Effect of suction temperature on the internal flow characteristics of hydrogen circulation pump

Abstract

This paper explores the effects of suction temperature (ST) on the internal flow and pressure pulsation characteristics of a roots hydrogen circulation pump (HCP). The study analyzes the suction and discharge chamber pressure pulsation, as well as the inlet and outlet flow pulsation, at different STs. The research finds that an increase in ST leads to a decrease in the amplitude and fluctuation intensity of the pressure pulsation in both suction and discharge chambers. Moreover, the average flow rate of the HCP decreases with increasing ST, while the frequency and waveform remain unchanged. The maximum and minimum values of the inlet flow pulsation decrease, while the maximum value of the outlet flow pulsation decreases, and the minimum value increases, indicating a reduction in fluctuation intensity. The turbulent energy within the discharge and transport chambers also changes with increasing ST. The inter-lobe leakage flow (ILF) is slightly affected by ST, while the radial leakage flow (RLF) and axial leakage flow (ALF) exhibit slight increases. Overall, these findings reveal the importance of considering ST as a critical design parameter for optimizing the performance and stability of the HCP.