Pumps & Water Turbines
Pumps and water turbines operate with liquids. In some applications, the machine must do dual duty: as a pump that delivers water into a reservoir at off-peak times and then as a turbine to extract energy power when demand is high. Both machines must operate at peak efficiency.
The pump may well be the most broadly applied type of rotating machine, used to move a variety of fluids in virtually every industry — including process, energy, transportation, medical, consumer products and others. Pumps are available in a range of styles (axial, mixed flow, radial) and sizes. Because of broad, widespread usage, the devices are believed to consume a significant fraction of the electrical power produced worldwide. Governments around the globe have begun to impose performance standards, which can significantly impact product development processes in this industry.
Engineering simulation tools from ANSYS assist product designers around the world to design and build machines that meet — and exceed — performance benchmarks.
Water turbines are used to generate electric power. The sector has two prongs: improving existing machines (sometimes referred to as rehabilitating) and developing new machines for new applications.
The world’s many old, large hydraulic installations can benefit from more-modern runners, improved distributor components and sculpted draft tubes. Simulation tools from ANSYS have contributed to performance advances by providing key insight into the structural, dynamic and fluid dynamic aspects of these machines. The high-fidelity simulation delivered by ANSYS is critical in these applications, since even small performance improvements can yield large amounts of power — particularly the large Francis-style machines in which runner diameter averages 10 meters.
Courtesy VA TECH HYDRO Ltd.
While water turbine usage is centuries old, novel applications are emerging as the quest for alternate energy sources continues. Unsteady tidal-driven power and run-of-the-river applications can require high performance over a wide operating range, and the off-design conditions present very complex physics. For example, reducing or eliminating the unsteady vortex rope observed in the draft tube at part-load conditions is a challenging task for development engineers. They turn to ANSYS for simulation tools that offer unsurpassed breadth of high-fidelity physics, enabling them to tackle any problem with confidence.
ANSYS BladeModeler provides tools for the detailed geometric specification of hydraulic machinery, axial, mixed-flow 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 and specialized tools from ANSYS enable rapid development of high-quality meshes for bladed components as well as for often-complex stationary components such as inlets, spiral casings, draft tubes and volutes. ANSYS TurboGrid software is the tool of choice for optimal high-quality hexahedral blade row meshes that are scalable, consistent, repeatable and automatically generated.
Rotating machinery-specific pre- and post-processing simplifies the process and reduces overall simulation time. All general and rotating-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 as well as full 3-D element types enables a scalable modeling approach adaptable to any situation, with the ability to incorporate seal and bearing effects.
The ANSYS throughflow solver ANSYS VISTA TF is ideal for rapid and reliable impeller or runner design as well as for single- or multi-stage analysis for multiple blade row applications. A wide selection of models and access to the same post-processing as full ANSYS CFD technology ensures wide applicability and high-productivity usage.