CN106777671B - Low-rotational-inertia turbine design method - Google Patents
Low-rotational-inertia turbine design method Download PDFInfo
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Abstract
The invention discloses a design method of a low-rotational-inertia turbine, which comprises the following steps: setting a preliminary scheme of a low-rotational-inertia turbine, and establishing a digital model of an existing turbine and the preliminary scheme of the low-rotational-inertia turbine; performing stress analysis on the preliminary solution of the existing turbine and the low-moment-of-inertia turbine; and processing the stress analysis result. The low-rotational-inertia turbine obtained by the design method of the low-rotational-inertia turbine has good mechanical strength and service life, reduces the mass and the rotational inertia of the turbine, and can effectively improve the low-speed responsiveness of a supercharging system and the mechanical efficiency and the reliability of a bearing system, thereby improving the efficiency of a supercharger; meanwhile, compared with the existing turbine, the low-rotational-inertia turbine removes partial materials on the back of the turbine, so that the overall uniformity of the turbine is improved.
Description
Technical Field
The invention relates to the field of turbochargers, in particular to a design method of a low-rotational-inertia turbine.
Background
Governments at home and abroad have been increasing the fuel consumption and exhaust emission standards of road vehicles and non-road vehicles in succession since the century so as to cope with global warming and oil crisis. The gradual depletion of petroleum resources and the gradual improvement of emission standards lead a plurality of countries to start to guide the development of engines towards the direction of small displacement and high power in policy, the requirement of small displacement and high power of the engines promotes the development of light weight, high efficiency and low fuel consumption rate of the engines, the turbocharging technology can improve the power of automobile engines, reduce energy consumption and reduce emission, and the technology is one of the most effective means for realizing the aim of energy conservation and emission reduction of the automobile industry and improving the efficiency of the engines at present.
The turbine is one of the core parts of the supercharger, and the structural design, structural strength and endurance reliability requirements of the turbine directly determine the performance, service life and emission effect of the supercharger, so that the turbine is particularly important for structural optimization of the turbine. The main performance indexes of the supercharger are power performance (high efficiency, low fuel consumption rate and the like), low-speed responsiveness (the acceleration time required by the engine from an idle working condition to a maximum torque working condition) and NVH (Noise and Vibration), wherein the low-speed responsiveness of the supercharger is directly influenced by the turbine, and the reduction of the rotational inertia of the turbine is one of effective means for improving the low-speed responsiveness of the turbine. In the prior art, turbine blades are mainly optimized, a heavy turbine wheel back is not optimized, and the turbine wheel back occupies a large part of the self weight of a turbine, so that the prior art cannot effectively reduce the rotational inertia of the turbine, and cannot effectively improve the low-speed response of a supercharger.
Disclosure of Invention
In view of the above, the present invention is directed to a method for designing a low-inertia turbine, in which the turbine manufactured by the method has lower mass and inertia than the existing turbine, and the low-speed response of the supercharger is effectively improved.
Based on the above purpose, the invention provides a design method of a low-rotational-inertia turbine, which comprises the following steps: setting a preliminary scheme of a low-rotational-inertia turbine, and establishing a digital model of an existing turbine and the preliminary scheme of the low-rotational-inertia turbine; performing thermo-mechanical stress and modal stress analysis on the preliminary solution for the existing turbine and the low moment of inertia turbine; processing the thermal-mechanical stress analysis result and the modal stress analysis result to obtain a difference value of the strength of the low-rotational-inertia turbine and the strength of the existing turbine, adjusting the preliminary scheme of the low-rotational-inertia turbine, and performing the thermal-mechanical stress analysis and the modal analysis again until the difference value between the adjusted preliminary scheme strength of the low-rotational-inertia turbine and the strength of the existing turbine is lower than a preset limit value; and adopting the adjusted preliminary scheme of the low-rotational-inertia turbine to produce and manufacture the low-rotational-inertia turbine.
Optionally, the preliminary solution of the low inertia turbine is provided, and the method of establishing a digital model of the existing turbine and the preliminary solution of the low inertia turbine includes: selecting the existing turbine with required size, removing partial material on the wheel back of the existing turbine, enabling the rest part of the wheel back to form a plurality of reinforcing ribs, setting the type, the number, the width and the thickness of the reinforcing ribs and the distribution center and the draft angle of the reinforcing ribs according to the factors of the number of blades, the blade profile of the turbine, the size of a hub and the like of the existing turbine, forming a preliminary scheme of the low-rotational-inertia turbine, and establishing a digital model of the existing turbine and the preliminary scheme of the low-rotational-inertia turbine.
Optionally, the digital model includes a CFD model, a temperature field analysis model, and a modal analysis model.
Optionally, the performing thermo-mechanical stress analysis and modal stress analysis on the preliminary solution of the existing turbine and the low moment of inertia turbine comprises: performing CFD analysis on a flow channel formed between the preliminary scheme of the existing turbine and the low-moment-of-inertia turbine and a corresponding turbine box through the CFD model; performing FEA temperature field analysis on the turbine box, the turbine and corresponding accessories through the temperature field analysis model; performing multiple fluid-solid coupling iterations on the CFD analysis model and the temperature field analysis model to obtain the temperature field distribution of the initial scheme of the existing turbine and the low-rotational-inertia turbine; applying the temperature field distribution to the preliminary solutions of the existing turbine and the low-rotational-inertia turbine, and substituting the centrifugal loads when the preliminary solutions of the existing turbine and the low-rotational-inertia turbine rotate to construct a thermal-mechanical stress analysis model of the preliminary solutions of the existing turbine and the low-rotational-inertia turbine, and obtaining the thermal-mechanical stress of each node of the preliminary solutions of the existing turbine and the low-rotational-inertia turbine through the thermal-mechanical stress analysis model; and obtaining free modes of each order of the preliminary scheme of the existing turbine and the low-rotational-inertia turbine through the mode analysis model, so as to obtain modal stress of each order of each node of the preliminary scheme of the existing turbine and the low-rotational-inertia turbine.
Optionally, the processing the thermo-mechanical stress analysis results and the modal stress analysis results comprises: normalizing and superposing thermal-mechanical stress and first-order modal stress corresponding to each node of the existing turbine, normalizing and superposing the thermal-mechanical stress and the first-order modal stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine, comparing two superposed results, if the difference value is greater than the design requirement limit value, adjusting the position distribution, the number, the thickness, the width, the distribution center and the draft slope of reinforcing ribs in the preliminary scheme of the low-rotational-inertia turbine, and reestablishing a digital model, thermal-mechanical stress analysis and modal stress analysis, and processing the thermal-mechanical stress analysis result and the modal stress analysis result on the adjusted low-rotational-inertia turbine; if the difference is lower than the design requirement limit, the low-rotational-inertia turbine is considered to have good strength and reliability and meet the design requirement, so that the low-rotational-inertia design method provided by the invention can be used for guiding the production and the manufacture of the low-rotational-inertia turbine. The normalized superposition method comprises the following steps: dividing the thermal-mechanical stress corresponding to each node of the existing turbine by the maximum value of the thermal-mechanical stress in each node to obtain a normalization result of the thermal-mechanical stress of each node of the existing turbine; dividing the first-order modal stress corresponding to each node of the existing turbine by the maximum value of the first-order modal stress in each node to obtain a normalization result of the first-order modal stress of each node of the existing turbine; adding the thermal-mechanical stress normalization result corresponding to each node and the first-order modal stress normalization result; meanwhile, dividing the thermal-mechanical stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine by the maximum value of the thermal-mechanical stress in each node respectively to obtain a normalization result of the thermal-mechanical stress of each node of the preliminary scheme of the low-rotational-inertia turbine; dividing the first-order modal stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine by the maximum value of the first-order modal stress in each node to obtain a normalization result of the first-order modal stress of each node of the preliminary scheme of the low-rotational-inertia turbine; and adding the thermal-mechanical stress normalization result corresponding to each node and the first-order modal stress normalization result.
In some alternative embodiments, the processing the thermo-mechanical stress analysis results and the modal stress analysis results comprises: normalizing and superposing the thermal-mechanical stress corresponding to each node of the existing turbine and the modal stress of the required order, performing normalized and superposed on the thermal-mechanical stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine and the modal stress of the required order, comparing two superposed results, if the difference value is greater than the design requirement limit value, adjusting the position distribution, the number, the thickness, the width, the distribution center and the draft slope of reinforcing ribs in the preliminary scheme of the low-rotational-inertia turbine, and re-establishing a digital model, performing thermal-mechanical stress analysis and modal stress analysis and processing the thermal-mechanical stress analysis result and the modal stress analysis result on the adjusted low-rotational-inertia turbine; if the difference is lower than the design requirement limit, the low-rotational-inertia turbine is considered to have good strength and reliability and meet the design requirement, so that the low-rotational-inertia design method provided by the invention can be used for guiding the production and the manufacture of the low-rotational-inertia turbine. The normalized superposition method comprises the following steps: dividing the thermal-mechanical stress corresponding to each node of the existing turbine by the maximum value of the thermal-mechanical stress in each node to obtain a normalization result of the thermal-mechanical stress of each node of the existing turbine; dividing the modal stress of the required order corresponding to each node of the existing turbine by the maximum value of the modal stress of the required order in each node to obtain a normalization result of the modal stress of the required order of each node of the existing turbine; adding the thermal-mechanical stress normalization result corresponding to each node and the modal stress normalization result of the required order; meanwhile, dividing the thermal-mechanical stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine by the maximum value of the thermal-mechanical stress in each node respectively to obtain a normalization result of the thermal-mechanical stress of each node of the preliminary scheme of the low-rotational-inertia turbine; dividing the required order modal stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine by the maximum value of the required order modal stress in each node to obtain the normalization result of the required order modal stress of each node of the preliminary scheme of the low-rotational-inertia turbine; and adding the thermal-mechanical stress normalization result corresponding to each node and the modal stress normalization result of the required order.
Optionally, the reinforcing ribs are radially and uniformly distributed in the center.
From the above, the low-rotational-inertia turbine obtained by the design method of the low-rotational-inertia turbine provided by the invention has good mechanical strength and service life, and compared with the existing turbine, the weight of the low-rotational-inertia turbine is reduced by more than 8%, the rotational inertia is reduced by more than 5%, and the low-speed response of a supercharging system can be effectively improved; compared with the mass center of a rotating system consisting of the low-rotational-inertia turbine and the corresponding component, the mass center of the rotating system consisting of the low-rotational-inertia turbine and the corresponding component deviates more than 2mm towards the air compression end floating bearing, so that the mechanical efficiency and the reliability of the bearing system are effectively improved, and the efficiency of the supercharger is improved; meanwhile, compared with the existing turbine, the low-rotational-inertia turbine removes partial materials on the back of the turbine, so that the wall thickness difference on the turbine back structure is reduced, the size of the hub skirt is reduced, the probability of solidification defects generated in the process of casting and molding the turbine is reduced, the overall uniformity of the turbine is improved, and the production cost of the turbine is reduced.
Drawings
FIG. 1 is a flow chart of a method for designing a low moment of inertia turbine according to an embodiment of the present invention;
FIG. 2 is a wheel back structure view of a low moment of inertia turbine according to embodiment 1 of the present invention;
FIG. 3 is a wheel back structure view of a low moment of inertia turbine according to embodiment 2 of the present invention;
FIG. 4 is a wheel back structure view of a low moment of inertia turbine according to embodiment 3 of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
As shown in fig. 1, which is a flowchart of a low rotational inertia turbine design method according to an embodiment of the present invention, the flowchart of the low rotational inertia turbine design method according to the embodiment of the present invention includes the following steps:
1. setting preliminary plan
The study of low speed responsiveness has to be explained by energy balance equations. The supercharger model and the engine model are linked through a capacity balance equation, the supercharger model establishes an energy balance relationship through a turbine end and a compressor end, and the energy balance equation of the supercharger turbine end is as follows:
Qe(t)＝Qc(t)+Qm(t)+Qoutside(t)+Ip(ω/2π)(Δω/Δt)
Qe(t): the energy output by the supercharger or the exhaust energy input into the supercharger by the engine;
Qc(t): energy input by the compressor;
Qm(t): mechanical losses;
Qoutside(t): energy loss of supercharger heat radiation, convection heat exchange and supercharger cooling system
Ip: moment of inertia of turbine；
ω: the angular velocity of the turbine;
in the energy balance equation, the energy output by the supercharger or the exhaust energy input into the supercharger by the engine is kept unchanged, the energy input by the compressor and the energy loss of the heat radiation, the heat convection and the cooling system of the supercharger are kept unchanged, the mass center of the turbine rotor system deviates to the end of the compressor, the mechanical loss of the bearing system is reduced, the rotational inertia is reduced, the angular acceleration of the turbine is improved, the responsiveness of the supercharger is improved when the angular acceleration is improved, particularly, the energy output by the supercharger or the exhaust energy input into the supercharger by the engine is smaller when the speed is low, and the reduction of the rotational inertia of the turbine is favorable for improving the low-speed responsiveness.
According to the analysis result, selecting an existing turbine with a required size, removing part of materials on the wheel back of the existing turbine, enabling the remaining part of the wheel back to form a plurality of reinforcing ribs in a central radial shape, setting the type, the number, the width and the thickness of the reinforcing ribs and the height of the drop between the center and the periphery of the reinforcing ribs of the wheel back of the low-rotational-inertia turbine according to the number of blades of the existing turbine, the blade type of the turbine, the size of a hub and other factors, forming a preliminary scheme of the low-rotational-inertia turbine, and establishing a digital model of the preliminary scheme of the existing turbine and the low-rotational-inertia turbine, wherein the digital model comprises a CFD (Computational Fluid Dynamics) model, a temperature field analysis model and a modal analysis model.
2. Thermo-mechanical stress analysis and modal analysis
a. Performing CFD analysis on a flow channel formed between the preliminary scheme of the existing turbine and the low-moment-of-inertia turbine and a corresponding turbine box through the CFD model; performing FEA (Finite Element Analysis) temperature field Analysis on a turbine box, a turbine and corresponding accessories at the turbine end through the temperature field Analysis model; performing multiple fluid-solid coupling iterations on the CFD analysis model and the temperature field model to obtain the temperature field distribution of the initial scheme of the existing turbine and the low-rotational-inertia turbine;
b. applying the temperature field distribution to the preliminary solution of the existing turbine and the low-moment-of-inertia turbine, and substituting the centrifugal load when the preliminary solution of the existing turbine and the low-moment-of-inertia turbine rotates to construct a thermal-mechanical stress model of the preliminary solution of the existing turbine and the low-moment-of-inertia turbine, and obtaining the thermal-mechanical stress of the preliminary solution of the existing turbine and the low-moment-of-inertia turbine through the thermal-mechanical stress model;
c. and obtaining free modal analysis of the preliminary schemes of the existing turbine and the low-rotational-inertia turbine through the modal analysis model, so as to obtain modal stress of each node of the preliminary schemes of the existing turbine and the low-rotational-inertia turbine at different orders.
3. Comparative analysis
Normalizing and superposing the thermal-mechanical stress and the modal stress of the existing turbine, normalizing and superposing the thermal-mechanical stress and the modal stress of the preliminary scheme of the low-rotational-inertia turbine, comparing the two superposition results, adjusting the position distribution, the number, the thickness and the width of reinforcing ribs, the distribution center and the draft angle of a drawing die in the preliminary scheme of the low-rotational-inertia turbine if the difference value is greater than the design requirement limit value, and repeating the steps 1 and 2 on the adjusted low-rotational-inertia turbine; if the difference is lower than the preset design requirement limit value, the low-rotational-inertia turbine is considered to have good strength and reliability and meet the design requirement, and therefore the low-rotational-inertia turbine can be guided to produce and manufacture according to the design method of the low-rotational-inertia turbine provided by the invention.
The normalized superposition method comprises the following steps: dividing the thermal-mechanical stress corresponding to each node of the existing turbine by the maximum value of the thermal-mechanical stress in all the nodes to obtain the normalization result of the thermal-mechanical stress of each node of the existing turbine; dividing the first-order modal stress corresponding to each node of the existing turbine by the maximum value of the first-order modal stress in all the nodes to obtain a normalization result of the first-order modal stress of each node of the existing turbine; adding the thermal-mechanical stress normalization result corresponding to each node and the first-order modal stress normalization result;
meanwhile, dividing the thermal-mechanical stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine by the maximum value of the thermal-mechanical stress in all the nodes to obtain a normalization result of the thermal-mechanical stress of each node of the preliminary scheme of the low-rotational-inertia turbine; dividing the first-order modal stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine by the maximum value of the first-order modal stress in all the nodes to obtain a normalization result of the first-order modal stress of each node of the preliminary scheme of the low-rotational-inertia turbine; and adding the thermal-mechanical stress normalization result corresponding to each node and the first-order modal stress normalization result.
In some optional embodiments, it is necessary to consider modal stress of high order, and the method of normalized superposition includes: dividing the thermal-mechanical stress corresponding to each node of the existing turbine by the maximum value of the thermal-mechanical stress in all the nodes to obtain the normalization result of the thermal-mechanical stress of each node of the existing turbine; respectively dividing the modal stress of the required order corresponding to each node of the existing turbine by the maximum value of the modal stress of the required order in all the nodes to obtain a normalization result of the modal stress of the required order of each node of the existing turbine; adding the thermal-mechanical stress normalization result corresponding to each node and the modal stress normalization result of the required order;
meanwhile, dividing the thermal-mechanical stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine by the maximum value of the thermal-mechanical stress in all the nodes to obtain a normalization result of the thermal-mechanical stress of each node of the preliminary scheme of the low-rotational-inertia turbine; respectively dividing the modal stress of the required order corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine by the maximum value of the modal stress of the required order in all the nodes to obtain the normalization result of the modal stress of the required order of each node of the preliminary scheme of the low-rotational-inertia turbine; and adding the thermal-mechanical stress normalization result corresponding to each node and the modal stress normalization result of the required order.
The low-rotational-inertia turbine obtained by the design method of the low-rotational-inertia turbine provided by the embodiment of the invention has good mechanical strength and service life, compared with the existing turbine, the weight of the low-rotational-inertia turbine is reduced by more than 8%, the rotational inertia is reduced by more than 5%, and the low-speed responsiveness of a supercharging system can be effectively improved; compared with the mass center of a rotating system consisting of the existing turbine and the corresponding component, the mass center of the rotating system consisting of the low-rotational-inertia turbine and the corresponding component deviates more than 2mm towards the compressor end floating bearing, so that the mechanical efficiency and reliability of the bearing system are effectively improved, and the efficiency of the supercharger is improved; meanwhile, compared with the existing turbine, the low-rotational-inertia turbine removes partial materials on the back of the turbine, so that the wall thickness difference on the turbine back structure is reduced, the size of the hub skirt is reduced, the probability of solidification defects generated in the process of casting and molding the turbine is reduced, the overall uniformity of the turbine is improved, and the production cost of the turbine is reduced.
Example 1:
as shown in fig. 2, in the wheel back structure diagram of a low moment of inertia turbine provided in embodiment 1 of the present invention, white portions in the right drawing are removed from the existing turbine, and shaded portions are the remaining wheel back and the reinforcing ribs. Adopt the structure that 5 central transmission form strengthening ribs evenly arranged, the strengthening rib cross-section is the rectangle, every the width and the thickness of each section on the strengthening rib are equal.
Compared with the traditional turbine, the low-rotational-inertia turbine provided by the embodiment 1 of the invention has the advantages that the weight is reduced by 9%, the rotational inertia is reduced by 7%, compared with the mass center of a rotating system formed by corresponding components, the rotating system of the traditional turbine deviates 2.2mm from a floating bearing at the end of a compressor, and the low-speed responsiveness and the mechanical efficiency of a supercharger are effectively improved.
Example 2:
as shown in fig. 3, a wheel back structure diagram of a low inertia moment turbine provided in embodiment 2 of the present invention is a structure in which 8 central radial reinforcing ribs are uniformly arranged, the cross section of each reinforcing rib is circular, and the diameter of each reinforcing rib gradually decreases from the center to the outside.
Compared with the traditional turbine, the low-rotational-inertia turbine provided by the embodiment 2 of the invention has the advantages that the weight is reduced by 12%, the rotational inertia is reduced by 9%, compared with the mass center of a rotating system formed by corresponding components, the rotating system of the traditional turbine deviates 2.5mm from a floating bearing at the end of a compressor, and the low-speed responsiveness and the mechanical efficiency of a supercharger are effectively improved.
Example 3:
as shown in fig. 4, a wheel back structure diagram of a low moment of inertia turbine provided in embodiment 3 of the present invention is a wheel back structure diagram of a low moment of inertia turbine, where the low moment of inertia turbine adopts a structure in which 8 central radial reinforcing ribs are uniformly arranged, the cross section of each reinforcing rib is rectangular, and the width of each reinforcing rib gradually decreases from the center to the outside, and the thickness remains unchanged.
Compared with the traditional turbine, the low-rotational-inertia turbine provided by the embodiment 3 of the invention has the advantages that the weight is reduced by 8%, the rotational inertia is reduced by 6%, compared with the mass center of a rotating system formed by corresponding components, the rotating system of the traditional turbine deviates 2.1mm from a floating bearing at the end of a compressor, and the low-speed responsiveness and the mechanical efficiency of a supercharger are effectively improved.
Those of ordinary skill in the art will understand that: the invention is not to be considered as limited to the specific embodiments thereof, but is to be understood as being modified in all respects, all changes and equivalents that come within the spirit and scope of the invention.
Claims (6)
1. A low rotational inertia turbine design method, comprising:
setting a preliminary scheme of a low-rotational-inertia turbine, and establishing a digital model of an existing turbine and the preliminary scheme of the low-rotational-inertia turbine; wherein the establishing a digital model of a preliminary solution to the existing turbine and the low moment of inertia turbine comprises: selecting the existing turbine with required size, removing part of materials on the wheel back of the existing turbine, enabling the rest part of the wheel back to form a plurality of reinforcing ribs, setting the type, the number, the width and the thickness of the reinforcing ribs, the distribution center and the draft angle of the reinforcing ribs according to the factors such as the number of blades of the existing turbine, the blade profile of the turbine, the size of a hub and the like, forming a preliminary scheme of the low-rotational-inertia turbine, and establishing a digital model of the preliminary scheme of the existing turbine and the low-rotational-inertia turbine;
performing thermo-mechanical stress and modal stress analysis on the preliminary solution for the existing turbine and the low moment of inertia turbine;
processing the thermal-mechanical stress analysis result and the modal stress analysis result to obtain a difference value of the strength of the low-rotational-inertia turbine and the strength of the existing turbine, adjusting the preliminary scheme of the low-rotational-inertia turbine, and performing the thermal-mechanical stress analysis and the modal analysis again until the difference value between the adjusted preliminary scheme strength of the low-rotational-inertia turbine and the strength of the existing turbine is lower than a preset limit value;
adopting the adjusted preliminary scheme of the low-rotational-inertia turbine to produce and manufacture the low-rotational-inertia turbine;
the performing thermo-mechanical stress analysis and modal stress analysis on the preliminary solution of the existing turbine and the low moment of inertia turbine comprises:
performing CFD analysis on a flow channel formed between the preliminary scheme of the existing turbine and the low-rotational-inertia turbine and a corresponding turbine box through a CFD model; FEA temperature field analysis is carried out on the turbine box, the turbine and corresponding accessories through a temperature field analysis model; performing multiple fluid-solid coupling iterations on the CFD model and the temperature field analysis model to obtain temperature field distribution of the initial scheme of the existing turbine and the low-rotational-inertia turbine;
applying the temperature field distribution to the preliminary solutions of the existing turbine and the low-rotational-inertia turbine, and substituting the centrifugal loads when the preliminary solutions of the existing turbine and the low-rotational-inertia turbine rotate to construct a thermal-mechanical stress analysis model of the preliminary solutions of the existing turbine and the low-rotational-inertia turbine, and obtaining the thermal-mechanical stress of each node of the preliminary solutions of the existing turbine and the low-rotational-inertia turbine through the thermal-mechanical stress analysis model;
and obtaining free modes of each order of the preliminary scheme of the existing turbine and the low-rotational-inertia turbine through a mode analysis model, so as to obtain modal stress of each order of each node of the preliminary scheme of the existing turbine and the low-rotational-inertia turbine.
2. The method of claim 1, wherein processing the thermo-mechanical stress analysis results and modal stress analysis results comprises:
normalizing and superposing thermal-mechanical stress and first-order modal stress corresponding to each node of the existing turbine, normalizing and superposing the thermal-mechanical stress and the first-order modal stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine, comparing two superposed results, if the difference value is greater than the design requirement limit value, adjusting the position distribution, the number, the thickness, the width, the distribution center and the draft slope of reinforcing ribs in the preliminary scheme of the low-rotational-inertia turbine, and reestablishing a digital model, thermal-mechanical stress analysis and modal stress analysis, and processing the thermal-mechanical stress analysis result and the modal stress analysis result on the adjusted low-rotational-inertia turbine; and if the difference is lower than the design requirement limit value, the low-rotational-inertia turbine is considered to have good strength and reliability and meet the design requirement.
3. The method of claim 2, wherein the thermo-mechanical stress corresponding to each node of the existing turbine is divided by the maximum value of the thermo-mechanical stress in each node, respectively, to obtain a normalized result of the thermo-mechanical stress of each node of the existing turbine; dividing the first-order modal stress corresponding to each node of the existing turbine by the maximum value of the first-order modal stress in each node to obtain a normalization result of the first-order modal stress of each node of the existing turbine; adding the thermal-mechanical stress normalization result corresponding to each node and the first-order modal stress normalization result;
meanwhile, dividing the thermal-mechanical stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine by the maximum value of the thermal-mechanical stress in each node respectively to obtain a normalization result of the thermal-mechanical stress of each node of the preliminary scheme of the low-rotational-inertia turbine; dividing the first-order modal stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine by the maximum value of the first-order modal stress in each node to obtain a normalization result of the first-order modal stress of each node of the preliminary scheme of the low-rotational-inertia turbine; and adding the thermal-mechanical stress normalization result corresponding to each node and the first-order modal stress normalization result.
4. The method of claim 1, wherein processing the thermo-mechanical stress analysis results and modal stress analysis results comprises:
normalizing and superposing the thermal-mechanical stress corresponding to each node of the existing turbine and the modal stress of the required order, performing normalized and superposed on the thermal-mechanical stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine and the modal stress of the required order, comparing two superposed results, if the difference value is greater than the design requirement limit value, adjusting the position distribution, the number, the thickness, the width, the distribution center and the draft slope of reinforcing ribs in the preliminary scheme of the low-rotational-inertia turbine, and re-establishing a digital model, performing thermal-mechanical stress analysis and modal stress analysis and processing the thermal-mechanical stress analysis result and the modal stress analysis result on the adjusted low-rotational-inertia turbine; and if the difference is lower than the design requirement limit value, the low-rotational-inertia turbine is considered to have good strength and reliability and meet the design requirement.
5. The method of claim 4, wherein the thermo-mechanical stress corresponding to each node of the existing turbine is divided by the maximum value of the thermo-mechanical stress in each node to obtain a normalized result of the thermo-mechanical stress of each node of the existing turbine; dividing the modal stress of the required order corresponding to each node of the existing turbine by the maximum value of the modal stress of the required order in each node to obtain a normalization result of the modal stress of the required order of each node of the existing turbine; adding the thermal-mechanical stress normalization result corresponding to each node and the modal stress normalization result of the required order;
meanwhile, dividing the thermal-mechanical stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine by the maximum value of the thermal-mechanical stress in each node respectively to obtain a normalization result of the thermal-mechanical stress of each node of the preliminary scheme of the low-rotational-inertia turbine; dividing the required order modal stress corresponding to each node of the preliminary scheme of the low-rotational-inertia turbine by the maximum value of the required order modal stress in each node to obtain the normalization result of the required order modal stress of each node of the preliminary scheme of the low-rotational-inertia turbine; and adding the thermal-mechanical stress normalization result corresponding to each node and the modal stress normalization result of the required order.
6. The method of claim 1, wherein the ribs are evenly distributed radially from the center.
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| CN104899878A (en) * | 2015-05-21 | 2015-09-09 | 北京工业大学 | Method for detecting reasonable establishment of locomotive turbocharger rotor three-dimensional model |
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| CN102345558A (en) * | 2011-09-13 | 2012-02-08 | 南通大学 | Spiral vertical axis wind turbine blade for wind power generation and machining method |
| CN104899878A (en) * | 2015-05-21 | 2015-09-09 | 北京工业大学 | Method for detecting reasonable establishment of locomotive turbocharger rotor three-dimensional model |
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