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 […]
New material – Maintenance of aero engine high pressure turbine blades
Aero engine is a high-tech product with high comprehensive technical difficulty, only a few countries in the world can independently develop, aero engine is linked to aerodynamic performance, combustion heat transfer, strength vibration, material technology, assembly and maintenance and other advanced technology bridge and link.Under this background, blade repair technology is particularly important. By using advanced superalloy materials such as single crystal nickel-based superalloys and ceramic matrix composites (CMCs), combined with new coating technologies and sophisticated repair processes, we are able to significantly improve the heat and corrosion resistance of high-pressure turbine blades and extend their service life. Turbine blades are important components that convert part of the energy of […]
Research on gas-thermal coupling analysis method of turbine blades based on parametric modeling
The appearance of air-cooled turbine makes the turbine front temperature of aero engine further increase, which promotes the rapid development of high performance aero engine. However, with the application of complex internal shock, enhanced heat transfer by turbulent flow, convection gas film, dense gas film spray and other cooling forms on turbine components, the interaction between cold air and gas becomes more and more complex. In order to quickly and accurately evaluate the coupling effects of flow and heat transfer on complex cooled turbine blades, a parametric modeling method is developed to perform high-fidelity geometric modeling and aerothermal coupling simulation for GE E3 high-pressure turbine first-stage guides. The analysis results […]
The beauty of high temperature blade precision casting mold
In the grand picture of modern industry, gas turbine as the core of efficient energy conversion device, its complex structure not only shows the beauty of engineering technology, but also reflects the spirit of human pursuit of extreme performance. Behind all this, it is inseparable from the support of precision casting technology. Precision casting molds, as a key link in this process, are not only the basis for the manufacture of high-quality gas turbine components, but also the bridge between the design idea and the actual product. Through highly accurate design and manufacturing processes, these molds ensure that each casting can meet extremely strict dimensional tolerances and surface quality requirements, […]
Directional solidification of single crystal blades under industrial conditions using the developed air-cooled casting method (2)
In order to better evaluate the directional solidification process, the dendrite microstructure was described by measuring the primary dendrite spacing (PDAS) in different regions on cross-section 4 and cross-section 9 of some blades [Figure 3(a) and (b)]. To do this, we use the relation PDAS =√(A/N), where A is the region being analyzed and N is the number of dendrite nuclei on a given region. The results show that the values of PDSA in castings are different under different measuring positions and directional solidification methods. FIG. 2 Sample dendrite microstructure of the outer, middle and inner regions of the platform and airfoil produced by the Bridgeman method (b) to (g) […]
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