Multiobjective Optimization for Duct and Strut Design of an Annular Exhaust Diffuser

Schaefer, Philipp; Hofmann, Willy; Gieß, P.-A.

doi:10.1115/gt2012-69211

Cited by 5 publications

(3 citation statements)

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“…On the basis, in order to meet the design requirements and to maximize the aerodynamic performance of turbine-volute systems, the parametric optimization tool has been adopted to obtain the best results of exhaust volutes. Schaefer et al 45 described the aerodynamic multiobjective optimization process of an exhaust diffuser for turbomachinery by using the framework AutoOpti developed by DLR. It combines evolutionary strategies with surrogate models in order to select optimal geometric parameters.…”

Section: Design Optimization Of Exhaust Volutes Towards Improving the Turbine-volute Performancementioning

confidence: 99%

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

Gao

Tao

Huo

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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Marine, industrial, turboprop and turboshaft gas turbine engines use nonaxisymmetric exhaust volutes for flow diffusion and pressure recovery. These processes result in a three-dimensional complex turbulent flow in the exhaust volute. The flows in the axial turbine and nonaxisymmetric exhaust volute are closely coupled and inherently unsteady, and they have a great influence on the turbine and exhaust aerodynamic characteristics. Therefore, it is very necessary to carry out research on coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics, so as to provide reference for the high-efficiency turbine-volute designs. This paper summarizes and analyzes the recent advances in the field of coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery. This review covers the following topics that are important for turbine and volute coupled designs: (1) flow and loss characteristics of nonaxisymmetric exhaust volutes, (2) flow interactions between axial turbine and nonaxisymmetric exhaust volute, (3) improvement of turbine and volute performance within spatial limitations and (4) research methods of coupled turbine and exhaust volute aerodynamics. The emphasis is placed on the turbine-volute interactions and performance improvement. We also present our own insights regarding the current research trends and the prospects for future developments.

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Section: Design Optimization Of Exhaust Volutes Towards Improving the Turbine-volute Performancementioning

confidence: 99%

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

Gao

Tao

Huo

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

show abstract

“…We note that this gradient enhanced Kriging approach is a direction of ongoing development for the in house optimization process AuoOpti at the German Aerospace Center (DLR), see e.g. [85,57] for design studies using the AutoOpti framework. In our future work, we therefore intend to benchmark the EGO-based use of gradient information with the multi criteria descent algorithms and identify their respective advantages for gas turbine design.…”

Section: Gradient Enhanced Kriging For Efficient Objective Function A...mentioning

confidence: 99%

GivEn -- Shape Optimization for Gas Turbines in Volatile Energy Networks

Backhaus¹,

Bolten²,

Tanil³

et al. 2020

Preprint

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This paper describes the project GivEn that develops a novel multicriteria optimization process for gas turbine blades and vanes using modern "adjoint" shape optimization algorithms. Given the many start and shut-down processes of gas power plants in volatile energy grids, besides optimizing gas turbine geometries for efficiency, the durability understood as minimization of the probability of failure is a design objective of increasing importance. We also describe the underlying coupling structure of the multiphysical simulations and use modern, gradient based

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“…Hirschmann et al 26 and Volkmer et al 27 presented the hub extension and injection to control the separation of the diffuser and improve the aerodynamic performance of the exhaust diffuser. Schaefer et al 28 developed the multi-objective aerodynamic optimization of the duct and struts for maximization of the static pressure recovery performance of the exhaust diffuser at two inlet flow conditions. Guillot et al, 29 Xue et al 30 and Siorek et al 31 systematically investigated the flow field and aerodynamic performance of the diffuser-collector exhaust system for industrial gas turbines by experimental measurements and numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Effects of struts profiles and skewed angles on the aerodynamic performance of gas turbine exhaust diffuser

Dong

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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The strut structure directly affects the flow field characteristics and aerodynamic performance of the gas turbine exhaust diffuser. The effects of the strut profiles and strut skewed angles on the aerodynamic performance of the exhaust diffuser at different inlet pre-swirls were numerically investigated using three-dimensional Reynolds-Averaged Navier-Stokes(RANS) and Realizable k-ε turbulence model. The numerical static pressure recovery coefficient of the exhaust diffuser is in agreement with the experimental data well. The reliability of the numerical method for the exhaust diffuser performance analysis was demonstrated. Exhaust diffusers with four kinds of vertical strut profiles obtain the highest static pressure recovery coefficient at the inlet pre-swirl of 0.35. The similar static pressure recovery coefficient of exhaust diffusers with four kinds of vertical strut airfoils are observed when the inlet pre-swirl is less than 0.48. The static pressure recovery coefficient of exhaust diffusers with vertical b1 and b2 struts are higher than that with the a1 and a2 struts when the inlet pre-swirl is greater than 0.48. At the inlet pre-swirl of 0.35, The static pressure recovery coefficient of the exhaust diffuser with the a1 strut decreases with the increasing of the strut skewed angles. The static pressure recovery coefficient of the exhaust diffuser with the b1 strut increases with the increasing of the strut skewed angles, and the static pressure recovery coefficient increases by 3.6% compared with the vertical design when the skewed angle of b1 strut is 40[Formula: see text]. At the inlet pre-swirl of 0.64. The static pressure recovery coefficient of the exhaust diffuser with the a1 strut increases by 8.7% compared with the vertical design when the skewed angle of a1 strut is greater than 20°. In addition, the static pressure recovery coefficient of the exhaust diffuser with the b1 strut decreases by 3.8% compared with the vertical design when the skewed angle of b1 strut is 40°. The method to improve the aerodynamic performance of the exhaust diffuser by appropriate increase the strut maximum thickness and design the strut skewed angle is proposed in this work.

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Multiobjective Optimization for Duct and Strut Design of an Annular Exhaust Diffuser

Cited by 5 publications

References 0 publications

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

GivEn -- Shape Optimization for Gas Turbines in Volatile Energy Networks

Effects of struts profiles and skewed angles on the aerodynamic performance of gas turbine exhaust diffuser

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