Research On The Performance Of Proton Exchange Membrane Fuel Cell Based On Marine Vibration

In recent years,the world is facing severe air pollution and energy shortages.As a clean and efficient power generation device,fuel cells have been rapidly developed and popularized,and are considered to be the best alternative to non-renewable energy.There are many types of fuel cells,among which PEMFC(Proton Exchange Membrane Fuel Cell,PEMFC)has great potential for development due to its advantages such as high energy conversion efficiency,zero pollution,low vibration noise and good stability.Further,the development potential is huge.In order to realize the application of PEMFC as a power source on ocean-going ships,this paper mainly studies the influence law of ship vibration on the performance of PEMFC,so as to provide reference basis for the subsequent development of marine proton exchange membrane fuel cell technology.First,this paper summarizes the research background of this subject and vibration on the influence of proton exchange membrane fuel cell research status at home and abroad,aiming at this topic research direction,according to the structure and principle of PEMFC with fluid dynamics model,the electrochemical model,polarization model for the analysis to explore the internal components of PEMFC between heat transfer and chemical reaction process,by comparing several numerical simulation methods to choose Fluent PEMFC model for simulation analysis.Second,according to the research content to explore the applying method,the simulation model of ship vibration load summary of ship vibration mode,the Fluent software in a sliding mesh technique and a custom function(UDF)macro DEFINE_ZONE_MOTION innovative integration put forward a method of ship vibration loading ZM-UDF,this method can define different vibration characteristics: direction,vibration frequency and amplitude.Then,a 3d geometric calculation model of numerical simulation was established to verify the rationality and effectiveness of the proposed ZM-UDF by comparing the steady-state and transient voltage output changes of PEMFC through model verification.Finally,according to the vibration characteristics of the ship,the performance change rules of PEMFC under different vibration conditions were studied,and the ZM-UDF was used to load different vibration directions,frequencies and amplitudes,and the change rules of the velocity field,reaction gas distribution,water distribution and battery performance curve of PEMFC were summarized.The results show that the influence of ship vibration on PEMFC performance is vectoring,mainly in the case of vertical vibration with the most obvious drop in battery performance and 3.2% decrease in output voltage.Then,different vibration frequencies were changed based on vertical vibration.With the increase of frequency,the distribution of reaction gas in PEMFC tended to be uniform,and the performance of PEMFC was gradually transformed from weakening to strengthening.When the vibration frequency is 1Hz,the performance decreases by 7.9%.When the vibration frequency is 20 Hz,the performance is improved by 0.48%.Similarly,the ZM-UDF method was used to summarize the influence law of PEMFC vibration amplitude and quantify the influence law of vertical vibration amplitude.It was found that the voltage output was the best and PEMFC performance was improved by 0.5% when the amplitude and frequency were 1mm and 2Hz.