Volume 53

Optimised design of fuel cell hydrogen recirculation system based on ejector Jiaojiao Xie,Tiancai Ma,Xiuhui Jing

Abstract

With the advantages of simple structure, easy maintenance and low cost, the ejector is an ideal cycling device for proton exchange membrane fuel cells, but it is difficult to have a good performance at low power. Aiming at the problem that it is difficult to adapt the ejector to the circulation demand under full working conditions, this paper summarizes the general design flow of the fixed structure ejector by comparing the three design methods of one-dimensional computation, CFD simulation and algorithmic optimization, and describes the advantages and disadvantages of the various schemes by comparing the single ejector, a new structure of the ejector, a two-stage ejector in parallel, and a combination of the ejector and the hydrogen circulating pump for the hydrogen circulation. The advantages and disadvantages of each scheme are described, with a view to contributing to the research on the design of ejectors and hydrogen circulation schemes.

Keywords ejector, PEMFC, hydrogen recirculation