Aerodynamic Characteristics of a Redesigned Turbine

Vassiliev, V. V.; Mooslechner, Norbert; Kostege, Mikhail; Granovskiy, A. V.

doi:10.1115/gt2007-27472

Cited by 3 publications

(2 citation statements)

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“…One percent improvement in LPT's efficiency contributes to about 0.7-0.9 percent increment in engine efficiency [1]. Hence, focused on LPT improvement, lots of companies developed more efficient engines [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Many researchers developed this method and utilized the optimization process to achieve more efficient engines. Aerodynamic optimization of GT13D3A gas turbine is presented by Vassiliev et al [3]. Referring to the experimental and theoretical data, the authors incorporate the aft-loaded concept for all turbine stationary and rotating blade rows.…”

Section: Introductionmentioning

confidence: 99%

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Performance Improvement of an Industrial Axial Turbine: Two-Stage Power Turbine Aerodynamic Optimization

Amini

Khavari

Alizadeh

2022

Preprint

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For high-aspect-ratio turbine blades, profile loss is dominant and its reduction is important for improving performance. In this paper, a two-stage low-pressure turbine (power turbine) is optimized in two steps: cycle optimization and aerodynamic optimization. In the cycle optimization step, the thermodynamic boundary condition of the turbine is modified. In the second step, which is the main focus of this study, the aerodynamic improvement of a turbine using a two-dimensional optimization technique is performed. The Genetic Algorithm (GA) is used in the optimization process to identify variables that satisfy a defined objective function which is subject to some constraints. The Artificial Neutral Network (ANN) is introduced to correlate variables with the defined objective functions and constraints. Maximum velocity and its location on the blade surface determine transition location and diffusion factor which directly affect total pressure losses. Therefore, in the optimization process, maximum velocity and its location are controlled and defined as objective functions. Profile shape at any given radius is represented with the camber-thickness method. The flow solver used for the aerodynamic analysis of profiles is the cascade analysis code MISES. After improving the performance of vanes and blades’ 2D sections, to be confident for performance enhancement of final power turbine ANSYS CFX is used. Finally, the aerodynamic characteristics of the power turbine using optimized geometries are discussed and compared to the original one. The results demonstrate a 1.19 percent improvement in power turbine efficiency at the same pressure ratio.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Improvement of an Industrial Axial Turbine: Two-Stage Power Turbine Aerodynamic Optimization

Amini

Khavari

Alizadeh

2022

Preprint

View full text Add to dashboard Cite

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Impact of the Inflow Conditions on the Heavy-Duty Gas Turbine Exhaust Diffuser Performance

Vassiliev

Irmisch

Abdel-Wahab

et al. 2011

Journal of Turbomachinery

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The flow in exhaust diffusers along with the channel geometry strongly depends on the inflow conditions, including Mach number level, total pressure distribution, flow angle, and turbulence. In the first part of this paper, the impact of these parameters is analyzed using computational fluid dynamics, experimental data from the test rig, and field measurements. A widespread opinion is that the optimal condition for the diffuser is an axial uniform inflow. However, it is shown in this paper that nonuniform pressure distribution compared with a uniform one can lead to better diffuser performance and that a moderate residual swirl can improve the performance as well. In the second part of this paper, the minimization of exhaust losses in heavy-duty gas turbines is discussed and illustrated by two practical examples.

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Impact of the Inflow Conditions on the Heavy-Duty Gas Turbine Exhaust Diffusers Performance

Vassiliev

Irmisch

Abdel-Wahab

et al. 2010

Volume 7: Turbomachinery, Parts A, B, and C

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The flow in exhaust diffusers along with the channel geometry strongly depends on the inflow conditions, including Mach number level, total pressure distribution, flow angle, and turbulence. In the first part of this paper, the impact of these parameters is analyzed using CFD, experimental data from the test rig and field measurements. A widespread opinion is that the optimal condition for the diffuser is an axial uniform inflow. However, it is shown in this paper that non-uniform pressure distribution as compared to a uniform one can lead to better diffuser performance and that moderate residual swirl can improve the performance as well. In the second part of the paper, the minimization of exhaust losses in heavy-duty gas turbines is discussed and illustrated by two practical examples.

show abstract

Aerodynamic Characteristics of a Redesigned Turbine

Cited by 3 publications

References 0 publications

Performance Improvement of an Industrial Axial Turbine: Two-Stage Power Turbine Aerodynamic Optimization

Performance Improvement of an Industrial Axial Turbine: Two-Stage Power Turbine Aerodynamic Optimization

Impact of the Inflow Conditions on the Heavy-Duty Gas Turbine Exhaust Diffuser Performance

Impact of the Inflow Conditions on the Heavy-Duty Gas Turbine Exhaust Diffusers Performance

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