Design Of 35MPa Fully-wrapped Composite Cylinder For Vehicle And Numerical Simulation On The Temperature Rise During The Filling Process

In order to reduce the weight of the natural gas cylinder for vehicle and increase the mileage of natural gas vehicle,the 35 MPa fully-wrapped composite cylinder for vehicle is designed in theory.According to the relevant standards and technical targets,combined with the geometric constraint conditions of the cylinder,the structure design of the liner of the composite gas cylinder is carried out,including the lenth-diameter ratio of head,thickness of liner,diameter of the liner and diameter of nozzle.Based on grid theory and requirement of filament winding process,The filament winding layer is designed,including the winding angle,thickness and number of plies of the composite layer.In order to verify whether the composite cylinders meet the strength requirements under different working conditions,according to TSG R0006-2014,the design of the filament wound composite cylinders should adopt the stress analysis method.The characteristic functions and application procedure of the ACP(ANSYS Composite PrepPost)in dealing with composite structures were introduced,For the first time at home,the ACP module of ANSYS Workbench platform is applied for geometric modeling and stress analysis of glass fiber fully wound composite cylinders.According to GB 24160-2009 design criteria,the optimal self tightening pressure of the cylinder was obtained through optimization design,and stress analysis was carried out under auto-frettage pressure,zero pressure,working pressure and the minimum design burst pressure.Finally,the accuracy of ANSYS ACP modeling is verified by comparison between the experiments presented in the literature and the results of the ANSYS ACP.Considering the temperature sensitivity of the composite layer,the use temperature of the cylinder is not more than 82? according to the GB24160-2009.In this paper,a numerical calculation model of the temperature rise for composite cylinders is established by Fluent17.2,The temperature rise of cylinders during inflating process is numerically calculated by using the model,and the temperature distribution of gas and wall in cylinde is obtained.The results show that after the completion of gas charging,the maximum temperature of the composite layer on the cylinder does not exceed the allowable temperature range of the composite cylinder,which can prove the safety of the inflation under this working condition.Finally,the same method is applied to the finite element analysis of a large capacity gas cylinder for tube trailer during the filling process,and it is compared with the experimental results of the large capacity gas cylinder to verify the accuracy of Fluent17.2 modeling.