Abstract
In the presented work, a new version of the design of the flow-through part of the main circulation pump for NPPs with increased energy indices is proposed. This design solution allows to increase the efficiency of the pump from 82 -83% to 88-89%. Numerical hydrodynamic calculations of the viscous fluid flow in the ANSYS CFX environment of various variants of the pump design have been performed: a spherical chamber with guide vanes, a spiral tap, a spiral tap with discharge openings in a spherical chamber (new design). As a result of the hydrodynamic calculations, the values of the hydraulic efficiency of the variants considered were obtained. As a result of the analysis of the pattern of the flow of the investigated variants, it is established that the proposed version of the pump with unloading holes has additional hydraulic losses due to circulation of the flow through them. The value of the circulation of the flow through the discharge openings is numerically obtained. The cause of the detected effect was investigated. As a result of the conducted research it is established that it is possible to further increase the efficiency of the proposed pump design by optimizing the geometry of the discharge openings.
Highlights
In the presented work, a new version of the design of the flow-through part of the main circulation pump for NPPs with increased energy indices is proposed
В этом случае спиральный отвод не воспринимает внешних самых значительных нагрузок, а только выполняет функцию раскрутки и отвода потока за рабочим колесом
Иванов Евгений Александрович – инженер ОАО НПО ЦКТИ
Summary
A new version of the design of the flow-through part of the main circulation pump for NPPs with increased energy indices is proposed. Полный КПД насоса данного конструктивного исполнения находится на уровне 82‒83% [7,8,9]. Однако КПД данного варианта значительно превосходит вариант с направляющим аппаратом и находится на уровне 89% [10-13]. Использование разгрузочных отверстий необходимо для выравнивания статического давления между сферическим корпусом и спиральным отводом. Предложенный вариант конструкции должен совмещать в себе положительные качества существующих вариантов, это высокий уровень КПД ‒ на уровне варианта 2 при стоимости изготовления, сопоставимой с вариантом 1.
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