Article
Thermodynamics
Giulia Anna Maria Castorino, Lucrezia Manservigi, Silvio Barbarelli, Enzo Losi, Mauro Venturini
Summary: This paper presents a physics-based approach to predict the performance curves of PATs. The methodology includes a tuning procedure to calibrate the physics-based model on a given dataset of pumps/PATs, and a prediction procedure to estimate PAT performance curves for unknown PATs. The methodology is applied to six pumps/PATs, and a cross-validation process is used to validate the reliability of the prediction procedure. The results show that the predicted PAT performance curves have an acceptable deviation from the experimental curves, with average values ranging from 13.4% to 14.0% for head and power, and 12.4% for efficiency.
Article
Engineering, Chemical
Zheng Cao, Jianqiang Deng, Linkun Zhao, Lin Lu
Summary: The study focused on the flow characteristics of pumps and turbines by establishing a three-dimensional CFD model and a one-dimensional theoretical model of Pump as Turbine (PAT). The correlation between pressure and velocity was quantitatively investigated, and the performance of PAT was studied under various operating conditions. Results showed that the minimum SPV was obtained in the impeller, with an increase in flow rate leading to a generally higher SPV for PAT.
Article
Engineering, Marine
Zhuangzhuang Sun, Jie Yu, Fangping Tang
Summary: The study compared the hydraulic performance of a front-mounted bulb and a rear-mounted bulb scheme, finding that the efficiency of the rear-mounted scheme is higher than the front-mounted scheme under reasonable design of diffuser guide vanes. The positioning of the bulb affects flow conditions and hydraulic losses, with the rear-mounted bulb reducing losses by rectifying flow in the outlet channel. This research provides important reference for the design and selection of submersible tubular pump devices.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Faye Jin, Huanmao Wang, Yongyao Luo, Alexandre Presas, Huili Bi, Zhengwei Wang, Kai Lin, Xingchun Lei, Xiaolong Yang
Summary: In this study, the one-dimensional and three-dimensional coupled computational fluid dynamics (CFD) method was used to simulate the transient process of the turbine mode's starting up in the pump-turbine and identify the locations of flow energy dissipation (FED). The analysis revealed that the trailing edge of the guide vane consistently demonstrated high FED values, while wall shear stress, axial and radial forces had a significant effect on flow characteristics. Furthermore, high FED sites corresponded to high turbulence kinetic energy locations. Continuous wavelet transform (CWT) was applied to examine the time-frequency characteristics during this process.
Article
Engineering, Civil
Ali Foroudi, Kiyoumars Roushangar, Mojtaba Saneie, Fatemeh Vojoudi Mehrabani, Farhad Alizadeh
Summary: In this study, a 3D physical model based on the Germi-Chay dam was developed to assess the impact of downstream channel width variation on the efficiency of arched plan stepped spillways. The experiments showed that downstream channel width variations had no significant impact on the discharge coefficient in the submergence state, but resulted in a decrease in static pressure and influenced energy dissipation. The most efficient model was found to have a width ratio of 0.286.
WATER RESOURCES MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Kan Kan, Qingying Zhang, Yuan Zheng, Hui Xu, Zhe Xu, Jianwei Zhai, Alexis Muhirwa
Summary: Pump as turbine (PAT) is an alternative for electricity generation in areas with insufficient water flows. Recent studies have shown that the continuous operations of PAT lead to a deterioration of the inner surface smoothness, affecting its performance. The influence of wall roughness on PAT hydraulic performance has been studied and it was found that wall roughness gradually decreases the head, efficiency, and shaft power of PAT. However, the least impact was observed under best efficiency point conditions. Wall roughness also led to a decrease in axial velocity distribution uniformity and an increase in average swirl angle.
Article
Energy & Fuels
Xiaobang Bai, Junhu Yang, Xiaohui Wang, Jicheng Li
Summary: In this study, the three-dimensional flow field of a pump used as a hydraulic turbine was analyzed in a steady-state mode. The load distribution along three captured streamlines on both the pressure and suction surfaces was observed, and the relationship between the load distribution and the working capability was analyzed. The results showed that the load distribution on the pressure surface gradually transitioned from reverse S shape to S shape with increasing flow rate, while the load distribution on the suction surface increased with a concave trend.
FRONTIERS IN ENERGY RESEARCH
(2023)
Article
Engineering, Chemical
Hualin Yang, Lingli Zhu, Hao Xue, Junyong Duan, Fang Deng
Summary: This paper investigates the influence of structural optimization on the internal hydraulic performance of pump as turbine (PAT), using CFD method to analyze the effects of leading edge of centrifugal pump blade and fillet of impeller on turbine performance. The simulation results show that the inverted circular blade can improve the efficiency of PAT under various operating conditions.
Article
Thermodynamics
Ali Kandi, Mahdi Moghimi, Mojtaba Tahani, Shahram Derakhshan
Summary: The paper explores modifying pump selection criteria for running in turbine mode under variable head and discharge conditions, with a focus on improving existing performance indicators and introducing availability. The study looks at the impact of operating schemes on optimal pump specifications, considering capability, availability, and adaptability as effectiveness criteria.
Article
Energy & Fuels
Abdulbasit Nasir, Edessa Dribssa, Misrak Girma, Habtamu Bayera Madessa
Summary: This paper aims to develop a mathematical correlation model that can be used to select the optimal operation of a pump as a turbine for power-generating applications. The study demonstrates that the developed model is significant in the selection of pumps for power generation.
Article
Thermodynamics
Penglei Ma, Guijie Liu, Honghui Wang, Yong Wang, Yudong Xie
Summary: Turbines based on oscillating foils are more suitable for shallow waters due to their advantages. A hydraulic system designed for semi-passive oscillating foils was examined using co-simulations. The study found that mechanical parameters significantly impact heaving response and power output performance, with unstable heaving response decreasing energy harvesting efficiency.
Article
Engineering, Marine
Huifang Sun, Yue Lv, Jinbing Ni, Xianyu Jiang, Zhengwei Wang
Summary: Axial hydraulic thrust is an important factor affecting the safety and stability of pump turbine operation. Research has shown that the position of the labyrinth ring seal in the upper crown and lower ring has a significant impact on the efficiency of the unit.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Zhuodi Zhang, Xianghui Su, Yuzhen Jin, Zuchao Zhu, Tong Lin
Summary: This study proposes a new energy solution for the marine desulfurization tower, which can recover the energy consumption of the system, and analyzes the energy recovery capability and flow characteristics of the turbine. The results are of great significance for the design and optimization of turbines in the future.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Energy & Fuels
Egoi Ortego Sampedro, Antoine Dazin, Frederic Colas, Olivier Roussette, Olivier Coutier-Delgosha, Guy Caignaert
Summary: This study analyzed the experimental implementation of an air-water direct contact accumulation system and modeling of its multi-physic dynamic behavior. Two different real-time control strategies were proposed to deal with variable operating conditions and the global system efficiency was discussed. The efficiency control strategy achieved a 31% round trip efficiency, while the power control strategy led to 5% and 23% precision on exchanged power in charge and discharge modes respectively.
Article
Green & Sustainable Science & Technology
Jafar Nejadali
Summary: The paper analyzed and evaluated a novel PAT system for very low specific speeds, using a regenerative pump. Theoretical analysis and 3D numerical simulation were used to predict and validate the pump performance in reverse operation. Results showed that impeller blades had the most potential for energy losses according to the entropy generation method.
ENERGY FOR SUSTAINABLE DEVELOPMENT
(2021)
Article
Engineering, Mechanical
Enzo Losi, Mauro Venturini, Lucrezia Manservigi, Giuseppe Fabio Ceschini, Giovanni Bechini
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2019)
Article
Engineering, Mechanical
Lucrezia Manservigi, Mauro Venturini, Giuseppe Fabio Ceschini, Giovanni Bechini, Enzo Losi
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2020)
Article
Thermodynamics
Hilal Bahlawan, Witold-Roger Poganietz, Pier Ruggero Spina, Mauro Venturini
APPLIED THERMAL ENGINEERING
(2020)
Article
Energy & Fuels
Lucrezia Manservigi, Mattia Cattozzo, Pier Ruggero Spina, Mauro Venturini, Hilal Bahlawan
Article
Engineering, Mechanical
Enzo Losi, Mauro Venturini, Lucrezia Manservigi, Giuseppe Fabio Ceschini, Giovanni Bechini, Giuseppe Cota, Fabrizio Riguzzi
Summary: Gas turbine owners face challenges in the energy market, necessitating improved engine reliability and availability. Identifying trip symptoms, predicting occurrences, and reducing damage and costs are crucial. A methodology for classifying transients into clusters to identify event types is necessary for effective management and maintenance of gas turbines.
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Hilal Bahlawan, Agostino Gambarotta, Enzo Losi, Lucrezia Manservigi, Mirko Morini, Pier Ruggero Spina, Mauro Venturini
Summary: Hybrid energy plants, combining fossil fuel technologies and renewable energy systems, are a crucial step towards sustainable energy supply. By hybridizing renewable energy systems with gas turbines, acceptable compromise can be achieved for high efficiency and renewable energy integration. Electrical and thermal energy storage systems enhance plant flexibility and effectively manage energy production and demand variability.
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Marine
Francesco Arcigni, K. A. Abhinav, Maurizio Collu, Mauro Venturini
Summary: This study demonstrates that the thickness and roughness of marine growth significantly impact the loads and dynamic response of wind turbine structures, with changes in marine growth thickness leading to substantial differences in results. The study also shows that tower top displacement increases by 24% when marine growth thickness grows from 0 to 200 mm, while changes in the natural frequencies of the support structure with an increase in marine growth thickness are almost negligible (0.3%).
Article
Thermodynamics
Hilal Bahlawan, Mirko Morini, Michele Pinelli, Pier Ruggero Spina, Mauro Venturini
Summary: This paper explores the application of dynamic programming for optimizing the energy and economic scheduling of hybrid energy plants, including renewable energy systems, fossil fuel energy systems, and energy storage technologies. By considering the minimization of primary energy consumption or operational costs for optimal scheduling and meeting the thermal, cooling, and electrical energy demands of the user through hybrid scenarios, the validity and capability of this optimization methodology is demonstrated.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Hilal Bahlawan, Mirko Morini, Pier Ruggero Spina, Mauro Venturini
Summary: The design optimization methodology of distributed energy plants considers life cycle impacts to mitigate global energy consumption and carbon emissions. By scaling life cycle inventory data using scaling laws gathered from commercially available systems of various sizes, energy and environmental impacts can be quantified for optimal plant design. This approach demonstrates the effective design of a distributed energy plant and the economic assessment of different configurations, with potential for significant energy savings and cost reductions.
Article
Thermodynamics
Hilal Bahlawan, Mirko Morini, Michele Pinelli, Pier Ruggero Spina, Mauro Venturini
Summary: Multi-generation energy systems offer potential energy savings and cost reductions through comprehensive optimization, which outperforms commonly used algorithms and provides an efficient and flexible framework for their design and operation.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Automation & Control Systems
Lucrezia Manservigi, Daniel Murray, Javier Artal de la Iglesia, Giuseppe Fabio Ceschini, Giovanni Bechini, Enzo Losi, Mauro Venturini
Summary: This study investigates the capability of four Support Vector Machine approaches to detect Unit of Measure Inconsistency (UMI) in the field of gas turbine diagnostics. With the use of real-world dataset, the results demonstrate that the Radial Basis Function with One-vs-One decomposition achieves higher diagnostic accuracy.
Article
Engineering, Electrical & Electronic
Lucrezia Manservigi, Mauro Venturini, Enzo Losi, Giovanni Bechini, Javier Artal de la Iglesia
Summary: This paper investigates the detection of unit of measure inconsistencies (UMIs) in gas turbine data and tests the performance of three supervised machine learning classifiers using an experimental dataset. The results show that Naive Bayes is the optimal classifier for UMI detection.
Proceedings Paper
Automation & Control Systems
Saverio Farsoni, Silvio Simani, Stefano Alvisi, Mauro Venturini
Summary: The paper discusses effective methods for converting wind and hydro energy sources using control techniques, proposing that design solutions based on fuzzy models can manage the nonlinear dynamic processes in these energy conversion systems. Furthermore, the control design solutions are able to consider different working conditions and ensure reliability and robustness features.
5TH CONFERENCE ON CONTROL AND FAULT-TOLERANT SYSTEMS (SYSTOL 2021)
(2021)
Proceedings Paper
Computer Science, Artificial Intelligence
Silvio Simani, Stefano Alvisi, Mauro Venturini
INTELLIGENT SYSTEMS AND APPLICATIONS, VOL 1
(2020)
Proceedings Paper
Energy & Fuels
George J. Orme, Mauro Venturini
PROCEEDINGS OF THE ASME TURBO EXPO: TURBOMACHINERY TECHNICAL CONFERENCE AND EXPOSITION, 2019, VOL 9
(2019)