An Evaluation of Simulated Flow and Experimental Study Through an Axial Fan

2003 ◽  
Author(s):  
J. Xie ◽  
R. S. Amano ◽  
E. K. Lee
Keyword(s):  
Experimental Study ◽  
Cfd Simulation ◽  
Dynamic Pressure ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Axial Fan ◽  
Rotating Reference Frame ◽  
Speed Up ◽  
Fan Blade ◽  
Simulated Flow

A comprehensive three-dimensional CFD approach and experimental study is developed for a 6-ft diameter commercial axial fan with rotational speed up to 1014 rpm. The use of sophisticated CFD software has made it possible to simulate fluid flow in complex moving geometries found in rotating machinery such as fans, pumps compressors, etc. In this paper, FLUENT is used to study an axial fan performance. Simulations are performed for steady state conditions using an implicitly rotating reference frame for the blades. Experimental studies are also conducted to visualize the flow on fan blade surface by using tuft method. The pressure and velocity distribution in front of the fan and the uncertainty dynamic pressure field measurement are also carried out. Comparisons between CFD simulation results and experimental measurement are found to be reasonable.

Three-Dimensional CFD Simulation for Water-Lubricated Guide Bearing of Large Tubular Pump

2014 ◽  
Vol 574 ◽  
pp. 160-166
Author(s):  
Hua Rong Xin ◽  
Ming Yue Zhang
Keyword(s):  
Cfd Simulation ◽  
Pressure Effect ◽  
Load Capacity ◽  
Dynamic Pressure ◽  
Water Pressure ◽  
Three Dimensional ◽  
Water Film ◽  
Static Characteristics ◽  
Pressure Distributions ◽  
High Speeds

A numerical simulation for flow field in water-lubricated guide bearing of large tubular pump is conducted by software Fluent, which shows the pressure distribution of water film with different rotating speeds and the rule of the influence of relevant parameters on the amount of lubricating water, dynamic and static characteristics of guide bearing.The result shows that the pressure distributions of water film at low and high speeds are very different, and with the obvious dynamic pressure effect, the bearing inner can be in a state of reflux and the water-lubricated amount and clearance are reduced. The load capacity and stiffness of guide bearing are increased along with the speed and water pressure increase meanwhile the amount of water is increased along with the speed lowering and the water pressure and clearance increase.

Numerical Testing of a Trailing Edge Passive Morphing Control for Large Axial Fan Blades

2017 ◽  
Author(s):  
A. Castorrini ◽  
A. Corsini ◽  
A. G. Sheard ◽  
F. Rispoli
Keyword(s):  
Three Dimensional ◽  
Passive System ◽  
Axial Fan ◽  
Structure Interaction ◽  
Numerical Testing ◽  
Potential Benefits ◽  
Complex Fluid ◽  
Fan Blade ◽  
Interaction Problem ◽  
Section Level

The concept of morphing geometry to control and stabilize the flow has been proposed and applied in several aeronautic and wind turbine applications. We studied the effect of a similar passive system applied on an axial fan blade, analysing potential benefits and disadvantages associated to the passive coupling between fluid and structure dynamics. The present work completes a previous study made at the section level, giving a view also on the three-dimensional effects. We use the numerical computation to simulate the system which defines a complex fluid-structure interaction problem. In order to do that, an in-house finite element solver, already used in the previous study, is applied to solve the coupled dynamics.

Numerical Testing of a Trailing Edge Passive Morphing Control for Large Axial Fan Blades

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Alessio Castorrini ◽  
Alessandro Corsini ◽  
Anthony G. Sheard ◽  
Franco Rispoli
Keyword(s):  
Three Dimensional ◽  
Passive System ◽  
Axial Fan ◽  
Structure Interaction ◽  
Numerical Testing ◽  
Potential Benefits ◽  
3D Effects ◽  
Complex Fluid ◽  
Fan Blade ◽  
Section Level

The concept of morphing geometry to control and stabilize the flow has been proposed and applied in several aeronautic and wind turbine applications. We studied the effect of a similar passive system applied on an axial fan blade, analyzing potential benefits and disadvantages associated to the passive coupling between fluid and structure dynamics. The present work completes a previous study made at the section level, giving a view also on the three-dimensional (3D) effects. We use the numerical computation to simulate the system, which defines a complex fluid–structure interaction (FSI) problem. In order to do that, an in-house finite element (FE) solver, already used in the previous study, is applied to solve the coupled dynamics.

Shape Optimisation of Axial Fan Blades Using Genetic Algorithms and a 3D Navier-Stokes Solver

2006 ◽  
Author(s):  
O. Lotfi ◽  
J. A. Teixeira ◽  
P. C. Ivey ◽  
I. R. Kinghorn ◽  
A. G. Sheard
Keyword(s):  
Genetic Algorithm ◽  
Thickness Distribution ◽  
Three Dimensional ◽  
Automated Design ◽  
Navier Stokes ◽  
Shape Optimisation ◽  
Axial Fan ◽  
Optimization Task ◽  
Blade Thickness ◽  
Fan Blade

The paper describes the development of an automated design process which was developed to aerodynamically optimise an industrial fan blade geometry taking account of the predicted three dimensional flow. The optimiser employs a genetic algorithm for global optimisation purposes and is coupled to the academic Navier-Stokes solver MULTIP. The optimization task is accomplished by modifying the blade camber line, lean and sweep while keeping the blade thickness distribution and mass flow rate, constant. A number of different configurations have been studied and the behaviour of genetic algorithm tested. Specific interfaces were developed in order to link the optimization code, the automatic grid generator STAGEN, utilised to define the computational meshes, and the three-dimensional Navier-Stokes solver within an automated design loop. The results obtained show that the genetic algorithm when coupled to a CFD tool is not only capable of achieving an improvement in the designs of existing axial fan blades effectively but also that they achieve these results with a minimum amount of user expertise.

Acoustic Analysis of Condenser Fan of Split Air Conditioner Using Numerical and Experimental Method

2015 ◽  
Vol 23 (02) ◽  
pp. 1550012 ◽  
Author(s):  
Nitin Gulhane ◽  
Sandip Patil ◽  
Kanwaljeet Singh
Keyword(s):  
Cfd Simulation ◽  
Acoustic Analysis ◽  
Three Dimensional ◽  
Axial Flow ◽  
Accurate Method ◽  
Experimental Result ◽  
Optimized Design ◽  
Air Conditioner ◽  
Ansys Fluent ◽  
Fan Blade

The present work aims to investigate the accurate method of performing computational fluid dynamics (CFD) — Acoustic analysis for axial flow fans in split air conditioner system. A comprehensive simulation procedure is developed to predict flow-induced noise in a system. The three-dimensional domain using k–ε turbulence model and Ffowcs Williams and Hawkings (FW-H) acoustic model is considered to predict noise generated by the fan blade surface. The acoustic and flow performances of the fan are predicted simultaneously using a computational aero-acoustic technique (combining steady flow and noise propagation analysis). The different cases are simulated by varying the blade angle, blade depth, blade width and serrations at trailing edge of fan blade. An impact of each of these parameter on A-weighted sound pressure level (SPL) and mass flow rate at outlet is determined. The numeric value of obtained A-weighted SPL by CFD simulation is found to be in close agreement with the experimental result within 5.4%. Finally, above mentioned parameters are varied in simulation and optimized design is proposed based on A-weighted SPL and cubic feet per minute (CFM). All simulations are carried out in commercially available CFD solver; ANSYS FLUENT 13.

scholarly journals CFD Simulation of Local Scouring Around Bridge Pier

2019 ◽  
Vol 9 (1) ◽  
pp. 1870-1880
Keyword(s):  
Cfd Simulation ◽  
Flow Behavior ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Local Scour ◽  
Bridge Pier ◽  
Bridge Piers ◽  
Multiphase Model ◽  
Model Studies ◽  
Dimensional Simulation

The threat of local scour around bridge piers has been in research for many years. According to the various studies, local scour around the bridge pier is the prime cause for most of the bridge failures. The main objective of the present study was to investigate the flow behavior and the scour phenomenon around the bridge piers of various shapes namely Circular, Elliptical, Square and Streamlined. Local scouring depends on various factors like depth of flow, upstream flow conditions, pier shape and dimensions. Here, we have taken only pier shape as the primary factor and kept other factors constant. The numerical simulations were even carried out using CFDFluent, Eulerian multiphase model, k–epsilon turbulence model, to elaborate the physics behind the scour formation. CFD simulation tool can be used for wide understanding of the flow behavior around the bridge piers even without physical model studies because it saves time and money as compared to experimental studies. Three dimensional simulation of flow behavior around four pier shapes indicates that the streamlined pier is the most efficient pier to use as it allows the flow to pass smoothly around it creating less obstruction to the flow and hence creating less chances of local scouring near the pier toe.

scholarly journals Experimental Study of a natural ventilation strategy in a Full-Scale Enclosure Under Meteorological Conditions: A Buoyancy-Driven Approach

2018 ◽  
Vol 3 (1) ◽  
pp. 657
Author(s):  
Miguel Chen Austin ◽  
Denis Bruneau ◽  
Alain Sempey ◽  
Laurent Mora ◽  
Alain Sommier
Keyword(s):  
Experimental Study ◽  
Exchange Rate ◽  
Natural Ventilation ◽  
Cfd Simulation ◽  
Experimental Studies ◽  
Meteorological Conditions ◽  
Full Scale ◽  
Ventilation Strategy ◽  
Air Exchange Rate ◽  
Air Exchange

The performance of a natural ventilation strategy, in a full-scale enclosure under meteorological conditions is studied through an experimental study, a buoyancy-driven approach, by means of the estimation of the air exchange rate per hour and ventilation power. A theoretical and an empirical model are proposed based on the airflow theory in buildings and blower-door tests. A preliminary validation, by comparing our results with standards in air leakage rate determination, is made. The experimental study conducted here has shown that the natural ventilation strategy implemented reach promising air exchange rate levels, as they are rather high compared to other experimental studies found in the literature.  The proposed models have shown good potential and further analysis should take place. Also, other methods for validating these models should be implemented (for instants: CFD simulation or tracer gas methods), as the one in the standards is rather rough estimations.Keywords: Buoyancy-driven, natural ventilation, ventilation power, blower-door test, airflow in buildings.

Study of dynamic pressure on the packer for deep-water perforation

Open Physics ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 215-223
Author(s):  
Hao Huang ◽  
Qiao Deng ◽  
Hui Zhang
Keyword(s):  
Deep Water ◽  
Peak Pressure ◽  
Orthogonal Design ◽  
Dynamic Pressure ◽  
Three Dimensional ◽  
Calculation Model ◽  
Well Testing ◽  
Technical Problems ◽  
Wellbore Pressure ◽  
Three Dimensional Finite Element

Abstract The packer is one of the most important tools in deep-water perforation combined well testing, and its safety directly determines the success of perforation test operations. The study of dynamic perforating pressure on the packer is one of the key technical problems in the production of deep-water wells. However, there are few studies on the safety of packers with shock loads. In this article, the three-dimensional finite element models of downhole perforation have been established, and a series of numerical simulations are carried out by using orthogonal design. The relationship between the perforating peak pressure on the packer with the factors such as perforating charge quantity, wellbore pressure, perforating explosion volume, formation pressure, and elastic modulus is established. Meanwhile, the database is established based on the results of numerical simulation, and the calculation model of peak pressure on the packer during perforating is obtained by considering the reflection and transmission of shock waves on the packer. The results of this study have been applied in the field case of deep-water well, and the safety optimization program for deep-water downhole perforation safety has been put forward. This study provides important theoretical guidance for the safety of the packer during deep-water perforating.

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