CN113551914A - Carbon deposit prevention structure and method for fuel nozzle test piece - Google Patents
Carbon deposit prevention structure and method for fuel nozzle test piece Download PDFInfo
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- CN113551914A CN113551914A CN202110772572.1A CN202110772572A CN113551914A CN 113551914 A CN113551914 A CN 113551914A CN 202110772572 A CN202110772572 A CN 202110772572A CN 113551914 A CN113551914 A CN 113551914A
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- fuel
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- test piece
- main pipe
- compressed gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
Abstract
The invention discloses a carbon deposition prevention structure and a method for a fuel nozzle test piece, which relate to the technical field of aviation gas turbine engines, and the carbon deposition prevention structure for the fuel nozzle test piece comprises a control module, a control module and a control module, wherein the control module is used for controlling the starting and the stopping of a compressor and an electric heater; the compressor is used for providing compressed gas to blow off residual oil in the fuel nozzle; an electric heater for heating the compressed gas; the check valve prevents fuel from flowing back into the compressor from the fuel manifold; the fuel main pipe is divided into a plurality of branch pipes which are respectively connected with fuel nozzles. The invention provides compressed gas through the compressor to blow off the residual fuel in the fuel main pipe and the fuel nozzle, has simple structure and high blowing-off rate, and can effectively reduce the problem of carbon deposition of the fuel nozzle caused by incomplete residual oil discharge of the fuel main pipe and the fuel nozzle; meanwhile, the electric heater can provide high-temperature compressed gas to blow and melt ice crystals accumulated in the oil way in a low-temperature environment, so that carbon deposition of the fuel nozzle caused by oil way blockage is prevented.
Description
Technical Field
The invention belongs to the technical field of aviation gas turbine engines, and particularly relates to a carbon deposition prevention structure and method for a fuel nozzle test piece.
Background
In the engine bench test, after the engine test piece is stopped, the temperature of the hot end part of the aviation gas turbine engine is still very high and cannot be reduced to the ambient temperature in a short time, at the moment, the fuel oil remained in the fuel oil main pipe and the fuel oil flow passage of the fuel oil nozzle is easy to coke or deposit carbon under the action of the waste heat of the engine, the fuel oil flow passage is slightly reduced, and the nozzle is completely blocked by the deposited carbon due to the heavy condition. At present, after the test run of an engine bench is finished, in order to discharge residual oil in a fuel main pipe and a fuel nozzle flow passage, the common mode is that the residual oil is consistent with that of an aircraft gas turbine engine, an oil discharge valve and related pipelines are additionally arranged in a fuel system, and the residual oil in the fuel main pipe and the fuel nozzle is discharged by means of higher cavity pressure in a combustion chamber casing in a period of time after an engine test piece is stopped.
However, the method of additionally installing the oil discharge valve and the oil return pipeline in the fuel system increases the complexity of the structure of the engine test piece for the bench test vehicle and increases the maintenance cost. Because the pressure in the combustion chamber casing is rapidly reduced to the environmental pressure after the test piece of the aviation gas turbine engine is stopped, especially in the initial stage of engine development, when the technology is incomplete, the technology has certain failure risk, and the technology cannot ensure that residual oil in a fuel oil main pipe and a fuel oil nozzle is completely discharged. Meanwhile, when the engine test piece for bench test run is in a low-temperature environment, ice crystals can be generated in the fuel oil main pipe and the fuel oil nozzle, and fuel oil is remained in the fuel oil main pipe and the fuel oil nozzle.
Therefore, the invention provides a carbon deposit prevention structure and a method for a fuel nozzle test piece, which aim to solve the problems in the background art.
Disclosure of Invention
The invention aims to provide a carbon deposit prevention structure and a carbon deposit prevention method for a fuel nozzle test piece, and aims to solve the problems that the prior technical scheme provided by the background art is additionally provided with an oil discharge valve and an oil return pipeline, the complexity of the engine test piece structure for a bench test car is increased, certain failure risk exists, and the residual oil in a fuel main pipe and a fuel nozzle cannot be completely discharged.
According to one aspect of the invention, the carbon deposition prevention structure for the fuel nozzle test piece comprises a control module, a control module and a control module, wherein the control module is connected with a compressor and used for receiving a stop signal of an engine test piece to control the start and stop of the compressor and an electric heater; the end, far away from the control module, of the compressor is connected with the electric heater and used for providing compressed gas to the fuel manifold to blow off residual oil in the fuel nozzle after the engine test piece stops; the end of the electric heater, which is far away from the compressor, is connected with the one-way valve and is used for heating the compressed gas when the electric heater is started; the one end of the one-way valve, which is far away from the electric heater, is connected with the fuel manifold, so that fuel is prevented from flowing back into the compressor from the fuel manifold when an engine test piece is tested; the fuel oil main pipe is characterized in that one end of the fuel oil main pipe is an oil inlet, the other end of the fuel oil main pipe is connected with a plurality of branch pipes, and the branch pipes are respectively connected with fuel oil nozzles.
According to another aspect of the invention, a carbon deposition prevention method for a fuel nozzle test piece is provided, and comprises the following steps:
s1: after the system of the engine test piece is stopped or when the fuel supply pressure in the fuel main pipe is larger than a set value, the system generates different stop signals and feeds the signals back to the control module;
s2: when the type of the stop signal in the S1 is system stop, the control module receives the stop signal and then controls the compressor to start to generate normal-temperature compressed gas, the compressed gas passes through the one-way valve and then is introduced into the fuel main pipe and shunted to enter the branch pipes, the fuel nozzle is blown, and fuel remained in the fuel main pipe and the fuel nozzle is blown into the combustion chamber quickly;
s3: when the type of the stop signal in the S1 is that the fuel supply pressure in the fuel main pipe is greater than a set value, the control module receives the stop signal and then controls the compressor and the electric heater to start to generate high-temperature compressed gas, the compressed gas passes through the one-way valve and then is introduced into the fuel main pipe and shunted to enter a plurality of branch pipes to blow the fuel nozzle, ice crystals in the fuel main pipe and the fuel nozzle are rapidly melted, and fuel remained in the fuel main pipe and the fuel nozzle is rapidly blown into the combustion chamber;
s4: and the compressor in the S2 is shut down after being started for three minutes, and the compressor and the electric heater in the S3 are shut down after being started for five minutes, so that the carbon deposition prevention process of the whole fuel nozzle test piece is completed.
According to an exemplary embodiment of the invention, the total pressure of compressed gas discharged by said compressor is at least 50% higher than the total pressure of the combustion chamber.
According to another exemplary embodiment of the present invention, the engine test piece employs S3 at room temperature less than-20 ℃.
According to another exemplary embodiment of the present invention, the temperature of the high-temperature compressed gas in S3 is at least 20% higher than room temperature and not more than 150 ℃ at maximum.
Compared with the prior art, the invention has the beneficial effects that:
1. in the parking process of the bench test, the compressor supplies compressed gas to blow off the residual fuel in the fuel main pipe and the fuel nozzle.
2. The invention is provided with the electric heater, can provide high-temperature compressed gas, blows and melts ice crystals accumulated in the oil path when the combustor part simulates high altitude plateau ignition, prevents the oil path from being blocked, and avoids the carbon deposition of the fuel nozzle caused by the residual fuel in the fuel main pipe and the fuel nozzle.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a carbon deposition prevention structure of a fuel nozzle test piece;
FIG. 2 is a flow chart of a carbon deposition prevention method for a fuel nozzle test piece.
In the figure: 1. a control module; 2. a compressor; 3. an electric heater; 4. a one-way valve; 5. a fuel manifold; 501. an oil inlet; 6. and a fuel nozzle.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are further described in detail below by way of examples with reference to the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the invention.
Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.
According to one general technical concept of the present invention, as shown in fig. 1, a carbon deposition prevention structure for a fuel nozzle test piece is provided, which comprises a control module 1, wherein the control module 1 is connected with a compressor 2 and is used for receiving a stop signal of an engine test piece to control the start and stop of the compressor 2 and an electric heater 3; the compressor 2 is connected with the electric heater 3 at one end of the compressor 2, which is far away from the control module 1, and is used for supplying compressed gas to the fuel manifold 5 to blow off residual oil in the fuel nozzle 6 after the engine test piece is stopped; one end of the electric heater 3, which is far away from the compressor 2, is connected with the one-way valve 4 and is used for heating compressed gas during starting; the one end of the one-way valve 4, which is far away from the electric heater 3, is connected with the fuel manifold 5, so that fuel is prevented from flowing back into the compressor 2 from the fuel manifold 5 when an engine test piece is tested; the fuel oil system comprises a fuel oil main pipe 5, wherein one end of the fuel oil main pipe 5 is an oil inlet 501, the other end of the fuel oil main pipe 5 is connected with a plurality of branch pipes, and the branch pipes are respectively connected with fuel oil nozzles 6.
As shown in fig. 2, a carbon deposition prevention method for a fuel nozzle test piece comprises the following steps:
s1: after the system of the engine test piece is stopped or when the fuel supply pressure in the fuel main pipe 5 is larger than a set value, the system generates different stop signals and feeds the signals back to the control module 1;
s2: when the type of the stop signal in the step S1 is system stop, the control module 1 receives the stop signal and then controls the compressor 2 to start, so as to generate normal-temperature compressed gas, the compressed gas passes through the check valve 4 and then is introduced into the fuel main pipe 5 and shunted into the branch pipes, and blows the fuel nozzle 6, so as to rapidly blow the fuel remaining in the fuel main pipe 5 and the fuel nozzle 6 into the combustion chamber;
s3: when the type of the stop signal in the S1 is that the fuel supply pressure in the fuel main pipe 5 is greater than a set value, the control module 1 receives the stop signal and then controls the compressor 2 and the electric heater 3 to start, to generate high-temperature compressed gas, the compressed gas passes through the check valve 4 and then is introduced into the fuel main pipe 5 and is divided into a plurality of branch pipes, and blows the fuel nozzle 6, so that ice crystals in the fuel main pipe 5 and the fuel nozzle 6 are rapidly melted, and fuel remaining in the fuel main pipe 5 and the fuel nozzle 6 is rapidly blown into the combustion chamber;
s4: and the compressor 2 in the S2 is shut down after being started for three minutes, and the compressor 2 and the electric heater 3 in the S3 are shut down after being started for five minutes, so that the carbon deposition prevention process of the whole fuel nozzle 6 test piece is completed.
Preferably, in this embodiment, the total pressure of the compressed gas discharged from the compressor 2 is at least 50% higher than the total pressure of the combustion chamber, so as to ensure that the fuel remaining in the fuel manifold 5 and the fuel injectors 6 is rapidly blown into the combustion chamber.
When the engine test piece is at different environmental temperatures, the adopted carbon deposition prevention method is also different.
Example 1:
in the embodiment, the room temperature of the engine test piece is more than-20 ℃, at the moment, the fuel supply pressure in the fuel oil main pipe 5 is not more than a set value during real-time detection, and the engine test piece cannot be stopped; after the bench test is finished, the type of a parking signal output by the bench test system is system parking, after the control module 1 receives the system parking signal, the compressor 2 is controlled to be started, normal-temperature compressed gas is provided for the fuel main pipe 5 and the fuel nozzle 6, fuel oil remained in the fuel main pipe 5 and the fuel nozzle 6 is rapidly blown into a combustion chamber, the compressor 2 stops after working for 3 minutes, the carbon deposition prevention process of the whole fuel nozzle 6 test piece is completed, and no fuel oil residue exists in the fuel main pipe 5 and the fuel nozzle 6.
Example 2:
in the embodiment, the combustion chamber part simulates an upper altitude plateau ignition test, at the moment, the room temperature of the engine test part is less than-20 ℃, ice crystals are generated and accumulated in an oil circuit, the oil supply pressure of a fuel oil system is gradually increased along with the accumulation of the ice crystals, and when the oil supply pressure is greater than a set value, the bench test system outputs an oil pressure detection stop signal; after the control module 1 receives an oil pressure detection stop signal, the compressor 2 and the electric heater 3 are controlled to be started, high-temperature compressed gas is provided for the fuel oil header pipe 5 and the fuel oil nozzle 6, ice crystals accumulated in an oil way can be blown and melted by the high-temperature compressed gas, residual fuel oil in the fuel oil header pipe 5 and the fuel oil nozzle 6 is blown into a combustion chamber rapidly, the compressor 2 and the electric heater 3 stop after working for 5 minutes, the carbon deposition prevention process of a whole test piece of the fuel oil nozzle 6 is completed, and no fuel oil residue is ensured in the fuel oil header pipe 5 and the fuel oil nozzle 6.
Preferably, in the present embodiment, when the operating time of the compressor 2 and the electric heater 3 is less than 5 minutes, a small amount of ice crystals still exist in the oil path and the number of ice crystals decreases as the operating time of the compressor 2 and the electric heater 3 increases; when the working time of the compressor 2 is longer than 5 minutes, the ice crystals are basically blown and melted, and the influence of an oil circuit system is avoided.
Preferably, in the embodiment, the room temperature of the engine test piece is less than-20 ℃, and ice crystals are generated and accumulated in the oil circuit system.
Preferably, in this embodiment, the temperature of the high-temperature compressed gas is at least 20% higher than room temperature and not more than 150 ℃ at maximum, so as to prevent the fuel manifold 5 from being damaged by high temperature.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a carbon deposit structure is prevented to fuel nozzle test piece which characterized in that includes:
the control module (1) is connected with the compressor (2) and used for receiving a stop signal of an engine test piece to control the start and stop of the compressor (2) and the electric heater (3);
the end, far away from the control module (1), of the compressor (2) is connected with the electric heater (3) and used for providing compressed gas to the fuel manifold (5) to blow off residual oil in the fuel nozzle (6) after the engine test piece stops;
the one end of the electric heater (3) far away from the compressor (2) is connected with the one-way valve (4) and is used for heating compressed gas during starting;
the one end of the one-way valve (4), which is far away from the electric heater (3), is connected with the fuel manifold (5), so that fuel is prevented from flowing back into the compressor (2) from the fuel manifold (5) when an engine test piece is tested;
the fuel oil system comprises a fuel oil main pipe (5), wherein one end of the fuel oil main pipe (5) is an oil inlet (501), the other end of the fuel oil main pipe (5) is connected with a plurality of branch pipes, and the branch pipes are respectively connected with fuel oil nozzles (6).
2. A carbon deposition prevention method for a fuel nozzle test piece is characterized by comprising the following steps:
s1: after the system is stopped or the fuel supply pressure in the fuel main pipe (5) is larger than a set value, the system generates different stop signals and feeds the signals back to the control module (1);
s2: when the type of the stop signal in the S1 is system stop, the control module (1) receives the stop signal and then controls the compressor (2) to start to generate normal-temperature compressed gas, the compressed gas passes through the one-way valve (4) and then is introduced into the fuel main pipe (5) and is shunted to enter the branch pipes, the fuel nozzle (6) is blown, and fuel oil remained in the fuel main pipe (5) and the fuel nozzle (6) is blown into the combustion chamber rapidly;
s3: when the type of the stop signal in the S1 is that the oil supply pressure in the fuel oil main pipe (5) is greater than a set value, the control module (1) receives the stop signal and then controls the compressor (2) and the electric heater (3) to start to generate high-temperature compressed gas, the compressed gas passes through the check valve (4) and then is introduced into the fuel oil main pipe (5) and is shunted to enter a plurality of branch pipes, the fuel oil nozzle (6) is blown, ice crystals in the fuel oil main pipe (5) and the fuel oil nozzle (6) are rapidly melted, and fuel oil remained in the fuel oil main pipe (5) and the fuel oil nozzle (6) is rapidly blown into the combustion chamber;
s4: and the compressor (2) in the S2 is shut down after being started for three minutes, and the compressor (2) and the electric heater (3) in the S3 are shut down after being started for five minutes, so that the carbon deposition prevention process of the whole fuel nozzle (6) test piece is completed.
3. A method for preventing carbon deposition on a fuel nozzle test piece according to claim 2, wherein the total pressure of the compressed gas discharged by the compressor (2) is at least 50% higher than the total pressure of the combustion chamber.
4. The method for preventing carbon deposition of the fuel nozzle test piece as claimed in claim 2, wherein the room temperature of the engine test piece in S3 is less than-20 ℃.
5. The method for preventing carbon deposition on the fuel nozzle test piece according to claim 2, wherein the temperature of the high-temperature compressed gas in the S3 is at least 20% higher than room temperature and is not more than 150 ℃.
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| CN202110772572.1A CN113551914B (en) | 2021-07-08 | 2021-07-08 | Carbon deposit prevention structure and method for fuel nozzle test piece |
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| CN202110772572.1A CN113551914B (en) | 2021-07-08 | 2021-07-08 | Carbon deposit prevention structure and method for fuel nozzle test piece |
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| CN113551914B CN113551914B (en) | 2022-04-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114923198A (en) * | 2022-03-30 | 2022-08-19 | 常德市三一机械有限公司 | Burner control method and device, burner and asphalt mixing plant |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104858186A (en) * | 2015-05-25 | 2015-08-26 | 安徽江淮汽车股份有限公司 | Cleaning device and method for inner surface of hydraulic pipe |
| CN205689340U (en) * | 2016-06-21 | 2016-11-16 | 中航商用航空发动机有限责任公司 | Aero-engine parking jettison gear, oil supply system and aero-engine |
| CN106322373A (en) * | 2016-11-07 | 2017-01-11 | 天津海泰环保科技发展股份有限公司 | High-efficiency burner spray gun |
| JP2017129518A (en) * | 2016-01-22 | 2017-07-27 | 三菱重工業株式会社 | Verification test system of flight device and verification test method |
| CN110434120A (en) * | 2019-08-30 | 2019-11-12 | 中国航发动力股份有限公司 | A kind of fuel nozzle carbon cleaning method |
| CN110595761A (en) * | 2019-10-29 | 2019-12-20 | 楼蓝科技(苏州)有限公司 | Test system for fuel nozzle performance test |
-
2021
- 2021-07-08 CN CN202110772572.1A patent/CN113551914B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104858186A (en) * | 2015-05-25 | 2015-08-26 | 安徽江淮汽车股份有限公司 | Cleaning device and method for inner surface of hydraulic pipe |
| JP2017129518A (en) * | 2016-01-22 | 2017-07-27 | 三菱重工業株式会社 | Verification test system of flight device and verification test method |
| CN205689340U (en) * | 2016-06-21 | 2016-11-16 | 中航商用航空发动机有限责任公司 | Aero-engine parking jettison gear, oil supply system and aero-engine |
| CN106322373A (en) * | 2016-11-07 | 2017-01-11 | 天津海泰环保科技发展股份有限公司 | High-efficiency burner spray gun |
| CN110434120A (en) * | 2019-08-30 | 2019-11-12 | 中国航发动力股份有限公司 | A kind of fuel nozzle carbon cleaning method |
| CN110595761A (en) * | 2019-10-29 | 2019-12-20 | 楼蓝科技(苏州)有限公司 | Test system for fuel nozzle performance test |
Non-Patent Citations (1)
| Title |
|---|
| 刘清 等: "压力开关组件故障对起动电磁活门功能的影响分析", 《现代工业经济和信息化》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114923198A (en) * | 2022-03-30 | 2022-08-19 | 常德市三一机械有限公司 | Burner control method and device, burner and asphalt mixing plant |
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