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Effect of superheating the inlet steam on the steam-liquid two-phase flow in the Bakhtar steam turbine blade
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Saeed Mahmoodi1   , Mohamad Hamed Hekmat *2 , Ebrahim Sharifi Tashnizi1 , Haniye Mosafer3 |
1- Department of Mechanical Engineering, Tafresh University, Tafresh 39518-79611, Iran
2- Department of Mechanical Engineering, Tafresh University, Tafresh 39518-79611, Iran , hekmat@tafreshu.ac.ir
3- Department of Mechanical Engineering, University of Jahrom, Jahrom, Iran |
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Abstract: (49 Views) |
In the power plant industry, part of the energy loss in the thermodynamic cycle is due to the fact that steam turbines are not made to work with wet steam flow and the presence of liquid phase causes a decrease in efficiency and mechanical damage. The main objective of this study is a complete evaluation of the effect of increasing the inlet steam temperature on the supersonic flow pattern in the steam turbine blade. Accordingly, the low-pressure section of Bakhtar turbine is simulated in two dimensions to examine the superheated steam degree. Steady compressible flow is analyzed using an implicit density-based approach and a finite volume method based on an Eulerian-Eulerian framework. The turbulence model employed is the k-ω SST model. For modeling the condensation flow of wet steam, the Kontorovitz nucleation model and Young's droplet growth model are utilized. The results indicate that increasing the inlet temperature significantly affects condensation flow parameters, reducing condensation losses. Specifically, with a 30-degree increase in blade inlet temperature, the average liquid mass fraction, condensation losses, and average droplet radius at the outlet decrease by 56.65%, 56.38%, and 48%, respectively, compared to the initial state. Additionally, increasing the inlet temperature leads to a reduction in the mass flow rate entering the blade. |
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| Keywords: steam turbine blade, non-equilibrium condensation, droplet radius, condensation losses, turbine inlet temperature |
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Full-Text [PDF 1471 kb]
(18 Downloads)
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Type of Study: Research |
Subject:
Thermodynamics
Received: 2025/04/21 | Accepted: 2025/07/27 | Published: 2025/09/1
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