Abstract
The high-speed partial emission pump is a small flow and high-head pump, which has been widely used. To study the main factors affecting the performance of high-speed partial emission pumps, numerical simulation methods were used to calculate the performance parameters of high-speed partial emission pumps with and without inducers, and the external characteristic parameters were verified through comparison test values. The results show that the head of the high-speed partial emission pump with inducer is nearly 15 m higher than that of the high-speed partial emission pump without inducer. Considering the influence of air in the high-speed partial emission pump on the working performance, the two-phase flow with different flow rates, different particle sizes, and different concentrations was calculated, and the different liquid phase distributions, liquid phase velocity vector diagrams, and external characteristic curve were compared. The results show that under the same flow condition, the gas-phase particle diameter has the most severe influence on the external characteristic.
Highlights
Low flow rate, high head, and ultra-low specific speed centrifugal pump is always a difficult and hot topic in the field of centrifugal pump research [1, 2]. e partial emission pump, known as a tangent pump, Sundyne pump, or Barske pump, is a high-speed centrifugal pump with a small flow and high head
Because of its high head, high efficiency, simple and compact structure, flat head curve, and other advantages, it is widely used in aerospace, petrochemical, fire protection, and other fields and has become a strong competitor of the ordinary centrifugal pump [3]
Since the partial emission pumps are often accompanied by cavitation, noise, vibration, and other problems, the research on structural optimization and cavitation performance of partial emission pumps are important
Summary
High head, and ultra-low specific speed centrifugal pump is always a difficult and hot topic in the field of centrifugal pump research [1, 2]. e partial emission pump, known as a tangent pump, Sundyne pump, or Barske pump, is a high-speed centrifugal pump with a small flow and high head. Many scholars have discussed the influence of inducer on performance and flow field in the pump through a numerical simulation method [6, 7]. Gonzalez et al [8] proposed some new inducer design methods to solve the cavitation problem of high-speed partial emission pumps in the study of impeller-volute interference. Erefore, the study of two-phase flow can provide a basis for the optimization of the inducer and the influence on the cavitation performance [14, 15]. The numerical simulation results of the hydraulic performance of the pump are first verified by experiments, and the influence of the internal flow field and external characteristics of high-speed pumps with and without inducer is discussed. E main boundary conditions are as follows: velocity is adopted as the inlet boundary condition, and free flow is set as the outlet; the front and rear walls of the impeller, the wall of the volute, the walls of the inlet and outlet diversion section, and the water body were set as static walls; the wall of the impeller and the water body in the impeller were set to
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