Finite element analysis method for T-shaped blade root pre-twisted blade of steam turbine
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An analysis method and steam turbine technology, applied in computer-aided design, special data processing applications, instruments, etc., can solve problems such as differences in blade analysis results, and achieve the effect of improving work efficiency
Inactive Publication Date: 2019-07-19
HARBIN TURBINE
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[0005] The purpose of the present invention is: in the prior art, there is only an analysis method for the strength of the pre-twisted blade, and there is no analysis method for the vibration frequency and pre-twisted characteristics of th...
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specific Embodiment approach 1
[0036] Specific implementation mode one: the following combination figure 1 and figure 2 Describe this embodiment, in this embodiment, a kind of finite element analysis method of T-type blade root pre-twist blade of steam turbine, comprises the following steps:
[0037] Step 1: Geometry Model Processing
[0038] First select the geometric model of single-stage blades, single-stage gap fillers, and rotor components corresponding to single-stage blades, and then use 3D software to make a geometric model in a sector;
[0039] Step 2: CAE model processing
[0040] Firstly cut the geometric model with cyclic symmetry part, then draw the hexahedral mesh model in the mesh division software for the cut model, and finally define the material data of the blade, rotor and gap filler in the CAE calculation software according to the requirements, and define Settings such as contacts, boundaries and loads, followed by job submission and calculations;
[0041] Step 3: CAE post-processin...
Embodiment
[0044] The present invention can be divided into the following three parts: geometric model processing, CAE model processing and CAE post-processing for specific implementation.
[0045] 1. Geometric model processing
[0046] see figure 1 , the geometric model mainly includes the selection of the single-stage blade 1, the single-stage interstitial strip 2, and the selection of the rotor 3 corresponding to the single-stage blade. The present invention uses a cyclic symmetry model to calculate the entire circle of blades, and uses three-dimensional software (NX, etc.) to make a geometric model in a sector according to selection.
[0047] Select the scheme of the rotor part such as figure 2 As shown, if it is to calculate the intermediate level, select the two boundaries of 1-1 and 2-1 in the figure to intercept and create a geometric model. If it is the first and last blades, one of the interception boundaries is boundary 1-1, and the other end interception must choose bound...
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Abstract
The invention discloses a finite element analysis method for a T-shaped blade root pre-twisted blade of a steam turbine, and relates to the technical field of computer-aided engineering. The method solves a problem of requirements on blade strength, vibration frequency and blade pre-twisting characteristics in finite element analysis of T-shaped blade root pre-twisting blades in the prior art. Themethod comprises the following steps: 1, performing geometric model processing, selecting components of blades, gap filling strips and rotors to manufacture a geometric model in a sector; 2, performing CAE model processing, specifically, drawing a hexahedral mesh model after cyclic symmetry part cutting is conducted on the geometric model, defining materials, boundaries, loads and the like of blades, rotors and gap filling strips according to requirements, and submitting and calculating; and 3, performing CAE post-processing, analyzing the static stress of the blade under each working condition, analyzing the blade frequency by using a frequency SAFE graph, and analyzing the contact area and the contact stress of each contact surface. The static strength, the vibration characteristic andthe pre-twisting characteristic of the blade under different operation conditions of the steam turbine can be effectively analyzed, and the working efficiency can be improved by 30%.
Description
technical field [0001] The invention relates to the technical field of computer-aided engineering (CAE), in particular to a finite element analysis method for a T-shaped root pre-twisted blade of a steam turbine. Background technique [0002] The blade is the heart of the steam turbine and is an extremely important part. It directly plays the role of converting the heat energy of steam or gas into mechanical energy. The blade root is the connecting part that fixes the blade on the impeller or drum. The connection under certain conditions is reliable, and at the same time, it strives to be simple to manufacture and easy to assemble. [0003] The T-shaped blade root has the characteristics of simple structure, convenient processing and assembly, etc. With the increasing use of T-shaped blade root pre-twisted blades in steam turbines, the finite element analysis of the blades has proposed many advantages such as high efficiency, economy, accuracy and uniformity. aspect require...
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