Numerical Simulation of the Impact of Unit Commitment Optimization and Divergence Angle on the Flow Pattern of Forebay

Xu, Cundong; Zhang, Hongyang; Zhang, Xianqi; Han, Liwei; Wang, Rongrong; Wen, Qinyu; Ding, Lianying

doi:10.18280/ijht.330215

Cited by 5 publications

(3 citation statements)

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“…Its main function is to guide water flow smoothly into the intake basin of the pumping station and ensure good intake conditions of the pump [3]. The flow pattern of the pumping station forebay directly affects the hydraulic performance, operating efficiency, and service life of the pumping station, and even affects the normal operation of the pumping station [4,5]. However, with global warming, the frequency of extreme weather events is increasing, and flooding disasters are showing a more frequent trend, which puts more pressure on some older pumping stations, especially on the flow pattern of the forebay at high water level.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigations of Flow Pattern and Anti-Vortex Measures of Forebay in a Multi-Unit Pumping Station

Yang

Zhang

Liu

et al. 2021

Water

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The forebay of a pumping station is an important building connecting the diversion channel and the intake pool. Based on the physical model test and research method of computational fluid dynamics (CFD) based on the improved fluid volume model, the flow field in a forebay of a multi-unit pumping station is analyzed in combination with the engineering practice of the Exi River flood discharge station in the Anhui Province, China. Aiming at the technical problems of a large-scale swing water area in the forebay internal flow field of a lateral intake pumping station, the technical problems are discussed. Different rectification measures are selected to adjust the flow pattern in the forebay of a pumping station. The internal rectification flow pattern in the forebay under different plans, the uniformity of flow velocity distribution in the measurement section, and the reduction rate of the vortex area are studied and compared, and the optimal plan is given. The results show that the flow pattern of the 7.5 m and 15 m solutions of the lengthened inflow wall is still poor, and the ability to eliminate vortices is not strong or even counterproductive. The combination plan of a rectifier sill and a rectifier pier has a better effect and can eliminate more than 90% of the vortex, but the uniformity of flow speed has not been significantly improved at the inlet of the pumping station; the combination plan of a rectifier sill and a diversion wall opening has the best effect; the reduction rate of the vortex area is more than 85%, and the velocity uniformity of three measuring sections is better than that of the original plan. The uniformity of flow rate near the pumping station is increased by 4% and that far away from the pumping station is increased by 13%. The combination plan of a rectifier sill and diversion wall with openings is recommended.

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Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigations of Flow Pattern and Anti-Vortex Measures of Forebay in a Multi-Unit Pumping Station

Yang

Zhang

Liu

et al. 2021

Water

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“…To precisely predict the critical speed of the pump rotor, in this paper, an improved fluid-structure interaction dealing method is applied to the finite element model. With this model, the effects of the fluid on critical speeds of the pump rotor is further numerically discussed [14,15].…”

Section: Introductionmentioning

confidence: 99%

Study on critical speed of rotation in the multistage high speed centrifugal pumps rotors

Tian¹,

Hu²

2018

IJHT

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Apart from hydraulic performance, the critical rotate speed in wet operating condition (the liquid lubricant state) is an important parameter in the designing of the multistage high speed centrifugal pumps rotors. In this paper, the finite element dynamic model of the rotor in dry state (without lubricate) is analysed by the lubricant fluid applied to the disk and cylinder parts, and a resistance equation of the influence of the fluid is proposed based on the analysis. This resistance is then coupled into the dry state finite element dynamic model to obtain that of the wet state, which is considered as the fluid-solid coupled interaction. With this model, the study further studies the influence of several factors on the inherent frequency of the rotor, and simulates the bending and torsion formation of the physical model. Simulation results show that, when the fluid's influence is considered, the inherent frequency of the rotor is very different from that of the dry state, and hence this influence cannot be neglected in the designing of the rotor. These results are also verified by corresponding experiments.

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“…With the development of computer hardware and algorithms [7,8], the CFD method can play a much more important role in the design of a sting with low interference. However, most of the research is devoted to the assessment of sting interference rather than to the optimal design of the sting.…”

Section: Introductionmentioning

confidence: 99%

The Optimal Design of a Wind Tunnel Model Sting System Based on the CFD Method

Li¹,

Liu²,

Li³

2015

IJHT

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This paper aims to design a sting support system for a transonic wind tunnel test for a commercial wide-bodied aircraft, which includes a single sting and a blade support. Parameters of the sting support system have been analyzed and three key parameters are selected for optimization. A RANS solver has been developed to investigate the effects of key parameters on the sting support interference. Influences of four incidence angles and five locations of an expanding point on the single sting interference are studied, and also the effects of six vane leading edge sweep angles on the blade support interference are investigated. The optimal key parameters are determined, based on numerical results and structural rigidity. Structural intensity verification of the optimized support system has been performed under the estimated aerodynamic loading by commercial software. Results indicate that a 6° incidence angle and 03 expanding point are the optimal parameters for a single sting and a 50° leading edge sweep angle of the vane is optimal for blade support. The optimized sting system with sufficient safety factors is suitable for commercial wide-bodied aircraft wind tunnel tests, which implies the method in this paper can be used to optimize the sting support system of other vehicles.

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Numerical Simulation of the Impact of Unit Commitment Optimization and Divergence Angle on the Flow Pattern of Forebay

Cited by 5 publications

References 0 publications

Numerical and Experimental Investigations of Flow Pattern and Anti-Vortex Measures of Forebay in a Multi-Unit Pumping Station

Numerical and Experimental Investigations of Flow Pattern and Anti-Vortex Measures of Forebay in a Multi-Unit Pumping Station

Study on critical speed of rotation in the multistage high speed centrifugal pumps rotors

The Optimal Design of a Wind Tunnel Model Sting System Based on the CFD Method

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