Ling Tao

Thermo-fluid-coupled analysis and simulation of calorimeter of Experimental Advanced Superconducting Tokamak neutral beam injection system on the thermal inertia principle

An efficient and accurate thermo-fluid-coupled analysis is the basis of structure design and optimization for high-heat-flux components in neutral beam injection system of Experimental Advanced Superconducting Tokamak and has an important significance of exploring the optimal structure of components and realizing the temperature control of components at a high-parameter steady-state condition. In this article, take the calorimeter in the Experimental Advanced Superconducting Tokamak–neutral beam injection system on the thermal inertia principle, for example, an accurate numerical solution method of thermo-fluid-coupled analysis based on the turbulent heat transfer is established and combined with the near-wall function model, and the working characteristics of three-dimensional calorimeter plate under different deposited beam powers are simulated and analyzed. The temperature distribution of solid structure and corresponding flow field under given cooling condition is calculated. The results obtained by the proposed method coincide well with experimental results, which validate this method. This study provides a potentially useful method for thermo-fluid-coupled analysis and structural design of other high-heat-flux components in the Experimental Advanced Superconducting Tokamak–neutral beam injection system.

Numerical Analysis for the Swirl Tube Structure of the Cooling System in Neutral Beam Injection System

Temperature control of High-Heat-Flux (HHF) components in Neutral Beam Injection (NBI) system is a very important issue for realizing the high-parameters steady state condition of NBI system. As one of the main HHF components, the V-shaped Residual Ion Dump (RID) with cross-sections structure is studied in this article. In order to enhance heat transfer of the fluent, the initial design with the swirl tubes is presented, and one side of the symmetrical ion dump under the designed inlet pressure is modeled. The flow field inside swirl tubes and the temperature distribution of the upper surface of the dump are simulated. This study provides a sample of solving the problem about how to protect all of the HHF components.Copyright

Development of Data Acquisition and Protection System of Infrared Thermometer for EAST NBI

Abstract Neutral beam injection (NBI) is one of the heating methods in tokamaks. In the process of injection, the neutral particles will not be absolutely absorbed by plasma. The unabsorbed neutral particles penetrate plasma and are shot at inner wall tiles. It will cause the temperature increases of armor tiles that are placed opposite the NBI injection windows. In order to ensure that the armor tiles work during a safe interval, the data acquisition and protection system of infrared thermometer has been developed. The system achieves the functions of isolated transmission, remote monitoring, and fast protection. The response time of data acquisition and protection system is less than 5 μ, and the transmission rate of the system is 5 kHz. The quick response and stability of the data acquisition and protection system have been confirmed in practice.

Structure Design of Calorimeter of EAST-NBI System Using Thermal Inertia with Cooling Water

The calorimeter of Neutral Beam Injection (NBI) system of Experimental Advanced Superconducting Tokamak (EAST) must has better heat transfer ability to keep the system running stably and avoid thermal effect caused by a large number of high-energy particle deposition. The physical characteristics and engineering design factors of components was considered in the preliminary design of the structure. The calculation of surface softening temperature was carried out by numerical simulation of heat transfer, and the result verified the primary structure was suitable for the basic thermodynamic requirements of the target plate. This paper provides a reference for the safe and stable operation of EAST-NBI system.