A Study on the Inner Surface Pressure Distribution of Fluid in Ninety Degree Elbow Pipe

2015 ◽  
Vol 713-715 ◽  
pp. 34-38 ◽  
Author(s):  
Xiao Yang Lu ◽  
Hong Liang Zhu ◽  
Xiao Li Lu ◽  
Jin Ming Liu ◽  
Yong Zhou ◽  
...  
Keyword(s):  
High Pressure ◽  
Surface Pressure ◽  
Maximum Relative Error ◽  
Pressure Data ◽  
Simulation Data ◽  
Outlet Pressure ◽  
Axial Angle ◽  
Surface Pressure Distribution ◽  
Inner Surface ◽  
Fluent Software

On the premise of the simulation data for the inner fuild passing the elbow pipe by means of software named FLUENT and dimensional analysis, the formula modle of inner surface pressure for elbow pipes came up by analyzing the relationships among the inner surface pressure P ,the fluid outlet pressure P0 ,axial angle α, circular angle β and the degree of curvature k; Depending on the inner surface pressure data simulated under 150 kinds of conditions, the pressure formula was fitted by means of 1stOpt software; The verification results show that the calculated value by the formula matched with the value of simulation by FLUENT software very well, the maximum relative error was 0.004%, and the research conclusion layed the theoretical groundwork for the design of the high pressure and high velocity elbow.

Simulation of Influencing Parameters of the Inner Surface Pressure of Elbow Pipe and the Establishment of Pressure Formula

2012 ◽  
Vol 252 ◽  
pp. 64-68
Author(s):  
Xiao Yang Lu ◽  
Xiao Li Lu ◽  
Li Li Huang ◽  
Jin Ming Liu ◽  
Ying Yue Liu ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Surface Pressure ◽  
Structural Design ◽  
Computational Formula ◽  
Fluid Density ◽  
Outlet Pressure ◽  
Flow Parameters ◽  
Inner Surface ◽  
Fluent Software ◽  
Influencing Parameters

According to the variation of the flow parameters of the flow velocity v, outlet pressure P0 and fluid density ρ by using the FLUENT software, the influencing regularity of the distribution of the inner surface pressure in elbow pipe was analyzed. Based on the study, the pressure computational formula for 90 degree elbow pipe on the characteristic section α=45° was built. The research conclusion lays the groundwork for strength check and structural design of the elbow pipe.

The Establishment of Distribution Model of Inner Surface Pressure of Elbow Pipe Based on FLUENT

2013 ◽  
Vol 470 ◽  
pp. 236-239 ◽  
Author(s):  
Xiao Yang Lu ◽  
Wei Zheng ◽  
Li Li Huang ◽  
Yong Zhou ◽  
Hong Liang Zhu
Keyword(s):  
Structural Design ◽  
Fluid Velocity ◽  
Distribution Model ◽  
Fluid Density ◽  
Analysis Method ◽  
Simulation Data ◽  
Outlet Pressure ◽  
Axial Angle ◽  
Dimensionless Analysis ◽  
Inner Surface

The processes of the fuild through the elbow pipe under different conditions are simulated by the FEM software named FLUENT. Then, the effects of varied parameters on the distribution of pressure on inner suface of elbow pipe are studied with dimensionless analysis method. Finally, a distribution model of pressure at the the minimum life section where the axial angle α is 45°, degree of curvature k=R/d, circle angle β, fluid density ρ, fluid outlet pressure P0 and fluid velocity v is built and verified by fitting the simulation data. The research conclusion lays the groundwork for strength check and structural design of the elbow pipe

A Three-Dimensional Distribution Model of Pressure on Inner Surface of Elbow Pipe Based on FLUENT

2014 ◽  
Vol 1006-1007 ◽  
pp. 42-46
Author(s):  
Xiao Yang Lu ◽  
Wei Zheng ◽  
Li Li Huang ◽  
Yong Zhou ◽  
Xin Guang Li ◽  
...  
Keyword(s):  
Structural Design ◽  
Fluid Velocity ◽  
Quantitative Description ◽  
Three Dimensional ◽  
Distribution Model ◽  
Simulation Data ◽  
Outlet Pressure ◽  
Axial Angle ◽  
Inner Surface ◽  
Dimensional Distribution

Using the methods of dimensional analysis and the FLUENT analytic software, a quantitative description method is built; the influents of parameters, including the degree of curvature k=R/d, fluid density ρ, axial angle α, circle angle β, fluid outlet pressure P0 and fluid velocity v on the distribution of pressure on inner surface of elbow pipe are studied from the simulation results; Finally, a three-dimensional distribution model of pressure which is considering the fluid characteristic and the elbow pipe geometric parameters is built by fitting the simulation data. The research conclusion lays the groundwork for strength check and structural design of the elbow pipe.

Surface Pressure Distribution on a Blade of a 10 m Diameter HAWT (Field Measurements versus Wind Tunnel Measurements)

2005 ◽  
Vol 127 (2) ◽  
pp. 185-191 ◽  
Author(s):  
T. Maeda ◽  
E. Ismaili ◽  
H. Kawabuchi ◽  
Y. Kamada
Keyword(s):  
Wind Tunnel ◽  
Surface Pressure ◽  
Field Measurements ◽  
Reynolds Numbers ◽  
Blade Surface ◽  
Pressure Data ◽  
Surface Pressure Distribution ◽  
Pressure Distributions ◽  
Wind Tunnel Data ◽  
Local Angle

This paper exploits blade surface pressure data acquired by testing a three-bladed upwind turbine operating in the field. Data were collected for a rotor blade at spanwise 0.7R with the rotor disc at zero yaw. Then, for the same blade, surface pressure data were acquired by testing in a wind tunnel. Analyses compared aerodynamic forces and surface pressure distributions under field conditions against analogous baseline data acquired from the wind tunnel data. The results show that aerodynamic performance of the section 70%, for local angle of attack below static stall, is similar for free stream and wind tunnel conditions and resemblances those commonly observed on two-dimensional aerofoils near stall. For post-stall flow, it is presumed that the exhibited differences are attributes of the differences on the Reynolds numbers at which the experiments were conducted.

Effects of Geometric Parameters on the Inner Surface Pressure of Elbow Pipe and the Establishment of Pressure Model

2012 ◽  
Vol 252 ◽  
pp. 111-115
Author(s):  
Xiao Yang Lu ◽  
Xiao Li Lu ◽  
Li Li Huang ◽  
Jin Ming Liu ◽  
Ying Yue Liu ◽  
...  
Keyword(s):  
Cross Section ◽  
Surface Pressure ◽  
Structural Design ◽  
Geometric Parameters ◽  
Computational Formula ◽  
Bending Angle ◽  
Oil Pipeline ◽  
Inner Surface ◽  
Fluent Software ◽  
Inner Diameter

Elbows of oil pipeline were adopted to study the effect of the variation of the geometric parameters of the inner diameter d, bending degree k =R/d and bending angle A on the distribution regularity of the inner surface pressure, with the simulation by the FLUENT software. Based on the analysis, the pressure computational formula on the dangerous cross section α=45° was built by using 1stOpt software. The values computed by the formula agree well with the ones simulated by FLUENT, which lays the groundwork for strength check and structural design of the elbow pipe.

Streamwise Fluidelastic Instability in a Deformed Rotated Triangular Tube Array With Pitch-to-Diameter Ratio of 1.375

2015 ◽  
Author(s):  
Daniel B. Keogh ◽  
Craig Meskell
Keyword(s):  
Surface Pressure ◽  
Diameter Ratio ◽  
Streamwise Direction ◽  
Pressure Data ◽  
Steam Generators ◽  
Drag Forces ◽  
Surface Pressure Distribution ◽  
Pressure Distributions ◽  
Fluidelastic Instability ◽  
Stable Flow

A study of the surface pressure distribution of a cylinder in a deformed rotated triangular tube array with pitch-to-diameter ratio of 1.375 has been performed. This work was motivated by the failure of steam generators in San Onofre Nuclear Generating Station (SONGS) in Southern California, which occurred as a result of fluidelastic instability in the streamwise direction. This particular failure occurred in the U-bend region of the steam generators. The presence of anti-vibration bars (AVB) in this region prevent the tubes from experiencing fluidelastic insatiably (FEI) in the transverse direction but offer little support in the streamwise direction. This study analyses the streamwise direction vibration of the tubes in the U-bend region using experimental data and a simplified quasi-steady model. Surface pressure data was gathered in a draw down wind tunnel for a range of flow velocities using an instrumented cylinder with 36 pressure taps around the circumference of the cylinder at midplane. The instrumented cylinder was mounted in the 4th and 6th rows of the tube array. The effect of streamwise displacement of up to ±10% of the instrumented tube and its neighbours was investigated. Although bi-stable flow was detected, only the forces in the lift direction were substantially affected. The displacement dependent drag forces acting on the instrumented cylinder were determined by integrating the pressure distributions with respect to angle. Hence the coupled fluid stiffness matrix could be assembled for each flow velocity studied. The effect of Reynolds number was also investigated for a number of scenarios.

Failure Analysis of Hydrogen Corrosion of the Lens Gasket

2010 ◽  
Vol 37-38 ◽  
pp. 462-465
Author(s):  
Xiao Chun Ma ◽  
Guang Fei Xu
Keyword(s):  
High Pressure ◽  
Failure Analysis ◽  
Intergranular Crack ◽  
Optical Microscope ◽  
Corrosion Characteristic ◽  
Hydrogen Corrosion ◽  
Corrosion Depth ◽  
Fertilizer Plant ◽  
Inner Surface ◽  
Hydrogen Blister

The 10MoWVNb steel lens gaskets are widely used for the flange linking of high pressure tube in the synthetic ammonia system in chemical fertilizer plant. The gasket worked in H2-N2-NH3 environment at the temperature of 300°C. It often fails because of hydrogen corrosion. The microstructure and corrosion characteristic of the lens gasket were studied by optical microscope. The results showed that the hydrogen blister appeared preferentially at the interface of inclusions. The corrosion depth was 0.65 millimeter. There were little intergranular crack on inner surface.

The Inductive Coil Technique for High-Pressure Measurements: An Analysis of Nonhomogeneous Material Environment as a Source of Irreproducibility and Error

1967 ◽  
Vol 89 (3) ◽  
pp. 554-560 ◽  
Author(s):  
A. A. Giardini
Keyword(s):  
High Pressure ◽  
Internal Pressure ◽  
Elastic Constants ◽  
Graphical Form ◽  
Pressure Measurements ◽  
Pressure Data ◽  
Nonhomogeneous Material ◽  
Resistivity Measurements ◽  
Material Environment ◽  
Critical Yield

Significant sources of error independent of the apparatus are analyzed on the basis of experimental experience and elastic theory. All are mechanical in nature and subject to corrective action. The most serious is found to be self-generating internal pressure differences which result from differential elastic and dimensional values in multicomponent assemblies. High-pressure data on elastic constants, relative critical yield stresses, radial displacements, and ratios of external to internal pressure for various compositional arrangements of pyrophyllite, MgO, NaCl, and AgCl are given in graphical form. Observance of suggested corrective measures can render the inductive coil technique capable of operational accuracies of 2 percent or better in compressibility and resistivity measurements.

Design Optimization of Cryogenic Pump Inducer Considering Suction Performance and Cavitation Instability

2011 ◽  
Author(s):  
Hiroyoshi Watanabe ◽  
Hiroshi Tsukamoto
Keyword(s):  
Pressure Distribution ◽  
Design Optimization ◽  
Surface Pressure ◽  
Design Approach ◽  
Inverse Design ◽  
Blade Surface ◽  
Free Vortex ◽  
Surface Pressure Distribution ◽  
Cavitation Instability ◽  
Suction Performance

This paper presents the result of design optimization for three-bladed pump inducer using a three-dimensional (3-D) inverse design approach, Computational Fluid Dynamics (CFD) and DoE (Design of Experiments) taking suction performance and cavitation instability into consideration. The parameters to control streamwise blade loading distribution and spanwise work (free vortex or non-free vortex) for inducer were chosen as design optimization variables for the inverse design approach. Cavitating and non-cavitating performances for inducers designed using the design variables arranged in the DoE table were analyzed by steady CFD. Objective functions for non-cavitating operating conditions were the head and efficiency of inducers at a design flow (Qd), 80% Qd and 120% Qd. The volume of the inducer cavity region with a void ratio above 50% was selected as the objective function for inducer suction performance. In order to evaluate cavitation instability by steady CFD, the dispersion of the blade surface pressure distribution on each blade was selected as the evaluation parameter. This dispersion of the blade surface pressure distribution was caused by non-uniformity in the cavitation length that was developed on each inducer blade and increased when the cavitation number was reduced. The effective design parameters on suction performance and cavitation instability were confirmed by sensitivity analysis during the design optimization process. Inducers with specific characteristics (stable, unstable) designed using the effective parameters were evaluated through experiments.

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