WATER AERATION SYSTEM FOR HYDRAULIC TURBINES

The invention relates to a water aeration system for hydraulic turbines which is integrated in the cone of the hydraulic turbine suction apparatus, in order to increase the content of oxygen dissolved in the turbinated water of hydroelectric power plants. According to the invention, the system comprises a device for water aeration through hydraulic turbines integrated in the internal geometry of a turbine suction cone and perfectly adapted thereto, which consists of an air chamber (CA) having the internal wall made of some perforated plates (1) fixed on a supporting grid (2), so that they completely or partially cover the internal wall which is in contact with the turbinated water flow, the air chamber (CA) being provided with an upstream wall (3), a downstream wall (4) and an external jacket (5) on which some air intake pipes (6) are equally spaced for natural aeration of air at atmospheric pressure, which are provided with some electrically-operated valves (7) having the role of adjusting the air flow-rate, some air injection pipes (8) for forced aeration of air with the role of controlled injection of pressure and flow-rate of compressed air, a discharge nozzle (9) for the water entering from the hydraulic circuit of the turbine into the air chamber (CA), continued with an upstream section (18) provided with a pressure transducer, and a downstream section (19), where it is fixed to the suction cone of the turbine by means of an upstream flange (20) and a downstream flange (21) and the plates (1) which, along with the grid (2), make up the internal geometry of the original turbine cone, have some calibrated orifices with diameters in the range of 0.2...5 mm, equally spaced at a pitch of 3...7 diameters, in order to prevent bubble coalescence while flowing from the turbine, depending on the void ratio admitted upon flowing from the turbine, the air intake in the turbine being performed depending on the pressure level in the turbine and the dissolved oxygen deficiency in the water, by actuating an aeration control module. Invenţia se referă la un sistem de aerare a apei pentru turbine hidraulice, integrat în conul aspiratorului turbinei hidraulice, cu scopul de a creşte conţinutul de oxigen dizolvat din apa turbinată din centralele hidroelectrice. Sistemul conform invenţiei cuprinde un dispozitiv de aerare a apei prin turbine hidraulice, care se integrează şi respectă întocmai geometria interioară a conului aspirator al unei turbine, şi care este alcătuit