Rotary Body Cavity Flow Field Numerical Analysis

The research in this paper has been supported by the Super-cavitating Hydro-mechanics Theory on the Super-velocity underwater weapon research program administered by the office of nation defense key lab fund (contract 99JS21.1.HKO302), and it is the important part of the program. The main work in this paper includes three parts: the theory research on partially-cavitating and super-cavitating axisymmetric bodies, the numerical computations and experimental investigations on partially-cavitation and super-cavitation on axisymmetric bodies.After finishing the study of theory and experiment on the partially-cavitation and super-cavitation for axisymmetric body, I use the potential flow theory to build the mathematical model on the partially-cavitation and super-cavitation for axisymmetric body. Many cavity wake models, such as Pressure recovery close model, Riabouchinsky model and Re-entrant jet model, are studied seriously. And the pressure recovery close model is suitable for the simulation of the cavitating flow on axisymmetric body. Then this model is chose to compute the cavitating problem.The panel method employs sources to solve the problem of partially-cavitation and super-cavitation for axisymmetric body. The sources are distributed on the bodies and cavity surfaces. According to the mathematical model and the numerical method, the cavity shape and hydrodynamic characteristics of two kinds of head shape on cavitating axisymmetric bodies at zero attack are computed in this paper. Because the discretization method have effect on the convergence of the results, different kinds of discretization are employed in the partially-cavitating and super-cavitating flows. Some results are compared with the other published numerical data. And the results are in good agreement with the presented ones. The speed of the convergence is very fast, and the results of the first iteration are very close to the convergent results.The cavity shape is determined by iterations. Other relative iterative methods are introduced in this paper.The experiment is finished in the tunnel of marine engineering college of the NWPU. The cavity inception, the developed cavitating shape and hydrodynamic characteristic are experimentally studied in this part.