Multistage radial flow pump - turbine for compressed air energy storage: experimental analysis and modeling

Sampedro, Egoï Ortego; Colas, Frédéric; Roussette, Olivier; Coutier-Delgosha, Olivier; Caignaert, Guy

doi:10.1016/j.apenergy.2021.116705

Cited by 14 publications

(5 citation statements)

References 14 publications

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“…Driven by the progress of modern science and technology, turbine technology has also made great progress. By studying the optimization of steam turbine running parameters and structural parameters, the steam turbine can keep running continuously in the high efficiency zone and improve system efficiency [81][82][83][84][85][86].…”

Section: Effect Of Structure and Working Parameter Optimization On Th...mentioning

confidence: 99%

A Review of the Efficiency Improvement of Hydraulic Turbines in Energy Recovery

Song

Xue

et al. 2023

Processes

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Turbine energy recovery is a process energy saving technology, and understanding turbine efficiency has important operational and economic benefits for the operator of a power plant. There are three main areas of research into turbine energy efficiency: the structural performance of the turbine itself, the configuration of the recovery device and the regulation of operating conditions. This paper summarizes recent research advances in hydraulic turbine energy efficiency improvement, focusing on the design factors that can affect the overall efficiency of a hydraulic turbine. To quantify the impact of these factors, this paper investigates the effects of surface roughness, flow rate, head and impeller speed on overall efficiency. Methods for optimizing improvements based on these design factors are reviewed, and two methods, the Box–Behnken Design method and the NSGA-II genetic algorithm, are described with practical examples to provide ideas for future research.

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Section: Effect Of Structure and Working Parameter Optimization On Th...mentioning

confidence: 99%

A Review of the Efficiency Improvement of Hydraulic Turbines in Energy Recovery

Song

Xue

et al. 2023

Processes

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“…17 Ortego Sampedro et al performed simulations of cyclic pressurization unit in the laboratory and modeled its multiphysics dynamic behavior. 18 A round-trip efficiency of 31% was achieved with the efficiency control strategy.…”

Section: Introductionmentioning

confidence: 99%

“…The study by Li et al showed that the temperature rise could be controlled to 10.59K at a pressure ratio of 1.86 17 . Ortego Sampedro et al performed simulations of cyclic pressurization unit in the laboratory and modeled its multiphysics dynamic behavior 18 . A round‐trip efficiency of 31% was achieved with the efficiency control strategy.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic investigation of variable‐speed compression unit in near‐isothermal compressed air energy storage

Wang

Sun

et al. 2023

Energy Storage

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Isothermal compression is the state‐of‐the‐art in compressed air energy storage (CAES) technology. The study of cyclic pressurization unit in isothermal CAES is carried out in this paper. The unit can continuously compress air utilizing double vessels operating alternately. In each vessel, the large heat capacity of water and spray cooling is applied to establish a conducive environment for the air achieving the effect of efficient near‐isothermal compression. The operating mode of the cyclic pressurization unit is divided into sliding‐pressure operation and constant‐pressure operation according to the pressure of its outlet. By adopting the characteristic curves of pump, the dynamic model is built for the unit in this paper. Further, the differences between the cyclic pressurization unit in isentropic process and in variable‐speed process are quantified and compared in four different cases. In isentropic process, the energy‐saving ratio and exergy efficiency of the unit are expected to reach 20.4% and 95.0%, respectively. In variable‐speed process, the energy‐saving ratio and efficiency of the unit can achieve 7.3% and 73.4%, respectively. This gap is mainly determined by the off‐design performance of the pump. Moreover, the vessel volume should be no less than 3 m3 and 5 m3 when there is spraying and when there is no spraying. Furthermore, spraying favors the improvement of the worsened compression performance caused by the change of design parameters. The energy‐saving ratio can be improved via spraying by 1.3% to 11.0% and 1.8% to 25.6% in the isentropic and variable‐speed processes, respectively. Meanwhile, the exergy efficiency can be increased by 1.5% to 9.4% in the isentropic process and 1.4% to 8.4% in the variable‐speed by spraying.

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“…It is found that the main feedwater pump often vibrates severely when running under a part load condition, and even if it is shut down for maintenance, the problem could not be solved fundamentally, leaving a large safety hazard to the system [1]. Besides, severe unsteady characteristics under a part load condition may interrupt the pump start, the pump stop, and condition transformation [2,3]. The head curve hump under a part load condition is always an important cause of the above problems.…”

Section: Introductionmentioning

confidence: 99%

RANS CFD Analysis of Hump Formation Mechanism in Double-Suction Centrifugal Pump under Part Load Condition

et al. 2021

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The RANS (Reynolds-averaged Navier–Stokes equations) with CFD (Computational Fluid Dynamics) simulation method is used to analyze the head hump formation mechanism in the double-suction centrifugal pump under a part load condition. The purpose is to establish a clear connection between the head hump and the microcosmic flow field structure, and reveal the influence mechanism between them. It is found that the diffuser stall causes a change in the impeller capacity for work, and this is the most critical reason for hump formation. The change in the hydraulic loss of volute is also a reason for hump, and it is analyzed using the energy balance equation. The hump formation mechanism has not been fully revealed so far. This paper found the most critical flow structure inducing hump and revealed its inducing mechanism, and greatly promoted the understanding of hump formation. The impeller capacity for work is analyzed using torque and rotational speed directly, avoiding large error caused by the Euler head formula, greatly enhancing the accuracy of establishing the connection between the impeller capacity for work and the coherent structure in the flow field under a part load condition. When a pump is running in the hump area, a strong vibration and noise are prone to occur, endangering the pump safety and reliability, and even the pump start and the transition of different working conditions may be interrupted. Revealing the hump formation mechanism provides a key theoretical basis for suppressing hump. Hump problems are widespread in many kinds of pumps, causing a series of troubles and hazards. The analysis method in this paper also provides a reference for other pumps.

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Multistage radial flow pump - turbine for compressed air energy storage: experimental analysis and modeling

Cited by 14 publications

References 14 publications

A Review of the Efficiency Improvement of Hydraulic Turbines in Energy Recovery

A Review of the Efficiency Improvement of Hydraulic Turbines in Energy Recovery

Thermodynamic investigation of variable‐speed compression unit in near‐isothermal compressed air energy storage

RANS CFD Analysis of Hump Formation Mechanism in Double-Suction Centrifugal Pump under Part Load Condition

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