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Design method of twisted swept structure stator blade for steam turbine

A design method and technology of static vanes, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of flow loss in the last few stages of low pressure and long vanes, and achieve enhanced dynamic and static flow matching, reduce aerodynamic losses, improve Intake flow field effect

Pending Publication Date: 2022-03-29
HARBIN TURBINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of flow loss of long blades in the last few stages of low pressure of existing steam turbines, the present invention further proposes a design method for stator blades of twisted and swept structure used in steam turbines

Method used

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  • Design method of twisted swept structure stator blade for steam turbine

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specific Embodiment approach 1

[0026] Specific implementation mode one: combine figure 1 To illustrate this embodiment, a method for designing a stator blade with a twisted and swept structure for a steam turbine described in this embodiment includes the following steps:

[0027] Step 1: Determine the blade design basis and stacking law: the blade design basis is straight blades, without bending and torsion-sweeping structure, and the stacking law is stacking along the center of the steam outlet circle. The structural parameters of the basic straight blades include the total blade height L, The top axial width of the working part of the blade is V, and the diameter of the blade root is The exhaust area of ​​the working part of the blade is A;

[0028] Step 2: Based on the basic straight blades and stacking rules, add bending, sweeping, and twisting to the blades to obtain stationary blades with curved, twisted, and swept structures;

[0029] Step 3: Determine the initial stacking line, and obtain the geo...

specific Embodiment approach 2

[0038] Specific implementation mode two: combination figure 1 Describe this embodiment. In the second step of this embodiment, the blade bending includes parameter determination of the bending direction, bending height and bending angle, wherein the bending direction adopts positive bending, and the bending area is located at the root of the blade. The height is 10% to 15% of the total height L of the blade, and the bending angle is an included angle with the vertical direction, which is controlled between 10° and 45°. The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0039] The bending direction is divided into positive bending and reverse bending. The positive bending means that the pressure surface bends to the suction surface, and the reverse bending means that the suction surface bends to the pressure surface. In this embodiment, positive bending is selected.

specific Embodiment approach 3

[0040] Specific implementation mode three: combination figure 1To illustrate this embodiment, in the second step of this embodiment, blade sweeping includes parameter determination of sweeping direction, sweeping height and sweeping angle. , the sweeping area is on the top of the blade, the shapes of two adjacent sections during the sweeping process are exactly the same, only the axial position changes, the sweeping height is less than or equal to 10% of the height of the working part of the blade, and the sweeping angle is the distance between the vertical direction The angle is controlled between 20° and 40°. The undisclosed technical features in this embodiment are the same as those in the second embodiment.

[0041] The direction of adding and sweeping is the axial direction, which can be divided into two types: steam inlet sweeping toward outlet and steam outlet sweeping toward inlet. This embodiment adopts steam inlet toward outlet, which can control the aerodynamic los...

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Abstract

The invention discloses a design method of a twisted swept structure stator blade for a steam turbine, and relates to the technical field of steam turbine blades. The invention aims to solve the problem of flow loss of low-pressure last-stage long blades of an existing steam turbine. The method comprises the steps that a blade design foundation and a stacking rule are determined, wherein the blade design foundation is a straight blade without a bending and twisting structure, and the stacking rule is stacking along the circle center of a steam outlet circle; based on the basic straight blade and the stacking rule, bending, sweeping and twisting are conducted on the blade, and the static blade of the bending, twisting and sweeping structure is obtained; an initial stacking line is determined, and a stator blade geometric entity is obtained in combination with the typical section blade profile; importing the obtained geometric entity into a blade three-dimensional simulation calculation and optimization platform, and further performing blade pneumatic calculation and blade strength calculation; and obtaining an optimal stacking line according to a calculation result, and finally stacking each typical section along the optimal stacking line to obtain the bending-twisting-sweeping blade. The method is used for designing the steam turbine stator blade.

Description

technical field [0001] The invention relates to the technical field of steam turbine blades, in particular to a design method for a steam turbine with a twisted and swept structure stator blade. Background technique [0002] As one of the three main equipments in thermal power plants, the steam turbine's aerodynamic performance is directly related to the cost and efficiency of power generation, and has a great impact on the national economy. However, in the design process of the low-pressure long blades of the steam turbine, due to the long radial length of the blades, the large expansion angle, and the high humidity of the steam, the working medium of the blades has supersonic speed, the secondary flow loss at the end is large, and the flow radial Problems such as drastic changes and poor flow matching between moving and stationary blades seriously affect the aerodynamic efficiency of the low-pressure last-stage blades. Considering safety issues such as the strength and vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F119/14
CPCG06F30/17G06F2119/14
Inventor 关淳翁振宇李宇峰王健赵洪羽马义良尉坤郭魁俊梁天赋徐林峰潘劭平翟彦恺郭庆丰魏军
Owner HARBIN TURBINE
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