Superalloy turbine accessories are mainly used in aerospace, energy and power fields such as gas turbines and aircraft engines and other equipment.
First, the aerospace field
Aircraft engines:
Superalloy turbine blade is one of the key components of aircraft engine. When the engine is working, the turbine blades need to withstand a complex and harsh working environment such as extremely high temperature (usually up to 1000 ° C or more) and strong centrifugal force. For example, the turbine front temperature of the advanced fighter engine has exceeded 1700 ° C. With their excellent high temperature strength, oxidation resistance and thermal corrosion resistance, superalloys are able to ensure stable operation of turbine blades in such extreme conditions, providing powerful power for aircraft.
The turbine disc is also an important turbine accessory, which connects the blades and transmits the power of the engine. Superalloy turbine disks need to have high yield strength and fatigue strength to withstand the huge stress generated by high-speed rotation. Some high-performance aeroengine turbine disks are made of powder metallurgy superalloys, which are about 30% stronger than ordinary cast superalloys.
Rocket engine:
In rocket engines, superalloy turbopump fittings play a key role. The turbine pump needs to pump a large amount of fuel and oxidizer to the combustion chamber at high speed in a very short time, and its working speed is very high (usually up to tens of thousands of revolutions per minute), and to withstand high temperature and high pressure working environment. Parts such as turbopump impellers and housings made of superalloy can meet these demanding requirements and ensure the reliable operation of rocket engines. For example, in the engines of some large launch vehicles, the outlet pressure of the turbopump can reach hundreds of atmospheres.
2. Energy and power
Gas turbine:
In gas turbines used for power generation, superalloy turbine blades and turbine discs are the core components. The gas turbine needs to run continuously for a long time during the power generation process, and its operating temperature is also quite high (generally above 1000 ° C). Superalloy turbine accessories ensure high efficiency and high reliability of gas turbine operation in high temperature environment. For example, the power generation efficiency of large combined cycle gas turbines can exceed 60%, where the performance of superalloy turbine fittings plays a crucial role.
