A steam turbine, also known as a steam turbine engine, is a rotating steam power device. High temperature and high pressure steam passes through a fixed nozzle to form an accelerated airflow and is sprayed onto the blades, causing the rotor equipped with blade rows to rotate while doing external work. Steam turbines are the main equipment in modern thermal power plants and are also used in metallurgical, chemical, and naval power plants. A steam turbine is an external combustion rotary machinery that can convert steam thermal energy into mechanical work. After the steam from the boiler enters the turbine, it passes through a series of annular nozzles and moving blades to convert the thermal energy of the steam into mechanical energy for the rotation of the turbine rotor. Steam is converted into energy in different ways in a steam turbine, forming a steam turbine with different working principles. There are many types of steam turbines, and there are various classification methods based on their structure, working principle, thermal performance, purpose, and number of cylinders. There are single stage steam turbines and multi-stage steam turbines; Single cylinder steam turbines with each stage installed in one cylinder, and multi cylinder steam turbines with each stage divided into several cylinders; Single shaft steam turbines with each stage installed on one shaft, and dual shaft steam turbines with each stage installed on two parallel shafts