Abstract:In order to solve the structural safety design problem of the thermal launch of the marine launch device, and to clarify the impact of the jet impact on the marine launch device during the thermal launch process, the study focused on the characteristics of the plume flow field of the single-nozzle rocket engine. The computational fluid dynamics method was used based on the k-ω shear stress transfer (SST) model is used to numerically simulate the three-dimensional single-nozzle engine at different flight heights, and the variation law of the temperature, velocity and pressure of the plume flow field during the launch process with the launch height is obtained. The simulation results show that the distance between the nozzle outlet and the deck has an important influence on the shock structure of the flow field. When the distance exceeds 5de, the temperature and velocity of the rocket wake drop rapidly, and the jet recovers the environmental pressure of the deck at 30de. The research and simulation results can provide experimental reference and theoretical basis for the subsequent safety design of offshore launch platforms and the innovation of diversion devices.