Improvement of Internal Flow Performance of a Centrifugal Pump-As-Turbine (PAT) by Impeller Geometric Optimization

Xu, Jianzhong; Wang, Longyan; Asomani, Stephen Ntiri; Luo, Wei; Lu, Rong

doi:10.3390/math8101714

Cited by 14 publications

(5 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are 1000 groups of Pareto-optimal solutions achieved by the PBGA, which is shown in Figure 6. Details of the PaT geometrical optimization procedures are referred in the authors previous publication, 49 and the geometric parameters of different impeller model are list in Table 4. Particularly, three descriptive optimized cases are chosen to analyze the effectiveness of the geometrical optimization of PaT impeller on the output performance from the point view of the entropy production.…”

Section: Geometrical Optimizationmentioning

confidence: 99%

Performance analysis of geometrically optimized PaT at turbine mode: A perspective of entropy production evaluation

Wang

Luo

Zhang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

Self Cite

View full text Add to dashboard Cite

In the field of hydroelectric power, Pump as Turbine (PaT) is an important tool to achieve recycling the redundant kinetic energy in small stream/rivers. However, due to the contradiction between the reverse fluid flow working at turbine mode and the designed flow passage of pump geometry, the internal hydraulic loss in PaT is excessive. As a result, it renders the PaT performance extremely low affecting its wide applications with the demand of high efficiency operation. Therefore, this paper aims to optimize the geometric parameters of the impeller in PaT turbine mode under three different typical flow conditions (i.e. rated, best efficiency, and overload working conditions). After the geometric optimization, the internal energy losses among the flow passages are analyzed by using the entropy production method. The results show that the impeller passage exhibits obviously higher entropy loss in comparison to the volute and the outlet pipe. Inside the impeller, the blade leading and trailing edges on both suction and pressure sides are the locations where the majority of the impeller energy losses occur, and the high entropy area is concentrated at the impeller inlet area. Moreover, The energy loss gradually decreases from blade leading edge (BLE) to blade trailing edge (BTE), and the entropy production decreases from the blade pressure side (PS) to the blade suction side (SS) due to the large mixing flow loss from PS to SS. It is concluded that the entropy production analysis is effective in explaining the PaT power losses caused by the geometric mismatch of different components including inlet, impeller, and outlet, providing the reference value for the geometric optimization of other turbine machinery.

show abstract

Section: Geometrical Optimizationmentioning

confidence: 99%

Performance analysis of geometrically optimized PaT at turbine mode: A perspective of entropy production evaluation

Wang

Luo

Zhang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the process of constant iteration, optimization calculation is carried out by the Isight platform, while the algorithm is embedded in the platform. It needs to adjust the optimization parameters and variables without compiling separately [33].…”

Section: Setting Valuementioning

confidence: 99%

Comparative Investigation on Hydrodynamic Performance of Pump-Jet Propulsion Designed by Direct and Inverse Design Methods

et al. 2021

Self Cite

View full text Add to dashboard Cite

Pump-jet propulsion, a new propulsion technology, is primarily designed for underwater vehicles. Because of its concealment and excellent performance, it has been widely used, but due to its confidentiality and complexity, few studies have been published. To explore the relevant design theory of pump-jet propulsion with the aim of increasing its performance, in this study, we applied the direct and inverse design methods to construct a three-dimensional pump-jet model. The direct design method was carried out by comparing the lifting and lifting-line design methods, followed by further geometric optimization of the better model. In a numerical study using computational fluid dynamics (CFD) simulations, the Reynolds Averaged Naviere-Stokes (RANS) equations with SST k-ω turbulence model were solved in a cylindrical computational domain around the pump-jet propulsion device. A numerical investigation of the E779A propeller was carried out beforehand, using different advance ratios, in order to validate the accuracy of the numerical simulation method. The results show that for the direct method, although the model designed using the lifting-line method produced a greater thrust and the pump-jet designed using the lifting method was more efficient and stable, which is more suitable for small and medium underwater vehicles. When considering the inverse design method, the pump-jet propeller obviously accelerated the fluid, and the speed was obviously greater than that designed using the direct design method, while the turbulent kinetic energy in the flow field was higher, as well as the energy loss. Therefore, for small- and medium-sized underwater vehicles, if the priorities are high thrust and high efficiency, the inverse design method is the best option, whereas if stability and lower energy loss are preferred, the direct design method should be adopted.

show abstract

“…For a high-quality and relatively inexpensive assessment of the machine, it is advisable to use numerical flow modelling (CFD -Computational fluid dynamics). The entire CFD assessment is a fundamental element for further decision-making, whether a total replacement of the technology is necessary, or it is economically advantageous to replace only specific parts of the machine unit [5].…”

Section: Introductionmentioning

confidence: 99%

Reverse engineering of pump as turbine for CFD analysis

Souček,

Bílková,

Nowak

2024

Acta Polytech

View full text Add to dashboard Cite

Reverse engineering (RE) using 3D scanning is already a relatively technologically simple and cost-effective method. For water turbines, this is particularly true for RE of larger machines. With microturbines, there is a lot of pressure to minimise costs, even at the cost of reduced accuracy. Using an existing micro-PAT (Pump as Turbine) as an example, we showed the approach to assessing these microturbines, starting with scanning the entire internal flow profile of the turbine, reconstructing the surface into a 3D model, and numerically assessing it using CFD (Computational Fluid Dynamics). A different approach is necessary compared to standard large machines, whose dimensions allow troublefree scanning of the flow parts of the turbine. Using CFD, we assessed the reconstructed geometry of the PAT. Two significant findings were made: the importance of high-quality 3D scanning by combining several cheaper 3D scanners and the necessity for reliable in-situ measurements for a successful CFD validation. Our future focus involves optimising PAT runner geometry in turbine mode to enhance energy production at the site and, at the same time, eliminating existing cavitation.

show abstract

Improvement of Internal Flow Performance of a Centrifugal Pump-As-Turbine (PAT) by Impeller Geometric Optimization

Cited by 14 publications

References 25 publications

Performance analysis of geometrically optimized PaT at turbine mode: A perspective of entropy production evaluation

Performance analysis of geometrically optimized PaT at turbine mode: A perspective of entropy production evaluation

Comparative Investigation on Hydrodynamic Performance of Pump-Jet Propulsion Designed by Direct and Inverse Design Methods

Reverse engineering of pump as turbine for CFD analysis

Contact Info

Product

Resources

About