دانلود رایگان مقاله آنالیز حرارتی-هیدرولیک پوسته شدن ماژول هدف در ADS

Abstract

As a key component in Accelerator Driven System (ADS), the spallation target is exposed to high irradiation intensity radiation, and a larger amount of heat is deposited on it. Therefore, the cooling of the target is a challenging task in the target design. Integrated target module with a solid beam window, and cooled by reactor primary coolant is a good contender for ADS system. The numerical analysis of two target modules was performed by using finite element code to assess the target cooling capacity. It was found that with uniform inlet velocity, the geometry modification of the inlet could improve the heat transfer effectively. But with non-uniform inlet velocity, the geometry modification of the inlet had little effect on cooling capacity.

6. Conclusion

Due to the intense heat deposition and the limited space in the reactor core, the target geometrical configuration and the inlet flow distribution had been carefully designed to ensure adequate coolant velocity for cooling the target material. CFD analyses were performed to define the velocity and the temperature distribution in the window and the coolant bulk. The results achieved are summarized as follows: In the uniform inlet condition, the maximum temperature on the window of the typical design is 1255.5 C. With same mass flow rate, the maximum temperature on the window of the proposed design is reduced to 846 C. While an increase in the inlet velocity to about 3 times, the temperature difference has reduced by 40%. The inlet flow velocity is an important design parameter affecting the window temperature. The divided inlet schemes can effectively reduce the maximum temperature on the window. The maximum temperature change on the window in the nonuniform inlet velocity is complicated. The proposed target can get same temperature with small mass flow rate. The velocity near the window is the main influence of the window temperature. And the maximum temperature on the window reduces with a rise in the velocity near the window surface. Further, the methods to increase the velocity on the window are being investigated by numerical simulation.