Influence of stage design parameters on ventilation power produced by steam turbine last stage blades during low load operation

Mambro, Antonio; Congiu, Francesco; Galloni, Enzo

doi:10.1016/j.tsep.2021.101054

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…One of the most convenient quantities for the flow field assessment is dimensionless velocity, that is, Mach number (Ma), expressed in equation (22).…”

Section: Stage Velocitiesmentioning

confidence: 99%

“…White 21 presented thermodynamic system optimization for fluids in which the reaction ratio applied to distinction among the stator and rotor expansion process. The effect of the degree of reaction was studied as design criterion for ventilation power at a lowpressure steam turbine by Mambro et al 22 Different outlet pressures have a significant effect on nucleation rate and liquid mass fraction in the steam turbine. By investigating entropy generation and exergy destruction in steam flow through the steam turbine blade, Ding et al 23 showed that increasing roughness or decreasing back pressure caused entropy to grow, leading to more exergy destruction.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancing low-pressure stage steam turbine using the TDLD criterion and the TOPSIS analysis

Dolatabadi,

Lakzian,

Masoumi

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The liquid phase in the wet steam flow causes thermodynamics losses and affects steam turbine blade durability. The main objective of the present research is the design of the rotor stagger angle and different operating conditions in the low-pressure stage of the steam turbine. A two-phase Eulerian-Eulerian model and the SST k − ω model are used to simulate the viscous wet steam flow inside the steam turbine stage. Frozen rotor methodology is employed for modeling the stator-rotor interaction. The effects of different rotor stagger angles and different outlet pressure levels on the wet steam flow parameters are studied to introduce an improved case. The turbine stage efficiency, droplet average radius, liquid mass fraction, and degree of reaction (TDLD) are considered as design criteria. The search for the improved value of pressure ratio and rotor stagger angle is performed using the TDLD criterion by TOPSIS (Technique for Order of Preference by Similarity to Ideal Solution). The improved case is selected with a rotor stagger angle of 64 degrees and outlet pressure of 6.5 kPa, at which the turbine stage efficiency (TSE) is increased by 21.3% compared to [Formula: see text]. Also, the liquid mass fraction (LMF) and the degree of reaction (DOR) reduced by 39.53 and 26% relative to [Formula: see text], and [Formula: see text], respectively. In addition, droplet average radius (DAR) increases by 26.14% compared to [Formula: see text].

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“…One of the most convenient quantities for the flow field assessment is dimensionless velocity, that is, Mach number (Ma), expressed in equation (22).…”

Section: Stage Velocitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhancing low-pressure stage steam turbine using the TDLD criterion and the TOPSIS analysis

Dolatabadi,

Lakzian,

Masoumi

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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show abstract

“…[1][2][3]. For turbine designers it is important to define well the output, and for low volume conditions even the input of last stages [4][5][6] using numerical or sometimes even experimental methods. In recent articles [7,8] aerodynamic instability of the flow has been discussed in the turbine last stages.…”

Section: Introductionmentioning

confidence: 99%

Flow and Vibration in the Small Steam Turbine Last Stage

2022

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The paper deals with evaluation of experimental data obtained from the real-size 30 MW output Waste to Energy steam turbine. For many turbine regimes pressures in the last stage area were obtained. At the same time amplitudes of blade tips vibrations were measured of last rotor blades using the blade tip timing system and axial velocity of the steam at the last stage outlet. The obtained data are mutually correlated and relations are analysed between increased vibration values and pressure ratios at the last stage. Increased tip vibrations occur mainly in the area when the pressure ratio over the last blade tip and root is higher than one. In this case there is no expansion, but compression in the last stage of the turbine. The presented results contribute to understanding of processes in the last stage of the steam turbine, mainly for those regimes of turbine operation when its output is lower than 20 % of the nominal output, e.g. during the island regime.

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“…Besides, a vortex could also be seen in the clearance between the rotor and stator cascade. Mambro et al 18 found that there were three recirculating regions in rotor blade passage during low load steam turbine operation, and these regions were affected by stage design parameters like degree of reaction.…”

Section: Introductionmentioning

confidence: 99%

Flow characteristics of last‐segment axial turbine adopted in compressed air energy storage system under low load and windage conditions

Huang

Zhu

Wang

et al. 2022

Intl J of Energy Research

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Influence of stage design parameters on ventilation power produced by steam turbine last stage blades during low load operation

Cited by 5 publications

References 14 publications

Enhancing low-pressure stage steam turbine using the TDLD criterion and the TOPSIS analysis

Enhancing low-pressure stage steam turbine using the TDLD criterion and the TOPSIS analysis

Flow and Vibration in the Small Steam Turbine Last Stage

Flow characteristics of last‐segment axial turbine adopted in compressed air energy storage system under low load and windage conditions

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