Roots pumps play a crucial role in hydrogen fuel cell systems. As the textile industry seeks sustainable power solutions to achieve carbon neutrality in manufacturing, hydrogen energy has emerged as a promising alternative for clean energy supply. However, existing Roots pumps designs still fall short of delivering superior overall performance , i.e., the capability to achieve high volumetric efficiency and low flow pulsation simultaneously . This paper first summarizes the general design methodology and geometrical constraints for rotor profiles. Subsequently, a method for determining key design parameters from these geometrical constraints is proposed. Using this methodology, the circular arc rotor, hyperbolic rotor and parabolic rotor profiles are designed. In order to simultaneously meet the requirements for high volu metric efficiency and low flow pulsation, a novel profile composed of arc, parabolic, and their conjugate curve segments is proposed. Numerical simulations reveal that the proposed rotor achieves the highest volumetric efficiency and the lowest flow pulsat ion, demonstrating its potential for improving the performance of hydrogen circulation in fuel cell systems. Flow field analysis revealed that the intensity and scale of the vortices generated at the junction between the two rotor profiles are the root cau se of flow pulsation.

textile industrial application , hydrogen circulating pump, new design formula, solution of design parameters, novel rotor profile