Инд. авторы:	Chirkov D., Scherbakov P., Skorospelov V., Cherny S., Zakharov A.
Заглавие:	Numerical simulation of air injection in Francis turbine
Библ. ссылка:	Chirkov D., Scherbakov P., Skorospelov V., Cherny S., Zakharov A. Numerical simulation of air injection in Francis turbine // IOP Conference Series: Earth and Environmental Science. - 2019. - Vol.240. - Iss. 2. - Art.022043. - ISSN 1755-1307. - EISSN 1755-1315.
Внешние системы:	DOI: 10.1088/1755-1315/240/2/022043; РИНЦ: 38662770; SCOPUS: 2-s2.0-85063889149; WoS: 000560282600043;
Реферат:	eng: Operation of Francis turbines in part load and sometimes in full load operating points is associated with increased pressure pulsations. One of the practical ways to reduce these pulsations is to add atmospheric air into the flow. It was shown previously that air injection/admission through the center of the runner cone can significantly reduce the amplitude of pressure pulsations both in part load and in full load operating points. Up to now the effect of flow aeration has been investigated mainly experimentally. In the present paper we performed CFD simulations of this phenomenon. Computations have been carried out in frames of homogeneous three-phase 'liquid - vapor - non-condensable gas' mixture model. Air phase has been assumed incompressible. Both part load and full load operating points have been considered with different air flow rates. Computations have shown that even at small flow rate the air changes the structure of the swirling flow downstream the runner and considerably reduces pressure pulsations, caused by vortex rope rotation. The obtained results are in agreement with corresponding experimental data for model turbine. © 2019 Published under licence by IOP Publishing Ltd.
Издано:	2019
Физ. характеристика:	022043
Конференция:	Название: 29th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2018 Даты проведения: 2018-09-16 - 2018-09-21