Browsing by Subject "Combustion"

Now showing items 21-39 of 39

    • Influence of axial air injection on the flame stability of a technically premixed hydrogen flame 

      Mira Martínez, Daniel; Both, Ambrus; Surapaneni, Anurag (Global Power and Propulsion Society (GPPS), 2022)
      Conference report
      Open Access
      This work is a numerical investigation on the stability of a hydrogen flame in a swirl-stabilized burner configuration using large-eddy simulation with tabulated chemistry. Experimental results from this combustor showed ...

    • Large-eddy simulation of ow and combustion dynamics in a lean partially premixed swirling combustor 

      Li, Shaoshuai; Zheng, Yunzhe; Zhu, Min; Mira, Daniel; Jiang, Xi (Elsevier, 2015-11-06)
      Article
      Open Access
      A lean partially premixed swirling combustor was studied by resolving the complete flow path from the swirl vanes to the chamber outlet with large-eddy simulation (LES). The flow and combustion dynamics for non-reacting ...

    • Low Mach Navier-Stokes equations on unstructured meshes 

      Ventosa Molina, Jordi; Chiva Segura, Jorge; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2012)
      Conference report
      Restricted access - publisher's policy
      Numerical methods for fluxes with strong density variations but with speeds much lower than the sound speed, known as low Mach flows, present some particularities with respect to incompressible formulations. Despite ...

    • Low order modeling of thermoacoustic instabilities 

      Fargas Cañas, Marina (Universitat Politècnica de Catalunya, 2022-01-26)
      Master thesis
      Restricted access - author's decision
      Pollution and The Greenhouse Effect are a concern in our society. The high levels of CO2, NOx, ozone, and methane gasses are alarming and have pushed gas turbine industries to develop more environmentally friendly combustors. ...

    • Low-dissipation finite element strategy for low Mach number reacting flows 

      Both, Ambrus; Lehmkuhl Barba, Oriol; Mira Martínez, Daniel; Ortega, Marc (Elsevier, 2020-03-30)
      Article
      Open Access
      The present paper extends the conservative finite element convective scheme proposed by Charnyi et al.(Journal of Computational Physics 337, 2017, 289–308) originally formulated for incompressible flows to the low Mach ...

    • Magnetic separation of ilmenite used as an oxygen carrier in fluidized bed combustion 

      Lamarca Barba, Ignacio (Universitat Politècnica de Catalunya, 2021-07-01)
      Bachelor thesis
      Open Access
      Covenantee:   Chalmers tekniska högskola
      This bachelor thesis studies how oxidation and reduction cycles during oxygen carrier aided combustion (OCAC) operation, as well as ash interaction, affect the magnetic susceptibility of ilmenite particles used as oxygen ...

    • Motor tèrmic Berdrod 

      Bernet Duque, Marc-Teodor (Universitat Politècnica de Catalunya, 2019-07)
      Bachelor thesis
      Open Access
      Estudi de la viabilitat d’una variant del motor de combustió interna alternatiu de quatre temps destinat a vehicles, principalment motocicletes, que combina la adequació metamòrfica de la funcionalitat dels elements que ...

    • Nanofaceted PdO sites in PdCe surface superstructures: enhanced activity in catalytic combustion of methane 

      Colussi, Sara; Gayen, Arup; Farnesi Camellone, Matteo; Boaro, Marta; Llorca Piqué, Jordi; Fabris, Stefano; Trobarelli, Alessandro (2009-10)
      Article
      Restricted access - publisher's policy
      An open superstructure: A Pd/CeO2 catalyst prepared by solution combustion synthesis is three to five times more active for CH4 combustion than the best conventional palladium-based systems. The catalyst contains an ordered, ...

    • Numerical characterization of a technically premixed hydrogen flame under conditions close to flashback 

      Mira Martínez, Daniel; Lehmkuhl Barba, Oriol; Both, Ambrus; Stathopoulos, Panagiotis; Tanneberger, Tom; Reichel, Thoralf G.; Paschereit, Christian Oliver; Vázquez, Mariano; Houzeaux, Guillaume (Springer, 2020-03)
      Article
      Open Access
      This work presents a numerical study of a technically premixed swirling combustor with central air injection at conditions close to flashback using large-eddy simulation with flamelet modelling. This burner has the ...

    • Numerical investigation of unsteady processes in combustion using flame transfer function 

      Koumides, Phivos Andreou; Mira, Daniel; Pérez-Sánchez, Eduardo J. (Barcelona Supercomputing Center, 2022-05)
      Conference report
      Open Access
      Hydrogen has been recognized as a clean and sustainable energy carrier to help deliver significant emission reductions and is regarded as an accelerator in achieving a low carbon future. One of the main limitations of the ...

    • Numerical Resolution of Fluid Dynamics and Heat and Mass Transfer problems. Application to Combustion Processes 

      Veiga Fernández, David (Universitat Politècnica de Catalunya, 2020-06-30)
      Master thesis
      Open Access
      Covenantee:   Institut polytecnique des sciences avancées
      The study and optimization of Combustion processes has transcended the engineering necessity to become an environmental concern. Recent regulations implement growing restrictions on emissions produced in industries that ...

    • Optimization of the progress variable definition using a genetic algorithm for the combustion of complex fuels 

      Both, Ambrus; Mira Martínez, Daniel; Lehmkuhl Barba, Oriol (MCM, 2021)
      Conference lecture
      Open Access
      In this work counterflow diffusion flamelets of n-heptane and air are used at stable and unsteady extinguishing conditions for building a thermo-chemical database for Computational Fluid Dynamics (CFD) calculations. The ...

    • Origin of high activity and selectivity of CuO/CeO2 catalysts prepared by solution combustion synthesis in CO-PROX reaction 

      Barbato, P.S.; Colussi, Sara; Di Benedetto, A.; Landi, Giada; Lisi, L.; Llorca Piqué, Jordi; Trovarelli, Alessandro (2016-06-23)
      Article
      Restricted access - publisher's policy
      A CuO/CeO2 catalyst with 4 wt % CuO nominal content has been prepared by solution combustion synthesis (SCS) and characterized by ICP-MS, BET surface area analysis, XPS, HRTEM, and H-2, and/or CO TPR. The catalyst, showing ...

    • Semi implicit solver for high fidelity LES/DNS solutions of reacting flows 

      Surapaneni, Anurag; Mira Martínez, Daniel (MCM, 2021)
      Conference lecture
      Open Access
      A semi-implicit/point-implicit stiff solver (ODEPIM) for integrating chemistry in context of high fidelity LES/DNS simulations is presented. A detailed overview of the algorithm and its numerical formulation is discussed. ...

    • Shape-dependent activity of ceria in soot combustion 

      Aneggi, Eleonora; Wiater, Dawid; de Leitenburg, Carla; Llorca Piqué, Jordi; Trovarelli, Alessandro (2014-01)
      Article
      Restricted access - publisher's policy
      In this study, a series of conventional polycrystalline ceria and single-crystalline ceria nanorods and nanocubes were prepared by hydrothermal methods, and their structural, redo; and morphological properties were ...

    • Simultaneous removal of soot and NOx, over K- and Ba-doped ruthenium supported catalysts 

      Matarrese, Roberto; Aneggi, Eleonora; Castoldi, Lidia; Llorca Piqué, Jordi; Trovarelli, Alessandro; Lietti, Luca (2016-06-01)
      Article
      Open Access
      Ruthenium-based materials are investigated for the simultaneous removal of soot and NOx and their behavior is compared with that of model Pt-Ba/Al2O3 and Pt-K/Al2O3 catalysts.; The materials, 1%wt Ru-10%wt AM/MO (AM = Ba ...

    • Single step combustion synthesized Cu/Ce0.8Zr0.2O2 for methanol steam reforming: Structural insights from in situ XPS and HRTEM studies 

      Das, Dipak; Llorca Piqué, Jordi; Domínguez Escalante, Montserrat; Gayen, Arup (2015-11-02)
      Article
      Open Access
      Single step combustion synthesized Cu (5–15 at.-%)/Ce0.8Zr0.2O2 materials containing highly dispersed copper have been assessed for methanol steam reforming (MSR). The activity patterns suggest Cu (10 at.-%)/Ce0.80Zr0.20O2 ...

    • Temperature dependence of density and viscosity of vegetable oils 

      Esteban Dalmau, Bernat; Riba Ruiz, Jordi-Roger; Baquero Armans, Grau; Rius Carrasco, Antoni; Puig Vidal, Rita (2012-07)
      Article
      Open Access
      The straight use of vegetable oils as fuel in diesel engines entails adjusting several physical properties such as density and viscosity. By adequately heating the vegetable oil before entering the injection system, its ...

    • The Oxy-Fuel Burner: emissions and stability analysis 

      Fuentes Lejarza, Gorka (Universitat Politècnica de Catalunya / University of California, Irvine, 2014)
      Bachelor thesis
      Open Access