Dynamic Analysis About High-speed Entry Water Of Rocket Sled Water Brake Structure

In this paper, the high-speed water entry load characteristics and Splashing water status of rocket sled's water brake structure were introduced by using LS-DYNA software. In the first part, the water-entry research history and development of structure at home and abroad were reviewed, and the significance was emphasized. According to solid-fluid interaction's algorithm of ANSYS/LS-DYNA finite element computational procedures, a simulation analysis was made, which chiefly analyzes the high-speed water entry dynamic response characteristics of rocket sled. Based on the analysis, water splash and pressure-wave emission, the resistance characteristics, the speed curve and acceleration curve are all obtained. Especially, a very clear physical image about splashing water phenomenon was given, which was caused under conditions of high-speed impact. Splash water has a great impact on the upper blade of water brake, and also poses greater influence on the water funnel device. However, the issue about it was seldom considered in the previous studies. In short, a new methodology and technical reference for the design of rocket sled water brake structure were offered by the result of this study. The above numerical simulation results provided certain reference value for the design of high-speed water entry rocket sled water brake structure.