CN101140210A - Turbine blade erosion tester - Google Patents
Turbine blade erosion tester Download PDFInfo
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- CN101140210A CN101140210A CNA2007100188307A CN200710018830A CN101140210A CN 101140210 A CN101140210 A CN 101140210A CN A2007100188307 A CNA2007100188307 A CN A2007100188307A CN 200710018830 A CN200710018830 A CN 200710018830A CN 101140210 A CN101140210 A CN 101140210A
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Abstract
The invention relates to a turbine blade water erosion test device which simulates the blade water erosion caused by the high-speed impact of water drip in a low-pressure cylinder of the turbine through the impact between the high-speed rotating blade and the water drip. A DC motor is used as a prime motor, and the rotary speed is improved through a gear speeder to drive a turntable provided with a test blade to rotate; a vibrator drives a nozzle connected with the water drip to produce the water drip, and the water drip axially moves to impact with a test piece; in addition, the system has also a vacuum-pumping system and a drainage system in order to ensure the normal operation of the test. The test device can study the change relations of deformation action and crack growth condition of the turbine blade materials with various factors under the high-speed impact of liquid drip, and provides the basic test data for deeply knowing the impact mechanism of high-speed liquid and solid and the water erosion protection of the turbine blade.
Description
Technical field
The present invention relates to a kind of material erosion tester, be specifically related to a kind of turbine blade erosion tester.
Background technology
Modern large steam turbine import all is the superheated vapor of High Temperature High Pressure, because the vapor expansion acting, has become wet steam to low pressure (LP) cylinder (especially through-flow end what).Wet steam pressure and the density of this moment are all very little, and the mass percent of water is about 5-15%.Because the large steam turbine mass rate is big, the vapor volume flow of low pressure blade level group is very big, therefore needs longer blade so that bigger flow area to be provided.900MW last stage vane of steam turbine diameter has reached 4.2m, and its tip speed is 660m/s, the erosion that blade so at a high speed and the droplet collision in the wet steam will cause blade.Along with further developing of overcritical large steam turbine and high-power nuclear steam turbine, will develop longer exhaust stage blade, cause the peripheral speed of blade tip increasing, the erosion problem that the collision of blade and water droplet causes will be on the rise.Therefore, research water erosion problem also is liquid-solid bump problem, and crucial meaning is arranged.
The blade metal material is subjected to will producing following five kinds of effects after the drop high-speed impact: (1) peripheral surface crackle; (2) subsurface stratum plastic flow and breaking; (3) surface plastic deformation; (4) detrusion of impingement region periphery; (5) crackle that forms owing to stress wave reflection and interaction.There have been some documents to carry out correlative study at present abroad, but do not provided the definite quantitative relation.Because the present situation of liquid-solid high-speed impact the complex nature of the problem and basic theory wants the liquid-solid bump of accurately predicting to also have many problems to need to solve for the damage of metal material.
Summary of the invention
The object of the present invention is to provide a kind ofly can obtain the deformational behavior, crack propagation situation of drop high-speed impact tubine blade material variation relation, for the mechanism of deeply being familiar with the liquid-solid bump of high speed, and further provide the turbine blade erosion tester of quantitative data for the turbine blade erosion protection by test with various factors.
For achieving the above object, the technical solution used in the present invention is: comprise DC MOTOR CONTROL cabinet and the direct current generator that is connected with the DC MOTOR CONTROL cabinet, the output terminal of direct current generator links to each other with gear speeder by shaft coupling, gear speeder drives the rotor rotation by another shaft coupling again, rotor is supported by two rolling bearings, on rotor, be set with an airtight cylinder body, be provided with the wheel disc of fixedlying connected in the cylinder body with rotor, test specimen is housed on the wheel disc, in cylinder body, also be provided with the nozzle that is connected with feed pump, this nozzle is corresponding with the position of test specimen, and in cylinder body, also be provided with the Vib. that is connected with nozzle, cylinder body also is connected with the vacuum pump of bleeding, and is provided with unwatering pump in the lower end of cylinder body, and in the main shaft end of wheel disc the photoelectric encoder that is connected with the DC MOTOR CONTROL cabinet is installed also.
The cutting oil station is installed on the gear speeder of the present invention; Cylinder body and bleed and also be provided with the Motorized vacuum valve between the vacuum pump; Be disposed with reduction valve and vacuum valve between feed pump and the nozzle; Be disposed with vacuum valve and non-return valve between cylinder body and the unwatering pump; Material for test is the turbine blade material, and its width is the thin plate of 4cm, height 10cm, the symmetrical up and down outer rim that is installed on wheel disc of test specimen; The pressure of cylinder body is 0.05bar; Shaft coupling adopts flexible coupling.
The present invention is by the blade of high speed rotating and the collision between the water droplet is simulated because the water erosion that water droplet high-speed impact turbine low pressure cylinder blade is produced in the wet steam, and the speed by the rotation of control blade and the time of operation are controlled relative impact velocity and the collision frequency between blade and the water droplet; The drop diameter that produces by control is simulated in the low pressure stage wet steam drop size to the influence of blade erosion; Observe its influence by the material and the surface appearance that change blade to the collision result.Thereby obtain the deformational behavior, crack propagation situation of drop high-speed impact tubine blade material variation relation, for the turbine blade erosion protection provides quantitative data with various factors.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and principle of work are described in further detail.
Referring to Fig. 1, comprise DC MOTOR CONTROL cabinet 1 and the direct current generator 2 that is connected with DC MOTOR CONTROL cabinet 1, direct current generator 2 is as the rotating speed of prime mover by DC MOTOR CONTROL cabinet 1 control direct current generator 2, start-stop, the output terminal of direct current generator 2 links to each other with gear speeder 4 by flexible coupling 3, cutting oil station 5 is installed on the gear speeder 4, gear speeder 4 drives rotor 21 rotations by another flexible coupling 20 again, rotor 21 is by 6 supportings of two rolling bearings, on rotor 21, be set with an airtight cylinder body 7, be provided with the wheel disc 8 of fixedlying connected in the cylinder body 7 with rotor 21, wheel disc about in the of 8 outer rim be symmetrically installed with test specimen 9, test specimen 9 is 4cm for width, it highly is the thin plate of 10cm, in cylinder body 7, also be provided with the nozzle 11 that is connected with feed pump 14, be disposed with reduction valve 13 and vacuum valve 12 between feed pump 14 and the nozzle 11, this nozzle 11 is corresponding with the position of test specimen 9, and in cylinder body 7, also be provided with the Vib. 10 that is connected with nozzle 11, Vib. 10 drives nozzle 11 double vibrationses, cylinder body 7 also is connected with the vacuum pump 19 of bleeding by Motorized vacuum valve 18, be provided with unwatering pump 17 in the lower end of cylinder body 7, be disposed with vacuum valve 15 and non-return valve 16 between cylinder body 7 and the unwatering pump 17, and the photoelectric encoder 22 that is connected with DC MOTOR CONTROL cabinet 1 also be installed in the main shaft end of wheel disc 8.
Test specimen 9 will be used distilled water flushing then with the grease on sherwood oil wash clean surface before the experiment, with cotton paper water is blotted at last.When doing experiment, the Motorized vacuum valve 15 that will cut out reduction valve 13, vacuum valve 12 and unwatering pump 17 fronts of feed pump 14 fronts earlier opens the Motorized vacuum valve 18 of vacuum pump 19 fronts of bleeding, and starts the 19 pairs of cylinder bodies 7 of vacuum pump of bleeding then and vacuumizes.Reach the certain vacuum degree, when absolute pressure is the 0.05bar left and right sides, the Motorized vacuum valve 18 of vacuum pump 19 fronts of bleeding cuts out, the vacuum pump 19 of bleeding is out of service.Start direct current generator 2 by DC MOTOR CONTROL cabinet 1 then, direct current generator 2 drives wheel disc 8 rotations by gear speeder 4, and the rotating speed of direct current generator 2 is accurately controlled by DC MOTOR CONTROL cabinet 1.Open feed pump 14, reduction valve 13, vacuum valve 12 and Vib. 10 successively when wheel disc 8 arrives desired speed, experiment begins to carry out.When cylinder body 7 bottom water levels when a certain amount of, the Motorized vacuum valve 15 of unwatering pump 17 and front thereof is opened and is put into operation.When cylinder body 7 bottom water levels are low to moderate when a certain amount of, the Motorized vacuum valve 15 of unwatering pump 17 and front thereof cuts out.When cylinder body 7 internal pressures were elevated to certain numerical value, the Motorized vacuum valve 18 of bleed vacuum pump 19 and front thereof was opened and is put into operation.When cylinder body 7 internal pressures were reduced to 0.05bar again, the Motorized vacuum valve 18 of bleed vacuum pump 19 and front thereof cut out.
Carry out in the process in experiment, can stop at any time and take off test specimen 9, observe the form and the development of surface breakdown with microscope.Can wait by change drop diameter, water droplet composition, wheel disc 8 rotational speeies, working time, test specimen 9 surface smoothnesses, test specimen 9 material surface shot peening strengthenings, coating, skin hardness and observe the influence that it destroys blade material.
The present invention installs photoelectric encoder 22 at the main shaft place of wheel disc 8, and detected velocity information is fed back to DC MOTOR CONTROL cabinet 1, makes DC MOTOR CONTROL cabinet 1 can accurately control rotating speed, and control accuracy can reach 1/1000.Because the rotating speed of direct current generator 2 is generally not high, therefore the direct current generator rated speed 3000rpm that the present invention selects for use needs a gear speeder 4 that the rotating speed of axle is improved.Gear speeder 4 speed ratios are decided to be 3, and the maximum speed of wheel disc 8 can reach 9000 rev/mins.The rotating ratio of gear speeder 4 is higher, needs a lubricating oil station 5 lubricated cooling gear speeders 4.The speed of mainshaft of wheel disc 8 is than higher, and rolling bearing 6 all adopts high-speed bearing.Test specimen 9 center radius are 0.7m, thereby test specimen 9 center rotational line speed are 660m/s, can reach the maximum relative velocity of water droplet and blade bump in most of large steam turbine.Cylinder body 7 will vacuumize when doing experiment, and pressure maintains about 0.05bar.The reason that vacuumizes has two.One is because if do not vacuumize, during wheel disc 8 rotation and the friction of air will exhaust very big power of motor.As the next radius of atmospheric pressure is that the power of motor that 0.5 meter disk consumes when rotating speed is 8000 rev/mins will reach 95KW; And when being evacuated down to 0.05bar, a power of motor offer 5KW who needs is just much of that, can reduce the power of required direct current generator 2 greatly, has also strengthened security.The another one reason is exactly to reduce because the blasting action that rotation caused of wheel disc 8 and test specimen 9 makes the movement locus of water droplet more stable experiment normally to be carried out.The saturation pressure of water vapour is 0.03bar in the time of 25 ℃, so stop to vacuumize when selecting cylinder body 7 internal pressures for 0.05bar, makes the water by nozzle 11 exits still be the unsaturation state, vacuumizes by the vacuum pump 19 of bleeding and finishes.After reaching 0.05bar, Motorized vacuum valve 18 cuts out automatically to keep cylinder interior pressure.The generation of water droplet at first will have water system, is finished by a miniwatt feed pump 14.The effect of feed pump 14 front reduction valve 13 is that to keep line pressure constant; And the effect of the vacuum valve 12 of reduction valve 13 fronts is when vacuumizing supply channel to be closed.End at pipeline is a nozzle 11, is actually a syringe needle.Vib. 10 drives the syringe needle up-down vibration with certain frequency, produces the water droplet of certain diameter.Change the internal diameter of syringe needle, just can obtain the water droplet of different sizes.The drop diameter of Chan Shenging is approximately the twice of syringe needle internal diameter in theory, the concrete actual relation curve that also must obtain a drop diameter and syringe needle internal diameter by experiment.Just can calculate test specimen 9 from the space distribution of generation water droplet and whenever rotate a circle and can collide with several water droplets, the space distribution of water droplet is obtained by high speed camera.Carrying out along with experiment, friction between wheel disc 8 and the air can make the temperature of wheel disc 8 raise, the partial pressure of water vapour is increased, the pressure of gas raises in the cylinder body, the Motorized vacuum valve 18 of vacuum pump 19 and front thereof of bleeding this moment is automatically opened operation in succession, takes the higher gas of the temperature of new generation away and keeps that cylinder body 7 internal pressures are constant to be 0.05bar.Along with constantly entering of water droplet, some water droplet also can be beaten on wheel disc 8, gives wheel disc 8 with cooling.Along with constantly entering of water droplet, the water that needs a unwatering pump 17 will accumulate in cylinder body 7 bottoms is taken away.When cylinder body 7 bottom water reached a certain amount of, the Motorized vacuum valve 15 of unwatering pump 17 and front thereof also was to move in succession automatically.The effect of non-return valve 16 is to prevent that aqueous reflux is gone in the cylinder body 7 when unwatering pump 17 shuts down.
Can simulate erosion between turbine low pressure cylinder exhaust stage blade and the water droplet, the destructive process on research material surface by the present invention in the experiment; By the angular velocity of change rotor rotation and the time of operation, can obtain the situation of change of distortion of materials destruction along with stroke speed, bump number of times; Can obtain of the influence of drop diameter size by changing the drop diameter size that produces to blade erosion; Observe its influence by the material and the surface appearance (as the roughness size) that change blade to the knockout process and the situation of destruction; Can in water droplet, add salt and assign to study the influence of chemical reaction knockout process.
Claims (8)
1. turbine blade erosion experimental provision, it is characterized in that: comprise DC MOTOR CONTROL cabinet (1) and the direct current generator (2) that is connected with DC MOTOR CONTROL cabinet (1), the output terminal of direct current generator (2) links to each other with gear speeder (4) by shaft coupling (3), gear speeder (4) drives rotor (21) rotation by another shaft coupling (20) again, rotor (21) is supported by two rolling bearings (6), on rotor (21), be set with an airtight cylinder body (7), be provided with the wheel disc (8) of fixedlying connected in the cylinder body (7) with rotor (21), test specimen (9) is housed on the wheel disc (8), in cylinder body (7), also be provided with the nozzle (11) that is connected with feed pump (14), this nozzle (11) is corresponding with the position of test specimen (9), and in cylinder body (7), also be provided with the Vib. (10) that is connected with nozzle (11), cylinder body (7) also is connected with the vacuum pump of bleeding (19), be provided with unwatering pump (17) in the lower end of cylinder body (7), and the photoelectric encoder (22) that is connected with DC MOTOR CONTROL cabinet (1) also be installed in the main shaft end of wheel disc (8).
2. turbine blade erosion experimental provision according to claim 1 is characterized in that: cutting oil station (5) is installed on the said gear speeder (4).
3. turbine blade erosion experimental provision according to claim 1 is characterized in that: also be provided with Motorized vacuum valve (18) between said cylinder body (7) and the vacuum pump of bleeding (19).
4. turbine blade erosion experimental provision according to claim 1 is characterized in that: be disposed with reduction valve (13) and vacuum valve (12) between said feed pump (14) and the nozzle (11).
5. turbine blade erosion experimental provision according to claim 1 is characterized in that: be disposed with vacuum valve (15) and non-return valve (16) between said cylinder body (7) and the unwatering pump (17).
6. turbine blade erosion experimental provision according to claim 1 is characterized in that: said test specimen (9) material is the turbine blade material, and its width is the thin plate of 4cm, height 10cm, and test specimen (9) symmetry up and down is installed on the outer rim of wheel disc (8).
7. turbine blade erosion experimental provision according to claim 1 is characterized in that: the pressure of said cylinder body (7) is 0.05bar.
8. turbine blade erosion experimental provision according to claim 1 is characterized in that: flexible coupling is all adopted in said shaft coupling (3) and (20).
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710018830A CN100575917C (en) | 2007-10-09 | 2007-10-09 | Turbine blade erosion tester |
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| CN200710018830A CN100575917C (en) | 2007-10-09 | 2007-10-09 | Turbine blade erosion tester |
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| CN101140210A true CN101140210A (en) | 2008-03-12 |
| CN100575917C CN100575917C (en) | 2009-12-30 |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116723A (en) * | 2011-02-21 | 2011-07-06 | 北京工业大学 | Experimental device for researching cavitation resistance of coating |
| CN102252927A (en) * | 2011-03-24 | 2011-11-23 | 西安交通大学 | Water erosion experimental facility with/under rotary impact of high-pressure water jet |
| CN102621057A (en) * | 2012-03-30 | 2012-08-01 | 上海交通大学 | Method and device for testing water erosion resistance of material |
| CN103940729A (en) * | 2014-05-06 | 2014-07-23 | 上海发电设备成套设计研究院 | Liquid impact test piece capable of generating jet leading edge and test method |
| CN105041679A (en) * | 2015-09-08 | 2015-11-11 | 盛瑞传动股份有限公司 | Test bed for water pump |
| CN105259099A (en) * | 2015-10-26 | 2016-01-20 | 东南大学 | Superspeed water lubrication bearing cavitation erosion testing device |
| CN105372142A (en) * | 2015-12-15 | 2016-03-02 | 济南益华摩擦学测试技术有限公司 | High-temperature vacuum fretting corrosion-wear test bed |
| CN105675424A (en) * | 2016-03-04 | 2016-06-15 | 西安交通大学 | Water erosion testing, measuring and controlling system |
| CN106370543A (en) * | 2016-11-04 | 2017-02-01 | 维新制漆（深圳）有限公司 | Testing device for simulating influence of environment on locomotive appearance performance |
| CN106932268A (en) * | 2017-02-21 | 2017-07-07 | 西安交通大学 | Sample based on water erosion pilot system is fixed and arrangement |
| CN104502214B (en) * | 2014-12-23 | 2017-08-15 | 西安交通大学 | Turbine blade material and strengthened coat Anti-erosion and corrosive nature pilot system |
| CN109030260A (en) * | 2018-06-06 | 2018-12-18 | 西安交通大学 | A kind of embedded wheeling disk structure based on water erosion pilot system |
| CN110160946A (en) * | 2019-05-24 | 2019-08-23 | 国网浙江省电力有限公司电力科学研究院 | A kind of depth peak regulation turbine blade erosion test system and its test method |
| CN110926988A (en) * | 2019-11-27 | 2020-03-27 | 西安交通大学 | Method for testing and evaluating water erosion resistance of turbine blade material |
| CN111022132A (en) * | 2019-11-29 | 2020-04-17 | 西安交通大学 | Device for generating high-speed cutoff jet flow by rotating disc with holes |
| CN112903240A (en) * | 2021-01-14 | 2021-06-04 | 太原理工大学 | Visual observation device for excitation induced cavitation |
| CN113267416A (en) * | 2021-04-22 | 2021-08-17 | 福建福清核电有限公司 | Dynamic water erosion experiment platform for turbine blade of nuclear power plant and use method |
-
2007
- 2007-10-09 CN CN200710018830A patent/CN100575917C/en active Active
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116723A (en) * | 2011-02-21 | 2011-07-06 | 北京工业大学 | Experimental device for researching cavitation resistance of coating |
| CN102252927A (en) * | 2011-03-24 | 2011-11-23 | 西安交通大学 | Water erosion experimental facility with/under rotary impact of high-pressure water jet |
| CN102621057A (en) * | 2012-03-30 | 2012-08-01 | 上海交通大学 | Method and device for testing water erosion resistance of material |
| CN103940729A (en) * | 2014-05-06 | 2014-07-23 | 上海发电设备成套设计研究院 | Liquid impact test piece capable of generating jet leading edge and test method |
| CN104502214B (en) * | 2014-12-23 | 2017-08-15 | 西安交通大学 | Turbine blade material and strengthened coat Anti-erosion and corrosive nature pilot system |
| CN105041679A (en) * | 2015-09-08 | 2015-11-11 | 盛瑞传动股份有限公司 | Test bed for water pump |
| CN105259099A (en) * | 2015-10-26 | 2016-01-20 | 东南大学 | Superspeed water lubrication bearing cavitation erosion testing device |
| CN105372142A (en) * | 2015-12-15 | 2016-03-02 | 济南益华摩擦学测试技术有限公司 | High-temperature vacuum fretting corrosion-wear test bed |
| CN105372142B (en) * | 2015-12-15 | 2017-12-08 | 中国科学院近代物理研究所 | A kind of high-temperature vacuum inching corrosion wear test platform |
| CN105675424B (en) * | 2016-03-04 | 2018-04-17 | 西安交通大学 | A kind of water erosion experiment and TT＆C system |
| CN105675424A (en) * | 2016-03-04 | 2016-06-15 | 西安交通大学 | Water erosion testing, measuring and controlling system |
| CN106370543B (en) * | 2016-11-04 | 2023-09-08 | 维新制漆（江西）有限公司 | Testing device capable of simulating influence of environment on locomotive external performance |
| CN106370543A (en) * | 2016-11-04 | 2017-02-01 | 维新制漆（深圳）有限公司 | Testing device for simulating influence of environment on locomotive appearance performance |
| CN106932268A (en) * | 2017-02-21 | 2017-07-07 | 西安交通大学 | Sample based on water erosion pilot system is fixed and arrangement |
| CN109030260A (en) * | 2018-06-06 | 2018-12-18 | 西安交通大学 | A kind of embedded wheeling disk structure based on water erosion pilot system |
| CN109030260B (en) * | 2018-06-06 | 2020-03-17 | 西安交通大学 | Embedded wheel disc structure based on water erosion test system |
| CN110160946A (en) * | 2019-05-24 | 2019-08-23 | 国网浙江省电力有限公司电力科学研究院 | A kind of depth peak regulation turbine blade erosion test system and its test method |
| CN110926988A (en) * | 2019-11-27 | 2020-03-27 | 西安交通大学 | Method for testing and evaluating water erosion resistance of turbine blade material |
| CN111022132A (en) * | 2019-11-29 | 2020-04-17 | 西安交通大学 | Device for generating high-speed cutoff jet flow by rotating disc with holes |
| CN112903240A (en) * | 2021-01-14 | 2021-06-04 | 太原理工大学 | Visual observation device for excitation induced cavitation |
| CN113267416A (en) * | 2021-04-22 | 2021-08-17 | 福建福清核电有限公司 | Dynamic water erosion experiment platform for turbine blade of nuclear power plant and use method |
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| Publication number | Publication date |
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| CN100575917C (en) | 2009-12-30 |
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Assignee: Zhejiang Huayuan Turbine Machinery Co., Ltd. Assignor: Xi'an Jiaotong University Contract record no.: 2011330000605 Denomination of invention: Turbine blade erosion tester Granted publication date: 20091230 License type: Exclusive License Open date: 20080312 Record date: 20110526 |