Three‐dimensional vortex simulation of unsteady flow in hydraulic turbines

Zhu, Baoshan; Wang, Hong; Wang, Longbu; Cao, Shuai

doi:10.1002/fld.3869

Cited by 3 publications

(2 citation statements)

References 32 publications

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“…The pressure variation as in (11) can be adequate compared with the parabola aspect of the vortices obtained by other researchers, using numerical methods, as in [5,6,7].…”

Section: Fig3 the Parameters Of The Depression Zonementioning

confidence: 98%

The Study of the Depression Occurred under Different Types of Impellers

Mândrea

Oprina

Babutanu

et al. 2016

AMM

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The paper presents the analytical solution used to calculate the depression which appears under different types of impellers. This solution can be useful as a preliminary calculus to estimate the magnitude of the depression created at different rotational speeds, in order not to damage the equipment from different systems, such as hydraulic turbines. The authors obtain the variable radius of the depression zone, the pressure inside the depression zone and the depression height. The theoretical approach, the calculus itself and the numerical results presented in the article are original. In order to validate the proposed calculus, experiments were carried out using two experimental setups. The performed measurements showed a good agreement of the experimental and theoretical results.

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“…The pressure variation as in (11) can be adequate compared with the parabola aspect of the vortices obtained by other researchers, using numerical methods, as in [5,6,7].…”

Section: Fig3 the Parameters Of The Depression Zonementioning

confidence: 98%

The Study of the Depression Occurred under Different Types of Impellers

Mândrea

Oprina

Babutanu

et al. 2016

AMM

View full text Add to dashboard Cite

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“…The velocity components are characterized by making use of a fundamental solution procedure, namely the Biot-Savart law [13][14][15]. (2) The Cauchy-Riemann approach.…”

Section: Introductionmentioning

confidence: 99%

MC-Smooth: A mass-conserving, smooth vorticity–velocity formulation for multi-dimensional flows

Cao

Bennett

Smooke

2015

Combustion Theory and Modelling

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A novel vorticity-velocity formulation of the Navier-Stokes equations -the MassConserving, Smooth (MC-Smooth) vorticity-velocity formulation -is developed in this work. The governing equations of the MC-Smooth formulation include a new secondorder Poisson-like elliptic velocity equation, along with the vorticity transport equation, the energy conservation equation, and N spec species mass balance equations. In this study, the MC-Smooth formulation is compared to two pre-existing vorticity-velocity formulations by applying each formulation to confined and unconfined axisymmetric laminar diffusion flame problems. For both applications, very good to excellent agreement for the simulation results of the three formulations has been obtained. The MC-Smooth formulation requires the least CPU time and can overcome the limitations of the other two pre-existing vorticity-velocity formulations by ensuring mass conservation and solution smoothness over a broader range of flow conditions. In addition to these benefits, other important features of the MC-Smooth formulation include: (1) it does not require the use of a staggered grid, and (2) it does not require excessive grid refinement to ensure mass conservation. The MC-Smooth formulation is a computationally attractive approach that can effectively extend the applicability of the vorticity-velocity formulation.

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Transient phenomena in the draft tube model of a Francis hydro-turbine

Суслов

Litvinov

Gorelikov

et al. 2019

J. Phys.: Conf. Ser.

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This article is devoted to the study of pressure pulsations behind the runner of a hydro turbine model caused by the precessing vortex core (PVC). Pressure pulsations are investigated under conditions of stationary load and transient modes of the hydro-turbine operation. Studies were performed in model conditions on the aerodynamic setup. The map of pressure pulsations was built for stationary modes using acoustic sensors and served to find rotational speeds of the swirler and flow rates at which the PVC occurs. On the basis of the data presented by parametric dependences, the initial and final parameters of the transition process were chosen. In the article, a sudden (fast) transition from part-load regime to the best efficiency point and back was considered. The characteristic times for the formation of PVC and the establishment of the flow regime when changing the controlling parameters of the installation have been determined using a continuous wavelet transform.

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Three‐dimensional vortex simulation of unsteady flow in hydraulic turbines

Cited by 3 publications

References 32 publications

The Study of the Depression Occurred under Different Types of Impellers

The Study of the Depression Occurred under Different Types of Impellers

MC-Smooth: A mass-conserving, smooth vorticity–velocity formulation for multi-dimensional flows

Transient phenomena in the draft tube model of a Francis hydro-turbine

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