Recently,the requirement for cooling capacity decreased when the driving energy changed from liquid fuel to lithium batteries.Therefore,the structure and location of the forecabin could be adjusted based on the aerody...Recently,the requirement for cooling capacity decreased when the driving energy changed from liquid fuel to lithium batteries.Therefore,the structure and location of the forecabin could be adjusted based on the aerody-namic performance.The current study conducted a significant number of simulations in order to find out the effects of the internal flow through forecabin in an Ahmed body.The following conclusions have been identi-fied:1,The flow through the forecabin would always increase the resistance of the entire body,and the drag coefficient increases,on average,by approximately 85%.2,When the aspect ratio is higher or the position of the inlet opening is lower,the total drag coefficient is lower due to a weaker vortex strength,a simpler vortex structure and a relatively simple flow.3,The existence of the forecabin will largely increase the oscillation fre-quency of the flow field by approximately 15 times compared to the original Ahmed model.Finally,the high drag coefficient moment always appears to be due to the formation of more complex or intense vortex motion.These conclusions can offer useful results and references for the structural design of the front cabin for new energy vehicles.展开更多
基金The authors would like to acknowledge the support from NSFC 91741203 which allowed the research project to be conducted.The authors also would like to acknowledge the support from NSFC-RS Joint Project under the grant number no.5151101443 and IE/151256。
文摘Recently,the requirement for cooling capacity decreased when the driving energy changed from liquid fuel to lithium batteries.Therefore,the structure and location of the forecabin could be adjusted based on the aerody-namic performance.The current study conducted a significant number of simulations in order to find out the effects of the internal flow through forecabin in an Ahmed body.The following conclusions have been identi-fied:1,The flow through the forecabin would always increase the resistance of the entire body,and the drag coefficient increases,on average,by approximately 85%.2,When the aspect ratio is higher or the position of the inlet opening is lower,the total drag coefficient is lower due to a weaker vortex strength,a simpler vortex structure and a relatively simple flow.3,The existence of the forecabin will largely increase the oscillation fre-quency of the flow field by approximately 15 times compared to the original Ahmed model.Finally,the high drag coefficient moment always appears to be due to the formation of more complex or intense vortex motion.These conclusions can offer useful results and references for the structural design of the front cabin for new energy vehicles.
