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Lubricants
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Wear Prediction in Aeroengine Rotor System
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Wear Prediction in Aeroengine Rotor System

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 9350

Special Issue Editor

Dr. Guang Zhao

E-Mail Website
Guest Editor
School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
Interests: aero-engine; rotor

Special Issue Information

Dear Colleagues,

An aero-engine is called the heart of the aircraft, and the reliability of the aero-engine is the integral to the safe and stable operation of the aircraft. In recent years, people have had increasingly higher requirements for the safety and stable operation performance of aviation, which makes the aero-engine system more complex and advanced, though it is also facing a lot of other challenges. As you know, wear is a common damage failure form of aero-engine mechanical parts, which widely occurs in aero-engine matching structure, seriously threatens the life of many structural parts, directly affects the operational efficiency of the aero-engine, and even brings more severe accidents. Therefore, the wear prediction and study of the aero-engine rotor system is critical in order to improve the reliability of the aero-engine in the actual operation, evaluate the continuous damage process, reduce the degree of mechanical wear and failure problems, and improve the structural design related to wear failure.

This Special Issue aims to collect the leading papers in the field of wear prediction in the aero-engine rotor system. We sincerely hope that you will accept our invitation to contribute to this Special Issue.

Dr. Guang Zhao
Guest Editor

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. Lubricants 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 2600 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

  • wear mechanisms
  • wear law
  • wear prediction
  • aero-engine
  • rotor

Published Papers (6 papers)

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Research

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30 pages, 13786 KiB  
Article
A Study on the Influence of Nonlinear Vibration on Fretting Damage of Involute Spline Pairs in Aero-Engines
by Xiangzhen Xue, Yifan Li, Kuan Lin, Liqi Sui, Yiqiang Jiang and Ning Zhang
Lubricants 2023, 11(12), 515; https://doi.org/10.3390/lubricants11120515 - 06 Dec 2023
Viewed by 1183
Abstract
To meticulously examine the repercussions of nonlinear vibrations on fretting damage within aero-engine involute spline pairs, a dynamic model was constructed rooted in well-established theories and methodologies. MATLAB was engaged to resolve the model, where the vibration displacement function was treated under Fourier [...] Read more.
To meticulously examine the repercussions of nonlinear vibrations on fretting damage within aero-engine involute spline pairs, a dynamic model was constructed rooted in well-established theories and methodologies. MATLAB was engaged to resolve the model, where the vibration displacement function was treated under Fourier transformation. The emergent sub-model was then integrated into finite element analysis software to scrutinize the distribution curves of fretting damage over the external spline tooth surface. The analysis included a comprehensive comparison of the axial and radial distributions, in addition to scenarios with and without vibration interferences. Further, an empirical platform was devised to authenticate the outcomes harvested through finite element simulation. The results indicate that the principal mode of fretting damage failure in aero-engine involute spline pairs fundamentally comprises fretting wear. This wear occurs throughout the rotational period of the fretting cycle and reciprocally interacts with fretting fatigue phenomena. Significantly, it was ascertained that acute nonlinear vibrations escalate the magnitude of fretting damage and the quantity of worn teeth within aero-engine spline pairs. Beyond that, angular misalignment was recognized as an aggravating factor that compounds fretting damage in the secondary bond teeth of involute spline pairs. These newfound insights are of paramount significance for the strategic design of involute splines to combat wear. Full article
(This article belongs to the Special Issue Wear Prediction in Aeroengine Rotor System)
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20 pages, 11651 KiB  
Article
Finite Element Simulation and Fretting Wear Prediction of a Tenon Connection Structure
by Zexin Zhang, Guang Zhao, Yunbo Yuan, Hongxiao Zhang and Yuping Wu
Lubricants 2023, 11(10), 421; https://doi.org/10.3390/lubricants11100421 - 30 Sep 2023
Cited by 1 | Viewed by 990
Abstract
A tenon connection structure is widely used for the blade-disk connection in turbomachinery, and its ability to resist wear influences operation life. The finite element method (FEM) has been extensively applied in predicting fretting wear due to its advantage in solving problems like [...] Read more.
A tenon connection structure is widely used for the blade-disk connection in turbomachinery, and its ability to resist wear influences operation life. The finite element method (FEM) has been extensively applied in predicting fretting wear due to its advantage in solving problems like the non-linearity of boundary conditions. This work proposes a model that combines a modified Archard model with FEM to simulate fretting wear in multiple pairs of contact curved surfaces of the tenon connection structure. The model considers various factors, including the direction of fretting, time, load magnitude, and the application of aerodynamic load. The results indicate that the direction of fretting has a significant effect on the wear of the tenon connection structure. The wear depth of the tenon connection structure caused by axial fretting is nearly twice that of circumferential and radial fretting, and the corresponding wear depth values are 57.22, 30.85, and 24.36 µm in this study, respectively, and the rate of change in wear depth increases over time, while the contact pressure decreases initially and then increases with continuous wear. This study provides valuable insight into the impact of fretting under different working conditions on the wear of turbine tenon connection structures, which is of great significance for their wear-resistant design and life prediction. Full article
(This article belongs to the Special Issue Wear Prediction in Aeroengine Rotor System)
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27 pages, 15012 KiB  
Article
Research on Oil–Gas Two-Phase Flow Characteristics and Improvement of Aero-Engine Bearing Chamber
by Guozhe Ren, Yanpeng Li, Huan Zhao, Yang Yan, Wenfeng Xu and Dan Sun
Lubricants 2023, 11(9), 360; https://doi.org/10.3390/lubricants11090360 - 23 Aug 2023
Viewed by 873
Abstract
In order to study the oil–gas two-phase flow characteristics of an aero-engine bearing chamber and improve the scavenge effect of lubricating oil, the two-phase flow solution model of a bearing chamber based on the Euler–Euler method was established. Three improvement schemes were proposed [...] Read more.
In order to study the oil–gas two-phase flow characteristics of an aero-engine bearing chamber and improve the scavenge effect of lubricating oil, the two-phase flow solution model of a bearing chamber based on the Euler–Euler method was established. Three improvement schemes were proposed for the ventilation structure and scavenge structure of the bearing chamber. The flow characteristics and scavenge characteristics of a conventional bearing chamber and three improvement schemes under different working conditions were analyzed in depth. The results show that after the conventional bearing chamber ventilation structure is embedded (Embed) and improved, with the increase in the embedding depth, the oil in the cavity is further blocked in the cavity, the amount of oil flowing out from the vent is further reduced, and the scavenge efficiency is further improved. After the slope improvement of the scavenge structure of the conventional bearing chamber, due to the increase in the depth of the oil return groove, the drag effect of the air shear force in the cavity on the oil in the oil return groove is further weakened, and the oil accumulation area on the right side of the scavenge port is further suppressed. The volume fraction of the oil in the cavity is further reduced, and the scavenge efficiency is further improved. The combined improvement scheme (ES) can take into account the advantages of embedding and slope improvement schemes, and further improve the scavenge efficiency. Compared to the conventional bearing chamber, when the oil flow rate is 200 L/h and the speed is 15,000 r/min, the oil return efficiency of the embedded (h = 12 mm), slope (l = 56 mm) and combined improvement schemes are increased by 20.19%, 13.43%, and 37.94%, respectively. Full article
(This article belongs to the Special Issue Wear Prediction in Aeroengine Rotor System)
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29 pages, 9354 KiB  
Article
The Effect of Dry Friction upon the Dynamics of a Short Eccentric Rotor: An Analytical and Experimental Study
by Stelian Alaci, Ilie Musca, Carmen Bujoreanu, Ionut-Cristian Romanu, Nicolae-Adrian Nitu and Florina-Carmen Ciornei
Lubricants 2023, 11(8), 340; https://doi.org/10.3390/lubricants11080340 - 09 Aug 2023
Viewed by 812
Abstract
The paper proposes the study of dry friction by means of a short eccentric rotor. The rotor was designed and realised in the laboratory. In an ideal frictionless situation, a rotor actuated by gravity will have an angular velocity which increases indefinitely. The [...] Read more.
The paper proposes the study of dry friction by means of a short eccentric rotor. The rotor was designed and realised in the laboratory. In an ideal frictionless situation, a rotor actuated by gravity will have an angular velocity which increases indefinitely. The analytical model assumes dry friction in the bushing of the rotor and the main result reveals that the angular velocity either stabilizes around a certain value or drops to zero. Two situations of friction were considered for the theoretical model: first only dynamic friction and secondly, both static and dynamic friction are present. The analytical model of the dynamics of the rotor presents the advantage that it can be applied for diverse friction cases, from dry friction to complex dry friction and wet friction. Experimental tests were carried out on the designed and constructed device; they are in very good agreement with the results of the theoretical model. Full article
(This article belongs to the Special Issue Wear Prediction in Aeroengine Rotor System)
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19 pages, 14377 KiB  
Article
Prediction and Experimental Validation of Aviation Floating Involute Spline
by Xiangzhen Xue, Jian Liu, Jipeng Jia, Siwei Yang and Yifan Li
Lubricants 2022, 10(10), 270; https://doi.org/10.3390/lubricants10100270 - 20 Oct 2022
Cited by 2 | Viewed by 1612
Abstract
Based on the research on the wear mechanism of floating involute spline coupling, combined with the traditional Archard wear equation, a wear prediction model of aviation floating involute spline coupling was established. The transient simulation of spline coupling with floating distances of 0 [...] Read more.
Based on the research on the wear mechanism of floating involute spline coupling, combined with the traditional Archard wear equation, a wear prediction model of aviation floating involute spline coupling was established. The transient simulation of spline coupling with floating distances of 0 mm, 0.3 mm, and 0.6 mm was carried out using Abaqus, and the accuracy of the theoretical model was verified by analyzing the wear and failure parts of the spline coupling. The analysis results show that there is oxidation wear, adhesive wear, abrasive wear, and other wear forms on the tooth surface of the aviation floating involute spline coupling. Under the influence of the floating distance of the spline coupling, the calculation results are closer to the actual working situations. In addition, with increasing floating distance, the wear depth of the tooth surface increases significantly, and the wear depth becomes larger and larger along the floating end. The above study provides a theoretical basis for designing and maintaining aerospace involute spline couplings. Full article
(This article belongs to the Special Issue Wear Prediction in Aeroengine Rotor System)
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Review

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19 pages, 7640 KiB  
Review
A Review of Aviation Spline Research
by Guang Zhao, Xiangyang Zhao, Liting Qian, Yunbo Yuan, Song Ma and Mei Guo
Lubricants 2023, 11(1), 6; https://doi.org/10.3390/lubricants11010006 - 25 Dec 2022
Cited by 4 | Viewed by 3238
Abstract
Splines are irreplaceable in high-speed aviation fields due to their simplicity, reliability, and high specific power. Aviation splines are not only subjected to severe operating mechanical loads, but also sometimes operate under grease-lubricated and non-lubricated environments. All of this results in aviation splines [...] Read more.
Splines are irreplaceable in high-speed aviation fields due to their simplicity, reliability, and high specific power. Aviation splines are not only subjected to severe operating mechanical loads, but also sometimes operate under grease-lubricated and non-lubricated environments. All of this results in aviation splines suffering widespread failures. Since the 1960s, many researchers have carried out much research on aviation splines. The wide range of research topics demonstrates the technical challenges of understanding aviation spline. This paper reviews the research of aviation spline from the aspects of failure form, fatigue strength, surface contact stress, effects of lubrication, and misalignment on wear, as well as experiments. Relevant research shows crowned splines can mitigate the spline wear process induced by angular misalignment, and oil-lubricating splines experience almost no wear. This paper also looks forward to the future development directions of aviation splines. Full article
(This article belongs to the Special Issue Wear Prediction in Aeroengine Rotor System)
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