Article
Thermodynamics
Jonathan Bonebrake, David L. Blunck
Summary: This study reveals that the turbulent flame speeds and tip stability of multi-component large hydrocarbon fuels can vary depending on the chemical composition. The jet fuel A2 (i.e. jet-A) exhibits higher turbulent flame speeds and better stability compared to other fuels, while the C1 fuel, consisting of heavily-branched alkanes, no aromatics, and relatively high average molecular weight, shows the slowest turbulent flame speeds and is most prone to tip quenching.
COMBUSTION SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Yeseul Park, Minsung Choi, Dongmin Kim, Joongsung Lee, Gyungmin Choi
Summary: This study investigates the impact of fuel exceeding the allowable Wobbe index range on gas turbine system performance through thermodynamic analysis. Different fuel compositions and diluent methods have varying effects on the operability and main parameters of each component.
Article
Thermodynamics
Swetaprovo Chaudhuri, Bruno Savard
Summary: Starting from an integral formulation of the average mass flow rate through a statistically planar, turbulent premixed flame consisting of isotherms, this study derives a scaling for the corresponding turbulent flame speed without invoking Damkiihler's hypotheses. Major approximations and interim results are validated using a Direct Numerical Simulation (DNS) dataset of n-heptane/air mixture with a large Karlovitz number and unity Lewis number, computed with reduced chemistry. A length scale quantifying the fluctuation distance of the isotherms within the premixed flame structure is analyzed.
COMBUSTION AND FLAME
(2023)
Article
Thermodynamics
Thorsten Zirwes, Feichi Zhang, Henning Bockhorn
Summary: In this study, a premixed and thermo-diffusively unstable turbulent hydrogen-air flame-in-a-box case is simulated using the flame particle tracking (FPT) method. The assessment of memory effects in local flame dynamics is the main focus. By tracking flame particles on an iso-surface of the flame during flame-turbulence interaction, the time history of flame speed and flame stretch can be recorded for each point on the flame iso-surface in a Lagrangian reference frame. The results reveal a time delay between the local flame speed and flame stretch signal, showing that previous values of flame stretch affect currently observed values of flame speed. The time delay can be quantified by choosing flame particles dominated by single frequencies.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Energy & Fuels
Mustafa Ilbas, Osman Kumuk, Serhat Karyeyen
Summary: The study investigated the impact of ammonia on gas turbine combustion performance, finding that ammonia-assisted kerosene fuels have potential in terms of combustion performance, but result in higher NOX emission levels.
Article
Energy & Fuels
Hong-meng Li, Guo-xiu Li, Guo-peng Zhang
Summary: Investigations were conducted on the flame self-similar propagation and flame acceleration characteristics of hydrogen-rich syngas turbulent expanding flames. The study found that the flame propagation speed and turbulent flame Reynolds number could be represented by power-law correlations. The increase in hydrogen fraction weakened the flame acceleration, while the decrease in equivalence ratio increased it due to the coupling between differential-diffusion and flame stretch.
Article
Thermodynamics
Seif Zitouni, Pierre Brequigny, Christine Mounaim-Rousselle
Summary: Ammonia shows promise as a hydrogen-energy carrier and carbon-free fuel, but there is limited research on ammonia combustion under turbulent conditions. This study examines the turbulent flame speeds of ammonia/air, ammonia/methane, and ammonia/hydrogen using a spherically expanding flame configuration. The results show that the flame propagation speed of ammonia/air increases exponentially with increasing hydrogen amount, and that the turbulent to laminar flame speed ratio increases with turbulence intensity. Flame morphology and stretch sensitivity analysis indicate that flame curvature remains relatively similar for pure ammonia and ammonia-based mixtures, and the wrinkling ratio increases with both increasing ammonia fraction and turbulent intensity.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Thermodynamics
Yunde Su, Seung Hyun Kim
Summary: The stretch effects in LES of a turbulent lean propane-air premixed Bunsen flame in the wrinkled flamelet regime are investigated. A simple approach to model the subgrid-scale flame stretch is proposed, which suggests using the volume-filtered strain rate on the unburned side of the filtered flame brush to approximate the surface-filtered strain rate. The study highlights the importance of mitigating the artificial heat release effects and examines the relative importance of curvature stretch and strain effects.
COMBUSTION SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Kevin Bioche, Laurent Bricteux, Andrea Bertolino, Alessandro Parente, Julien Blondeau
Summary: This article investigates the combustion characteristics of ammonia/hydrogen blends in a turbulent premixed burner, revealing a trade-off between NOX and NH3 emissions. Adjusting the hydrogen content can achieve flame propagation characteristics similar to a lean methane flame.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Yu Wang, Jianfeng Pan, Junfeng Wang, Qingbo Lu, Yangxian Liu, Evans K. Quaye
Summary: The study on micro combustors reveals the different flame regimes observed and the effects of combustor length and height variations on flame behaviors. Changes in combustor length have a significant impact on the extinction area of the flame, while alterations in combustor channel height lead to shifts in flame position and RERI flame propagation distance and frequency.
Article
Chemistry, Physical
Xin Liu, Michael Bertsch, Arman Ahamed Subash, Senbin Yu, Robert-Zoltan Szasz, Zhongshan Li, Per Petersson, Xue-Song Bai, Marcus Alden, Daniel Lorstad
Summary: Flame operability and flashback events of methane and hydrogen-enriched methane/air premixed flames in a gas turbine model combustor were investigated, revealing the influence of flame shape transition and flashback mechanisms.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Seongpil Joo, Sanghyeok Kwak, Min Chul Lee
Summary: This study investigates the dynamic response of flames with H-2 enriched CH4 fuels subjected to upstream mechanical perturbations in a model gas turbine combustor. The results show that the gain peaks of flame transfer function and cold-flow transfer function coincide with specific modulation frequencies of fuel velocity oscillations, and the phase of the transfer functions decreases with an increase in H-2 ratio.
Article
Green & Sustainable Science & Technology
Lauren N. Rupiper, Brent B. Skabelund, Rhushikesh Ghotkar, Ryan J. Milcarek
Summary: The study examines the performance of a flame-assisted fuel cell integrated with a gas turbine using six fuels, with hydrogen being the optimal choice for efficiency improvement. The hybrid system shows promise for enhancing efficiency in the growing aircraft industry, particularly with the increasing desire for more electric airplanes.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Chemistry, Physical
Guo-Peng Zhang, Guo-Xiu Li, Hong-Meng Li, Jian-Bin Cao
Summary: This study investigated the propagation of hydrogen-rich syngas premixed flame and found that the mixing process of turbulent flow and the stretching effect of the flame front significantly influenced its propagation speed. The effects of flame inherent instability, diffusional-thermal instability, and hydrodynamic instability on flame acceleration process were also observed. These findings are important for the development of hydrogen-rich syngas as an alternative energy source.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
M. Di Lorenzo, P. Brequigny, F. Foucher, C. Mounaim-Rousselle
Summary: The downsized spark ignition engine is a promising technology for reducing pollutants and greenhouse gas emissions by increasing the efficiency through boosting the intake air pressure. However, modeling the combustion process under drastic conditions of high pressure, high temperature, and high dilution rate remains challenging.
COMBUSTION AND FLAME
(2022)
Article
Optics
A. Denisov, G. Colmegna, P. Jansohn
APPLIED PHYSICS B-LASERS AND OPTICS
(2014)
Article
Engineering, Mechanical
Yu-Chun Lin, Salvatore Daniele, Peter Jansohn, Konstantinos Boulouchos
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2013)
Article
Mechanics
S. Daniele, J. Mantzaras, P. Jansohn, A. Denisov, K. Boulouchos
JOURNAL OF FLUID MECHANICS
(2013)
Article
Thermodynamics
D. Ebi, R. Bombach, P. Jansohn
Summary: Operating lean-premixed gas turbine burners with fuels containing large amounts of hydrogen can increase the risk of flame flashback. This study focuses on understanding the mechanisms and impact of flashback in methane-hydrogen air flames, and the findings suggest that the flame propagation pathway and flow-flame interaction for flashback are different compared to previous studies on swirl flames. High-speed imaging and laser diagnostics are used to characterize the flame behavior and flashback limits are measured at elevated pressure and preheat temperature to quantify the increase in flashback propensity with increased hydrogen content.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Engineering, Mechanical
Dominik Ebi, Peter Jansohn
Summary: Operating stationary gas turbines on hydrogen-rich fuels can significantly reduce greenhouse gas emissions in the power generation sector. Designing lean-premixed burners that are flexible in fuel composition must address the challenge of flame flashback. Systematic investigations on flashback at gas turbine relevant conditions are sparse, highlighting the need for further research in this area.
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2021)
Article
Energy & Fuels
Hossein Madi, Dmytro Lytvynenko, Tilman Schildhauer, Peter Jansohn
Summary: The ROBINSON project aims to overcome the limitations of islands in energy production and transportation through a flexible, self-sufficient, and environmentally friendly energy system. This article describes the feasibility of renewable electrification and heating system decarbonization in Eigeroy, Norway, using a mixed-integer linear programming framework for modeling. Various options, including onshore and offshore wind farms and utility-scale photovoltaic, were considered for generating renewable electricity. The heating system, consisting of a biomass gasifier and a combined heat and power system, was also analyzed, and the possibility of green hydrogen production was evaluated.
Proceedings Paper
Engineering, Mechanical
Julia Sedlmaier, Peter Habisreuther, Nikolaos Zarzalis, Peter Jansohn
PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2014, VOL 4A
(2014)
Proceedings Paper
Energy & Fuels
S. Daniele, P. Jansohn
PROCEEDINGS OF THE ASME TURBO EXPO 2012, VOL 2, PTS A AND B
(2012)
Article
Chemistry, Applied
D. Nicosia, M. Elsener, O. Kroecher, P. Jansohn
TOPICS IN CATALYSIS
(2007)
Article
Engineering, Mechanical
P. Griebel, E. Boschek, P. Jansohn
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2007)
Proceedings Paper
Engineering, Mechanical
E. Boschek, P. Griebel, P. Jansohn
PROCEEDINGS OF THE ASME TURBO EXPO, VOL 2
(2007)
Article
Engineering, Chemical
Adrian Schneider, John Mantzaras, Peter Jansohn
CHEMICAL ENGINEERING SCIENCE
(2006)
