Fernando Veiga Lopez

Fernando Veiga Lopez
University Carlos III de Madrid | UC3M

Doctor of Engineering
Assistant professor at uc3m

About

39
Publications
4,604
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
139
Citations
Citations since 2017
39 Research Items
139 Citations
201720182019202020212022202301020304050
201720182019202020212022202301020304050
201720182019202020212022202301020304050
201720182019202020212022202301020304050
Introduction
Former researcher at uc3m (pre- and postdoc) and Institut Pprime/CNRS focusing on an experimental investigation of premixed gaseous flames propagation and stability in confined geometries, and numerical and theoretical analysis of detonations limits for safety applications, respectively; mostly working with hydrogen and biofuels. Currently working as an assistant professor at uc3m, keeping my research focus on the combustion of hydrogen for power and safety applications.
Additional affiliations
February 2022 - present
University Carlos III de Madrid
Position
  • Professor (Assistant)
February 2021 - January 2022
Institut Pprime
Position
  • Postdoc researcher
June 2020 - January 2021
University Carlos III de Madrid
Position
  • Postdoctoral researcher
Education
February 2017 - June 2020
University Carlos III de Madrid
Field of study
  • Fluid mechanics (combustion)
September 2014 - November 2016
Delft University of Technology
Field of study
  • Aerospace performance and propulsion
September 2010 - July 2014
Universidad Politécnica de Madrid
Field of study
  • Aeroespace propulsion engineering

Publications

Publications (39)
Article
Full-text available
The influence of low temperature chemistry (LTC) on the locus of steady solutions predicted by a ZND model with curvature losses and detailed kinetics was assessed using undiluted / CO2-diluted stoichiometric DME-O2 mixtures. Results show (i) the existence of an additional critical point at large velocity deficits when the LTC sub-mechanism is incl...
Article
Full-text available
Dendritic combustion in Hele-Shaw cells is investigated qualitatively using a simplified one-dimensional thermo-diffusive model. Formulae for the velocity, size and temperature of the flamelets are derived. The temperature and velocity of the flames increase for small radii to allow for their survival regardless the activation energy. In addition,...
Article
Full-text available
The influence of ozone on quasi-steady curved detonations was numerically studied in stoichiometric H 2-air and DME-O 2 (-CO 2) mixtures with 0%, 0.1% and 1% O 3 addition. Detonation speed-curvature (D-κ) relations were determined for both fuels. The H 2-air mixture has one critical point related to high-temperature chemistry whereas the DME-O 2 (-...
Article
Full-text available
The minimum detonation diameter for methane (CH4) / hydrogen (H2)-air mixtures is numerically evaluated to assess detonation risks in cooktops designed to work with natural gas. A one-dimensional mathematical model that considers heat and friction losses for detonations propagating in pipes is used for that purpose. The initial conditions are selec...
Article
Full-text available
We present here an experimental study of the influence of the aeroelastic coupling between the combustion chamber walls and the acoustic fluid field on the onset and development of thermoacoustic instabilities in stoichiometric propane-air premixed flames. A horizontal quasi-two-dimensional Hele-Shaw chamber formed by two parallel plates separated...
Conference Paper
Full-text available
The minimum detonation diameter for methane (CH4)/hydrogen (H2)-air mixtures is numerically evaluated to assess detonation risks in cooktops designed to work with natural gas. A one-dimensional mathematical model that considers heat and friction losses for detonations propagating in pipes is used for that purpose. The initial conditions are selecte...
Conference Paper
Full-text available
A methodology to develop more predictive simplified kinetic schemes (1-step/3-step chain branching) is presented in which D-k curves obtained with detailed kinetics are used as the fitting target aiming to capture the turning point of the curve kcrit. This was motivated by the similar trend observed between the kcrit values and the critical reacti...
Article
Full-text available
The problem of the steady propagation of detonation waves with friction losses is revisited including detailed kinetics. The derived formulation is used to study the influence of chemical modeling on the steady solutions and reaction zone structures obtained for stoichiometric hydrogen-oxygen. Detonation velocity-friction coefficient (D − c f) curv...
Preprint
Full-text available
An experimental study of methane, propane and dimethyl ether (DME) pre-mixed flames propagating in a quasi-two-dimensional Hele-Shaw cell placed horizontally is presented in this paper. The flames are ignited at the open end of the combustion chamber and propagate towards the closed end. Our experiments revealed two distinct propagation regimes dep...
Conference Paper
Full-text available
Flame propagation and acceleration in unobstructed channels/tubes is usually assumed as symmetric. A fully optically accessible narrow channel that allows to perform simultaneous high-speed schlieren visualization from two mutually perpendicular directions was built to asses the validity of the aforementioned assumption. Here, we provide experiment...
Conference Paper
Full-text available
Very lean hydrogen flames were thought to quench in narrow confined geometries. However, flames with very low fuel concentration undergo an isolated critically-sustained propagation in narrow gaps: H2-air flames can overcome large heat losses and very lean conditions by breaking the reaction surface into isolated flame cells that locally enrich the...
Article
In this paper, a theoretical analysis of the condensation of combustion products in narrow gaps between planar plates is performed. The investigation is motivated by the empirical results shown by Veiga-López [“Flame propagation in narrow channels,” Ph.D. thesis (Carlos III University of Madrid, 2020)] and the lack of a theoretical description dire...
Article
Full-text available
Thermoacoustic instabilities arise for lean hydrogen-air flames propagating in narrow channels. We provide here a detailed experimental analysis of such phenomena in a semi-confined vessel, analyzing the effect of the mixture composition, geometry and gravity on the onset of acoustic-driven flame vibrations. Downward-propagating flames leaner than...
Article
Very lean hydrogen flames were thought to quench in narrow confined geometries. We show for the first time how flames with very low fuel concentration undergo an unprecedented propagation in narrow gaps: H 2-air flames can survive very adverse conditions by breaking the reaction front into isolated flame cells that travel steadily in straight lines...
Article
The physical limits of the unconventional flame propagation regimes recently discovered [Veiga-Lopez et al., Phys. Rev. Lett. 124, 174501 (2020)] are analyzed. These regimes appear in combustible gaseous mixtures approaching the lean quenching limit of hydrogen-air flames in narrow gaps. They are characterized by a split of the flame front into a d...
Article
Full-text available
https://www.investigacionyciencia.es/revistas/investigacion-y-ciencia/grandes-hitos-y-prximos-retos-de-la-ciencia-811/la-sigilosa-combustin-del-hidrgeno-19140
Thesis
Full-text available
The sudden arrival of the climate change hurries fundamental research on a wide variety of topics trying to slow it down and counteract its effects. One of the examples is the study of alternative fuels (e.g., methane and hydrogen) to replace oil and coal. Furthermore, scientific investigation focusing on combustion in confined geometries is also i...
Article
Full-text available
Very lean hydrogen flames were thought to quench in narrow confined geometries. We show for the first time how flames with very low fuel concentration undergo an unprecedented propagation in narrow gaps: H2-air flames can survive very adverse conditions by breaking the reaction front into isolated flame cells that travel steadily in straight lines...
Conference Paper
Full-text available
A series of experiments on hydrogen flame propagation in a thin layer geometry is presented. Premixed hydrogen-air compositions in the range from 6 to 15%(vol.) H2 are tested. Semi-open vertical combustion chamber consists of two transparent Plexiglas side walls with main dimensions of 90x20 cm with a gap from 1 to 10 mm in between. Test mixtures a...
Article
Full-text available
The propagation of low-Lewis-number premixed flames is analyzed in a partially confined Hele–Shaw chamber formed by two parallel plates separated a distance h apart. An asymptotic-numerical study can be performed for small gaps compared to the flame thickness δT . In this narrow-channel limit, the problem formulation simplifies to a quasi-2D descri...
Article
Full-text available
This paper is associated with a video winner of a 2018 APS/DFD Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2018.GFM.V0018
Conference Paper
Full-text available
An experimental study of lean hydrogen-air premixed flames propagating in a confined combustion chamber is presented in this paper. Depending on the conditions (both equivalence ratio (Φ) and channel thickness (h) was varied), two different phenomena control the propagation of the flames. Primary and secondary thermoacoustic instabilities appear fo...
Poster
Full-text available
An experimental study of lean hydrogen-air premixed flames propagating in a confined combustion chamber ispresented in this poster. All the flames travel from the open end of the chamber towards its closed opposite side. Under such conditions, the interplay between heat losses and viscous friction determines the propagation of the flames. The teste...
Article
Full-text available
An experimental study of methane, propane and dimethyl ether (DME) pre-mixed flames propagating in a quasi-two-dimensional Hele-Shaw cell placed horizontally is presented in this paper. The flames are ignited at the open end of the combustion chamber and propagate towards the closed end. Our experiments revealed two distinct propagation regimes dep...
Presentation
2018 APS Gallery of Fluid Motion Milton van Dyke Award Winner
Presentation
Full-text available
Vessel-confinement contributions to thermo-acoustic instabilities of premixed flames
Conference Paper
Full-text available
Propagation of premixed flames in closed vessels is a problem of great importance in science and technological applications. The interaction of the acoustic waves with the reacting front is found widely in power-generation devices, which can compromise their structural integrity. A Hele Shaw cell, of very small thickness, has been used to study the...
Conference Paper
Full-text available
In this paper, an experimental study of methane-air and propane-air flames propagating in a quasi-two-dimensional, horizontal Hele-Shaw cell is presented. In the configuration considered in this paper, the reactive mixture is ignited at the open end of the combustion chamber and propagates towards the closed end. Our experiments revealed two distin...

Network

Cited By

Projects

Project (1)
Project
This project addresses fundamental questions related to the use of hydrogen and hydrogen-derived fuels by means of experimental, numerical and theoretical approaches. The main goal is to understand the particularities associated with the combustion of fuel blends and ultra-lean hydrogen fuels, when the combined effect of heat losses, acoustics and high mass diffusivity of hydrogen generates new combustion modes of high relevance for energy production and safety.