On the performance enhancement of thermo-compressor and steam turbine blade cascade in the presence of spontaneous nucleation

Ahmadpour, Ali; Abadi, S.M.A. Noori Rahim; Meyer, Josua P.

doi:10.1016/j.energy.2016.11.022

Cited by 31 publications

(13 citation statements)

References 34 publications

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“…Blades are important components in power and energy equipment. The formability of material and the complexity of structural shape are two key factors during the design and manufacture process of blades . In practical engineering, blades are often manufactured as smooth curved surface shapes to satisfy the performance requirements for harsh environment.…”

Section: Introductionmentioning

confidence: 99%

“…The formability of material and the complexity of structural shape are two key factors during the design and manufacture process of blades. [4][5][6] In practical engineering, blades are often manufactured as smooth curved surface shapes to satisfy the performance requirements for harsh environment. These smooth curved surface shapes can generate wake flow field, secondary flow, and boundary layer separation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structural reliability analysis and uncertainties‐based collaborative design and optimization of turbine blades using surrogate model

Meng

Yang

Zhang³

et al. 2018

Fatigue Fract Eng Mat Struct

136

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In power and energy systems, both the aerodynamic performance and the structure reliability of turbine equipment are affected by utilized blades. In general, the design process of blade is high dimensional and nonlinear. Different coupled disciplines are also involved during this process. Moreover, unavoidable uncertainties are transported and accumulated between these coupled disciplines, which may cause turbine equipment to be unsafe. In this study, a saddlepoint approximation reliability analysis method is introduced and combined with collaborative optimization method to address the above challenge. During the above reliability analysis and design optimization process, surrogate models are utilized to alleviate the computational burden for uncertainties‐based multidisciplinary design and optimization problems. Smooth response surfaces of the performance of turbine blades are constructed instead of expensively time‐consuming simulations. A turbine blade design problem is solved here to validate the effectiveness and show the utilization of the given approach.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural reliability analysis and uncertainties‐based collaborative design and optimization of turbine blades using surrogate model

Meng

Yang

Zhang³

et al. 2018

Fatigue Fract Eng Mat Struct

136

View full text Add to dashboard Cite

show abstract

“…The last few low-pressure cylinder stages of a condensing steam turbine in a traditional power plant and all stages of a water-cooled nuclear reactor steam turbine operate in the wet steam zone. 6,7 Existing research on wet steam condensation flow can be divided into four approaches: condensation theory, experimental research, numerical research, and analytical research. Second, the droplet trajectories in the wet steam flow lead to water erosion in several stages at the end of the turbine.…”

Section: Introductionmentioning

confidence: 99%

“…5 Spontaneous two-phase condensation flow in a steam turbine is highly complex; the study of such flow involves numerous disciplines of computational fluid dynamics, multiphase flow, heat and mass transfer, statistical thermodynamics and gas dynamics. 6,7 Existing research on wet steam condensation flow can be divided into four approaches: condensation theory, experimental research, numerical research, and analytical research. 8,9 Condensation theory includes the nucleation model and the water-droplet growth model.…”

Section: Introductionmentioning

confidence: 99%

Effect of the nonaxisymmetric endwall on wet steam condensation flow in a stator cascade

Han

et al. 2019

Energy Science & Engineering

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Steam turbines are critical pieces of power equipment in the electric power industry, and the study of wet steam condensation flow is important for improving the efficiency and safety of steam turbines. Wet steam nucleation, which is the main reason for thermodynamic losses, usually occurs downstream of the stator cascade. The mechanism of secondary flow loss control by the nonaxisymmetric endwall is the change of pressure distribution in the cascade channel. This mechanism also affects the wet steam condensation phenomenon. The positive/cosine function was proposed for endwall modification in the nucleation stage of a steam turbine. The design method presented in this paper can be used to produce endwall protrusions with different heights at different axial chords. To analyze the influence of the endwall protrusion design parameters on the condensation flow, nine endwall protrusion models were set up at varied axial positions. In comparison with the original cascade, the total pressure loss coefficient and outlet wetness were found to be ideal when the endwall protrusion maximum height was located at the 50% axial chord length of the stator and the protrusion was 3% of the blade height. The ideal incidence angle of this modified cascade was from −2° to + 10°.

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“…Abadi et al [19] applied a two-fluid multiphase model for predicting the homogeneous condensation within a high-pressure ejector. Furthermore, volumetric cooling and inlet superheating were explored by Ahmadpour et al [20] to control the homogeneous condensation within the ejector, which were proved to have the capability of decreasing wetness losses, while enhancing ejector performance. Biferi et al [21] compared homogeneous equilibrium model and non-equilibrium model for the prediction of condensation inside the ejector.…”

Section: Introductionmentioning

confidence: 99%

Influences of area ratio and surface roughness on homogeneous condensation in ejector primary nozzle

Wang

Zou

et al. 2017

Energy Conversion and Management

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On the performance enhancement of thermo-compressor and steam turbine blade cascade in the presence of spontaneous nucleation

Cited by 31 publications

References 34 publications

Structural reliability analysis and uncertainties‐based collaborative design and optimization of turbine blades using surrogate model

Structural reliability analysis and uncertainties‐based collaborative design and optimization of turbine blades using surrogate model

Effect of the nonaxisymmetric endwall on wet steam condensation flow in a stator cascade

Influences of area ratio and surface roughness on homogeneous condensation in ejector primary nozzle

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