Optimization of the Trailing Edge Inclination of Wet Steam Turbine Stator Blade Towards the Losses Reduction

Hoseinzade, Davood; Lakzian, Esmail; Dykas, Sławomir

doi:10.1007/s40799-021-00534-5

Cited by 5 publications

(1 citation statement)

References 36 publications

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“…Meanwhile, El-Gendi et al [15] used delayed detached eddy simulations to investigate the relationship between energy losses and the transformation of turbine machinery from a circular to an elliptical trailing edge with varying aspect ratios. Hoseinzade et al [16] optimized the local entropy integral and other objectives by altering the trailing edge angle of steam turbine blades, studying the impact of this angle on thermodynamic losses. They also examined the influence of the trailing edge thickness on the energy characteristics, such as blade profile losses and aerodynamic losses in the compressor [17].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Trailing Edge Shape of Impeller Blades on Centrifugal Pumps with Unsteady Characteristics

Song,

Chen,

et al. 2024

Processes

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The flow field structure and pressure pulsation characteristics in two series of trailing edges of a centrifugal pump are investigated using the SST k-w turbulence model. Series 1 involves varying the impeller exit angle, and Series 2 involves varying the impeller exit shape. The entropy generation rate analysis method is used to evaluate the numerical simulation results. Vortex cores within the flow field are identified by applying the Ω criterion. The influence of different trailing edge configurations on the energy loss characteristics of the pumps is explored. The dynamic mode decomposition (DMD) method is used to analyze pressure pulsations at the volute considering unsteady flows in centrifugal pumps with different trailing edge shapes. The findings suggest that different trailing edge shapes can be used to adjust the energy loss proportions in various components of the pump. In Series 1, the efficiency remains nearly constant with changes in the outlet angle on both sides of the trailing edge. In Series 2, the efficiency is enhanced by 1.18% with the elliptical edge shape on both sides (EBS) compared to the original trailing edge (OTE) shape. In Series 1 and Series 2, greater entropy generation rates are accompanied by greater pressure pulsations at the pump outlet. The DMD results demonstrate a noticeable impact of the different trailing edges on the pressure distribution of various modes within the volute. Moreover, the impeller outlet pressure inhomogeneity coefficient changes under different modes. This study holds great significance for selecting the appropriate trailing edges for centrifugal pumps.

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Section: Introductionmentioning

confidence: 99%