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A method for calculating dynamic frequency of self-locking blade of industrial steam turbine

A calculation method and technology for industrial steam turbines, applied in the directions of calculation, computer-aided design, design optimization/simulation, etc., can solve the problems of locking, can not reflect the damping characteristics of contact stiffness, and achieve safe and reliable operation, good economic benefits, and use. handy effect

Active Publication Date: 2019-03-01
HANGZHOU STEAM TURBINE
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Problems solved by technology

For the dynamic frequency calculation method of this kind of blade, the local node coupling method is generally used, and the position and range of the coupling node are determined according to the contact area and contact pressure after the strength calculation. The disadvantage is that some nodes are locked after coupling, so it reflects Regardless of the magnitude of the contact stiffness and the damping characteristics of the relative slip

Method used

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  • A method for calculating dynamic frequency of self-locking blade of industrial steam turbine
  • A method for calculating dynamic frequency of self-locking blade of industrial steam turbine
  • A method for calculating dynamic frequency of self-locking blade of industrial steam turbine

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Embodiment 1

[0019] Such as Figure 1-3 As shown, there is a certain gap between the blade shroud and the boss, and the blade will produce a torsion angle under the action of centrifugal force. , the contact conditions are also different.

[0020] The method for calculating the dynamic frequency of the full-circle self-locking blades of the steam turbine described in this embodiment includes the following steps:

[0021] (1) Calculate the static strength of the blades in contact, and obtain the torsion angle at the top of the blade and the contact pressure between adjacent blade shrouds. The contact pressure is as follows: Figure 5 shown.

[0022] (2) In the area where the contact pressure is greater than 30MPa, that is Figure 5 In the darkest area, the spring unit MATRIX27 is established between the nodes on it, with a total of 48 units, such as Figure 4 shown.

[0023] (3) Let the normal stiffness k of the above spring unit n Same, tangential stiffness k t also the same, let v...

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Abstract

A method for calculating dynamic frequency of self-locking blade of industrial steam turbine is a finite element method, First, the static strength of the blade considering contact is calculated, thetorsion angle of the blade tip and the contact pressure between the adjacent blade shroud are obtained. A spring element (MATRIX 27) is established between nodes in a region where the contact pressureis greater than 30 MPa, in lieu of that contact unit, Let the normal stiffness kn of these elements be the same. The tangential stiffness kt is also the same, and have a certain relationship. The relationship is related to the properties of the material, Resize kt, static strength calculation, Finally, the dynamic frequency of the self-locking blades is calculated according to the obtained valuesof kn and kt. The method has been applied to the dynamic frequency calculation of the last stage blades of an industrial steam turbine used in a large-scale PTA plant. The experimental results show that the dynamic frequency error calculated by this method is less than 4%.

Description

technical field [0001] The invention relates to a finite element calculation method for industrial steam turbine moving blades, in particular to an industrial steam turbine self-locking structure long torsion blade moving method that can be used in the manufacturing fields of large-scale PTA, large-scale ethylene, large-scale air separation and large-scale power station feedwater pumps and other important national high-end equipment manufacturing fields. A new method of frequency calculation. Background technique [0002] A steam turbine is a power device that converts the thermal energy of water vapor into mechanical energy. Industrial steam turbines are driving equipment mainly used to drive feed water pumps, compressors and other industrial fields, and are characterized by complex variable working conditions and large speed ranges. With the development of science and technology, industrial steam turbines are developing in the direction of large capacity and high power, w...

Claims

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Application Information

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IPC IPC(8): G06F17/50G01H17/00
CPCG01H17/00G06F30/17G06F30/23G06F2119/06
Inventor 隋永枫朱子奇孔建强李祎曼余沛坰闫志勇张发生蓝吉兵辛小鹏王宏泽
Owner HANGZHOU STEAM TURBINE
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