Effect of thermal deformation on leakage clearance of claw hydrogen circulating pump for fuel cell system

Key Words:SCREW COMPRESSOR; TEMPERATURE; EFFICIENCY; ROTORS; DESIGN

Abstract:The leakage clearance have a strong impact on the performance and reliability of hydrogen circulating pump in a fuel cell system, and the thermal deformantion is the most signifi-cant factor because of its high working temperature, small size. In this paper, the distri-bution of leakage clearance with different temperatures and rotors materials is obtained. The radial leakage clearance decreases with the increase of temperature in the working chamber. The axial clearance is increased by about 100 mm at rated working condition. When the material of rotors is aluminum alloy, the minimum radial clearance under rated working condition is about 8.5 mm, and the risk of interference is large. When the material of rotors is structural steel and titanium alloy, the radial clearance is maintained above 30 mm, and the risk of interference is small. The variation of leakage clearance leads to the variation of leakage area. The variation of total leakage clearance first increases and then decreases with the increase of angle. The minimum variation of total leakage area is 6.25 mm2 at 0 degrees and the maximum is 7.578 mm2 at 84 degrees. The total leakage area increased by 7.144 mm2 on average. The results can be used as guidelines for the structural optimization of hydrogen circulating pump.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Volume:47

Issue:66

Translation or Not:no