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Machines
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Power and Propulsion Engineering
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Power and Propulsion Engineering

A special issue of Machines (ISSN 2075-1702).

Deadline for manuscript submissions: 28 February 2025 | Viewed by 1500

Special Issue Editors

Prof. Dr. Dingxi Wang

E-Mail Website
Guest Editor
School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
Interests: turbomachinery aerodynamics; aeroelasticity; numerical methods; shape optimization
Special Issues, Collections and Topics in MDPI journals
Dr. Penghao Duan

E-Mail Website
Guest Editor
Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
Interests: heat transfer; mesh generation; turbine blade design and optimization
Dr. Min Yao

E-Mail Website
Guest Editor
Institute for Aero Engine, Tsinghua University, Beijing 100084, China
Interests: high-order CFD method; multi-scale method for turbulent flows; machine learning/deep learning for flow prediction; film cooling design and optimization

Special Issue Information

Dear Colleagues,

The Chinese International Turbomachinery Conference (CITC), first established in 2013, has emerged as a prominent and widely recognized platform where researchers in the field of turbomachinery from across the globe converge to exchange ideas and foster academic collaboration. As the leading international conference of its kind, CITC has continually expanded both in participant numbers and thematic coverage since its inception. This year's conference (CITC 2024) is scheduled to take place from August 1 to 4, 2024, in Sanya, Hainan Province. Papers selected by the conference's review chairs and co-chairs will be recommended for inclusion in this Special Issue. 

The topics to be addressed in the Special Issue include, but are not limited to, the following areas:

1. Aerodynamics/Hydrodynamics

  • Advanced numerical methods and simulations;
  • Experiments and measurement techniques;
  • Post-processing and data analysis;
  • Design and optimization.

2. Structures and System Dynamics

  • Bearings and seals;
  • Corrosion;
  • Reliability analysis;
  • Fatigue, vibration, fracture and life prediction;
  • Rotor dynamics;
  • Design and optimization.

3. Aeroelasticity

4. Heat transfer

5. Combustion

6. Aeroacoustics

7. Manufacturing processes and new materials

8. Fault diagnostics and maintenance

9. AI + turbomachinery

10. New products and applications

Prof. Dr. Dingxi Wang
Dr. Penghao Duan
Dr. Min Yao
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Machines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • turbomachinery
  • aerodynamics
  • hydrodynamics
  • structural dynamics
  • aeroelasticity
  • aeroacoustics
  • heat transfer
  • manufacturing
  • diagnostics
  • maintenance
  • digit twin

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  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
  • Expansion of research network: Special Issues facilitate connections among authors, fostering scientific collaborations.
  • External promotion: Articles in Special Issues are often promoted through the journal's social media, increasing their visibility.
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Further information on MDPI's Special Issue polices can be found here.

Related Special Issue

Published Papers (3 papers)

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Research

14 pages, 9345 KiB  
Article
Effect of Oil Film Radial Clearances on Dynamic Characteristics of Variable Speed Rotor with Non-Concentric SFD
by Weijian Nie, Xiaoguang Yang, Guang Tang, Qicheng Zhang and Ge Wang
Machines 2024, 12(12), 882; https://doi.org/10.3390/machines12120882 - 5 Dec 2024
Viewed by 360
Abstract
Variable-speed aircraft engines require the power turbine rotor to operate stably within a wide range of output speeds, posing a challenge for rotor vibration reduction design. Non-concentric squeeze film dampers (NCSFDs) have been widely used in rotor vibration reduction design due to their [...] Read more.
Variable-speed aircraft engines require the power turbine rotor to operate stably within a wide range of output speeds, posing a challenge for rotor vibration reduction design. Non-concentric squeeze film dampers (NCSFDs) have been widely used in rotor vibration reduction design due to their simple structure. However, comprehensive research on the matching and applicability of NCSFDs under varying operating speeds is lacking. Therefore, this paper investigates the influence of oil film radial clearances on the dynamic characteristics of a variable-speed rotor system with an NCSFD, examining its suitability across variable speeds. This study introduces the principle of equivalent rotor dynamics similarity design, demonstrating good consistency between simulated and real rotor dynamic characteristics, with a radial clearance of 0.10 mm being deemed optimal. The vibration response variation in the rotor at a fixed speed within the range of 0.51 n to 1.0 n does not exceed 4 μm, and the vibration acceleration variation does not exceed 0.04 g, indicating a wide, stable operating speed range. This study can be helpful for the engineering design and vibration reduction design of variable-speed rotors in aircraft engines. Full article
(This article belongs to the Special Issue Power and Propulsion Engineering)
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16 pages, 6200 KiB  
Article
Numerical Analysis of Bionic Inlet Nozzle Effects on Squirrel-Cage Fan Flow Characteristics
by Hao Zhou, Wei Wang, Tiancong Hu and Jun Wang
Machines 2024, 12(12), 858; https://doi.org/10.3390/machines12120858 - 27 Nov 2024
Viewed by 390
Abstract
In order to improve the inlet distortion of the squirrel-cage fan, this study proposes a parametric design method for the bionic structure of the inlet nozzle generatrix, which is spliced by multiple sinusoidal curves, based on the bionic structure of the humpback whale [...] Read more.
In order to improve the inlet distortion of the squirrel-cage fan, this study proposes a parametric design method for the bionic structure of the inlet nozzle generatrix, which is spliced by multiple sinusoidal curves, based on the bionic structure of the humpback whale flipper leading-edge nodule. The geometric shape of the bionic generatrix is controlled by three parameters: the number of segments n, the amplitude ratio Tm, and the amplitude of the last curve An. These parameters are optimized through orthogonal tests and numerical simulations, with the aim of improving the fan’s aerodynamic efficiency. Based on the selected solution, a comparative analysis is conducted to examine the impact of cylindrical, conical, and bionic inlet nozzles on inlet distortion and flow evolution within the centrifugal fan. Numerical calculations demonstrate that the fan’s maximum total efficiency, with a bionic inlet nozzle designed in a rational manner, is 5.46% higher than that of the original fan and is 2.01% higher than that of the fan with a conical inlet nozzle. The proposed bionic structure can create a buffer zone at the fan’s inlet, thereby reducing the region of high vorticity caused by the separated flow. Consequently, this improvement leads to enhanced uniformity at the impeller’s inlet. Furthermore, the design method proposed in this study for the inlet nozzle’s bionic structure effectively regulates the airflow angle near the impeller shroud, thereby enhancing the fan’s inlet distortion and improving its overall aerodynamic performance. Full article
(This article belongs to the Special Issue Power and Propulsion Engineering)
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18 pages, 11406 KiB  
Article
Coupling Interface Load Identification of Sliding Bearing in Wind Turbine Gearbox Based on Polynomial Structure Selection Technique
by Wengui Mao, Jie Wang and Shixiong Pei
Machines 2024, 12(12), 848; https://doi.org/10.3390/machines12120848 - 26 Nov 2024
Viewed by 362
Abstract
Sliding bearings are widely used in wind turbine gearboxes, and the accurate identification of coupling interface loads is critical for ensuring the reliability and performance of these systems. However, the space–time coupling nature of these loads makes them difficult to calculate and measure [...] Read more.
Sliding bearings are widely used in wind turbine gearboxes, and the accurate identification of coupling interface loads is critical for ensuring the reliability and performance of these systems. However, the space–time coupling nature of these loads makes them difficult to calculate and measure directly. An improved method utilizing the POD decomposition algorithm and polynomial selection technology is proposed in this paper to identify the sliding bearing coupling interface loads. By using the POD decomposition algorithm, the sliding bearing coupling interface loads can be decomposed into the form of a series of independent oil film time history and spatial distribution functions. Then, it can be converted into space–time independent sub-coupled interface load identification in which oil film time history can be transformed into the recognition of a certain order modal load and the corresponding oil film spatial distribution function can be fitted with a set of Chebyshev orthogonal polynomial. To address the ill-posedness caused by the weak correlation between the modal matrix and polynomial options during the identification process, this paper introduces polynomial structure selection technology. Firstly, displacement responses are collected, and a series of modal loads are identified using conventional concentrated load identification methods. Then, the polynomial structure selection technology is applied to select the effective modal shape matrix, using a specific mode load as the oil film time history function. The load ratios of other mode loads to this reference mode load are compared, and the effective Chebyshev orthogonal polynomials are selected based on the error reduction ratio. Finally, multiplying the identified oil film time histories by the corresponding oil film spatial distribution functions yields the coupling interface load. The results of the numerical examples verify the improved method’s rationality and effectiveness. Full article
(This article belongs to the Special Issue Power and Propulsion Engineering)
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