Hydrodynamics of decelerated swirling flows

Description

Monografia tratează într-o manieră clară și concisă curgerea decelerată cu vârtej funie în conul tubului de aspirație din turbinele hidraulice Francis. Tema abordată este actuală și de interes atât pentru mediul academic, dar mai ales pentru mediul industrial, care se confruntă cu nevoia dezvoltării unor turbine capabile să funcționeze pe o plajă extinse de debite, fără să apară fenomenul de vârtej funie.

Contents

Introduction and problem definition

- The decelerated swirling flow in hydraulic turbines

- Literature review for the decelerated swirling flow in the draft tube cone of hydraulic turbines

Description of the experimental test rig existing in the Politehnica University laboratory

- The experimental test rig developed at the Politehnica University Timisoara laboratory

- Design of the first convergent-divergent test section for the swirl generator

- Vortex rope visualisation with the old test section and swirl generator

- Hydrodynamic design of the novel convergent-divergent test section for the swirl generator

- Design of the central body shape (the ogive)

- Technological approximation of the duct and nozzle shape           

- Mechanical design of the novel swirl generator: the swirl apparatus and the convergent-divergent test section

- Mechanical description of the new swirl generator

- Constructive description of the test section for velocity measurements

- Constructive description of the test section for pressure measurements

- Vortex rope visualisation with the new swirl generator

- Investigation of the velocity profiles for the vortex rope case and water jet injection method

- Investigation of the unsteady pressure from the discharge cone in case of vortex rope and water injection method

- Averaged pressure analysis

- Unsteady pressure analysis

- Pressure signal decomposition

Methods developed at UPT to mitigate the discharge cone instabilities in hydraulic turbines

- Free runner downstream the main hydraulic turbine runner

- Flat free runner downstream the main hydraulic runner

- Radial-axial water jet

- Self-adjusted diaphragm

Bibliography