Numerical Simulation and Analysis of Pressure Pulsation in Francis Hydraulic Turbine with Air Admission

Qian, Zhongdong; Yang, Jiandong; Huai, Wenxin

doi:10.1016/s1001-6058(07)60141-3

Cited by 91 publications

(38 citation statements)

References 2 publications

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“…The tendencies of the cavitating flow in the runner and the draft tube agree well with the empirical results for the turbine. Qian, Yang, and Huai (2007) performed 3D unsteady multiphase flow simulations for the whole Francis turbine. They focused on predicting pressure fluctuations with respect to the spiral case, the guide vane and the runner.…”

Section: Introductionmentioning

confidence: 99%

Determination and generalization of the effects of design parameters on Francis turbine runner performance

Ayli

Çelebioğlu

Aradağ

2016

Engineering Applications of Computational Fluid Mechanics

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The runner design is the most challenging part of the turbine design process. Several parameters determine the performance and cavitation characteristics of the runner: the metal angle (flow beta angle), the alpha angle, the blade beta angle, the runner inlet and outlet diameters, and the blade height. All of these geometrical parameters need to be optimized to ensure that the head, flow rate and power requirements of the system are met. A hydraulic designer has to allocate time to optimize these parameters and should be experienced in carrying out the iterative design process. In this article, the turbine runner parameters that affect the performance and cavitation characteristics of designed turbines are examined in detail. Furthermore, turbines are custom designed according to the properties of hydroelectric power plants; this makes the design process even more challenging, as the rotational speed, runner geometry, system head and flow rate vary for each turbine. The effects of the design parameters are examined for four different turbine runners specifically designed and used in actual power plants in order to obtain general results and generalizations applicable to turbine design aided by computational fluid dynamics (CFD). The flow behavior, flow angles, head losses, pressure distribution, and cavitation characteristics are computed, analyzed, and compared. To assist hydraulic designers, the general influences of these parameters on the performance of turbines are summarized and empirical formulations are derived for runner performance characterization.

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Section: Introductionmentioning

confidence: 99%

Determination and generalization of the effects of design parameters on Francis turbine runner performance

Ayli

Çelebioğlu

Aradağ

2016

Engineering Applications of Computational Fluid Mechanics

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“…About data analyze, a transfer of the data form the time domain to other domains e.g. frequency domain which has been generally emloyed for signal processing in hydrualic machinery (e.g., hydraulic turbines [35][36][37], pumps [38] and propellers [39,40]), will provide further inside for the analysis. For further enhancement of OHP, employment of hydrophobic surface is currently being intensively explored [41][42][43] due to the distinguishable characteristics of bubble dynamics on the surface [44].…”

Section: Discussionmentioning

confidence: 99%

Experimental investigations of dynamic fluid flow in oscillating heat pipe under pulse heating

Xian

Zhang

et al. 2015

Applied Thermal Engineering

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“…The realizable k−ε turbulence model is used for obtaining closure of the governing equations [11,12] …”

Section: Fig 1 3d Perspective View Of the Model Turbinementioning

confidence: 99%

Analysis of pressure oscillations in a Francis hydraulic turbine with misaligned guide vanes

Zheng

Huai

Lee

2009

Proceedings of the Institution of Mechanical Engineers, Part A:

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Three-dimensional unsteady turbulent flow in the entire flow passage of a model Francis turbine is simulated by adopting the realizable k−ε turbulence model. Using experimental data, the validity of the mathematical model is verified. Pressure oscillations are calculated for a model turbine attached with a misaligned guide vanes (MGV) device. Two MGV with five different MGV opening angles are selected for analysing the influence of MGV on pressure oscillations in the spiral case, guide vanes, runner, and draft tube. The computational results show that (a) the rotational frequency of the vortex rope remains unchanged despite different MGV openings, (b) the MGV device changes the peak-to-peak amplitude in a similar way as aligned guide vanes, (c) with increasing MGV opening, the amplitude of various frequency components in the draft tube vary in different ways, (d) a new frequency that is the product of the runner frequency and the number of MGV appears in the runner, and (e) with increasing difference between the MGV opening and the other guide vane openings, the amplitude of this new pressure oscillation increased.

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Numerical Simulation and Analysis of Pressure Pulsation in Francis Hydraulic Turbine with Air Admission

Cited by 91 publications

References 2 publications

Determination and generalization of the effects of design parameters on Francis turbine runner performance

Determination and generalization of the effects of design parameters on Francis turbine runner performance

Experimental investigations of dynamic fluid flow in oscillating heat pipe under pulse heating

Analysis of pressure oscillations in a Francis hydraulic turbine with misaligned guide vanes

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