Article
Energy & Fuels
Kanmaniraja Radhakrishnan, Jun Su Park
Summary: This study conducted thermal analysis and creep lifetime prediction on gas turbine combustor liner using three different TBC thicknesses, showing that increasing TBC thickness can effectively decrease the inner metal temperature and extend the lifespan of the liner.
Article
Materials Science, Coatings & Films
Y. Q. Xiao, Z. Y. Liu, W. Zhu, X. M. Peng
Summary: This paper introduces a method to analyze the lifetime variation of thermal barrier coatings (TBCs) under different working conditions, combining probabilistic methods and lifetime prediction models. The performance of TBCs is studied by setting failure criteria and calculating failure probabilities. Experimental results show that the predictive failure probabilities of TBCs under furnace isothermal cycling are 0.1% at 300 cycles, and the maximum failure probabilities of TBCs under a hot gas stream increase with time.
SURFACE & COATINGS TECHNOLOGY
(2021)
Review
Materials Science, Multidisciplinary
Salmi Mohd Yunus, Savisha Mahalingam, Abreeza Manap, Nurfanizan Mohd Afandi, Meenaloshini Satgunam
Summary: Studying the performance of TBC in different operational modes is crucial for understanding its behavior, damage mechanism, and predicting lifespan under specific operating conditions. Current research mainly focuses on gas turbine conditions requiring assistance from a cooling air system, but further studies are needed to simulate the complete TBC performance under advanced gas turbine conditions.
Article
Materials Science, Ceramics
D. H. Kim, K. K. Kim, K. B. Park, J. H. Yun, C. S. Seok
Summary: This study proposes a method to predict the fatigue life of TBCs with different microstructures using the Goodman method. The FEM was used to evaluate the impact of the top coating's microstructure on thermal stress. A fatigue life prediction equation was derived by converting stress into stress amplitude and verified through thermal fatigue tests on specimens with different microstructures of top coatings.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Coatings & Films
Mohammad Jafari Eskandari, Meysam Karimi, Masoud Araghchi, Ali Hadipour
Summary: This study investigated the effectiveness of laser cleaning in removing contaminants from the surface of a turbine blade. Various tests and analyses were conducted, and the optimal parameters for the laser cleaning process were determined. The results demonstrated that this method can completely eliminate targeted contaminants.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
Taoyuan Ouyang, Jinping Suo
Summary: TiC-based self-healing coatings have shown great potential in improving the lifetime of TBC by suppressing TGO growth. The TAZ20 coating exhibited sealing and filling effects, providing good oxidation resistance at high temperatures. Different structural strategies of TAZ20 coatings were found to influence their oxidation resistance performance.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Energy & Fuels
Yuanzhe Zhang, Pei Liu, Zheng Li
Summary: Inlet temperature is crucial for the thermal efficiency of gas turbines, and blade cooling is a key method to maintain high inlet temperatures. However, the use of thermal barrier coatings (TBCs) for cooling may change the heat transfer characteristics and pose challenges in calculating internal temperature and thermal efficiency. This study analyzes the impact of TBC thickness on the performance of gas turbines and proposes an improved mathematical model to consider the cooling effect of TBCs.
Article
Materials Science, Ceramics
D. H. Kim, K. K. Kim, B. W. Moon, K. B. Park, S. Park, C. S. Seok
Summary: This study investigated the growth behavior of thermally grown oxide (TGO) on thermal barrier coatings (TBC) with different microstructures through isothermal degradation tests. The results confirmed that the growth of TGO is influenced by the microstructure of the top coating, leading to the development of a new equation for predicting TGO growth behavior.
CERAMICS INTERNATIONAL
(2021)
Article
Thermodynamics
Xiaoru Qian, Peigang Yan, Xiangfeng Wang, Wanjin Han
Summary: Based on a multidisciplinary method, this study investigates the aerothermal performance and thermal stress of the first stage Ni-based superalloy turbine guide vane. The results show that the thermal barrier coating (TBC) reduces the highest and average temperatures on the substrate by 126 K and 110 K, respectively. The TBC also significantly reduces stress concentrations and activated slip systems on the substrate, improving the thermomechanical performance of the vane.
Article
Thermodynamics
Zhixin Zhang, Wu Zeng, Xiaodong Zhang, Yuntao Zeng
Summary: As turbine inlet temperature increases, the use of thermal barrier coating (TBC) in turbine blades becomes more common. Evaluating the temperature distribution of the substrate metal is crucial during the design stage. Three different methods for modeling TBC in conjugate heat transfer simulation have been developed and used, but little research has been conducted on comparing their influence on the temperature distribution of turbine blades. This study analyzed and discussed the differences among the methods using different geometric models, showing that the methods have varying effects on temperature distribution depending on the specific application.
JOURNAL OF THERMAL SCIENCE
(2023)
Article
Metallurgy & Metallurgical Engineering
Ling-Yi Qian, Jing Wang, Yun-Shan Guo, He Liu, Ze-Bin Bao
Summary: The study aimed to investigate the effects of Ir and Pd additions on the oxidation behavior of PtAl coatings. Results showed that the Ir-modified PtAl coating exhibited better oxidation resistance than both Pd-modified and normal PtAl coatings, as Ir partly served as a diffusion barrier to reserve Al while Pd did not. This study provides important insights for the improvement of PtAl coatings.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Thermodynamics
Hwabhin Kwon, Jaehun Choi, Junseong Kim, Yeon-Gil Jung, SeungCheol Yang, Jaehyun Lee, Heesung Park
Summary: Film cooling and thermal barrier coatings are crucial for protecting high temperature gas turbines. The degradation of the coating at the vane surface after 24,000 equivalent operating hours has been examined. The microstructure analysis revealed a decrease in the thickness of the top coating and the growth of a thermally grown oxide layer at the interface between the coatings. Three-dimensional and numerical simulations showed that the degraded thermal barrier coating resulted in a 9.4% decrease in overall cooling effectiveness and a predicted temperature rise of 52.2 degrees C on the substrate.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Amarnath Kumar, Jenna Moledina, Yuan Liu, Kuiying Chen, Prakash C. Patnaik
Summary: The review provides a comprehensive overview of the progress in nanostructured thermal barrier coatings, focusing on microstructure, damage progression, and properties, with a particular emphasis on the comparative performance analysis between nanostructured and conventional 6-8 wt.% yttrium stabilized zirconia coatings.
Review
Materials Science, Multidisciplinary
Andy Nieto, Richa Agrawal, Luis Bravo, Clara Hofmeister-Mock, Marc Pepi, Anindya Ghoshal
Summary: This review critically examines the current understanding of CMAS degradation mechanisms and mitigation approaches, emphasizing the importance of designing materials approaches to mitigate CMAS attack and presenting key future research areas for 'sandphobic' thermal and environmental barrier systems.
INTERNATIONAL MATERIALS REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Fulei Jing, Junjie Yang, Shibai Tang, Quan Wen, Tao Zhang, Jian Wu, Xueling Fan
Summary: A quantitative characterization method of interface damage in thermal barrier coating based on uniaxial compression was proposed and verified by experiments. The critical compressive strain was found to effectively characterize the accumulation of interfacial damage caused by thermal oxidation and fatigue. The damage caused by thermal fatigue was greater than that caused by thermal oxidation, and the total damage in the coating could be divided into three parts: oxidatively driven damage, mechanically driven damage, and their interaction, with the interaction term being negative.
Article
Engineering, Aerospace
Yinfeng Liu, Soheil Jafari, Theoklis Nikolaidis
Summary: This paper introduces a new approach to optimize the fuel controller performance in Gas Turbine Engine by establishing a model and designing an objective function to adjust the optimal controller parameters.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Engineering, Aerospace
Yinfeng Liu, Soheil Jafari, Theoklis Nikolaidis
Summary: This paper applies the LLGA method to adjust the gains of the GTE controller, finding that the optimized gains are suitable for different flight conditions, improving engine performance in transient and high altitude conditions, but the optimization effect is not significant in other steady states.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Review
Automation & Control Systems
Seyed Jalal Mohammadi, Seyed Alireza Miran Fashandi, Soheil Jafari, Theoklis Nikolaidis
Summary: This review thoroughly investigates the development of gas turbine aero-engine control systems over the past eight decades and categorizes possible control strategies and concepts into four distinct phases. The benefits, historical coverage, and challenges of aircraft engine control systems are discussed comprehensively to provide researchers with a comprehensive reference for design and development.
MEASUREMENT & CONTROL
(2021)
Article
Energy & Fuels
Akshay Nag Srinath, Alvaro Pena Lopez, Seyed Alireza Miran Fashandi, Sylvain Lechat, Giampiero di Legge, Seyed Ali Nabavi, Theoklis Nikolaidis, Soheil Jafari
Summary: This study critically reviews and assesses the thermal management system architectures for hydrogen-powered propulsion technologies. The objectives are to identify system-level shortcomings and recognize remaining challenges and research questions. The study conducts a co-word analysis and historical review to identify milestones and proposed embodiments. Feasible architectures are classified and components discussed, with a specific focus on the application of hydrogen-powered fuel cells in aviation. The study also examines why no hydrogen-powered propulsion thermal management system architecture has been approved for commercial production and identifies remaining research challenges.
Review
Engineering, Aerospace
A. S. J. van Heerden, D. M. Judt, S. Jafari, C. P. Lawson, T. Nikolaidis, D. Bosak
Summary: The provision of adequate thermal management is becoming increasingly challenging due to the growth in heat loads, changing nature of heat sources, and inefficiency of composite materials. Key elements of thermal management systems include heat sources, heat acquisition mechanisms, thermal transport systems, heat rejection to sinks, and energy conversion and storage.(Addressing these challenges is crucial for improving aircraft performance and efficiency.)
PROGRESS IN AEROSPACE SCIENCES
(2022)
Article
Engineering, Aerospace
Shuwei Pang, Soheil Jafari, Theoklis Nikolaidis, Qiuhong Li
Summary: This paper proposes a novel direct thrust control approach based on an improved model predictive control method by reducing the dimension of control sequence. This control method can enhance thrust control accuracy and maximize thrust level within safe operation boundaries.
CHINESE JOURNAL OF AERONAUTICS
(2022)
Article
Energy & Fuels
Arnold Gad-Briggs, Emmanuel Osigwe, Soheil Jafari, Theoklis Nikolaidis
Summary: Hydrogen is seen as a significant fuel for future industrial processes due to its potential for zero emission. The UK considers hydrogen as a low-carbon solution for transitioning to net zero. This study investigates the performance parameters associated with nuclear power plants, working fluids, and control-system designs in supporting the conversion between electricity and hydrogen demand in a mini grid system. The results highlight the importance of high-technology heat exchangers and maintaining proper gas temperature for hydrogen production.
Article
Energy & Fuels
Yize Liu, Theoklis Nikolaidis, Seyed Hossein Madani, Mohammad Sarkandi, Abdelaziz Gamil, Muhamad Firdaus Sainal, Seyed Vahid Hosseini
Summary: A multi-fidelity micro combustor design approach is developed for a small-scale combined heat and power system. This approach combines 3D high-fidelity modeling and experimental testing to provide a comprehensive design solution. Rapid design exploration is achieved through reduced-order models, followed by high-fidelity modeling for detailed flow and emission physics. The designed combustor is successfully implemented in the system and verified against test data. Numerical analysis is conducted to assess the potential operation of biogas, and a strategy is proposed to address flame stabilization challenges.
Article
Thermodynamics
Zhiyuan Wei, Shuguang Zhang, Soheil Jafari, Theoklis Nikolaidis
Summary: The paper proposes a self-enhancing active transient protection (SeATP) control approach using model-based strategies for gas turbine aero-engines. Numerical simulations show that the SeATP controller can significantly improve thrust response for both new and degraded engines and has better robustness performance compared to the ATP controller.
Article
Mathematics
Majid Aghasharifian Esfahani, Mohammadmehdi Namazi, Theoklis Nikolaidis, Soheil Jafari
Summary: This paper proposes a novel control design procedure to improve FADEC systems and reduce emission levels in turbofan engines, in order to meet the Flightpath 2050 regulations.
Article
Engineering, Mechanical
Theoklis Nikolaidis, Alvise Pellegrini, Herbert I. H. Saravanamuttoo, Ioanna Aslanidou, Anestis Kalfas, Pericles Pilidis
Summary: This paper describes an investigation into the off-design performance comparison of single and two-shaft gas turbine engines. The results showed that the single-shaft engine had better thermal efficiency at part load compared to the two-shaft engine. The shape of the speed line, the level of component efficiencies, and their variations within the operating range had a significant impact on the performance of the gas turbine engines.
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2022)
Article
Thermodynamics
Yu-Zhi Chen, Elias Tsoutsanis, Chen Wang, Lin-Feng Gou
Summary: In recent years, there has been an increasing interest in gas turbine fault diagnosis, especially under dynamic conditions. This is due to the evolving operating profile of gas turbines and the need for efficient and accurate diagnostic solutions in real-time. The main challenges of fault diagnosis in real-time include power imbalance, heat soakage phenomenon, and sudden failures during transient operation. This study proposes a novel gas turbine diagnostic approach based on time-series measurements, which effectively quantifies the power balance and accurately diagnoses faults under both steady-state and transient conditions.
Article
Engineering, Marine
Amit Batra, Suresh Sampath, Theoklis Nikolaidis, Pericles Pilidis
Summary: The architecture of a ship propulsion system has a significant impact on the overall design and performance of the ship. This paper proposes a novel process for design space exploration using a model-based approach and multiple-criteria decision-making to select a compromise solution from competing propulsion system architectures. The process combines performance simulation data and expert opinions-based metrics for information not available early in the ship design process.
JOURNAL OF MARINE SCIENCE AND TECHNOLOGY
(2023)
Review
Engineering, Multidisciplinary
Ali Nekoonam, Reza Fatehi Nasab, Soheil Jafari, Theoklis Nikolaidis, Nader A. L. E. Ebrahim, Seyed Alireza Miran Fashandi
Summary: Evaluation of scientific journals has a significant impact on the future of scientific research by guiding institutes and countries to set appropriate goals and invest wisely. This article introduces a novel method combining co-word analysis and social network analysis to identify hot topics. By using three tools, HistCite, NodeXL, and VOSviewer, the analysis is conducted for six time periods.
TEHNICKI VJESNIK-TECHNICAL GAZETTE
(2023)
Article
Management
Mosab Alrashed, Theoklis Nikolaidis, Pericles Pilidis, Soheil Jafari, Wael Alrashed
Summary: This study introduces an enhancement valuation method to overcome challenges associated with TeDP in terms of technological, economic, and environmental impacts. Key result indicators and performance indicators for TeDP were identified and analysed to determine potential improvements in real-world efficiency. This research is the first to conduct a techno-economic environmental risk analysis based on the identified key indicators, providing valuable guidance for developers and researchers in the adoption of TeDP.
INTERNATIONAL JOURNAL OF PRODUCTIVITY AND PERFORMANCE MANAGEMENT
(2022)
