scholarly journals A Three-Dimensional Turbulent Flow Analysis Method for the Rotating Channels of a Centrifugal Turbomachine

1982 ◽  
Author(s):  
D. A. Fraser ◽  
J. H. G. Howard ◽  
W. C. Lennox
Keyword(s):  
Aspect Ratio ◽  
Turbulent Flow ◽  
Numerical Method ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Center Line ◽  
Analysis Method ◽  
Solution Methods

A three-dimensional turbulent flow analysis method is described based on transformations of the equations to follow an arbitrary curved passage center-line and allowing for passage area and aspect ratio variations. The numerical method is arranged to allow either parabolic or partially parabolic solution methods in the main passage direction. The method has been tested for radial turbomachine elements and comparisons are included with measured internal passage flows in a radial impeller.

A Three-Dimensional Turbulent Flow Analysis Method for the Rotating Channels of a Centrifugal Turbomachine

1983 ◽  
Vol 105 (3) ◽  
pp. 422-429 ◽  
Author(s):  
D. A. Fraser ◽  
J. H. G. Howard ◽  
W. C. Lennox
Keyword(s):  
Aspect Ratio ◽  
Turbulent Flow ◽  
Numerical Method ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Center Line ◽  
Analysis Method ◽  
Solution Methods

A three-dimensional turbulent flow analysis method is described based on transformations of the equations to follow an arbitrary curved passage center-line and allowing for passage area and aspect ratio variations. The numerical method is arranged to allow either parabolic or partially parabolic solution methods in the main passage direction. The method has been tested for radial turbomachine elements and comparisons are included with measured internal passage flows in a radial impeller.

A Comparison of Pull-Out Capacity of Suction Anchors in Clay and Sand

2014 ◽  
Vol 614 ◽  
pp. 613-617
Author(s):  
Jia Qing Du ◽  
Shou Ji Du ◽  
Zhi Wang
Keyword(s):  
Aspect Ratio ◽  
Oil And Gas ◽  
Three Dimensional ◽  
Extreme Environment ◽  
Soil Conditions ◽  
Analysis Method ◽  
Comparison Analysis ◽  
Pull Out ◽  
Rise Rate ◽  
Geological Conditions

With the oil and gas exploitation develop to the deep sea; offshore platform under extreme environment load needs more stable anchorage foundation. Based on the slender suction anchor of SPAR, three-dimensional numerical analysis method was presented to study the ultimate pull-out capacity. Based on the geological conditions from South China Sea, clay and sand was selected as soil conditions to make a comparison analysis. The effects of soil type, load positions, load angles and aspect ratio on the ultimate bearing pull-out resistance of the suction foundation were studied. The comparison analysis results indicated that the ultimate pull-out resistance of suction anchors in sand has a greater rise rate and achieve ultimate pull-out capacity need smaller displacement than in clay; load point and load angles have a great impact on the resistance and there is a critical aspect ratio under inclined loading in sand.

COMBINED EFFECTS OF A GUN PROFILE AND SABOT ON THE STRENGTH OF PENETRATOR

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4517-4522
Author(s):  
JIN-BONG KIM
Keyword(s):  
Aspect Ratio ◽  
Three Dimensional ◽  
Transverse Force ◽  
Principal Factor ◽  
Combined Effects ◽  
Analysis Method ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
Dynamic Finite Element ◽  
Dynamic Finite Element Analysis

As the projectile moves through the gun tube, the gun tube is subjected to a traveling load consisting of the weight of the projectile and a transverse force, probably much greater than the weight, due to the mass of the projectile being constrained to follow a curved path, defined by the shape of the gun tube. This is not simply the curvature of the barrel due to gravity, but the instantaneous value resulting from all the causes of vibration. The gun tube profile and properties of sabot may affects on strength on the penetrator traveling in the gun tube. In addition to these, the aspect ratio of penetrator is also the principal factor for the strength of penetrator. Combined influences of the forward sabot diameter and aspect ratio of penetrator on the strength of penetrator was analyzed using three dimensional dynamic finite element analysis method in the study.

Finite Element Modeling for Steel Cord Analysis in Radial Tires

2013 ◽  
Vol 41 (1) ◽  
pp. 60-79 ◽  
Author(s):  
Wei Yintao ◽  
Luo Yiwen ◽  
Miao Yiming ◽  
Chai Delong ◽  
Feng Xijin
Keyword(s):  
Finite Element ◽  
High Efficiency ◽  
Force Measurement ◽  
Three Dimensional ◽  
Local Stress ◽  
Tension Force ◽  
Center Line ◽  
Element Analysis ◽  
Design Variables ◽  
Steel Cord

ABSTRACT: This article focuses on steel cord deformation and force investigation within heavy-duty radial tires. Typical bending deformation and tension force distributions of steel reinforcement within a truck bus radial (TBR) tire have been obtained, and they provide useful input for the local scale modeling of the steel cord. The three-dimensional carpet plots of the cord force distribution within a TBR tire are presented. The carcass-bending curvature is derived from the deformation of the carcass center line. A high-efficiency modeling approach for layered multistrand cord structures has been developed that uses cord design variables such as lay angle, lay length, and radius of the strand center line as input. Several types of steel cord have been modeled using the developed method as an example. The pure tension for two cords and the combined tension bending under various loading conditions relevant to tire deformation have been simulated by a finite element analysis (FEA). Good agreement has been found between experimental and FEA-determined tension force-displacement curves, and the characteristic structural and plastic deformation phases have been revealed by the FE simulation. Furthermore, some interesting local stress and deformation patterns under combined tension and bending are found that have not been previously reported. In addition, an experimental cord force measurement approach is included in this article.

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