Study on the influence of different localized large heat flow positions on self-pressurization process of liquid hydrogen tank for vehicles
The liquid hydrogen has attracted significant attention in the field of hydrogen vehicles due to the advantages of high hydrogen storage density and good safety performance,especially in the application of long-distance and large-scale transportation for vehicles.As one of the core components of liquid hydrogen fuel vehicles,the vehicle-mounted liquid hydrogen bottle will directly affect the driving range of the vehicle.In the pipeline structure design of liquid hydrogen tank for vehicles,there is a localized large heat flow at the connection between the pipeline and the inner container,which has a significant impact on the non-destructive storage time of liquid hydrogen tank.In this paper,a three-dimensional numerical model is established.Under the premise of the same total heat leakage,the influence of three localized large heat flow positions at the top,middle and bottom and the uniform heat leakage conditions on the thermophysical field variation during the self-pressurization process of liquid hydrogen tank are numerically studied.The results show that the average pressurization rates within the 1000 s are 4.51,3.01,15.08 and 6.08 kPa·h-1,respectively for the uniform heat leakage and the three localized large heat flow conditions at the top,middle,and bottom.Since the pressurization rate is the slowest under the top large heat flow condition,and the fastest under the middle large heat flow condition,it is recommended to set the connection position at the top of the inner container when designing the connection position between the pipeline and the inner container,so as to extend the non-destructive storage time of liquid hydrogen tank.
liquid hydrogen tank for vehicleslocalized large heat flowtemperature fieldpressure variationphase change
万方数据
维普
