elder (1959) for weakly shared, two-dimensional flow past wire grids. Unlike these earlier formulations, however, in the present study the equations of motion are solved without placing restrictions on the magnitude of variation of resistance across the grid. The resulting solution, taking account of streamline deflexions, is verified experimentally for moderately sheared flow past three grids constructed to produce three widely differing velocity distributions in a water tunnel of circular cross-section.

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Processing of two-dimensional velocity fields for reconstructing three-dimensional flow patterns

Journal of Physics Conference Series ◽

10.1088/1742-6596/2127/1/012031 ◽

2021 ◽

Vol 2127 (1) ◽

pp. 012031

Author(s):

S Yu Belov

Keyword(s):

Cross Section ◽

Cross Sections ◽

Three Dimensional ◽

Velocity Fields ◽

Optical Methods ◽

Two Dimensional ◽

Three Dimensional Flow ◽

Dimensional Flow ◽

Optimal Type

Abstract The paper is concerned with the obtaining three-dimensional velocity fields of a gas or liquid flow based on the available cross-sections of this flow. The descriptions of the main optical methods for studying flows are designed to construct a cross-section of the observed process, but it would be much more informative to obtain information in the visualization not in the cross-section of a volume, but in this volume itself. The paper deals with obtaining three-dimensional flow velocity fields using various approximation methods. The method of estimating the most suitable approximating function is also given. The determination of the optimal type of approximation for the reconstruction of the three-dimensional velocity field was tested on an artificially created vortex.

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Influence of junction angle and flux ratio on three-dimensional flow structure in cross-section of confluence at confluent meander bends

Advanced Engineering and Technology II ◽

10.1201/b18180-30 ◽

2015 ◽

pp. 191-198

Keyword(s):

Flow Structure ◽

Cross Section ◽

Three Dimensional ◽

Flux Ratio ◽

Three Dimensional Flow ◽

Dimensional Flow ◽

Meander Bends ◽

Junction Angle

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Measurement and analysis of three-dimensional flow in a centrifugal fan volute with large volute width and rectangular cross-section

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy ◽

10.1243/095765006x76036 ◽

2006 ◽

Vol 220 (2) ◽

pp. 133-153 ◽

Cited By ~ 6

Author(s):

D Qi ◽

Y Zhang ◽

S Wen ◽

Q Liu

Keyword(s):

Cross Section ◽

Cross Sections ◽

Design Method ◽

Rectangular Cross Section ◽

Three Dimensional ◽

Centrifugal Fan ◽

Three Dimensional Flow ◽

Dimensional Flow ◽

Flow Parameters ◽

Flow Phenomena

Among all the elements of a centrifugal fan, the volute is the one that has the lowest flow efficiency. Therefore, improving the performance of the volute is an efficient way to improve the total performance of a centrifugal fan. To contribute a better understanding of the flow structure in the fan volute, the three-dimensional flow in a centrifugal fan volute with a large volute width and rectangular cross-section has been measured in detail by means of five-hole probe at three different flowrates. The time-average swirling and throughflow velocity, static and total pressure distributions on eight cross-sections in the throughflow direction of the volute are presented. The results show the formation and development of the flow in the fan volute of this type, indicate the variation of flow parameters, and discover some peculiar flow phenomena different from the traditional understanding. On the basis of the experimental results, the main hydraulic losses in this kind of fan volute have been preliminarily classified and analysed. The results show that the traditional one-dimensional design method of the volute should be further improved as it is only based on the law of momentum moment conservation and the ideal assumption that the distribution of flow parameters are uniform at the volute inlet.

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