Book contents
- Radial Flow Turbocompressors
- Radial Flow Turbocompressors
- Copyright page
- Dedication
- Contents
- Credits
- Introduction
- Preface
- Acknowledgements
- Conventions and Nomenclature
- 1 Introduction to Radial Flow Turbocompressors
- 2 Energy Transfer
- 3 Equations of State
- 4 Efficiency Definitions for Compressors
- 5 Fluid Mechanics
- 6 Gas Dynamics
- 7 Aerodynamic Loading
- 8 Similarity
- 9 Specific Speed
- 10 Losses and Performance
- 11 Impeller Design
- 12 Diffuser Design
- 13 Casing Component Design
- 14 Geometry Definition
- 15 Throughflow Code for Radial Compressors
- 16 Computational Fluid Dynamics
- 17 Compressor Instability and Control
- 18 Maps and Matching
- 19 Structural Integrity
- 20 Development and Testing
- References
- Index
14 - Geometry Definition
Published online by Cambridge University Press: 08 July 2021
- Radial Flow Turbocompressors
- Radial Flow Turbocompressors
- Copyright page
- Dedication
- Contents
- Credits
- Introduction
- Preface
- Acknowledgements
- Conventions and Nomenclature
- 1 Introduction to Radial Flow Turbocompressors
- 2 Energy Transfer
- 3 Equations of State
- 4 Efficiency Definitions for Compressors
- 5 Fluid Mechanics
- 6 Gas Dynamics
- 7 Aerodynamic Loading
- 8 Similarity
- 9 Specific Speed
- 10 Losses and Performance
- 11 Impeller Design
- 12 Diffuser Design
- 13 Casing Component Design
- 14 Geometry Definition
- 15 Throughflow Code for Radial Compressors
- 16 Computational Fluid Dynamics
- 17 Compressor Instability and Control
- 18 Maps and Matching
- 19 Structural Integrity
- 20 Development and Testing
- References
- Index
Summary
This chapter describes the essential aspects of geometry definition of flow channels, blades and vanes in radial compressors. The impeller blades and flow channel make up a complex three-dimensional shape, and a general method for defining such geometries using Bezier surfaces is described. The meridional channel is defined as a series of Bezier patches whose geometry is parametrised to allow changes to be made quickly and efficiently during the design. Radial compressor impeller blades are typically defined as a distribution of camber line angle and thickness on the hub and casing meridional sections. A three-dimensional shape is generated by joining the hub and casing sections by straight lines to make up a ruled surface. This simplifies simplify manufacture by flank milling. In transonic flows, a more complex definition is used in which the geometry is defined along a series of separate meridional planes. A description of the definition of asymmetric components, such as the volute, is also provided.
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- Radial Flow TurbocompressorsDesign, Analysis, and Applications, pp. 466 - 479Publisher: Cambridge University PressPrint publication year: 2021