Ferreirolo ® 03-Jan-2021 20:51

Cavitation Instabilities and Rotordynamic Effects in Turbopumps and Hydroturbines

Year: 2017
Language: english
Author: Luca d'Agostino and MariaVittoriaSalvetti editors
Genre: Technical book
Publisher: Springer
Edition: 1
ISBN: 978-3-319-49719-8
Format: PDF
Quality: eBook
Pages count: 288
Description: The attainment of higher power densities in modern hydraulic turbomachinery is invariably obtained by running the impeller at the maximum allowable speed and lower shaft torque. Accordingly, operation under cavitating conditions can occur under special circumstances in hydroturbines and nuclear power plant cooling systems and is often tolerated in liquid propellant rocket feed systems, exposing the machine to the onset of dangerous self-sustained, cavitation-induced fluid dynamic and rotordynamic instabilities. Since these phenomena actually represent the major source of life and reliability degradation of the machine, fundamental information on their nature and behavior is of crucial importance for the effective design of today’s high-performance hydraulic turbomachinery. However, the extreme com- plexity and imperfect understanding of the phenomena involved pose formidable obstacles to the modeling, prediction, and control of cavitation-induced instabilities. For this reason, nowadays theoretical analyses and simulations alone are still of limited value for the solution of specific technical problems and progress in this field must rely on the support of dedicated experimentation.
The objective of this monograph consists in providing the reader with a com- prehensive approach to the physics, fluid dynamics, modeling, experimentation, and numerical simulation of cavitation phenomena and their implications on the design and operation of high-performance hydraulic turbomachinery. The material pre- sented herein is, therefore, intended to illustrate some of the most recent advancements concerning both the occurrence of cavitation-induced instabilities and rotordynamic effects in high-performance turbopumps and hydroturbines, as well as the development of more refined and efficient numerical tools for the simulation of the complex cavitating flows involved in these machines.
The book contains most of the material presented in the lectures given by some of the world leading experts at the advanced school Cavitation Instabilities and Rotordynamic Effects in Turbopumps and Hydroturbines, held at the Centre International des Sciences Mecaniques (CISM), Udine, Italy, in July 2014.



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