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Method for designing single-arc pressure surface blade profile of steam turbine

A design method and single-arc technology, applied in the field of impeller machinery, can solve problems such as increasing blade processing costs, achieve broad market application prospects and competitiveness, excellent blade processing technology and aerodynamic efficiency.

Active Publication Date: 2019-09-17
HANGZHOU STEAM TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the steam turbine blades newly developed by most manufacturers are all discrete points, which need to be processed by multi-axis CNC machining methods, which increases the processing cost of the blades

Method used

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  • Method for designing single-arc pressure surface blade profile of steam turbine
  • Method for designing single-arc pressure surface blade profile of steam turbine
  • Method for designing single-arc pressure surface blade profile of steam turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A steam turbine with a drum stage blade, the specific parameters are: back pressure is 8.7bar, flow rate is 20kg / s, isentropic efficiency is 98%, total inlet pressure is 10bar, and total inlet temperature is 633K.

[0028] like figure 1 As shown, a steam turbine single-arc pressure surface airfoil design method is composed of the following modules: the existing single-arc pressure surface airfoil database, the conventional airfoil geometric characteristic parameter database; the twelve-parameter single-arc Pressure surface airfoil construction module; new single-arc airfoil modeling module; existing airfoil single-arc parameterization module; plane cascade CFD calculation module. The above modules iterate each other until the airfoil performance parameters meet the design requirements. The steps are:

[0029] Step 1: Transmit the blade modeling requirements to the geometric feature parameter database of the existing single-arc pressure surface airfoil and conventional...

Embodiment 2

[0037] Parametric fitting is carried out on the existing airfoil of a certain drum stage of a steam turbine, and the isentropic efficiency of this airfoil is 97.5%.

[0038] A method for designing a single-arc pressure surface airfoil of a steam turbine, the method is composed of the following modules:

[0039] Existing single-arc pressure surface airfoil database, conventional airfoil geometric feature parameter database; 12-parameter single-arc pressure surface airfoil construction module; new single-arc airfoil modeling module; existing airfoil single-arc parameterization Module; plane cascade CFD calculation module. The above modules iterate each other until the airfoil performance parameters meet the design requirements. The steps are:

[0040] Step 1: Transmit the blade modeling requirements to the geometric feature parameter database of the existing single-arc pressure surface airfoil and conventional airfoil, and screen the geometric feature parameter boundaries of t...

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Abstract

The invention discloses a method for designing a single-arc pressure surface blade profile of a steam turbine. The method comprises the following multiple modules of a geometrical characteristic parameter database comprising an existing single-arc pressure surface blade profile and a conventional blade profile; a twelve-parameter single-arc pressure surface blade profile construction module; a brand new single-arc blade profile modeling module; an existing blade profile single-arc parameterization module, and a planar cascade CFD calculation module. The modules are mutually iterated until the blade profile performance parameters meet the design requirements. According to the blade profile designed by the method for designing the single-arc pressure surface blade profile of the steam turbine, the machining cost is only 1 / 4-1 / 3 of that of a conventional discrete point blade profile, and the development speed of the new blade profile is increased by more than 30% compared with that of a traditional method.

Description

technical field [0001] The invention belongs to the field of impeller machinery, and relates to a method for designing a single-arc pressure surface airfoil of a steam turbine. Background technique [0002] Steam turbine is an important equipment for function conversion, and is widely used in various fields such as electric power, petroleum, chemical industry, metallurgy, energy, nuclear power, and ships. Steam turbines are complex in structure and difficult to design and manufacture, and belong to the high-end equipment manufacturing industry. [0003] In order to continuously improve the efficiency of heat-to-power conversion of steam turbines, the optimization and design of the through-flow blade profile has been carried out. The airfoil design methods of various companies have been continuously upgraded, and the efficiency has been gradually improved; with the development of computer technology and computational fluid dynamics, the full three-dimensional flow field opti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 蓝吉兵孔建强隋永枫袁浩丁旭东王佳男庄达明
Owner HANGZHOU STEAM TURBINE
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