CN102539135B - Thermal mechanical fatigue test system for hollow air-cooled turbine blade - Google Patents
Thermal mechanical fatigue test system for hollow air-cooled turbine blade Download PDFInfo
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- CN102539135B CN102539135B CN201110460131.4A CN201110460131A CN102539135B CN 102539135 B CN102539135 B CN 102539135B CN 201110460131 A CN201110460131 A CN 201110460131A CN 102539135 B CN102539135 B CN 102539135B
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Abstract
The invention discloses a thermal mechanical fatigue test system for a hollow air-cooled turbine blade, which includes a loading subsystem, a heating subsystem, an air cooling subsystem, a water cooling subsystem and a controlling subsystem, wherein the loading subsystem vertically clamps the turbine blade; the heating subsystem is horizontally placed in the middle part of the loading subsystem for heating the turbine blade; the air cooling subsystem is horizontally arranged and connected with the loading subsystem through a pipeline; the water cooling subsystem is horizontally arranged and connected with the loading subsystem and the heating subsystem through the pipeline; and the controlling subsystem is arranged at the upper part of the heating subsystem and connected with the loading subsystem, the heating subsystem and the air cooling subsystem through a cable. The thermal mechanical fatigue test system is used for simulating the working stress field, the temperature field and the loading spectrum of the examination cross section of the hollow air-cooled turbine blade. The thermal mechanical fatigue test system satisfactorily overcomes the difficulty for simulating the working stress field, the temperature field and the loading spectrum of the examination cross section of the hollow air-cooled turbine blade, and provides the technical basis and the safety guarantee for the safe and reliable working of the aero engine.
Description
(1) technical field
The present invention relates to aero engine turbine blades thermal mechanical fatigue pilot system, particularly relate to a kind of thermal mechanical fatigue test system for hollow air-cooled turbine blade, it is a kind of test unit that can simulate turbo blade examination section stress field, temperature field and loading spectrum, belongs to Aero-Space technical field of engines.
(2) background technology
Thermal mechanical fatigue (TMF) fault of gas-turbine blade is aeromotor one of topmost failure type during one's term of military service, is to affect the engine turbine blade principal element in serviceable life.At present, be mostly similar to test specimen based on standard specimen and blade for the thermal mechanical fatigue test of nickel-base high-temperature single crystal alloy.And actual turbine rotor blade will bear the load such as centrifugal force, aerodynamic force in the course of the work, produce stretching, torsion, flexural deformation, be multi-axis stress state; For the turbo blade with inner chamber, in heating/cooling procedure, the positions such as film cooling holes limit and turbulence columns chamfering can produce larger thermograde, cause significant stress to concentrate, and may cause the germinating of crackle.Above-mentioned feature is that the approximate test specimen of standard specimen and blade is difficult to simulation.And for monocrystal material, the nuance of technological process and sampling, can cause the difference of mechanical property.Therefore the thermal mechanical fatigue test of, carrying out true turbo blade analysis of determining longevity research, blade fault in design and prevent significant for turbo blade.
The turbo blade thermal mechanical fatigue pilot system that Russia Central Institute of Aviation Motors (CIAM) develops requires to use the fatigue tester that stretching and torsional load can be provided, and current general fatigue tester can only provide the tensile load of single shaft; This pilot system does not comprise air cooling subsystem, cannot simulate the cooling procedure of hollow turbine vane.The A714D cooled turbine blade heat/mechanical composite fatigue exerciser of Shenyang engine design Research Institute adopts nylon tension belt that mechanical load is delivered on blade, and adjusts the stress distribution of turbo blade by changing the angle of nylon tape and blade; But nylon is wear-resisting, high temperature resistant, tensile strength is all worse than steel, and the environment temperature of thermal mechanical fatigue test unit mechanical load higher, that bear is larger, test of long duration can cause the problems such as the wearing and tearing of nylon, aging, elongation, causes the loading spectrum control accuracy of this exerciser lower.
(3) summary of the invention
(1) goal of the invention
The invention provides a kind of thermal mechanical fatigue test system for hollow air-cooled turbine blade, it has overcome the deficiencies in the prior art, preferably resolve the difficult point of hollow cooled turbine blade examination working stress field, cross section, temperature field and loading spectrum simulation, guarantee carrying out smoothly of aero engine turbine blades thermal mechanical fatigue test, for the safe and reliable work of aeromotor provides technical foundation and safety guarantee.
(2) technical scheme
A kind of thermal mechanical fatigue test system for hollow air-cooled turbine blade of the present invention, mainly comprise 5 subsystems: load subsystem, the subsystem of heating, air cooling subsystem, water-cooled subsystem and control subsystem, the position annexation between them is: load subsystem in the vertical direction clamping turbo blade; The subsystem of heating is placed horizontally at and loads subsystem middle part, and turbo blade is heated; Air cooling subsystem horizontal positioned, is connected with loading subsystem by pipeline; Water-cooled subsystem horizontal positioned, is connected with the subsystem of heating with loading subsystem by pipeline; Control subsystem is positioned over the subsystem top of heating, and is connected with loading subsystem, the gentle hail system of the subsystem of heating by cable.The present invention can be used for the simulation of hollow cooled turbine blade examination working stress field, cross section, temperature field and loading spectrum.
Described loading subsystem is made up of fatigue tester and turbo blade unit clamp, after turbo blade unit clamp clamping turbo blade, then is placed on the chuck of fatigue tester; It is for providing thermal mechanical fatigue to test required mechanical load.Fatigue tester is that choose in market, and the tensile load of single shaft can be provided.Turbo blade unit clamp is designed, designed processing, and material is heat-resisting alloy mould steel, the surface processing of turning blue.Turbo blade unit clamp is made up of upper fork block, lower fork block, pin (× 4), fork (× 2), the approximate part of the turbine disk, baffle plate (× 2), screw (× 4), hold-down bolt (× 4), blade built-up jig and pad (× 40).Wherein, upper and lower fork block is step shaft-like part, is individually fixed in the upper and lower chuck of fatigue tester; Fork 11,3 is connected with upper and lower fork block by pin 12,2; Fork 11 is connected with blade built-up jig 9 by pin 10; Baffle plate is connected by the approximate part of screw 7 and the turbine disk; The approximate part of the turbine disk is fixed on fork 3 by the pin hole and the pin 4 that arrange on it.This fork is the Y shape part that is provided with through hole on it; The approximate part of this turbine disk is the T shape part that is provided with through hole, blind hole and tongue-and-groove on it; This baffle plate is the rectangular slab materials and parts that are provided with through hole on it; This blade built-up jig is a point half formula step rectangle sheet construction, and is respectively arranged with endoporus, water-cooled hole and vent port: its endoporus matches with the integral shroud of workpiece for measurement turbo blade, and for transmitting mechanical load, hole number is one; Its water-cooled hole is connected with water-cooled subsystem, and for cooled blade built-up jig, hole number is one; Its vent port is for discharging the internal cooling air-flow of turbo blade, and hole number is two.4 hold-down bolts 8 are fixed together two parts of blade built-up jig, see Fig. 3.For the ease of the reliable delivery of mechanical load, for the turbo blade with integral shroud not, need to be at the blade tip position of turbo blade by casting or welding special-shaped integral shroud.The tenon of turbo blade matches with the tongue-and-groove of the approximate part of the turbine disk, for simulating the mounting condition of turbo blade on the turbine disk.The approximate part of the turbine disk, with air cooling passage, is connected with air cooling subsystem; Cooling draught enters into the inner chamber of turbo blade by air cooling passage, carry out the internal cooling of turbo blade.2 baffle plates are fixed on the both sides of the approximate part tongue-and-groove of the turbine disk by 4 screws, prevent from skidding off when turbo blade from bearing mechanical load the leakage of tongue-and-groove and cooling draught.4 pins connect respectively lower fork block 1 and fork 3, fork 3 and the approximate part 5 of the turbine disk, blade built-up jig 9 and fork 11, fork 11 and upper fork block 13.Between two parts that each pin connects, be reserved with gap (thickness × 10 of the size=pad in gap), just can insert 10 pads.The assembly being connected by pin is called joint, and this turbine unit clamp has 4 joints.By changing the combination (changing the number of left and right, gap pad) of each joint pad, can adjust the angle of turbo blade and fatigue tester main shaft, realize the eccentric tension of turbo blade, the tensile load of single shaft is decomposed to the turbo blade of sening as an envoy to and produce component bending, torsional deflection.In conjunction with said method, adjust the tensile load of fatigue tester simultaneously, can realize the simulation of turbo blade examination working stress field, cross section.
The described subsystem of heating is made up of high-frequency induction furnace and load coil, is connected to each other therebetween; It is for providing thermal mechanical fatigue to test required thermal force.High-frequency induction furnace is that choose in market.Load coil is self design, adopts two-tube point of half formula structure, sees Fig. 9, and it is made up of 2 copper pipes, connecting copper piece and plastic water pipes, and the two ends of plastic water pipe are socketed with one end of 2 copper pipes respectively, and connecting copper piece is fixed together 2 copper pipes.2 copper pipes and connecting copper piece form current return; 2 copper pipes and plastic water pipe form chilled(cooling) water return (CWR).Load coil is connected with high-frequency induction furnace, and copper pipe inside is connected with chilled water.By changing the shape of load coil and the distance of load coil and turbine blade surface, can cause different magnetic leakages in different regions, produce required thermograde at turbine blade surface.In conjunction with said method, adjust the power input of high-frequency induction furnace simultaneously, can realize the simulation of turbo blade examination working temperature field, cross section.
Described air cooling subsystem is made up of air compressor, decompression venting valve, air mass flow amount controller and three-way connection, is connected to each other therebetween by pipeline; It is for providing thermal mechanical fatigue to test required cooling draught.Air compressor, decompression venting valve, air mass flow amount controller, pipeline and three-way connection are market and choose.Air compressor provides continuously but pressure, all unsettled air-flows of flow; After decompression venting valve, it is constant that air-flow pressure keeps; After air mass flow amount controller, it is constant that air flow rate keeps.In the exit of air mass flow amount controller, three-way connection is installed.An outlet of three-way connection is connected with the air cooling passage of the approximate part of the turbine disk, for simulating the internal cooling of turbo blade; Another outlet is provided with normally closed solenoid valve, and by control subsystem control, cooling for simulating the external forced of turbo blade.
Described water-cooled subsystem is made up of water pump and water storage tank, is connected to each other therebetween by pipeline; It is cooling for thermal mechanical fatigue process of the test Instrumental equipment.Water pump, pipeline and water storage tank are market and choose.Chilled water in water storage tank is divided into two parts after water pump supercharging: a part enters high-frequency induction furnace, for cooling high-frequency induction furnace and load coil; Another part enters the water-cooled hole of blade built-up jig, for cooled blade built-up jig.Two parts chilled water completes gets back to water storage tank to after instrument and equipment cooling, forms cooling water circulation.
Described control subsystem is made up of load controller, temperature controller and normally closed solenoid valve, is connected to each other therebetween by cable; It tests the synchro control of each subsystem for thermal mechanical fatigue.Load controller is equipped with by fatigue tester, input mechanical load waveform, output mechanical load voltage signal.Mechanical load voltage signal divides two-way: a road is input to fatigue tester, and turbo blade unit clamp is loaded; Another road is input to temperature controller.Temperature controller is designed, designed, and matches with high-frequency induction furnace, input mechanical load voltage signal, and according to the increase of mechanical load voltage signal/reduce, the output ON/OFF signal of high-frequency induction furnace and the pass of normally closed solenoid valve/open signal.Normally closed solenoid valve is that choose in market.
(3) advantage and effect
A kind of thermal mechanical fatigue test system for hollow air-cooled turbine blade of the present invention, compared with prior art, advantage is:
The first, the turbo blade unit clamp that adopts stainless steel to manufacture, can transmit mechanical load reliably; By changing the combination of joint pad, can adjust simply and easily the angle of turbo blade and fatigue tester main shaft, realize the simulation of turbo blade examination working stress field, cross section.
The second, load coil adopts two-tube point of half formula structure, utilizes connecting copper piece and plastic water pipe, and current return and chilled(cooling) water return (CWR) are separated, and can produce complex-shaped load coil, and be convenient to dismounting; The use of connecting copper piece has increased the stability of load coil, and has reduced the contact resistance of copper pipe, has avoided load coil overheated.
The 3rd, adopt decompression venting valve and air mass flow amount controller, can accurately control the cooling gas flow of turbo blade, and in conjunction with the use of three-way connection and normally closed solenoid valve, the variation of the inside and outside cooling draught of turbo blade can simulate aeromotor and stop time.
The 4th, utilize control subsystem by loading, heat and air cooling process has been carried out synchro control, can simulate more accurately the loading spectrum of turbo blade thermal mechanical fatigue test.
(4) accompanying drawing explanation
The loading spectrum schematic diagram of Fig. 1 thermal mechanical fatigue testing requirements
Fig. 2 thermal mechanical fatigue test system architecture block diagram
Fig. 3 turbo blade unit clamp positive two is surveyed view
Fig. 4 integral shroud vertical view
Fig. 5 (a) blade built-up jig front view
Fig. 5 (b) blade built-up jig left view
Fig. 5 (c) blade built-up jig cut-open view
Fig. 6 (a) turbine disk is similar to test specimen front view
Fig. 6 (b) turbine disk is similar to test specimen left view
Fig. 7 (a) pad front view
Fig. 7 (b) pad left view
Fig. 8 (a) left and right, gap pad number is 0-10;
Fig. 8 (b) left and right, gap pad number is 5-5;
Fig. 8 (c) left and right, gap pad number is 10-0
Two-tube point of half formula load coil vertical view of Fig. 9
In figure, symbol description is as follows:
1: lower fork block 16: copper pipe
2: pin 17: copper pipe
3: fork 18: connecting copper piece
4: pin 19: plastic water pipe
5: 1. the turbine disk is similar to part: the endoporus of blade built-up jig 9
6: baffle plate (× 2) 2.: the water-cooled hole of blade built-up jig 9
7: screw 3.: the vent port of blade built-up jig 9
8: hold-down bolt (× 4) 4.: the air cooling passage of the approximate test specimen 5 of the turbine disk
9: blade built-up jig F: mechanical load/kN
10: pin T: temperature/℃
11: fork t: time/s
12: pin O-A: load phase
13: upper fork block A-B: peak value keeps the stage
14: turbo blade B-C: unloading phase
15: pad C-D: valley keeps the stage
(5) embodiment
Below in conjunction with accompanying drawing, a kind of thermal mechanical fatigue test system for hollow air-cooled turbine blade of the present invention is simulated to the technical scheme of taking for realization examination working stress field, cross section, temperature field and loading spectrum and be described further.The loading spectrum of hollow cooled turbine blade thermal mechanical fatigue test as shown in Figure 1, is divided into loading (O-A), peak value maintenance (A-B), unloading (B-C) and valley and keeps (C-D) four-stage.The examination cross section of turbo blade is blade middle section.By Finite Element Method, calculate the working stress field and the temperature field that keep stage turbo blade examination cross section at the peak value of loading spectrum, and the target of stress field and temperature field simulation under using this as test condition.Thermal mechanical fatigue test system for hollow air-cooled turbine blade forms as shown in Figure 2.
(1) simulation of turbo blade examination working stress field, cross section
The simulation of turbo blade examination working stress field, cross section realizes by loading subsystem.Under test condition, the stress field of turbo blade depends on the tensile load of fatigue tester and the angle of turbo blade and fatigue tester main shaft.
The mechanical load of thermal mechanical fatigue test system for hollow air-cooled turbine blade is produced by fatigue tester.Turbo blade unit clamp as shown in Figure 3, is made up of lower fork block 1, pin 2, fork 3, pin 4, the approximate part 5 of the turbine disk, baffle plate 6 (× 2), screw 7 (× 4), hold-down bolt 8 (× 4), blade built-up jig 9, pin 10, fork 11, pin 12, upper fork block 13 and pad 15 (× 40).Wherein, upper fork block 13 and lower fork block 1 are individually fixed in the upper and lower chuck of fatigue tester.For the ease of the reliable delivery of mechanical load, for the turbo blade with integral shroud not, need to or weld special-shaped integral shroud in the casting of the blade tip position of turbo blade, as shown in Figure 4.Blade built-up jig 9 is a point half formula formula step rectangle sheet construction, with endoporus 1., water-cooled hole 2. with vent port 3., as shown in Fig. 5 (a), (b), (c).1. the endoporus of blade built-up jig 9 matches with the integral shroud of turbo blade 14, for transmitting mechanical load; 2. water-cooled hole is connected with water-cooled subsystem, for cooled blade built-up jig 9, prevents that thermal mechanical fatigue process of the test Leaf built-up jig 9 is due to the overheated undercapacity causing; Vent port is 3. for discharging the internal cooling air-flow of turbo blade 14.Hold-down bolt 8 is fixed together two parts of blade built-up jig 9.The tenon of turbo blade 14 matches with the tongue-and-groove of the approximate part 5 (Fig. 6 (a), (b)) of the turbine disk, for simulating the mounting condition of turbo blade on the turbine disk.The approximate part 5 of the turbine disk, with 4. (Fig. 6 (a), (b)) of air cooling passage, is connected with air cooling subsystem; 4. cooling draught enters into the inner chamber of turbo blade 14 by air cooling passage, carry out internal cooling.Baffle plate 6 is fixed on the both sides of approximate part 5 tongue-and-grooves of the turbine disk by screw 7, prevent that turbo blade 14 from skidding off the leakage of tongue-and-groove and cooling draught while bearing mechanical load.
The tensile load that fatigue tester produces, after lower fork block 1, pin 2, fork 3, pin 4, is delivered to the approximate part 5 of the turbine disk; The tongue-and-groove of the approximate part 5 of the turbine disk matches with the tenon of turbo blade 14, and mechanical load is delivered on turbo blade 14; 1. the integral shroud of turbo blade 14 matches with the endoporus of blade built-up jig 9, and mechanical load is continued upwards to transmit; After mechanical load via pins 10, fork 11, pin 12, be passed to fork block 13.
The assembly being connected by pin 2,4,10 and 12 is called joint, and turbo blade unit clamp has four joints: lower fork block 1 and fork 3 that pin 2 connects; The fork 3 that pin 4 connects and the approximate part 5 of the turbine disk; Blade built-up jig 9 and fork 11 that pin 10 connects; Fork 11 and upper fork block 13 that pin 12 connects.Between two parts that each pin connects, be reserved with gap (thickness × 10 of the size=pad in gap), just can insert 10 pads 15, pad 15 is as shown in Fig. 7 (a), (b).By changing the combination of each joint pad 15, (joint that following fork block 1, pin 2 and fork 3 form is example, as shown in Fig. 8 (a), (b), (c), the number of left and right, gap pad 15 is respectively 0-10,5-5,10-0), can adjust the angle of turbo blade 14 and fatigue tester main shaft, realize the eccentric tension of turbo blade 14, the tensile load of single shaft is decomposed to the turbo blade 14 of sening as an envoy to and produce the component of bending, torsional deflection.In conjunction with said method, adjust the tensile load of fatigue tester simultaneously, can realize turbo blade 14 and examine the simulation of working stress field, cross section.
The material of turbo blade unit clamp is 30CrMnSiA, the surface processing of turning blue.Fatigue tester is Css-280 electo hydraulic servocontrolled fatigue testing machine, maximum load ± 100kN, and load controller is equipped with.
(2) simulation of turbo blade examination working temperature field, cross section
Examine the simulation of working temperature field, cross section need to be by the gentle hail system of the subsystem of heating to turbo blade 14.Under test condition, distance, the power input of high-frequency induction furnace and the cooling gas flow of turbo blade 14 on the shape of load coil, load coil and turbo blade 14 surfaces depended in the temperature field of turbo blade 14.Loading and peak value at loading spectrum keep the stage, and turbo blade 14 inside are connected with the cooling draught of 0.1MPa, 8g/s, and amounting to volumetric flow rate is 371SLPM (standard liter/min).
1) the inner colded simulation of turbo blade 14
It is large that hollow cooled turbine blade thermal mechanical fatigue is tested required cooling gas flow, and require pressure, the constant flow of air-flow.Cooling draught is provided by air cooling subsystem.Air cooling subsystem is made up of air compressor, decompression venting valve, air mass flow amount controller and three-way connection, as shown in Figure 2.Air compressor provides continuously but pressure, all unsettled air-flows of flow; Air-flow is after decompression venting valve, and pressure stabilizes to 0.45MPa; Air-flow is after air mass flow amount controller, and stability of flow is 371SLPM.In the exit of air mass flow amount controller, three-way connection is installed.4. an outlet of three-way connection is connected with the air cooling passage of the approximate part 5 of the turbine disk, and another outlet is provided with normally closed solenoid valve.Loading and the peak value maintenance stage, normally closed solenoid valve is closed, cooling draught all through the air cooling passage of the approximate part 5 of the turbine disk 4., tenon bottom by turbo blade 14 enters its inner chamber, and discharge from film cooling holes, blade tip vent port and trailing edge vent port, complete the internal cooling to turbo blade 14.
Air compressor model is TA-125, air capacity 2.0m
3/ min, power 15kW, the highest discharge pressure 0.7MPa; Decompression venting valve model is QTY-25, range of regulation 0.05～0.85MPa, maximum input pressure 1MPa; Air mass flow amount controller model is V10FC-VC, flow control scope 250～500SLPM, maximum withstand voltage 1MPa, operting differential pressure 0.03～0.5MPa, accuracy ± 0.8%.
2) applying of heat fatigue load
Turbo blade thermal mechanical fatigue testing requirements rate temperature change is fast, adopts the mode of high-frequency induction to heat.The thermal force of the hollow air turbine blade of the present invention thermal mechanical fatigue pilot system is provided by high-frequency induction furnace.
The present invention's load coil used adopts two-tube point of half formula structure, formed by copper pipe 16, copper pipe 17, connecting copper piece 18 and plastic water pipe 19, the two ends of plastic water pipe 19 are socketed with one end of copper pipe 16,17 respectively, and connecting copper piece 18 is fixed together copper pipe 16,17; As shown in Figure 9.Copper pipe 16, copper pipe 17 and connecting copper piece 18 form current return; Copper pipe 16, copper pipe 17 and plastic water pipe 19 form chilled(cooling) water return (CWR).Load coil is directly connected with high-frequency induction furnace.By changing the shape of load coil and the distance of load coil and turbo blade 14, can cause different magnetic leakages in different regions, produce required thermograde on the surface of turbo blade 14.In conjunction with said method, adjust the power input of high-frequency induction furnace simultaneously, can realize turbo blade 14 and examine the simulation of working temperature field, cross section.
High-frequency induction furnace model is SPG-30B, power input 5～30kW, and oscillation frequency 50～200kHz, chilled water requires 0.2MPa, 6L/min, and is equipped with temperature controller.
(3) simulation of turbo blade examination cross section loading spectrum
Thermal mechanical fatigue test load spectrum requires turbo blade 14 to examine the stress in cross section and temperature to change simultaneously, need to be to loading, heat and air cooling subsystem carrying out synchro control.The synchro control of each subsystem is completed by control subsystem.
Control subsystem is made up of load controller, temperature controller and normally closed solenoid valve, as shown in Figure 2.Load controller input mechanical load waveform, output mechanical load voltage signal is to fatigue tester and temperature controller.Fatigue tester receives after mechanical load voltage signal, and turbo blade unit clamp is loaded.Temperature controller receives after mechanical load signal, according to the increase of mechanical load voltage signal/reduce, the output ON/OFF signal of high-frequency induction furnace and the pass of normally closed solenoid valve/open signal: in the time that mechanical load voltage signal increases, high-frequency induction furnace is opened, and turbo blade 14 is heated; In the time that mechanical load voltage signal reduces, high-frequency induction furnace is closed, and opens normally closed solenoid valve simultaneously, makes the cooling draught of half directly blow to turbo blade 14 surfaces, and while parking for simulating aeromotor, air is cooling to the external forced of turbo blade 14; In the time that mechanical load voltage signal is constant, the state of high-frequency induction furnace and normally closed solenoid valve remains unchanged.
Load controller is equipped with by Css-280 electo hydraulic servocontrolled fatigue testing machine, output voltage-5V～5V; Temperature controller is designed, designed, and matches with SPG-30B high-frequency induction furnace, input voltage-5V～5V, output double switch signal.
(4) instrument and equipment is cooling
In order to guarantee the normal operation of thermal mechanical fatigue process of the test Instrumental equipment, need to carry out cooling to instrument and equipment.Chilled water is provided by water-cooled subsystem, in order to save water resource, adopts circulating water.
Water-cooled subsystem is made up of water pump and water storage tank, as shown in Figure 2.Chilled water in water storage tank is divided into two parts after water pump supercharging: a part enters high-frequency induction furnace, for cooling high-frequency induction furnace and load coil; The water-cooled hole that another part enters blade built-up jig 9 2., for cooled blade built-up jig 9.Two parts chilled water completes gets back to water storage tank to after instrument and equipment cooling, forms cooling water circulation.In the time that the water temperature of water storage tank reaches 40 ℃, need to change chilled water.
Water storage tank capacity 1.0m
3; Model of pump 1WZB-25-0.37, flow 1.8m
3/ h.
Claims (4)
1. a thermal mechanical fatigue test system for hollow air-cooled turbine blade, is characterized in that: this thermal mechanical fatigue test system for hollow air-cooled turbine blade comprises loading subsystem, the subsystem of heating, air cooling subsystem, water-cooled subsystem and control subsystem; Load subsystem in the vertical direction and clamp hollow cooled turbine blade; The subsystem of heating is placed horizontally at and loads subsystem middle part, and hollow cooled turbine blade is heated; Air cooling subsystem horizontal positioned, is connected with loading subsystem by pipeline; Water-cooled subsystem horizontal positioned, is connected with the subsystem of heating with loading subsystem by pipeline; Control subsystem is positioned over the subsystem top of heating, and is connected with loading subsystem, the gentle hail system of the subsystem of heating by cable; It is for the simulation of hollow cooled turbine blade examination working stress field, cross section, temperature field and loading spectrum;
Described loading subsystem is made up of fatigue tester and hollow cooled turbine blade unit clamp, and hollow cooled turbine blade unit clamp clamps after hollow cooled turbine blade, then is placed on the chuck of fatigue tester; Load subsystem for providing thermal mechanical fatigue to test required mechanical load; Fatigue tester provides the tensile load of single shaft; Hollow cooled turbine blade unit clamp is designed, designed processing, and hollow cooled turbine blade unit clamp is made up of upper fork block, lower fork block, pin, fork, the approximate part of the turbine disk, baffle plate, screw, hold-down bolt, blade built-up jig and pad; Wherein, upper and lower fork block is step shaft-like part, and upper fork block is fixed on the upper grip of fatigue tester, and lower fork block is fixed on the lower chuck of fatigue tester; The first fork by the first pin be connected with lower fork block, the second fork pass through the 4th pin be connected with upper fork block; The second fork is connected with blade built-up jig by the 3rd pin; Baffle plate is connected by the approximate part of screw and the turbine disk; The approximate part of the turbine disk is fixed on the first fork by the pin hole and the second pin that arrange on it; This first and second fork is the Y shape part that is provided with through hole on it; The approximate part of this turbine disk is the T shape part that is provided with through hole, blind hole and tongue-and-groove on it; This baffle plate is the rectangular slab materials and parts that are provided with through hole on it; This blade built-up jig is a point half formula step rectangle sheet construction, and is respectively arranged with endoporus, water-cooled hole and vent port: its endoporus matches with the integral shroud of the hollow cooled turbine blade of workpiece for measurement, for transmitting mechanical load; Its water-cooled hole is connected with water-cooled subsystem, for cooled blade built-up jig; Its vent port is for discharging the internal cooling air-flow of hollow cooled turbine blade; 4 hold-down bolts are fixed together two parts of blade built-up jig, for the ease of the reliable delivery of mechanical load, and for the hollow cooled turbine blade with integral shroud not, need to be at the blade tip position of hollow cooled turbine blade by casting or welding special-shaped integral shroud; The tenon of hollow cooled turbine blade matches with the tongue-and-groove of the approximate part of the turbine disk, the mounting condition for analog space heart cooled turbine blade on the turbine disk; The approximate part of the turbine disk, with air cooling passage, is connected with air cooling subsystem; Cooling draught enters into the inner chamber of hollow cooled turbine blade by air cooling passage, carry out the internal cooling of hollow cooled turbine blade; 2 baffle plates are fixed on the both sides of the approximate part tongue-and-groove of the turbine disk by 4 screws, prevent that hollow cooled turbine blade from skidding off the leakage of tongue-and-groove and cooling draught while bearing mechanical load; The lower fork block of the first pin connection is connected the first fork and is connected blade built-up jig and is connected the second fork and upper fork block with the second fork, the 4th pin with the approximate part of the turbine disk, the 3rd pin with the first fork, the second pin; Between two parts that each pin connects, be reserved with gap and just insert 10 pads; The assembly being connected by pin is called joint, this hollow cooled turbine blade unit clamp has 4 joints, change the number of left and right, gap pad by changing the combination of each joint pad, adjust the angle of hollow cooled turbine blade and fatigue tester main shaft, realize the eccentric tension of hollow cooled turbine blade, the tensile load of single shaft is decomposed to the hollow cooled turbine blade of sening as an envoy to and produce component bending, torsional deflection; Adjust the tensile load of fatigue tester simultaneously, can realize the simulation of hollow cooled turbine blade examination working stress field, cross section;
The described subsystem of heating is made up of high-frequency induction furnace and load coil, is connected to each other therebetween; Heat subsystem for providing thermal mechanical fatigue to test required thermal force; Load coil is self design, adopts two-tube point of half formula structure, and it is made up of 2 copper pipes, connecting copper piece and plastic water pipes, and the two ends of plastic water pipe are socketed with one end of 2 copper pipes respectively, and connecting copper piece is fixed together 2 copper pipes; 2 copper pipes and connecting copper piece form current return; 2 copper pipes and plastic water pipe form chilled(cooling) water return (CWR); Load coil is connected with high-frequency induction furnace, and copper pipe inside is connected with chilled water; By changing the shape of load coil and the distance on load coil and hollow cooled turbine blade surface, cause different magnetic leakages in different regions, produce required thermograde on hollow cooled turbine blade surface; Adjust the power input of high-frequency induction furnace simultaneously, can realize the simulation of hollow cooled turbine blade examination working temperature field, cross section;
Described air cooling subsystem is made up of air compressor, decompression venting valve, air mass flow amount controller and three-way connection, and air compressor is all connected by pipeline with three-way connection with air mass flow amount controller, air mass flow amount controller with decompression venting valve, decompression venting valve; Air cooling subsystem is for providing thermal mechanical fatigue to test required cooling draught; Air compressor provides continuously but pressure, all unsettled air-flows of flow; After decompression venting valve, it is constant that air-flow pressure keeps; After air mass flow amount controller, it is constant that air flow rate keeps; In the exit of air mass flow amount controller, three-way connection is installed, an outlet of three-way connection is connected with the air cooling passage of the approximate part of the turbine disk, for the internal cooling of analog space heart cooled turbine blade; Another outlet is provided with normally closed solenoid valve, and by control subsystem control, cooling for the external forced of analog space heart cooled turbine blade;
Described water-cooled subsystem is made up of water pump and water storage tank, is connected to each other therebetween by pipeline; Water-cooled subsystem is cooling for thermal mechanical fatigue process of the test Instrumental equipment; Chilled water in water storage tank is divided into two parts after water pump supercharging: a part enters high-frequency induction furnace, for cooling high-frequency induction furnace and load coil; Another part enters the water-cooled hole of blade built-up jig, for cooled blade built-up jig; Two parts chilled water completes gets back to water storage tank to after instrument and equipment cooling, forms cooling water circulation;
Described control subsystem is made up of load controller, temperature controller and normally closed solenoid valve, and load controller is all connected by cable with normally closed solenoid valve with temperature controller, temperature controller; Control subsystem is tested the synchro control of each subsystem for thermal mechanical fatigue; Load controller is equipped with by fatigue tester, input mechanical load waveform, output mechanical load voltage signal; Mechanical load voltage signal divides two-way: a road is input to fatigue tester, and hollow cooled turbine blade unit clamp is loaded; Another road is input to temperature controller; Temperature controller is designed, designed, and matches with high-frequency induction furnace, input mechanical load voltage signal, and according to the increase of mechanical load voltage signal/reduce, the output ON/OFF signal of high-frequency induction furnace and the pass of normally closed solenoid valve/open signal.
2. a kind of thermal mechanical fatigue test system for hollow air-cooled turbine blade according to claim 1, is characterized in that: the material of this hollow cooled turbine blade unit clamp is heat-resisting alloy mould steel, the surface processing of turning blue.
3. a kind of thermal mechanical fatigue test system for hollow air-cooled turbine blade according to claim 1, is characterized in that: the quantity of hollow cooled turbine blade unit clamp Intermediate gasket is 40.
4. a kind of thermal mechanical fatigue test system for hollow air-cooled turbine blade according to claim 1, is characterized in that: in this blade built-up jig, the quantity of endoporus, water-cooled hole and vent port is respectively one, one and two.
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