Article
Thermodynamics
Seongsu Kim, Junghwan Kim
Summary: The transition from CNG to hydrogen has started in mass transportation in Seoul. This study explores the feasibility of using a hydrogen combustion engine for city buses and proposes a hydrogen-fueled, spark-ignition engine. Experiment and simulation are conducted to investigate the combustion characteristics, performance, and emissions. Real-time driving data and statistics of 373 bus routes in Seoul are analyzed. It is found that hydrogen-engine buses can be more efficient and a 20-Mpa fuel tank is sufficient for Seoul city buses.
Article
Chemistry, Physical
Tomasz Simla, Wieslaw Gazda, Wojciech Stanek
Summary: Renewable Energy Sources (RES) are an attractive way to save natural resources and improve the impact of power systems on the environment. The use of hydrogen as an energy carrier shows promise in integrating RES into the energy system. In this study, a simulation was conducted to evaluate the cooperation of a photovoltaic power plant with a hydrogen-fueled gas piston engine, with and without energy storage. The analysis aimed to assess compensation losses and the impact of hydrogen source on the overall ecological effectiveness of the system.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Tomasz Simla, Wieslaw Gazda, Wojciech Stanek
Summary: Renewable Energy Sources (RES) are an attractive way to save natural resources and improve the overall impact of power systems on the environment. This study focuses on the integration of RES with the energy system using hydrogen as an energy carrier. Through simulations, the analysis evaluates the compensation losses and storage losses, as well as the impact of the source of hydrogen on the overall ecological effectiveness of the system.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Shiquan Feng, Hongmei Zhang
Summary: A 3D model for fuel combustion in the cylinder was constructed based on the theory of dynamic adaptive chemistry and dynamic cell clustering. The study focused on developing a fast calculation algorithm to accelerate the engine combustion simulation and analyzing the impacts of dynamic adaptive chemistry and dynamic cell clustering on diesel engine simulation. The research found that appropriate error threshold values and initial search species are crucial for ensuring the accuracy of the simulation and meeting different research objectives. The study also highlighted the importance of selecting suitable cell clustering conditions to balance data accuracy and the prediction of pollutants.
Article
Engineering, Electrical & Electronic
Xiaoci Liang, Yiyang Luo, Yanli Pei, Mengye Wang, Chuan Liu
Summary: This study presents a concise model to describe the transient ion-dynamic capacitance in electrolyte-gated transistors and confirms the accuracy of the theory. Plasticity, high apparent mobility, sharp subthreshold swing, and memristive conductance can be achieved in a single transistor by appropriately programming the interfacial ion concentrations or matching the scan speed with ion motions. Multimode transistors with different capabilities were fabricated using common solid-state electrolyte films and were experimentally confirmed. It was also shown in software that these multimode devices could be used to create neural networks that can be switched between different types of artificial neural networks.
NATURE ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Dinghe Li, Hang Yuan, Shuo Ma, Jimeng Yang
Summary: In this study, an extended layerwise/solid-element (XLW/SE) method is developed for the thermo-chemo-mechanical (TCM) coupling problem of an aero-engine turbine blade with thermal barrier coatings (TBCs). The method utilizes the XLW method and the SE method to formulate the governing equations of TBCs and substrate, respectively. The dynamic responses of displacement, temperature, and concentration are calculated through time integration. The effectiveness of the proposed method is validated through comparison with a 3D elastic model generated by COMSOL.
Article
Nuclear Science & Technology
D. Martelli, R. Marinari, I. Di Piazza, P. Lorusso, M. Tarantino
Summary: This work presents experimental and numerical investigations on thermal hydraulic phenomena during hypothetical accidental scenarios in the lead-bismuth cooled fuel pin bundle simulator of the CIRCE facility. Four experiments were conducted to simulate the loss of heat sink and loss of flow accidents. Additionally, experiments were carried out to study heat transfer in the fuel pin simulator.
NUCLEAR ENGINEERING AND DESIGN
(2023)
Article
Chemistry, Physical
Zhipeng Sun, Yue Huang, Zhenye Luan, Sijia Gao, Yancheng You
Summary: Rotating detonation using ammonia as fuel shows promise as a carbon-free combustion technology for gas turbines. Three-dimensional simulations were conducted to investigate the detonation wave structure and flow field of a rotating detonation annular combustor with ammonia/hydrogen-air chemistry. The impact of equivalence ratios and hydrogen concentrations on detonation properties, propagation mode, combustor performance, and emission characteristics was studied. It was found that increasing combustor pressure and hydrogen concentration enhanced the chemical reaction rate and detonation wave velocity. Stable single-rotating waves were observed in ammonia/hydrogen combustor for a wide range of equivalence ratios when the hydrogen concentration was at least 0.2. The optimal cycle efficiency of the single rotating detonation was achieved at a critical hydrogen concentration of 0.3. NOx emissions were more dependent on equivalence ratios rather than hydrogen concentration in the range of 0.70 to 1.40.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Andrea Marinoni, Matteo Tamborski, Tarcisio Cerri, Gianluca Montenegro, Gianluca D'Errico, Angelo Onorati, Emanuele Piatti, Enrico Ernesto Pisoni
Summary: The study aims to introduce and validate a new transient simulation methodology of an ICE coupled to a hybrid architecture vehicle, using a 1D engine model and vehicle dynamics model within a Simulink environment. The approach aims to achieve real-time calculations for engine performance and emissions prediction in driving conditions.
APPLIED SCIENCES-BASEL
(2021)
Article
Thermodynamics
A. Babaei Zarch, K. Mazaheri
Summary: The non-linear unsteady thermal field of a standing wave thermoacoustic engine (SWTE) was investigated using a finite volume computational code in a two-dimensional domain. The interaction between temperature and pressure fields, especially close to and out of stack plates, was studied under different temperatures of the hot heat exchanger and constant temperature of the ambient heat exchanger. The results show non-harmonic patterns in extremum temperatures that deviate from linear thermoacoustic theory and the second law of thermodynamics.
APPLIED THERMAL ENGINEERING
(2023)
Article
Chemistry, Physical
Canberk Unal, Emin Acikkalp, Mustafa Tolga Balta, Arif Hepbasli
Summary: This study conducted a dynamic thermo-ecological cost assessment and performance analyses of a multi generation system using TRNSYS 18 software, considering outputs of electricity, clean water, heating, hydrogen, and cooling. A new index, TEC of irreversibility, was introduced and applied in the analysis. The study determined that the multigeneration system has an energy efficiency value of 0.43 and TECEL, TECHEAT, and TECH2 values of 2.98, 0.72 and 2.90 respectively.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Cheng Shi, Sen Chai, Liming Di, Changwei Ji, Yunshan Ge, Huaiyu Wang
Summary: Hydrogen fractions and equivalence ratios have been found to have significant effects on the combustion characteristics and operational stability of Wankel engines. Increasing hydrogen fraction leads to increased chamber pressure, shortened flame development and propagation periods, and reduced wall heat loss. Additionally, higher hydrogen content improves the stability of engine operations.
Article
Thermodynamics
Ayat Gharehghani, Mohammad Mahdi Salahi, Amin Mahmoudzadeh Andwari, Maciej Mikulski, Juho Konno
Summary: The addition of a small amount of ozone can improve the combustion characteristics of RCCI engines and expand their operating range.
Article
Physics, Fluids & Plasmas
Giuliano Benenti, Giulio Casati, Fabio Marchesoni, Jiao Wang
Summary: A dynamical model of a highly efficient heat engine is proposed, where an applied temperature difference maintains the motion of particles around a circuit consisting of two asymmetric narrow channels, in one of which the current flows against the applied thermodynamic forces. Numerical simulations and linear-response analysis suggest that, in the absence of frictional losses, the Carnot efficiency can be achieved in the thermodynamic limit.
Article
Energy & Fuels
Seunghyun Lee, Yongrae Kim, Jeongwoo Lee, Kiyeon Kim, Seungil Lee, Kyoungdoug Min, Sechul Oh
Summary: This study conducted experiments on a commercial automotive spark ignition engine and found that retarding ignition timing leads to an increase in exhaust exergy loss and a decrease in heat transfer exergy loss under the same excess air ratio. When considering different excess air ratios, the heat transfer exergy loss increased while the exhaust exergy loss decreased, and irreversibility was maintained at approximately 10%. The relationship between the thermo-mechanical exergy rise rate and the behavior of each exergy component was also examined.
Article
Thermodynamics
Fatemeh Salehi, Mohsen Talei, Evatt R. Hawkes, Chun Sang Yoo, Tommaso Lucchini, Gianluca D'Errico, Sanghoon Kook
FLOW TURBULENCE AND COMBUSTION
(2015)
Review
Thermodynamics
Ehsanallah Tahmasebi, Tommaso Lucchini, Gianluca D'Errico, Angelo Onorati, Giles Hardy
ENERGY CONVERSION AND MANAGEMENT
(2017)
Article
Thermodynamics
Tommaso Lucchini, Augusto Della Torre, Gianluca D'Errico, Angelo Onorati, Noud Maes, Lambertus M. T. Somers, Gilles Hardy
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2017)
Article
Thermodynamics
Achinta Varna, Armin Wehrfritz, Evatt R. Hawkes, Matthew J. Cleary, Tommaso Lucchini, Gianluca D'Errico, Sanghoon Kook, Qing N. Chan
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Energy & Fuels
Gilles Decan, Stijn Broekaert, Tommaso Lucchini, Gianluca D'Errico, Jan Vierendeels, Sebastian Verhelst
Article
Thermodynamics
Amin Maghbouli, Bersan Akkurt, Tommaso Lucchini, Gianluca D'Errico, Niels G. Deen, Bart Somers
COMBUSTION THEORY AND MODELLING
(2019)
Article
Energy & Fuels
T. Lucchini, A. Della Torre, G. D'Errico, A. Onorati
Article
Thermodynamics
Andrea Pati, Davide Paredi, Cooper Welch, Marius Schmidt, Christopher Geschwindner, Benjamin Bohm, Tommaso Lucchini, Gianluca D'Errico, Christian Hasse
Summary: This work investigated the spray injection phenomena in multi-hole, early direct-injection events in spark-ignition engines characterized by tumble flow charge motion. Experimental measurements and numerical simulations were conducted to assess the spray morphology and velocity fields. The results showed good agreement between experiments and simulations, indicating the influence of intake flow on spray asymmetry and penetration. A phenomenological model was introduced to describe the spray evolution.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2022)
Article
Thermodynamics
Matteo Tamborski, Gianluca D'Errico, Tommaso Lucchini, Angelo Onorati
Summary: This paper presents a novel quasi-dimensional model for simulating the combustion process in compression-ignition engines. The model discretizes the in-cylinder air-fuel mass into multiple zones and uses a one-dimensional control-volume-based spray approach for charge stratification. The model has been validated against experimental data and detailed CFD simulation results, and demonstrates accurate predictions of combustion phases and wall interaction.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2023)
Article
Energy & Fuels
Giovanni Gaetano Gianetti, Tommaso Lucchini, Gianluca D'Errico, Angelo Onorati, Patrik Soltic
Summary: In order to reduce pollutant and greenhouse gas emissions and improve thermal efficiency in spark-ignition (SI) engines, it is important to accurately describe the combustion phase. Computational fluid dynamics (CFD) can be used to study various phenomena, such as charge ignition, combustion development, and pollutant formation. This study validated a CFD methodology based on the flame area model (FAM) for modeling the combustion process in SI engines fueled with natural gas. The results showed that different piston bowl geometries did not significantly improve combustion efficiency.
Proceedings Paper
Thermodynamics
G. Gianettia, L. Sforza, T. Lucchini, G. D'Errico, P. Soltic, J. Rojewski, G. Hardy
ATI 2018 - 73RD CONFERENCE OF THE ITALIAN THERMAL MACHINES ENGINEERING ASSOCIATION
(2018)
Article
Transportation Science & Technology
Tommaso Lucchini, Gianluca D'Errico, Angelo Onorati, Alessio Frassoldati, Alessandro Stagni, Gilles Hardy
SAE INTERNATIONAL JOURNAL OF ENGINES
(2017)
Article
Transportation Science & Technology
Noud Maes, Nico Dam, Bart Somers, Tommaso Lucchini, Gianluca D'Errico, Gilles Hardy
SAE INTERNATIONAL JOURNAL OF FUELS AND LUBRICANTS
(2016)
Article
Thermodynamics
G. Montenegro, G. D'Errico, A. Della Torre, L. Cadei, S. Masi
JOURNAL OF APPLIED FLUID MECHANICS
(2016)
Proceedings Paper
Thermodynamics
Ehsanallah Tahmasebi, Tommaso Lucchini, Gianluca D'Errico, Angelo
70TH CONFERENCE OF THE ITALIAN THERMAL MACHINES ENGINEERING ASSOCIATION, ATI2015
(2015)