A low power extracted fluidic pre-cool control system

Abstract

The application belongs to the technical field of aero-engines, and particularly relates to a low-power extraction jet precooling control system. The jet precooling water supply adopts an anti-icing control accessory and an anti-freezing electromagnetic valve. Air is introduced to externally blow the accessories of the jet precooling control device by using the anti-icing control accessory, so as to prevent surface icing. After the jet precooling stops working, the anti-freezing control accessory is used to introduce air to the three-zone outlet of the jet precooling control device to the jet precooling nozzle. Before entering a low-temperature environment, water stored in the pipeline is blown away in advance, so as to prevent the water from freezing. Not only is the freezing risk in the flight process reduced, but also the requirement for the storage and maintenance of the unit after landing on the ground is simplified, the use range of the domestic jet precooling assembly unit is expanded, and the plane can still fly safely and highly maneuverably under the conditions of extreme cold and extreme north.

Description

Technical Field

[0001] This application belongs to the field of aero-engine technology, and specifically relates to a jet precooling control system for low-power extraction. Background Technology

[0002] In recent years, extensive research has been conducted both domestically and internationally on jet pre-cooling expansion envelopes for turbine engines. This involves installing a water-jet pre-cooling device in the air intake, injecting atomized liquid water into the intake, and reducing the engine inlet's overall temperature through water evaporation and heat absorption. This approach aims to increase aircraft flight speed without altering the turbine engine's geometric, pressure, temperature, and speed limitations.

[0003] To cope with the problem of high-temperature incoming flow, hypersonic aircraft turbine engines need to use jet precooling technology to expand the envelope. The success or failure of the jet precooling system directly determines the engine's ability to expand the envelope. To ensure the normal operation of jet precooling, the design of the jet precooling control system is one of the core key technologies of aerospace engines.

[0004] Hypersonic aircraft operate in low-temperature environments, and the water medium used for jet precooling will freeze below 0°C, causing pipe blockages and bursts. This not only affects the jet precooling function but also poses safety hazards.

[0005] When the jet precooling is in operation, it is during the transition period between the turbine base and the ramjet base, and the power of the jet precooling water pump is provided by the turbine base. When the jet precooling is off, the jet precooling water pump needs to run continuously, requiring a large amount of power and resulting in waste. Summary of the Invention

[0006] To address the above issues, including:

[0007] Water source;

[0008] Water supply device; pumps water from the water source to the jet precooling control device;

[0009] The jet precooling control device has a metering valve, and a sensing device connected to the jet precooling controller is installed on the metering valve. The sensing device senses the working parameters of the metering valve.

[0010] The jet pre-cooling injection device sprays water from the jet pre-cooling control device onto the air intake duct;

[0011] The jet precooling controller generates a control current for controlling the metering valve and a control current for controlling the water pump based on the sensing device of the metering valve and the sensing device installed at the engine inlet.

[0012] The anti-icing module includes an anti-icing control accessory, which introduces engine bleed air into the jet pre-cooling injection device and blows anti-icing air onto the icing location of the jet pre-cooling injection device.

[0013] The antifreeze module includes an antifreeze solenoid valve, which purges the easily frozen pipelines with gas from the aircraft gas cylinder.

[0014] The water supply device includes: an aircraft pump, a high-pressure water pump, a solenoid valve, a flow control valve, and a return pipeline;

[0015] Aircraft pumps are used to extract water from water sources.

[0016] Solenoid valve, used to control flow rate and control valves;

[0017] High-pressure water pumps pressurize the water pumped by the aircraft and supply it to the jet precooling injection device;

[0018] The return pipeline connects the outlet of the high-pressure water pump to the water source;

[0019] Flow control valves are connected to the high-pressure water pump and the aircraft pump, respectively.

[0020] Among them, the flow control valve distributes water from the aircraft pump to the high-pressure water pump and the return pipeline in two modes based on the on / off state of the solenoid valve.

[0021] Mode 1: When the solenoid valve is de-energized, the flow control valve reduces the flow rate of the aircraft pump through the high-pressure water pump. The water pressure at the outlet of the high-pressure water pump is less than the opening threshold of the inlet of the jet pre-cooling injection device, and the water at the outlet of the high-pressure water pump flows back to the water source through the return pipeline.

[0022] Mode 2: When the solenoid valve is energized, the flow control valve increases the flow rate of the aircraft pump through the high-pressure water pump. The water pressure at the outlet of the high-pressure water pump is greater than the opening threshold of the inlet of the jet precooling injection device. Part of the water at the outlet of the high-pressure water pump flows back to the water source through the return pipe, and part flows into the jet precooling injection device.

[0023] Preferably, the flow control valve includes a sleeve and a piston installed in the sleeve. The piston includes a first piston and a second piston, a first control chamber is formed between the first piston and the second piston, a second control chamber is formed between the first piston and the end face of the sleeve, a third control chamber is formed between the second piston and the end face of the sleeve, a first adjustable valve is formed between the first piston and the sleeve hole, and a second adjustable valve is formed between the second piston and the sleeve hole.

[0024] The high-pressure water pump includes a first pump chamber and a second pump chamber. The water at the pump outlet is the first pressurized water. After passing through the first pump chamber, the first pressurized water becomes the second pressurized water. The second pressurized water passes through the first adjustable valve and enters the second pump chamber to form the third pressurized water. The third pressurized water is supplied to the jet pre-cooling injection device through the second adjustable valve. The first pressurized water is connected to the third control chamber, and the second pressurized water is connected to the second control chamber. The opening and closing of the solenoid valve respectively connects the third control chamber or the water tank pipeline to the first control chamber. The pressure difference between the third control chamber and the first control chamber pushes the second piston to move, thereby adjusting the opening of the second adjustable valve. The pressure difference between the second control chamber and the first control chamber pushes the first piston to move, thereby adjusting the opening of the first adjustable valve.

[0025] Preferably, the metering valve includes a first-zone metering valve, a second-zone metering valve, and a third-zone metering valve that run in parallel with each other; the first-zone metering valve, the second-zone metering valve, and the third-zone metering valve supply water to the jet precooling injection device individually or simultaneously.

[0026] Preferably, the metering valve sensing device includes a displacement sensor for measuring the opening degree of the metering valve and a pressure sensor for measuring the outlet pressure of the metering valve.

[0027] Preferably, the sensing device at the engine inlet includes a temperature sensor and a pressure sensor box circumferentially mounted at the engine inlet.

[0028] Preferably, the jet precooling controller is connected to a monitoring system, which is used to display the working status of the jet precooling controller.

[0029] Preferably, the metering valve is equipped with a water supply cut-off valve, and the emergency water supply cut-off function is achieved through the water supply cut-off valve by the command of the jet precooling controller.

[0030] The advantages of this application include: the jet precooling water supply uses anti-icing control accessories and anti-freezing solenoid valves. The anti-icing control accessories use bleed air to externally purge the jet precooling control device and other accessories to prevent surface icing. After the jet precooling stops working, the anti-freezing control accessories use bleed air to purge the water in the pipeline from the outlet of the three zones of the jet precooling control device to the jet precooling nozzle. Before entering the low-temperature environment, the water in the pipeline is purged in advance, thereby preventing the water in the pipeline from freezing. This not only reduces the risk of freezing during flight, but also simplifies the storage and maintenance requirements for troops after landing. It expands the scope of domestic jet precooling applications that can be equipped with troops, and allows the aircraft to continue to fly safely and with high maneuverability under extremely cold and extreme northern conditions. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a preferred embodiment of the jet precooling water supply antifreeze architecture of this application;

[0032] Figure 2Schematic diagram of a jet precooling water pump;

[0033] Figure 3 Cross-sectional view of a jet precooling water pump;

[0034] Figure 4 3D view of a jet precooling water pump. Detailed Implementation

[0035] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings. Other related parts can be referred to the general design. In the absence of conflict, the embodiments and technical features in the embodiments of this application can be combined with each other to obtain new embodiments.

[0036] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer," etc., used in this application description to indicate relative direction or positional relationship are used only to indicate relative orientation or positional relationship, and do not imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, and therefore should not be construed as a limitation on this application. The terms "first," "second," "third," and similar terms used in this application description are used only for descriptive purposes to distinguish different components, and should not be construed as indicating or implying relative importance. The terms "a," "one," or "the," etc., used in this application description should not be construed as an absolute limitation on quantity, but should be construed as indicating the existence of at least one. The terms "including," "comprising," etc., used in this application description mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0037] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0038] like Figure 1 As shown, to solve the above problems, this application provides a low-power extraction jet precooling control system, comprising:

[0039] Water source;

[0040] Water pump; pumps water from the water source to the jet precooling control device;

[0041] The jet precooling control device has a metering valve, and a sensing device connected to the jet precooling controller is installed on the metering valve. The sensing device senses the working parameters of the metering valve.

[0042] The jet pre-cooling injection device sprays water from the jet pre-cooling control device onto the air intake duct;

[0043] The jet precooling controller generates control current for the metering valve and control current for the water pump based on the sensing devices of the metering valve and the sensing device installed at the engine inlet. The jet precooling control device consists of three parts: a first metering mechanism, a second metering mechanism, and a third metering mechanism. The three metering mechanisms are identical, each consisting of a metering valve, an outlet shut-off valve, and an electro-hydraulic servo valve. The three metering mechanisms are connected in parallel. The high-pressure water medium after the pump passes through the metering valves of the three metering mechanisms. When the electronic controller issues a command to control the electro-hydraulic servo valve to open the metering valve, the water medium passes through the metering valve and then opens the outlet shut-off valve to enter the jet injector.

[0044] The water supply of the three water control devices is controlled in a closed loop by the pressure difference before and after the extraction nozzle and the opening of the metering valve by the electronic controller. When the electronic controller receives the jet command, it issues a command to open the metering mechanism of one channel. The metering valve opens rapidly under the control of the electro-hydraulic servo valve. When the pressure difference before and after the nozzle reaches the pressure value set by the controller, the metering valve moves to the designated position, and the outlet water medium of one channel reaches the required target.

[0045] The anti-icing module includes an anti-icing control accessory, which introduces engine bleed air into the jet pre-cooling injection device and blows anti-icing air onto the icing location of the jet pre-cooling injection device.

[0046] The antifreeze module includes an antifreeze solenoid valve, which purges the easily frozen pipeline with gas from the aircraft gas cylinder; the metering valves include a first-zone metering valve, a second-zone metering valve, and a third-zone metering valve that run in parallel; the first-zone metering valve, the second-zone metering valve, and the third-zone metering valve supply water to the jet precooling injection device individually or simultaneously.

[0047] In some alternative methods, the metering valve sensing device includes a displacement sensor for measuring the opening of the metering valve and a pressure sensor for measuring the outlet pressure of the metering valve.

[0048] The water supply device includes: an aircraft pump, a high-pressure water pump, a solenoid valve, a flow control valve, and a return pipeline;

[0049] Aircraft pumps are used to extract water from water sources.

[0050] Solenoid valve, used to control flow rate and control valves;

[0051] High-pressure water pumps pressurize the water pumped by the aircraft and supply it to the jet precooling injection device;

[0052] The return pipeline connects the outlet of the high-pressure water pump to the water source;

[0053] Flow control valves are connected to the high-pressure water pump and the aircraft pump, respectively.

[0054] Specifically:

[0055] The flow control valve, based on the on / off state of the solenoid valve, distributes water from the aircraft pump to the high-pressure water pump and the return pipeline in two modes.

[0056] Mode 1: When the solenoid valve is de-energized, the flow control valve reduces the flow rate of the aircraft pump through the high-pressure water pump. The water pressure at the outlet of the high-pressure water pump is less than the opening threshold of the inlet of the jet pre-cooling injection device, and the water at the outlet of the high-pressure water pump flows back to the water source through the return pipeline.

[0057] Mode 2: When the solenoid valve is energized, the flow control valve increases the flow rate of the aircraft pump through the high-pressure water pump. The water pressure at the outlet of the high-pressure water pump is greater than the opening threshold of the inlet of the jet precooling injection device. Part of the water at the outlet of the high-pressure water pump flows back to the water source through the return pipe, and part flows into the jet precooling injection device.

[0058] Preferably, such as Figure 2 As shown, the flow control valve includes a sleeve and a piston installed inside the sleeve. The piston includes a first piston 1 and a second piston 2. A first control chamber Z is formed between the first piston 1 and the second piston 2. A second control chamber Y is formed between the first piston 1 and the end face of the sleeve. A third control chamber X is formed between the second piston 2 and the end face of the sleeve. A first adjustable valve 3 is formed between the first piston 1 and the sleeve hole. A second adjustable valve 4 is formed between the second piston 2 and the sleeve hole.

[0059] The high-pressure water pump includes a first pump chamber and a second pump chamber. The water at the pump outlet is a first pressure water a. After passing through the first pump chamber, the first pressure water a forms a second pressure water b. The second pressure water b passes through the first adjustable valve 3 and enters the second pump chamber to form a third pressure water c. The third pressure water c is supplied to the jet pre-cooling injection device through the second adjustable valve 4. The first pressure water a is connected to the third control chamber X, and the second pressure water b is connected to the second control chamber Y. The opening and closing of the solenoid valve respectively connects the third control chamber X or the water tank pipeline to the first control chamber Z. The pressure difference between the third control chamber X and the first control chamber Z pushes the second piston 2 to move, thereby adjusting the opening of the second adjustable valve 4. The pressure difference between the second control chamber Y and the first control chamber Z pushes the first piston 1 to move, thereby adjusting the opening of the first adjustable valve 3.

[0060] Specifically: such as Figure 3 , Figure 4 As shown, the water pump pressurizes the incoming water to the test bench and provides water with a certain pressure and flow rate to the jet precooling control device. Sufficient flow rate and pressure of water are injected into the air intake according to the control plan. When the jet precooling is not spraying water, to prevent the water pump from running dry and experiencing wear and overheating, and considering the cooling and lubrication functions of the water-end bearing and mechanical seal, a centrifugal water pump is designed. When the jet precooling control device is closed, an ejector device is used to transport the high-temperature cooling water medium from the water pump into the water tank, achieving low-pressure water circulation and meeting the low-power usage requirements. This design consists of a two-stage pump connected in series. The rotor is supported by one ball bearing and one sliding bearing. The ball bearing is cooled and lubricated by lubricating oil supplied by the casing, while the sliding bearing is cooled and lubricated by water. A mechanical seal isolates the lubricating oil and water medium between the ball bearing and the pump chamber. When jet precooling is not required, the solenoid valve is de-energized, the control chamber of the flow control valve is connected to the low pressure of the water tank, the piston moves to the throttling position, the water pump runs at a small flow rate, and the output water returns to the water tank through the bypass of the control device, forming circulating water to cool the mechanical seal and sliding bearing on one side of the pump chamber. At the same time, the heat generated by the power consumption of the water pump prevents the inside of the jet cooling mechanism from freezing. In this state, the water pump flow rate is about 2000L / h, and the expected power is about 10KW. When jet precooling is required, the solenoid valve is energized, the control chamber of the flow control valve is connected to the high pressure of the pump outlet, the piston moves to the high flow position, the water pump outputs a large flow rate, which is supplied to the jet precooling nozzle through the control device.

[0061] In some alternative configurations, the sensing devices at the engine inlet include a temperature sensor and a pressure sensor housing circumferentially mounted at the engine inlet.

[0062] In some alternative implementations, the jet precooling controller is connected to a monitoring system that displays the operating status of the jet precooling controller.

[0063] Based on the aforementioned low-power extraction jet precooling control system, the pressure sensor box is used to characterize the inlet total pressure P2, and the engine inlet total temperature sensor is used to characterize the inlet total temperature T2. This information is provided to the jet precooling controller to achieve temperature closed-loop control. The jet precooling smooth control method based on temperature closed-loop control is as follows:

[0064] Step S1: Calculate the expected value T2_Dem of the engine inlet total temperature based on the aircraft Mach number.

[0065] Step S2: The deviation value Delta_T2 is obtained by subtracting the expected value T2_Dem from the total inlet temperature T2 collected by the engine inlet sensor.

[0066] Step S3: Calculate the target water flow rate Ww_dem based on the deviation value Delta_T2;

[0067] Step S4: Divide the target water flow rate Ww_dem into multiple zone flow rates, and supply water to multiple identical water supply zones according to the zone flow rates;

[0068] In step S4, the specific method for supplying water to the water supply zone according to the zone flow rate includes:

[0069] Step S41: The difference between the zone flow rate and the feedback value of the first sensor at the outlet is used to obtain the mid-loop control deviation;

[0070] Step S42: Calculate the middle loop control target by using the PID algorithm to obtain the middle loop control deviation; calculate the difference between the middle loop control target and the feedback value of the second sensor at the outlet to obtain the inner loop control deviation; calculate the inner loop control target by using the PID algorithm to obtain the inner loop control deviation.

[0071] Step S43: Control the current input of the electro-hydraulic servo valve by controlling the target through the inner loop, and control the opening of the outlet metering valve by controlling the current input, thereby controlling the outlet water flow.

[0072] Preferably, the water pump includes: an aircraft pump driven by an electric motor, a high-pressure water pump for increasing water pressure, and a water filter located between the aircraft pump and the high-pressure water pump.

[0073] This application employs anti-icing control accessories and anti-freezing solenoid valves for jet precooling water supply. The anti-icing control accessories use bleed air to externally purge the jet precooling control device and other accessories to prevent surface icing. After jet precooling stops working, the anti-freezing control accessories use bleed air to purge the water in the pipeline from the outlet of the three zones of the jet precooling control device to the jet precooling nozzle. Before entering the low-temperature environment, the water in the pipeline is purged in advance, thereby preventing the water in the pipeline from freezing. This not only reduces the risk of freezing during flight but also simplifies the storage and maintenance requirements for troops after landing. It expands the scope of domestic jet precooling applications that can be equipped with troops, allowing aircraft to continue to fly safely and with high maneuverability even in extremely cold and northern conditions.

[0074] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A low-power extracted jet precooling control system, characterized in that, include: Water source; Water supply equipment; The water from the water source is pumped to the jet precooling control device; The jet precooling control device has a metering valve, and a sensing device connected to the jet precooling controller is installed on the metering valve. The sensing device senses the working parameters of the metering valve. The jet pre-cooling injection device sprays water from the jet pre-cooling control device onto the air intake duct; The jet precooling controller generates a control current for controlling the metering valve and a control current for controlling the high-pressure water pump based on the sensing device of the metering valve and the sensing device installed at the engine inlet. The anti-icing module includes an anti-icing control accessory, which introduces engine bleed air into the jet pre-cooling injection device and blows anti-icing air onto the icing location of the jet pre-cooling injection device. The antifreeze module includes an antifreeze solenoid valve, which purges the easily frozen pipelines with gas from the aircraft gas cylinder. The water supply device includes: an aircraft pump, a high-pressure water pump, a solenoid valve, a flow control valve, and a return pipeline; Aircraft pumps are used to extract water from water sources. Solenoid valve, used to control flow rate and control valves; High-pressure water pumps pressurize the water pumped by the aircraft and supply it to the jet precooling injection device; The return pipeline connects the outlet of the high-pressure water pump to the water source; Flow control valves are connected to the high-pressure water pump and the aircraft pump, respectively. Among them, the flow control valve distributes water from the aircraft pump to the high-pressure water pump and the return pipeline in two modes based on the on / off state of the solenoid valve. Mode 1: When the solenoid valve is de-energized, the flow control valve reduces the flow rate of the aircraft pump through the high-pressure water pump. The water pressure at the outlet of the high-pressure water pump is less than the opening threshold of the inlet of the jet pre-cooling injection device, and the water at the outlet of the high-pressure water pump flows back to the water source through the return pipeline. Mode 2: When the solenoid valve is energized, the flow control valve increases the flow rate of the aircraft pump through the high-pressure water pump. The water pressure at the outlet of the high-pressure water pump is greater than the opening threshold of the inlet of the jet precooling injection device. Part of the water at the outlet of the high-pressure water pump flows back to the water source through the return pipe, and part flows into the jet precooling injection device.

2. The low-power extraction jet precooling control system as described in claim 1, characterized in that, The flow control valve includes a sleeve and a piston installed in the sleeve. The piston includes a first piston (1) and a second piston (2). A first control chamber (Z) is formed between the first piston (1) and the second piston (2). A second control chamber (Y) is formed between the first piston (1) and the end face of the sleeve. A third control chamber (X) is formed between the second piston (2) and the end face of the sleeve. A first adjustable valve (3) is formed between the first piston (1) and the sleeve hole. A second adjustable valve (4) is formed between the second piston (2) and the sleeve hole. The high-pressure water pump includes a first pump chamber and a second pump chamber. The water at the outlet of the aircraft pump is the first pressure water (a). The first pressure water (a) passes through the first pump chamber to form the second pressure water (b). The second pressure water (b) passes through the first adjustable valve (3) and enters the second pump chamber to form the third pressure water (c). The third pressure water (c) is supplied to the jet precooling injection device through the second adjustable valve (4). The first pressure water (a) is connected to the third control chamber (X), and the second pressure water (b) is connected to the second control chamber (Y). The opening and closing of the solenoid valve respectively connects the third control chamber (X) or the water tank pipeline to the first control chamber (Z). The pressure difference between the third control chamber (X) and the first control chamber (Z) pushes the second piston (2) to move, thereby adjusting the opening of the second adjustable valve (4). The pressure difference between the second control chamber (Y) and the first control chamber (Z) pushes the first piston (1) to move, thereby adjusting the opening of the first adjustable valve (3).

3. The low-power extraction jet precooling control system as described in claim 1, characterized in that, The metering valves include a first-zone metering valve, a second-zone metering valve, and a third-zone metering valve that run in parallel with each other; the first-zone metering valve, the second-zone metering valve, and the third-zone metering valve supply water to the jet precooling injection device individually or simultaneously.

4. The low-power extraction jet precooling control system as described in claim 1, characterized in that, The metering valve sensing device includes a displacement sensor that measures the opening degree of the metering valve and a pressure sensor that measures the outlet pressure of the metering valve.

5. The low-power extraction jet precooling control system as described in claim 1, characterized in that, The sensing devices at the engine inlet include a temperature sensor and a pressure sensor box that are circumferentially mounted at the engine inlet.

6. The low-power extraction jet precooling control system as described in claim 1, characterized in that, The jet precooling controller is connected to a monitoring system, which displays the working status of the jet precooling controller.

7. The low-power extraction jet precooling control system as described in claim 1, characterized in that, The metering valve is equipped with a water supply cut-off valve, and the emergency water supply cut-off function is achieved through the water supply cut-off valve by the command of the jet precooling controller.

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