科研之友
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摘要
The pumps are generally designed and are selected based on performance under uniform inflow with the straight pipe, but actually non-uniform suction flow occurs at the inlet of the reactor coolant pump due to the complex geometry in the channel head. It is sorely necessary to research the unsteady characteristics of the pumps with uniform and non-uniform inflow. In this paper, CFD approach is employed to analyse the inlet and outlet pressure pulsation characteristics of reactor coolant pumps with different inflows. The channel head induces non-uniform flow in the pump inlet, while straight pipe is with the uniform inlet flow. Meanwhile, the pressure pulsations at positions of the inlet and outlet with different inflows are investigated. And pressure pulsation signals are analysed using FFT, RMS and Peak-to-Peak Value methods. The differences of the pressure pulsation and its characteristic between the channel head and straight pipe at the inlet and outlet are obvious due to the different inflows of channel head and straight pipe. The pressure amplitudes of fR, fRPF, 2fRPF, 3fRPF, 4fRPF, 2fSPF are analysed, and the predominant components of the inlet and outlet in pressure spectra locate at 2fRPF. Further, the non-uniform inflow leads to the offset of the X radial force and the Y radial force, which leads to the increasing of the asymmetric degrees of radial force. The non-uniform inflow increases the radial force at low frequency. In a word, it is expected that the present work provides a different view of designing pumps with the consideration of non-uniform inflow. It is very important to accurately evaluate the hydrodynamic characteristics with non-uniform inflow because of the safety of the nuclear reactor. In further study, experimental investigation on the pressure pulsations of the reactor coolant pump with channel head and straight pipe will be conducted and flow field of the inlet will be measured by PIV as well.
- 出版日期2017-8-15
- 单位上海交通大学
