Single pressure spray pump head and double spray pump head
1.The working principle of single and double pressure of spray pump head
Single-way pressure spray pump head is also known as a simple centrifugal nozzle. As the name suggests, it uses the swirling parts of the nozzle to produce liquid rotation, and accelerates the spray of FFJ pawn diffusion cone oil film in the convergence channel, and makes use of the high speed difference between the liquid and the outside air to break and atomize.The centrifugal force of swirl is used, so the cyclone is the key part.The cyclone chamber and nozzle connected to the cyclone (plate) are equally important.They can be integrated (collectively referred to as atomizers), or they can be separated into individual units.
There are two oil channels (main and secondary oil channels, or primary and secondary oil channels) in the dual oil pressure spray pump head.When the combustion chamber oil supply is less, that is, under low working conditions (such as the engine slow cow state), only the auxiliary oil (one) oil supply, with the increase of oil supply, fuel pressure rises to a certain value, in the nozzle or outside the oil valve (spring valve) open, the main and auxiliary oil supply at the same time.Dual single pressure spray pump head is modified, it is the prominent advantages of large range of fuel control, and can ensure low condition (low oil), due to the deputy oil nozzle diameter is small, high oil pressure can still be, can obtain the good atomization quality (for two-way double room double jet nozzle are most important, for reliable two-way single spray nozzle door improve the swirl speed),It can meet the requirements of stable combustion and complete combustion of aviation gas turbine under different working conditions of high and low altitude.Therefore, double-path nozzles are widely used in aviation gas turbine and ground gas turbine.
2.The structure characteristics of single and double 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 oil volume regulation ratio range is small, has been widely used in aircraft afterburner.At present, it is still used as starting nozzle and working nozzle in the main combustion chamber, and as core nozzle in the combined atomizing device of high performance aviation gas turbine.In addition, in non-combustion equipment, such as spray drying equipment, the pressure atomization method is also the use of single-channel pressure spray pump head.It is also used for burners (or burners) on industrial furnaces and boilers.
There are many kinds of structure forms of dual-way pressure spray pump head. We introduce three kinds of spray pump heads with double-way single-chamber single nozzle, double-way double-chamber single nozzle and double-way double-chamber double nozzle.
In order to design and calculate the single-way pressure spray pump head and the double-way pressure spray pump head accurately, the current design methods are based on the maximum flow principle method and momentum equation method.In addition we in this basis and the title of the birth or improve a lot of juice design methods.