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쉬레스트 우즈왈,김대훈,최영도 한국유체기계학회 2023 한국유체기계학회 논문집 Vol.26 No.6
High pumping performance is essential for the boiler in industrial processes and thermal power plants. The multistage centrifugal pump is one of the options for the boiler feed pump because it can deliver a wide range of head and flow rates. The boiler feed pump operates at a wide range of temperatures, and the working fluid properties are sensitive to the temperature. The change in the thermodynamic properties of the working fluid (viscosity, density, and thermal conductivity) will affect the head and efficiency of the multistage centrifugal pump. Besides the hydraulic performance of multistage centrifugal pumps, the thermodynamic properties of the working fluid will adversely affect the structural stability of the pump. It is necessary to understand the influence of working fluid thermodynamic properties on the performance of a multistage centrifugal pump to design and operate the pump appropriately.
쉬레스트 우즈왈,김필제,최영도 한국유체기계학회 2023 한국유체기계학회 논문집 Vol.26 No.5
Regenerative blowers can produce a high head with a small flow rate, which makes them desirable compared to positive displacement pumps. The regenerative blower consists of an impeller and casing. The impeller shape contributes to the performance of the regenerative blower. CFD analysis is conducted to investigate the effect of geometrical modification on the operating condition of regenerative blowers like head, power, and efficiency. The geometry modification of the regenerative blower is achieved by varying the impeller blade curvature radius, blade inclination angle, blade shape (curved, radially straight, and chevron), and impeller disk side gap passage shape. The various impeller blades and impeller disk side gap passage designs were selected and conducted the CFD analysis to evaluate the regenerative blower performance and internal flow behavior. Study results show that changing the blade shape from curved to radially straight type can improve the blower’s performance.