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Otxoterena Af Drake, PaulORCID iD iconorcid.org/0000-0002-4687-9554
Alternativa namn
Publikasjoner (10 av 31) Visa alla publikasjoner
Correa, A., Otxoterena Af Drake, P. & Försth, M. (2024). Calculating gas emissivities using HITEMP, and engineering approximations of the results. In: BOOK OF ABSTRACTS Nordic Fire & Safety: . Paper presented at Nordic Fire & Safety Days 2024 in Lund, Sweden. 18-19 June, 2024 (pp. 125). RISE Research Institutes of Sweden
Åpne denne publikasjonen i ny fane eller vindu >>Calculating gas emissivities using HITEMP, and engineering approximations of the results
2024 (engelsk)Inngår i: BOOK OF ABSTRACTS Nordic Fire & Safety, RISE Research Institutes of Sweden , 2024, s. 125-Konferansepaper, Oral presentation with published abstract (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
RISE Research Institutes of Sweden, 2024
Serie
RISE Rapport ; 2024:49
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-73664 (URN)10.23699/yns7-3n56 (DOI)978-91-89971-08-0 (ISBN)
Konferanse
Nordic Fire & Safety Days 2024 in Lund, Sweden. 18-19 June, 2024
Tilgjengelig fra: 2024-06-24 Laget: 2024-06-24 Sist oppdatert: 2024-06-24bibliografisk kontrollert
Otxoterena Af Drake, P. & Försth, M. (2024). Measurements of droplet size and velocity for three selected nozzles.
Åpne denne publikasjonen i ny fane eller vindu >>Measurements of droplet size and velocity for three selected nozzles
2024 (engelsk)Rapport (Annet vitenskapelig)
Abstract [en]

Sprays produced by injecting water into quiescent air by three different types of nozzles were characterised by optical methods. The droplet velocities and droplet size distributions were assessed by the use of high speed shadowgraphs.

Serie
RISE Rapport ; 2024:25
Emneord
water spray, droplet size, velocity
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-72330 (URN)978-91-89896-73-4 (ISBN)
Forskningsfinansiär
Swedish Research Council Formas, 2019-00521
Tilgjengelig fra: 2024-03-15 Laget: 2024-03-15 Sist oppdatert: 2024-03-28bibliografisk kontrollert
Dominguez, A., Borggren, J., Xu, C., Otxoterena, P., Försth, M., Leffler, T. & Bood, J. (2023). A compact Scheimpflug lidar imaging instrument for industrial diagnostics of flames. Measurement science and technology, 34(7), Article ID 075901.
Åpne denne publikasjonen i ny fane eller vindu >>A compact Scheimpflug lidar imaging instrument for industrial diagnostics of flames
Vise andre…
2023 (engelsk)Inngår i: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 34, nr 7, artikkel-id 075901Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Scheimpflug lidar is a compact alternative to traditional lidar setups. With Scheimpflug lidar it is possible to make continuous range-resolved measurements. In this study we investigate the feasibility of a Scheimpflug lidar instrument for remote sensing in pool flames, which are characterized by strong particle scattering, large temperature gradients, and substantial fluctuations in particle distribution due to turbulence. An extinction coefficient can be extracted using the information about the transmitted laser power and the spatial extent of the flame. The transmitted laser power is manifested by the intensity of the ‘echo’ from a hard-target termination of the beam located behind the flame, while the information of the spatial extent of the flame along the laser beam is provided by the range-resolved scattering signal. Measurements were performed in heptane and diesel flames, respectively. © 2023 The Author(s). 

sted, utgiver, år, opplag, sider
Institute of Physics, 2023
Emneord
combustion, lidar, real-time monitoring, Laser beams, Remote sensing, Extinction coefficients, Imaging instruments, Laser power, Particle scattering, Particles distribution, Pool flames, Real time monitoring, Remote-sensing, Scheimpflug, Spatial extent, Optical radar
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-64308 (URN)10.1088/1361-6501/acc268 (DOI)2-s2.0-85151560787 (Scopus ID)
Merknad

Funding details: Stiftelsen för Strategisk Forskning, SSF, TM17-0309; Funding details: VINNOVA, 2018-01551; Funding text 1: This project was supported by research Grants from Swedish Governmental Agency for Innovation Systems, Vinnova (Smartare Elektroniksystem, Project Number 2018-01551) and the Swedish Foundation for Strategic Research (SSF) through Project Number TM17-0309.

Tilgjengelig fra: 2023-04-25 Laget: 2023-04-25 Sist oppdatert: 2023-06-05bibliografisk kontrollert
Berard, L., Otxoterena Af Drake, P. & Dederichs, A. (2023). Compounds Produced by the Pyrolysis of Powders and Dusts Present in the Alimentary Industry. Combustion Science and Technology, 195(3), 419
Åpne denne publikasjonen i ny fane eller vindu >>Compounds Produced by the Pyrolysis of Powders and Dusts Present in the Alimentary Industry
2023 (engelsk)Inngår i: Combustion Science and Technology, ISSN 0010-2202, E-ISSN 1563-521X, Vol. 195, nr 3, s. 419-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Under certain conditions dust explosions occur in the alimentary industry. Following ATEX and other guidelines have not eliminated accidents. Therefore, more knowledge is needed. The current work delivers experimental results describing phase transitions and decomposition of dusts. Dusts from wheat flour, chili powder, corn starch, milk powder, cocoa powder, and by-product of grain are investigated. The temperature of pyrolisation has been identified using TGA to be in the range [250°C, 600°C] in air and [300°C, 450°C] in nitrogen. It was found that the compositions of the pyrolysis gases depend on temperature. Carbon monoxide, carbon dioxide, methane, and hydrogen were the main contributors to the pyrolysis gases. The distributions are described with a polynomial or Gaussian fit. The current paper proposes coefficients for Gaussian polynomials expressing the concentration for the four primary pyrolysis gases. 

sted, utgiver, år, opplag, sider
Taylor and Francis Ltd., 2023
Emneord
biomass, combustion, Dust, explosion, Pysolysis, Carbon dioxide, Carbon monoxide, Dairies, Pyrolysis, Cocoa powder, Corn starch, Dust explosion, Gaussian fits, Gaussian polynomials, Milk powder, Wheat flours
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-56018 (URN)10.1080/00102202.2021.1956911 (DOI)2-s2.0-85112316574 (Scopus ID)
Tilgjengelig fra: 2021-08-30 Laget: 2021-08-30 Sist oppdatert: 2023-06-05bibliografisk kontrollert
Sjöström, J., Försth, M., Otxoterena Af Drake, P. & Svensson, R. (2022). Ignition of natural fuels from strikes between steel and rocks.
Åpne denne publikasjonen i ny fane eller vindu >>Ignition of natural fuels from strikes between steel and rocks
2022 (engelsk)Rapport (Annet vitenskapelig)
Abstract [en]

The ignition of natural fuels by sparks from strikes between metals and hard rock is far from understood and the ignition potential of sparks from rock strikes during heavy machinery operations is disputed in the scientific literature. This study utilises a spectrally resolved technique to study the temperature evolution of metal sparks from rock strikes. The study shows that initial temperature after collision can easily reach 1500 °C and this temperature can increase additionally by several hundred degrees as rapid oxidation processes are initiated, often leading to further disintegration of the fragment. The average temperature of fragments from such collisions is here measured to 1400 – 2000 °C and the combination of temperature, size and exothermic processes makes them viable for forest litter igniting. However, ignition on forest lands is always an unlikely, although possible outcome of heavy machinery operations and should be considered in risk assessment of the activity.

Publisher
s. 54
Serie
RISE Rapport ; 2022:22
Emneord
Ignition, sparks, stone, metal, forestry, wildfire
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-62355 (URN)978-91-89561-39-7 (ISBN)
Tilgjengelig fra: 2023-01-03 Laget: 2023-01-03 Sist oppdatert: 2023-06-05bibliografisk kontrollert
Otxoterena Af Drake, P., Andersson, S. & Andersson, M. (2022). Two Dimensional Measurements of Soot Size and Concentration in Diesel Flames by Laser Based Optical Methods. In: SAE Technical Paper Issue 202229 March 2022: . Paper presented at SAE 2022 Annual World Congress Experience, WCX 2022, 5 April 2022 through 7 April 2022. SAE International (2022)
Åpne denne publikasjonen i ny fane eller vindu >>Two Dimensional Measurements of Soot Size and Concentration in Diesel Flames by Laser Based Optical Methods
2022 (engelsk)Inngår i: SAE Technical Paper Issue 202229 March 2022, SAE International , 2022, nr 2022Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Soot particle size, particle concentration and volume fraction were measured by laser based methods in optically dense, highly turbulent combusting diesel sprays under engine-like conditions. Experiments were done in the Chalmers High Pressure, High Temperature spray rig under isobaric conditions and combusting commercial diesel fuel. Laser Induced Incandescence (LII), Elastic Scattering and Light Extinction were combined quasi-simultaneously to quantify particle characteristics spatially resolved in the middle plane of a combusting spray at two instants after the start of combustion. The influence that fuel injection pressure, gas temperature and gas pressure exert on particle size, particle concentration and volume fraction were studied. Probability density functions of particle size and two-dimensional images of particle diameter, particle concentration and volume fraction concerning instantaneous single-shot cases and average measurements are presented. High injection pressure led to a reduction in the mean particle size, total number of particles and total amount of soot compared to a low injection pressure. Higher gas pressure resulted in larger amount of soot and larger soot particle size, with higher gas temperature having similar effects. 

sted, utgiver, år, opplag, sider
SAE International, 2022
Emneord
Diesel engines, Dust, Light extinction, Probability density function, Soot, Volume fraction, Diesel flame, Laser-based, Laser-based methods, Measurements of, Optical methods, Particle volume, Particles concentration, Particles sizes, Soot particles, Two-dimensional measurement, Particle size
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-59236 (URN)10.4271/2022-01-0416 (DOI)2-s2.0-85128052997 (Scopus ID)
Konferanse
SAE 2022 Annual World Congress Experience, WCX 2022, 5 April 2022 through 7 April 2022
Merknad

Funding details: Canada Excellence Research Chairs, Government of Canada, CERC; Funding text 1: The authors acknowledge the financial support of CERC (Combustion Engine Research Centre) at Chalmers and its member companies.

Tilgjengelig fra: 2022-06-13 Laget: 2022-06-13 Sist oppdatert: 2023-06-05bibliografisk kontrollert
Otxoterena Af Drake, P., Willstrand, O., Andersson, A. & Biswanger, H. (2021). Physical characteristics of splash and spray clouds produced by heavy vehicles (trucks and lorries) driven on wet asphalt. Journal of Wind Engineering and Industrial Aerodynamics, 217, Article ID 104734.
Åpne denne publikasjonen i ny fane eller vindu >>Physical characteristics of splash and spray clouds produced by heavy vehicles (trucks and lorries) driven on wet asphalt
2021 (engelsk)Inngår i: Journal of Wind Engineering and Industrial Aerodynamics, ISSN 0167-6105, E-ISSN 1872-8197, Vol. 217, artikkel-id 104734Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Heavy vehicles rolling on wet roads produce splash and spray clouds. These aerosols reduce the visibility of other drivers, contribute to a small, but quantifiable proportion of road traffic accidents and affect the operational capabilities of autonomous vehicles travelling near them. Even though knowing the physical properties of these aerosols is essential for testing and validating sensors for environment perception and recognition of autonomous vehicles, there is little information about them. In this work the physical characteristics of spray clouds produced by heavy vehicles rolling on wet asphalt were measured by optical methods. Time resolved droplet size, mass concentration, number density, light extinction and contrast attenuation parallel and perpendicular to the travelling direction of the vehicle were measured. Vehicle velocity, vehicle configuration and water depth were varied during the tests. Results show that the average droplet diameter ranges between 100 and 400 μm with maximum diameters of almost 4 mm. Mass concentration gamuts between 0,2 and 0,7 kg/m3 with peaks surpassing 1 kg/m3 while number density spans between 20 and 40 cm−3 and occasionally exceeds 100 cm−3. Light extinction can reach levels as high as 0,2 m−1 and contrast, evaluated from images, can reach values under 0,1. 

sted, utgiver, år, opplag, sider
Elsevier B.V., 2021
Emneord
Autonomous vehicles, Road aerosols, Tyre spray, Visibility, Accidents, Asphalt, Drops, Light extinction, Roads and streets, Tires, Heavier vehicles, Mass concentration, Number density, Physical characteristics, Road aerosol, Road traffic accidents, Spray cloud, Tire spray, Wet road, Aerosols
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-56007 (URN)10.1016/j.jweia.2021.104734 (DOI)2-s2.0-85112485457 (Scopus ID)
Merknad

Funding text 1: The authors acknowledge the members and staff of AstaZero for the valuable support during the measuring campaign. The support of Christian Badenfelt documenting graphically the tests is highly appreciated.

Tilgjengelig fra: 2021-08-30 Laget: 2021-08-30 Sist oppdatert: 2023-06-05bibliografisk kontrollert
Ochoterena, R., Andersson, M. & Andersson, S. (2020). Apparent Soot Size and Concentration in Combusting Diesel Jets at High Gas Pressures and Temperatures Measured by Combining Quasi-Simultaneous LII, Elastic Light Scattering and Light Extinction. Paper presented at SAE 2020 World Congress Experience, WCX 2020; TCF CenterDetroit; United States; 21 April 2020 through 23 April 2020. SAE technical paper series, April(April), Article ID 2020-01-0787.
Åpne denne publikasjonen i ny fane eller vindu >>Apparent Soot Size and Concentration in Combusting Diesel Jets at High Gas Pressures and Temperatures Measured by Combining Quasi-Simultaneous LII, Elastic Light Scattering and Light Extinction
2020 (engelsk)Inngår i: SAE technical paper series, ISSN 0148-7191, Vol. April, nr April, artikkel-id 2020-01-0787Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A method for measuring apparent soot particle size and concentration in turbulent combusting diesel jets with elevated and inhomogeneous optical density is presented and discussed. The method is based on the combination of quasi-simultaneous Laser Induced Incandescence (LII), Elastic Scattering (ELS) and Light Extinction (LE) measurements exhibiting a high potential for spatially resolved measurements of carbonaceous particles in flames and residual gases at a given instant. The method evaluates the LII signal by calculating the laser fluence across the flame and compensating for signal trapping, allowing measurements where laser extinction between the flame borders reaches values up to 90 %. The method was implemented by measuring particle size and concentration in the middle sagittal axis of optically dense, combusting diesel jets at a certain time after the start of combustion. Experiments were carried out in the Chalmers High Pressure, High Temperature spray rig under conditions similar to those prevailing in direct injected compression ignition engines. Measurements of apparent particle size and concentration together with volume fraction conferring an instantaneous single-shot case and an average measurement from several consecutive jets are presented and discussed.

sted, utgiver, år, opplag, sider
SAE International, 2020
Emneord
Diesel engines, Elastic scattering, Light extinction, Light scattering, Soot, Carbonaceous particles, Compression ignition engine, Elastic light scattering, High gas pressures, Laser induced incandescence, Quasi-simultaneous, Spatially resolved, Start of combustion, Particle size
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-44786 (URN)10.4271/2020-01-0787 (DOI)2-s2.0-85083857670 (Scopus ID)
Konferanse
SAE 2020 World Congress Experience, WCX 2020; TCF CenterDetroit; United States; 21 April 2020 through 23 April 2020
Merknad

Funding details: Canada Excellence Research Chairs, Government of Canada, CERC; Funding text 1: The authors acknowledge the financial support of CERC (Combustion Engine Research Centre) at Chalmers and its member companies.

Tilgjengelig fra: 2020-06-15 Laget: 2020-06-15 Sist oppdatert: 2023-06-05bibliografisk kontrollert
Ochoterena, R., Andersson, M. & Andersson, S. (2020). Apparent Soot Size and Concentration in Combusting Diesel Jets at High Gas Pressures and Temperatures Measured by Combining Quasi-Simultaneous LII, Elastic Light Scattering and Light Extinction. SAE Int. J. Adv. & Curr. Prac. in Mobility, 2(3), 1578-1591
Åpne denne publikasjonen i ny fane eller vindu >>Apparent Soot Size and Concentration in Combusting Diesel Jets at High Gas Pressures and Temperatures Measured by Combining Quasi-Simultaneous LII, Elastic Light Scattering and Light Extinction
2020 (engelsk)Inngår i: SAE Int. J. Adv. & Curr. Prac. in Mobility, ISSN 2641-9637, Vol. 2, nr 3, s. 1578-1591Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A method for measuring apparent soot particle size and concentration in turbulent combusting diesel jets with elevated and inhomogeneous optical density is presented and discussed. The method is based on the combination of quasi-simultaneous Laser Induced Incandescence (LII), Elastic Scattering (ELS) and Light Extinction (LE) measurements exhibiting a high potential for spatially resolved measurements of carbonaceous particles in flames and residual gases at a given instant. The method evaluates the LII signal by calculating the laser fluence across the flame and compensating for signal trapping, allowing measurements where laser extinction between the flame borders reaches values up to 90%. The method was implemented by measuring particle size and concentration in the middle sagittal axis of optically dense, combusting diesel jets at a certain time after the start of combustion. Experiments were carried out in the Chalmers High Pressure, High Temperature spray rig under conditions similar to those prevailing in direct injected compression ignition engines. Measurements of apparent particle size and concentration together with volume fraction conferring an instantaneous single-shot case and an average measurement from several consecutive jets are presented and discussed.

HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-48914 (URN)10.4271/2020-01-0787 (DOI)
Tilgjengelig fra: 2020-10-15 Laget: 2020-10-15 Sist oppdatert: 2023-06-05bibliografisk kontrollert
Ochoterena, R. & Försth, M. (2018). The effect of thermochromic coatings of VO2 on the fire performance of windows. Fire and Materials, 42(7), 873-876
Åpne denne publikasjonen i ny fane eller vindu >>The effect of thermochromic coatings of VO2 on the fire performance of windows
2018 (engelsk)Inngår i: Fire and Materials, ISSN 0308-0501, E-ISSN 1099-1018, Vol. 42, nr 7, s. 873-876Artikkel, forskningsoversikt (Fagfellevurdert) Published
Abstract [en]

The effect of thermochromic coatings of vanadium dioxide (VO2) on the fire performance of windows was experimentally tested. Prototypes were subjected to radiant heat and the radiation transmitted through the specimens was measured as a function of time. The results indicate that windows coated with VO2 can reduce radiative heat transfer from fires and thereby also reduce or prevent fire spread. The results clearly show that VO2coatings on BK7 substrates hinder approximately 30% of the transmission of radiation from fire sources when compared with the performance of uncoated windows. It is expected that VO2 will not be solely implemented for the purpose of increasing fire performance of windows, but it will rather provide a secondary positive effect if such windows are realized for energy‐saving purposes.

HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-33937 (URN)10.1002/fam.2630 (DOI)2-s2.0-85047463692 (Scopus ID)
Tilgjengelig fra: 2018-06-13 Laget: 2018-06-13 Sist oppdatert: 2023-06-05bibliografisk kontrollert
Organisasjoner
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-4687-9554
v. 2.45.0