CN110773501A - Device and method for removing blocking holes of thermal barrier coating of turbine blade by pulsating porous water jet - Google Patents
Device and method for removing blocking holes of thermal barrier coating of turbine blade by pulsating porous water jet Download PDFInfo
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- CN110773501A CN110773501A CN201911211000.5A CN201911211000A CN110773501A CN 110773501 A CN110773501 A CN 110773501A CN 201911211000 A CN201911211000 A CN 201911211000A CN 110773501 A CN110773501 A CN 110773501A
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- blade
- pressure
- turbine blade
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- hole
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
- F01D5/186—Film cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
- B08B2203/02—Details of machines or methods for cleaning by the force of jets or sprays
Abstract
A device and a method for removing the blocking holes of the thermal barrier coating of a turbine blade by using pulsating porous water jet. The device comprises a water tank, an infusion pump, a supercharger, a voltage stabilizer, a pulse generator, a pressure sensor, a computer, a blade root clamp and a blade top clamp. The turbine blade is clamped on the blade root clamp, a liquid inlet in the blade root clamp corresponds to the blade root air inlet cavities of the turbine blade one by one, and the blade top clamp seals the airflow holes at the blade tops of the turbine blades. The pressure is gradually increased from 0 and the sine pulse is presented by controlling the supercharger, the voltage stabilizer and the pulse generator to generate high-pressure pulse water flow. High-pressure pulsating water flow enters a cooling channel of the turbine blade through a liquid inlet and then enters air film holes of a blade basin and a blade back, and through hole processing is realized on a thermal barrier coating hole plugging material. The method has the advantages of simple process, high efficiency, safety and environmental protection, does not damage the thermal barrier coating part outside the air film hole, and provides a solution for the problem of hole blockage of the turbine blade with the thermal barrier coating.
Description
Technical Field
The invention belongs to the technology of coating thermal barrier coatings on turbine blades of aero-engines, in particular to a technology for removing blocking coatings in radiating holes of aero-engines blades, and particularly relates to a device and a method for removing blocking holes of thermal barrier coatings of turbine blades by pulsating porous water jets.
Background
Increasing turbine inlet temperature is an important means of increasing and increasing the thrust and thrust-to-weight ratio of an aircraft engine. On the premise that the high temperature resistance of a metal material is limited, the turbine blade cooling technology becomes a feasible and efficient way for improving the inlet air temperature of the turbine and ensuring the reliable work of the turbine in a high-temperature environment. The effect of a single cooling mode is limited, and the composite cooling in multiple modes is widely applied at present. Thermal barrier coating combines the air film cooling to be one of the effective cooling methods that generally adopt on present turbine blade, and the thermal barrier coating on blade surface can be effectual keeps apart blade and high temperature gas, and the cooling gas of blowout can form the cold air film on high temperature parts surface from the air film hole simultaneously, plays thermal-insulated, cooling and radiating effect, and this kind of compound cooling technology has improved turbine blade high temperature resistance greatly, has promoted the performance of engine.
In the process of manufacturing the turbine blade with the thermal barrier coating and the air film hole, two technical schemes of firstly coating and then manufacturing the hole and firstly manufacturing the hole and then coating exist. When the technical scheme of coating first and then drilling is adopted, the electric spark and electric hydraulic beam machining method cannot be applied to the drilling procedure because the thermal barrier coating is made of non-conductive ceramic materials. When the technical scheme of 'firstly making holes and then coating' is adopted, generally, an electric spark machining method is adopted to machine the air film holes on the metal parts, and then the thermal barrier coating is coated on the surface of the blade, so that the coating material is inevitably deposited on the inner surface of the air film holes, the phenomenon that all or part of the holes of the air film holes are blocked by the thermal barrier coating material is caused, and the subsequent air film holes are required to be dredged. In the prior art, the invention patent with application number CN201610237705 proposes a method of spraying after blocking a hole with a T-shaped shutter; the invention patent with application number CN201611073601 proposes a method for manually dredging blocked air film holes one by using a grinding needle. Because of the large number of film holes, the efficiency of vias using these methods is low and not suitable for mass production. This patent utilizes porous pulsating water jet to carry out through-hole processing simultaneously to all the air film holes on the turbine blade after having coated the thermal barrier coating, and processing technology is simple, high-efficient, safe environmental protection, is applicable to batch production.
Disclosure of Invention
The invention aims to solve the problems of low speed and low efficiency of clearing away thermal barrier coating plugs in the existing turbine blade air film holes of aero-engines, designs a device for removing the thermal barrier coating plugs of the turbine blades by pulsating porous water jet, and simultaneously provides a corresponding method.
One of the technical schemes of the invention is as follows:
a device for removing hole blockage caused by thermal barrier coatings of turbine blades by pulsating porous water jet comprises an infusion pump, a working liquid tank, a pipeline, a supercharger, a voltage stabilizer, a pulsation generator, a pressure sensor, a computer, a blade root clamp and a blade top clamp. The infusion pump is connected with the working fluid tank, the booster is connected with the infusion pump, and the voltage stabilizer is connected to a pipeline between the booster and the pulse generator. The pulsation generator is connected with the blade root clamp, and the pressure sensor is arranged on a pipeline between the blade root clamp and the pulsation generator. And the computer is respectively connected with the supercharger, the pulsation generator, the voltage stabilizer and the pressure sensor. The blade root of the turbine blade is clamped and fixed on the blade root clamp, a plurality of liquid inlets are formed in the blade root clamp, and each liquid inlet and the air inlet cavity in the turbine blade are clamped and sealed in a one-to-one correspondence mode. The blade top of the turbine blade is fixed through the blade top clamp, and the airflow hole of the blade top of the turbine blade is quickly plugged through plugging of the blade top clamp. The blade root clamp and the blade top clamp are both arranged on the workbench.
When the device works, liquid in the working liquid tank is pressed into the supercharger for pressurization by the infusion pump, then enters the voltage stabilizer for pressure stabilization, and then is output to the pulse generator, the pulse generator controls the pulse frequency and the amplitude of the high-pressure liquid, and the output high-pressure pulsed liquid respectively enters the blade cooling channel from the blade root air inlet cavity through the liquid inlet in the blade root clamp. Because the airflow hole at the blade top of the turbine blade is blocked by the blocking block on the blade top clamp, the high-pressure pulsating water flow entering the blade cooling channel can only pass through the blade basin and the air film hole at the blade back of the blade. For the air film hole without the hole blocking phenomenon, high-pressure pulsating water flow is directly ejected from the air film hole; for the air film hole with hole blocking phenomenon, the hole blocking material is removed under the dual action of jet impact force and pulsating pressure formed by high-pressure pulse water jet. Meanwhile, the coating outside the air film hole cannot be damaged.
When the device works, the computer reads the pressure value of the liquid in the pipeline through the pressure sensor, the liquid generates sine-wave pulsating pressure which is gradually increased from 0 by controlling the supercharger, the voltage stabilizer and the pulsation launcher, and the upper limit value of the pressure, the pulsating frequency and the amplitude are obtained through experiments according to different blade models.
The second technical scheme of the invention is as follows:
a method for removing the blocking hole of thermal barrier coating of turbine blade by pulsating porous water jet comprises the following steps:
1. mounting the turbine blade with the hole plugging phenomenon on a blade root clamp; and clamping and sealing the liquid inlet of the blade root clamp and the blade root air inlet cavities in a one-to-one correspondence manner.
2. And adjusting a blade top clamp, fixing the blade top of the turbine blade through a plugging block, and plugging the airflow hole of the blade top.
3. And starting the infusion pump to deliver the working fluid to the pipeline.
4. The pressure of the liquid injected into the blade root air inlet chamber is gradually increased from 0 and presents sinusoidal pulsation by controlling the supercharger, the voltage stabilizer and the pulsation generator through the computer. Upper limit value of pressure (P)
max) The blade model number is obtained through experiments according to different blade models.
5. The computer reads the pressure value in the pipeline through the pressure sensor, and when the pressure reaches P
maxAnd then, stopping pressurizing, keeping the pressure and the pulsation state of the pipeline for a period of time, and continuously processing the through hole, wherein the specific time is determined through tests according to different blade models and hole plugging conditions.
6. Stopping the work of the infusion pump, the supercharger and the pulse generator, and taking out the processed turbine blade. And returning to the first step again, and processing the through hole of the next turbine blade.
The invention has the beneficial effects that:
1. the booster, the voltage stabilizer and the pulsation generator are controlled to enable liquid to generate high-pressure pulsating water pressure, high-pressure pulsating water flow is injected into a cooling channel of the turbine blade and then is ejected out through the air film hole, and the disposable integral dredging of the air film hole in the turbine blade is achieved. The device's clamping, dismantlement are convenient, can carry out disposable air film hole mediation, have greatly improved the mediation efficiency in air film hole.
2. Aiming at the turbine blades of different models, the through hole processing of the air film hole can be realized on the device only by replacing the corresponding blade root clamp and the corresponding blade top clamp, and the cost is reduced.
3. Tap water is adopted for supplying liquid, and the process is simple, safe and environment-friendly.
Drawings
FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention.
FIG. 2 is a schematic view of high pressure pulsating liquid injection into turbine blade cooling channels and porous jet formation.
FIG. 3 is a schematic diagram of a pulsating water jet to remove plugging of a thermal barrier coating material.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The first embodiment.
As shown in figures 1, 2 and 3.
A device for solving the problem of hole blocking of thermal barrier coatings of turbine blades by utilizing pulsating porous water jets comprises a water tank 2, an infusion pump 1, a pressure stabilizer 5, a supercharger 4, a pulsation generator 6, a pressure sensor 11, a blade root clamp 10, a blade top clamp 8, a blocking block 8.1, a clamp seat and a computer 7 which are sequentially arranged, wherein the blade root clamp 10, the blade top clamp 8, the blocking block 8.1 and the clamp seat can be designed and manufactured by self, and can also be directly used by adopting a clamp for machining for proper improvement. As shown in fig. 1, transfer pump 1 link to each other with water tank 2, booster 4 link to each other with transfer pump 1, stabiliser 5 link to each other with booster 4 and impulse generator 6, affiliated impulse generator 6 links to each other with blade root anchor clamps 10, pressure sensor 11 connect in the pipeline between impulse generator 6 and blade root anchor clamps 10, computer 7 link to each other with booster 4, stabiliser 5, impulse generator 6 and pressure sensor 11 respectively, plugging block 8.1 install on blade top anchor clamps 8, blade top anchor clamps 8 link to each other with the anchor clamps seat through the slide rail, blade root anchor clamps 10 fix on the anchor clamps seat. The clamp seat is arranged on the workbench. The computer related to the invention is a conventional computer, and the installed control software can be compiled by related technicians without creative labor and can be directly customized from the market if necessary.
Further, the liquid inlets 10.1 in the blade root fixture and the blade root air inlet chambers 9.2 are correspondingly installed and fixed one by one, as shown in fig. 2. The computer 7 reads the pressure of the liquid inlet through the pressure sensor 11 and controls the pressurizing device 4 and the pulsation generating device 6 to generate water flow with pressure gradually increasing from zero and presenting sinusoidal pulsation.
Example two.
As shown in figures 1, 2 and 3.
A method for solving the problem of hole blocking of a thermal barrier coating of a turbine blade by utilizing pulsating porous water jet is characterized in that the turbine blade is made of high-temperature alloy, the thermal barrier coating is made of ceramic, a blade root clamp and a blade top clamp are both made of stainless steel, and a blocking block 8.1 is made of rubber.
The aperture of the turbine blade air film hole in the embodiment is 0.3-0.5 mm;
in the embodiment, the processing time is obtained through experiments according to different blade models and hole plugging conditions; upper limit value of pressure (P)
max) The method is obtained through experiments according to different blade models;
the position relations of the turbine blade root air inlet chamber, the liquid inlet in the blade root clamp, the blade top clamp plugging block and the blade top clamp in the embodiment are shown in FIG. 2;
the method comprises the following specific steps:
1. installing a blade root clamp on a clamp seat, and installing a blade top clamp on the clamp seat through a sliding rail;
2. the turbine blade to be processed is installed on the blade root fixture, and the liquid inlet in the blade root fixture and the blade root air inlet cavities are installed in a one-to-one correspondence mode.
3. Moving the blade top clamp forwards, fixing the blade top of the turbine blade through a blocking block, and blocking an airflow hole of the blade top;
4. opening the infusion pump and conveying working fluid to the pipeline;
5. the pressurization device and the pulse generation device are controlled by the computer, so that the pressure of the liquid injected into the blade root air inlet chamber is gradually increased from 0, and the sine pulse is presented. Upper limit value of pressure (P)
max) The method is obtained through experiments according to different blade models;
6. the computer reads the pressure of the liquid inlet through the pressure sensor, and when the pressure of the pipeline reaches P
maxAnd then, stopping pressurizing, keeping the pipeline pressure and the pulse state for a period of time, and continuing to process the through hole, wherein the specific time is determined through tests according to different blade models and hole plugging conditions.
7. Stopping the work of the infusion pump, the booster pump and the pulse generator, taking out the processed turbine blade, returning to the first step again, and processing the through hole of the next turbine blade.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, which is intended to be covered by the claims of the present invention.
The present invention is not concerned with parts which are the same as or can be implemented using prior art techniques.
Claims (4)
1. A device for removing the blocking hole of the thermal barrier coating of the turbine blade by pulsating porous water jet is characterized in that: the turbine blade assembly comprises a blade root clamp (10) and a blade top clamp (8), wherein a turbine blade (9) is arranged on the blade root clamp (10) through a blade root (9.3); the blade root clamp (10) is provided with a plurality of liquid inlets (10.1), and each liquid inlet corresponds to one blade root air inlet chamber (9.2); the blade top (9.5) of the turbine blade (9) is fixed through a blade top clamp (8), and an airflow hole of the blade top is blocked by a blocking block (8.1) of the blade top clamp (8); the liquid inlet (10.1) is sequentially connected with a pulse generator (6), a voltage stabilizer (5), a supercharger (4), an infusion pump (1) and a working liquid box (2) through a pipeline (3); a pressure sensor (11) is arranged on the pipeline.
2. The apparatus of claim 1, wherein: the working liquid adopts tap water, the tap water in the working liquid tank (2) is pressed into the supercharger (4) by the infusion pump (1) for supercharging, then is input into the voltage stabilizer (5) for voltage stabilization, then is subjected to pulse frequency control on high-pressure water flow by the pulse generator (6), and the generated high-pressure pulse water flow is injected into the internal cooling channel of the turbine blade from the blade root air inlet cavity (9.2) through the liquid inlet (10.1) and then is ejected from the air film cooling holes (9.1) on the blade basin and the blade back.
3. The apparatus of claim 2, wherein: the computer (7) is respectively connected with the pressure sensor (11), the pulsation generator (6), the supercharger (4) and the voltage stabilizer (5), and the computer (7) collects pressure signals of the pressure sensor (11) in real time and controls the supercharger (4), the voltage stabilizer (5) and the pulsation generator (6) to work according to a preset pulsation pressurization mode.
4. A method for removing the thermal barrier coating of a turbine blade and blocking holes by pulsating porous water jet is characterized by comprising the following steps:
firstly, mounting a turbine blade (9) with a hole plugging phenomenon on a blade root clamp (10); installing and sealing a liquid inlet (10.1) in the blade root clamp (10) and a blade root air inlet chamber in a one-to-one correspondence manner;
a second part, adjusting a blade top clamp (8), fixing the blade top (9.5) of the turbine blade (9) through a blocking block (8.1), and blocking an airflow hole of the blade top;
the third step: starting the infusion pump (1) and delivering working fluid to the pipeline (3);
a fourth step of: the computer (7) is used for controlling the supercharger (4), the voltage stabilizer (5) and the pulse generator (6) to ensure that the pressure of the liquid injected into the blade root air inlet chamber (9.2) is gradually increased from 0 and presents sinusoidal pulse; upper limit of pressure (
P max ) The pulse frequency and the pulse amplitude are obtained through experiments according to different blade models; because the airflow holes on the top of the blade are blocked, high-pressure pulsating water flow entering a cooling channel inside the turbine blade (9) is ejected from the air film hole (9.1) to form a porous pulsating water jet (9.4), and the high-pressure pulsating water jet (9.4) flushes and removes the hole blocking part (9.7) of the thermal barrier coating;
the fifth step: the pressure of the pipeline reaches
P max And then, stopping pressurizing, keeping the pressure and the pulsation state of the pipeline for a period of time, and continuously processing the through hole, wherein the processing time is determined through experiments according to different blade models.
And a sixth step: the infusion pump (1), the supercharger (5) and the pulse generator (6) stop working, and the processed turbine blade is taken out. And returning to the first step again, and processing the through hole of the next turbine blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911211000.5A CN110773501A (en) | 2019-12-02 | 2019-12-02 | Device and method for removing blocking holes of thermal barrier coating of turbine blade by pulsating porous water jet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911211000.5A CN110773501A (en) | 2019-12-02 | 2019-12-02 | Device and method for removing blocking holes of thermal barrier coating of turbine blade by pulsating porous water jet |
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| CN110773501A true CN110773501A (en) | 2020-02-11 |
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| CN201911211000.5A Pending CN110773501A (en) | 2019-12-02 | 2019-12-02 | Device and method for removing blocking holes of thermal barrier coating of turbine blade by pulsating porous water jet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112091672A (en) * | 2020-09-17 | 2020-12-18 | 中国航发航空科技股份有限公司 | Frock clamp for hollow blade processing preventing penetration of excess material |
| CN115161578A (en) * | 2022-07-26 | 2022-10-11 | 大连理工大学 | Thermal barrier coating spraying method for turbine blade with air film hole |
-
2019
- 2019-12-02 CN CN201911211000.5A patent/CN110773501A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112091672A (en) * | 2020-09-17 | 2020-12-18 | 中国航发航空科技股份有限公司 | Frock clamp for hollow blade processing preventing penetration of excess material |
| CN115161578A (en) * | 2022-07-26 | 2022-10-11 | 大连理工大学 | Thermal barrier coating spraying method for turbine blade with air film hole |
| CN115161578B (en) * | 2022-07-26 | 2023-09-19 | 大连理工大学 | Thermal barrier coating spraying method for blade with air film Kong Guolun |
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