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UID:event-61@tuemeche.nl
DTSTAMP:20261008T003343Z
DTSTART;TZID=Europe/Amsterdam:20261005T133000
DTEND;TZID=Europe/Amsterdam:20261005T143000
SUMMARY:High-spatial-resolution characterization of underexpanded hydroge
 n jets using spontaneous Raman scattering
DESCRIPTION:Speaker: Quinn Kuijpers\nHost: Conrad Hessels\n\nThe hydrogen
  jet lies at the foundation of H2 internal combustion engine (ICE) techno
 logy\,\nwhich is why investigation of its characteristics is necessary to
  advance the implementation\nand improve the H2 ICE. In this work\, spont
 aneous Raman scattering is used to\ninvestigate the temperature\, hydroge
 n number density\, and hydrogen mole fraction of a\ncontinuous hydrogen j
 et emanating into atmospheric air. Both vibrational and rotational\nRaman
  scattering methods are used to investigate the temperature field of the 
 jet with\nhigh spatial resolution\, using a spatial sampling interval of 
 0.1 mm in the axial direction\nand 0.06 mm in the radial direction. Three
  different pressure ratios and two different nozzle\norifice diameters ar
 e studied. Schlieren imaging identifies shock structures within the\njet 
 and supports the interpretation of the Raman measurements. The jet is cha
 racterized\nby repetitions of low-to-high-temperature zones in the center
  of the jet\, with increasing\ntemperature at the edges of the jet. The h
 ydrogen number density follows the main temperature\nstructure of the jet
 \, while the hydrogen mole fraction is close to one in the center\nof the
  jet\, decreasing toward the jet boundary and further downstream due to m
 ixing with\nthe entrained air. Rotational and vibrational Raman measureme
 nts show similar overall\ntemperature structures and values. The pressure
  ratio (nPr) affects both the temperature\ndistribution and size of the j
 et. The temperature decreases by approximately 50–70 K\nbetween nPr = 3
  and nPr = 8\, while the size of the jet structures increases for nPr =\n
 8. The nozzle diameter mainly affects the spatial dimensions of the jet a
 nd its shock\nstructures. A comparison between nozzles shows similar quan
 titative temperatures along\nthe jet axis\, with the only appreciable tem
 perature differences between the nozzles being\na 10 K higher minimum tem
 perature for the bigger nozzle size at nPr = 3.
LOCATION:Pendulum 0.36
URL:https://tuemeche.nl/peoplepages/event.php?id=61
CATEGORIES:MSc Thesis Defense
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