RU2639938C1 - Method for washing and preserving gas-air path of aircraft engine and device for its implementation - Google Patents

Abstract

FIELD: engines and pumps.SUBSTANCE: method for washing and preserving the gas-air path of the engine is implemented during engine idling. At the first step, the formed fine-dispersed drops of the washing-preserving solution are supplied to gas-air path in a high-pressure air flow passing through the body of the spraying device (21). At the second stage, washing and preservation are carried out by flow of air when the supply of washing-preserving solution is switched off, after which air supply and the engine are switched off.EFFECT: invention improves the quality of washing and preservation of the engine.7 cl, 6 dwg

Description

The group of inventions relates to technologies and equipment for servicing aircraft engines and can be used for washing and preserving the gas-air path (GW) of gas turbine engines (GTE).

There is a known method of flushing a gas turbine installation, according to which flushing fluid is sprayed in its air intake by means of a nozzle made in the form of a body with a plurality of nozzles, the inlet of each nozzle is connected to a flushing fluid injection means, and the nozzles are oriented in the direction of the nozzle center axis to a nodal point located on a distance of 5 to 30 cm from the nozzle exit openings, and at an angle in the direction of the central axis so that the fluid flowing from the corresponding nozzle is within angular interval from 0 ° to 80 °, was supplied under pressure in the nozzles in the range from 35 to 175 bar and with a speed in the range from 50 to 250 m / s, while the nozzles are placed on the nozzle body so that they form a spray of liquid the necessary shape (circular, elliptical or rectangular) (see RF patent No. 2343299, CL F02C 7/00, 2009).

As a result of the analysis of the known method, it should be noted that the orientation of the nozzles converging on the central axis of the nozzle at a point 5-30 cm away from their outlet openings ensures convergence of the washing liquid flows at the inlet of the gas turbine unit, which contributes to the formation of a finely dispersed medium that is captured by the flow the air intake of a working gas turbine installation, enters the cavity of the installation and flushes it. In this case, upon the formation of a finely dispersed medium, the flows of the washing liquid lose a significant part of the kinetic energy acquired at the exit from the nozzles, which cannot be completely replenished by the flow of air entering the air intake. This reduces the flushing quality of the gas turbine unit.

There is a known method of washing GTE GTE, which consists in supplying a washing device with a spray device to the input device of the engine during operation, the washing composition being supplied in the form of fine droplets (fog) with a size of not more than 20 microns for 10-12 minutes at ambient temperature.

The installation that implements the method consists of a tank for washing liquid connected by a pipeline to a spray device, moreover, a pump with a manometer, a stopcock and a filter are sequentially built into the pipeline, while a bypass channel connected to the tank and connected to the pipe is connected to the pipe behind the filter and in front of the spray device drainage of excess flushing fluid into the tank. When washing, the spray device of the installation is located in front of the engine entrance without contact with it. (see USSR AS No. 1776846, class F02C 7/30. 1992) - the closest analogue to the method.

As a result of the analysis of the known method, it should be noted that the use of finely divided drops for washing the washing composition in the form of a stream of fine droplets is very promising, however, when they exit the spraying device, they quickly lose their kinetic energy due to their low mass, which reduces the quality of washing the gas turbine engine. In addition, the flow of droplets due to their insignificant speed and mass by rotation of the engine fan blades is discarded on the walls of the air intake, eliminating the possibility of high-quality washing of engine elements located behind the fan blades. It should also be noted that the implementation of flushing for a longer duration of the engine operating mode “cold scrolling” reduces the life of the engine.

A known installation for washing GVT GTE, containing containers for washing and cleaning solutions, in the filler neck of which filters are installed. The outputs of the tanks are connected to the first three-way distribution valve, which is designed to set the modes "Cleaning" and "Flushing". The output of the first three-way distribution valve is connected to an electric pump, the output of which is connected via a pipeline with an integrated pressure measuring device to the input of the second three-way distribution valve, which has two outputs for setting the “Stirring” and “Spray” modes, and these outputs are connected by a cleaning bypass line solution into the second container with the jet mixing device of the cleaning solution located in it, and the supply hose of the washing or cleaning solution through the the filler in the spray device, installed before entering the air intake of the turbocharger of the engine, while the tanks are equipped with level indicators for each solution. In the pipeline connecting the outlet of the electric pump with the inlet of the second three-way distribution valve, a device for measuring pressure is installed. All equipment of the installation is mounted on a wheel-equipped platform with a handle for maneuvering the installation. Staples for laying sleeves with a spray device are fixed on the platform.

(see RF patent No. 2311551, CL F02C 7/30, 2007).

As a result of the analysis of the implementation of the known installation, it should be noted that the sleeve with the spray device does not have the ability to accurately set and adjust its position relative to the GTE air intake, which complicates its high-quality washing and leads to an increased consumption of washing-preserving solution (RCC). In addition, the design of the installation involves the supply of anti-ship missiles in the form of jets, and not in the form of fine droplets (fog), which also reduces the quality of washing the gas turbine engine.

A known installation for the preparation and supply of solutions for washing GTE, containing a frame equipped with wheels on which tanks for flushing fluid are mounted, the cavity of the tanks are interconnected by valves. To refuel the tanks, a hand-held portable electric pump is connected to them. Cavity cavities are connected with hoses wound on drums with dispensing fittings. A pump and a filter are installed in this communication line. The drums are equipped with mechanisms for their rotation. The tanks are equipped with level gauges to control the level of the flushing fluid in them, as well as devices to maintain its temperature within specified limits. The operation of the device is controlled from the control panel mounted on the frame.

To operate the device using a hand-held portable electric pump, the tanks are filled with appropriate liquids. The filling level of the tanks is controlled by level gauges. If necessary, carry out the heating of the medium placed in the tanks. Connect the hose fittings to the gas turbine engine connection points. The installation is ready to go.

The supply of liquids for washing the gas turbine engine is carried out in 2 stages. First, the washing solution is supplied from one tank using the feed pump through pipelines with shut-off and control valves through the filter and hose. Then, rinsing liquid is supplied from the other tank by the same pump. The flow of liquids is controlled by level gauges. If the liquid level in any of the tanks falls below the minimum allowable level, the level sensor is activated and the operation of the heaters and the pump is blocked, preventing possible breakdown of the pump when working without liquid.

At the end of the flushing, the installation is returned to its original position. The nipples are disconnected and the hoses are wound onto drums. The rotation of the drums is done manually by the corresponding handles. Spontaneous unwinding of hoses from drums is blocked by stoppers.

(see RF patent for utility model No. 140704, class B64F 5/00, 2014).

As a result of the analysis of the known solution, it should be noted that the outlet fitting of the hose does not have the ability to accurately set and adjust its position relative to the gas turbine intake, which complicates the high-quality washing of the GWT and leads to increased consumption of washing liquid and an increase in the washing time. The use of an additional electric pump for refueling tanks complicates the control system of the installation due to the use of additional electrical equipment.

A gas turbine washing unit is known, comprising a wheeled platform mounted on a platform frame, on the end wall of which a spray device is mounted, made in the form of a housing with a closed manifold on which nozzles are located, and the spray device is equipped with a mechanism for adjusting its height position. The installation includes a tank for anti-ship missiles with a filler neck and an outlet pipe connected to the pipeline connecting the tank to the spray device. The tank is equipped with pressure and temperature sensors RCC. The pump, pressure gauge and filter are sequentially included in the pipeline. (see RF patent No. 2412086, class B64F 5/00. 2011) - the closest analogue for installation.

As a result of the analysis of the known solution, it should be noted that during the installation operation at a certain distance from the nozzles, the RCC spraying ceases, since the jet has a shock force effect on the air due to its density, and, therefore, the kinetic energy of each drop decreases, which negatively affects rinsing quality. A disadvantage is also a decrease in the density of the supplied jet, which reduces the possibility of the passage of fine droplets of the jet behind the blades of a rotating fan and, as a result, the quality of washing of all engine elements decreases.

The technical result of the claimed group of inventions is to improve the quality of washing and preserving the GWT of the engine due to the use of RCC in the form of a finely dispersed jet supplied to the GWT for washing and preserving it and giving it additional kinetic energy at the inlet of the GWT due to the use of a high-pressure air flow capturing the sprayed RCC when feeding it to the engine’s GWT, as well as simplifying the design of the installation and improving the convenience of working on it by ensuring the filling of RCC, its drain, flushing the tank without using the use of additional funds, as well as through the withdrawal of control valves to a single control panel - a hydraulic console.

The specified technical result is ensured by the fact that in the method of washing and preserving the gas-air duct of an aircraft engine, according to which a spray device equipped with nozzles is arranged opposite the engine air intake, the engine is started, and then a washing-preserving solution is supplied from the nozzles of the spray device to the gas-air duct in the form of fine droplets, washing and preserving the gas-air path of the engine, is new the fact that the washing and preservation of the gas-air duct of the engine is carried out when the engine is idling in two stages, and at the first stage of washing and preservation, the formed fine-dispersed droplets of the washing-preserving solution are supplied to the gas-air duct in a high-pressure stream of air passed through the housing of the spray device, and at the second stage, the washing and preservation of the gas-air path is carried out by an air flow with the supply of the washing-preserving solution turned off, after Ia is switched off and the air supply motor.

In the installation for flushing and preserving the gas-air duct of an aircraft engine, including a wheeled platform, a skeleton mounted on the platform, on which a spray device is mounted, containing a manifold with nozzles installed on it and having the possibility of adjusting movements relative to the air intake of the gas-air duct mounted on the tank platform for flushing and preserving solution with a filling neck and an outlet pipe, a pipeline with a pump and filter included in it the throma connected to the outlet of the tank and having the ability to connect to the manifold of the spray device, it is new that the spray device is made in the form of a nozzle-shaped body, the collector of the spray device is located at the output end of the body and is made in the form of a hollow torus, the cavity of which is connected with the pipeline by means of a flexible hose, and the installation is equipped with an air blower mounted on the platform, the output of which is connected to the input end of the spray housing the device by means of a sleeve made of soft gas-tight material, while the installation can be equipped with a control panel to which the valves for controlling the supply of washing-preserving solution to the spraying device, filling the tank and draining the washing-preserving solution from it are installed, and an inlet fitting is installed on the pipeline and an inlet valve connected to the pump and tank, and a drain valve can be installed behind the filter and in front of the flexible hose.

The pipeline can be connected to the outlet of the tank by means of an additional pipe, in which a valve is installed, designed to control the supply of washing-preserving solution from the tank to the pipeline during operation of the installation and to drain it from the tank after the end of work, and connected to the tank filler neck additional pipeline, in which a valve is installed, designed to control the filling of the tank with a washing-preserving solution.

In the claimed group of inventions, one of the inventions (installation) is intended to implement another (method), therefore, they form a single inventive concept, and the requirement of the unity of the invention in the application materials is met.

The essence of the claimed group of inventions is illustrated by graphic materials on which are given:

- in FIG. 1 - installation, side view;

- in FIG. 2 is a view A of FIG. one;

- in FIG. 3 - location of the installation in front of the air intake of the aircraft engine during flushing and preservation of the GW;

- in FIG. 4 - section BB in FIG. 2;

- in FIG. 5 - place I of FIG. 2;

- in FIG. 6 is a diagram of the installation of pneumohydraulic.

The installation for washing and preserving the GWT of an aircraft engine is a platform 1 on wheels 2, adapted for towing and maneuvering with a carrier 3 mounted on platform 1. On the platform 1 there is a tank 4 for anti-ship missiles (for example, ZOK-27) connected to pipeline 5 equipped with inlet 6 and valve 7.

The installation is equipped with a control panel 8, on the panel of which the valves 9, 11, 12, 14 and manometer 10 are displayed.

The valve 9 is installed on the pipeline 5, followed by the pressure gauge 10 installed on the pipeline 5. The valve 9 is used to control the supply of RCC through the pipeline 5 to the system for flushing and preserving the GWT, and the pressure gauge 10 is used to control the pressure of the RCC in the pipeline 5.

The valve 11 is installed in an additional pipe (not indicated by the position) connecting the pipe 5 with the filler neck of the tank 4 and is designed to control the filling of the tank 4 RCC.

The valve 12 is installed in an additional pipeline (not indicated by the position) connecting the pipeline 5 with the outlet pipe of the tank 4, and is designed to control the supply of RCC from the tank to the pipeline 5 during the operation of the installation and to drain the RCC from the tank 4 after the end of its operation. The valve 14 is designed to drain the RCC from the tank 4.

In the pipeline 5, a pump 13 and a filter 15 are connected in series.

The installation is equipped with a supercharger 16 for air flow mounted on the platform 1. The supercharger is made in a known manner, for example, in the form of a standard drive fan.

On the platform 1 is mounted frame 17 with side and end walls. The side walls are decorated with doors (positions are not indicated) designed to access the components and assemblies of the installation when working on it, during their maintenance and repair. The end walls are indicated by the numbers 18 and 19. On the end wall 18 the input fitting 6 of the pipe 5 is brought out.

A spray device 21 is mounted on the end wall 19 by a mechanism 20. The mechanism 20 has the ability to vertically adjust the spray device 21 by means of a drive 22.

The mechanism 20 can be made in various known ways, for example, in the form of two pairs of strips mounted on two opposite sides relative to the spray device, connected at one end to the spray device, and a roller is installed at the other end of each pair (not indicated by the position) placed in the rails end wall 19. The drive movement of the mechanism can be made in the form of a lever-screw transmission. The mechanism and drive are made in a manner known to those skilled in the art. Their design is not subject to patent protection.

On the end wall 19 there is installed a tee 23 included in the pipeline 5, the input of which is connected to the output of the filter 15, and at one of its outputs a valve 24 is installed to drain the RCC.

The spraying device 21 is made in the form of a housing having a nozzle shape, for example, conical, at the outlet end of which a collector 25 is installed on the outer surface, having the shape of a hollow torus, with a cavity communicating with nozzles 26 mounted on the collector in one or several rows. An inlet pipe 27 is connected to the collector cavity, connected by a flexible hose 28 to another outlet of the tee 23.

The outlet pipe 29 of the tank 4 through the pipeline in which the valve 12 is installed, through the pipe 5 is connected to the inlet pipe of the pump 13 and through the valve 7 to the fitting 6 of the pipe 5.

To control the upper and lower levels of the RCC tank 4 is equipped with level sensors 30.

A pipe 31 connected to the end wall 19 is connected to the output of the supercharger 16. An air duct 32 is connected to the pipe 31 through an opening (not shown) in the wall 19 and is connected by the output end to the inlet end of the housing of the spray device 21. The air duct 32 is made in the form of a sleeve made of soft gas-tight material, for example, ATOM-1. This embodiment of the duct 32 facilitates the assembly of the structure and provides unimpeded movement of the spray device in a vertical plane during its commissioning.

The components and assemblies of the installation, the design of which is not disclosed in this application, are known and do not constitute the subject of patent protection.

Installation, implementing the inventive method, works as follows.

Initially refueling tank 4 RCC. To fill the tank 4, connect the filling nozzle of the tanker (not shown) of RCC, for example, ZOK-27 or a mixture of this liquid with water, to the nozzle 6, after which valve 7 and valve 11 are opened. Valves 9, 12, 14 are closed. The pump 13 is turned on and the RCC is supplied to the tank 4. When the filling of the RCC tank reaches the upper level sensor 30, the pump 13 is automatically turned off, the filling of the tank 4 is completed. Valves 7 and 11 are closed, the refueling nozzle of the tanker is disconnected from the nozzle 6.

The installation by means of a carrier 3 is connected to a vehicle (not shown), which moves the installation and sets it relative to the object so that the spray device 21 is located in the same vertical plane with the air intake of the GW of the engine.

Next, adjust the position of the spray device 21 in height to match the position of its collector 25 with the inlet channel of the engine air intake. Such regulation is carried out by the drive 22. The installation and its spray device are set to the desired position and ready for operation.

To carry out flushing and preservation of GVT, they turn on the object’s engine and put it to idle mode. The entire cycle of flushing and preservation of the GWT does not exceed the duration of the engine idle mode. At the control panel 8, the valves 9 and 12 are opened, the supercharger 16 of the air flow is started, the pump 13 is turned on. The valves 7, 11, 14, 24 are closed.

By means of the pump 13 RCC from the tank 4 through the valves 12 and 9, the filter 15, the tee 23, the flexible hose 28 enters the inlet pipe 27 and then, under pressure, into the cavity of the manifold 25. The pressure of the RCC in the pipeline 5 during the operation of the installation is controlled by a manometer 10 .

From the cavity of the collector, RCC under pressure enters the inlet of nozzles 26, at the outlet of which it is converted into a stream of fine droplets that form fog.

In parallel with the supercharger 16, the high-pressure air flow through the pipe 31 and the air duct 32 under pressure enters the cavity of the atomizer body and, at the outlet, it captures RCC particles, which, under the influence of the air flow, receive an additional speed and, therefore, kinetic energy, and at high speed under pressure the formed gas-liquid mixture enters the air intake, through which due to the high kinetic energy of the RCC particles it enters all the cavities of the engine’s GW, producing high-quality washing and preservation of its elements. Due to the fact that the housing of the spraying device is made in the form of a nozzle, the air flow coming into it from the supercharger receives a predetermined direction in order to capture all of their RCC nozzles 26 to form a gas-air mixture, and due to the conical shape, increasing the air velocity at the outlet of nozzles. The minimum air flow pressure is at least 2 atmospheres. At lower air flow pressures, guaranteed delivery of anti-ship missiles to all components and components of the main heater is not ensured. The maximum pressure is not strictly limited and, as a rule, is limited by the design capabilities of the supercharger.

After a certain time has elapsed (this time is slightly less (5-8 seconds) the engine idle time), turn off the pump 13, close the valves 9 and 12. The first stage of washing and preservation is completed.

To remove washed away contaminants and residues of the flushing components of the anti-pumping system from the engine’s GVT, the second stage of washing and preservation is intended. It consists in the fact that after turning off the pump 13, the supercharger 16 continues to operate for 5-8 seconds, supplying air to the GW. This can significantly improve the quality of washing and preservation.

The full washing and preservation cycle does not exceed the time of the engine idle operation. This allows you to use the standard engine operating time at its most economical mode, and, therefore, minimize its resource during maintenance work.

The flushing and preservation of the GWT engine is completed.

By means of carrier 3, the installation is moved to another engine of the object or to the storage location.

To drain the remaining RCC from the tank 4, open the valves 12 and 14 and turn on the pump 13. The valves 7, 11, 9 are closed.

The discharge of the RCC from the filter 15, the hose 28 and the manifold 25 is carried out through the open valve 24.

The development of the method using the installation was carried out on the GVT of the RD-33MK engine. As RCC, we used a composition consisting of distilled water and ZOK-27 liquid, prepared in a concentration of four parts of distilled water and one part of ZOK-27 liquid. The prepared PRK was poured into the installation tank. The installation was positioned so that the spray device was opposite the engine air intake. They turned on the engine and brought it to idle. The pump and the compressor of the installation were turned on, supplying RCC and air to the engine’s GW. The temperature of the RCC was 20 ° C. RCC consumption - 25 liters in 20 seconds. Air consumption - 15000 cubic meters per hour. Air pressure - 0.16 MPa. Pressure - RCC at the outlet of the nozzles - 1.0 MPa. The processing time during the joint operation of the pump and supercharger is 20 seconds. They turned off the pump. The treatment of GW by air of the supercharger was carried out for 5 seconds. Disable the supercharger. They turned off the engine. After processing, the processed surfaces were monitored both visually and by means of the T-99-88 endoscope. No residual contaminants were found on the surfaces of GWT parts machined by RCC.

The proposed method allows to improve the quality of washing and preservation of the engine by giving the stream of finely dispersed RCC chambers greater speed and, consequently, greater kinetic energy, which can improve the removal of contaminants from the walls of the GWT of an aircraft gas turbine engine and turbine blades, while ensuring that the GWT of the engine is cleaned of the remaining RCC and washed away pollution.

The proposed installation provides the implementation of the above method of flushing and preserving the GWT gas turbine engine, it is structurally simple by using a single engine to refuel the tank, pump the RCC and drain the remaining RCC from the tank, convenient in operation by displaying the main number of valves on the control panel and providing simple regulation of the sprayer in height.

The proposed method and installation made it possible to flush the GVT of the aircraft gas turbine engine during one of its scrolling cycles in idle mode, which allows the gas turbine engine resource to be saved.

Claims (7)

1. A method of washing and preserving the gas-air duct of an aircraft engine, according to which a spray device equipped with nozzles is arranged opposite the engine air intake, the engine is started, and then a washing-preserving solution in the form of fine droplets is supplied into its gas-air tract from the nozzles of the spray device under pressure, producing flushing and preserving the air duct of the engine, characterized in that the flushing and preservation of the air duct of the engine The atelier is carried out when the engine is idling in two stages, and at the first stage of washing and preservation, the supply of formed fine droplets of the washing-preserving solution into the gas-air path is carried out in a high-pressure stream of air passing through the housing of the spray device, and at the second stage, the washing and preservation of the gas-air the path is led by an air stream with the supply of the washing-preserving solution turned off, after which the air supply and the engine are turned off. 2. Installation for washing and preserving the gas-air duct of an aircraft engine, including a wheeled platform, a skeleton mounted on the platform, on which a spray device is mounted, containing a manifold with nozzles mounted on it and having the possibility of adjusting movements relative to the air intake of the gas-air duct mounted on the platform tank for flushing and preserving solution with a filling neck and an outlet pipe, pipeline, with a pump and fil trom, connected to the outlet of the tank and having the ability to connect to the manifold of the spray device, characterized in that the spray device is made in the form of a housing having the shape of a nozzle, the collector of the spray device is placed at the output end of the housing and is made in the form of a hollow torus, the cavity of which is connected with the pipeline through a flexible hose, and the installation is equipped with an air blower mounted on the platform, the output of which is connected to the input end of the spray housing stroystva by sleeves made of soft material is gastight. 3. Installation according to claim 2, characterized in that the pipeline is connected to the outlet of the tank through an additional pipe in which a valve is installed to control the flow of washing-preserving solution from the tank into the pipeline during installation and to drain it from the tank after finish work. 4. Installation according to claim 2, characterized in that the pipeline is connected to the tank filler neck through an additional pipe in which a valve is installed to control the tank filling with a washing-preserving solution. 5. Installation according to claim 2, characterized in that it is equipped with a hydraulic console, onto which the control valves for supplying the washing-preserving solution to the spraying device, filling the tank and draining the washing-preserving solution from it are withdrawn. 6. Installation according to claim 2, characterized in that the inlet fitting and inlet valve connected to the pump and tank are installed on the pipeline. 7. Installation according to claim 2, characterized in that a drain valve is installed on the pipeline behind the filter and before the flexible hose.

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