Numerical Simulation of Flow Field in Special-Shaped Rocket Launch Guider

When the rocket is launched, the excessive impact of the gas jet may cause damage to the special-shaped director. In this study, the computational fluid dynamics (CFD) method and the standard k-ε turbulence model were used to simulate the movement process of the rocket projectile in the tube through the overset grid technology. The evolution characteristics of the flow field in the special-shaped launch guider were systematically analyzed, and the distribution law of the pressure load on the tube wall was obtained. The results show that the gas jet forms a ‘fish scale’ structure under the influence of the inclined transition section of the special-shaped launch guider; until the rocket moves to the rudder groove, the maximum pressure on the cylindrical surface of the launch guider is 0.334 MPa. After the rocket passes through the rudder groove, the pressure on the inclined surface of the rudder groove gradually increases, and the maximum pressure is 0.528 MPa. Therefore, this is the where the working environment is the worst. This study can provide theoretical support for the structural design of the special-shaped launch guider.