Virtual thickness-based counterattack runner global characteristic numerical calculation method and system

Abstract

The invention discloses a virtual thickness-based counterattack runner global characteristic numerical calculation method and system. The method comprises the following steps of inputting the data; carrying out coordinate transformation; constructing a water passing section forming line; calculating the axial surface speed; calculating an axial surface streamline; constructing the flow surfaces S1and S2; constructing and segmenting a spatial relative streamline; calculating a spatial relative water flow angle; calculating the axial surface speed of each point on the spatial relative streamline; trial-calculating a thickening coefficient; calculating a virtual thickness blade displacement coefficient; carrying out euler energy numerical solution; carrying out efficiency numerical solution;verifying a CFD numerical simulation result; judging the precision; performing thickening coefficient interpolation; inputting the calculation result into an Excel table to be displayed and stored; and ending the calculation. The system is used for realizing the corresponding functions. According to the numerical calculation method and the corresponding system, the simplification and the high efficiency of the calculation process are improved, by adopting a modular design thought, all the sub-modules can operate independently and are closely connected with one another, and the calculation process is clear. The method and the system are suitable for the impact type impeller rotating machine working in the uncompressed fluid, have the wide application objects and relate to the field of numerous 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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