Anti-CMAS Corrosion of Thermal Barrier Coatings for Gas Turbines (1)
Affected by the external environment, some environmental deposits are often produced on the surface of the hot end components of heavy-duty gas turbines (such as turbine blades), mainly from molten salts in the marine environment, vanadates and sulfates, the combustion products of low-grade fuels, and sand, fly ash, runway debris in the air, etc. These deposits have a great impact on the life of the coating and will penetrate into the coating at high temperatures, thereby causing molten salt corrosion. Therefore, molten salt corrosion is difficult to avoid in the actual application of thermal barrier coatings for heavy-duty gas turbines. In gas turbines, thermal corrosion is an important failure mode. […]
Thermal Corrosion Fatigue Performance and Life Prediction Method for Hot End Components of Carrier based Aircraft Engines (1)
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 […]
Research progress and development trend of heavy-duty gas turbines and their thermal barrier coatings (5)
Anti-CMAS Corrosion of Thermal Barrier Coatings for Gas Turbines Affected by the external environment, some environmental deposits are often produced on the surface of the hot end components of heavy-duty gas turbines (such as turbine blades), mainly from molten salts in the marine environment, vanadates and sulfates, the combustion products of low-grade fuels, and sand, fly ash, runway debris in the air, etc. These deposits have a great impact on the life of the coating. They will penetrate into the coating at high temperatures, causing molten salt corrosion. Therefore, molten salt corrosion is difficult to avoid in the practical application of thermal barrier coatings for heavy-duty gas turbines. In gas […]
Research progress and development trend of heavy-duty gas turbines and their thermal barrier coatings (4)
Key properties of gas turbine thermal barrier coating Because the work of ground heavy gas turbines is generally in a complex environment, and the maintenance cycle is long, it can be as high as 50,000 hours. Therefore, in order to improve gas turbine thermal barrier coating technology and extend the service life of thermal barrier coating, in recent years, researchers have conducted a lot of research on the key properties of thermal barrier coating, such as heat insulation, oxidation resistance, thermal shock resistance and CMAS corrosion resistance. Among them, the research and progress of thermal barrier coatings on heat insulation, oxidation resistance and thermal shock resistance are relatively sufficient, but […]
Full 3D numerical simulation technology accelerates aircraft engine development (2)
High-precision aerodynamic and combustion coupled simulation Due to the multiphase flow characteristics of fuel atomization, evaporation, mixing, and rapid chemical reactions inside the combustion chamber or afterburner, and the high-speed flow inside the compressor and turbine has high flow curvature, shock wave wake boundary layer interaction, and mixing of the sealing flow and the mainstream. Therefore, there are very obvious differences between the combustion chamber flow simulation and the internal flow of the impeller components, and it is necessary to conduct targeted research on the aerodynamic and combustion coupling simulation model to ensure high simulation accuracy. The focus needs to break through the high-precision simulation technology of complex reaction flows […]
Full 3D numerical simulation technology accelerates aircraft engine development (1)
As a digital engine to accelerate the development of aircraft engines, the full three-dimensional simulation technology of the whole engine can realize high-precision and rapid prediction of the full three-dimensional performance of the whole engine in the virtual digital space, solve the problem of engine matching, shorten the R&D cycle, reduce development risks and costs, realize the paradigm shift from traditional design to predictive design, and accelerate the development process of aircraft engines. The development of traditional aircraft engines adopts a serial development model of “design, test verification, design modification, and re-testing” that is repeated and iterated. In particular, the performance of the whole engine needs to be verified through […]
Research progress and development trend of heavy-duty gas turbines and their thermal barrier coatings (3)
In the field of heavy industry, the more common heat-power conversion type power generation equipment – heavy gas turbine, due to the small footprint, short cycle, high efficiency, less pollution and other characteristics are widely used in power grid peak load, energy mining and transmission, ocean power generation, advanced ship power, aerospace and other fields, called “industrial pearl”. In a certain sense, the overall development level of the national manufacturing industry is closely related to the research and development level of heavy gas turbines. Preparation of thermal barrier coating To a certain extent, the microstructure of the thermal barrier coating not only affects the thermal insulation, oxidation resistance and other […]
Research progress and development trend of heavy-duty gas turbines and their thermal barrier coatings (2)
Thermal barrier coating Research background of thermal barrier coatings System structure of thermal barrier coating With the progress and development of science and technology, the inlet temperature of gas turbines is getting higher and higher. In order to achieve better thermal insulation effect of thermal barrier coating, most studies around the world focus on designing the structure of thermal barrier coating, which is sufficient to show the importance of the structure of thermal barrier coating [14]. According to the different structure of coating, it can be divided into double layer, multi-layer and gradient structure [15]. Among them, the double-layer thermal barrier coating composed of ceramic layer and bond layer, as […]
Research progress and development trend of heavy-duty gas turbines and their thermal barrier coatings (1)
In the field of heavy industry, the more common heat-power conversion type power generation equipment – heavy gas turbine, due to the small footprint, short cycle, high efficiency, less pollution and other characteristics are widely used in power grid peak load, energy mining and transmission, ocean power generation, advanced ship power, aerospace and other fields, called “industrial pearl”. In a certain sense, the overall development level of the national manufacturing industry is closely related to the research and development level of heavy gas turbines. In 1939, the Swiss BBC company produced the world’s first heavy-duty gas turbine for power generation, which began the rapid development of heavy-duty gas turbines around […]
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