Numerical Analysis Of Static And Dynamic Flow Characteristics Of Cavities And Fluid -structure Interaction Of The Store Separated From Cavities In High Mach Number

The cavity structure is a simple shape, but it can be occurred a very complex flow characteristics, w hen t he gas flow through the cavity. The flow characteristic is widespread researched over the world. In special, when the g as f lows through the cavity in supersonic velocity, the boundary-layer can be separated from the cavity of the front wall, and emerge expansion wave in the front wall, as well as shock wave in the after wall. Hence,since the gas strikes the cavity and the after wall, the strong noise and vibration can be occurred, it also can lead to the vibration of the electronic equipments and the fatigue damage of the structures.This paper analyzes the results between the computing data of different turbulent model with that of the experimental data in high Mach number. It is founded that the k ?ωturbulence i s better t han others i n the results of simulating the f low characteristics of the cavity.This paper researches the flow characteristics of the different length-depth ratio cavity in Mach 2.16 and 2.86 and the angle of the after wall with 0, 30.2 and 38.7. It includes that: (1) The static flow c haracteristics. This paper is calculated the f low characteristics of the different length-depth ratio with different angle of the after wall, the pressure coefficient d istribution for the d ifferent length-depth ratio and angle of the after wall a re discussed, which can be used to determine the type of flow in t he cavity. (2) The dynamic flow characteristics. There is a large reverse flow in open cavity. Hence the dynamics flow characteristics for three different length-depth ratio cavity are analyzed, as well as the pressure oscillation and noise for the open cavity in different mach and angle.