Numerical calculation method and system for global characteristics of counterattack runner based on virtual thickness

Abstract

The invention discloses a numerical calculation method and system for global characteristics of counter-attack runners based on virtual thickness. The steps include: data input; coordinate transformation; construction of the cross-section forming line; axial-surface velocity calculation; axial-surface streamline calculation; S1 and S2 flow surface construction; spatial relative streamline construction and division; Calculation of axial surface velocity at each point on the streamline; Trial calculation of thickening coefficient; Calculation of virtual thickness blade displacement coefficient; Numerical solution of Euler energy; Numerical solution of efficiency; Verification of CFD numerical simulation results; Judgment accuracy; Interpolation of thickening coefficient; Input to Excel table for display and storage; calculation complete. The system is used to realize corresponding functions. The numerical calculation method and the corresponding system improve the simplification and efficiency of the calculation process; adopt the modular design idea, each sub-module can operate independently and be closely connected with each other, and the calculation process is clear; it is suitable for working in non-compressed fluids The counterattack impeller rotating machinery has a wide range of application objects and involves many industries.

Description

technical field [0001] The invention relates to the field of numerical calculation of working characteristics of counterattack rotating machinery, in particular to a rapid prediction method for efficiency and hydraulic characteristics of counterattack runners under global working conditions. Background technique [0002] Due to its stable output power and rapid adjustment response, hydropower has become an indispensable energy structure for power grids to ensure high-quality electric energy. Therefore, in order to efficiently exert its regulation performance, hydropower requires its core component of energy conversion—the runner to work at a deviation from the optimum. working conditions. In my country, the experimental research on the performance of the runner started in the 1970s and the numerical simulation research based on finite element software started in the 1990s. After years of development, it has become increasingly mature. Full development leads to high cost inve...

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Problems solved by technology

In my country, the experimental research on the performance of the runner started in the 1970s and the numerical simulation research based on finite element software started in the 1990s. After years of development, it has become increasingly mature. Fully developed, resulting in high cost investment and long time consumption, such as the long period of model testing, high computing performance requirements for numerical simulation, etc., have become cost inputs that cannot be ignored in the initial stage of new hydropower projects

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