Numerical and experimental investigations on inflow loss in the energy recovery turbines with back-curved and front-curved impeller based on the entropy generation theory

Qi, Bing; Stankovic, John A.; Geng, Lei; Zhao, Ruijie; Esch, B.P.M. van

doi:10.1016/j.energy.2021.122426

Cited by 21 publications

(2 citation statements)

References 36 publications

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“…To elucidate the optimization mechanism, the energy loss of the optimized model was comparatively analyzed with that of the original model using entropy production theory. Similarly, only a brief introduction to the main computational equations of entropy production theory was given here; for more details, please refer to the original literature (Kock and Herwing, 2004;Qi et al, 2022).…”

Section: Item Factorsmentioning

confidence: 99%

Mixed-flow pump performance improvement based on circulation method

et al. 2023

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Mixed-flow pumps have been extensively employed in daily life, improving their energy characteristics contribute to the reduction of energy consumption worldwide. In this study, to overcome the decrease of optimization upper limit caused by using a single type of parameter as the design parameter, a typical mixed-flow pump was chosen for study, and its impeller was parameterized by five geometric and eight hydrodynamic parameters. With head and efficiency as the constraint and optimization objective respectively, 27 schemes were constructed by the Taguchi method. The influence of design factors to the objective and constraint was analyzed based on range and regression analysis. The optimization mechanism was elucidated using the entropy production method. The result reveals that the geometric and hydrodynamic parameters have a significantly impact on the mixed-flow pump’s energy characteristics. The optimized model head is 12.43m, which meets the constraints, while the efficiency increases by 3.2%–88.51%. Therefore, considering both geometric and hydrodynamic parameters in the mixed-flow pump optimization is workable and necessary. This paper can provide practical instructions on the optimal design of different turbomachines.

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Section: Item Factorsmentioning

confidence: 99%

Mixed-flow pump performance improvement based on circulation method

et al. 2023

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“…Binama et al [9] that the pressure pulsations within the PAT were mainly influenced by the RSI r. Wang et al [10] found that axial vortices within the PAT are also another important cause of pressure pulsation. Qi et al [11] found that the vortex formed by the flow diversion is the main sesource for the energy loss of impeller.…”

Section: Introductionmentioning

confidence: 99%

Study on the energy conversion characteristics in the impeller of ultra-low specific speed pump as turbine

He,

Si,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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With the increasing attention to micro-hydropower generation, pump as turbine (PAT) has broad prospects in the field of micro-hydropower generation due to low price and easy maintenance. The ultra-low specific speed has the advantage of large output power under a small flow rate and is widely used in remote areas to realize micro-hydropower generation. In this paper, With the goal of maximizing the output power at a small flow rate, an ultra-low specific speed pump as turbine (USSPAT) of 16.52 is designed. The energy characteristics inside the impeller are studied by means of experimental and simulation. It is found that the main output area in the impeller located in the inlet area of impeller and near Span0.6 area. In addition, it is found that the high-speed jet caused by RSI inside the impeller and the secondary circulation at the outlet area are the main flow structures that hinder the work of the impeller.

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