This study focuses on a hydrogen ejector for a proton exchange membrane fuel cell
(PEMFC) with a maximum power of 150 kW. Experimental tests were conducted to
obtain the operating parameters of the stack under 100 kW and 150 kW conditions,
which were used as simulation boundary conditions. A three-dimensional numerical
model of the ejector was established and validated. Based on this model, the
effects of key structural parameters—including nozzle throat radius
(Rnt), nozzle position (NXP), mixing chamber
radius (Rm), diffuser outlet radius
(Rde), secondary flow inlet radius
(Rs), suction chamber radius
(Rf), and constant-pressure mixing chamber
length (Lpm)—on ejector performance were
systematically analyzed. The results indicate that
Rnt and Rf are
negatively correlated with ejector performance, while
Rs and Lpm are
positively correlated. In contrast, NXP, Rm, and
Rde exhibit an optimal range, leading to a
single-peak characteristic in ejector performance. This research provides a
theoretical basis and design reference for the structural optimization of
high-power fuel cell ejectors.
