Atomizing nozzle: Mechanical atomization mainly relies […]
Atomizing nozzle: Mechanical atomization mainly relies on the high-speed jet generated by the fuel under the pressure difference to atomize the fuel, which can be subdivided into direct-type, centrifugal and rotary atomization.
The direct atomizing nozzle and the centrifugal atomizing can be collectively referred to as pressure atomizing. Since the direct type mainly relies on the injection of fuel to achieve the purpose of atomization, the oil pressure requirement is relatively high, and the larger the nozzle diameter, the coarser the atomization. Therefore, the diameter of the nozzle hole should not be too large, and the flow adjustment range is relatively small. Centrifugal atomization is to use a centrifugal force generated by a high-pressure liquid through a swirling device to generate a liquid film, which is broken by air and atomized, and the effect of centrifugal atomization is better than direct radiation. Atomization, but it also requires higher oil supply pressure, so they are not suitable for atomizing highly viscous fuel.
Rotary atomization is roughly divided into two types: rotary body type and rotary nozzle type. The rotary shape is divided into a cup type and a rotary disk type. The cup type atomization is to spray fuel into the front end of the conical cup. The high-speed rotating rotor transforms the fuel into a film, and combines the functions of “centrifugal spray” and “speed spray” to atomize the fuel. It is mainly used in industrial furnaces and boilers in China.
Similarly, rotary atomizing is based on a high-speed rotating disc to atomize fuel. It is mainly used in the field of spray drying. The centrifugal oil pan used on the baffled burner of a small gas turbine is a typical rotary nozzle atomization. Its atomization quality is mainly due to the large centrifugal force generated by high-speed rotation. The attached fuel has a very high equivalent pressure, which makes the fuel radial velocity of the pumped fuel extremely high.