Increasing the efficiency of highly concentrated coal-water fuel based on the simulation of non-Newtonian fluid flow

Chernetskaya-Beletskaya, N; Rogovyi, Andrii; Baranov, I. Ya.; Krut, Alexander; Miroshnikova, Maria; Bragin, N

doi:10.1051/matecconf/201929401009

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…Адекватність отриманих результатів перевірялася на якісному рівні порівнянням картин течії з картинами течії в експерименті. Верифікація програмного комплексу для розрахунків вихорокамерного насоса проведена на ньютонівській рідині в роботі [12], неньютонівській (бінгамівській) рідини за умови течії в трубі -у роботі [32].…”

Section: рис 1 розрахункова схема вихорокамерного насосаunclassified

Flow fields of a non-Newtonian fluid in vortex chamber pumps

Rogovyi¹,

Neskorozhenyi²

2021

Bulletin of KhNAHU

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Problem. Pumping different fluids by hydraulic transport is associated with fast wear of the pump contact surfaces. The fluids being pumped are often non-Newtonian. The use of jet pumps for pumping is impractical due to low efficiency. Vortex chamber pumps may have higher efficiency when pumping non-Newtonian fluids, however, their operation on such fluids has not yet been studied. The aim of this work is to study the characteristics of the flow fields of a non-Newtonian fluid using the example of a Bingham fluid in the vortex chamber pump. Methodology. Predicting pump energy performance and determining flow fields for highly viscous fluids using CFD simulations enables advanced jet pumps to handle non-Newtonian fluids. Results. Modeling was carried out based on the numerical solution of the RANS equations with the SST turbulence model. To ensure the operability of the vortex chamber pump when pumping non-Newtonian fluid, with known rheological parameters of the mixture, it is necessary to select the required supply pressure for the active flow, and also to consider the issue of diluting the liquid with water to reduce the mixture viscosity and achieve the specified values of the pumping energy parameters. Originality. The hypothesis that the vortex chamber supercharger can operate on a hypothetical ideal fluid has been confirmed. In this case, the performance indicators of such a supercharger improve and tend to ideal. With an increase in plastic viscosity, the volumetric flow rate of the pumped fluid decreases, and at high values of the viscosity, an active flow is ejected through the axial channels. Practical value. Researchers can use the theoretical results of this work to design new devices for pumping other Bingham fluids, such as oil paint, resins, varnishes, swamp soils, and many others.

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Section: рис 1 розрахункова схема вихорокамерного насосаunclassified

Flow fields of a non-Newtonian fluid in vortex chamber pumps

Rogovyi¹,

Neskorozhenyi²

2021

Bulletin of KhNAHU

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“…Цю систему рівнянь можна розв'язати для всієї області. В інерціальній системі відліку рівняння можна перетворити до оригінального вигляду, задавши кутову швидкість 0 Ω = [21]. В роботі для замикання рівнянь математичної моделі використано дві найбільш вживаних для подібних задач моделі турбулентності [22]: k-ε модель [23] та k-ω SST-модель [24].…”

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Validation of the Hydraulic Turbine Openfoam Library for a High-Pressure Centrifugal Compressor

Rogovyi,

Azarov,

Shudryk

et al. 2024

HM and HU

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A special program module was added to OpenFoam more than 10 years ago, and a large number of studies have been devoted to its use for solving turbine engineering problems. Modeling inaccuracies can occur when the velocity is increased to supersonic flow. The aim of this work is to validate the OpenFoam open library of hydraulic turbines for the a high-pressure centrifugal compressor flow calculation and finding the parameters and calculation model that are optimal in terms of efficiency and total/total pressure ratio. For the numerical calculation, we used Reynolds averaging of the Navier-Stokes equations, which are used in the CFD library OpenFoam v. 2212. In this work, the two most commonly used turbulence models for such problems are used to close the equations of the mathematical model: the k-e model and the Shear stress transport (SST) model. The simulation was performed using a modified version of the sonicFoam solver, which is available in OpenFoam. The maximum error in calculating the total pressure ratio in the working zone for all models was 3 %. All models behave poorly in the low mass flow rate zone. The slope of all curves corresponds to the experimental characteristic. The calculation using the models with very fine meshes on average determines a 2 % increase in the total-to-total pressure ratio. Using OpenFoam, the integrated parameters of a high-pressure centrifugal compressor can be predicted accurately (maximum error does not exceed 5 %). The most accurate efficiency is predicted by the SST model using meshes of more than 2.56 million elements, but this number of elements is not enough to predict the compressor's performance at low flow rate zone. In further research, it is rational to use grids consisting of at least 5 million elements and use the SST turbulence model.

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Increasing the efficiency of highly concentrated coal-water fuel based on the simulation of non-Newtonian fluid flow

Cited by 2 publications

References 19 publications

Flow fields of a non-Newtonian fluid in vortex chamber pumps

Flow fields of a non-Newtonian fluid in vortex chamber pumps

Validation of the Hydraulic Turbine Openfoam Library for a High-Pressure Centrifugal Compressor

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