Gas-assisted Atomization Mechanism And Experimental Research Of High Viscosity Liquid

The atomization of high viscosity liquid is an important academic field with broad industrial application. In boiler field, proper atomization of high viscosity liquid fuel is the essential assurance to safe .stable and high efficient combustion for boiler; in the propulsion equipment of rockers and turbo jet-propelled engine, the atomization quality of liquid fuel is the precondition to improve combustion efficiency and supply sufficient propulsion; in the field of industrial manufacture, metal powder is made by liquid metal which is impacted by high velocity gas; in the field of agricultural irrigation, the water with certain velocity is used to strike metal disk to make insufflations proportionally to the irrigation field; in the technique of desulphurization and coal gasification, proper design of nozzle is the essential factor to advance the efficiency of desulphurization and coal transformation.First, a minitype atomization test-bed, which is aimed at the research of atomization mechanism, is constructed. Compared with the 8t/h big test-bed, following advantages are available:1) Test-bed is qualified to measure every kind parameter in atomization process, and is hardly ever affected by the out disturbance.2) All the equipments should work smoothly, with convenient operation and small influence to surroundings.3) Safety attention should be considered during the experiment; most experimental pipe is soft with pressure.4) Test-bed is designed of well visualization and suitable space for operation.5) Nozzle can be arranged easily.6) Test-bed is also made to meet the requirement of laser arrangement in holographic measurement and interferometer.Secondly, the thesis summarizes the basic theories in atomization field and some experiments have been done to analyze the influence factors to gas-assisted nozzles. The laser particle sizer of type LS-2000 is used in the experiments to research the atomization performance. The areas of exit orifice of gas as well as liquid, the structure of exit orifice of gas, interaction areas between gas and liquid, the viscosity and surface tension of atomization liquid are inspected in the experiments. The results indicates that, gas-expending rate, We number of gas, and Z number, which is the reflection of energy expending rate, the quality of gas and physical character...