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  • 1.
    Brandt, Jonas
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Modin, Håkan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Rosén, Fredrik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Försth, Michael
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Ochoterena, Raul
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Test Method for Fire Suppression Systems in Bus and Coach Engine Compartments2013Conference paper (Refereed)
  • 2.
    Brandt, Jonas
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Willstrand, Ola
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Ochoterena, Raul
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Rakovic, Alen
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Försth, Michael
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Detection of fires in Heavy Duty (HD) vehiclesIn: Enhanced Safety of Vehicles ESV2015, , p. 15-0074-WConference paper (Other academic)
  • 3.
    Försth, Michael
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Ochoterena, Raul
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    On the mitigation of shock waves by exciting vibrational modes in water droplets2013Report (Refereed)
    Abstract [en]

    The vibrational energy of water droplets has been investigated. Viscosity was neglected and only the lowest order symmetrical vibration, the quadrupole mode with m=0, was considered. An approximative solution was given by Rayleigh in 1879: w_vib=2a^2 ??r_0?^2 where ? is the relative vibration amplitude, ? is the surface tension, and r0 is the droplet radius at equilibrium, that is the radius of the spherical droplet. It was found that this solution agrees with the exact solution within a few percent for moderate values of the relative amplitude ?. The rationale of this study was to investigate whether dissipation of energy from a shock wave, e.g. from an explosion, into vibrational energy of droplets is a mechanism that needs to be considered on order to accurately model explosion mitigation using water mists. Traditionally droplet vibrations are not considered in such models whereas other mechanisms such as translational energy, heating, evaporation, and droplet breakup are considered. A useful parameter for quantifying the relative importance of vibrations as compared to linear acceleration of droplets is the ratio between vibrational and translational kinetic energy. This ratio is given by 3a^2 ?/(?p?r_0 v?_transl^2 ) where vtransl is the translational velocity to which the droplet has been accelerated by the shock front. This ratio is negligible for a particular severe explosion scenario where information on vtransl was available in the literature. For other cases vibrations might be of some significance but detailed information about the specific scenarios is needed to obtain detailed results. More work is needed in order to understand the effect of viscosity and higher order vibrations. Furthermore a model for the excitation of droplet vibrations by shock waves is required for modelling. Finally there is a lack of experimental knowledge on droplet size distribution for water mist interacting with a shock wave.

  • 4.
    Försth, Michael
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Ochoterena, Raul
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Lindström, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Lasermätningar av droppstorleksfördelningen för skärsläckaren2013In: Brandposten, no 49, p. 36-37Article in journal (Other (popular science, discussion, etc.))
  • 5.
    Försth, Michael
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Ochoterena, Raul
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Lindström, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Spray characterization of the cutting extinguisher2012Report (Refereed)
  • 6.
    Ochoterena, Raul
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Bryntesson, Kalle
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Hot surface ignition of alternative fuels2012In: Brandposten, no 46, p. 40-Article in journal (Other (popular science, discussion, etc.))
  • 7.
    Ochoterena, Raul
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Bryntesson, Kalle
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Hot surface ignition of alternative fuels2014In: 6th International. Marseille, France. 2014-10-01--02, SP Sveriges Tekniska Forskningsinstitut , 2014, , p. 655-656Conference paper (Other academic)
  • 8.
    Ochoterena, Raul
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Försth, Michael
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Elektriska urladdningar för flamdetektion2011In: Brandposten, no 45, p. 27-Article in journal (Other (popular science, discussion, etc.))
  • 9.
    Ochoterena, Raul
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Försth, Michael
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Measuring breakdown voltage for objectively detecting ignition in fire research2013In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 24, no 10, p. 105802-Article in journal (Refereed)
  • 10.
    Ochoterena, Raul
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Försth, Michael
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Pilot spark energy in the cone calorimeter: A source of measurement uncertainties2014In: Fire and Materials, ISSN 0308-0501, E-ISSN 1099-1018, Vol. 38, no 7, p. 760-764Article in journal (Refereed)
  • 11.
    Ochoterena, Raul
    et al.
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Försth, Michael
    RISE - Research Institutes of Sweden, Safety and Transport, Safety. Luleå University of Technology, Sweden.
    The effect of thermochromic coatings of VO2 on the fire performance of windows2018In: Fire and Materials, ISSN 0308-0501, E-ISSN 1099-1018, Vol. 42, no 7, p. 873-876Article, review/survey (Refereed)
    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.

  • 12. Ochoterena, Raul
    et al.
    Gehandler, Jonatan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Ingason, Haukur
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, skydd (BRs ).
    Extern detektering av brand på tåg i rörelse2013In: Brandposten, no 48, p. 9-Article in journal (Other (popular science, discussion, etc.))
  • 13.
    Ochoterena, Raul
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Hjohlman, Maria
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Brandteknik, forskning (BRf ).
    Detection of fires in the engine compartment of heavy duty vehicles, a theoretical study2014In: SAE 2014 World Congress and Exhibition;, 2014, , p. 423Conference paper (Other academic)
  • 14.
    Ochoterena, Raul
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Roux, Fabienne
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Sandinge, Anna
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Nylander, Christoffer
    Björnstig, Ulf
    Skrifvars, Mikael
    Post-collision fires in road vehicles, a pre-study2016Report (Other academic)
  • 15.
    Ochoterena, Raul
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Willstrand, Ola
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Brandt, Jonas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Försth, Michael
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Detection of fires in Heavy Duty (HD) vehicles2014In: Proceedings from 3rd International Conference on Fire in Vehicles - FIVE 2014, 2014, , p. 201-207Conference paper (Other academic)
  • 16.
    Ochoterena, Raul
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Willstrand, Ola
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Försth, Michael
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Electrosprays for fire suppression2016Report (Other academic)
    Abstract [en]

    A continuous current with a potential ranging between 10 and 30 kV was applied to a single-hole nozzle for modifying the properties of the generated water spray. The nozzle produced a full-cone spray by injecting water into quiescent air at atmospheric conditions varying the injection pressure between 0.2 and 0.6 MPa. Back-illuminated photography and laser-based holography were used for recording the effect of the electrical current on spray properties such as cone angle and droplet sizes. Results from this study indicate that applying a potential above 20 kV yields wider cone angles, more homogenously distributed spray patterns, and reduced droplet sizes than non-assisted sprays.Key words: electrosprays, water mist

  • 17.
    Svensson, Robert
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Lindström, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Ochoterena, Raul
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Försth, Michael
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    CFD simulations of the Cutting extinguisher2014Report (Refereed)
    Abstract [en]

    Developing tactics for extinguishing fires located in civil structures is needed. Nowadays, the most commonly procedure employed by most fire brigades when extinguishing fires located in the interior of buildings, consists in sending a unit of firefighters inside the structure spraying water on the surface of the burning fuels. This procedure has enormous caveats since it leads to the unavoidable necessity of exposing personal to situations where risks to their personal safety are major. An alternative to these tactics consists on using the Cutting extinguisher which in principle allows combating a fire by injecting water mist into the burning building without the necessity of entering it. This work studies the capabilities and limitations of the Cutting extinguisher when used for fire-fighting activities in conventional and idealised civil structures by the aid of computerised simulations and experimental data. The simulations were done using Fire Dynamics Simulator (FDS) which is an open-source code for modelling well-ventilated fires while experimental data was obtained from idealised and controlled fires and experiments. Findings of this study suggest that the Cutting extinguisher is effective for combating fires of moderated size in confinements using less water than traditional methods by reducing the relative concentration of oxygen in the room instead of by cooling the fuels as traditional methods do. The high velocity of the jet induces mixing in the confinement, enhancing the interaction of droplets with hot combustion products and promoting the vaporisation of the injected water. Furthermore, the induced momentum to the gases in the room together with the vaporisation of the injected water reduces the overall gas temperature inside the structure.

  • 18.
    Svensson, Robert
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Ochoterena, Raul
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Försth, Michael
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Spraystimuleringar i FDS2015In: Brandposten, no 53, p. 16-17Article in journal (Other (popular science, discussion, etc.))
  • 19.
    Willstrand, Ola
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Brandt, Jonas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Karlsson, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Ochoterena, Raul
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Kovacevic, Vedran
    Fire detection & fire alarm systems in heavy duty vehicles: WP2 – Factors influencing detector performance in vehicles2015Report (Refereed)
  • 20.
    Willstrand, Ola
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Brandt, Jonas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Ochoterena, Raul
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Försth, Michael
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Detection of fires in Heavy Duty (HD) vehicles2014In: Proceedings from 15th International Conference on Automatic Fire Detection - AUBE´14, 2014, , p. 171-178Conference paper (Refereed)
  • 21.
    Willstrand, Ola
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Svensson, Robert
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Försth, Michael
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Ochoterena, Raul
    Spray diagnostics using holography and wavelet analysis2016Report (Other academic)
    Abstract [sv]

    In-line holography, where the reference beam coincides with the beam that is scattered against the droplets, has been found to be a versatile and simple experimental method for spray diagnostics using holography. Such an experiment was setup and a water spray was studied and holograms of high quality was obtained using a CCD-camera.

    The holograms were analysed with Wavelet analysis, implemented as a Matlab program. It was found that the droplets’s size and position could be reconstructed with reasonable accuracy. Future work will focus on a dynamic analysis program that dynamically adapts the wavelet analysis parameters to each detected droplet.

    Key words: spray diagnostics, laser diagnostics, holography, image processing, wavelet analysis

1 - 21 of 21
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