Research Of Hydrodyamic Cavitation Generrating Device

Cavitation is the process of formation, development and collapse of vapor or gas cavity (hole) which occured in the liquid-solid the junction surface or liquid internal, is a very complex fluid dynamics phenomena. When the vacuoles move and collapse in a liquid,it can produce transient high-temperature, high-pressure liquid movement and collapse, and accompanied by a strong shock wave and high-speed jet, this feature can also be difficult to achieve chemical reaction in the so that under normal conditions to be realized, as we use. For example:means for cleaning, a cavitating water jet cleaning method is particularly effective in cleaning the precipitate of hydrocarbon, in this environment, an organic compound greatly decreasing, while the inorganic compound may also be oxidized to reduce; for material cutting, rock crushing and plugging wells; ultrafine grinding for materials; used to improve the surface properties of the material; promote chemical reactions.The chemical effects of cavitation water jet performance direct thermal decomposition of free radical oxidation and supercritical water oxidation and so on, using cavitating water jets produced by physical and chemical effects of sewage treatment will open up a new water treatment technology new areas of technology.To explore the mechanism of cavitation, cavitation research occurred the optimized design of the device, to seek the best structure parameters occurred hydrodynamic cavitation device developed to provide a theoretical basis and guidance. Devices using high-speed photography, using image processing methods, experimental porous orifice generator hydraulic cavitation process, to obtain the desired optimum parameters of design hydraulic cavitation apparatus through experiments summarized.According to the structural design of the standard orifice model designed twelve porous orifice plate. There is a difference from Twelve porous orifice respectively arranged in the opening ratio, the hole diameter, number of holes, the hole, whether there is the central bore.Using these porous orifice plate to do hydraulics test, by image processing, using the average gray value to explore the impact of the structural parameters of the porous orifice plate hydrodynamic cavitation effects.The results show that, cavitation effects of the pipeline can obtain a good evaluation by average gray value of a good evaluation; By two kinds of different ways of changing the opening ratio by changing the pore size and changing the number of holes, the same opening ratio is obtained, to obtain different corresponding to the average gray value of the pipeline, to change by changing the aperture opening rate cavitation effect is more obvious. The opening rate is too low, is not conducive to the generation of hydrodynamic cavitation effect, on the contrary, due to the existence of local resistance loss, excessive energy loss, but will cause cavitation effect is not obvious, cavitation occurs flow area smaller. In the same opening ratio, Orifice center cutout and different hole arrangement can cause the different of the cavitation flow zone occurs、the maximum volume flow, especially for the impact of the loss of local resistance is particularly evident, to lead different cavitation effect.