运载火箭注气式蓄压器联通孔流量特性数值仿真研究

The vertical mainstream flow has an impact on the lateral flow inside the communication port in a launch vehicle gas-filled accumulator，which may cause a marked deviation if the classical one-dimensional hy⁃ drodynamics method is used to calculate the flow characteristics of the communication port. The problem is stud⁃ ied by conducting three-dimensional steady-state numerical simulation on flow inside a single communication-port with different mainstream velocities，using Computational Fluid Dynamics method. It is found that the flow inside communication port has the characteristics of both T-branch tube flow and orifice flow. Affected by the ver⁃ tical mainstream flow，the flow inside communication port shows obvious asymmetry and nonlinearity，as the rela⁃ tive variation of the flow coefficient may exceeds 15% when the velocity ratio is less than -2.54 or greater than 1.29. Based on these simulation results，fitting formulae are given to estimate the charge and discharge flow coeffi⁃ cients of the communication port with different mainstream flow velocities，also the relationship between the rela⁃ tive variation of the flow coefficient and the velocity ratio.