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Development Of Atomizing Nozzle Technology
Sep 15, 2018

Development of atomizing nozzle technology

1 preface

Skills are now almost all industrial categories, such as transportation, agricultural production, and the usual days of citizens, in addition to the burning of various fuels (gas, liquid and solid fuels), atomization skills in non-burners

Industries such as catalytic granulation, food processing, powder coating, and pesticide spraying are also widely used. This article is primarily about a brief introduction to the atomization skills of liquid fuels.

 

2 The mechanism of atomization of liquids The so-called atomization of liquids refers to the physical process of liquids becoming liquid mist or other small droplets in a gaseous environment under the effect of external energy. Regarding its atomization mechanism, various explanations have been made, such as aerodynamic disturbance, pressure and vibration, turbulence disturbance, air disturbance, sudden change of boundary conditions, etc., which are now introduced as follows 1~3.

 

2.1 Aerodynamic disturbance

 

Castleman first proposed aerodynamic disturbances. He thought that because of the aerodynamic interference between the jet and the surrounding gas, the appearance of the jet was unstable and shaken. With the addition of speed, the effect of the unstable wave is shorter and shorter, and up to the order of micrometers (m), the jet is scattered into a mist.

 

2.2 Pressure oscillation says

The pressure oscillation is said to observe that the pressure oscillation of the liquid supply system has a certain influence on the atomization process. Therefore, pressure oscillations are generally present in the conventional eruption system, and thus it is considered to have an important effect on the atomization.


2.3 turbulence disturbance

Turbulence disturbances say that the jet atomization process occurs inside, and the fluid's own turbulence can play an important role. It has also been suggested that the radial velocity of the fluid within the nozzle as a turbulent tube flow will immediately cause a disturbance at the nozzle exit and then atomize.

 

2.4 Air disturbance theory

The air disturbance says that the turbulence disturbance is opposite, and that the large amplitude pressure disturbance caused by the cavitation appearance in the injection system is the cause of the atomization.

 

2.5 Boundary conditions change suddenly

The sudden change of boundary conditions means that the boundary condition (internal stress) of the liquid is suddenly changed at the exit of the nozzle; or the laminar jet is excellently lost in the wall surface of the nozzle, so that the velocity spread in the cross section is suddenly changed and the atomization is atomized.

The five nozzle mechanism assumptions listed above have deficiencies, and even they are opposite each other. Most experts, such as Bracco F V et al. 1~2, support the aerodynamic disturbance. This hypothesis is carried out in a relatively rich and better manner.

Explain the reason for the low-speed jet splitting and breaking, so as to infer the high-speed jet, which can be used as the root cause of atomization. At present, the research on the mechanism of fuel spray atomization at home and abroad is mainly carried out from two aspects: one is to use numerical calculation skills to establish a variety of hypothetical models for numerical modeling research 4~6; on the other hand, using leading photoelectric testing skills to capture atomization The details of the process to support the assumptions of some or induction.

 

2.3 turbulence disturbance

Turbulence disturbances say that the jet atomization process occurs inside, and the fluid's own turbulence can play an important role. It has also been suggested that the radial velocity of the fluid within the nozzle as a turbulent tube flow will immediately cause a disturbance at the nozzle exit and then atomize.

 

2.4 Air disturbance theory

The air disturbance says that the turbulence disturbance is opposite, and that the large amplitude pressure disturbance caused by the cavitation appearance in the injection system is the cause of the atomization.

 

2.5 Boundary conditions change suddenly

The sudden change of boundary conditions means that the boundary condition (internal stress) of the liquid is suddenly changed at the exit of the nozzle; or the laminar jet is excellently lost in the wall surface of the nozzle, so that the velocity spread in the cross section is suddenly changed and the atomization is atomized.

The five nozzle mechanism assumptions listed above have deficiencies, and even they are opposite each other. Most experts, such as Bracco F V et al. 1~2, support the aerodynamic disturbance. This hypothesis is carried out in a relatively rich and better manner.

Explain the reason for the low-speed jet splitting and breaking, so as to infer the high-speed jet, which can be used as the root cause of atomization. At present, the research on the mechanism of fuel spray atomization at home and abroad is mainly carried out from two aspects: one is to use numerical calculation skills to establish a variety of hypothetical models for numerical modeling research 4~6; on the other hand, using leading photoelectric testing skills to capture atomization The details of the process to support the assumptions of some or induction.


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