CN108507864B - The acquisition methods of test specimen examination section wall thickness direction temperature gradient in a kind of TGMF test - Google Patents
The acquisition methods of test specimen examination section wall thickness direction temperature gradient in a kind of TGMF test Download PDFInfo
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- CN108507864B CN108507864B CN201810330251.4A CN201810330251A CN108507864B CN 108507864 B CN108507864 B CN 108507864B CN 201810330251 A CN201810330251 A CN 201810330251A CN 108507864 B CN108507864 B CN 108507864B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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Abstract
The present invention relates to the acquisition methods of test specimen examination section wall thickness direction temperature gradient in a kind of TGMF test, realize that steps are as follows: (1) completing hollow circular-tube test specimen and upper fixture assembles, upper fixture collet is clamped on fatigue tester；(2) pressure, the drying compressed air of constant mass flow are provided, and are passed through upper fixture gas nozzle by air compressor, pneumatic triple piece, mass flow controller；(3) the different vortex shape load coil of two the number of turns is made, by adjusting coil turn and radius size, guarantees that test specimen examines section outside wall surface uniform temperature fields, while measuring the outside wall surface temperature of test specimen examination section using thermocouple；(4) under zero stress state, carry out temperature cycles, thermocouple and Pitot tube are goed deep into test specimen by airflow channel below test specimen to examine at intersegmental part import and export, gas flow temperature, stagnation pressure and the static pressure at import and export are measured respectively, (5) fluid and structural simulation is carried out using finite element software, obtains examination section wall thickness direction temperature gradient.
Description
Technical field
The present invention relates to the acquisition methods of test specimen examination section wall thickness direction temperature gradient in a kind of TGMF test, TGMF tests
(i.e. temperature gradient thermal mechanical fatigue test) can be used for studying flowing inside hollow cooled turbine blade, heat transfer process to heat engine
The influence of tool fatigue damage belongs to material at high temperature mechanical property test and aerospace technical field of engines.
Background technique
Thermal mechanical fatigue is the dominant failure mode of hollow cooled turbine blade, with traditional low-cycle fatigue, creep with
And the failure modes such as creep-fatigue are compared, thermal mechanical fatigue more can accurately portray fatigue, creep, oxidation equivalent damage factor
Coupling to turbo blade.With the continuous improvement of aero-engine performance, turbine inlet temperature is higher and higher, turbine rotor
Blade generallys use the hollow thin-wall structure with complicated inner cavity, film cooling holes, turbulence columns and cooling floor, blade interior
With complicated flowing, heat transfer process, leading to turbine rotor blade wall thickness direction, there are apparent temperature gradients.Currently, heat engine
The research of tool fatigue and cyclic micromechanism of damage fails to consider temperature gradient usually just for without carrying out under conditions of obvious temperature gradient
The influence damaged to thermal mechanical fatigue is acted on, causes hollow cooled turbine blade life prediction precision low, it is difficult to which satisfaction is first seted out
Motivation develops demand.Therefore, the Experimental Investigation on Thermal-mechanical Fatigue, temperature gradient of development material strips temperature gradient are to thermomechanical
The influence of fatigue life has a very important significance.
Beijing Institute of Aeronautics Wang Rongqiao, Jing Fulei etc. realize turbo blade thermal mechanical fatigue pilot system
(CN201110460131.4), it is passed through compressed air in blade interior during test, the inside in simulation blade examination section is cold
But situation.But test examines section just for blade, it is preferred that emphasis is mechanical load and temperature during simulating examination section is on active service
Loaded-up condition and the examination to blade are spent, the acquisition of the wall thickness direction temperature gradient in piece examination section is not related to.
Northwestern Polytechnical University's high mountain Mount Everest etc. carried out with temperature gradient monotonic tension (Hou Naixian, Yue Zhufeng, Yu Qingmin,
The test and theoretical research [J] material engineering of equal Investigation on Tension Behavior of Thin-walled Cylindrical Specimen at Temperature Gradient, 2008 (3): 36-
39.), low-cycle fatigue (Hou N X, Yu Q M, Wen Z X, et al.Low cycle fatigue behavior of
single crystal superalloy with temperature gradient[J].European Journal of
Mechanics/A Solids, 2010,29 (4): 611-618.) experimental study.High temperature stove heating is used in its research process, to the greatest extent
Uniform temperature field, temperature accuracy with higher can be reached in furnace body by managing this heating method, and can be good at protecting
Demonstrate,prove round tube test specimen outside wall surface temperature, be accordingly used in temperature gradient isothermal test (such as monotonic tension, creep, high temperature low circulation,
Creep-fatigue etc.) there is good effect.However the heating speed of high temperature furnace is slower, is unable to satisfy thermal mechanical fatigue, temperature ladder
Degree thermal mechanical fatigue tests the demand being rapidly heated, and high-temperature furnace body is enclosed construction, it is difficult to pressure cooling is carried out to test specimen,
It is not suitable for the fast-changing thermal mechanical fatigue of temperature, the test of temperature gradient thermal mechanical fatigue thus.
Beijing Institute of Aeronautics Wang Rongqiao, Jiang Kanghe etc. propose a kind of measurement method of hollow pole test specimen inner wall temperature
(CN201510670082.5), it is inserted into inside hollow circular-tube test specimen by the way that the spring leaf of thermocouple will be welded with, and by its both ends
It is fixed on the boss at specimen holder end, so that thermocouple and hollow circular-tube test specimen inner wall are in close contact, realizes in test specimen
The measurement of wall temperature.Since cooling air-flow can gradually be added when the hollow circular-tube test specimen for flowing through heated condition examines intersegmental part
Heat, therefore its heat convection ability gradually reduces, even if being examined in section under the conditions of guaranteeing that examination section hull-skin temperature is uniform
Temperature of the surface from air flow inlet to air stream outlet is also to be stepped up, and conventional thermocouple thermometric can only determine the temperature of certain point
Degree can not accurately reflect the temperature of entire examination section inner surface.
A kind of rotation air film cooled temperature gradient thermal mechanical fatigue examination of the disclosure of the invention such as Northwestern Polytechnical University Wen Zhixun
Check system (CN201710036918.5) guarantees to bear uniaxial draw while test specimen rotation again by improving existing test apparatus
Load is stretched, the difficult point of simulation test piece temperature gradient field experimental enviroment is preferably solved.But on temp measuring method, thermocouple is still used
Measure test specimen inner wall temperature.Since in the test of temperature gradient thermal mechanical fatigue, cooling air-flow is in the open circles for flowing through heated condition
Pipe test specimen can be progressively heated in the process when examining intersegmental part, therefore its heat convection ability gradually reduces, even if guaranteeing outside examination section
Under the conditions of surface temperature is uniform, examining temperature of the section inner surface from air flow inlet to air stream outlet is also to be stepped up, and is passed
System thermocouple temperature measurement can only determine the temperature of certain point, can not accurately reflect the temperature of entire examination section inner surface.
Utilize multipath high-energy energy beam to structure according to setting track and output in patent of invention CN201210051835.0
Power heating and formation temperature gradient fields.But with high costs, complex process need to purchase special test apparatus, and special messenger is to test
Process is monitored, and poor to temperature-controllable, and accurate desired effect is not achieved in temperature field, is not easy to test measurement.
Bernd Baufeld etc. realizes the test of temperature gradient thermal mechanical fatigue by the way of quartz lamp radiant heating
(Baufeld B,Bartsch M,Heinzelmann M.Advanced thermal gradient mechanical
fatigue testing of CMSX-4with an oxidation protection coating[J]
.International Journal of Fatigue,2008,30(2):219-225.).Quartz lamp radiant heating is to utilize stone
English fluorescent tube irradiates test specimen, realizes the heating method of test specimen heating.Radiation furnace heating efficiency is higher, can be in 15s by test specimen
Surface temperature rises to 1000 DEG C from room temperature.Due to needing light-illuminating in surface of test piece when heating, thus it is difficult to that extensometer is installed
Equal strain measurements equipment, and irradiation light heating usually requires to synchronize feedback control to more fluorescent tubes, to the soft of control system
Hardware requirement is higher；Simultaneously as built in quartz lamp, temperature be easy to cause quartz lamp to be damaged, higher cost；Also,
Very good solution is not yet received in the temperature uniformity of examination section, limits it in the application in material at high temperature fatigue test field.
In conclusion the heating speed due to high temperature furnace is slower, and it is enclosed construction, it is difficult to be forced to test specimen
It is cooling, it is not suitable for the fast-changing thermal mechanical fatigue test of temperature；And the heating of multipath high-energy energy beam and quartz lamp radiation add
Heat, higher cost, complex process limit its scope of application；And electromagnetic induction heating has that heating efficiency is strong, heating speed
Fastly, and there is inexpensive advantage.Therefore, it is usually adopted in thermal mechanical fatigue test and the test of temperature gradient thermal mechanical fatigue
Use electromagnetic induction heating.In the test of temperature gradient thermal mechanical fatigue, since cooling air-flow is in the open circles for flowing through heated condition
Pipe test specimen can be progressively heated in the process when examining intersegmental part, therefore its heat convection ability gradually reduces, and will affect after logical cooling air-flow
To the temperature uniformity of test specimen outer surface, shows as temperature of the examination section outer surface from air flow inlet to air stream outlet and gradually rise
It is high；On the other hand, even if examining section inner surface from air flow inlet to gas under the conditions of guaranteeing that examination section hull-skin temperature is uniform
The temperature of outflux is also to be stepped up, and conventional thermocouple thermometric can only determine the temperature of certain point, can not be accurately reflected entire
The temperature of section inner surface is examined, and hollow circular-tube test specimen inner surface also can not be using means such as infrared measurement of temperature.Therefore, in existing skill
On the basis of art condition, it is difficult to guarantee hollow circular-tube test specimen examination section outside wall surface temperature field in the test of temperature gradient thermal mechanical fatigue
Uniformity, it is also difficult to it is accurate to obtain examination section wall thickness direction temperature gradient.
Summary of the invention
Technical problem solved by the present invention is providing test specimen examination section wall thickness direction temperature gradient in a kind of TGMF test
Acquisition methods, hollow circular-tube test specimen examination section outside wall surface is difficult to uniformly add during overcoming the test of temperature gradient thermal mechanical fatigue
Heat, examination section inner surface thermometric are difficult, entirely examination section internal surface temperature situation is difficult to the problem accurately reflected, realize to sky
Heart round tube test specimen examination section outside wall surface is evenly heated, and in the accurate gas flow temperature obtained at examination section import and export, stagnation pressure and quiet
In the case where pressure, fluid and structural simulation is carried out in conjunction with finite element software, examination section wall thickness direction temperature gradient is obtained, for studying
Influence of the temperature gradient to material thermal mechanical fatigue performance.
The technical solution of the invention is as follows: the acquisition of test specimen examination section wall thickness direction temperature gradient in a kind of TGMF test
Method realizes that steps are as follows:
(1) it completes hollow circular-tube test specimen and upper fixture assembles, upper fixture is clamped on fatigue tester；
(2) by air compressor, pneumatic triple piece, mass flow controller collaboration provide the status of criterion under pressure and
The compressed air of constant mass flow, and the air is passed through upper fixture gas nozzle；
(3) two independent load coils are made, by adjusting the coil turn and radius size, are guaranteed hollow
Round tube test specimen examines the outside wall surface uniform temperature fields of section, while obtaining the outer of hollow circular-tube test specimen examination section using thermocouple measurement
Wall surface temperature；
(4) under zero stress state, temperature cycles are carried out, thermocouple and Pitot tube are passed through into gas below hollow circular-tube test specimen
Circulation road, go deep into hollow circular-tube test specimen examination intersegmental part airflow inlet at and air flow outlet, measure the examination section respectively
At internal airflow inlet and gas flow temperature, stagnation pressure and the static pressure of air flow outlet, imported and exported obtaining the examination intersegmental part
After the gas flow temperature and pressure at place, lower fixture assembly is carried out；
(5) with the outside wall surface temperature of the hollow circular-tube test specimen examination section of step (3), the hollow circular-tube test specimen of step (4) is examined
The gas flow temperature and pressure of core intersegmental part import and export carry out fluid and structural simulation as input condition, by finite element software,
Obtain examination section wall thickness direction temperature gradient.
In the step (1), upper fixture is made of the collet with airflow channel, switching, gas nozzle.By upper fixture installation process
Are as follows: hollow circular-tube test specimen and collet with airflow channel are screwed in into switching respectively, and adjusts screw-in depth and guarantees hollow circular-tube examination
The collet tip contact of part and upper fixture, the collet of upper fixture is clamped on fatigue tester, and gas nozzle is screwed in collet.
In the step (2), air compressor, pneumatic triple piece, mass flow controller collaboration are provided under the status of criterion
Pressure and constant mass flow drying compressed air process are as follows: air compressor generates continuous but pressure, flow not
Then stable air-flow is filtered to air-flow, dries and is decompressed to constant pressure by pneumatic triple piece, after last pressure stabilizing
Air-flow stability of flow is realized after mass flow controller.
In the step (3), described two independent load coils are concentric during installation, and close to compressed air into
The coil turn of mouth is more.In TGMF test, since cooling air-flow is in the hollow circular-tube test specimen examination section for flowing through heated condition
It can be progressively heated in the process when portion, therefore its heat convection ability gradually reduces；When using traditional isometrical coil heats, it can guarantee to lead to
The uniformity of hollow circular-tube test specimen examination section hull-skin temperature before cooling air-flow, but lead to the temperature of test specimen outer surface after cooling air-flow
Degree uniformity can be destroyed, and shown as temperature of the examination section outer surface from air flow inlet to air stream outlet and be stepped up.Pass through
Increase hollow circular-tube test specimen examination section inlet load coil the number of turns, reduce load coil diameter, so that open circles
Pipe test specimen examines the enhancing of section inlet coil heats ability, and balance cooling air-flow is gradually dropped from examination section entrance to the outlet of examination section
Low heat convection ability, to guarantee the uniformity in test specimen examination section outside wall surface temperature field.
Described two independent load coils are two vortex shape load coils, close to compressed air inlet
Coil turn is 3 circles, and is 2 circles close to the coil turn of compressed air outlet.
In the step (4), lower fixture assembling process are as follows: switching is screwed in into hollow circular-tube test specimen first, it then will be with gas
The collet of circulation road screws in switching, and the screw-in depth by adjusting switching and collet guarantees hollow circular-tube test specimen and lower fixture
Collet tip contact, gas nozzle is finally screwed in into collet.
Biggest advantage is the present invention compared with prior art: in the test of temperature gradient thermal mechanical fatigue, due to cold
But air-flow can be progressively heated in the process when the hollow circular-tube test specimen for flowing through heated condition examines intersegmental part, therefore its heat convection ability
It gradually reduces, the temperature uniformity of test specimen outer surface is influenced whether after logical cooling air-flow, show as examination section outer surface from gas
The temperature of inflow entrance to air stream outlet is stepped up, the present invention by adjusting vortex shape load coil the number of turns and size,
So that examination section inlet coil heats ability enhancing, to guarantee the uniformity in test specimen examination section outside wall surface temperature field；It is another
Aspect, even if examining section inner surface from air flow inlet to air stream outlet under the conditions of guaranteeing that examination section hull-skin temperature is uniform
Temperature be also to be stepped up, conventional thermocouple thermometric can only determine the temperature of certain point, can not accurately reflect entire examination section
The temperature of inner surface, and round tube test specimen inner surface also can not obtain examination section accurate using the means such as infrared measurement of temperature, the present invention
In the case where import and export gas flow temperature, stagnation pressure and static pressure, in conjunction with the fluid and structural simulation of finite element software, examination section wall is obtained
Thick direction temperature gradient overcomes and section inner surface thermometric difficulty, entire examination section internal surface temperature situation is examined to be difficult to accurately instead
The problem reflected.
Detailed description of the invention
Fig. 1 is the acquisition methods flow chart that test specimen examines section wall thickness direction temperature gradient in a kind of TGMF test of the present invention；
Fig. 2 is hollow circular-tube test specimen schematic diagram；
Fig. 3 is the collet figure with airflow channel, wherein (a) is collet schematic diagram, (b) is collet front view, (c) is collet
Top view (d) is collet bottom view, (e) is collet left view；
Fig. 4 is switching figure, wherein (a) is switching schematic top plan view, is (b) switching elevational schematic view, (c) faces for switching
Figure is (d) switching top view, is (e) switching bottom view, is (f) switching left view；
Fig. 5 is gas nozzle figure, wherein (a) is gas nozzle schematic diagram, (b) is gas nozzle front view, is (c) gas nozzle left view, (d) is
Gas nozzle top view；
Fig. 6 is upper fixture installation diagram；
Fig. 7 is vortex shape load coil figure, wherein (a) is vortex shape load coil (3 circle) figure, it (b) is whirlpool
Revolve shape load coil (2 circle) figure；
Fig. 8 is upper fixture and vortex shape load coil installation diagram；
Fig. 9 is Pitot tube schematic diagram, and wherein E is stagnation pressure air inlet, and F is static pressure air inlet, and G is differential manometer, and H goes out for static pressure
Port, I are stagnation pressure gas outlet；
Figure 10 is fixture general assembly drawing；
Figure 11 is examination segment model figure；
Figure 12 is fluid mass and solid area illustraton of model；
Figure 13 is finite element model figure；
Figure 14 is examination section temperature gradient calculated result figure, and wherein O is temperature ladder in wall thickness direction at examination section airflow inlet
Cloud atlas is spent, P is examination section air flow outlet wall thickness direction temperature gradient cloud atlas.
Specific embodiment
As shown in Figure 1, test specimen examines the acquisition methods of section wall thickness direction temperature gradient in a kind of TGMF test of the present invention,
(1) hollow circular-tube test specimen and collet with airflow channel are screwed in into switching respectively, and adjust screw-in depth guarantee it is empty
Heart round tube test specimen and collet tip contact, clamp the cartridge on fatigue tester, and gas nozzle is screwed in collet；
(2) by air compressor, pneumatic triple piece, mass flow controller provide pressure, constant mass flow it is dry
Dry compressed air, and be passed through in gas nozzle；
(3) the different vortex shape load coil of two the number of turns is made, when installation guarantees that two coils are concentric and close
The coil turn of compressed air inlet is more, by adjusting coil turn and radius size, guarantees that test specimen examines section outside wall surface temperature
Field is uniformly；
(4) under zero stress state, temperature cycles are carried out, thermocouple and Pitot tube is deep by airflow channel below test specimen
Enter test specimen examination section entrance and the outlet of examination section, respectively gas flow temperature, the stagnation pressure of measurement examination intersegmental part entrance and exit
And static pressure, after completing the acquisition of examination section inlet and outlet gas flow temperature and pressure, achievable lower fixture assembly, and carry out open circles
The test of pipe test piece temperature gradient thermal mechanical fatigue；
(5) to examine section outside wall surface temperature, the gas flow temperature at inner port and exit and pressure as input condition,
Fluid and structural simulation is carried out using finite element software, obtains examination section wall thickness direction temperature gradient, its step are as follows:
1. establishing hollow circular-tube test specimen examination segment model using Unigraphics NX (UG) or Solidworks software；
2. opening ANSYS WORKBENCH, hollow circular-tube test specimen is imported in GEOMETRY module and examines segment model, it is hollow
Round tube test specimen examines segment model cylindrical portions as solid area, to hollow circular-tube test specimen examination segment model middle section creation envelope
It closes after face, filling as fluid mass, assigns solid area and fluid mass material properties, solid area and fluid mass are distinguished
Hollow circular-tube test specimen and cooling air-flow are referred to, subsequent fluid and structural simulation is used for；
3. completing the grid dividing to solid area and fluid mass in MESH module, trellis-type is set, and is stream
Body region is inserted into fluid boundary layer；
4. to examine section outside wall surface temperature, the gas flow temperature at inner port and exit and pressure as input condition,
Fluid and structural simulation is carried out using FLUENT module, available hollow circular-tube test specimen examination section and inside are cold after the completion of calculating
But the temperature cloud picture of air-flow selects solid area, can check hollow circular-tube test specimen examination section outside wall surface to inner wall along wall
The temperature gradient in thick direction.
Its specific embodiment is as follows；
The first step completes the installation of upper clamp: first respectively trying hollow circular-tube as shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5
Part 2 and collet 3 with airflow channel screw in switching 4, and adjust screw-in depth and guarantee that hollow circular-tube test specimen 2 and 3 top of collet connect
Touching, collet 3 is clamped on fatigue tester, and gas nozzle 5 is screwed in collet 3, assembles situation as shown in fig. 6, wherein 2,3,4,5 points
Hollow circular-tube test specimen, the collet with airflow channel, switching and gas nozzle are not represented.
Then second step provides pressure, mass flow by air compressor, pneumatic triple piece, mass flow controller
Constant drying compressed air, and be passed through in gas nozzle 5.
Third step makes the vortex shape load coil of two the number of turns differences (2 circles and 3 circles) (respectively as in Fig. 7 respectively
(a) and (b) shown in), guarantee that two vortex shape load coils are concentric when installation, and close to the vortex of compressed air inlet
Shape load coil the number of turns is more, assembly situation as shown in figure 8, wherein 2,3,4,5,7 (a), 7 (b), C, D respectively represent it is hollow
Round tube test specimen, the collet with airflow channel, switching, gas nozzle, coil (3 circle), coil (2 circle), test specimen examination section entrance and examination
Section outlet.By adjusting the coil turn and radius size, hollow circular-tube test specimen is enabled to examine section inlet coil heats
Power enhancing, balance cooling air-flow exports the heat convection ability gradually decreased from examination section entrance to examination section, to guarantee to try
The uniformity in part examination section outside wall surface temperature field.
4th step carries out temperature cycles under zero stress state, by thermocouple and Pitot tube (as shown in figure 9, wherein its
Middle E is stagnation pressure air inlet, and F is static pressure air inlet, and G is differential manometer, and H is static pressure gas outlet, and I is stagnation pressure gas outlet) pass through test specimen
Lower section airflow channel gos deep into test specimen examination section entrance C and examination section outlet D, respectively the air-flow temperature at measurement examination section import and export
Degree, stagnation pressure and static pressure, thermocouple and Pitot tube are all off-the-shelf equipments, can directly be read, and import and export air-flow completing examination section
After the acquisition of temperature and pressure, lower fixture assembly can be carried out, such as Fig. 2, Fig. 3, Fig. 4, Fig. 5, process is as follows: will transfer 4 first
Hollow circular-tube test specimen 2 is screwed in, the collet 3 with airflow channel is then screwed in into switching 4, by the screw-in for adjusting switching 4 and collet 3
Depth guarantees hollow circular-tube test specimen 2 and 3 tip contact of collet, and gas nozzle 5 is finally screwed in collet 3.General assembly drawing is as shown in Figure 10,
Wherein 2,3,4,5,7 (a), 7 (b), C, D respectively represent hollow circular-tube test specimen, the collet with airflow channel, switching, gas nozzle, coil
(3 circle), coil (2 circle), test specimen examination section entrance and the outlet of examination section.After completing lower fixture assembly, hollow circular-tube examination can be carried out
The test of part temperature gradient thermal mechanical fatigue.
4th step, to examine section outside wall surface temperature, the gas flow temperature at inner port and exit and pressure is as input
Condition carries out fluid and structural simulation using finite element software, obtains examination section wall thickness direction temperature gradient, its step are as follows:
(1) hollow circular-tube test specimen examination segment model is established using softwares such as Unigraphics NX (UG) or Solidworks
(as shown in figure 11), shape are isometrical cylinder.
(2) ANSYS WORKBENCH is opened, hollow circular-tube test specimen examination segment model is imported in GEOMETRY module (such as
Shown in Figure 11), hollow circular-tube test specimen examines segment model cylindrical portions as solid area, examines segment model to hollow circular-tube test specimen
Middle section is used as fluid mass after creating sealing surface, filling, is used for subsequent fluid and structural simulation, assigns solid area and fluid
Region material attribute, as a result as shown in figure 12, wherein J is solid area, and K is fluid mass.
(3) grid dividing to solid and fluid mass is completed in MESH module, trellis-type is set, and is fluid zone
Fluid boundary layer is inserted into domain, and as a result as shown in figure 13, wherein L, M, N are respectively solid area, fluid mass and fluid boundary
Layer.
(4) to examine section outside wall surface temperature, inner wall entrance and the gas flow temperature in exit and pressure as input item
Part carries out fluid and structural simulation, available hollow circular-tube test specimen examination section and internal cooling air-flow using FLUENT module
Temperature cloud picture, select solid area, can check hollow circular-tube test specimen examination section outside wall surface to inner wall along wall thickness direction
Temperature gradient, calculated result is as shown in figure 14, and wherein O is wall thickness direction temperature gradient cloud atlas at examination section airflow inlet, and P is
Examine section air flow outlet wall thickness direction temperature gradient cloud atlas.
From above-mentioned specific implementation process it can be found that the present invention is by adjusting the number of turns of vortex shape load coil and half
Diameter size, so that examination section inlet coil heats ability enhancing, balance cooling air-flow is from examination section entrance to the outlet of examination section
The heat convection ability gradually decreased, to ensure that the uniformity in test specimen examination section outside wall surface temperature field；Meanwhile it accurately obtaining
In the case where the gas flow temperature, stagnation pressure and the static pressure that take examination section entrance and exit, to examine section outside wall surface temperature, inner wall
The gas flow temperature and pressure in entrance and exit carry out fluid and structural simulation as input condition, in conjunction with finite element software, obtain
To examination section wall thickness direction temperature gradient, examination section inner surface thermometric difficulty, entire examination section internal surface temperature situation are overcome
It is difficult to the problem accurately reflected.
Non-elaborated part of the present invention belongs to techniques well known.
The scope of the present invention is defined by the following claims.It does not depart from spirit and principles of the present invention and makes various etc.
Same substitutions and modifications should all cover within the scope of the present invention.
Claims (6)
1. the acquisition methods of test specimen examination section wall thickness direction temperature gradient in a kind of TGMF test, which is characterized in that including following
Step:
(1) it completes hollow circular-tube test specimen and upper fixture assembles, upper fixture is clamped on fatigue tester；
(2) pressure and quality under the status of criterion are provided by air compressor, pneumatic triple piece, mass flow controller collaboration
The constant compressed air of flow, and the air is passed through upper fixture gas nozzle；
(3) two independent load coils are made, by adjusting the coil turn and radius size, guarantee hollow circular-tube
Test specimen examines the outside wall surface uniform temperature fields of section, while obtaining the outside wall surface of hollow circular-tube test specimen examination section using thermocouple measurement
Temperature；
(4) under zero stress state, temperature cycles are carried out, thermocouple and Pitot tube are led to by air-flow below hollow circular-tube test specimen
Road, go deep into hollow circular-tube test specimen examination intersegmental part airflow inlet at and air flow outlet, measure the examination intersegmental part respectively
Airflow inlet at and air flow outlet gas flow temperature, stagnation pressure and static pressure, obtaining the examination intersegmental part import and export
After gas flow temperature and pressure, lower fixture assembly is carried out；
(5) with the outside wall surface temperature of the hollow circular-tube test specimen examination section of step (3), the hollow circular-tube test specimen of step (4) examines section
The gas flow temperature and pressure of internal import and export carry out fluid and structural simulation as input condition, by finite element software, obtain
Examine section wall thickness direction temperature gradient.
2. the acquisition methods of test specimen examination section wall thickness direction temperature gradient in a kind of TGMF test according to claim 1,
It is characterized by: upper fixture is made of the collet with airflow channel, switching, gas nozzle, and upper fixture was installed in the step (1)
Journey are as follows: hollow circular-tube test specimen and collet with airflow channel are screwed in into switching respectively, and adjusts screw-in depth and guarantees hollow circular-tube
The collet tip contact of test specimen and upper fixture, the collet of upper fixture is clamped on fatigue tester, and gas nozzle is screwed in collet.
3. the acquisition methods of test specimen examination section wall thickness direction temperature gradient in a kind of TGMF test according to claim 1,
It is characterized by: air compressor, pneumatic triple piece, mass flow controller collaboration provide the status of criterion in the step (2)
Under pressure and constant mass flow drying compressed air process are as follows: it is equal that air compressor generates continuous but pressure, flow
Then unstable air-flow is filtered to air-flow, dries and is decompressed to constant pressure, last pressure stabilizing by pneumatic triple piece
Air-flow afterwards realizes stability of flow after mass flow controller.
4. the acquisition methods of test specimen examination section wall thickness direction temperature gradient in a kind of TGMF test according to claim 1,
It is characterized by: described two independent load coils are concentric during installation in the step (3), and empty close to compression
The coil ratio of gas import is more close to the coil turn of compressed air outlet, in TGMF test, since cooling air-flow is flowing
It can be progressively heated in the process when crossing the hollow circular-tube test specimen examination intersegmental part of heated condition, therefore its heat convection ability gradually reduces；
Section inlet load coil the number of turns is examined by increasing hollow circular-tube test specimen, reduces load coil diameter, makes to have leisure
Heart round tube test specimen examine section inlet coil heats ability enhancing, balance cooling air-flow from examination section entrance to examination section outlet by
The heat convection ability gradually reduced, to guarantee the uniformity in test specimen examination section outside wall surface temperature field.
5. the acquisition side of test specimen examination section wall thickness direction temperature gradient in a kind of TGMF test according to claim 1 or 4
Method, it is characterised in that: described two independent load coils are two vortex shape load coils, close to compressed air
The coil turn of import is 3 circles, and is 2 circles close to the coil turn of compressed air outlet.
6. the acquisition methods of test specimen examination section wall thickness direction temperature gradient in a kind of TGMF test according to claim 1,
It is characterized by: in the step (4), lower fixture assembling process are as follows: switching is screwed in into hollow circular-tube test specimen first, then by band
The collet of airflow channel screws in switching, and the screw-in depth by adjusting switching and collet guarantees hollow circular-tube test specimen and lower fixture
Collet tip contact, finally screws in collet for gas nozzle.
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