Single-way pressure spray pump head and double-way spray pump head

 

The working principle of the single-channel and dual-channel pressure of the spray pump head

The single-way pressure spray pump head is also called a simple centrifugal nozzle. As the name suggests, it uses the swirling parts in the nozzle to generate liquid rotation, accelerates the spray in the converging channel, and diffuses the cone-shaped oil film by using the high-speed difference between the liquid and the outside air. And broken, atomized. Among them, the centrifugal force of the swirl is used, so the swirl is a key part. The cyclone chamber and nozzle connected to the cyclone (sheet) are equally important. They can be combined into one (collectively referred to as atomizer), or they can be separated into a single-piece combination.

There are two oil circuits (main and auxiliary oil circuits or primary and secondary oil circuits) in the double oil pressure spray pump head for oil supply. When the amount of fuel supplied to the combustion chamber is small, that is, under low operating conditions (such as the engine slowing down), only the auxiliary oil circuit (one way) supplies fuel. As the fuel supply increases, the fuel pressure rises to a certain value. The oil distribution valve (spring valve) inside or outside the nozzle is opened, and the main and auxiliary oil circuits supply oil at the same time.

The dual-channel is an improved version of the single-channel pressure spray pump head. Its outstanding advantage is that the oil volume adjustment range is large, and it can ensure that under low working conditions (low oil supply), the oil pressure can still be maintained due to the small diameter of the auxiliary oil channel nozzle. Higher, can obtain better atomization quality (especially for nozzles with two-way, double-chamber and double-nozzle, and for double-way single-door nozzles, it can be reliably obtained by increasing the swirl velocity), which can meet the requirements of different working conditions of aviation gas turbines at high and low altitudes Requirements for stable combustion and complete combustion. Therefore, dual nozzles are widely used in aviation gas turbines, and are also widely used in ground gas turbines.

Structural characteristics of single-channel and dual-channel pressure of spray pump head

Single-way pressure spray pump head, simple structure, good atomization quality, widely used in various types of combustion devices, although the range of fuel adjustment ratio is small, it has been widely used in aircraft afterburners. Now it is used in the main combustion chamber It is still used as a starting nozzle and a working nozzle, and the combined atomizing device of a high-performance aviation gas turbine is used as a core nozzle. In addition, in non-combustion equipment, such as spray drying equipment, the pressure atomization method also uses a single-channel pressure spray pump head. Burners (or burners) on industrial furnaces and boilers also use it.

There are many structural forms of the dual-way pressure spray pump head. Here we introduce the spray pump head with three structures: the dual-way single-chamber single-jet nozzle, the dual-way double-chamber single-jet nozzle, and the dual-way double-chamber double-jet nozzle.

In order to accurately design and calculate the single-channel pressure spray pump head and the double-channel spray pump head, the current design method is based on the maximum flow principle method and the momentum equation method. In addition, we have introduced or improved many design methods on this basis.