CN102364479A - Design analysis method for gas turbine gas inlet device - Google Patents
Design analysis method for gas turbine gas inlet device Download PDFInfo
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- CN102364479A CN102364479A CN2011103213788A CN201110321378A CN102364479A CN 102364479 A CN102364479 A CN 102364479A CN 2011103213788 A CN2011103213788 A CN 2011103213788A CN 201110321378 A CN201110321378 A CN 201110321378A CN 102364479 A CN102364479 A CN 102364479A
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Abstract
The invention relates to a design analysis method for a gas turbine gas inlet device, which belongs to the technical field of gas turbines. The precise stimulating analysis is carried out on the working conditions of a local part and a section of a gas inlet device by adopting a computer stimulating technology. The method comprises the following steps of: (1) model establishment: firstly, primarily designing a two-dimensional viewgraph and carrying out ANSYS three-dimensional modeling on the part needing to be calculated and analysis under the condition of confirming the sizes of all parts of the two-dimensional viewgraph; carrying out finite element division of an analysis object according to the concrete technical requirement and precision requirement needing analysis and calculation of the analysis object so that a computer can analyze and calculate each unit by utilizing enough resources; and (2) loading analysis: A. strength and linear buckling analysis: containing stress distribution, displacement distribution and load factors in calculating results; B. flow field analysis: analyzing the static pressure, total pressure and speed flow line of a system and respectively obtaining a speed vector distribution picture, a static pressure cloud picture and a total pressure cloud picture of a typical section.
Description
Technical field
The invention belongs to the gas turbine technology field, particularly relate to a kind of gas turbine inlet air Design of device analytical approach.This method is mainly used in special-purpose test bay in gas turbine ground and gas-turbine generator set construction, is the indispensable equipment of gas turbine application.
Background technology
At present, under the situation of emulation technology that do not use a computer, existing gas turbine inlet air Design of device is to calculate through manual simple also dependence experience; Therefore, significant limitation is arranged.Analyze such as carry out manual intensity, rigidity, flow field, thermal technology at comparatively complicated parts, runner, pipeline etc., workload is huge with regard to existing, the problem of conclusion correctness and error size.
The equipment of test bay has test bay specialized equipment and gas turbine from two types of carrying devices.Admission gear is the very important equipment of test bay, and it mainly acts on and providing to gas turbine cleaning, clean, stable air; The success or not of its development is related to the accuracy whether gas turbine can correctly go out merit and each measurement point numerical value.Therefore, adopting advanced at present ANSYS software is necessary to the correct setting that it carries out analog stream field analysis, the analysis of simulation flow resistance, structure analysis and each point position.
ANSYS software is that merge structure mechanics, fluid mechanics, thermodynamics, electromagnetics, circuitry, sound field are analyzed the large-scale general finite element analysis software in one; Therefore, it can be widely used in Aero-Space, auto industry, biomedicine, science of bridge building, construction work, hydraulic engineering, electronic product, heavy-duty machinery, MEMS, sports apparatus, daily electrical home appliance etc.Software mainly comprises pre-processing module, analytical calculation module and post-processing module.
Veteran designer, analyst can through the finite element analysis and the computing machine hydrodynamic analysis of computer model, make to the control of design more accurate according to hypothesis.
Summary of the invention
To the problem that prior art exists, the present invention provides a kind of employing computer simulation technique, can carry out the gas turbine inlet air Design of device analytical approach of accurate simulation analysis to certain part of admission gear, the operating mode in certain cross section.
To achieve these goals, the present invention adopts following technical scheme, and a kind of gas turbine inlet air Design of device analytical approach comprises the steps:
Step 1: set up model;
At first, carry out the primary design two dimension view, under the situation of having confirmed each spot size of two dimension view, the ANSYS three-dimensional modeling is carried out at the position that needs calculate and analyze;
Carry out the finite element division of analytic target according to the concrete technical requirement of analytic target, the accuracy requirement that needs to analyze and calculate, make computing machine can utilize enough resources that each unit is analyzed and calculated;
Step 2: load analysis;
Steps A: intensity and linear buckling analysis;
To the system support analysis, use beam element and shell unit to set up computation model, result of calculation comprises stress distribution, Displacements Distribution and load factor;
Step B: flow field analysis;
The static pressure of analytic system, stagnation pressure and speed streamline, and draw velocity distribution plan, static pressure cloud atlas and the stagnation pressure cloud atlas of typical section respectively.
Beneficial effect of the present invention:
Design and analysis methods of the present invention is carried out Accurate Analysis and design computation through microcomputer modelling analysis, simulation calculation to the important part of gas turbine inlet air device, cross section; Can carry out accurate simulation analysis to certain part of admission gear, the operating mode in certain cross section, overall structural design is had great function.
Description of drawings
Fig. 1 is the structural representation of the gas turbine inlet air device of one embodiment of the present of invention;
Fig. 2 is the A-A cut-open view of Fig. 1;
Fig. 3 is the C-C cut-open view of Fig. 1;
Fig. 4 is the B-B cut-open view of Fig. 1;
Fig. 5 is the stress envelope of operating mode 101;
Fig. 6 is the stress envelope of operating mode 102;
Fig. 7 is the stress envelope of operating mode 103;
Fig. 8 is the stress envelope of operating mode 101 supports;
Fig. 9 is the stress envelope of operating mode 102 supports;
Figure 10 is the stress envelope of operating mode 103 supports;
Figure 11 is the Displacements Distribution figure of operating mode 101;
Figure 12 is the Displacements Distribution figure of operating mode 102;
Figure 13 is the Displacements Distribution figure of operating mode 103;
Figure 14 is the load factor figure of operating mode 101;
Figure 15 is the load factor figure of operating mode 102;
Figure 16 is the load factor figure of operating mode 103;
Figure 17 is the mesh refinement figure in admission gear exit;
Figure 18 is the mesh refinement figure in admission gear exit;
Figure 19 is the mesh refinement figure in admission gear exit;
Figure 20 is the mesh refinement figure in admission gear exit;
Figure 21 is an air inlet volute stagnation pressure cloud atlas;
Figure 22 is local stagnation pressure cloud atlas;
Figure 23 is the air inlet volute speed vector figure;
Figure 24 is local velocity's polar plot;
Figure 25 is the air inlet volute motion pattern;
Figure 26 is local flow's line chart;
Figure 27 is whole finite element model figure;
Figure 28 is support finite element model figure;
Wherein, 1-air inlet volute base, the 2-air inlet volute, the 3-interface is flexible coupling, 4-air inlet elbow, 5-air inlet straight section, 6-structural steel, 7-air inlet kuppe, 8-inlet air filtration cover.
Embodiment
Embodiment 1:
A kind of gas turbine inlet air Design of device analytical approach comprises the steps:
Step 1: set up model;
At first, carry out the primary design two dimension view, under the situation of having confirmed each spot size of two dimension view, the ANSYS three-dimensional modeling is carried out at the position that needs calculate and analyze;
Carry out the finite element division of analytic target according to the concrete technical requirement of analytic target, the situation such as accuracy requirement that need to analyze and calculate, make computing machine can utilize enough resources that each unit is analyzed and calculated;
The structure analysis and the course of work:
Gas turbine test bay admission gear comprises: inlet air filtration cover, air inlet kuppe, air inlet straight section, air inlet elbow, interface are flexible coupling, air inlet volute, air inlet volute base and structural steel etc., like Fig. 1～shown in Figure 4.
Air is flexible coupling through inlet air filtration cover, air inlet kuppe, air inlet straight section, air inlet elbow, interface successively, gets into air inlet volute (seeing arrow indication among Fig. 1).In air inlet volute, airflow direction is by radially becoming axial entering gas turbine inlet air casing.
Gas turbine inlet air is higher to temperature, flow, the pressure loss, the isoparametric technical requirement of filtering accuracy, and these parameters directly have influence on the air inlet quality, have influence on the merit that of gas turbine.Therefore, to pay much attention to CALCULATION OF PARAMETERS.
1, inlet air filtration cover
The inlet air filtration cover is arranged on the air intake opening place of admission gear, through the inlet air filtration cover skeleton of Φ 8mm stainless steel round steel composition semicircle, to increase effective air inlet area.Be equipped with the mesh size on the inlet air filtration cover skeleton and be the nylon wire of 5mm * 5mm, the air inlet requirement when satisfying the test run of combustion machine with the gas that guarantees the entering air intake duct.Nylon wire is connected on the flange of inlet air filtration cover through bolt and pressing plate; The weight of inlet air filtration cover is about 56kg.
2, air inlet kuppe
The air inlet kuppe is set to expanded form, to reduce the flow resistance of air intake opening.Air inlet kuppe outside plate is the 1Cr13 corrosion resistant plate of 4.0mm; The weight of air inlet kuppe is about 122kg.
3, air inlet straight section
Air inlet straight section outside plate is the 1Cr13 corrosion resistant plate of 4.0mm, and outside plate is laid angle stiffener, to guarantee the smooth of plate face.The sectional area of air inlet straight section is about 2.0m
2, gas flow rate is about 12.0m/s in the air intake duct.Be respectively arranged with four measurement of discharge interfaces on the upper and lower surface of the air inlet straight section in the middle of being arranged on; The weight of air inlet straight section is about 707kg.
4, air inlet elbow
Air inlet elbow outside plate is the 1Cr13 corrosion resistant plate of 4.0mm, and outside plate is laid angle stiffener, to guarantee the plate surface evenness, is provided with bearing in the both sides of air inlet elbow, so that be supported on the structural steel; The air inlet elbow is connected fixing with structural steel through bolt.Air inlet elbow internal diameter is set to 1022mm, and is measure-alike with air inlet straight section cross-sectional width, can well guarantee the even flow field degree of burning machine inlet section like this; The weight of air inlet elbow is about 726kg.
5, air inlet volute
Air inlet volute is set to one-piece construction, and outside plate is the 1Cr13 corrosion resistant plate of 5.0mm.Slab is set on the outside plate to be guaranteed the flatness of plate face and prevents the vibrations of combustion machine when operation plate face.Air inlet volute is connected through the mode that is flexible coupling with combustion machine air intake opening.The air inlet volute side is provided with access door, and the clean mouth of access door is of a size of 600mm * 1000mm (wide * height).Access door is connected with air inlet volute through swing bolt, and is convenient to guarantee the access door switch.The neoprene pad that is equipped with 4.0mm between access door and spiral case is provided with four illuminating lamp hooks to guarantee the sealing of access door on the inner two side walls of air inlet volute top.During maintenance, can hand-held illuminating lamp be hung on the illuminating lamp hook.The air inlet volute both sides are respectively arranged with two place's temperature detection mouths and the mouth of stagnation pressure detection everywhere.
Step 2: load analysis;
Steps A: intensity and linear buckling analysis;
Gas handling system (mainly being made up of H shaped steel, joist steel, angle steel and steel plate) is supported analysis, use beam element and shell unit to set up computation model, result of calculation comprises stress distribution, Displacements Distribution and load factor;
A) geometric parameter of model
Set up the three-dimensional geometry solid model at the ANSYS environment according to two-dimentional drawing;
B) computation model
Three-dimensional model is divided grid, set up finite element analysis model, whole finite element model is seen Figure 27, and the support finite element model is seen Figure 28.Shell unit is adopted in air inlet, and the shaped steel brace summer adopts beam element.
C) material properties is set
Material standard GB/T700-2006.
The Q235 material parameter is seen table 1
Table 1 material properties
| Attribute | Value | Unit |
| Elastic modulus | 2.06E11 | 【Pa】 |
| Poisson ratio | 0.3 | |
| Density | 7850 | 【Kg/m 3】 |
D) load
(1) from heavy load
From the acting force of heavy load use vertical direction g, reach is a total system.
(2) geological process
According to " seismic design provision in building code " (GB50011-2001) (version in 2008), ShenYang, Liaoning Province (9 districts under city administration) seismic fortification intensity is 7 degree, and designing basic earthquake accekeration is 0.10g, and the design earthquake is grouped into first group.
According to " seismic design provision in building code " (GB50011-2001) (version in 2008) to find fortification intensity be 7 when spending, α max=0.08;
The structural damping ratio is got ζ=0.01;
η2＝1+(0.05-ζ)/(0.06+1.7ζ)＝1.52
α＝η2αmax＝0.1216
Horizontal acceleration a level=ag=1.19m/s
2
Vertically acceleration a vertically=0.65*ag=0.78m/s
2
The division operating mode is following:
E) constraint
All degree of freedom of 4 supporting legs of tie bracket and ground junction;
F) analysis result
(1) stress of integral body is seen table 2
Table 2 integrated stress result
Fig. 5, Fig. 6, Fig. 7 are respectively the stress distribution of operating mode 101,102,103.
(2) stress of support is seen table 3
Table 3 support stress result
The Intensity Design value of Q235 is MPa (according to GB50017-2003).
Fig. 8, Fig. 9, Figure 10 are respectively the stress distribution of operating mode 101,102,103 supports.
(3) table 4 is seen in whole displacement
The whole displacement result of table 4
The amount of deflection allowable value of flexural member is member span 1/400 (according to GB50017-2003).Figure 11, Figure 12, Figure 13 are respectively the Displacements Distribution of operating mode 101,102,103.
(4) load factor is seen table 5
The working stability safety coefficient of structure is 1.8～3.0 (according to " mechanical design handbook " first volumes).
Table 5 load factor
| | Whole | 1 rank load factor | Allow buckling safety factor |
| 101 | 3.52 | 3 | |
| 102 | 3.02 | 3 | |
| 103 | 3.14 | 3 |
Figure 14, Figure 15, Figure 16 are respectively the load factor of operating mode 101,102,103.
G) conclusion
Maximum stress under the various operating modes is less than the maximum stress that allows, and the maximum displacement under the various operating modes is less than the maximum displacement that allows, and whole load factor is greater than the buckling safety factor that allows.
Step B: flow field analysis;
Flow resistance loss is the important indicator of air inlet volute, therefore when design, must pay attention to.The static pressure of analytic system, stagnation pressure and speed streamline are for the design typification of air inlet volute provides theoretical foundation; And draw velocity distribution plan, static pressure cloud atlas and the stagnation pressure cloud atlas of several typical sections respectively.
The flow resistance computing method are selected the CFD software Fluent analytical calculation of widespread use on the engineering for use.Fluent is used to simulate the fluid with complex appearance flow and heat conducting computer program, calculation procedures such as preprocessor GAMBIT that generates comprising geometric analogy and grid and FLUENT solver.
A) modeling and data analysis
Use UG to set up 1/2 computation model according to data that provide and drawing data, and use Gambit to divide grid, and, see Figure 17, Figure 18, Figure 19, Figure 20 admission gear exit mesh refinement.
B) design conditions and result
The flow that the entrance and exit of admission gear is set is 27.6kg/s, and skin friction drag is disregarded, and it is that no rubbing manipulation is to constraint that split is set.
Adopt the difference scheme of single order precision in the calculating, solving precision is at 1E-3; However, residual error also has downtrending.Through calculating, data are got the weighted mean of import and export, and concrete outcome is as shown in the table:
| Stagnation pressure Pa | Static pressure Pa | Flow velocity m/s | Flow kg/s | |
| Import | -3 | -35 | 7.2 | 27.6 |
| Outlet | -309 | -4800 | 82.3 | 27.6 |
The pitot loss of air inlet volute is 306Pa, meets design requirement.
Claims (1)
1. a gas turbine inlet air Design of device analytical approach is characterized in that, comprises the steps:
Step 1: set up model;
At first, carry out the primary design two dimension view, under the situation of having confirmed each spot size of two dimension view, the ANSYS three-dimensional modeling is carried out at the position that needs calculate and analyze;
Carry out the finite element division of analytic target according to the concrete technical requirement of analytic target, the accuracy requirement that needs to analyze and calculate, make computing machine can utilize enough resources that each unit is analyzed and calculated;
Step 2: load analysis;
Steps A: intensity and linear buckling analysis;
To the system support analysis, use beam element and shell unit to set up computation model, result of calculation comprises stress distribution, Displacements Distribution and load factor;
Step B: flow field analysis;
The static pressure of analytic system, stagnation pressure and speed streamline, and draw velocity distribution plan, static pressure cloud atlas and the stagnation pressure cloud atlas of typical section respectively.
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| CN102914548A (en) * | 2012-08-27 | 2013-02-06 | 沈阳黎明航空发动机(集团)有限责任公司 | Linear display fault improvement method for nondestructive inspection of ribbed plate of shell |
| CN103020365A (en) * | 2012-12-19 | 2013-04-03 | 中国航空工业集团公司沈阳空气动力研究所 | Active flow control calculation method for serpentine air inlet channel |
| CN105298548A (en) * | 2015-11-20 | 2016-02-03 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for designing turbine impeller of micro gas turbine |
| CN107577867A (en) * | 2017-09-01 | 2018-01-12 | 郑州云海信息技术有限公司 | A kind of analysis method of hard-disk cartridge flow resistance performance |
| CN108304678A (en) * | 2018-03-06 | 2018-07-20 | 中国船舶重工集团公司第七0三研究所 | The method for being directed to different fuel calculation gas turbine performance based on emulation platform |
| CN109255148A (en) * | 2018-07-27 | 2019-01-22 | 石家庄创天电子科技有限公司 | Mechanics product design method and its system |
| CN111475935A (en) * | 2020-03-28 | 2020-07-31 | 中国人民解放军火箭军工程大学 | Damage assessment method for high-temperature high-speed airflow erosion concrete material |
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| CN102914548A (en) * | 2012-08-27 | 2013-02-06 | 沈阳黎明航空发动机(集团)有限责任公司 | Linear display fault improvement method for nondestructive inspection of ribbed plate of shell |
| CN103020365A (en) * | 2012-12-19 | 2013-04-03 | 中国航空工业集团公司沈阳空气动力研究所 | Active flow control calculation method for serpentine air inlet channel |
| CN103020365B (en) * | 2012-12-19 | 2015-11-18 | 中国航空工业集团公司沈阳空气动力研究所 | Active flow control calculation method for serpentine air inlet channel |
| CN105298548A (en) * | 2015-11-20 | 2016-02-03 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for designing turbine impeller of micro gas turbine |
| CN107577867A (en) * | 2017-09-01 | 2018-01-12 | 郑州云海信息技术有限公司 | A kind of analysis method of hard-disk cartridge flow resistance performance |
| CN107577867B (en) * | 2017-09-01 | 2021-04-02 | 郑州云海信息技术有限公司 | Analysis method for flow resistance performance of hard disk cartridge |
| CN108304678A (en) * | 2018-03-06 | 2018-07-20 | 中国船舶重工集团公司第七0三研究所 | The method for being directed to different fuel calculation gas turbine performance based on emulation platform |
| CN109255148A (en) * | 2018-07-27 | 2019-01-22 | 石家庄创天电子科技有限公司 | Mechanics product design method and its system |
| CN109255148B (en) * | 2018-07-27 | 2023-01-31 | 石家庄创天电子科技有限公司 | Mechanical product design method and system |
| CN111475935A (en) * | 2020-03-28 | 2020-07-31 | 中国人民解放军火箭军工程大学 | Damage assessment method for high-temperature high-speed airflow erosion concrete material |
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Application publication date: 20120229 |