Simulation of internal flow field and aerodynamic characteristics of fuel cell cam hydrogen circulation pump
In order to reduce the vibration and noise generated by the operation of fuel cell hydrogen circulation pump,the basic theory of cam type hydrogen circulation pump was analyzed.Based on the establishment of a CFD simulation model for the internal flow field of a certain circulating pump,the following conclusions could be drawn through simulation analysis.Firstly,as the speed increased,the actual exhaust flow rate of the circulating pump gradually increased.Secondly,the error between the theoretical exhaust flow rate of the hydrogen circulation pump and the numerical simulation results was less than 4.4%,which could accurately reflect the law of gas pulsation inside the hydrogen circulation pump.Thirdly,when the rotating speed was 8 000 r/min,the internal leakage was the smallest and the volumetric efficiency was the largest.The rotating speed of the hydrogen circulating pump affected the internal leakage and thus the volumetric efficiency.And the frequency of pressure pulsation was negatively correlated with rotational speed,while the intensity of pressure pulsation was positively correlated with rotational speed.Therefore,it is necessary to choose an appropriate rated speed to avoid reducing work efficiency due to excessive speed.
NETL
NSTL
万方数据
