The hydrogen circulating pump is an essential component of hydrogen fuel cell systems. It
plays a vital role in improving hydrogen utilization efficiency and optimizing hydrothermal …

It is widely acknowledged that rotary positive displacement machines exhibit highly
unsteady flow fields that affect their performance. The presence of the operational …

This study uses conjugate gear theory to mathematically model the cycloid rotor profile of a
Roots pump. After the rotor profile is generated based on the mathematical model of a rotor …

Multi-stage vacuum pumps are commonly used to increase pump efficiency, and several
kinds of Roots rotor profiles have been proposed. However, the lack of design flexibility for …

This study develops a new lobe pump rotor profile that significantly improves pump
performance. Rotor profiles including two traditional designs and two new designs consist of …

Multi-stage Roots dry vacuum pumps are widely used in the semiconductor industry,
metallurgy, pharmaceuticals, solar photovoltaic, thin film equipment, and other such fields …

ABSTRACT A three-dimensional computational fluid dynamics (CFD) model of a Roots
blower with a backflow design was established to analyse the effects of the backflow on the …

Based on an analysis of a three-stage design with varying phase angles, this paper
proposes a method for improving pump performance in multistage Roots pumps by …

The rotor profile is one of the key factors for improving the performance of the Roots vacuum
pump. A novel elliptical rotor profile consisting of the elliptical arc and its conjugate curve is …

A new flow fluctuation abatement method based on noncircular gear variable speed drive is
proposed and the mechanism principle of variable speed lobe pump is expounded …