Simulation benchmark based on THAI-experiment on dissolution of a steam stratification by natural convection
| Autor: | M. Freitag, Sanjeev Gupta, E. Schmidt, G. Poss |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Nuclear and High Energy Physics
Engineering Hydrogen Convective heat transfer 020209 energy Nuclear engineering chemistry.chemical_element Stratification (water) 02 engineering and technology Computational fluid dynamics complex mixtures law.invention law 0202 electrical engineering electronic engineering information engineering General Materials Science Safety Risk Reliability and Quality Waste Management and Disposal Simulation Natural convection business.industry Mechanical Engineering Superheated steam Nuclear reactor Dilution Nuclear Energy and Engineering chemistry business |
| Zdroj: | Nuclear Engineering and Design. 299:37-45 |
| ISSN: | 0029-5493 |
| DOI: | 10.1016/j.nucengdes.2015.07.001 |
| Popis: | Locally enriched hydrogen as in stratification may contribute to early containment failure in the course of severe nuclear reactor accidents. During accident sequences steam might accumulate as well to stratifications which can directly influence the distribution and ignitability of hydrogen mixtures in containments. An international code benchmark including Computational Fluid Dynamics (CFD) and Lumped Parameter (LP) codes was conducted in the frame of the German THAI program. Basis for the benchmark was experiment TH24.3 which investigates the dissolution of a steam layer subject to natural convection in the steam-air atmosphere of the THAI vessel. The test provides validation data for the development of CFD and LP models to simulate the atmosphere in the containment of a nuclear reactor installation. In test TH24.3 saturated steam is injected into the upper third of the vessel forming a stratification layer which is then mixed by a superposed thermal convection. In this paper the simulation benchmark will be evaluated in addition to the general discussion about the experimental transient of test TH24.3. Concerning the steam stratification build-up and dilution of the stratification, the numerical programs showed very different results during the blind evaluation phase, but improved noticeable during open simulation phase. |
| Databáze: | OpenAIRE |
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