Nozzle atomization technology covers almost all industrial fields, such as transportation, agricultural production, and people's daily life. In addition to the combustion of various fuels (gas, liquid and solid fuel), nozzle atomization technology in non-combustion industries such as catalysis Granulation, food processing, powder coating, and pesticide spraying are also widely used. The nozzle atomizing technology for liquid fuel is briefly introduced.
The so-called atomization of liquid refers to the physical process of liquid becoming a liquid mist or other small droplets in a gaseous environment under the action of external energy. For its atomization mechanism, there have been many explanations, such as pressure oscillation theory, aerodynamic interference theory, air disturbance theory, turbulence disturbance theory, and sudden change of boundary conditions, which are briefly introduced as follows:
The pressure oscillation is said to observe that the pressure oscillation of the liquid supply system has a certain influence on the atomization process. Thus, pressure oscillations are prevalent in general injection systems and are therefore considered to play an important role in atomization.
Castleman first proposed aerodynamic interference, he believes that due to the aerodynamic interference between the jet and the surrounding gas, the surface of the jet is unstable. As the speed increases, the surface length of the unstable wave is shorter and shorter, up to the order of micrometers, and the jet is dispersed into a mist.
The air disturbance said that it has the opposite attitude to the turbulence disturbance, and believes that the large amplitude pressure disturbance generated by the cavitation phenomenon in the fuel injection system is the cause of atomization.