Open AccessTransient phenomena in the draft tube model of a Francis hydro-turbine
Author(s) -
Daniil Suslov,
Ivan V. Litvinov,
Evgeny Gorelikov,
С. И. Шторк
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1359/1/012016
Subject(s) - draft tube , turbine , mechanics , transient (computer programming) , aerodynamics , vortex , flow (mathematics) , francis turbine , parametric statistics , physics , control theory (sociology) , computer science , mathematics , thermodynamics , statistics , operating system , control (management) , artificial intelligence
This article is devoted to the study of pressure pulsations behind the runner of a hydro turbine model caused by the precessing vortex core (PVC). Pressure pulsations are investigated under conditions of stationary load and transient modes of the hydro-turbine operation. Studies were performed in model conditions on the aerodynamic setup. The map of pressure pulsations was built for stationary modes using acoustic sensors and served to find rotational speeds of the swirler and flow rates at which the PVC occurs. On the basis of the data presented by parametric dependences, the initial and final parameters of the transition process were chosen. In the article, a sudden (fast) transition from part-load regime to the best efficiency point and back was considered. The characteristic times for the formation of PVC and the establishment of the flow regime when changing the controlling parameters of the installation have been determined using a continuous wavelet transform.