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Entropy Generation and Exergy Destruction in Condensing Steam Flow Through Turbine Blade with Surface Roughness by Hongbing Ding; Yiming Li; Esmail Lakzian; Chuang Wen; Chao Wang is a Engineering article available to read on EtoBox.

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In the steam turbine, the wetness loss due to vapor condensation is one of the most crucial losses at low-pressure stage. This study focused on entropy generation and exergy destruction of condensing steam flow in turbine blade with the roughness. The governing equations including entropy transport equation combined with condensation model, transition SST model and roughness correlation were established and verified by experiments and theory. Flow field behaviors, such as wetness fraction, intermittency and turbulent viscosity distributions, controlled by the deviation angle were obtained to evaluate effects of back pressure ratio and surface roughness. The mass-averaged wetness fraction at outlet was also extracted considering the influence of uneven mass flux. Finally, each part of entropy generation derived from viscous, heat conduction, phase change and aerodynamic losses and exergy destruction ratio were analyzed. Research shows that roughness plays an important part in the intermittency and turbulent viscosity. The mass-averaged wetness fraction at outlet sharply drops with back pressure ratio but slightly decreases with the roughness. With the roughness rising or back pressu

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Author

Hongbing Ding; Yiming Li; Esmail Lakzian; Chuang Wen; Chao Wang

Publisher

Elsevier BV

Published

2019

Language

EN

Field

Engineering (Physical Sciences)