What is the difference between a steam turbine, a gas turbine, and an internal combustion engine?
Steam turbines, gas turbines, and internal combustion engines are all types of engines (mechanical devices that generate power). Their ultimate goal is to generate power (for different needs). Their differences mainly lie in their operating principles, sizes, and application scenarios. There is no saying that one is better or worse. Different operating principles The most basic operating principle of an engine is to convert chemical energy (coal, oil, gas, etc.) into mechanical power to drive the load through combustion and other methods. Therefore, the engine can be roughly divided into two parts according to the working process: the combustion system and the power system. If the combustion system and the […]
Welding repair and remanufacturing technology for aircraft engine turbine blades and fan/compressor blades
Aircraft engine blades are in a complex and harsh working environment for a long time, and are prone to various types of damage defects. It is expensive to replace blades, and research on blade repair and remanufacturing technology has huge economic benefits. Aircraft engine blades are mainly divided into two categories: turbine blades and fan/compressor blades. Turbine blades usually use nickel-based high-temperature alloys, while fan/compressor blades mainly use titanium alloys, and some use nickel-based high-temperature alloys. The differences in materials and working environments of turbine blades and fan/compressor blades result in different common types of damage, resulting in different repair methods and performance indicators that need to be achieved after […]
Failure detection and repair technology of aircraft engine blades
Turbine blades are an important part of aircraft engines, with high temperature, heavy load, and complex structure. The quality of inspection and maintenance is closely related to the durability and service life of the work. This paper studies the inspection and maintenance of aircraft engine blades, analyzes the failure mode of aircraft engine blades, and summarizes the failure detection technology and maintenance technology of aircraft engine blades. In the design of turbine blades, new materials with higher quality are often used, and the working margin is reduced by improving the structure and processing technology, so as to improve the engine thrust-to-weight ratio. The turbine blade is an aerodynamic airfoil that […]
Thermal Corrosion Fatigue Performance and Life Prediction Method for Hot End Components of Carrier based Aircraft Engines
The operating environment for hot-section components of shipboard aircraft engines and gas turbines is extremely harsh. In addition to enduring high temperatures, pressures, and rotational speeds, these components are also subject to the corrosive influences of a maritime environment characterized by high salinity and humidity. Turbine rotor components represent the most critically stressed elements within these engines and turbines. These parts must bear significant alternating loads at temperatures ranging from 600 to 1300°C while also being subjected to thermal corrosion from hot exhaust gases and the marine atmosphere, which significantly increases their damage rate. As a result, turbine rotor components are among the highest failure-rate operational parts. As shown in […]
F-class, H-class, J-class, understanding of gas turbine classification
Basic knowledge of gas turbines Gas turbines are mainly composed of three major components: the compressor, the combustion chamber, and the turbine. The gas turbine cycle is generally called a simple cycle. Most gas turbines use a simple cycle scheme, and only heavy-duty gas turbines use a combined cycle scheme. Due to different historical backgrounds, gas turbines have developed along different technical paths. Industrial and marine aero-derivative light gas turbines (commonly known as “aero-derivative machines”) are formed by modifying aircraft engines; industrial heavy-duty gas turbines (widely known as “industrial machines”) are developed following the traditional steam turbine concept, which is mainly used for mechanical drives and large power stations. A […]
There is a universe hidden in every turbine blade
The beauty of the universe lies in its mystery and depth. The Milky Way alone contains countless galaxies, stars and dust, far beyond the range of human observation. Did you know that the turbine blades of aircraft engines also contain a “universe” of materials. In this “universe”, atoms and molecules are cleverly combined to help the engine meet various performance requirements. Turbine blades Material research and development Blade material development process In the 1930s, researchers developed high-temperature alloys with excellent high-temperature performance to replace stainless steel, allowing the blade to be used at temperatures up to 800°C. Soon after, the emergence of vacuum smelting technology promoted the development of cast […]
Basic knowledge of aircraft engine blades (1)
Introduction to turbine blades The component with the worst working conditions in the turbine engine is also the most important rotating component. In the hot end components of aircraft engines, the turbine blades are subjected to high-temperature gas erosion and temperature changes during the engine start-up and shutdown cycles, and the rotor blades are subjected to centrifugal force at high speeds. The material is required to have sufficient high-temperature tensile strength, endurance strength, creep strength, as well as good fatigue strength, oxidation resistance, gas corrosion resistance and appropriate plasticity. In addition, long-term organizational stability, good impact strength, castability and low density are also required. The gas inlet temperature of advanced […]
Research and application of adaptive machining technology for damage repair of aero-engine turbine blade tips
The repair of damaged turbine blades is of great significance to the maintenance and life extension of aircraft engines. This paper reviews the research progress of the repair technology of a certain nickel-based cast high-temperature alloy turbine working blade, focusing on the repair method of adaptive machining at the blade tip, and deeply expounds the experimental processing process and verification results, and looks forward to the development prospects of turbine blade repair technology. The aircraft engine is the power core of the aircraft. Among the various components of the aircraft engine, the functional mission and working characteristics of the turbine blades determine that it is one of the rotating parts […]
Study on the influence mechanism of thermal barrier coating on the cooling effect of turbine blades of a certain type of gas turbine
In order to obtain the thermal insulation effect and temperature distribution law of thermal barrier coating on turbine blades, a certain type of gas turbine high-pressure turbine moving blade with internal cooling structure was used as the basic model. The cooling effect of high-pressure turbine moving blade with or without thermal barrier coating protection was numerically calculated by gas-heat coupling method, and the influence of thermal barrier coating on blade heat transfer was studied by changing the thickness of thermal barrier coating. The study found that after coating with thermal barrier coating, the temperature of the blade dropped significantly, the closer to the leading edge, the greater the temperature drop, […]
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