Hydraulic mechanical property analysis method based on numerical calculation

A technology of hydraulic machinery and analysis methods, applied in computer-aided design, calculation, CAD numerical modeling and other directions, can solve the problems of large workload, long cycle, expensive experiment cost, etc., to reduce cavitation, improve stability, improve The effect of efficiency

Pending Publication Date: 2022-07-29
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

Theoretical solution method can have a deeper understanding of the essential law of the phenomenon, but the research on the flow mechanism is not enough, it is difficult to consider the influence of all relevant factors in engineering applications on the flow and the interaction between various factors, so in engineering There are certain restrictions in the application
Due to the complexity of the structure of the hydraulic machinery itself, the cost of the experiment is expensive, the cycle is long, and the workload is heavy. At the same time, it is also limited by external factors such as measurement methods and measuring instruments, so the experiment cannot reach a completely accurate level.

Method used

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  • Hydraulic mechanical property analysis method based on numerical calculation
  • Hydraulic mechanical property analysis method based on numerical calculation
  • Hydraulic mechanical property analysis method based on numerical calculation

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Embodiment 1

[0020] The numerical calculation-based hydraulic mechanical performance analysis method includes the following steps:

[0021] Step 1. Build a model according to the actual hydraulic machinery photos, divide the grid, determine the boundary conditions, and carry out numerical simulation to obtain the simulation results; the details are:

[0022] According to the photos of the HLA551-LJ-43 Francis turbine, the design flow rate is 0.7m / s, and the design speed is 600r / min;

[0023] The established model is meshed, and ICEM is used to divide the mesh. The specific operations are as follows: first divide the imported model into a watershed, set the size of each watershed to divide the mesh, then associate and combine to obtain a complete full flow channel structure grid;

[0024] The determined boundary conditions are: the velocity inlet boundary condition at the volute inlet and the free outflow boundary condition at the draft tube;

[0025] According to the boundary conditions,...

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PUM

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Abstract

The invention relates to a hydraulic mechanical property analysis method based on numerical calculation, and belongs to the technical field of hydraulic machinery. Establishing a model according to the actual hydraulic machinery picture, dividing grids, determining boundary conditions, and performing numerical simulation to obtain a simulation result; adopting Tecplot software to obtain a speed cloud picture and a pressure cloud picture of the most basic physical quantity related to the speed and the pressure according to the obtained simulation result; obtaining a cavitation volume fraction contour cloud picture, and predicting and analyzing the cause of the cavitation part; obtaining an isoline cloud picture of the vortex structure, and predicting and analyzing reasons of the vortex generation region; and obtaining an entropy production cloud picture, and predicting and analyzing reasons of an area with relatively large hydraulic loss. The method has great significance in improving the efficiency of hydraulic machinery, reducing cavitation and improving the stability of a unit in actual engineering.

Description

technical field [0001] The invention relates to a method for analyzing the performance of hydraulic machinery based on numerical calculation, and belongs to the technical field of hydraulic machinery. Background technique [0002] For hydraulic machinery, the internal flow characteristics of hydraulic machinery can be obtained through theoretical solution, experimental research, and CFD numerical simulation. The theoretical solution method can deeply understand the essential laws of the phenomenon, but the research on the mechanism of the flow is not enough, and it is difficult to take into account the influence of all relevant factors in engineering applications on the flow and the interaction between the factors. There are certain restrictions in the application. Due to the complexity of the hydraulic machinery itself, the experiment cost is expensive, the cycle is long, and the workload is large. At the same time, it is also limited by external factors such as measuring ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F111/10G06F113/08G06F119/14
CPCG06F30/20G06F2119/14G06F2111/10G06F2113/08
Inventor 郭涛徐李辉张晋铭罗竹梅
Owner KUNMING UNIV OF SCI & TECH
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