Effect of pressure ratio on transient flow in hydrogen circulating pump

A Review of the Research Progress and Application of Key Components in the Hydrogen Fuel Cell System

“…With the help of computational fluid mechanics and experimental techniques, some scholars have deconstructed the internal flow field of the pump and explored the internal flow characteristics of the Roots pump. Li et al [83] used computational fluid mechanics and experimental verification methods to study the Roots hydrogen circulating pump under different pressure ratio conditions, which showed that change in the pressure ratio makes a difference to the flow mode in the hydrogen circulation pump chamber, and the gap leakage flow scale increases with the pressure ratio. Kong et al [84] put forward a new structure of a reflux groove to inhibit the pressure pulsation of the Roots pump and analyzed the mechanism of the reflux groove on the pressure pulsation, flow pulsation, and volume efficiency at different rotational speeds.…”