Fuel cell wide-area injector design method and device

Abstract

The invention discloses a method and apparatus for designing a fuel cell wide area ejector. The method comprises the following steps: obtaining fuel cell stack parameters and working conditions; establishing a steady-state characteristic equation of fuel cell ejector and the characteristic equation of ejecting fluid with water. The steady-state characteristic equation of fuel cell ejector and thecharacteristic equation of ejecting fluid with water are coupled into the mathematical model of fuel cell ejector. The available load range of the ejector is predicted by using the model, and the hydrogen ejection performance curve in the available load range of the ejector is obtained. The initial parameters are determined in order to optimize the nozzle diameter, mixing chamber diameter / nozzle diameter, mixing chamber length / mixing chamber diameter, nozzle location size of the parameter values. This method takes into account both the performance improvement and the widening of the availableload range in the ejector parameter optimization design phase, and provides an effective way to design hydrogen ejector with a wide range of available load range, which provides an effective way to solve the problem that the fuel cell ejector has a narrow working load range.

Description

Technical field [0001] The present invention relates to the technical field of proton exchange membrane fuel cells, in particular to a design method and device of a fuel cell wide-area ejector. Background technique [0002] Proton exchange membrane fuel cells have high efficiency, low emissions, and no pollution. They are suitable for vehicle use and have received widespread attention. In the fuel cell system, hydrogen gas supply is very important, which is related to whether the fuel cell is short of gas and the liquid water on the hydrogen side is purged. In the working mode of the conventional anode blind end, the problem of anode drainage is more serious, anode flooding is prone to occur, and the anode is prone to lack of gas during the variable load process. The occurrence of flooding and gas shortage will not only affect the normal use of the fuel cell stack, but also seriously affect the durability of the fuel cell. In order to solve the defects of the blind end mode and...

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Problems solved by technology

However, the use of these technical solutions itself will weaken the advantages of the ejector application, and the application in the system has certain limitations

In addition, in the ejector design process, insufficient consideration of the operating parameters of the fuel cell stack and the system also leads to deviations in performance simulation results and cannot predict the available load range of the ejector, and cannot be used in the design of ejector parameters. stage broadens its load range using

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