Blar i NTNU Open på forfatter "Løvås, Terese"
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Concept of hydrogen fired gas turbine cycle with exhaust gas recirculation: Assessment of combustion and emissions performance
Ditaranto, Mario; Li, Hailong; Løvås, Terese (Journal article; Peer reviewed, 2015)A novel gas turbine cycle concept applicable to power plants with pre-combustion CO2 capture or integrated gasification combined cycle (IGCC) is presented. These power plants use a hydrogen rich fuel with high reactive ... -
Correlation effects between turbulence and the conversion rate of pulverized char particles
Krüger, Jonas; Haugen, Nils Erland L; Løvås, Terese (Journal article; Peer reviewed, 2017)The effect of turbulence on heterogeneous reactions on the surface of char particles embedded in a turbulent oxidizer, consisting of oxygen and carbon-dioxide, is in this work studied numerically. It is shown that for a ... -
Curvature effects on NO formation in wrinkled laminar ammonia/hydrogen/nitrogen-air premixed flames
Netzer, Corinna; Ahmed, Ahfaz; Gruber, Andrea; Løvås, Terese (Peer reviewed; Journal article, 2021)The formation of nitrogen oxide (NO) in wrinkled laminar NH3/H2/N2-air premixed flames is investigated utilizing two-dimensional Direct Numerical Simulation (DNS) with detailed chemical kinetics as well as one-dimensional ... -
Detailed examination of the combustion of diesel and glycerol emulsions in a compression ignition engine
Emberson, David; Wyndorps, Jan; Ahmed, Ahfaz; Bjørgen, Karl Oskar Pires; Løvås, Terese (Peer reviewed; Journal article, 2021)This study examines glycerol as an additive to diesel fuel to demonstrate it has the potential to suppress the formation of soot/PM. The investigation of a diesel/glycerol emulsion included an engine trial, high-speed ... -
Detailed operational mapping of a grate fired Biomass combustion plant for improved combustion process control
Khalil, Roger Antoine; Malik, Azhar; Ku, Xiaoke; Skreiberg, Øyvind; Fossum, Morten; Becidan, Michael; Løvås, Terese (Journal article; Peer reviewed, 2016)Biomass combustion plants in Norway are facing stricter emission regulations and lower profitability, mostly due to low energy prices. Hence, performance optimization through improved combustion process control and/or ... -
Detailed Study of LED Diffuse Back Illumination for Soot Measurements in an Optical Combustion Chamber
Olsen, Mathias Solberg (Master thesis, 2017)An optical accessible compression ignition engine is under development at the engine suite at EPT, NTNU. The purpose of the new optical engine is to measure soot formation during the combustion process. In the search of ... -
Determination of zero dimensional, apparent devolatilization kinetics for biomass particles at suspension firing conditions
Espekvist, Anna; Li, Tian; Glarborg, Peter; Løvås, Terese; Jensen, Peter Arendt (Peer reviewed; Journal article, 2021)As part of the strive for a carbon neutral energy production, biomass combustion has been widely implemented in retrofitted coal burners. Modeling aids substantially in prediction of biomass flame behavior and thus in ... -
Development of an Experimental Setup for Ultrasound Aided Electrolysis of Liquid Ammonia
Anderson, Lasse Borg (Master thesis, 2021)Ammoniakk kan splittes og dermed forme en gass som inneholder ammoniakk, hydrogen og nitrogen. Denne gassen kan brukes som drivstoff, uten å lede til noe karbon-basert utslipp under forbrenning. I dette arbeidet er et ... -
Diffuse Back-Illuminated Extinction Imaging of Soot: Effects of Beam Steering and Flame Luminosity
Bjørgen, Karl Oskar Pires; Emberson, David; Løvås, Terese (Journal article; Peer reviewed, 2019)This study presents diagnostic development of diffuse backilluminated extinction imaging of soot. The method provides high temporal and spatial resolution of the line-of-sight optical density of soot (KL) in compression-ignited ... -
Dimensional Decomposition of Turbulent Reacting Flows
Grøvdal, Fredrik; Sannan, Sigurd; Meraner, Christoph; Li, Tian; Løvås, Terese (Peer reviewed; Journal article, 2020)A dimensional-decomposition approach, decomposing 3D into 3×1D for turbulent (reacting) flows are motivated, discussed and investigated. In the three-dimensional Linear Eddy Model (LEM3D), three orthogonally intersecting ... -
Direct Numerical Simulation of premixed ammonia/hydrogen flames: the effects of thermo-diffusive instabilities
Gaucherand, Jessica (Doctoral theses at NTNU;2023:377, Doctoral thesis, 2023)In order to phase out traditional fuel from the energy mix to reduce CO2 emissions and meet the large energy demand, the combustion of carbon-free fuels needs to be considered. This thesis investigates the combustion of ... -
DNS of acoustic Instabilities in low Emission Combustion Systems
Austarheim, Nikolai (Master thesis, 2013)In a state of the art gas turbine using Lean Pre-Mixed fuels one of the main challenges is efficient and reliable control of sound generated during combustion. Knowledge of sound generation in gas turbine combustion chambers ... -
Driftsstudie av Lav NOx brennerteknologi
Skarbø, Kjartan Juul (Master thesis, 2013)NOx dannelsen i forbrenning er en komplisert prosess. Den kan bli kategorisert i tre mekanismer; termisk NOx, hurtig NOx og NOx fra nitrogenforbindelser i drivstoffet. Betydning av mekanismene i denne rapporten er henholdsvis. ... -
The effect of turbulence on the conversion of coal under blast furnace raceway conditions
Wartha, Eva-Maria; Haugen, Nils Erland L; Karchniwy, Ewa Malgorzata; Bösenhofer, Markus; Harasek, Michael; Løvås, Terese (Peer reviewed; Journal article, 2022)dynamics (CFD) can be used to analyze the process virtually and thus improve its performance. Different reducing agents can be used to (partially) substitute the coke and consequently reduce overall emissions. To analyze ... -
Effects of scaling laws on the combustion and NOx characteristics of hydrogen burners
Meraner, Christoph; Li, Tian; Ditaranto, Mario; Løvås, Terese (Peer reviewed; Journal article, 2020)This paper proposes a novel bidirectional linkage between a long-term energy system model and an operational power market model. This combined modelling framework provides long-term energy system investment strategies that ... -
Effects of using ammonia as a primary fuel on engine performance and emissions in an ammonia/biodiesel dual-fuel CI engine
Nadimi, Ebrahim; Przybyła, Grzegorz; Emberson, David; Løvås, Terese; Ziółkowski, Łukasz; Adamczyk, Wojciech (Peer reviewed; Journal article, 2022)Ammonia is a promising alternative fuel that can replace current fossil fuels. Hydrogen carrier, zero carbon base emissions, liquid unlike hydrogen, and can be produced using renewable resources, making ammonia a future ... -
Emission characteristics of a novel low NOx burner fueled by hydrogen-rich mixtures with methane
Dutka, Marcin Damian; Ditaranto, Mario; Løvås, Terese (Journal article; Peer reviewed, 2015)The use of hydrogen-rich fuels may be challenging for burner designers due to unique properties of hydrogen compared to conventional fuels such as natural gas. Burner retrofit may be required to use hydrogen-enriched fuels ... -
Energy and Exergy Assessments of a Diesel-, Biodiesel-, and Ammonia-Fueled Compression Ignition Engine
Proniewicz, Mateusz; Petela, Karolina; Szlȩk, Andrzej; Przybyła, Grzegorz; Nadimi, Ebrahim; Ziółkowski, Łukasz; Løvås, Terese; Adamczyk, Wojciech (Peer reviewed; Journal article, 2023)The research is aimed at investigating ammonia in a compression ignition internal combustion engine as a promising alternative fuel towards decarbonization. This study presents energy and exergy assessments of a low-power ... -
Energy solutions for offshore platforms
Strøm, Kristian Aagaard (Master thesis, 2015)This report evaluates the different energy solutions available for operation of an offshore semi-submersible drilling- and accommodation rig today. The focus has been to map the technologies available considering fuel- and ... -
Eulerian-Lagrangian simulation of pulverized biomass jet using spheroidal particle approximation
Guo, Ning; Li, Tian; Zhao, Lihao; Løvås, Terese (Journal article; Peer reviewed, 2019)Pulverized biomass has great potential to replace coal in many industrial systems such as suspension-firing furnaces and entrained-flow gasifiers. The shape of pulverized biomass deviates significantly from the quasi-spherical ...