Reverse The Cavitation Structure Based On The Internal Fields And Research The Influencing Factors Of The Cavitation Process

Generally, cavitation refers to: “liquid was acted by a certain flow, with pressure dropping. When the pressure inside the local area dropped to a certain degree, Pressure induced vapor bubbles appearance, development, explosive growth. Then under the external pressure, vacuole crushed, disappeared, and dissolved into the liquid. This process was repeated cycle, which formed cavitation occurs, growth, development, and the largest collapse, regeneration until finally disappeared.Cavitation bubble collapse process will release tremendous energy, generate point high temperature and high pressure, which bringing an exciting prospect. It is widely used to strengthen the chemical process, strengthening mechanical process, surface cleaning, material cutting and ground excavation, etc. In addition it also can enhance the properties of metal materials, vacuoles boat, cavitation broken stones, oil viscosity degradation, breathing gas source and many other aspects of the application.To take full advantage of the cavitation technology, to find out inner structure of cavitation, influence factors of the cavitation intensity, the process of energy release during cavitation, the stress distribution of the cavitation in the operation and other issues. In this paper, with the help of ANSYS-Fluent software, it is currently used by most extensive CFD software, because it’s high efficiency, low cost, applicability, and other characteristics. We simulated the cavitation flow inside the multiple swirling-Venturi combined cavitator, extracted cavitation flow laws, and obtained the result contours of cavitation process. Comparative evaluation criteria was established, compared the simulation results with the results of comparative experiments of methyl violet, original data flow field contours. The cavitation internal fluid structure size was obtained, finally cavitator real internal structural sizes were obtained. Based on the previous analysis, influence of physical parameters, structural parameters, operating parameters on the cavitation intensity were researched. We analyzed the impact of different types of cavitator on cavitation intensity. Then we obtained the optimum structure. Finally Cavitation device for optimal structural stress analysis was carried out. Some results obtained are listed below:(1) Based on ANYSS-Fluent software, we establish a method by reversing flow distribution inside the device to obtain the device structure size.(2) Based on ANYSS-Fluent software, combined with the k ?? turbulence model and cavitation theory. We were carried out cavitation flow analysis in the cavitation, and find the basic laws of cavitation flow.(3) The impact of necking diameter on cavitation intensity, which exists an optimum diameter of 26 mm.(4) The impact inclined holes diameter on cavitation intensity, which renders parabolic law.(5) With the inlet pressure rising, and the outlet pressure under the same circumstances, the entrance to the exit pressure drop becomes larger. It is more beneficial to cavitation intensity.(6) The effect of temperature exists both sides, maximum cavitation intensity appears near 40 ℃.(7) In the appropriate range, with the initial vapor volume increasing, cavitation intensity is growing.(8) It showes tension almost has no effect on the cavitation intensity.(9) The structural break of cavitation is the more dramatic, the greater the intensity of cavitation.(10) Provided the material, Based on fluid-structure coupling analysis,the structural safety of the cavitation generator is proved.