Optimisation study of a supersonic separator considering nonequilibrium condensation behaviour

Wen, Chuang; Ding, Hongbing; Yang, Yan

doi:10.1016/j.enconman.2020.113210

Cited by 59 publications

(7 citation statements)

References 43 publications

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“…For the modelling implementation, the two scalar equations ( 4) and ( 5), and source terms in equations ( 6) -( 17) are interpreted by the C programming [41,42] and are integrated into ANSYS FLUENT 18. The density-based approach is employed to solve the wet steam flow in steam turbines, and the second-order upwind discretization is used for the flow, turbulence and droplet number and liquid fraction equations.…”

Section: Numerical Implementationmentioning

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: Numerical Implementationmentioning

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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“…Furthermore, to further investigate the accuracy of the developed CFD model, the root mean square ( R 2 ) was used, which is defined by Eq. (40) 48 , 49 . Figure 5 shows the results of comparison between numerical results and experimental data.…”

Section: Resultsmentioning

confidence: 99%

A novel strategy for comprehensive optimization of structural and operational parameters in a supersonic separator using computational fluid dynamics modeling

Shoghl

Naderifar

Farhadi

et al. 2021

Sci Rep

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In this study, the effects of several structural and operational parameters affecting the separation efficiency of supersonic separators were investigated by numerical methods. Different turbulence models were used and their accuracies were evaluated. Based on the error analysis, the V2-f turbulence model was more accurate for describing the high swirling turbulent flow than other investigated turbulence models. Therefore, the V2-f turbulence model and particle tracing model were selected to optimize the structure of the convergence part, the diffuser, the drainage port, and the swirler. The cooling performance of three line-type in the convergent section were calculated. The simulation results demonstrated that the convergent section designed by the Witoszynski curve had higher cooling depth compared to the Bi-cubic and Quintic curves. Furthermore, the expansion angle of 2° resulted in the highest stability of fluid flow and therefore was selected in the design of the diffuser. The effect of incorporating the swirler and its structure on the separation performance of supersonic separator was also studied. Three different swirler types, including axial, wall-mounted, and helical, were investigated. It was observed that installing the swirler significantly improved the separation efficiency of the supersonic separator. In addition, the simulation results demonstrated that the separation efficiency was higher for the axial swirler compared to the wall-mounted and helical swirlers. Therefore, for the improved nozzle, the swirling flow was generated by the axial swirler. The optimized axial swirler was constructed from 12 arced vanes each of which had a swirl angle of 40°. For the optimized structure, the effects of operating parameters such as inlet temperature, pressure recovery ratio, density, and droplet size was also investigated. It was concluded that increasing the droplet size and density significantly improved the separation efficiency of the supersonic separator. For hydrocarbon droplets, the separation efficiency improved from 4.6 to 76.7% upon increasing the droplet size from 0.1 to 2 µm.

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“…In the present study, the two-dimensional (2D) simulation is carried out based on the wet steam two-phase flow model [ 28 , 29 ]. The phase change is determined by the nonequilibrium condensation behaviour due to the high expansion process of the steam in the transonic flows [ 30 , 31 ].…”

Section: Numerical Modelmentioning

confidence: 99%

A Novel Dehumidification Strategy to Reduce Liquid Fraction and Condensation Loss in Steam Turbines

Yang

Peng

Wen

2021

Entropy

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Massive droplets can be generated to form two-phase flow in steam turbines, leading to erosion issues to the blades and reduces the reliability of the components. A condensing two-phase flow model was developed to assess the flow structure and loss considering the nonequilibrium condensation phenomenon due to the high expansion behaviour in the transonic flow in linear blade cascades. A novel dehumidification strategy was proposed by introducing turbulent disturbances on the suction side. The results show that the Wilson point of the nonequilibrium condensation process was delayed by increasing the inlet superheated level at the entrance of the blade cascade. With an increase in the inlet superheated level of 25 K, the liquid fraction and condensation loss significantly reduced by 79% and 73%, respectively. The newly designed turbine blades not only remarkably kept the liquid phase region away from the blade walls but also significantly reduced 28.1% averaged liquid fraction and 47.5% condensation loss compared to the original geometry. The results provide an insight to understand the formation and evaporation of the condensed droplets inside steam turbines.

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Optimisation study of a supersonic separator considering nonequilibrium condensation behaviour

Cited by 59 publications

References 43 publications

Wet steam flow and condensation loss in turbine blade cascades

Wet steam flow and condensation loss in turbine blade cascades

A novel strategy for comprehensive optimization of structural and operational parameters in a supersonic separator using computational fluid dynamics modeling

A Novel Dehumidification Strategy to Reduce Liquid Fraction and Condensation Loss in Steam Turbines

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