Numerical investigation of wet inflow in steam turbine cascades using NURBS-based mesh generation method

Ebrahimi-Fizik, Amir; Lakzian, Esmail; Hashemian, Ali

doi:10.1016/j.icheatmasstransfer.2020.104812

Cited by 30 publications

(6 citation statements)

References 61 publications

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“…Han et al [23] proposed a two-fluid condensing flow modelling to clarify the influences of the surface heating on blade performances and their numerical investigation showed that the surface heating could restrain the nonequilibrium condensations in the steam turbines. Ebrahimi-Fizik et al [24] used the non-uniform rational B-splines mesh generation methods to investigate the wet steam flows in a steam turbine and they reported that the prediction of pressure and droplet radius could be improved by 35.64% and 78.44%, respectively. Cao et al [25] investigated the condensed droplet distribution in a three-dimensional steam turbine, and they found that the vortexes could influence the locations, numbers and sizes of the condensed droplets in the steam turbine.…”

Section: Introductionmentioning

confidence: 99%

Wet steam flow and condensation loss in turbine blade cascades

Wen

Yang

Ding

et al. 2021

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 99%

Wet steam flow and condensation loss in turbine blade cascades

Wen

Yang

Ding

et al. 2021

Applied Thermal Engineering

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“…where denotes liquid mass fraction. Some basic assumptions for modeling wet steam as following [31]:…”

Section: Governing Equationsmentioning

confidence: 99%

Numerical investigation of roughness effect on wet steam ejector performance in the refrigeration cycle

2022

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Machining operation and presence of water droplet cause increasing the surface roughness of wet steam ejector walls and changing its performance in the refrigeration cycle. The purpose of this work is to investigate the influences of the primary nozzle surface roughness on wet steam ejectors in the refrigeration cycle with steam water as a working flow. The flow is modeled by solving governed equations based on the Eulerian-Eulerian approach. The proposed model is validated by comparison numerical results with experimental data of the ejector and nozzle. Moreover, different surface roughness has been successfully applied to the primary nozzle and its effect on the entire flow is shown. Six properties of wet steam are selected, including pressure, temperature, Mach number, droplet average radius, droplet growth rate, and liquid mass fraction. The result shows, increase in the surface roughness resulted in a shift of the shock chain to the primary nozzle, damping shock strength, and increasing temperature in the diffuser. In addition, increment of the primary nozzle surface roughness decreases ER and COP of the refrigeration cycle by 3.67% and 3.8%, respectively. According to the important impact of the roughness on the liquid mass fraction, droplet average radius, droplet growth rate, ER, and COP, designers and operators should be considered the roughness effects in the design and operation of wet steam ejectors.

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“…Based on their results, there is an optimal volumetric heating that minimizes the wetness and, hence, the economic cost. Other investigated factors in reducing the thermodynamic loss of steam turbines are, e.g., the surface roughness of blades [21], employing different divergence angle [22], droplet spraying [23], different rates of expansion and injection of water droplets [24], and existence of wetness at inlet [25].…”

Section: Nomenclaturementioning

confidence: 99%