Influence of water mist on flame acceleration, DDT and detonation in H2-air mixtures

L. R. Boeck; A. Kink; D. Oezdin; J. Hasslberger; T. Sattelmayer

doi:10.1016/j.ijhydene.2015.03.129

Influence of water mist on flame acceleration, DDT and detonation in H₂-air mixtures

L. R. Boeck, A. Kink, D. Oezdin, J. Hasslberger, T. Sattelmayer

Chair of Thermodynamics

Technical University of Munich

Research output: Contribution to journal › Article › peer-review

54 Scopus citations

Abstract

The influence of water mist on explosion of H₂-air mixtures is studied experimentally in a closed channel with rectangular cross section. The investigated range of H₂ concentrations covers slow flames, accelerating flames, transition to detonation and detonations. Water loading ratios particularly relevant for severe accident scenarios in nuclear power plants are examined. A system for water mist generation and injection was designed such that the experimental conditions are well defined. The water loading ratio is determined by extinction measurement in each experiment. Laser diffraction measurements provide the droplet size distribution. Water mist injection results in lower overpressure and retarded transition to detonation compared to dry H₂-air mixtures. The effect of a 0.11-0.12 kg/m³ water loading ratio is comparable to a decrease in H₂ concentration by 0.6%vol in the deflagration regime and by 1-2%vol in the detonation regime, while transition to detonation is retarded more significantly.

Original language	English
Pages (from-to)	6995-7004
Number of pages	10
Journal	International Journal of Hydrogen Energy
Volume	40
Issue number	21
DOIs	https://doi.org/10.1016/j.ijhydene.2015.03.129
State	Published - 8 Jun 2015

Keywords

DDT
Explosion
Mitigation
Water mist

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.ijhydene.2015.03.129

Cite this

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title = "Influence of water mist on flame acceleration, DDT and detonation in H2-air mixtures",

abstract = "The influence of water mist on explosion of H2-air mixtures is studied experimentally in a closed channel with rectangular cross section. The investigated range of H2 concentrations covers slow flames, accelerating flames, transition to detonation and detonations. Water loading ratios particularly relevant for severe accident scenarios in nuclear power plants are examined. A system for water mist generation and injection was designed such that the experimental conditions are well defined. The water loading ratio is determined by extinction measurement in each experiment. Laser diffraction measurements provide the droplet size distribution. Water mist injection results in lower overpressure and retarded transition to detonation compared to dry H2-air mixtures. The effect of a 0.11-0.12 kg/m3 water loading ratio is comparable to a decrease in H2 concentration by 0.6%vol in the deflagration regime and by 1-2%vol in the detonation regime, while transition to detonation is retarded more significantly.",

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AU - Boeck, L. R.

AU - Kink, A.

AU - Oezdin, D.

AU - Hasslberger, J.

AU - Sattelmayer, T.

PY - 2015/6/8

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AB - The influence of water mist on explosion of H2-air mixtures is studied experimentally in a closed channel with rectangular cross section. The investigated range of H2 concentrations covers slow flames, accelerating flames, transition to detonation and detonations. Water loading ratios particularly relevant for severe accident scenarios in nuclear power plants are examined. A system for water mist generation and injection was designed such that the experimental conditions are well defined. The water loading ratio is determined by extinction measurement in each experiment. Laser diffraction measurements provide the droplet size distribution. Water mist injection results in lower overpressure and retarded transition to detonation compared to dry H2-air mixtures. The effect of a 0.11-0.12 kg/m3 water loading ratio is comparable to a decrease in H2 concentration by 0.6%vol in the deflagration regime and by 1-2%vol in the detonation regime, while transition to detonation is retarded more significantly.

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