The Fluid Dynamic Basis for Actuator Disc and Rotor Theories Revised Second Edition
The first rotor performance predictions were published by Joukowsky exactly 100 years ago. Although a century of research has expanded the knowledge of rotor aerodynamics enormously, and modern computer power and measurement techniques now enable detailed analyses that were previously out of reach,...
| Autor principal: | |
|---|---|
| Formato: | Libro electrónico |
| Idioma: | Inglés |
| Publicado: |
Sydney :
IOS Press, Incorporated
2022
2022. |
| Edición: | 1st ed |
| Materias: | |
| Ver en Biblioteca Universitat Ramon Llull: | https://discovery.url.edu/permalink/34CSUC_URL/1im36ta/alma991009701627306719 |
Tabla de Contenidos:
- Intro
- Title Page
- Preface
- Reading guide
- Acknowledgement
- Nomenclature
- More than a century of rotor research
- Introduction
- History of the actuator disc momentum theory
- The British School
- The German and Russian School
- The contribution of Joukowsky and Betz to the vortex theory of propellers
- The Betz-Joukowsky limit for wind turbines
- From actuator disc to rotor aerodynamics
- Why this book?
- Force fields in fluid dynamics
- Introduction
- The equation of motion and the coordinate systems
- Equivalence of the kinematic and dynamic methods
- Conservative and non-conservative force fields
- Force fields and energy
- Work done by force fields
- Choice of reference system
- Work done by non-conservative force fields
- Pressure as a conservative force in momentum balances
- Pressure interpreted as potential energy
- Definition of (non-)conservative forces as used in this book
- Evaluation
- Force fields and vorticity
- Introduction
- The role of Helmholtz's conservation laws
- Generation of actuator disc vorticity
- Convection of actuator disc vorticity
- Convection of rotor vorticity
- Evaluation
- The disc as representation of a rotor
- Introduction
- Loads and power of a Joukowsky disc and rotor
- The actuator disc equation
- The rotor blade
- Power and thrust coefficients for Joukowsky discs / rotors
- The transition from a B-bladed rotor to the Joukowsky disc
- Comparison of the flow fields of a disc and rotor
- Evaluation
- Analysis of Froude's actuator disc flows
- Introduction
- One-dimensional momentum theory
- The momentum balance
- Momentum theory without conservative forces
- Momentum theory including conservative forces, applied to a stream annulus
- Numerical assessment of Froude's actuator disc performance
- The model and accuracy of computation.
- Comparison of calculated performance with momentum theory results
- Comparison with experimental results
- Flow details
- Flow and pressure patterns
- Properties of the wake boundary
- Pressure and velocity at the disc
- Pressure at the axis
- Evaluation
- Analysis of Joukowsky's actuator disc flows
- Introduction
- Two-dimensional momentum theory
- The equations for a Joukowsky disc
- The disc load
- The far wake outside the vortex core
- The vortex core
- The momentum, mass and energy balance
- Limit values of the Joukowsky momentum theory
- Results for , 0.
- Propeller discs with a wake of constant radius or with wake expansion
- The static disc or disc in hover
- The maximum efficiency of a wind turbine disc
- The efficiency of propeller discs
- Numerical assessment of flow details
- The numerical model
- Comparison of wind turbine and propeller discs at =1
- Comparison of a wind turbine and propeller disc with similar wake expansion
- The role of swirl and conservative pressure distributions
- Comparison of the Joukowsky and Betz-Goldstein solutions
- Evaluation
- The velocity distribution at the disc
- Introduction
- The absolute velocity
- Wind turbine flows
- Propeller flows
- Explanation of the (non-)uniformity of vs
- The axial velocity
- Momentum balance per annulus
- An engineering model for the axial velocity at a high wind turbine disc
- The radial velocity
- Evaluation
- Special topics: cons. loads at a thick disc &
- blade tip
- Introduction
- The generation of a Rankine vortex
- Wu's actuator disc equation
- The force field required to generate a Rankine vortex
- Interpretation of the radial component of the load
- Numerical assessment of the impact of the radial load
- The rotor blade
- Inboard motion of a tip vortex of a wind turbine blade.
- Side step: conservative, spanwise load on an elliptic wing
- Conservative and non-conservative blade loads
- Experimental and numerical results for a model wind turbine rotor
- Determination of the conservative tip load
- The tip vortex trajectory
- The role of conservative forces
- Evaluation
- From disc theory to BEM models: the tip correction
- Introduction
- Development of the tip correction
- In BEM methods
- In actuator disc, actuator line and lifting line methods
- The distribution of the axial velocity
- The radial distribution
- The azimuthal distribution: averaged or at blade position
- The azimuthal distribution: decambering of aerofoils
- The radial distribution of blade
- The aspect ratio as a measure for tip effects
- Conservative tip load and the tip vortex trajectory
- Evaluation
- Epilogue
- Vector expressions in cylindrical coordinates
- Balance of angular momentum
- The blade load expressed as pressure distribution
- The potential flow model
- Components of the model
- Convergence scheme
- Verification, sensitivity and accuracy
- Bibliography
- Index.
