Multi-compartment hydrogen deflagration experiments and model development

Kanzleiter, T.; Fischer, K.

doi:10.1016/0029-5493(94)90347-6

Cited by 16 publications

(3 citation statements)

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“…Generally, there are two kinds of methods simulating the hydrogen distribution in an enclosure, including lumped‐parameter method and CFD codes. Date back to the period of the Three Mile Island accident, GOTHIC and CONTAIN codes were adopted to model the whole containment and then the average value of hydrogen concentration in each control volume were obtain. However, they could not predict the hydrogen concentration in local region, due to the restricted number of control volumes, and also they could not describe the turbulent diffusion behavior during the process of build‐up and erosion of stratification due to their lack of necessary turbulence models.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on erosion of hydrogen stratification by steam jet within a local compartment

2020

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Summary During hypothetical severe accidents in nuclear power plants, a large amount of hydrogen is generated rapidly as a result of zirconium‐water reaction and released into local compartments. Deflagration or detonation risk is probably caused by the uneven hydrogen distribution. Generally, buoyancy drives light combustible gas up to establish gas stratification. On the other hand, stratification may be destroyed by convection flow from steam injection due to coolant's discharge from the primary loop. The mechanism of erosion of stratification can be divided into buoyancy dominated and momentum dominated regimes, the priority of which depends on a nondimensional parameter, named of interaction Froude number. However, jet velocity and the diameter on the interface between steam and stratification are difficult to measure in experiments. Therefore, CFD method is adopted to capture a detailed velocity profile to solve this problem. In this article, a CFD model of single local compartment facility is built and helium distribution behavior within the local compartment is fully investigated, as a substitute of hydrogen, which is usually used in experiments. Prior to determining the interaction Froude number, four flow models, including laminar flow model, algebraic model, k‐ε turbulence model and shear stress transport (SST) k‐ω model are evaluated under three typical experimental stages, including light gas injection, the formation of stratification, and the erosion of stratification. Results show that SST k‐ω model can predict much better under these specific conditions in the small‐scaled configuration, compared to the experimental results. Next, with the setup of a helium stratification structure with homogeneous layer and gradient layer, the interaction between steam and gradient layer is analyzed in detail. The mechanisms of erosion of stratification can be divided into complete penetration, destruction from the bottom level to the top and soft dissolution without penetration, corresponding to the interaction Froude numbers of being greater than 1, close to 1, and far less than 1. The simulation results are consistent with relevant literature findings. The present work can help studying the complex hydrogen distribution process in local compartment and provide data for evaluation of postinerting strategy in severe accident management.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation on erosion of hydrogen stratification by steam jet within a local compartment

2020

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“…In previous decades, scientists have developed two thermal-hydraulics approaches i.e., Lumped parameters (LP) and computational fluid dynamics (CFD) codes to simulate the related problems in the reactor core (Prabhudharwadkar et al, 2011;Xiao and Travis, 2013). In the beginning, LP codes such as MAAP and CONTAIN were used to predict the hydrogen safety behavior in the NPP (Kanzleiter and Fischer, 1994). For predicting the average hydrogen concentration in the containment, the LP method is more effective for predicting a longer duration of simulation because of its fast estimation for the hydrogen distribution.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, high-resolution CFD codes were presented for predicting the distribution of hydrogen at low spatial scales. The CFD largely has enhanced the precision, accuracy and analysis of the release of the hydrogen (Kanzleiter and Fischer, 1994;Heck et al, 1995;Bart et al, 2002;Visser et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of Some Key Factors on Turbulence Models for Hydrogen Diffusion Using HYDRAGON Code

Saeed

Zhong

et al. 2020

Front. Energy Res.

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In this paper, we have investigated the influence of air-fountain injection to study the hydrogen diffusion behavior with the help of 3-Dimensional code, HYDRAGON. Three different turbulence models i. e., Standard k −, model, Re-Normalized Group k − m model and Realizable k − e model have been studied carefully and the comparison of simulated data with experimental data were performed. The effect of air-injection was examined using three different velocities i.e., 0.411, 2.803, and 5.143 m/s to evaluate the phenomena of stratification break-up. When we kept the velocity of the air-injection as low as 0.411 m/s, the simulated results obtained through these three turbulence models were very close to experimental data. As the velocity was set to 5.143 m/s, the simulated data captured the experimental data well. But, when the velocity of air-injection was kept 2.803 m/s, the two turbulence models i.e., SKE and RNG turbulence models gave satisfactory results. However, when we added the turbulent diffusivity coefficient to RNG and RLZ turbulence models in the HYDRAGON code, a minor influence was investigated in these simulation results.

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Experimentelle und numerische Modellierung der Wirkung von Gas‐ und Staubexplosionen

Schumann

Rastogi

Fucke

et al. 1997

Chemie Ingenieur Technik

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Multi-compartment hydrogen deflagration experiments and model development

Cited by 16 publications

References 0 publications

Numerical investigation on erosion of hydrogen stratification by steam jet within a local compartment

Numerical investigation on erosion of hydrogen stratification by steam jet within a local compartment

Sensitivity Analysis of Some Key Factors on Turbulence Models for Hydrogen Diffusion Using HYDRAGON Code

Experimentelle und numerische Modellierung der Wirkung von Gas‐ und Staubexplosionen

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