Improving the efficiency of the operating process of high specific speed torque-flow pumps by upgrading the flowing part design

Abstract

The article is devoted to the research of the torque-flow pump operating process. Its work is closely connected to the formation and stable functioning of the toroidal vortex. The theoretical bases of the formation of a toroidal vortex and the process of energy transfer in a torque-flow pump are considered in the research (vane and vortex components of the operating process). The fact of the presence of some additional hydraulic losses due to the mismatch of the location of the toroidal vortex center and the impeller blade edges has been established. The urgency of the paper is increasing the efficiency of torque-flow pump by improving its flowing part. The upgrade of the pump consists of the theoretical justification and practical implementation of the reduction of these additional hydraulic losses. In this aspect, the location of the impeller blade edge is aligned with the toroidal vortex center. The research was performed by conducting a numerical investigation. The calculations of a high specific speed torque-flow pump of three different design configurations of the impeller blades were performed. Practically confirmed increasing of the head (by 3.2 m) and efficiency (by 7-8%) of the pump with the second design of the impeller blades.

Створення Нового Покоління Енергоефективних Вільновихрових Насосів У Контексті Стратегії Підвищення Їх Конкурентоздатності

“…Основним є нижчий, порівняно з іншими типами насосів коефіцієнт корисної дії, котрий зазвичай не перевищує 58%. Це пов'язано з певними особливостями робочого процесу насосів, котрий одночасно включає в себе вихровий та лопатевий процеси [2].…”

The influence of the impeller design features on the combined operating process of the torque-flow pump

“…the transition to an analogue of a twotiered impeller in a centrifugal pumps, leads to increasing pump head and efficiency and reaches a maximum when the length of the short blades is approximate ly half of the length of long blades. In this case, the pump ef ficiency can increase up to 2-3 % [12].…”

“…When the impeller is extended to the free chamber, the efficiency increases, which can be justified by increasing of the intensity of the flow and decreasing of hydraulic losses during the rotation of the liquid in the pump free chamber. At the same time, the bestefficiency point (BEP) mode of the pump operation shifts towards higher flow rates [12].…”