한국형 TBM 내 MHD 유동 수치해석을 위한 CFX EM 코드검증 및 시스템 코드 개발 방법론 제시

Abstract

Pressure loss of Magnetohydrodynamics (MHD) of liquid metal breeder flow is key issue in the Test Blanket Module (TBM) development. To reduce the load from the Lorentz force formed by interaction between liquid metal breeder flow and external magnetic field confining plasma, many researches about the MHD physics and design study of TBMs have been performed for a few decades in nuclear fusion engineering application. In the same context, this study is also to figure out the MHD physics, validate the ability of MHD calculation through commercial code (CFX) and suggest a methodology of development for system code which is able to reflect MHD on the channel flow. The commercial code, which is CFX EM module, will be employed to simulate the liquid metal flow in the KO TBM after this validation works, and it is used to consider and design the TBM concepts. System code, called MARS-FR, will be adopted to calculate bulk system flow and consider the safety and system load. In order to verify the MHD calculation, benchmarking problem comparison with previous experimental studies of the MHD channel flow is implemented. Among the experimental studies, cases, which are related with nuclear fusion engineering, are selected to be compared with CFX calculation. Those experiments have characteristics of strong magnetic field (~2T) and liquid lithium as a working fluid. Through the comparison procedure with several previous studies, both aspects of pressure loss and heat transfer of channel flow are investigated. In order to suggest the methodology of system code development, MHD calculation schemes and pilot, a test version of MARS, were surveyed and studied. According to semi-implicit calculation scheme of pilot, miyazaki MHD pressure loss calculation scheme is adopted to develop the one dimensional system code. CFX EM calculation of MHD pressure loss shows very good agreement with experimental results, while heat transfer could not agree very well. Pilot code is developed to reflect MHD pressure calculation, and it shows very good agreement with miyazaki solution. And, based on the validated result of CFX MHD calculation, the development methodology of system code is validated.