Development of a generalized integral jet model

Nijs Jan Duijm, A. Kessler, Frank Markert

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    Abstract

    Integral type models to describe stationary plumes and jets in cross-flows (wind) have been developed since about 1970. These models are widely used for risk analysis, to describe the consequences of many different scenarios. Alternatively, CFD codes are being applied, but computational requirements still limit the number of scenarios that can be dealt with using CFD only. The integral models, however, are not suited to handle transient releases, such as releases from pressurized equipment, where the initially high release rate decreases rapidly with time. Further, on gas ignition, a second model is needed to describe the rapid combustion of the flammable part of the plume (flash fire) and a third model has to be applied for the remaining jet fire. The objective of this paper is to describe the first steps of the development of an integral-type model describing the transient development and decay of a jet of flammable gas after a release from a pressure container. The intention is to transfer the stationary models to a fully transient model, capable to predict the maximum extension of short-duration, high pressure jets. The model development is supported by conducting a set of transient ignited and unignited spontaneous releases at initial pressures between 25bar and 400bar. These data forms the basis for the presented model development approach.
    Original languageEnglish
    Title of host publicationProceedings of the 7th International Conference on Hydrogen Safety
    Number of pages12
    Publication date2017
    Article number243
    Publication statusPublished - 2017
    Event7th International Conference on Hydrogen Safety - Hamburg, Germany
    Duration: 11 Sept 201713 Sept 2017
    Conference number: 7

    Conference

    Conference7th International Conference on Hydrogen Safety
    Number7
    Country/TerritoryGermany
    CityHamburg
    Period11/09/201713/09/2017

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