Gas & Steam Turbines
Gas and steam turbines are available in a wide range of sizes. They are commonly used for power generation and a variety of mechanical drive applications. Steam turbines operate in thermal and nuclear power plants; they also are being used more and more with gas turbines in combined-cycle power plants. Gas turbines are often favored for their flexibility and smaller footprint as well as their relative ease at bringing a new plant online or supplementing an existing plant.
A common goal for both machine types is high efficiency, which incorporates lower fuel usage and reduced carbon emissions. Advances in blading design and higher-temperature operation have contributed to improved steam turbine thermal efficiency. In the industrial gas turbine arena, advanced cooling strategies have contributed to increased efficiency, while improvements in combustor technology have yielded reduced pollutant emissions. These machines have much in common with aircraft engine gas turbines, and, indeed, aeroderivative engines are used in some industrial situations, particularly when flexibility and portability are important considerations.
Courtesy MTU Aero Engines Gmbh.
Even with such advanced technology, customers demand even greater performance. Gas and steam machines have a long service life. As customer requirements change, suppliers are asked to upgrade and modify existing machines — a challenging task due to the constraints imposed by the existing machine.
Engineering simulation tools from ANSYS provide high-fidelity advanced physics that turbine designers need, whether the application is new machine design or machine rerating. The suite’s flexibility means the tools can be applied for operation in interactive mode or in batch mode within the design system of the manufacturer or consultant. The technologies are integrated within a common fluid dynamics and electronics software for which ANSYS is well known.
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ANSYS BladeModeler provides tools for the detailed geometric specification of compressor and turbine-bladed components, axial or radial. These tools can be used within the ANSYS Workbench environment or connected into an existing design system, enabling high-productivity design and analysis, including optimization.
General-purpose tools from ANSYS enable rapid development of high-quality meshes for complex stationary and secondary flow path components. ANSYS TurboGrid is the tool of choice for optimal high-quality hexahedral blade row meshes that are scalable, consistent, repeatable and automatically generated.
The ANSYS throughflow solver ANSYS VISTA TF is ideal for rapid and reliable multi-blade row component design and optimization. A wide selection of models and access to the same post-processing as full ANSYS CFD technology ensures wide applicability and high-productivity usage.
Turbomachinery blade row-specific pre- and post-processing simplifies the process and reduces overall simulation time. All general and turbomachinery-specific functions are available in a modern graphical user interface or via command, ideal for repeatable, automated operation.
The rotordynamics capability is a central element in the ANSYS structural solver. Availability of axisymmetric and 3-D element types enables a scalable modeling approach adaptable to any situation, able to include not only seal and bearing effects but casing influence as well.
ANSYS CFD technology provides the ideal platform for comprehensive gas turbine analysis. The most advanced physical, turbulence, combustion and emission models delivered in a scalable environment enable complete combustor simulation.