Numerical Simulation and Experimental Study of a Two-Floor Structure Pumping System

2010 ◽  
Author(s):  
Chao Liu ◽  
Yan Jin ◽  
Jiren Zhou ◽  
Fangping Tang
Keyword(s):  
Numerical Simulation ◽  
Simple Structure ◽  
High Efficiency ◽  
Test Results ◽  
Pumping System ◽  
Performance Curves ◽  
The Standard Model ◽  
Floor Structure ◽  
Low Efficiency ◽  
Good Agreement

The two-floor flow passages pumping system with the simple structure is well practical in the Basin of Yangzi River downstream. However, this kind of pumping system has some disadvantages, such as low efficiency, easy to appear submerse vortex in discharge flow passages which causes the unit vibration and does harm to the operating of pump unit. In order to solve these problems, the design scheme with a new curve of diffusing outlet structure and inlet cone put forward, which are used in the renovation of the two-floor flow passages pumping station. With the numerical simulation of the two-floor flow passages pumping system, the flow fields are analyzed, and the external performance curves are obtained. To verify the calculation, a model tests were done using the standard model of pump. The test results are compared with the performance curves of numerical simulation. Good agreement of two results is found in the high efficiency area, which can show the calculation is believable. The new design improves the efficiency of pumping system significantly and eliminates the submerse vortex, also can guarantees the economy and security of operating.

Dynamic Test of Bird Strike on a Flat Plate Made from LY-12 Aluminium

2013 ◽  
Vol 765-767 ◽  
pp. 3158-3161
Author(s):  
Jun Liu ◽  
Zheng Li Zhang
Keyword(s):  
Numerical Simulation ◽  
Dynamic Response ◽  
Dynamic Test ◽  
Time History ◽  
Aircraft Design ◽  
Bird Strike ◽  
Test Results ◽  
Valuable Data ◽  
Good Agreement ◽  
Peak Value

Tests of bird strike have been carried out on plate made from LY-12 Aluminium. The test was down with the projectile impacting the target perpendicularly at velocity of 40m/s, 80m/s, 120m/s respectively. The displacement-time history curves and strain-time history curves of on LY-12 Aluminium plate were measured. The good agreement of the results between two specimens in one group indicated that the results tested in the presnet paper are reliable. The dynamic response of the plate and damage modes of the bird influenced by striking velocity were analyzed. The peak value of the displacement linear enlarged with the increasing of the striking velocity. The test results in the present paper provided valuable data for aircraft design impacted by bird, and also provided abundant test datas for the numerical simulation model applied in bird striking.

Numerical Simulation of the Unsteady Flow Patterns in a Small Squirrel-Cage Fan

2006 ◽  
Author(s):  
Sandra Velarde-Sua´rez ◽  
Rafael Ballesteros-Tajadura ◽  
Jose´ Gonza´lez-Pe´rez ◽  
Bruno Pereiras-Garci´a
Keyword(s):  
Numerical Simulation ◽  
Air Conditioning ◽  
Flow Distribution ◽  
Geometrical Model ◽  
Squirrel Cage ◽  
Automotive Air Conditioning ◽  
Commercial Code ◽  
Performance Curves ◽  
Flow Features ◽  
Good Agreement

In this work, a numerical simulation on the main flow features in a squirrel-cage fan, used in automotive air conditioning units, has been carried out. A 3D unsteady model has been developed for the entire machine. The flow in this geometrical model has been solved using the commercial code FLUENT®. Some of the analyzed features are the performance curves, the flow distribution over the different aspiration sections, the pressure and velocity distributions in selected surfaces, and the forces on the blades and on the whole impeller. The numerical results have been compared with the available experimental data, showing a reasonable good agreement.

scholarly journals Numerical and Experimental Investigation of External Characteristics and Pressure Fluctuation of a Submersible Tubular Pumping System

Processes ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 949 ◽  
Author(s):  
Yan Jin ◽  
Xiaoke He ◽  
Ye Zhang ◽  
Shanshan Zhou ◽  
Hongcheng Chen ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Pressure Fluctuation ◽  
High Efficiency ◽  
Pressure Pulsation ◽  
Guide Vane ◽  
Measurement Data ◽  
Flow Characteristics ◽  
Measuring Point ◽  
Pumping System ◽  
Impeller Outlet

This paper presents an investigation of external flow characteristics and pressure fluctuation of a submersible tubular pumping system by using a combination of numerical simulation and experimental methods. The steady numerical simulation is used to predicted the hydraulic performance of the pumping system, and the unsteady calculation is adopted to simulate the pressure fluctuation in different components of a submersible tubular pumping system. A test bench for a model test and pressure pulsation measurement is built to validate the numerical simulation. The results show that the performance curves of the calculation and experiment are in agreement with each other, especially in the high efficiency area, and the deviation is minor under small discharge and large discharge conditions. The pressure pulsation distributions of different flow components, such as the impeller outlet, middle of the guide vane, and guide vane outlet and bulb unit, are basically the same as the measurement data. For the monitoring points on the impeller and the wall of the guide vane especially, the main frequency and its amplitude matching degree are higher, while the pressure pulsation values on the wall of the bulb unit are quite different. The blade passing frequency and its multiples are important parameters for analysis of pressure pulsation; the strongest pressure fluctuation intensity appears in the impeller outlet, which is mainly caused by the rotor–stator interaction. The farther the measuring point from the impeller, the less the pressure pulsation is affected by the blade frequency. The frequency amplitudes decrease from the impeller exit to the bulb unit.

Design and Research on Electric Power Assistant Book Vehicle of Library

2012 ◽  
Vol 487 ◽  
pp. 130-133
Author(s):  
Tian Feng Zhao ◽  
Jian Bo Cao ◽  
Na Lu ◽  
Ze Bin Zhou ◽  
Cai Jun Ge
Keyword(s):  
Control System ◽  
Electric Power ◽  
Simple Structure ◽  
High Efficiency ◽  
Wheel Speed ◽  
The Body ◽  
Body System ◽  
Orientation Function ◽  
Library Book ◽  
Low Efficiency

To solve the problems of traditional library book vehicle: high labor intensity and low efficiency, a new book vehicle with electric power assistant was studied and designed. It included the body system and the control system. The body system could load books and achieve orientation function. The control system could achieve electric power assistant automatically according to wheel speed. The book vehicle was advantaged in simple structure, easy to use, saving manpower, high efficiency, so it was deserved to be used wildly.

Numerical Simulation on the Behaviors of Post-Embedded Bars in Reinforced Concrete

2012 ◽  
Vol 598 ◽  
pp. 454-458
Author(s):  
Jian Hua Yang
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Slip Model ◽  
Test Results ◽  
One Dimensional ◽  
Pull Out ◽  
Interface Slip ◽  
Experimental Values ◽  
Anchor Design ◽  
Good Agreement

Prism pull-out test results was used to build anchorage bonding interface slip model(ABISM), with this model, the behaviors of post-embedded bars in reinforced concrete with different anchorage depth were analyzed by one-dimensional numerical method, and the calculation values was compared with the experimental values. The results showed that: the calculated value is in good agreement with the experimental values. this model can provides an important reference for anchor design.

Experimental Research and Finite Element Analysis of BFRP Flexural Strengthening Efficiencies of Pre-Damaged Concrete Beams

2013 ◽  
Vol 834-836 ◽  
pp. 720-725 ◽  
Author(s):  
Hai Liang Wang ◽  
Wei Chang ◽  
Xin Lei Yang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Element Analysis ◽  
Flexural Strengthening ◽  
Flexural Resistance ◽  
Good Agreement

Six reinforced concrete beams, including 4 beams strengthened with BFRP sheets at different layer of BFRP sheets and 2 control beams, are tested to investigate the effect of layer of BFRP sheets on the ultimate flexural resistance and load-deflection response of the pre-damaged concrete beams strengthened with BFRP sheets. Results show that the flexural resistance of pre-damaged concrete beams increases along with the BFRP sheets layer increasing,but the flexural resistance enhances the degree not to assume the linear relations to the enforcement layer.Numerical simulation of the pre-damaged concrete beams strengthened with BFRP sheets is conducted by ANSYS, and the results of numerical simulation are compared with those of the test results. It turns out that the results of numerical simulation are in good agreement with the test results.

The Numerical Simulation of LNG Sloshing With an Improved Volume of Fluid Method

2004 ◽  
Author(s):  
Erwin Loots ◽  
Wouter Pastoor ◽  
Bas Buchner ◽  
Trym Tveitnes
Keyword(s):  
Numerical Simulation ◽  
Flow Problem ◽  
Volume Of Fluid ◽  
Navier Stokes ◽  
Test Results ◽  
Complex Flow ◽  
Offshore Industry ◽  
Lng Tank ◽  
Good Agreement ◽  
Made In

With the trend towards offshore LNG production and offloading, sloshing of LNG in partially filled tanks has become an important research subject for the offshore industry. LNG sloshing can induce impact pressures on the containment system and can affect the motions of the LNG carrier. So far, LNG sloshing was mainly studied using model tests with an oscillation tank. However, the development of Navier-Stokes solvers with a detailed handling of the free surface, nowadays allows the numerical simulation of sloshing. It should be investigated, however, how accurate the results of this type of simulations are for this complex flow problem. The present paper first presents the details of a numerical model, an improved Volume OF Fluid (iVOF) method. Comparisons are made with sloshing model test results. Based on the results, the following conclusions can be drawn: - The dynamics of sloshing in LNG tanks can be simulated numerically using an iVOF Navier-Stokes solver. - Several improvements have been made in the treatment of numerical spikes in the pressure signals, but still more improvements need to be made. - Qualitatively, the pressure pulses resulting from impacts against the LNG tank wall show a rather good agreement between experiment and numerical simulation. - Quantitatively, the differences with the experiment show that further detailed studies with respect to cell sizes and time steps are necessary.

Study on Vertical Earth Pressure of Slab Culvert under High Embankment

2012 ◽  
Vol 256-259 ◽  
pp. 1898-1902 ◽  
Author(s):  
Bao Kuan Ning ◽  
He Fan ◽  
Lei Gong ◽  
Guo Qing Liu
Keyword(s):  
Numerical Simulation ◽  
Boundary Conditions ◽  
Field Test ◽  
Structural Design ◽  
Earth Pressure ◽  
Test Results ◽  
Soil Pressure ◽  
Vertical Earth Pressure ◽  
The Impact ◽  
Good Agreement

With the increasing of embankment culvert engineering applications, there has been due in part to the structural design is too conservative and not economic or select unreasonable structural form, leading to the phenomenon of cracking or even collapse of the culvert structure, and the phenomenon has seriously affected the normal use of the highway. In this paper, the numerical simulation of vertical earth pressure distribution on different structural forms of embankment on culverts, to discuss the impact of boundary conditions, fill height, the thickness of the culvert culverts vertical earth pressure. Combined with Heda highway a culvert covert field test results and numerical simulation results were compared and analyzed. The results show that the numerical simulation and field test results in good agreement with the culvert structure in the form of vertical earth pressure of the embankment culverts have a greater impact; the structure of different forms of the culvert in the upper soil pressure is significantly different. In addition, analysis of the impact of boundary conditions, filling height of culvert vertical earth pressure values. The results can reference for the study of the structural design of the embankment culverts security.

Development of a High-Efficiency CVT

2010 ◽  
Vol 29-32 ◽  
pp. 2374-2379
Author(s):  
Jian Jun Hao ◽  
Jian Wei Wei ◽  
Wei Lv ◽  
Nai Shi Cheng
Keyword(s):  
Hydraulic System ◽  
High Efficiency ◽  
Test Results ◽  
Power Performance ◽  
Special Design ◽  
Axial Thrust ◽  
System A ◽  
Actuation System ◽  
Low Efficiency ◽  
Disc Spring

Aim to conquer the low efficiency of the current auto-CVT actuated by hydraulic system, a new design was proposed based on the analysis of the energy loss, which used compounded disc spring clamp set and motorized actuation system. Through the special design of the compounded disc spring and the balance spring, the axial thrust was well counterpoised, thus it achieved the result that the actuation system could be droved by low power motor. The test results show that the CVT developed according to the new design can reduce the power consumption obviously and improve the power performance.

Design of High-Speed Magnetic Pump Based on the Numerical Simulation

2009 ◽  
Author(s):  
Fanyu Kong ◽  
Zhiqiang Wang ◽  
Cuilan Gao ◽  
Hongli Zhang
Keyword(s):  
Numerical Simulation ◽  
High Speed ◽  
High Efficiency ◽  
Design Method ◽  
Internal Flow ◽  
Magnetic Coupling ◽  
Magnetic Vector Potential ◽  
Test Results ◽  
Working Situation ◽  
The Magnetic Field

The high-speed magnetic pump has the characteristic of zero leakage, small volume and high efficiency. In order to enhance the performance of high-speed magnetic pump and shorten the design period, the hydraulic components and magnetic coupling are designed on the basis of numerical simulation. The hydraulic components designed initially are applied by the design method of high-speed partial emission pump. The internal flow field of the pump is simulated with the FLUENT CFD software. The distributions of absolute velocity, relative velocity and total pressure of pump are gained. The inlet structure and geometry of the magnetic pump are modified based on the simulation results. The magnetic coupling is designed by using empirical factors. The magnetic field of the magnetic coupling is simulated with 2-D Magnetic Vector Potential (MVP) formula using the ANSYS software. The distributions of magnetic force line at origin, working situation and maximum magnetic rotating angle are obtained. The magnetic torque simulated value approaches the result calculated with the empirical formula. The test results of the improved magnetic pump show that the hydraulic performance and outline dimensions meet requirements. The method of design-simulation-improvement-test is successful.

Sign in / Sign up

Export Citation Format

Share Document