Method for determining shape and size of turbine blade anti-corrosion sheet based on CFD analysis

A technology of steam turbine blades and anti-corrosion sheets, which is applied in the field of steam turbines, can solve the problems of poor anti-corrosion effect and inaccurate determination of shape and size, and achieve the effect of improving anti-corrosion effect, reducing quality accident costs, and accurate shape and size

Inactive Publication Date: 2019-07-16
HARBIN TURBINE
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that the determination of the shape and size of the anti-corrosion sheet of the steam turbine blade mainly depends on experience, and the determination of the shape and size is not accurate enough, resulting in poor anti-corrosion effect, the present invention provides a method for determining the shape and size of the anti-corrosion sheet of the steam turbine blade based on CFD analysis

Method used

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  • Method for determining shape and size of turbine blade anti-corrosion sheet based on CFD analysis
  • Method for determining shape and size of turbine blade anti-corrosion sheet based on CFD analysis
  • Method for determining shape and size of turbine blade anti-corrosion sheet based on CFD analysis

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specific Embodiment approach 1

[0034] Specific implementation mode one: combine figure 1 The present embodiment is described. The method for determining the shape and size of the steam turbine blade erosion protection sheet based on CFD analysis provided in the present embodiment specifically includes the following steps:

[0035] (1) Perform pre-processing including numerical modeling and mesh division:

[0036] Firstly, the final geometric model is established based on the flow diagram of the low-pressure cylinder, and then the established final geometric model is imported into the grid division software to divide the structured grid;

[0037] (2) Use the solver to solve:

[0038] Import the grid file of the blade into ANSYS CFX software for model setting (including energy equation, turbulence model, etc.), parameter setting (including working fluid, boundary conditions, etc.). ANSYS CFX is a CFD software; The solver, after setting the discrete format and convergence factor for the solver, iteratively s...

specific Embodiment approach 2

[0041] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the specific process of establishing the final geometric model described in step (1) is:

[0042] Prepare the blade data based on the flow diagram of the low-pressure cylinder, and use UG to make the required models for the root of the last-stage stationary blade, the root of the moving blade, and the top expansion angle, and complete the establishment of the last-stage geometric model.

[0043] Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0044] Specific embodiment three: the difference between this embodiment and specific embodiment two is that the division process of the structured grid described in step (1) specifically includes:

[0045] Import the established final-level geometric model into the grid division software to divide the structured grid, and encrypt the grid of the blade inlet and outlet arcs. Usually, the grid density is doubled; after division, from the normal The intersection and aspect ratio of grid cells are used to check the quality of the grid.

[0046] Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for determining the shape and size of a turbine blade anti-corrosion sheet based on CFD analysis, and belongs to the technical field of turbines. The method comprises the following steps: firstly, carrying out pre-processing including modeling and mesh division: establishing a final-stage geometric model based on a low-pressure cylinder through-flow graph, and importing the established final-stage geometric model into mesh division software to carry out structured mesh division; then, using a solver to perform solving to obtain a model which converges to be stable; and finally, analyzing a result, namely observing the flowing condition of the last stage blade by applying post-processing POST software, and comprehensively determining the shape and the size ofthe anti-corrosion t sheet to be mounted on the last stage blade by combining the Mach number cloud chart of the surface and the meridian plane of the last stage blade and the humidity distribution of the surface of the last stage movable blade. The method solves the problem that the shape and the size of the existing turbine blade anti-corrosion sheet mainly depend on experience, the shape and the size are not accurately determined, and the anti-corrosion effect is poor. The method can be used for designing the anti-corrosion sheet of the last-stage moving blade of the steam turbine.

Description

technical field [0001] The invention relates to a method for determining the shape and size of an anti-corrosion sheet of a steam turbine blade, and belongs to the technical field of steam turbines. Background technique [0002] With the continuous enhancement of the flexibility of thermal power units, operation schemes such as multi-working conditions, heat recovery, and heat supply will become the trend of steam turbine power generation in power plants, and the water erosion of the final stage blades will also tend to be serious. Blades, the main protective measure is to inlay Stellite alloy corrosion protection sheets on the moving blades. However, the determination of the shape and size of the anti-erosion sheet and the inlay position of the last-stage moving blade mainly depends on the engineer's experience. The operating conditions of some steam turbines are very different from those in the past, which makes the experience of engineers invalid, causing the blades to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15
Inventor 赵洪羽王健马义良马天吟梁天赋李央刘瑶马小乐张迪高铁印
Owner HARBIN TURBINE
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