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Latest Research of Turbomachinery and Gas Turbines
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Latest Research of Turbomachinery and Gas Turbines

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J: Thermal Management".

Deadline for manuscript submissions: closed (30 November 2023) | Viewed by 3298

Special Issue Editors

Dr. Weihao Zhang

E-Mail Website
Guest Editor
National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics, School of Energy & Power Engineering, Beihang University, Beijing 100191, China
Interests: gas turbine; aerothermodynamics; aerodynamic design; flow control
Dr. Yanfeng Zhang

E-Mail Website
Guest Editor
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China
Interests: turbomachinery aerodynamics; aeroelasticity; computational fluid dynamics and aerodynamic design optimization

Special Issue Information

Dear Colleagues,

Gas turbines are widely used in the aviation, navigation, and power fields because of the advantages of high-power density, high efficiency, and good performance in wide working conditions. Continuously improving the efficiency and power of gas turbines has always been the goal pursued by researchers and is of great value to the industrial field. In recent years, with the continuous development of numerical simulation and experimental technology, we have deepened our understanding of the key issues of turbomachinery and gas turbines, promoting the continuous improvement of the design level of turbomachinery and gas turbines. The purpose of this Special Issue is to focus on new progress in the fields of turbomachinery and gas turbines and to present the latest research achievements. The topics of this Special Issue include but are not limited to numerical simulation techniques, experimental techniques, flow mechanism and aerodynamic design of turbomachinery, heat transfer of turbine blades, secondary air systems, multidisciplinary coupling, etc. In addition, we look forward to more review articles presenting progress and challenges in advanced turbomachinery and gas turbines.

Dr. Weihao Zhang
Dr. Yanfeng Zhang
Guest Editors

Manuscript Submission Information

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Keywords

  • flow mechanism in gas turbines
  • secondary vortex in gas turbines
  • unsteady flow in gas turbines
  • flow control for gas turbines
  • boundary layer control
  • tip leakage flows
  • computational fluid dynamics for turbomachinery
  • experimental technique for turbomachinery
  • aerodynamic design of turbomachinery
  • cooling of gas turbines
  • multidisciplinary coupling in gas turbines
  • combustion and combustors in gas turbines
  • secondary air systems

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Published Papers (2 papers)

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Research

22 pages, 15672 KiB  
Article
Non-Intrusive Reduced-Order Modeling Based on Parametrized Proper Orthogonal Decomposition
by Teng Li, Tianyu Pan, Xiangxin Zhou, Kun Zhang and Jianyao Yao
Energies 2024, 17(1), 146; https://doi.org/10.3390/en17010146 - 27 Dec 2023
Cited by 4 | Viewed by 1123
Abstract
A new non-intrusive reduced-order modeling method based on space-time parameter decoupling for parametrized time-dependent problems is proposed. This method requires the preparation of a database comprising high-fidelity solutions. The spatial bases are extracted from the database through first-level proper orthogonal decomposition (POD). The [...] Read more.
A new non-intrusive reduced-order modeling method based on space-time parameter decoupling for parametrized time-dependent problems is proposed. This method requires the preparation of a database comprising high-fidelity solutions. The spatial bases are extracted from the database through first-level proper orthogonal decomposition (POD). The algebraic relationship between the time trajectory/parameter positions and the projection coefficient is described by the linear superposition of the second-level POD bases (temporal bases) and the second-level projection coefficients (parameter-dependent coefficients). This decomposition strategy decouples the space-time parameter effects, providing a stable foundation for fast predictions of parametrized time-dependent problems. The mappings between the parameter locations and the parameter-dependent coefficients are approximated as Gaussian process regression (GPR) models. The accuracy and efficiency of the PPOD-ROM are demonstrated through two numerical examples: flows past a cylinder and turbine flows with a clocking effect. Full article
(This article belongs to the Special Issue Latest Research of Turbomachinery and Gas Turbines)
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24 pages, 16590 KiB  
Article
Unsteady Effects of Wake on Downstream Rotor at Low Reynolds Numbers
by Lin Li, Wei Tan, Jianshe Zhang, Ge Han and Yanfeng Zhang
Energies 2022, 15(18), 6692; https://doi.org/10.3390/en15186692 - 13 Sep 2022
Cited by 2 | Viewed by 1593
Abstract
In a compressor, the periodic wake is an inherently unsteady phenomenon that affects the downstream flow conditions and loading distribution. Thus, understanding the physical mechanisms of these unsteady effects is important for eliminating flow losses and improving compressor performance, particularly at low Reynolds [...] Read more.
In a compressor, the periodic wake is an inherently unsteady phenomenon that affects the downstream flow conditions and loading distribution. Thus, understanding the physical mechanisms of these unsteady effects is important for eliminating flow losses and improving compressor performance, particularly at low Reynolds numbers. To understand the influence of the upstream wake on the downstream flow field structure, this paper describes numerical simulations of a one-stage high-pressure compressor at altitudes of 10–20 km. The influence of the wake on rotor flow blockage at different Reynolds numbers is analyzed, and the unsteady interaction between the upstream wake and boundary layer or tip leakage flow is discussed. The results indicate that the wake has a beneficial effect on the efficiency of the rotor at high Reynolds numbers, but this weakens and becomes negative as the Reynolds number decreases. The wake can reduce the flow blockage in the mainflow region. Due to the wake, the length of the laminar separation bubble at high Reynolds numbers decreases and that at low Reynolds numbers increases. In addition, the unsteadiness of the wake causes separation bubbles to appear periodically at high Reynolds numbers and induces an open separation bubble at low Reynolds numbers. The Kelvin–Helmholtz instability can dominate the transition process of the boundary layer, which is also affected by the disturbance vortex induced by the wake. Regarding the tip leakage flow, the wake can reduce the flow blockage at high Reynolds numbers but increase the flow blockage at low Reynolds numbers. The interaction at low Reynolds numbers causes a double-leakage flow, which finally leads to the large-scale separation of the suction surface boundary layer. The large-scale separation causes flow blockage in the tip region and prevents the rotor wake from propagating downstream. On the contrary, the unsteady wake can pass through the tip clearance vortex and inhibit the separation of the suction boundary layer at high Reynolds numbers, which is reflected in a larger amplitude of one blade passage frequency. Therefore, the flow loss in the downstream flow field at high Reynolds numbers is significantly reduced at high Reynolds numbers. Full article
(This article belongs to the Special Issue Latest Research of Turbomachinery and Gas Turbines)
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