Outfield cleaning method for aero-engine

Abstract

The aero-engine outfield cleaning method is suitable for cleaning an engine of a conveyor outdoors, the conveyor is provided with a cleaning device, idling of the engine in the non-fuel-injection state serves as false driving, and the aero-engine outfield cleaning method comprises the steps that in the false driving state, the rotating speeds of the engine in all states of cold running are obtained, and the rotating speeds of the engine in all states of cold running are obtained; different threshold values are set in an engine control system, whether the rotating speed exceeds the matched threshold value or not is judged so as to control a parking pull rod or a shifting button of the engine to be always kept at a parking position in a physical state and / or a throttle lever to be always kept at a slow position, and a state signal is fed back; and the engine control system controls the cleaning device to complete surface cleaning and cleaning of the engine runner part according to the state signal, and the use safety, reliability and economical efficiency of the engine are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engine outdoor cleaning method, and particularly relates to an aero-engine field cleaning method. BACKGROUND

[0002] A certain type of series engine has a long overhaul life. According to the current use of the field, during the service process, the surface of the internal air and gas flow passage parts (referred to as "flow passage parts") is attached with dust in the air, which increases the flow loss of the engine, reduces the efficiency of the parts, causes the engine to have performance degradation such as thrust decline, exhaust temperature, and oil consumption rate increase, and even causes the compressor and turbine blades to be broken due to long-term use corrosion, resulting in engine damage and other safety risks. The traditional method is completed in the indoor cleaning rack, and cannot be used for cleaning in outdoor environments such as grasslands and deserts. The cost of improving transportation is high, and the filling of the indoor cleaning of the transport machine is blank.

[0003] Therefore, the present application is proposed. SUMMARY

[0004] The purpose of the present application is to provide an aero-engine field cleaning method, which can significantly improve the use safety, reliability and economy of the engine. The technical solution of the present application has many technical benefits, which are described below: An aero-engine field cleaning method is suitable for cleaning the engine of a transport machine outdoors. The transport machine is provided with a cleaning device. The engine is idled as a false start in a state without oil injection. The method comprises the following steps: in the false start state, the rotation speed of the engine in each state of cold operation is obtained, different threshold values are set in the engine control system, it is judged whether the rotation speed exceeds the matched threshold value to control the parking lever or the knob of the engine to always remain in the parking position in the physical state and / or the throttle lever to always remain in the slow speed position, and a state signal is fed back; the engine control system controls the cleaning device to complete the surface cleaning and cleaning of the flow passage parts of the engine according to the state signal, thereby improving the use safety, reliability and economy of the engine.

[0005] Compared with the prior art, the technical solution provided by the present application has the following beneficial effects: The method fills the blank of the current global transport machine cleaning which can only be cleaned in the machine station or indoors. For the global new type certain transport machine, when the engine performance decays, the flow passage parts are restored to the original aerodynamic shape and engine use performance by field cleaning to remove the pollutants in time, thereby reducing the engine overhaul cost and prolonging the engine use time. BRIEF DESCRIPTION OF DRAWINGS

[0006] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0007] Figure 1 Flowchart of the present application. DETAILED DESCRIPTION

[0008] The above embodiments are only some of the embodiments of the present application, not all the embodiments. The present application can also be implemented or applied by other different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0009] It should be noted that the various aspects of the embodiments described below are within the scope of the appended claims. It should be apparent that the aspects described herein can be embodied in a wide variety of forms and that any specific structure and / or function described herein is merely illustrative. Based on the present disclosure any aspect described herein can be implemented independently of any other aspect and various examples of implementations commencing with any aspect can be implemented with respect to any other aspect. For example, an apparatus can be implemented to perform a method in which any number of the aspects described herein are used. In addition, the methods can be implemented by an apparatus that does not necessarily implement other than the particular method. Further, different methods can be implemented by an apparatus.

[0010] It should also be noted that the drawings provided in the following embodiments are only schematic - schematically showing the components of the present application that are related to the disclosure, each unit being shown by a generalized symbol whose details are not shown in the drawings, and the drawings should not be considered as limiting the scope of the present application. The drawings provided in the following embodiments are only schematic - schematically showing the components of the present application that are related to the disclosure, each unit being shown by a generalized symbol whose details are not shown in the drawings, and the drawings should not be considered as limiting the scope of the present application. The actual details of each unit can vary greatly depending on the specific implementation.

[0011] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that aspects can be practiced without these specific details. To enable those skilled in the art to better understand the invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, unless otherwise stated, "a plurality of" means two or more.

[0012] like Figure 1 The illustrated field cleaning method for aircraft engines is applicable to outdoor cleaning of transport aircraft engines equipped with cleaning devices. The method involves idling the engine without fuel injection as a dummy start-up. The method includes... In a simulated running state, the engine speed is acquired under various cold-running conditions. Different thresholds are set in the engine control system to determine if the speed exceeds the matched threshold. This controls the engine's stop lever or toggle switch to maintain a physical stop position and / or the throttle lever to maintain an idle position, and a status signal is fed back. Based on the status signal, the engine control system controls the cleaning device to complete the surface cleaning of the engine flow passage components. This method fills the gap in current global transport aircraft cleaning, which is limited to station or indoor cleaning. For a certain new type of transport aircraft, when engine performance deteriorates due to wear and tear, field cleaning can promptly remove contaminants, restore the original aerodynamic shape of the flow passage components and engine performance, reduce engine overhaul costs, and extend engine service life.

[0013] In one specific embodiment, determining whether the rotational speed exceeds the matched threshold includes, The engine performs the first false start, judges whether the engine speed in the cold running state exceeds 10-12% of the maximum speed in the cold running state, if yes, generates the first state signal and feeds back the control system, controls the cleaning device to spray the cleaning working liquid to the high and low pressure compressors in the engine through the controller, and the engine parking lever or the physical state of the knob always keeps the parking position, and the throttle lever always keeps the slow position, if no, the engine continues to idle for a preset time, and then the first state signal is fed back when the speed reaches 12% of the maximum speed, the controller controls the cleaning device to spray the cleaning working liquid to the high and low pressure compressors in the engine, and the engine parking lever or the physical state of the knob always keeps the parking position, and the throttle lever always keeps the slow position. The false start is stopped when the cleaning working liquid is sprayed; the purpose is to keep the engine running at this speed to ensure that the cleaning liquid can be uniformly sprayed on the surface of the flow passage parts to improve the cleaning efficiency.

[0014] Further, the judgment of whether the speed exceeds the matched threshold value further includes, After the first false start, the engine is controlled to perform the second false start after parking for a preset time of 30 minutes, when the starter begins to work, the speed is fed back through the corresponding set speed sensor, it is judged whether the engine speed in the cold running state exceeds 10-12% of the maximum speed in the cold running state, if yes, the second state signal is generated and fed back to the control system, the cleaning device is controlled to spray the cleaning working liquid to the high and low pressure compressors in the engine through the controller, and the engine parking lever or the physical state of the knob always keeps the parking position, and the throttle lever always keeps the slow position, if no, the engine continues to idle for a preset time, and then the second state signal is fed back when the speed reaches 12% of the maximum speed, the controller controls the cleaning device to spray the cleaning working liquid to the high and low pressure compressors in the engine, and the engine parking lever or the physical state of the knob always keeps the parking position, and the throttle lever always keeps the slow position, the second cleaning ensures the concentration and residence time of the cleaning liquid on the flow passage parts, preferably, the cleaning device sprays the cleaning working liquid to the high and low pressure compressors in the engine as the cleaning agent type working liquid during the first and second false starts.

[0015] In a specific embodiment, after the second false start, the engine is parked for a preset time of 6-8 hours, the cleaning spray pipe of the low pressure compressor is disassembled, and the flow passage parts of the low pressure compressor are cleaned in an artificial way, and then installed after cleaning. The flow passage parts include the inlet guide vane, the low pressure compressor I stage rotor vane and the inlet fairing, for example, the cleaning working liquid is used to clean by using a brush or a cloth.

[0016] In a specific embodiment, the judgment of whether the speed exceeds the matched threshold value further includes, The engine is started for the third time, and when the starter begins to work, it is determined whether the engine speed in the cold running state exceeds 15% of the maximum speed in the cold running state (after cleaning, the engine tends to the most initial working state, generally, the sound is larger, which proves that the previous cleaning plays a role in clearing impurities). If so, a third state signal is generated and fed back to the control system, and the cleaning device is controlled by the controller to spray cleaning working fluid into the high and low pressure compressors of the engine, and the engine stop lever or knob is always kept in the parking position in the physical state, and the throttle lever is always kept in the slow position. The detection device arranged at the engine liquid discharge port detects whether the suspended solids of the engine discharge water quality reaches the preset standard value (the particle size diameter of black water is judged), and if so, the cleaning device is cleaned with distilled water or clean water, and if not, the cleaning device is cleaned with distilled water or clean water less than 5 times. If the engine speed in the cold running state does not exceed 15% of the maximum speed in the cold running state, the control is continued until 15% of the maximum speed is reached, a third state signal is generated and fed back to the control system, and the detection device detects whether the suspended solids of the engine discharge water quality reaches the preset standard value, and if so, the cleaning device is cleaned with distilled water or clean water, and if not, the cleaning device is cleaned with distilled water or clean water less than 5 times.

[0017] In a specific embodiment, determining whether the speed exceeds the matched threshold value further includes, The engine is started for the fourth time, and the cleaning device is cleaned with distilled water or clean water. When the running time of the simulated start is preset, such as about 40s, the engine stop lever or knob is placed in the working position, the engine fuel nozzle starts to supply oil, and when the engine fuel nozzle oil pressure rises for 3-10s, the engine stop lever or knob is placed in the parking position again, the oil supply to the engine is stopped, and the cleaning device is stopped at the same time.

[0018] Further, after the fourth simulated start of the engine is completed, the engine is cold running, and the on-board drying device blows water in the engine air duct.

[0019] Overall, the positive effects of the method are as follows: 1. Ensure the safe use of the engine in the field. China has a vast territory, and the meteorological conditions and geographical environment of some airports are complex. The environment in some areas is harsh, such as the atmospheric environment of an airport near an industrial city or a factory, the sand and dust atmospheric environment of an airport near a desert or a desert, and the typical marine atmospheric environment of a task along / crossing the sea. The impurities and pollutants in the air are easily attached to metal parts when the engine is parked and working in these complex environments. Regular cleaning and maintenance of the engine can greatly improve its durability in harsh environments and reduce the safety risks caused by salt spray corrosion.

[0020] 2、Guarantee engine field reliable use. In the conventional environment parking and working engine will also produce dirt accumulation, so that its internal air gas flow channel effective flow area becomes smaller, flow loss increases, compression air efficiency reduces. To achieve take-off thrust / power requirements must burn more fuel, also increases the engine turbine front gas temperature, so that the fatigue strength of engine hot end components reduces, more easily cause fatigue creep, reduces engine working reliability, directly shortens the service life of hot end components. Regular cleaning engine air gas passage can reduce the engine turbine front temperature, improves the reliability of the engine.

[0021] 3、Guarantee engine thrust stable use. In the use of engine, dust, pollen, salt, small particles contained in the air, under the adsorption of static electricity, liquid material, etc. will adhere to the engine air gas passage blade and passage surface. Therefore, with the increase of engine use time, its internal airflow passage is easy to get dirty. Dirt will change the aerodynamic shape of the blade, narrow the passage between the blades, reduce the flow capacity, at the same time reduce the surface finish of the blade, increase the flow loss, directly affect the compressor efficiency reduces, appears the engine thrust attenuation. When the engine performance attenuation, timely remove the corrosion medium, restore the original aerodynamic shape of the blade and reduce the flow loss, can restore the engine thrust performance to a certain extent, so as to reduce the repair cost, greatly prolong the engine use time The above has carried out the detailed introduction to the product provided by the present application. The principle and implementation mode of the present application are described by applying specific examples in this paper. The above example is only used to help understand the core idea of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the principle of the present application, the present application can be improved and modified in several ways. These improvements and modifications also fall within the protection scope of the present application.

Claims

1. A method of field cleaning an aeroengine, suitable for cleaning the engine of a transport aircraft in the open air, characterised in that, The transport machine is provided with a cleaning device, and the engine is idled in a state without oil injection as a false start, and the method comprises, In the false start state, the engine speed in each state of cold operation is obtained, and different threshold values are set in the engine control system to determine whether the speed exceeds the matched threshold value to control the parking lever or the knob of the engine to always remain in the parking position in the physical state and / or the throttle lever to always remain in the slow speed position, and a state signal is fed back; The engine control system controls the cleaning device to complete the surface cleaning of the engine flow passage parts according to the state signal.

2. The aeroengine field washing method of claim 1, wherein, The determination whether the speed exceeds the matched threshold value comprises, The engine is started for the first time, and it is determined whether the engine speed in the cold operation state exceeds 10-12% of the maximum speed in the cold operation state, if yes, a first state signal is generated and fed back to the control system, the controller controls the cleaning device to spray cleaning working liquid to the high and low pressure compressors in the engine respectively, and the parking lever or the knob of the engine always remains in the parking position in the physical state and the throttle lever always remains in the slow speed position, if no, the engine is continuously idled for a preset time period, and when the speed reaches 12% of the maximum speed, the first state signal is fed back, the controller controls the cleaning device to spray cleaning working liquid to the high and low pressure compressors in the engine respectively, and the parking lever or the knob of the engine always remains in the parking position in the physical state and the throttle lever always remains in the slow speed position.

3. The aeroengine field-washing method of claim 2, wherein, The determination whether the speed exceeds the matched threshold value further comprises, After the first false start is completed and parked for a preset time period, the engine is started for the second time, and it is determined whether the engine speed in the cold operation state exceeds 10-12% of the maximum speed in the cold operation state, if yes, a second state signal is generated and fed back to the control system, the controller controls the cleaning device to spray cleaning working liquid to the high and low pressure compressors in the engine respectively, and the parking lever or the knob of the engine always remains in the parking position in the physical state and the throttle lever always remains in the slow speed position, if no, the engine is continuously idled for a preset time period, and when the speed reaches 12% of the maximum speed, the second state signal is fed back, the controller controls the cleaning device to spray cleaning working liquid to the high and low pressure compressors in the engine respectively, and the parking lever or the knob of the engine always remains in the parking position in the physical state and the throttle lever always remains in the slow speed position.

4. The aeroengine field-washing method of claim 3, wherein, During the first false start and the second false start, the cleaning device sprays cleaning working liquid to the high and low pressure compressors in the engine.

5. The aeroengine field-washing method of claim 3, wherein, After the second false start is completed, the engine is parked for a preset time period, the cleaning spray pipe of the low pressure compressor is removed, and the flow passage parts of the low pressure compressor are cleaned manually.

6. The aeroengine field-washing method of claim 5, wherein, The flow passage parts comprise air inlet guide vanes, low pressure compressor stage 1 rotor vanes and air inlet fairing.

7. The aeroengine field-washing method of claim 6, wherein, The determination whether the speed exceeds the matched threshold value further comprises, The engine is third false start, determine whether the engine in the cold state of rotation to reach more than 15% of the maximum speed in the cold state, if so, the third state signal and feedback control system, through the controller control cleaning device to the engine respectively high, low pressure compressor spray cleaning work liquid, and the engine stop rod or pull button in the physical state always keep the parking position, throttle lever always keep the slow position, through the engine discharge port detection device to detect the engine discharge water quality suspended solids whether to reach the preset standard value, if so, the cleaning device distillation water or clean water cleaning, if not, the cleaning device less than 5 times of distilled water or clean water cleaning; When the engine in the cold state of rotation to reach not more than 15% of the maximum speed in the cold state, the engine continues to idle until to reach 15% of the maximum speed, and generate the third state signal and feedback control system, through the detection device to detect the engine discharge water quality suspended solids whether to reach the preset standard value, if so, the cleaning device distillation water or clean water cleaning, if not, the cleaning device less than 5 times of distilled water or clean water cleaning.

8. The aeroengine field-washing method of claim 7, wherein, By judging whether the speed exceeds the matched threshold value also includes, The engine is fourth false start, control cleaning device using distilled water or clean water cleaning, when the false start running preset time, the engine stop rod or pull button is placed in the working position; The engine fuel nozzle start oil supply, and when the engine fuel nozzle oil pressure rises 3~10s, the engine stop rod or pull button is placed in the parking position again, stop to engine oil supply, and at the same time cleaning device stop working.

9. The aeroengine field-washing method of claim 8, wherein, After the fourth false start of the engine, the engine is cold running, the on-board drying device blowing engine air pipe in the water.

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