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Title Cavitation instabilities and rotordynamic effects in turbopumps and hydroturbines : turbopump and inducer cavitation, experiments and design / Luca d'Agostino, Maria Vittoria Salvetti, editors
Published Cham : Springer, 2017
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Description 1 online resource
Series CISM International Centre for Mechanical Sciences. Courses and lectures ; volume 575
Courses and lectures ; v. 575
Contents Preface; Contents; 1 An Introduction to Cavitation in Inducers and Turbopumps; Abstract; 1 General Aspects of Cavitation; 2 Cavitation Nuclei; 3 Forms and Occurrence of Cavitation; 4 Classical Theory of Cavitation Scaling; 5 Cavitation and Bubble Dynamics; 6 Thermal Cavitation Effects; 7 Steady Cavitation in Turbomachines; 8 Flow-Induced Instabilities in Turbomachines; 9 Flow Stability of Pumping Systems; 10 Flow Stability of Cavitating Turbopump Systems; 11 Conclusions; References; Experimental Methods for the Study of Hydrodynamic Cavitation; 1 Introduction
2 Characterization and Management of Water Quality2.1 Dissolved Gas Content; 2.2 Free Gas Content and Cavitation Nuclei; 2.3 Direct Measurement of the Cavitation Nuclei Distribution; 2.4 Indirect Measurement of the Cavitation Nuclei Distribution; 2.5 Management of Water Quality; 3 Detection and Measurement of Incipient Cavitation; 3.1 Detection of Inception with Acoustic, Vibration, and Force Measurements; 3.2 Optical Measurement and Light Scattering for Inception Detection; 4 Optical Measurement of the Cavitating Flow Field; 4.1 High-Speed Imaging
2.4 Cause of Higher Frequency Oscillations2.4.1 Unsteady Calculation; 2.4.2 Rotating Modes Due to Interaction; 3 Conclusions; Acknowledgements; 5 Rotordynamics of Turbopumps and Hydroturbines; 1 Introduction; 2 Example of Forced and Self-Excited Vibrations in Pumps; 3 Effects of Rotordynamic Force and Moment on Rotordynamic Instability; 4 Rotordynamic Forces on Centrifugal Impellers; 4.1 Two-Dimensional Impeller in a Vaneless Space; 4.2 Interaction with Volutes and Vaned Diffusers; 4.3 Rotordynamic Forces on the Shroud; 4.4 Rotordynamic Problem in a Rocket Turbopump
4 Three-dimensional Simulation of Cavitation Instabilities1 Three-Dimensional Simulation of Cavitation Instabilities; 1.1 Simulation of Alternate Blade Cavitation (Kang et al. 2009a); 1.2 Simulation of Rotating Cavitation; 2 Suppression of Rotating Cavitation Using a Circumferential Groove on the Casing; 2.1 Design of Circumferential Grooves; 2.2 Flow Characteristics; 2.3 Experimental Results; 2.3.1 Non-cavitating Performance; 2.3.2 Suction Performance; 2.3.3 Cavitation Instabilities; 2.3.4 Cavity Geometry; 2.3.5 Propagation of Backflow Vortex Cavity
4.2 Laser Doppler Velocimetry and Light Scattering Methods4.3 Particle Imaging Velocimetry; 5 Measurement of Cavity Flows with High Void Fraction; 5.1 Surface Pressure, Acceleration, and Forces; 5.2 Electrical Impedance Probes; 5.3 Fiber Optic Probes; 5.4 Ionizing Radiation; References; 3 An Introduction to Flow-Induced Instabilities in Rocket Engine Inducers and Turbopumps; Abstract; 1 Introduction; 2 Rotating Stall; 3 Rotating Cavitation; 4 Other Rotating Instabilities; 5 Cavitation Surge; 6 Higher Order Cavitation Instabilities; 7 Conclusions and Perspectives; References
Summary The book provides a detailed approach to the physics, fluid dynamics, modeling, experimentation and numerical simulation of cavitation phenomena, with special emphasis on cavitation-induced instabilities and their implications on the design and operation of high performance turbopumps and hydraulic turbines. The first part covers the fundamentals (nucleation, dynamics, thermodynamic effects, erosion) and forms of cavitation (attached cavitation, cloud cavitation, supercavitation, vortex cavitation) relevant to hydraulic turbomachinery, illustrates modern experimental techniques for the characterization, visualization and analysis of cavitating flows, and introduces the main aspects of the hydrodynamic design and performance of axial inducers, centrifugal turbopumps and hydo-turbines. The second part focuses on the theoretical modeling, experimental analysis, and practical control of cavitation-induced fluid-dynamic and rotordynamic instabilities of hydraulic turbomachinery, with special emphasis on cavitating turbopumps (cavitation surge, rotating cavitation, higher order cavitation surge, rotordynamic whirl forces). Finally, the third part of the book illustrates the alternative approaches for the simulation of cavitating flows, with emphasis on both modeling and numerical aspects. Examples of applications to the simulation of unsteady cavitation in internal flows through hydraulic machinery are illustrated in detail
Notes Online resource; title from PDF title page (EBSCO, viewed March 24, 2017)
Subject Hydraulic machinery -- Design.
Pressure vessels -- Fluid dynamics.
Form Electronic book
Author D'Agostino, Luca, editor
Salvetti, Maria Vittoria, editor
ISBN 3319497170
3319497197 (electronic bk.)
9783319497174
9783319497198 (electronic bk.)