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  2. PRESLHY Experiment series E3.1 (Cryogenic Hydrogen Blow-down/Discharge) results – part A "high pressure"
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    Dataset: PRESLHY Experiment series E3.1 (Cryogenic Hydrogen Blow-down/Discharge) results – part A "high pressure"

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    Alternate identifier:
    (KITopen-DOI) 10.5445/IR/1000096833
    Related identifier:
    -
    Creator/Author:
    Jordan, Thomas [Jordan, Thomas]
    Contributors:
    (Other)
    Friedrich, Andreas [Friedrich, Andreas]

    (Other)
    Veser, Anke [Veser, Anke]

    (Other)
    Kotchourko, Natalie [Kotchourko, Natalie]
    Title:
    PRESLHY Experiment series E3.1 (Cryogenic Hydrogen Blow-down/Discharge) results – part A "high pressure"
    Additional titles:
    -
    Description:
    (Abstract) In the frame of the PRESLHY project more than 200 hydrogen blow-down experiments were made with the DisCha-facility at KIT and about half of the experiments were made at cryogenic temperatures (approx. 80 K). During the experimental campaign the facility was continuously improved and extended, since... In the frame of the PRESLHY project more than 200 hydrogen blow-down experiments were made with the DisCha-facility at KIT and about half of the experiments were made at cryogenic temperatures (approx. 80 K). During the experimental campaign the facility was continuously improved and extended, since several problems with the facility and instrumentation were encountered. However, the tests showed very good reproducibility. Although the actual exploitation of the data is left for the further modelling work in the work packages WP3 and WP4, some interesting observations are: not a single test showed a spontaneous ignition, although the cold jets generated relative strong electrostatic fields. This static electricity seems to be generated by ice crystal which form on the release nozzle before the tests. The cold tests with large diameter and high pressure show strong temperature decay in the reservoir close to the boiling point of hydrogen and quite a huge fraction of “particles” entrained in the released jet were recorded. It is assumed that this is ice from ambient humidity and frozen on the nozzle before the actual test. However, there might be condensed hydrogen involved, as the acceleration of the gas through the nozzle might bring down the temperature below the boiling point. Only detailed multi-phase simulations accounting for non-equilibrium effects of the real gases’ behaviour might clarify this issue.

    In the frame of the PRESLHY project more than 200 hydrogen blow-down experiments were made with the DisCha-facility at KIT and about half of the experiments were made at cryogenic temperatures (approx. 80 K). During the experimental campaign the facility was continuously improved and extended, since several problems with the facility and instrumentation were encountered. However, the tests showed very good reproducibility. Although the actual exploitation of the data is left for the further modelling work in the work packages WP3 and WP4, some interesting observations are: not a single test showed a spontaneous ignition, although the cold jets generated relative strong electrostatic fields. This static electricity seems to be generated by ice crystal which form on the release nozzle before the tests. The cold tests with large diameter and high pressure show strong temperature decay in the reservoir close to the boiling point of hydrogen and quite a huge fraction of “particles” entrained in the released jet were recorded. It is assumed that this is ice from ambient humidity and frozen on the nozzle before the actual test. However, there might be condensed hydrogen involved, as the acceleration of the gas through the nozzle might bring down the temperature below the boiling point. Only detailed multi-phase simulations accounting for non-equilibrium effects of the real gases’ behaviour might clarify this issue.

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    (Technical Remarks) Result dataset files in Excel format of the sub-set of experiments with most mature measurement set-up. Data for all initial pressure levels, but same temperature (tt=80K/300K) and same nozzle diameter (mm=05/1/2/4mm) packed in zip file, named PRE3P1A_KIT_Dmm_ttK_DATA.zip

    Result dataset files in Excel format of the sub-set of experiments with most mature measurement set-up. Data for all initial pressure levels, but same temperature (tt=80K/300K) and same nozzle diameter (mm=05/1/2/4mm) packed in zip file, named PRE3P1A_KIT_Dmm_ttK_DATA.zip

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    Keywords:
    Hydrogen safety
    cryogenic
    release
    liquid hydrogen
    blow-down
    discharge
    Related information:
    -
    Language:
    -
    Publishers:
    Karlsruhe Institute of Technology
    Production year:
    2019
    Subject areas:
    Engineering
    Resource type:
    Dataset
    Data source:
    -
    Software used:
    -
    Data processing:
    -
    Publication year:
    2023
    Rights holders:
    Jordan, Thomas
    Funding:
    -
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    Name Storage Metadata Upload Action
    Status:
    Published
    Uploaded by:
    kitopen
    Created on:
    2023-04-20
    Archiving date:
    2023-06-21
    Archive size:
    1.3 GB
    Archive creator:
    kitopen
    Archive checksum:
    b4d245866b7daed5705a06415a83b013 (MD5)
    Embargo period:
    -
    DOI: 10.35097/1187
    Publication date: 2023-06-21
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    Rights statement for the dataset
    This work is licensed under
    CC BY 4.0
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    Cite Dataset
    Jordan, Thomas (2023): PRESLHY Experiment series E3.1 (Cryogenic Hydrogen Blow-down/Discharge) results – part A "high pressure". Karlsruhe Institute of Technology. DOI: 10.35097/1187
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