Study on the Relationship between Impeller Design Parameters and Performance of Partial Emission Pump Based on CFD Technology

2014 ◽  
Vol 532 ◽  
pp. 447-451
Author(s):  
Li Sheng Zhang ◽  
Jin Jiang ◽  
Zhi Huai Xiao ◽  
Yan Hui Li
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Inclination Angle ◽  
Static Pressure ◽  
Separation Bubble ◽  
Design Parameters ◽  
Turbulent Model ◽  
Blade Length ◽  
And Performance ◽  
The Relationship

In this paper, the relationship between impeller design parameters and performance of a partial emission pump is studied by numerical simulation. Nine straight radial impellers with different blade ratio γ (short blade length to long blade length ratio, γ=50%, 70% and 90%) and different front inclination angle β (β=8, 12 and 16 degree) were designed, while the rest geometric parameters of the pump were kept unchanged. All the numerical simulations were carried out by using the commercial software FLUENT V12.1 based on the Realizable k-ε turbulent model. The results showed that with increasing of front inclination angle, the capacity-head curve drops, the maximum head all appears at blade ratio γ=90%. The static pressure increases with increasing radius. A separation bubble can be observed at the outlet of diffuser tube.

Parameters deduced from the pressuremeter test

2002 ◽  
Vol 39 (6) ◽  
pp. 1333-1340 ◽  
Author(s):  
A Fawaz ◽  
M Boulon ◽  
E Flavigny
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Numerical Simulations ◽  
Fine Sand ◽  
Numerical Results ◽  
Pressuremeter Test ◽  
The Relationship ◽  
Pressuremeter Modulus

This paper presents a study of the pressuremeter test and the results that can be obtained from this test. Hostun's fine sand was chosen as the material upon which to perform the experimental study of the pressuremeter. Numerical simulations of the pressuremeter tests have been made with the commercially available PLAXIS software. The numerical results have been compared with the experimental ones. The variation of the parameters resulting from an applied surcharge was studied experimentally and numerically. Finally, the relationship between the magnitude of the deformation and the pressuremeter modulus was analyzed.Key words: sand, pressuremeter, triaxial, pressure, modulus, deformation, numerical simulation.

scholarly journals Implications of the Observed Relationship between Tropical Cyclone Size and Intensity over the Western North Pacific

2015 ◽  
Vol 28 (24) ◽  
pp. 9501-9506 ◽  
Author(s):  
Liguang Wu ◽  
Wei Tian ◽  
Qingyuan Liu ◽  
Jian Cao ◽  
John A. Knaff
Keyword(s):  
Numerical Simulation ◽  
Tropical Cyclone ◽  
Numerical Simulations ◽  
North Pacific ◽  
Western North Pacific ◽  
Horizontal Resolution ◽  
Wind Damage ◽  
Nonlinear Relationship ◽  
Rainfall Distribution ◽  
The Relationship

Abstract Tropical cyclone (TC) size, usually measured with the radius of gale force wind (34 kt or 17 m s−1), is an important parameter for estimating TC risks such as wind damage, rainfall distribution, and storm surge. Previous studies have reported that there is a very weak relationship between TC size and TC intensity. A close examination presented here using satellite-based wind analyses suggests that the relationship between TC size and intensity is nonlinear. TC size generally increases with increasing TC maximum sustained wind before a maximum of 2.50° latitude at an intensity of 103 kt or 53.0 m s−1 and then slowly decreases as the TC intensity further increases. The observed relationship between TC size and intensity is compared to the relationships produced by an 11-yr seasonal numerical simulation of TC activity. The numerical simulations were able to produce neither the observed maximum sustained winds nor the observed nonlinear relationship between TC size and intensity. This finding suggests that TC size cannot reasonably be simulated with 9-km horizontal resolution and increased resolution is needed to study TC size variations using numerical simulations.

Numerical Simulation and Performance Prediction for Hydraulic Performance of Mine Drainage Pump

2013 ◽  
Vol 281 ◽  
pp. 216-220
Author(s):  
Bao Liang Li ◽  
Zhi Shun Yan ◽  
Xiao Wei Hu
Keyword(s):  
Numerical Simulation ◽  
Static Pressure ◽  
Mine Drainage ◽  
Guide Vane ◽  
Three Dimension ◽  
Distribution Law ◽  
Operation Conditions ◽  
Multistage Pump ◽  
And Performance ◽  
Ansys Workbench

By using the CFX technology in ANSYS Workbench, based on the different operation conditions, the numerical simulation of three dimension steady turbulent flow is carried on the D type mine drainage pump. The pump includes first impeller and guide vane, secondary impeller and guide vane, inlet, outlet. The results will reveals the distribution law of flow field and static pressure, and it further forecasts the performance curve of the multistage pump by means of choosing standard model and setting frozen interface. This method can provide certain theory basis for the energy saving work of the multistage pump.

Numerical Simulation of Heat Transfer of Liquefied Natural Gas in Horizontal Circular Tubes under Supercritical Pressure

2014 ◽  
Vol 960-961 ◽  
pp. 438-441 ◽  
Author(s):  
Hai Yu Meng ◽  
Shu Zhong Wang ◽  
Lu Zhou ◽  
Zhi Qiang Wu ◽  
Jun Zhao ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Pressure Drop ◽  
Natural Gas ◽  
Numerical Simulations ◽  
Supercritical Pressure ◽  
Liquefied Natural Gas ◽  
Design Parameters ◽  
Circular Tubes ◽  
Submerged Combustion

The submerged combustion vaporizer (SCV) is a kind of equipment used for liquefied natural gas (LNG) vaporization. In order to get insights into the heat transfer of supercritical LNG, numerical simulations were carried out in this paper for investigating heat transfer of LNG in horizontal circular tubes under supercritical pressure. Numerical results showed that LNG temperature at the outlet under the design parameters was 276 K which met the demands of application. The velocity of LNG at the outlet was 12 m/s, and the pressure drop along the ducts was 120 kPa.

Numerical Simulation of IHF Fluorine Plastic Centrifugal Pump Inner Flow

2014 ◽  
Vol 945-949 ◽  
pp. 1011-1014
Author(s):  
Feng Lian Qi ◽  
Yong Xu Yan ◽  
Wei Zhao ◽  
Shi Qi Cao
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
Theoretical Basis ◽  
Power Efficiency ◽  
Field Calculation ◽  
Turbulent Model ◽  
Optimizing Design ◽  
Shaft Power ◽  
The Relationship ◽  
Calculation Software

The paper takes the twisted blades of fluorine plastic centrifugal pump as the research object. It used the flow field calculation software Fluent based on average N-S equations and standard k-ε turbulent model, and adopted the method of SIMPLEC algorithms, it conducted the numerical simulation on uncompressed flow of fluorine plastic centrifugal pump of twisted blades in different conditions. The results show that the relationship between the lift,shaft power,efficiency and flow, are compared with experimental ones, and it shows that the predicted performance coincides with the experimental one well, the simulation provides theoretical basis for the optimizing design.

Design and Performance of Vaneless Volutes for Radial Inflow Turbines: Part 2: Experimental Investigation of the Mean Line Performance—Assessment of Empirical Design Parameters

1994 ◽  
Vol 208 (3) ◽  
pp. 213-224 ◽  
Author(s):  
A Whitfield ◽  
S A MacGregor ◽  
A B Mohd Noor
Keyword(s):  
Experimental Investigation ◽  
Static Pressure ◽  
Swirling Flow ◽  
Design Procedure ◽  
Design Parameters ◽  
Flow Angle ◽  
One Dimensional ◽  
Specific Objective ◽  
The Mean ◽  
And Performance

The non-dimensional design procedure described in Part 1 assumed a one-dimensional compressible flow and as such relied on the empirical specification of the dissipation of angular momentum, the dissipation of energy and the deviation of the swirling flow from that of a free vortex. This was based largely on data available in the published literature. In order to develop and substantiate the empirical procedures further an experimental study was carried out in parallel with the development of the design procedure. The experimental investigation described here had the specific objective of assessing and developing appropriate empirical models and coefficients for application to the design procedure. The study concentrated on the application of a five-hole probe located in the centre of the volute passage and at a series of azimuth angles around the discharge. The probe provided stagnation and static pressure measurements, from which the gas velocity was derived, together with the flow angle. When taking measurements at the volute discharge a stationary dummy rotor was used to carry the five-hole probe.

Numerical Simulation of Agitated Flow Field of Submersible Mixer Based on Computational Fluid Dynamics

2010 ◽  
Vol 34-35 ◽  
pp. 1545-1548
Author(s):  
Wei Xing Xu ◽  
Shou Qi Yuan
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Flow Field ◽  
Constant Velocity ◽  
Simulation Software ◽  
Volume Flow ◽  
The Body ◽  
Design Parameters ◽  
Turbulent Model ◽  
Simulation Results

The flow formulation is founded as console formulation first, and with the body-fitted coordinate system and standard turbulent model, the numerical simulation of the internal 3-D incompressible turbulent flow agitated flow field of submersible mixer is carried out by numerical simulation software Fluent. The results showed that: the mixer impeller produced vortex jet flow, the constant velocity lines advanced as ellipse, the velocity along the centerline are larger than others, and utilized volume flow to transport the liquid. And, by changing some design parameters of mixer impeller, we can compare and analyze the numerical simulation results and present some optimal methods.

Aerodynamic Analysis of the Static Port’s Step Height

2014 ◽  
Vol 945-949 ◽  
pp. 992-997
Author(s):  
Hui Yang ◽  
Shi Pu Yang
Keyword(s):  
Numerical Simulation ◽  
Relative Error ◽  
Static Pressure ◽  
Step Height ◽  
Maximum Relative Error ◽  
Far Field ◽  
Aerodynamic Analysis ◽  
Accuracy Requirement ◽  
Static Source ◽  
The Relationship

To determine the static port’s installation accuracy requirement, the relationship between the step height and the static source error are studied by numerical simulation. It is found that the static pressure is higher than the pressure in far field when the step height is small, which is opposite when the step height is great. And the relative static source error is less than 0.18% when step height is within 0mm to 0.15mm. Besides, the maximum relative error caused by the uncertainty of the step height is found less than 0.06% if the installation accuracy of the static port is 0mm~0.1mm. By comparing the maximum static source error specified by airworthiness regulations, the static port’s installation accuracy requirement of 0.1mm is found to be appropriate.

Numerical Modeling of the Effects of Wears on Cutting Loads

2011 ◽  
Vol 308-310 ◽  
pp. 2340-2344 ◽  
Author(s):  
Xiao Yu Wang ◽  
Zong Xi Cai ◽  
Peng Cheng Su ◽  
Hai Feng Zhao ◽  
Yi Lan Kang
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Numerical Simulations ◽  
Penetration Depth ◽  
Normal Force ◽  
Disc Cutter ◽  
Fem Model ◽  
Simulation Results ◽  
Modified Formula ◽  
The Relationship

In order to determine the normal force acting on the TBM disc cutter, a 3-D FEM model is established to simulate the cutting process, with the failure effect of the rock. Afterwards, by using this model, a series of numerical simulations are performed. Based on the numerical simulation results, via modifying Evans formula, an improved formula is given. The modified formula indicates the relationship between the normal force acting on a single disc cutter and the penetration depth, and contains the influence of formation stress and wear.

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