Turbine blades are metal plates that convert the power of the expanded gas into mechanical work to produce electricity. They operate at high temperatures and loads, so they require solutions to improve reliability and service life.

Design and function of a gas turbine blade

A turbine blade is a metal plate designed to work with expanded gas flows in a turbine plant.

Blade types:

Blades are mounted on a shaft and are used to give rotation to the generator

The guide vanes are an integral part of the stator (stationary casing of the turbine). They serve to direct the gas flow at the required angle, which increases the efficiency of the installation.

The incoming air enters the compressor, is compressed and fed into the combustion chamber, where it mixes with natural gas and expands.

The combustion products are sent to the stator blades, which partially convert the flow energy and direct it to the working plates.

Under the pressure of the expanded hot gas, the blades rotate the shaft connected to the power generator, and the process of generating electricity begins.

The working blades are attached to the rotor with discs. One disk with plates makes up the turbine stage.

The installation can have a very different number of steps, it depends on the operating conditions and the required power. They are provided with plates of different lengths to increase the efficiency of the unit.

Components of a gas turbine blade:

The feather is a curved plate in direct contact with the hot gas. As a rule, its length is 4 times its width.

Shelf – the end section of the pen, located perpendicular to it. It is an optional part, but it is often used to protect the shank and disc from hot gas, and allows to reduce the thickness of the disc rim.

Shank – a locking fragment with which the blade is inserted into the groove of the disc

The distance between the two blades is called the channel. Gas passes through it. The shelves are in contact with each other or are installed at a distance of up to 0.2 mm and form the channel body. Together they create a closed ring around the disc.

Turbine blade root

The shank of the turbine blade is its most loaded element. To protect against fretting corrosion and damage due to high loads, a special anti-friction solid lubricant coating MODENGY 1001 is used, which further facilitates the installation and dismantling of the connection. The material works at temperatures up to +440 °C.