A method and system for numerically calculating the maximum efficiency of a counterattack runner

Abstract

The invention discloses a method and a system for numerically calculating the maximum efficiency of a counterattack runner. The method comprises the following steps: data input; Coordinate transformation; Construction of the formation line of the cross-section through water; Axial velocity calculation; Calculation of axial streamline; S1, S2 stream surface construction; Spatial relative streamlineconstruction and segmentation; Calculation of space relative flow angle; Calculation of Axial Plane Velocity of Points on Spatial Relative Streamline; Calculation of blade extrusion coefficient 1 / k;Euler energy numerical solution; Maximum efficiency numerical solution; CFD numerical simulation results validation; Judgment accuracy; The calculation results being input into Excel form for displayand storage and Ending the calculation. The system is used for realizing corresponding functions. The numerical calculation method and the corresponding system improve the simplification and rapidityof the calculation process. With the idea of modular design, each sub-module can run independently and be closely related to each other, and the calculation process is clear. is the method and systemare suitable for impeller rotating machinery working in incompressible fluid, and has a wide range of applications, involving in many industrial fields.

Description

technical field [0001] The invention relates to the field of numerical calculation of working characteristics of counterattack rotating machinery, in particular to a fast calculation method for the highest efficiency and optimum hydraulic characteristics of counterattack runners. Background technique [0002] In order to fully ensure the efficiency and safety of hydropower generation, it is necessary to have high requirements on the working performance of the runner, the core component of energy conversion. The maximum output and highest efficiency of the runner under the optimal working condition are important indicators reflecting the performance of the runner. . 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 investment and long time con...

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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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