Modelling of helical coil steam generator of MOTEL facility with Computational Fluid Dynamics (CFD) code
Toleukaiyr, Tokzhan (2023)
Diplomityö
2023
School of Energy Systems, Energiatekniikka
Kaikki oikeudet pidätetään.
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe20231002138218
https://urn.fi/URN:NBN:fi-fe20231002138218
Tiivistelmä
The MOTEL test facility is a model of an integral pressurized water small modular reactor that runs on natural circulation, and it is located at LUT University, Finland. The MOTEL facility has a steam generator with a helical coil and a generic core rod bundle. The facility is used to conduct thermal-hydraulic experiments and to provide data for the validation of safety analysis tools such as subchannel codes, computational fluid dynamics (CFD) codes, and thermal-hydraulic system codes.
In this thesis, the ANSYS Fluent CFD code has been used to model a single helical coil and helical coil immersed in a cylindrical pool to investigate the effectiveness of the system. The Volume of Fluid (VOF) method with an implicit scheme, the Lee model and a user-defined function for mass transfer have been utilized for the simulation. The used turbulence model is the k-ɛ model with standard wall functions as it has been extensively used in the literature.
The results suggest that all the simulated cases are comparable to each other. For the different boundary conditions, the outlet temperature of the coil was in the range of 463-473 K, the velocity was between 30 and 40 m/s, and the liquid-water volume fraction was between 0.148 and 0.2. Finally, the future research directions are suggested.
In this thesis, the ANSYS Fluent CFD code has been used to model a single helical coil and helical coil immersed in a cylindrical pool to investigate the effectiveness of the system. The Volume of Fluid (VOF) method with an implicit scheme, the Lee model and a user-defined function for mass transfer have been utilized for the simulation. The used turbulence model is the k-ɛ model with standard wall functions as it has been extensively used in the literature.
The results suggest that all the simulated cases are comparable to each other. For the different boundary conditions, the outlet temperature of the coil was in the range of 463-473 K, the velocity was between 30 and 40 m/s, and the liquid-water volume fraction was between 0.148 and 0.2. Finally, the future research directions are suggested.