CN114320612B - Engine outer duct backflow control method and device, engine and aircraft - Google Patents
Engine outer duct backflow control method and device, engine and aircraft Download PDFInfo
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Abstract
The disclosure provides a backflow control method and device for an outer duct of an engine, the engine and an aircraft. The method for controlling the backflow of the outer duct of the engine is suitable for a variable-cycle engine and comprises the following steps: acquiring working state parameters of the engine when a mode selection valve of the engine is in a non-closing state; determining the backflow margin of the engine according to the working state parameters, wherein the physical meaning of the backflow margin is the distance between the matching pressure ratio of the actual core machine driving fan of the engine and the pressure ratio of the theoretical backflow critical core machine driving fan; and judging the flow state of the outer duct of the engine and controlling the backflow according to the size of the backflow margin.
Description
Technical Field
The disclosure relates to the technical field of aircraft engines, in particular to an engine outer duct backflow control method and device, an engine and an aircraft.
Background
The variable cycle engine adopts multi-duct pneumatic layout, can effectively widen the working envelope of the engine, is suitable for the performance requirements under different task conditions, and is an ideal power device of a future fighter. Large adjustments of the bypass ratio are typical features of variable cycle engines. In the working process of the engine, once the matching state of the compression system is unreasonable, the second outer duct easily flows backwards. The complex duct geometry and the strong duct-component coupling effect in the compression system bring a serious challenge to the judgment of the duct working state and the duct matching adjustment.
Disclosure of Invention
In view of the problems in the prior art, embodiments of the present disclosure provide a backflow control method and device for an outer duct of an engine, and an aircraft, so as to determine and control backflow of an outer duct of a compression system in a working process of a variable cycle engine.
On one hand, some embodiments of the present disclosure provide a backflow control method for an engine external duct, which is applicable to a variable cycle engine, and the backflow control method for the engine external duct includes:
acquiring working state parameters of the engine when a mode selection valve of the engine is in a non-closed state;
determining the backflow margin of the engine according to the working state parameters, wherein the physical meaning of the backflow margin is the distance between the matching pressure ratio of the actual core machine driving fan of the engine and the pressure ratio of the theoretical backflow critical core machine driving fan; and the number of the first and second groups,
and judging the flow state of the outer duct of the engine and controlling the backflow according to the size of the backflow margin.
In at least one embodiment of the present disclosure, an engine includes a compression system comprising: the device comprises a fan, a core machine driving fan, a high-pressure compressor and a front variable-area duct ejector;
the working state parameters comprise: the inlet total pressure of the engine is moderate, the inlet total pressure of the engine, the pressure ratio and efficiency of the fan, the flow, the pressure ratio and efficiency of the core machine driving fan, the flow of the high-pressure air compressor and the outlet area of the first outer duct at the front variable-area duct ejector are improved.
In at least one embodiment of the present disclosure, determining a backflow margin of an engine according to an operating condition parameter includes:
acquiring the pressure ratio of a backflow critical core machine driving fan and/or the opening degree of a backflow critical front variable-area duct ejector according to the working state parameters;
according to the pressure ratio of the backflow critical core machine driving fan, backflow margin is obtained, and the backflow margin meets the requirement
In the formula (I), the compound is shown in the specification,RMin order to obtain a backflow margin,π cr the pressure ratio of the fan is driven by the reverse flow critical core machine,π CDFS is the pressure ratio of the core driving fan.
In at least one embodiment of the present disclosure, obtaining a pressure ratio of a backflow critical core machine driving fan according to a working state parameter includes:
obtaining a first relation according to the total pressure of the characteristic section of the variable-area bypass ejector in front of the outlet of the first bypass being equal to the total pressure of the outlet of the core-driven fan, while ignoring radial non-uniformity of flow and flow losses of the first bypass:
obtaining a second relation according to the fact that the total temperature of the characteristic section of the variable-area ducted ejector in front of the outlet of the first outer duct is equal to the total temperature of the outlet of the core machine driven fan:
according to the static pressure of the confluence section of the first outer duct at the outlet of the front variable-area duct ejector and the static pressure of the confluence section of the two outer ducts at the outlet of the front variable-area duct ejector, a third relational expression is obtained:
obtaining a fourth relational expression according to the flow conservation relation satisfied by the flow of the first outer duct:
under a theoretical backflow critical state, the flow of the second outer duct is zero, fluid in the second outer duct is stagnant, and a fifth relational expression is obtained according to the fact that the static pressure of the confluence section of the second outer duct at the outlet of the front variable-area duct ejector is equal to the total pressure of the outlet of the fan:
obtaining a sixth relational expression according to a flow equation satisfied by the flow of the first bypass:
under the backflow critical state, establishing a first relation to a sixth relation in a simultaneous manner on the assumption that the opening degree of the front variable-area bypass ejector is the obtained actual opening degree of the front variable-area bypass ejector, and obtaining the pressure ratio of the driving fan of the backflow critical core machine;
in the formula (I), the compound is shown in the specification,p 0 * is the total inlet pressure of the engine;
p BPS1 * the total pressure is the total pressure of the characteristic section of a first outer duct at the outlet of the front variable-area duct ejector;
p BPS1 static pressure of a confluence section of a first outer duct at the outlet of the front variable-area duct ejector;
p BPS2 static pressure of a confluence section of a second outer duct at the outlet of the front variable-area duct ejector;
T 0 * is the inlet total pressure of the engine;
T PBS1 * the total temperature of the characteristic section of a first external duct at the outlet of the front variable-area duct ejector is the total temperature;
π FAN is the pressure ratio of the fan;
η FAN is the efficiency of the fan;
m CDFS the flow of the fan is driven by the core machine;
π CDFS the pressure ratio of the fan driven by the core machine;
η CDFS efficiency of the core driving fan;
m HPC the flow rate of the high-pressure compressor;
m BPS1 is the flow of the first bypass;
Ksatisfy the requirement of
Wherein R is a gas constant;
kis the specific heat ratio;
A BPSI is the area of the outlet of the first external duct at the position of the front variable-area duct ejector.
In at least one embodiment of this disclosure, according to operating condition parameter, obtain the critical preceding variable area duct ejector aperture of refluence, include:
obtaining a first relation according to the total pressure of the characteristic section of the variable-area bypass ejector in front of the outlet of the first bypass being equal to the total pressure of the outlet of the core-driven fan, while ignoring radial non-uniformity of flow and flow losses of the first bypass:
obtaining a second relation according to the fact that the total temperature of the characteristic section of the variable-area ducted ejector in front of the outlet of the first outer duct is equal to the total temperature of the outlet of the core machine driving fan:
according to the static pressure of the confluence section of the first outer duct at the outlet of the front variable-area duct ejector and the static pressure of the confluence section of the two outer ducts at the outlet of the front variable-area duct ejector, a third relational expression is obtained:
obtaining a fourth relational expression according to the flow conservation relation satisfied by the flow of the first outer duct:
under a theoretical backflow critical state, the flow of the second outer duct is zero, fluid in the second outer duct is stagnant, and a fifth relational expression is obtained according to the fact that the static pressure of the confluence section of the second outer duct at the outlet of the front variable-area duct ejector is equal to the total pressure of the outlet of the fan:
obtaining a sixth relational expression according to a flow equation satisfied by the flow of the first bypass:
under the backflow critical state, a first relation to a sixth relation are established in a simultaneous manner on the assumption that the pressure ratio of the core machine driving fan is the obtained actual core machine driving fan matching pressure ratio, and the theoretical backflow critical first culvert outlet area is obtained;
taking the opening degree of the front variable-area culvert ejector corresponding to the theoretical backflow critical first culvert outlet area as the opening degree of the backflow critical front variable-area culvert ejector;
in the formula (I), the compound is shown in the specification,p 0 * is the total inlet pressure of the engine;
p BPS1 * the total pressure of the characteristic section of a first outer duct at the outlet of the front variable-area duct ejector is obtained;
p BPS1 static pressure of a confluence section of a first outer duct at the outlet of the front variable-area duct ejector;
p BPS2 is a front variable area bypass ejector outletStatic pressure of a converging section of the second outer duct;
T 0 * is the total inlet pressure of the engine;
T PBS1 * the total temperature of the characteristic section of a first external duct at the outlet of the front variable-area duct ejector is the total temperature;
π FAN is the pressure ratio of the fan;
η FAN is the efficiency of the fan;
m CDFS the flow of the fan is driven by the core machine;
π CDFS the pressure ratio of the fan driven by the core machine;
η CDFS efficiency of the core driving fan;
m HPC the flow rate of the high-pressure compressor;
m BPS1 is the flow of the first bypass;
Ksatisfy the requirement of
Wherein R is a gas constant;
kis the specific heat ratio;
A BPSI is the area of the outlet of the first external duct at the position of the front variable-area duct ejector.
In at least one embodiment of the present disclosure, the determining and backflow controlling a flow state of an engine bypass according to a size of a backflow margin includes:
when the backflow margin is larger than 0, no backflow occurs in an outer duct of the engine;
when the backflow margin is equal to 0, corresponding to the critical state of backflow of the outer duct, the pressure ratio of the core machine driving fan is prevented from being improved, and/or the opening degree of the front variable-area duct ejector is prevented from being increased, so that backflow is prevented;
when the backflow margin is smaller than 0, backflow occurs in an outer duct of the engine, the opening degree of a front variable-area duct ejector of the engine is reduced, and/or the pressure ratio of a core machine driving fan is reduced until the backflow margin is larger than 0.
In another aspect, some embodiments of the present disclosure further provide an engine outer duct backflow control device, including:
an acquisition module configured to: acquiring working state parameters of the engine when a mode selection valve of the engine is in a non-closing state;
a backflow margin determination module connected to the acquisition module and configured to: determining the backflow margin of the engine; the physical meaning of the backflow margin is the distance between the matching pressure ratio of the actual core machine driving fan of the engine and the pressure ratio of the theoretical backflow critical core machine driving fan;
the judgment and control module is connected with the backflow margin determination module and is configured to: and judging the flow state of the outer duct of the engine and controlling the backflow according to the size of the backflow margin.
In yet another aspect, some embodiments of the present disclosure also provide a computer-readable storage medium having stored therein computer program instructions that, when executed by a processor of a user device, cause the user device to perform the engine-out duct backflow control method of any one of claims 1-6.
In another aspect, some embodiments of the present disclosure further provide an engine, including the engine overblow backflow control device of any of the above embodiments.
In another aspect, some embodiments of the present disclosure further provide an aircraft including the engine overblow control device of any of the above embodiments, or the engine of any of the above embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
FIG. 1 is a schematic view of an external duct backflow phenomenon during the operation of an engine;
fig. 2 is a flow chart of an engine overboard duct backflow control method according to some embodiments.
Reference numerals:
the method comprises the following steps of 1-a fan, 2-a core machine driving fan, 3-a high-pressure compressor, 4-a first outer duct, 5-a second outer duct, 6-a mode selection valve and 7-a front variable area duct ejector.
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant matter and not restrictive of the disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Corresponding features and advantages of the apparatus and method may be inter-referenced to avoid redundancy of description.
It should be noted that, the step numbers in the text are only for convenience of explanation of the specific embodiments, and do not serve to limit the execution order of the steps.
The method provided by some embodiments of the present disclosure may be executed by a relevant processor, and the processor is taken as an example as an execution subject in the following description. The execution subject can be adjusted according to a specific case, such as a server, an electronic device, a computer, and the like.
The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in FIG. 1, some embodiments of the present disclosure provide an engine including a compression system and a bypass adjustment member. The compression system includes a compression component, such as a fan 1, a Core driven fan 2 (CDFS) and a high pressure compressor 3, which are coaxially disposed. The bypass regulating means includes a Mode selector Valve 6 (MSV) and a Forward variable area bypass ejector 7 (FVABI).
The outer duct of the engine comprises two ducts, namely a second outer duct 5 positioned behind the fan 1 and a first outer duct 4 positioned behind the core engine driving fan 2, and the engine can work in a single-duct mode and a double-duct mode. The mode selection valve 6 is positioned at the inlet of the second bypass 5 of the engine and can adjust the inlet area of the second bypass 5. In the single bypass mode, the mode selection valve 6 is closed, the flow of the second bypass is zero, and the total bypass of the engine is small; under the double-bypass mode, the mode selection valve 6 is opened, and the total bypass of the engine is larger. The front variable-area bypass ejector 7 is located in the confluence area of the first outer bypass 4 and the outlets of the two outer bypasses, and the confluence process of the two outer bypasses is controlled by adjusting the area ratio of the first outer bypass 4 to the outlets of the two outer bypasses.
As the core machine drives the fan 2 to do work and pressurize, the total pressure of the fluid in the first outer duct 4 of the engine is higher than that of the fluid in the second outer duct 5, once the matching state of the compression part in the compression system is unreasonable, the second outer duct 5 is easy to backflow (as shown by a dotted coil part in figure 1), so that the fluid in the outer duct enters the content of the engine again, the overall matching of the engine is influenced, and the performance advantage of the variable cycle engine is lost.
In the related art, when the variable cycle engine is subjected to matching analysis, the size relationship between the static pressure at the inlet of the mode selection valve 6 and the static pressure at the outlet of the front variable area bypass ejector 7 is usually adopted to judge whether the second outer bypass 5 generates backflow. On the one hand, however, the flow direction is not strict pneumatically by using the magnitude relation of static pressures of the inlet and the outlet of the pipeline; on the other hand, during the operation of a real engine, the extraction of static pressure is relatively difficult, and the matching operation states (flow rate, pressure ratio, efficiency and the like) of components are parameters which are relatively easy to obtain.
Based on the above, some embodiments of the present disclosure provide an engine bypass backflow control method, which is suitable for a variable cycle engine. As shown in FIG. 2, the engine bypass backflow control method comprises S1-S3.
S1, obtaining the operating state parameters of the engine when the mode selection valve 6 is in the non-closed state.
In some embodiments, the operating state parameters include: the inlet total pressure of the engine, the inlet total pressure of the fan 1, the pressure ratio and efficiency of the fan, the flow, pressure ratio and efficiency of the core machine driving fan 2, the flow of the high-pressure compressor 3 and the outlet area of the first outer duct at the front variable-area duct ejector 7. The working state parameters are used as basic state parameters of the engine and are output in real time in the working process of the engine, and the parameters are convenient and easy to read.
And S2, determining the backflow margin of the engine according to the working state parameters.
Optionally, the step S2 includes S21~ S22.
And S21, acquiring the pressure ratio of the backflow critical core machine driving fan and/or the opening degree of the backflow critical front variable-area bypass ejector according to the working state parameters.
And S22, obtaining the backflow margin according to the backflow critical core machine driving fan pressure ratio.
The pressure ratio of the backflow critical core machine driving fan and the opening degree of the variable-area ducted ejector before backflow critical are different reflection forms of the same physical state, and the two are in one-to-one correspondence. In the backflow critical state, a backflow critical core machine driving fan pressure ratio can be deduced, and the backflow margin can be calculated according to the backflow critical core machine driving fan pressure ratio. Or the opening degree of a backflow critical front variable-area bypass ejector can be deduced, and the backflow margin is calculated according to the opening degree of the backflow critical front variable-area bypass ejector.
Here, the backflow margin is obtained based on the backflow critical core driving fan pressure ratio as an example.
The backflow margin is used for describing the flow state of the bypass of the variable-cycle compression system. The backflow margin is the judgment basis of backflow of the external duct of the compression system. The backflow margin is related to the actual core machine driving fan pressure ratio of the engine and the theoretical backflow critical core machine driving fan pressure ratio. The physical meaning of the backflow margin is the distance between the actual core machine driving fan matching pressure ratio of the engine and the theoretical backflow critical core machine driving fan pressure ratio, and the backflow margin is calculated by the following formula:
in the formula (I), the compound is shown in the specification,RMin order to obtain a backflow margin,π cr the pressure ratio of the fan is driven by the reverse flow critical core machine,π CDFS is the pressure ratio of the core driving fan.
In some embodiments, regarding the obtaining of the pressure ratio of the backflow critical core machine driving fan and/or the opening degree of the backflow critical front variable-area bypass ejector in step S21, the flow state of the bypass is divided into two types, i.e., backflow and non-backflow, by taking the state that the flow rate of the second bypass is zero as a boundary. For any engine working state, when other matching parameters of the compression system are not changed, the pressure ratio of the driving fan of the theoretical critical core engine existsπ cr And the opening degree of the theoretical critical front variable area culvert injectorA cr 。
Based on the pressure ratio, the pressure ratio of the drive fan of the backflow critical core machine and the opening degree of the variable-area duct ejector before backflow critical can be obtained.
Obtaining a first relation according to the total pressure of the characteristic section of the variable-area bypass ejector in front of the outlet of the first bypass being equal to the total pressure of the outlet of the core-driven fan, while ignoring radial non-uniformity of flow and flow losses of the first bypass:
obtaining a second relation according to the fact that the total temperature of the characteristic section of the variable-area ducted ejector in front of the outlet of the first outer duct is equal to the total temperature of the outlet of the core machine driving fan:
according to the static pressure of the confluence section of the first outer duct at the outlet of the front variable-area duct ejector and the static pressure of the confluence section of the two outer ducts at the outlet of the front variable-area duct ejector, a third relational expression is obtained:
obtaining a fourth relational expression according to the flow conservation relation satisfied by the flow of the first outer duct:
under a theoretical backflow critical state, the flow of the second outer duct is zero, fluid in the second outer duct is stagnant, and a fifth relational expression is obtained according to the fact that the static pressure of the confluence section of the second outer duct at the outlet of the front variable-area duct ejector is equal to the total pressure of the outlet of the fan:
obtaining a sixth relational expression according to a flow equation satisfied by the flow of the first bypass:
in the formula (I), the compound is shown in the specification,p 0 * is the total inlet pressure of the engine;
p BPS1 * is a first outer channel of the front variable area culvert ejector outletTotal pressure of the characteristic section of the duct;
p BPS1 static pressure of a confluence section of a first outer duct at the outlet of the front variable-area duct ejector;
p BPS2 static pressure of a confluence section of a second outer duct at the outlet of the front variable-area duct ejector;
T 0 * is the total inlet pressure of the engine;
T PBS1 * the total temperature of the characteristic section of a first external duct at the outlet of the front variable-area duct ejector is the total temperature;
π FAN is the pressure ratio of the fan;
η FAN is the efficiency of the fan;
m CDFS the flow of the fan is driven by the core machine;
π CDFS the pressure ratio of the fan driven by the core machine;
η CDFS efficiency of the core driving fan;
m HPC the flow rate of the high-pressure compressor;
m BPS1 is the flow of the first bypass;
Ksatisfy the requirements of
Wherein R is a gas constant;
kis the specific heat ratio;
A BPSI is the area of the outlet of the first external duct at the position of the front variable-area duct ejector.
For the backflow critical state, there are two cases:
under the condition of the first backflow critical state, assuming that the opening degree of the front variable-area bypass ejector is the acquired actual opening degree of the front variable-area bypass ejector, establishing a first relation to a sixth relation in a simultaneous manner to acquire the pressure ratio of the backflow critical core machine driving fan, and using the pressure ratioπ cr It is shown that,π cr the highest core machine driving fan pressure ratio is ensured not to generate backflow.
Under the condition of a backflow critical state, simultaneously establishing a first relation to a sixth relation on the assumption that the pressure ratio of the core machine driving fan is the obtained actual core machine driving fan matching pressure ratio to obtain the theoretical backflow critical first culvert outlet area; taking the opening degree of the front variable-area culvert ejector corresponding to the critical first culvert outlet area of the theoretical backflow as the opening degree of the backflow critical front variable-area culvert ejectorA cr It is shown that,A cr the opening degree of the maximum front variable-area culvert injector is ensured to avoid backflow.
And S3, judging the flowing state of the bypass of the engine and controlling the backflow according to the size of the backflow margin.
In some embodiments, step S3 includes:
when the backflow margin is larger than 0, no backflow occurs in an outer duct of the engine;
when the backflow margin is equal to 0, corresponding to the critical state of backflow of the outer duct, in order to prevent backflow, the pressure ratio of the core machine driving fan is prevented from being continuously increased, and/or the opening degree of the front variable-area duct ejector is prevented from being increased;
when the backflow margin is smaller than 0, backflow occurs in an outer duct of the engine, the opening degree of a front variable-area duct ejector of the engine is reduced, and/or the pressure ratio of a core machine driving fan is reduced until the backflow margin is larger than 0, so that the backflow is eliminated. In actual operation, if the outer duct flows backwards, the control parameters of the engine can be gradually adjustedMonitoring the backflow margin value in real time until the backflow margin value is reachedRM>0, the backflow is completely eliminated. This method is an effective means for suppressing the reverse flow of the outer duct.
According to the backflow control method for the external duct of the engine provided by some embodiments of the disclosure, the flowing state of the engine duct is associated with the performance parameters of relevant components of the compression system, a simple and easy-to-use external duct backflow criterion is provided, a backflow inhibition method for the external duct is provided according to the coupled flowing mechanism of the duct and the components, backflow of the external duct of the compression system in the working process of the variable-cycle engine can be effectively judged and controlled, and the backflow control method has important significance for the matching design of the variable-cycle engine.
Some embodiments of the present disclosure further provide an engine external duct backflow control device, which includes an acquisition module, a backflow margin determination module connected to the acquisition module, and a judgment and control module connected to the backflow margin determination module.
The acquisition module is configured to: the operating state parameters of the engine when the mode selection valve 6 of the engine is in a non-closed state are obtained.
The backflow margin determination module is configured to: determining the backflow margin of the engine; the physical meaning of the backflow margin is the distance between the actual core machine driving fan matching pressure ratio of the engine and the theoretical backflow critical core machine driving fan pressure ratio.
The determination and control module is configured to: and judging and controlling the flow state of an outer duct of the engine according to the size of the backflow margin.
The embodiment of the disclosure also provides a backflow control device for the outer duct of the engine, which is used for judging and controlling the backflow of the outer duct of the engine. Wherein the memory has stored therein computer program instructions adapted to be executed by the processor. When the computer program instructions are executed by the processor, the processor executes the engine extraductal backflow control method provided by any one of the above embodiments.
It should be noted that, when the engine outer duct backflow control device provided in the above embodiment is used to judge and control backflow of the engine outer duct, only the division of the above functional modules is illustrated, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure or program of the device may be divided into different functional modules to complete all or part of the above described functions. In addition, the apparatus and method embodiments provided by the above embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments for details, which are not described herein again.
Some embodiments of the present disclosure also provide a computer-readable storage medium, in which computer program instructions are stored, and when the computer program instructions are executed by a processor of a user equipment, the user equipment is caused to execute the engine-outside duct backflow control method of any of the above embodiments.
Computer-readable storage media provided by any embodiment of the present disclosure include permanent and non-permanent, removable and non-removable media, and information storage may be implemented by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.
The embodiment of the present disclosure further provides an electronic device, which includes a processor and a memory, where the memory stores computer program instructions suitable for the processor to execute, and the computer program instructions are executed by the processor to perform the method disclosed in any of the above embodiments.
The electronic device provided by any embodiment of the present disclosure may be a mobile phone, a computer, a tablet computer, a server, a network device, or may also be a usb disk, a removable hard disk, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
For example, the electronic device may include: a processor, a memory, an input/output interface, a communication interface, and a bus. Wherein the processor, the memory, the input/output interface and the communication interface are communicatively connected to each other within the device by a bus.
The processor may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits, and is configured to execute a relevant program to implement the technical solutions provided in the embodiments of the present specification.
The Memory may be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, or the like. The memory may store an operating system and other application programs, and when the technical solution provided by the embodiments of the present specification is implemented by software or firmware, the relevant program codes are stored in the memory and called by the processor to be executed.
The input/output interface is used for connecting the input/output module to realize information input and output. The input/output/modules may be configured in the device as components or may be external to the device to provide corresponding functionality. The input devices may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output devices may include a display, a speaker, a vibrator, an indicator light, etc.
The communication interface is used for connecting the communication module so as to realize the communication interaction between the equipment and other equipment. The communication module can realize communication in a wired mode (for example, USB, network cable, etc.), and can also realize communication in a wireless mode (for example, mobile network, WIFI, bluetooth, etc.).
A bus includes a path that transfers information between the various components of the device, such as the processor, memory, input/output interfaces, and communication interfaces.
It should be noted that although the above-described device only shows a processor, a memory, an input/output interface, a communication interface and a bus, in a specific implementation, the device may also include other components necessary for normal operation. In addition, those skilled in the art will appreciate that the above-described apparatus may also include only the components necessary to implement the embodiments of the present disclosure, and not necessarily all of the components described.
From the above description of the embodiments, it is clear to those skilled in the art that the embodiments of the present disclosure can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the embodiments of the present specification may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments of the present specification.
The methods or modules illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. A typical implementation device is a computer, which may take the form of a personal computer, laptop computer, cellular telephone, camera phone, smart phone, personal digital assistant, media player, navigation device, email messaging device, game console, tablet computer, wearable device, or a combination of any of these devices.
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from other embodiments. The above-described method embodiments are merely illustrative, and the modules described as separate components may or may not be physically separate, and the functions of the modules may be implemented in one or more software and/or hardware when implementing the embodiments of the present disclosure. And part or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Some embodiments of the present disclosure further provide an engine, including the engine bypass backflow control device of any one of the above embodiments.
Some embodiments of the present disclosure further provide an aircraft including the engine overboard duct backflow control device of any of the above embodiments, or an engine including any of the above embodiments.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. Meanwhile, in the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection or electrical connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (5)
1. The backflow control method of the engine outer duct is applicable to a variable cycle engine, and is characterized by comprising the following steps:
acquiring working state parameters of the engine when a mode selection valve of the engine is in a non-closed state;
determining a backflow margin of the engine according to the working state parameters, wherein the physical meaning of the backflow margin is the distance between the actual core machine driving fan matching pressure ratio of the engine and the theoretical backflow critical core machine driving fan pressure ratio; and (c) a second step of,
judging and controlling the flow state of an outer duct of the engine in a backflow mode according to the size of the backflow margin;
the engine includes a compression system comprising: the device comprises a fan, a core machine driving fan, a high-pressure compressor and a front variable-area duct ejector;
the working state parameters include: the inlet total temperature of the engine is equal to the inlet total pressure of the engine, the pressure ratio and efficiency of the fan, the flow, pressure ratio and efficiency of the core engine driving fan, the flow of the high-pressure compressor, and the area of the first outer duct outlet at the front variable-area duct ejector;
the determining the backflow margin of the engine according to the working state parameters comprises the following steps:
acquiring the pressure ratio of a backflow critical core machine driving fan and/or the opening degree of a backflow critical front variable-area duct ejector according to the working state parameters;
obtaining the backflow margin according to the pressure ratio of the backflow critical core machine driving fan, wherein the backflow margin meets the requirement of the backflow margin
In the formula (I), the compound is shown in the specification,RMin order to provide a backflow margin,π cr the pressure ratio of the fan is driven by the critical core machine for backflow,π CDFS the pressure ratio of the fan driven by the core machine;
according to the operating condition parameter, obtain critical core machine drive fan pressure ratio of refluence and/or critical preceding variable area duct ejector aperture of refluence, include:
obtaining a first relation according to the total pressure of the characteristic section of the variable-area bypass ejector in front of the outlet of the first bypass being equal to the total pressure of the outlet of the core-driven fan, while ignoring radial non-uniformity of flow and flow losses of the first bypass:
obtaining a second relation according to the fact that the total temperature of the characteristic section of the variable-area ducted ejector in front of the outlet of the first outer duct is equal to the total temperature of the outlet of the core machine driving fan:
according to the static pressure of the confluence section of the first outer duct at the outlet of the front variable-area duct ejector and the static pressure of the confluence section of the two outer ducts at the outlet of the front variable-area duct ejector, a third relational expression is obtained:
according to the flow conservation relation satisfied by the flow of the first outer bypass, a fourth relational expression is obtained:
under a theoretical backflow critical state, the flow of the second outer duct is zero, fluid in the second outer duct is stagnant, and a fifth relational expression is obtained according to the fact that the static pressure of the confluence section of the second outer duct at the outlet of the front variable-area duct ejector is equal to the total pressure of the outlet of the fan:
according to a flow equation satisfied by the flow of the first outer duct, a sixth relational expression is obtained:
in the formula (I), the compound is shown in the specification,p 0 * is the total inlet pressure of the engine;
p BPS1 * the total pressure of the characteristic section of a first outer duct at the outlet of the front variable-area duct ejector is obtained;
p BPS1 static pressure of a confluence section of a first outer duct at the outlet of the front variable-area duct ejector;
p BPS2 static pressure of a confluence section of a second outer duct at the outlet of the front variable-area duct ejector;
T 0 * is the total inlet pressure of the engine;
T PBS1 * the total temperature of the characteristic section of a first outer duct at the outlet of the front variable-area duct ejector is measured;
π FAN is the pressure ratio of the fan;
η FAN is the efficiency of the fan;
m CDFS the flow of the fan is driven by the core machine;
π CDFS the pressure ratio of the fan driven by the core machine;
η CDFS efficiency of the core driving fan;
m HPC the flow rate of the high-pressure compressor;
m BPS1 is the flow of the first bypass;
Ksatisfy the requirement of
Wherein R is a gas constant;
kis the specific heat ratio;
A BPSI the area of a first outer duct outlet at the front variable area duct ejector is the area of a first outer duct outlet at the front variable area duct ejector;
under the backflow critical state, establishing a first relation to a sixth relation in a simultaneous manner on the assumption that the opening degree of the front variable-area bypass ejector is the obtained actual opening degree of the front variable-area bypass ejector, and obtaining the pressure ratio of the driving fan of the backflow critical core machine;
and/or under the backflow critical state, establishing a first relation to a sixth relation in a simultaneous manner on the assumption that the pressure ratio of the core machine driving fan is the obtained actual core machine driving fan matching pressure ratio, and obtaining the theoretical backflow critical first culvert outlet area; taking the opening degree of the front variable-area culvert ejector corresponding to the theoretical backflow critical first culvert outlet area as the opening degree of the backflow critical front variable-area culvert ejector;
the judging and backflow controlling the flowing state of the external duct of the engine according to the size of the backflow margin comprises the following steps:
when the backflow margin is larger than 0, no backflow occurs in an outer duct of the engine;
when the backflow margin is equal to 0, corresponding to the critical state of backflow of the outer duct, the pressure ratio of the core machine driving fan is prevented from being improved, and/or the opening degree of the front variable-area duct ejector is prevented from being increased, so that backflow is prevented;
when the backflow margin is smaller than 0, backflow occurs in an outer duct of the engine, the opening degree of a front variable-area duct ejector of the engine is reduced, and/or the pressure ratio of a core machine driving fan is reduced until the backflow margin is larger than 0.
2. An engine overbank backflow control device for performing the engine overbank backflow control method according to claim 1, characterized in that said engine overbank backflow control device comprises:
an acquisition module configured to: acquiring working state parameters of the engine when a mode selection valve of the engine is in a non-closed state;
a backflow margin determination module connected to the acquisition module and configured to: determining a backflow margin of the engine; the physical meaning of the backflow margin is the distance between the actual core machine driving fan matching pressure ratio of the engine and the theoretical backflow critical core machine driving fan pressure ratio;
the judgment and control module is connected with the backflow margin determination module and is configured to: and judging the flow state of the outer duct of the engine and controlling the backflow according to the size of the backflow margin.
3. A computer readable storage medium, characterized in that the storage medium has stored therein computer program instructions, which, when executed by a processor of a user device, cause the user device to execute the engine-out duct backflow control method as claimed in claim 1.
4. An engine comprising the engine overbank backflow control device of claim 2.
5. An aircraft, characterized by comprising an engine overboard duct backflow control device as claimed in claim 2, or comprising an engine as claimed in claim 4.
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| GB1503425A (en) * | 1976-08-04 | 1978-03-08 | Hallowell E | Gas turbine ducted fan jet engines for supersonic flight |
| US20110167784A1 (en) * | 2009-09-25 | 2011-07-14 | James Edward Johnson | Method of operating a convertible fan engine |
| WO2013141934A2 (en) * | 2011-12-30 | 2013-09-26 | United Technologies Corporation | Gas turbine engine with fan variable area nozzle |
| CN104019465B (en) * | 2014-05-29 | 2016-04-13 | 南京航空航天大学 | The super combustion chamber of turbine base combined cycle engine |
| CN111914365A (en) * | 2020-08-04 | 2020-11-10 | 南京航空航天大学 | Variable-cycle engine modeling method and variable-cycle engine component level model |
| CN113107708B (en) * | 2021-04-28 | 2022-06-10 | 中国航发沈阳发动机研究所 | Multi-culvert turbofan engine blending process balance equation modeling method |
| CN113482797B (en) * | 2021-08-18 | 2022-03-29 | 南京航空航天大学 | Tandem type TBCC engine modal conversion control method and device |
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