FLUID AND STRUCTURAL ANALYSIS OF A LARGE DIAMETER BUTTERFLY VALVE

2009 ◽  
Vol 08 (01) ◽  
pp. 81-88 ◽  
Author(s):  
XUE GUAN SONG ◽  
LIN WANG ◽  
YOUNG CHUL PARK
Keyword(s):  
Structural Analysis ◽  
Large Diameter ◽  
Flow Coefficient ◽  
Three Dimensions ◽  
Butterfly Valve ◽  
Inlet Velocity ◽  
Fluid Analysis ◽  
Commercial Package ◽  
Valve Disc ◽  
Testing Experiment

A butterfly valve of large diameter is commonly used as control equipments in applications where the inlet velocity is fast and the pressure is relatively high. Because the size of the valve is too large, it's too difficult to conduct testing experiment in a laboratory. In this paper, the numerical simulation using commercial package-CFX and ANSYS was conducted. In order to perform fluid analysis and structural analysis perfectly, large valve models are generated in three dimensions without much simplification. The result of fluid analysis is imported to structure analysis as a boundary condition. In addition, to describe the flow patterns and to measure the performance when valve are opened for various angles, the verification of the performance whether the valve could work safely at these different conditions or not was conducted. Fortunately, the result shows that the valve is safe in a given inlet velocity of 3 m/s, and it's not necessary to be strengthened anywhere. In the future, the shape of valve disc can be optimized to reduce the weight, and also to make the flow coefficient be closer to the suggested level.

scholarly journals Effect Analysis of Design Variables on the Disc in a Double-Eccentric Butterfly Valve

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Sangmo Kang ◽  
Da-Eun Kim ◽  
Kuk-Kyeom Kim ◽  
Jun-Oh Kim
Keyword(s):  
Pressure Drop ◽  
Maximum Stress ◽  
Optimal Combination ◽  
Three Dimensions ◽  
Butterfly Valve ◽  
Effect Analysis ◽  
Performance Simulation ◽  
Design Variables ◽  
Commercial Package ◽  
Simulation Results

We have performed a shape optimization of the disc in an industrial double-eccentric butterfly valve using the effect analysis of design variables to enhance the valve performance. For the optimization, we select three performance quantities such as pressure drop, maximum stress, and mass (weight) as the responses and three dimensions regarding the disc shape as the design variables. Subsequently, we compose a layout of orthogonal array (L16) by performing numerical simulations on the flow and structure using a commercial package, ANSYS v13.0, and then make an effect analysis of the design variables on the responses using the design of experiments. Finally, we formulate a multiobjective function consisting of the three responses and then propose an optimal combination of the design variables to maximize the valve performance. Simulation results show that the disc thickness makes the most significant effect on the performance and the optimal design provides better performance than the initial design.

Differences in the brain stem terminations of large- and small-diameter vestibular primary afferents

1995 ◽  
Vol 74 (3) ◽  
pp. 1362-1366 ◽  
Author(s):  
J. A. Huwe ◽  
E. H. Peterson
Keyword(s):  
Brain Stem ◽  
Large Diameter ◽  
Small Diameter ◽  
Movement Control ◽  
Three Dimensions ◽  
Significant Shift ◽  
Axon Diameter ◽  
Vestibular Complex ◽  
The Brain ◽  
Adjacent Brain

1. We visualized the central axons of 32 vestibular afferents from the posterior canal by extracellular application of horseradish peroxidase, reconstructed them in three dimensions, and quantified their morphology. Here we compare the descending limbs of central axons that differ in parent axon diameter. 2. The brain stem distribution of descending limb terminals (collaterals and associated varicosities) varies systematically with parent axon diameter. Large-diameter afferents concentrate their terminals in rostral regions of the medial/descending nuclei. As axon diameter decreases, there is a significant shift of terminal concentration toward the caudal vestibular complex and adjacent brain stem. 3. Rostral and caudal regions of the medial/descending nuclei have different labyrinthine, cerebellar, intrinsic, commissural, and spinal connections; they are believed to play different roles in head movement control. Our data help clarify the functions of large- and small-diameter afferents by showing that they contribute differentially to rostral and caudal vestibular complex.

Numerical Simulation and Experimental Research of a New Butterfly Valve

2012 ◽  
Vol 212-213 ◽  
pp. 1255-1260 ◽  
Author(s):  
Yang Wang ◽  
Ying Zhu ◽  
Xin Rong Shen ◽  
Jian Feng Ma
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Linear Relationship ◽  
Experimental Research ◽  
Three Dimensional ◽  
Flow Coefficient ◽  
Butterfly Valve ◽  
Valve Opening ◽  
Research And Design ◽  
Relative Flow

The paper proposes an idea of projection weighted area in designing a new control butterfly valve. A lot of three-dimensional numerical simulations are carried out on the new valve, and the numerical simulations give a good linear relationship between relative flow coefficient and relative valve opening. An experiment setup was established to verify the results of numerical simulations, and the results show that the CFD technology to research and design the new valve plate is entirely feasible.

The Effects Produced by a Butterfly Valve in a Hydraulic Closed Circuit

2015 ◽  
Vol 811 ◽  
pp. 117-121
Author(s):  
Lucian Mândrea ◽  
Corina Cipu ◽  
Corina Băbuţanu ◽  
Gabriela Oprina
Keyword(s):  
Flow Rate ◽  
Pressure Loss ◽  
Volumetric Flow Rate ◽  
Water Velocity ◽  
Flow Coefficient ◽  
Closed Circuit ◽  
Butterfly Valve ◽  
Local Pressure ◽  
Pressure Transducers ◽  
Average Water

The paper presents the operation of a hydraulic closed circuit equipped with a butterfly valve which can close with a step of 10o. Using four pressure transducers and one temperature transducer, the authors determined the volumetric flow rate, the average water velocity and the local pressure loss in the butterfly valve, the flow coefficient Kv and also the incipient cavitation coefficient. Recommendations for the disposal of the butterfly valve are made and conclusions are obtained regarding the range of opening degrees in which the butterfly valve is better to be used.

Sloshing Analysis Method Using Existing FEM Structural Analysis Code

1995 ◽  
Vol 117 (3) ◽  
pp. 268-272 ◽  
Author(s):  
N. Tokuda ◽  
T. Sakurai ◽  
T. Teraoku
Keyword(s):  
Wave Equation ◽  
Structural Analysis ◽  
Excellent Agreement ◽  
Theoretical Consideration ◽  
Pressure Wave ◽  
Present Method ◽  
Gravitational Force ◽  
Analysis Method ◽  
Fluid Analysis ◽  
Elasticity Equations

A fluid analysis method using an analogy relating the pressure wave equation of fluid to elasticity equations is applied to sloshing analysis, where existing FEM structural analysis codes are available. It is seen from theoretical consideration that the present method is equivalent to the classical FEM formulation of linear sloshing analysis. The numerical analyses of liquid sloshing in a rigid cubic tank and of vibration of tubulous fluid under gravitational force are performed by using the present method. The results are shown to be in excellent agreement with the theoretical values.

Investigation on Flow Characteristics and Stability of Control Valves for Steam Turbines

2008 ◽  
Author(s):  
Guanwei Liu ◽  
Shunsen Wang ◽  
Hui Guo ◽  
Jingru Mao ◽  
Zhenping Feng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Pressure Ratio ◽  
Control Valve ◽  
Operating Conditions ◽  
Flow Coefficient ◽  
Outlet Section ◽  
Steam Turbines ◽  
Control Valves ◽  
Structure Of Flow ◽  
Valve Disc

Through-flow capability and flow stability of some steam turbine control valves were studied by experimental investigation and numerical simulation. Based on the analysis of thermodynamic process in control valve, the relationship of flow coefficient, area ratio of valve outlet section to seat diameter section, pressure ratio and total pressure loss coefficient was deduced, and the expression of polytropic exponent was obtained. The relative deviations between formula results and experimental results are within 3%. Both expressions can be used for design and optimization to determine control valve parameters quantitatively. The results of 3D numerical simulation indicate that the topological structure of flow fields in all control valves is similar. The results of valve stability show that the airflow force acted on the valve disc depends on the vortex strength of flow around valve stem bush and valve disc, the asymmetric transonic impinging jet under the valve disc and the diffusing action. The valve operates steadily when the inlet and outlet Mach number are less than 0.15. As the unload degree is about 85%, stem vibrates at the operating conditions when pressure ratio is less than 0.8 and opening ratio is from 10% to 18%. A multihole annular orifice can make flow steady at all operating conditions.

An Experimental Investigation of Butterfly Valve Performance Downstream of an Elbow

1991 ◽  
Vol 113 (1) ◽  
pp. 81-85 ◽  
Author(s):  
M. J. Morris ◽  
J. C. Dutton
Keyword(s):  
Experimental Investigation ◽  
Pressure Drop ◽  
Mass Flow ◽  
Performance Characteristics ◽  
Flow Coefficient ◽  
Butterfly Valve ◽  
Operating Characteristics ◽  
Drop Mass ◽  
Torque Coefficient ◽  
Aerodynamic Torque

The results of an experimental investigation concerning the operating characteristics of a butterfly valve downstream of a mitered elbow are reported. Primary emphasis is given the influences of valve disk angle, valve/elbow spacing, and valve/elbow orientation on the dimensionless pressure drop, mass flow coefficient, and aerodynamic torque coefficient characteristics of the valve. The results show that when the valve is located two pipe diameters downstream of the elbow, the performance characteristics are substantially affected by the relative valve/elbow orientation. However, at a spacing of eight diameters the effect of the elbow on the valve operating characteristics is small.

scholarly journals A Study on Relationship of Flow coefficient and Valve Type for Design of Butterfly Valve

2007 ◽  
Vol 31 (1) ◽  
pp. 49-53
Author(s):  
Seung-Hwan Oh ◽  
Young-Hun Lee ◽  
Hyeung-Geol Kang ◽  
Hak-Guan Song ◽  
Jung-Ho Kang ◽  
...  
Keyword(s):  
Flow Coefficient ◽  
Butterfly Valve ◽  
Relationship Of

Effect of Tip Vortex Reduction on Air-Cooled Condenser Axial Flow Fan Performance: An Experimental Investigation

2021 ◽  
Author(s):  
J. P. Pretorius ◽  
J. A. Erasmus
Keyword(s):  
Performance Test ◽  
Performance Enhancement ◽  
Large Diameter ◽  
Pressure Coefficient ◽  
Axial Flow ◽  
Tip Clearance ◽  
Flow Coefficient ◽  
Tip Vortex ◽  
Experimental Investigations ◽  
Fan Performance

Abstract Large diameter axial flow fans are used in Air-cooled Condenser (ACC) systems of modern power stations. Efficiency improvements on these fans can significantly reduce the ACC power consumption and increase the net sent-out power to the grid. This study targets fan performance enhancement through blade tip vortex reduction. Experimental investigations are performed on a representative ACC scale fan, where tests consider the effects of tip clearance and two new tip endplate designs on fan performance. Test results confirm the findings of previous studies, showing the negative effect of increasing tip clearance on performance. Despite testing limitations, results from tests incorporating endplates show fan static pressure coefficient and efficiency increases over large ranges of flow coefficient compared to the datum fan. These outcomes agree with observations from literature and warrants further exploration. Future work is recommended to provide confirmation on the presented trends.

Assessments of Different Turbulence Models in Predicting the Performance of a Butterfly Valve

2018 ◽  
Author(s):  
Yu Duan ◽  
Matthew D. Eaton ◽  
Michael J. Bluck ◽  
Christopher Jackson
Keyword(s):  
Eddy Viscosity ◽  
Turbulence Models ◽  
Flow Coefficient ◽  
Butterfly Valve ◽  
Physical Measurements ◽  
Viscosity Models ◽  
Robust Model ◽  
Sst Model ◽  
Turbulence Effect ◽  
Torque Coefficient

This paper presents an assessment of the performance of four eddy viscosity models in STAR-CCM+ 12.04 in simulating water flow through an industrial size butterfly valve: the standard k-ε model, realizable model, lag EB k-ε model and k-ω-SST model. This is achieved by comparing RANS predictions with physical measurements already available in literature. Although the lag EB k-ε model and k-ω-SST model are supposed to have a better ability to capture the anisotropic turbulence effect and flow separations, it has been demonstrated that the standard k-ε model is still a robust model in terms of predicting the flow coefficient (Cv). The general error of Cv by the standard k-ε model is less than 10% for the considered openings with the exception of 80°. This work also demonstrates that the eddy viscosity models have more difficulty predicting the torque coefficient (Ct) than Cv.

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