Abstract
In the process of stage separation of recoverable liquid launch vehicles,because of the large amount of residual fuel in the storage tanks,the influence of liquid sloshing on separation safety must be considered.Considering calculation simplicity and operation practicability,the Mov-ing Pulsating Ball Model(MPBM)of large amplitude liquid sloshing is introduced into the calcu-lation of launch vehicle stage separation.Combining the dynamic equation of the model with the energy relationship during"breathing movement",the formula calculating the force of liquid on the rigid body is derived.Compared with the calculations of commercial CFD calculation software,the accuracy of MPBM model is verified.Then,all the external forces and moments are applied to the rigid body of the stages,so that the translational and rotational dynamic equations of the stages are obtained respectively.According to the relative position of the two stages,the geometric shape of the interstage section and the engine of the second stage,the minimum clearance in the separa-tion process can be decided to guarantee that the separation process is safe.
基金项目
National Natural Science Foundation of China(12132002)
National Natural Science Foundation of China(12202044)
NETL
NSTL
万方数据