scholarly journals Optimal Design of Diversion Piers of Lateral Intake Pumping Station Based on Orthogonal Test

2021 ◽  
Vol 2021 ◽  
pp. 1-9 ◽  
Author(s):  
Jiren Zhou ◽  
Miaomiao Zhao ◽  
Chuan Wang ◽  
Zhenjun Gao
Keyword(s):  
Orthogonal Experiment ◽  
Flow Characteristics ◽  
Orthogonal Test ◽  
Bend Angle ◽  
Relative Height ◽  
Rectification Effect ◽  
Pump Station ◽  
Reasonable Range ◽  
Length Width ◽  
Range Of Values

To explore the rectification parameters of the diversion piers optimized for the forebay of the pump station with a lateral angle of 45°, the orthogonal experiment and computational fluid dynamics methods are used to analyze the flow characteristics of the diversion piers under different parameter combinations. The flow pattern in the forebay of the side water inlet is improved. The rectification effect of the diversion piers under 16 schemes is analyzed, considering the length, width, radian, and relative height of the diversion piers. Combined with numerical simulation, a better rectification scheme is provided, and finally, a reasonable range of values for the rectification parameters of the forebay diversion pier of the side 45° bend angle pump station is obtained.

Application of Orthogonal Test in Numerical Simulation of Glass Lens Molding

2012 ◽  
Vol 497 ◽  
pp. 245-249
Author(s):  
Dao Cheng Zhang ◽  
Ke Jun Zhu ◽  
Yong Jian Zhu ◽  
Shao Hui Yin ◽  
Jian Wu Yu
Keyword(s):  
Process Parameters ◽  
Orthogonal Experiment ◽  
Fem Simulation ◽  
Orthogonal Test ◽  
Test Method ◽  
Testing Time ◽  
Molding Process ◽  
Glass Lens ◽  
Lens Molding ◽  
Process Factors

Glass lens molding is a high-volume fabrication method for producing optical components. In this paper, combined with the orthogonal test method and finite element method (FEM) simulation, the coupled thermo-mechanical analysis was carried out to analyze the key process factors. In order to reduce the testing time, an orthogonal test with three sets of level factors and three parameters is conducted to obtain the optimal molding process parameters. The result shows that the most significant parameter is molding velocity, the other effect parameters are molding temperature and friction coefficient. According to the previous analysis of orthogonal experiment, it is shown that the best optimal finishing process parameters were A2B1C1.

The Aluminum Brazing Pieces of Mechanical Performance Based on GRNN Neural Network

2013 ◽  
Vol 455 ◽  
pp. 154-158
Author(s):  
Xing Hua Liang ◽  
Lin Shi ◽  
Yu Si Liu ◽  
Xiao Ming Hua
Keyword(s):  
Neural Network ◽  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Mechanical Performance ◽  
Orthogonal Experiment ◽  
Approximation Error ◽  
Orthogonal Test ◽  
Generalized Regression Neural Network ◽  
Absolute Value ◽  
Material Preparation

Aluminum and aluminum alloy were widely used in various industrial fields,the key to application is the reliable welding. In this thesis,LF21 aluminum alloy brazing materials were designed and prepared by Orthogonal experiment,and mechanical properties of the brazing specimen was tested. Based on the GRNN(Generalized Regression Neural Network),Nonlinear relationship modle of brazing material preparation parameters and mechanical properties of the weldment was established.The results show that the model has better stability.When smooth factor value is 0.1,the network approximation error and prediction error absolute value is 0.01%.It can be realized that an nonliner mapping between the aluminum alloy brazing preparation parameters and solder joint tensil strenth based on the Orthogonal test and can do better prediction of the weld mechanical properties,according to brazing material preparation parameters.

An Optimization of Swirl Recovery Vane for Fokker 29 Propeller Using Design of Experiment Method

2016 ◽  
Author(s):  
Wang Yangang ◽  
Chen Nanshu ◽  
Li Qingxi ◽  
Georg Eitelberg
Keyword(s):  
Design Of Experiment ◽  
Orthogonal Experiment ◽  
Flow Characteristics ◽  
Optimal Solution ◽  
Tip Vortex ◽  
Total Efficiency ◽  
Thrust Coefficient ◽  
Steepest Ascent ◽  
Propeller Design ◽  
Coefficient Distribution

Compared with the single propeller, a propeller with Swirl Recovery Vanes (SRV) has great advantages in recovering the residual swirl, which leads to an improvement both in thrust and propulsion efficiency. Based on the preliminary design of the SRV for Fokker F29 propeller, Design of Experiment (DoE) method was employed to optimize and further improve the performance of SRV in the present study. Firstly, orthogonal experiment was adopted to identify the most significant factors for affecting thrust. Secondly, steepest ascent method was used to search for the optimum range of target factors by using climbing experiment and factorial experiment. Finally, center composite experiment was adopted to find the optimal solution. As a result, the thrust of the optimized SRV has increased significantly by 11.78% at the design point, which leads to a 0.66% increment of total efficiency of propeller and SRV propulsion system, and even more increment at low rotation speed (2.10%). Besides, compared with the original SRV, the optimized SRV geometry improves the flow characteristics at the tip region of the vane. The tip vortex and swirl kinetic energy have been weakened distinctly, and the thrust coefficient distribution along the spanwise tends to be more uniform.

Optimum Grinding Parameters for CRYSTOE and NEOPARIES Based on Orthogonal Experiment

2013 ◽  
Vol 274 ◽  
pp. 61-64
Author(s):  
Li Xu ◽  
Hong Dong Li ◽  
Li Li Zhou
Keyword(s):  
Orthogonal Experiment ◽  
Processing Parameters ◽  
Orthogonal Test ◽  
Test Method ◽  
Quality Requirements ◽  
Military Equipment ◽  
Optimal Processing ◽  
Orthogonal Test Method ◽  
New Material ◽  
Very High

Abstract. As a new material ,CRYSTOE and NEOPARIES are widely used in aerospace and military equipment, its surface quality requirements is very high. CRYSTOE and NEOPARIES disc convex machining has done a lot of trials. And analyzed the experimental data by using Orthogonal test method get the optimal processing parameters. It also provide a reference for future processing tests.

Experimental Study on Sugarcane Top Chopper

2021 ◽  
Vol 37 (2) ◽  
pp. 243-250
Author(s):  
Jiwei Hu ◽  
Shaochun Ma ◽  
Shili Gao ◽  
Jing Bai ◽  
Fenglei Wang ◽  
...  
Keyword(s):  
Orthogonal Experiment ◽  
Orthogonal Test ◽  
Critical Parameters ◽  
List Type ◽  
Optimal Parameters ◽  
Single Factor ◽  
Machine Performance ◽  
Feeding Speed ◽  
Working Performance ◽  
Single Factor Experiment

HighlightsThis article focuses on the sugarcane top chopper.The influence of three factors on the experimental indexes was studied.The optimal parameters combination of working performance was obtained.Abstract. In the process of sugarcane harvesting, sugarcane tops are cut off by the chopper and directly thrown into the field. A small percentage of sugarcane tops are picked and collected to feed livestock. Therefore, it is meaningful to develop an effective sugarcane top chopper which is used to harvest sugarcane tops before harvesting sugarcane stalk harvesting. In this study, a sugarcane top chopping platform was fabricated to investigate critical parameters such as chopping speed (CS), top feeding speed (FS), and cutting drum gap (DG) on the machine performance. In evaluating the sugarcane top chopper, three single factor experiment and one orthogonal experiment were carried out. The single factor test was used to examine the effect of CS, FS and DG on the chopping performance of the machine. According to orthogonal test, the comprehensive influence order was determined: cutting drum gap > chopping speed > top feeding speed. The optimal parameters combination for good working performance of the machine was obtained: chopping speed was 750 rpm, top feeding speed was 1.2 m·s-1, and cutting drum gap was 20 mm. The relationships between the chopping performance and the three critical factors were examined and analyzed to provide theoretical basis for the development of a sugarcane top chopper. Keywords: Chopping performance, Orthogonal test, Single factor test, Sugarcane top chopper, Variance analysis.

FSI-Based Assessment of FAC-Caused Wall Thinned Piping

2009 ◽  
Author(s):  
Sun-Hye Kim ◽  
Yoon-Suk Chang ◽  
Young-Jin Kim
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Structural Integrity ◽  
Flow Characteristics ◽  
Limit Load ◽  
Bend Angle ◽  
Piping System ◽  
Integrity Assessment ◽  
Wall Thinning ◽  
Analysis Scheme

Lots of investigations on failures of wall thinned piping have been carried out since the accident of Surry unit 2 in USA. From these preceding efforts, flow accelerated corrosion (FAC) which is a kind of wall thinning phenomenon is revealed main factor of failure of pipes in nuclear power plants. However, there are a few researches which directly take into account of flow characteristics and geometric changes for stress assessment of FAC-caused wall thinned piping. In this paper, structural integrity assessment employing a fluid-structure interaction (FSI) analysis scheme is performed on pipes representing secondary piping system of PWR which consists of straight pipes and elbows of various bend angles. Prior to the assessment, CFD analyses are conducted to predict plausible wall thinning location by considering flow and geometric parameters such as bend angle and radius of elbow. Then, for typical pipe geometry, detailed limit load analyses are performed to calculate maximum stress caused by turbulence and velocity of flow near the wall thinned part. Through these kinds of detailed parametric analyses, effects of FSI were observed, which should be considered for assessment of FAC-caused wall thinned piping.

scholarly journals Effective Height of a Floor Splitter Anti-Vortex Device under Varying Flow Conditions

2016 ◽  
Author(s):  
Hyung-Jun Kim ◽  
Sung Won Park ◽  
Dong Sop Rhee
Keyword(s):  
Flood Control ◽  
Flow Characteristics ◽  
Design Standards ◽  
Effective Height ◽  
Pump Station ◽  
Vertical Location ◽  
Pump Sump ◽  
A Site ◽  
Inflow Conditions ◽  
Control Facility

A pump station is a very important flood control facility for mitigating inundation of urban lowland areas. It is not easy to secure a site to increase the capacity of a pump station in an urban area because of various limitations or to maximize the discharge capacity of the pump sump. Adding a facility to improve the pump capacity of a pump station may affect the flow characteristics, such as unexpected increases in the flow velocity and vorticity, and cause severe problems with operating the pump station. To solve those problems, anti-vortex devices (AVDs) have been developed and adopted for appropriate design standards. The Korean design criteria for AVDs are based on experience and foreign standards because not enough data on the AVD are available. In this study, the flow in the sump was numerically simulated at various AVD heights to collect information on improving the design and efficiency of a pump station. Consequently, an appropriate height for the AVD and changes in the flow pattern and vortex in the pump sump were determined and compared with 12 cases of inflow conditions with respect to the vertical location.

scholarly journals Experimental Study on Downhole Oil-water Separation Hydrocyclone

2015 ◽  
Vol 8 (1) ◽  
pp. 257-261 ◽  
Author(s):  
Xu Yan ◽  
Yuan Lin ◽  
Wang Zunce ◽  
Li Sen ◽  
Zhang Jinglong ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Orthogonal Experiment ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Practical Application ◽  
Water Separation ◽  
Rotating Speed ◽  
Split Ratio ◽  
Oil Water Separation ◽  
Oil Water

In the process of downhole oil-water separation, the traditional liquid-liquid separation hydrocyclone (LLSH) is used in conjunction with screw pumps, which makes the hydrocyclone rotating around its own axis. The rotation of wall of hydrocyclone affects its internal flow characteristics and separation properties directly. The orthogonal experiment of the downhole oil-water separation hydrocyclone (DOWSH) is designed to analyze the effect of flowrate, rotating speed and split ratio on separation efficiency and pressure drop, The primary and secondary factors of operation parameters have been studied, and the optimum condition and reasonable working range of DOWSH have been obtained. It provides reliable basis for process of practical application of DOWSH􀀁so as to guide the production.

PIV Experimental Analysis for the Inter Flow Characteristics in the Pump Suction Sump

2002 ◽  
Author(s):  
Yong Li ◽  
Xiaoming Li ◽  
Botao Zhang ◽  
Yulin Wu ◽  
Tomoyoshi Okamura
Keyword(s):  
Full Range ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Flow Conditions ◽  
Pump System ◽  
Pump Station ◽  
Base Experiment ◽  
Image Velocimetry ◽  
Flow Situation ◽  
A New Technique

PIV (Particle Image Velocimetry) is a new technique of flow measurement. In this experiment PIV technique is used to measure the flow conditions in the pump sump model, which are very complicated, especially in the surrounding of the pump bell where there are very complex vortexes. These will affect the flow characteristics in the pump system broadly and result in vibration and cavitation, and decrease the efficiency of the system. And these will harm the performance of pump station, and even lead it out of order. The vortex surrounding the pump bell has the direct relationships with the structure of the pump suction sump and the pump bell. In this experiment the pump suction sump and the pump bell with particularly structure are used to research the flow situation in the surrounding of the bell. The PIV method is used in the experimental to study the flow conditions surrounding the pump bell. Using this technique the flow velocities, the streamlines and the turbulent kinetic energies in the full range can be obtained. Moreover, other important parameters can be gotten after being analyzed the base experiment data further. Here, the results of the PIV experiment on flow in pump suction sump are analyzed further, and the following parameters are obtained: circulation vector of the inlet flow of bell, three-dimensional velocity and turbulent kinetic energies. And through analyzing the experiment’s photos, the air core’s conditions in the bell also can be gotten.

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