Box-type Emission The UAVs Gas Jet Impingement Effects Numerical Analysis

The unmanned aerial vehicle (UAV) is playing an important role in the modern local wars, and also has established the indispensable status in the future wars because of its diversity, information operations, high-performance. UAV box-type rocket-propelled launch system for its high flexibility, strong mobility, high degree of automation, hidden well, has improved the survivability of the UAV. So, UAV has obtained the widespread attention in various countries' researching work. But because the space of the container launching system is limited, the high temperature and high pressure fuel gas with complex physical property which was produced in the rocket-assisted firing process have a serious shock effect to the the launcher body, the automatic valve, and the diversion chamfer of flow field esc.The present paper based on a real UAV, the simplified model of the UAV launcher has been established. Taking the three-dimensional unsteady Euler control equations as the foundation, using the finite volume method, the numerical simulation to the UAV launching flow field has been carried on using the Roe format solution non sticky flux terms. In the numerical simulation process, First a supersonic jet impinging plate flow field test examples has been selected to show the effectiveness of numerical methods.On this basis, choosing different time points, the different position of UAV launcher have been analyzed to get the flux field distribution characteristic of the launcher body, the automatic valve, and the diversion chamfer of flow field. Then, the thorough study of block structure meshing technology and dynamic grid meshing update technology have been carried on. The launch system gas jet unsteady flow field have been dynamic simulated to get the dynamic continuous data of the testing point and compare with the static simulation results. The-analysis result could apply technical support for the UAV and some auxiliary equipment structure design and could provide the valuable reference data for engineering application.