Article
Energy & Fuels
Yacine Rezgui
Summary: The study analytically investigated the effects of hydrogen addition on the combustion characteristics of a primary reference fuel in a Homogeneous Charge Compression Ignition engine. The results showed that hydrogen dilution effect had a positive impact on combustion characteristics, leading to higher engine thermal efficiency.
Article
Thermodynamics
Mohammad Alrbai, Sameer Al-Dahidi, Mosa Abusorra
Summary: Increasing the equivalence ratio above 0.25 significantly increases NOx emissions due to higher combustion peak bulk temperature, while CO and unburned hydrocarbons (HC) emissions decrease significantly at equivalence ratios above 0.25.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Mohammad Alrbai, Adnan Darwish Ahmad, Sameer Al-Dahidi, Ahmad M. Abubaker, Loiy Al-Ghussain, Ali Alahmer, Nelson K. Akafuah
Summary: This study investigates the feasibility of using raw biogas as the main fuel in HCCI engines and analyzes the effects of different trace elements on engine performance and emissions. Various models were used to simulate the HCCI process, including chemical kinetics, combustion, and heat transfer models. The study found that H2S and NH3 in the biogas mixture can increase power output but also increase SOx and NOx emissions. CO and H2O can reduce power output and NOx emissions, while intake temperature has a negative impact on engine efficiency and emissions. Increasing the compression ratio improves system efficiency, while EGR significantly reduces NOx emissions but also decreases performance. Evaluating the parameters' sensitivity, EGR is the most influential, while CR has the least impact.
Article
Thermodynamics
Kabbir Ali, Riffat Amna, Mohamed I. Hassan Ali
Summary: The objective of this paper is to investigate the use of H2/H2O2 fuel in a free carbon combustion engine for HCCI engine. The study analyzes Combustion phasing, IMEP, and thermal efficiency at different effective equivalence ratios and engine speeds. A 3D CFD model is developed and validated for controlling the combustion phasing of the HCCI engine by adjusting the volume fraction of H2O2 in the fuel mixture. The results show that H2O2 reduces inlet mixture temperature, improves combustion phasing, and enhances combustion and thermal efficiencies.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Moez Ben Houidi, Abdullah S. AlRamadan, Julien Sotton, Marc Bellenoue, S. Mani Sarathy, Bengt Johansson
Summary: The Homogeneous Charge Compression Ignition (HCCI) concept has great potential for improving engine efficiency and reducing pollutant emissions, but its application in Internal Combustion (IC) engines is limited to low speed and load conditions. By promoting moderate thermal and charge stratification, multi-stage ignition events can be achieved to reduce excessive Pressure Rise Rates (PRR).
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Energy & Fuels
Aneesh Vijay Kale, Anand Krishnasamy
Summary: Recent research has shown that homogeneous charge compression ignition (HCCI) engines can enhance traditional compression-ignition engines. Gasoline-like fuels with higher octane number and vapor pressure are better suited for port fuel-injected HCCI engines. By adding ignition promoters, intake charge preheating or turbocharging requirements can be eliminated, and cyclic variations in combustion can be reduced. Suitable diluents can prevent knocking and enable higher load extension. This study investigated various ignition promoters and diluents to achieve constant combustion phasing in gasoline-fueled HCCI combustion.
Article
Chemistry, Physical
Hrvoje Mikulcic, Jakov Baleta, Xuebin Wang, Jin Wang, Fengsheng Qi, Fan Wang
Summary: Ammonia combustion is a potential alternative fuel for hydrogen storage and engine use, with chemical mechanisms being crucial for minimizing harmful emissions. Further research is needed to study combustion kinetics, with the aim of applying insights to industrial burning systems. The study highlights the importance of accurate combustion chemistry modeling for improving emissions control in industrial applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Review
Engineering, Chemical
Liqiang Lu, Xi Gao, Jean-Francois Dietiker, Mehrdad Shahnam, William A. Rogers
Summary: Multi-scale computational fluid dynamics simulation plays a crucial role in biomass pyrolysis modeling, with the key being the coupling of sub-models at different scales. Recent progress includes detailed kinetics, efficient intra-particle models for thermally thick particles, hybrid drag models, convection heat transfer models, shape-resolved models, and machine learning derived models.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Energy & Fuels
Majid Haghshenas, Peetak Mitra, Niccolo Dal Santo, David P. Schmidt
Summary: The LIT methodology utilizes machine learning algorithms to accelerate combustion kinetics modeling in high-dimensional composition spaces, achieving good results through data clustering and localized DNN training. Clustering is performed using SOM, fully connected layer DNN models are optimized with Bayesian optimization, and a nonlinear transformation improves sensitivity to minor species, reducing prediction errors for ignition delay.
Article
Chemistry, Physical
Takumi Usui, Toshio Shudo
Summary: Improving thermal efficiency and reducing harmful exhaust gas emissions in internal combustion engines are important. This research proposes a hydrogen-fueled argon circulated closed cycle homogeneous charge compression ignition (HCCI) engine system and investigates the effects of in-cylinder gas initial temperature and residual water in recirculated gas on combustion characteristics. The results show that the system with argon circulation achieves higher thermal efficiency.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Thermodynamics
Aneesh Vasudev, Maciej Mikulski, Praveen Ramanujam Balakrishnan, Xiaoguo Storm, Jacek Hunicz
Summary: Many researchers believe multi-zone, chemical kinetics-based models are essential for development of low-temperature combustion engines. However, these models are not widely available and their assumptions vary, impacting their applicability. This study aims to overcome these barriers by providing a comprehensive review and detailed information to inspire improved multi-zone toolchains. It also presents a high-level vision of how multi-zone models can evolve.
PROGRESS IN ENERGY AND COMBUSTION SCIENCE
(2022)
Article
Energy & Fuels
Vincenzo De Bellis, Enrica Malfi, Alfredo Lanotte, Massimiliano De Felice, Luigi Teodosio, Fabio Bozza
Summary: A quasi-dimensional multi-zone HCCI model integrated with 1D commercial software is developed and validated in this work. The model uses the control mass Lagrangian approach and offline tabulation of chemical kinetics to predict mixture auto-ignition. It also includes sub-models for pollutant emissions estimation and has been shown to be a reliable tool for investigating HCCI engine operation and developing new engine architecture.
Article
Chemistry, Physical
Faisal Sultan, Muhammad Shahzad, Mehboob Ali, Anees Ur Rehman, Arshed Ali, Mohamed Altanji, Syed Inayat Ali Shah
Summary: This paper focuses on the participation of chemical species and the invariant region of the reaction mechanism, introducing a computational technique 'Spectral Quasi Equilibrium Manifold' (SQEM) for accurate grid points to achieve dimensional curves without compromising system accuracy.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Energy & Fuels
Peixin Zhao, Xiuxiu Sun, Xingyu Liang, Guoxi Jing, Teng Ma
Summary: A multi-component surrogate fuel was developed as an alternative to heavy fuel oil, with proportions determined based on the chemical and physical characteristics. The surrogate fuel was extensively validated and found to exhibit reliable overall performance for combustion behavior.
Article
Thermodynamics
A. Znidarcic, T. Katrasnik, I. G. Zsely, T. Nagy, T. Seljak
Summary: The study introduces an innovative approach to extend existing surrogate model methods for small-scale systems, incorporating simplified combustion kinetic mechanisms tailored to the specific thermodynamic conditions and surrogate compositions of sewage sludge combustion. This extension has been confirmed to offer an efficient tool for affordable and accurate design of small-scale combustion systems using fuels with complex compositions, maintaining accuracy and flexibility while reducing computational time.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
SeungHwan Keum, Pinaki Pal, Hong G. Im, Aristotelis Babajimopoulos, Dennis N. Assanis
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2016)
Article
Thermodynamics
Pinaki Pal, SeungHwan Keum, Hong G. Im
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2016)
Article
Engineering, Mechanical
Xiaofeng Yang, Seunghwan Keum, Tang-Wei Kuo
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2016)
Article
Thermodynamics
SeungHwan Keum, Hong G. Im, Dennis N. Assanis
COMBUSTION SCIENCE AND TECHNOLOGY
(2012)
Article
Thermodynamics
S. Keum, H. Park, A. Babajimopoulos, D. N. Assanis, D. Jung
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2011)
Article
Thermodynamics
Prashant Shrotriya, Robert Schiessl, Chunkan Yu, Viatcheslav Bykov, Thorsten Zirwes, Ulrich Maas
Summary: This research applies the reaction-diffusion manifold (REDIM) model reduction method to study partially-premixed flames (PPFs). The REDIM method allows for the evolution of a manifold according to diffusion-related information provided by the combustion system, without the need for prior identification of the type of combustion system. An iterative methodology is used to generate REDIM chemistry tables and converge the reduced manifold close to the detailed manifold. The results show that the REDIM reduced calculations can accurately predict temperature and mass fraction profiles of major and minor species in the final iteration steps.
COMBUSTION THEORY AND MODELLING
(2024)
Article
Thermodynamics
Mohammad Reza Salimi, Hadiseh Karimaei, Mostafa Gholampour Yazdi
Summary: In this study, the decomposition chamber of a monopropellant hydrazine thruster is numerically simulated, and the effects of parameters such as catalyst granule diameter, catalyst bed porosity coefficient, and inlet pressure on the performance are investigated. The results show that the porosity coefficient is the most influential parameter, and decreasing it improves the specific impulse and temperature while enhancing the thrust force and mass flow rate. The size of the catalyst granules and the inlet pressure also have an impact on the performance.
COMBUSTION THEORY AND MODELLING
(2024)
