Mixed-flow Pumps

Name: Mixed-flow Pumps | Modelling, Simulation, and Measurements
Brand: Wiley
Price: 115.99 EUR
Availability: OnlineOnly

Modelling, Simulation, and Measurements

Wei Li Leilei Ji Ramesh Agarwal Weidong Shi Ling Zhou(Autor*in)

Wiley (Verlag)

1. Auflage

Erschienen am 29. Mai 2024

336 Seiten

E-Book

PDF mit Adobe-DRM

Systemvoraussetzungen

978-1-119-91079-4 (ISBN)

115,99 €inkl. 7% MwSt.

Systemvoraussetzungen

für PDF mit Adobe-DRM

E-Book Einzellizenz

Als Download verfügbar

Beschreibung

Weitere Details

Weitere Ausgaben

Inhalt

Cover
Title Page
Copyright
Contents
Preface
Acknowledgments
List of Acronyms
List of Symbols
Chapter 1 Introduction
1.1 What Is a Mixed-flow Pump?
1.2 Types of Mixed-flow Pumps
1.3 Agricultural and Industrial Applications of Pumps
1.4 Summary
References
Chapter 2 Basic Concepts and Theory of Mixed-flow Pumps
2.1 Basic Flow and Performance Parameters
2.1.1 Volume Flow Q
2.1.2 Head H
2.1.3 Speed n
2.1.4 NPSH
2.1.5 Power and Efficiency
2.2 Typical Type of Flows in the Mixed-flow Pumps
2.2.1 Tip Leakage Flow
2.2.2 Rotating Stall
2.2.3 Cavitation Flow
2.3 Summary
Nomenclature
References
Chapter 3 Brief Review of Computational Fluid Dynamics
3.1 CFD as a Flow Simulation Tool
3.2 Geometry Modeling
3.3 Mesh Generation
3.4 Governing Equations of Fluid Dynamics
3.5 Simulation of Turbulent Flows
3.6 Turbulence Modeling
3.6.1 Standard k- Model
3.6.2 Shear Stress Transport (SST) k-? Model
3.6.3 Spalart-Allmaras (SA) Model
3.6.4 Wray-Agarwal (WA) Model
3.6.5 Detached Eddy Simulation Model
3.6.6 Large Eddy Simulation (LES) Model
3.7 Numerical Solution Algorithms
3.7.1 Numerical Discretization Method
3.7.2 Flow Field Solution Method
3.8 Near-wall Flow Treatment
3.9 Boundary Conditions
3.10 Uncertainty Analysis
3.11 Summary
Nomenclature
References
Chapter 4 Pump Performance Analysis Methods
4.1 Entropy Production Analysis
4.2 Vortex Identification and Vorticity Transport
4.2.1 Vortex Identification
4.2.1.1 Q-Criterion
4.2.1.2 Regularized Helicity Method
4.2.2 Vorticity Transport
4.3 Transient Flow Analysis Using the Wavelet Method
4.4 Summary
References
Chapter 5 Experimental Methods, Data, and Analysis
5.1 External Characteristics Experiment
5.1.1 Test Equipment and Instruments
5.1.2 Test Method for External Flow Characteristics of the Pump
5.1.3 Uncertainty Analysis of the Experiment
5.1.4 Test Results for External Flow Characteristics of the Pump
5.2 Experiment for Measuring Pressure Fluctuations
5.2.1 Experimental Procedure
5.2.2 Wavelet Transform of Pressure Pulsation for Different Tip Clearances
5.2.3 Coherence of Pressure Pulsation for Different Tip Clearances
5.3 PIV Measurement
5.3.1 Basic Principles of PIV Measurement
5.3.2 The PIV Image Processing System
5.3.3 PIV Measurement Criteria
5.3.4 PIV Testing Instruments and System
5.3.5 PIV Test Method
5.3.5.1 Selection and Addition of Tracer Particles
5.3.5.2 Calibration Apparatus
5.3.5.3 Lens Group, Camera Fixing, and Adjustment
5.3.5.4 Shooting Section of the Dynamic and Static Interference Flow Field
5.3.5.5 Positions of the Equipment and the Shooting Sections
5.3.6 Analysis of the PIV Results for the Flow Field of the Front Shaft Section of the Impeller Inlet
5.3.7 Relative Velocity Distribution at the Monitoring Lines in Different Phases at the Impeller Inlet and Outlet Under the Part-loading Conditions
5.4 Orbit of Shaft Centerline
5.4.1 Measurement of the Spindle Axis Trajectory
5.4.2 Characteristics of Vibrations of the Shaft System
5.4.3 Original Axis Trajectory Diagram and Time-domain Diagram
5.4.4 Decomposition and Refinement of the Rotor Axis-centered Trajectory
5.4.5 Flow Spectrum Analysis
5.4.6 Effect of the Rotor-Stator Interaction on the Shaft Vibration
5.5 Summary
References
Chapter 6 CFD Simulations of a Mixed-flow Pump Using Various Turbulence Models
6.1 Comparison and Validation of Numerical Results from Three Two-equation Turbulence Models (SST k-?, k-?, and Standard k- )
6.1.1 Comparison of Energy Performance
6.1.2 Comparison of CFD Results with Phase-Averaged Velocity Predictions from PIV
6.1.3 Flow Field Under Incipient Stall Condition
6.2 Application of Wray-Agarwal (WA) One-Equation Turbulence Model
6.2.1 Energy Performance Comparison
6.2.2 Comparison of the Flow Field in the Rotor-Stator Interaction Zone Using Different Turbulence Models
6.2.3 Comparison of Eddy Viscosity Variable R?=
?k/? in the Pump Using the Four Turbulence Models (SST k-?, k-?, k- , and WA)
6.3 Summary
References
Chapter 7 Tip Leakage Flow In a Mixed-flow Pump
7.1 Energy Characteristics
7.1.1 Comparison of Energy Performance of the Pump for Various Tip Clearances
7.1.2 Distribution of the Total Entropy Production in the Pump for Various Tip Clearances
7.1.3 Local Entropy Production Rate in the Impeller
7.1.4 Local Entropy Production Rate in the Guide Vane
7.2 Flow Structures
7.2.1 Vortex Patterns in the Blade Rim Region of the Pump for Various Tip Clearances
7.2.2 Tip Leakage Vortex (TLV) Intensity and the Vortex Core Distribution
7.3 Unsteady Flow Characteristics
7.3.1 Time-domain Analysis of the Pressure Pulsations
7.3.2 Frequency-domain Analysis of the Pressure Pulsation
7.4 Transient Flow Field Due to Rotor-Stator Interaction (RSI)
7.4.1 Flow Fields Before the RSI Zone
7.4.2 Flow Fields in the RSI Zone
7.4.3 Pressure Fluctuation in Partial-loading Conditions
7.4.3.1 Time-domain Analysis
7.4.3.2 Frequency-domain Analysis
7.5 Summary
References
Chapter 8 Rotational Stall in a Mixed-flow Pump
8.1 Energy Characteristics
8.1.1 Energy Performance of the Pump Along the Axial Flow Direction
8.1.2 Energy Loss Mechanism Under Stall Condition
8.1.2.1 Theoretical Analysis of Head Drop in Saddle Area
8.1.2.2 Flow Distribution in Each Channel
8.1.2.3 Region of the Maximum Energy Loss in the Impeller
8.2 Flow Structure in the Critical and Deep Stall Conditions
8.2.1 Flow Structure in the Impeller in the Design, Critical, and Deep Stall Conditions
8.2.2 Key Factors Causing the Energy Loss
8.2.2.1 Influence of the Inlet Swirl on Energy Loss
8.2.2.2 Influence of the Tip Leakage Vortex on the Energy Loss
8.2.2.3 Influence of the Stall Vortex on the Energy Loss
8.2.2.4 Influence of the Backflow Vortex on the Energy Loss
8.3 Effect of the Tip Clearance on the Rotating Stall
8.3.1 TLF Patterns and TLV Core Trajectories for Different Tip Clearances
8.3.2 Influence of the Inlet Swirl Flow and the TLV Characteristics
8.3.3 Distorted Flow in the Blade Rim Region Below the TLV
8.4 Propagation Characteristics of Rotating Stall
8.4.1 Pressure Fluctuation Characteristics of the Flow in the Stall Condition
8.4.2 Correlation Between the Transient Flow Field and the Energy Characteristics of the Pump
8.4.3 Morphology and Propagation Mechanism of Rotating Stall
8.5 Inducements for the Circumferential Propagation of the Rotating Stall
8.6 A Stall Prediction Model of the Mixed-flow Pump
8.6.1 Flow Characteristics During the Process of the Stall for Impellers with Different Blade Numbers
8.6.2 Quantitative Analysis of the Suction Surface Parameters of the Stalled Blades
8.6.3 The Pressure and Velocity Distributions on the Suction Side of the Blade of the Impellers with Various Blade Numbers
8.6.4 A Simple Stall Prediction Model
8.7 Summary
References
Chapter 9 Passive Suppression of Rotating Stall in Mixed-flow Pump
9.1 Introduction
9.2 Impeller Blade Rim Structures for Stall Suppression
9.2.1 Geometries of Various Blade Rim Structures
9.2.2 Results of Numerical Calculations for Various Blade Rim Structures
9.2.2.1 Comparison of the External Characteristics of the Pump for Various Blade Rim Structures
9.2.2.2 Influence of Blade Rim Geometry on the Flow Field in Rim Clearance Region
9.2.2.3 Influence of Blade Rim Structure on the Inlet Flow Angle of the Impeller
9.2.2.4 Distribution of Vortex Structures in the Impeller with Different Rim Structures
9.3 Influence of the Circumferential Spokes
9.3.1 The Structure of "O-Spoke"
9.3.2 Analysis of Results
9.3.2.1 External Characteristics Analysis
9.3.2.2 Analysis of the Flow Field in Various Cross-Sectional Areas of the Pump
9.3.2.3 Flow Field Analysis in the Impeller Shroud Region
9.3.2.4 Energy Performance Analysis Based on the Entropy Generation Theory
9.3.2.5 Analysis of the Blade Height Section Flow Field
9.4 Summary
References
Chapter 10 Cavitation in a Mixed-flow Pump
10.1 Numerical Model
10.1.1 Cavitation Model
10.1.2 Numerical Simulation Setup and Boundary Conditions
10.1.3 Cavitation Test Procedure
10.1.4 Comparison of Numerical Simulations and Cavitation Test Results
10.2 Flow Characteristics of the Mixed-flow Pump Under Cavitation
10.2.1 Blade Surface Load Distribution
10.2.2 Trajectory of TLV for Different Values of NPSHa
10.2.3 Evolution of the Transient Flow Trajectory of the TLV and Tip Cavitation Flow
10.3 Analysis of Cavitation Energy Characteristics
10.3.1 Analysis of Pump Energy Characteristics
10.3.2 Analysis of Energy Loss in the End Wall Region of the Pump Caused by the TLV-Induced Cavitation
10.3.3 Effect of Cavitation on the Output Power of the Pump
10.3.4 Effect of Cavitation on Energy Losses in the Pump
10.4 Summary
References
Chapter 11 Analysis of the Vortex Dynamics Characteristics in the Tip Region of the Mixed-flow Pump Under Cavitation
11.1 The Tip Leakage Flow Characteristics Under Cavitation
11.1.1 Tip Leakage Flow Characteristics
11.1.2 Evolution of the Vorticity and Its Intensity
11.1.3 Turbulent Kinetic Energy Distribution in the Blade Tip Region
11.2 Analysis of the Vorticity Transport Characteristics in the Tip Region
11.2.1 Radial Vorticity Transport in the Cavitation Region Near the Blade Tip
11.2.2 Circumferential Transport of Vorticity
11.2.3 Transport of the Axial Vorticity
11.2.4 Quantitative Evaluation of the Vorticity Transport Terms
11.3 Summary
References
Chapter 12 Multiphase Flow Simulations of Sediment Particles in Mixed-flow Pumps
12.1 Introduction
12.2 Governing Equations of the Mixture Model of Multiphase Flow
12.3 Pump Model and Mesh Generation
12.4 Two-phase Flow Characteristics of the Solid-Liquid Flow in Mixed-flow Pumps
12.4.1 Influence of the Solid Particles on the Energy Characteristics of the Mixed-flow Pumps
12.4.1.1 Influence of the Solid Particles on the Pump Head and Efficiency in Various Flow Conditions
12.4.1.2 Influence of Different Volume Fractions of Solid Phase on the Pump Head and Efficiency
12.4.2 Distribution of the Solid Phase Inside the Impeller of the Pump
12.4.3 Analysis of the Energy Loss in the Mixed-flow Pump
12.4.4 Analysis of the Energy Loss Inside the Impeller
12.5 Two-phase Flow Characteristics in the Guide Vane of Mixed-flow Pumps
12.5.1 Distribution of Solid Particles in the Guide Vane of a Mixed-flow Pump
12.5.2 Analysis of the Energy Loss in the Guide Vane
12.6 Summary
References
Index
EULA

Systemvoraussetzungen

Als PDF speichern Als Link merken