Combustion system based on longitudinal multi-stage sudden expansion structure and control method thereof

Abstract

The invention discloses a combustion system based on a longitudinal multi-stage sudden expansion structure and a control method thereof, and relates to the technical field of combustion control, the method comprises the following steps: obtaining fuel supply parameters, and determining a combustion state type corresponding to the fuel supply parameters; target characterization parameters of the combustion state and multiple combustion regulation and control modes corresponding to the target characterization parameters are determined; according to each combustion regulation and control mode, determining a plurality of combustion characteristic parameters matched with the target characteristic parameter from a preset multi-stage sudden expansion cavity database; determining candidate combustion sections associated with the plurality of combustion characteristic parameters; determining a target combustion section from the candidate combustion sections; and a regulation and control scheme corresponding to the combustion state is determined according to the target combustion section. Under the condition that the combustion state fluctuates, the regulation and control signal matched with the state can be output, more accurate combustion control is achieved, and therefore the combustion stability and energy efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of combustion control, and in particular to a combustion system based on a longitudinal multi-stage sudden expansion structure and a control method thereof. BACKGROUND

[0002] With the development of combustion devices towards high efficiency, low emission and multi-working condition adaptability, the stability control in the combustion process is particularly important. The existing combustion systems generally use fixed structures or single feedback signals for control, such as relying only on fuel flow, air equivalence ratio and other macro parameters to determine the combustion state, and adjusting the combustion working condition accordingly. However, the combustion process is essentially a complex process involving flow, heat transfer and acoustic coupling, and a single parameter cannot fully reflect the characteristics of the combustion state.

[0003] In related technologies, the combustion control method often judges the combustion stability through simple temperature detection or pressure detection, and performs rough regulation and control based on the judgment. However, this approach has significant limitations: on the one hand, it cannot effectively distinguish between stable combustion and different state types such as pulsating combustion, noise disturbance, etc.; on the other hand, it lacks multi-dimensional representation and combined use of combustion characteristics, resulting in a single control strategy that is difficult to adapt to complex changes in combustion state. Therefore, when the combustion state fluctuates or complex disturbances occur, the traditional control method cannot quickly and accurately output control instructions that match the current state, thereby affecting the stability and energy efficiency of the combustion process. SUMMARY

[0004] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] In view of the problems existing in the prior art, the present application is proposed.

[0006] To solve the above technical problems, the present application provides the following technical solutions: the method comprises the following steps: obtaining a fuel supply parameter, determining a combustion state type corresponding to the fuel supply parameter; According to the combustion state type, determining a target characteristic parameter of the combustion state, and a plurality of combustion control modes corresponding to the target characteristic parameter; According to each combustion control mode, determine a plurality of combustion characteristic parameters matched with the target characteristic parameter from a pre-set multi-stage sudden expansion cavity database; wherein the multi-stage sudden expansion cavity database comprises a plurality of combustion sections, each combustion section comprises characteristic information, and the characteristic information comprises combustion characteristic parameters under different modes; determining a candidate combustion section associated with the plurality of combustion characteristic parameters; determining a target combustion section from the candidate combustion section according to the fitting degree of each of the combustion characteristic parameters and the target characteristic parameter; determining a control scheme corresponding to the combustion state according to the target combustion section.

[0007] As a preferred scheme of the combustion control method based on the longitudinal multi-stage sudden expansion structure, the target characteristic parameter of the combustion state is determined according to the combustion state type, and the plurality of combustion control modes corresponding to the target characteristic parameter include: In the case where the combustion state type is a stable combustion working condition, the primary air ratio of the fuel supply parameter is extracted, and parameter encoding processing is performed to obtain a stable combustion characteristic parameter, and the stable combustion characteristic parameter is determined as the target characteristic parameter; The combustion control modes of the target characteristic parameter include a primary fuel flow rate control mode, an air staging control mode, and a cavity pressure feedback control mode.

[0008] As a preferred scheme of the combustion control method based on the longitudinal multi-stage sudden expansion structure, the target characteristic parameter of the combustion state is determined according to the combustion state type, and the plurality of combustion control modes corresponding to the target characteristic parameter include: In the case where the combustion state type is a pulsating combustion working condition, the fuel supply parameter exhibits periodic flow fluctuations, and if the flow fluctuation amplitude exceeds a preset threshold, dynamic feature extraction is performed on the fuel supply parameter to obtain a pulsating combustion characteristic parameter, and the pulsating combustion characteristic parameter is determined as the target characteristic parameter; The plurality of combustion control modes of the target characteristic parameter include a fuel pulsation suppression mode, an air ratio adjustment mode, and a cavity geometry coupling mode.

[0009] As a preferred scheme of the combustion control method based on the longitudinal multi-stage sudden expansion structure, the method further includes: if the pulsating combustion working condition is accompanied by sound pressure fluctuations, identifying the fluctuation type of the sound pressure fluctuations; In the case where the fluctuation type is a structured resonance, frequency spectrum summarization processing is performed on the sound pressure signal to obtain a combustion acoustics description parameter; Feature encoding processing is performed on the combustion acoustics description parameter to obtain an acoustics characteristic parameter; The pulsating combustion characteristic parameter and the acoustics characteristic parameter are determined as the target characteristic parameter of the combustion state; The combustion regulation mode of the target characterization parameter comprises a fuel pulsation suppression mode, an air ratio adjustment mode, and a cavity acoustic adjustment mode.

[0010] As a preferred scheme of the combustion control method based on the longitudinal multi-stage sudden expansion structure, the method further comprises: In the case that the sound pressure wave type is unstructured random noise, the noise signal is subjected to time domain identification processing to obtain a noise characteristic sequence; The noise characteristic sequence is subjected to encoding processing to obtain a noise characterization parameter; The pulsation combustion characterization parameter and the noise characterization parameter are determined as the target characterization parameter of the combustion state; The combustion regulation mode of the target characterization parameter comprises a fuel pulsation suppression mode, an air ratio adjustment mode, and a cavity acoustic adjustment mode.

[0011] As a preferred scheme of the combustion control method based on the longitudinal multi-stage sudden expansion structure, the target characterization parameter of the combustion process and the multiple combustion regulation modes of the target characterization parameter are determined according to the combustion state, comprising: In the case that the combustion state is a composite working condition, the target characterization parameter of the combustion process comprises at least a stable combustion characterization parameter and a disturbance combustion characterization parameter; The combustion regulation mode of the target characterization parameter comprises a stable combustion control mode, a pulsation combustion suppression mode, an air ratio adjustment mode, and a cavity coupling adjustment mode.

[0012] As a preferred scheme of the combustion control method based on the longitudinal multi-stage sudden expansion structure, the determination of the candidate combustion section associated with multiple combustion characteristics comprises: A first parameter index of multiple combustion characteristics is identified; Multiple combustion characteristics are classified according to the first parameter index to obtain all combustion characteristics belonging to the same second parameter index; A candidate combustion section corresponding to the second parameter index is determined; wherein the second parameter index is determined according to the first parameter index.

[0013] As a preferred scheme of the combustion control method based on the longitudinal multi-stage sudden expansion structure, the determination of the target combustion section from the candidate combustion section according to the adaptation degree of each combustion characteristic to the target characterization parameter comprises: The dominant combustion characteristic of the candidate combustion section is determined according to the adaptation degree of each combustion characteristic to the target characterization parameter; arranging the candidate combustion segments in descending order of the degrees of adaptation to the dominant combustion characteristics, and determining a target combustion segment as the candidate combustion segment corresponding to the maximum degree of adaptation if the maximum degree of adaptation is greater than a first preset threshold value; The method further includes determining a control scheme corresponding to the combustion state according to the target combustion segment. The method further includes determining a combustion control mode of the target combustion segment as the control scheme corresponding to the combustion state.

[0014] The method further includes determining a control scheme corresponding to the combustion state according to the target combustion segment. If the maximum degree of adaptation is less than or equal to the first preset threshold value and a degree of adaptation of a key combustion characteristic corresponding to the candidate combustion segment is greater than a second preset threshold value, a corresponding supplementary control parameter is generated based on an auxiliary ignition, secondary air supply or flow field disturbance mode. The first preset threshold value is greater than the second preset threshold value. If the degree of adaptation of the key combustion characteristic of the candidate combustion segment is less than the second preset threshold value, a neighboring combustion segment associated with the combustion state is determined. A control scheme corresponding to the combustion state is determined based on a combustion behavior of the neighboring combustion segment.

[0015] The combustion system applied to the combustion control method based on the longitudinal multi-stage sudden expansion structure includes a combustion data acquisition module configured to acquire combustion working condition data and determine a combustion state type of the combustion working condition data. A characteristic parameter processing module is configured to determine a target characteristic parameter of the combustion state and a plurality of combustion control modalities corresponding to the target characteristic parameter according to the combustion state type. A cavity matching module is configured to determine a plurality of combustion characteristic parameters matched with the target characteristic parameter from a preset multi-stage sudden expansion cavity database according to each of the combustion control modalities. A segment determination module is configured to determine a candidate combustion segment associated with the plurality of combustion characteristic parameters. A target segment determination module is configured to determine a target combustion segment from the candidate combustion segments according to a similarity between each of the combustion characteristic parameters and the target characteristic parameter. A combustion control scheme determination module is configured to determine a control scheme corresponding to the combustion state according to the target combustion segment.

[0016] The application further discloses a computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the combustion system based on a longitudinal multi-stage sudden expansion structure and a control method thereof when executing the computer program.

[0017] The application further discloses a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program implements the steps of the combustion system based on a longitudinal multi-stage sudden expansion structure and a control method thereof when being executed by a processor.

[0018] The application has the following beneficial effects: by determining the combustion state type, determining the target characteristic parameter of the combustion state according to the combustion state type, and the multiple combustion regulation modes corresponding to the target characteristic parameter, and according to each combustion regulation mode, determining the multiple characteristic parameters matched with the combustion characteristic parameters from the preset multi-stage sudden expansion cavity database, that is, by decomposing the combustion characteristics of a single section into multiple dimensions and performing retrieval based on multiple dimension combinations, the utilization rate of combustion information is improved. On this basis, the target combustion section is determined from the candidate combustion sections according to the fitting degree of each combustion characteristic parameter and the target characteristic parameter, and the regulation instruction data corresponding to the current combustion state is determined according to the target combustion section. In this way, the regulation signal matched with the state can be output in the case that the combustion state fluctuates, the combustion control is more accurate, and the combustion stability and energy efficiency are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings. Among them: Figure 1 The target characteristic parameter generation schematic diagram of the combustion control method based on the longitudinal multi-stage sudden expansion structure proposed by the application; Figure 2 The process schematic diagram of determining the final regulation scheme of the combustion control method based on the longitudinal multi-stage sudden expansion structure proposed by the application. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application will be described in detail in combination with the drawings of the specification.

[0021] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the present application.

[0022] It should also be noted that, as used in the specification and in the claims, the article "a", "an", or "the" is intended to mean that there are one or more of the features or elements. As used in this specification and the claims, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or clear from the context, the designation "X employs A or B" means that X employs A or B or both A and B. In addition, the articles "a", "an", and "the" are intended to mean that there are one or more (for example, one) of the features or elements, unless otherwise indicated or unless it would be clear from the context.

[0023] Reference will now be made to the drawings, in which Figure 1 For one embodiment of the present application, a combustion system based on longitudinal multi-stage sudden expansion structure and a control method thereof are provided, the method comprising the following steps: The combustion control method based on longitudinal multi-stage sudden expansion structure comprises the following steps: Step one: obtaining fuel supply parameters, and determining the combustion state type corresponding to the fuel supply parameters; The combustion state model includes stable combustion condition, pulsating combustion condition, and complex condition.

[0024] Step two: determining the target characteristic parameters of the combustion state and the multiple combustion regulation modes corresponding to the target characteristic parameters according to the combustion state type; The target characteristic parameters can be understood as the core criterion for combustion regulation. The determination of the criterion can be understood as the identification and extraction of the combustion state. By determining the combustion state type, the key parameters representing the combustion process can be extracted, and different combustion regulation modes can be driven accordingly to achieve precise intervention on the combustion process.

[0025] The number and type of target characteristic parameters corresponding to different combustion state types are different. The number of target characteristic parameters can be one or multiple. For example, in the stable combustion condition, the number of target characteristic parameters can be one, which can be a stable combustion characteristic parameter; in the pulsating combustion condition, the number of target characteristic parameters can be one or multiple, which can be a pulsating combustion characteristic parameter, or a combination of a pulsating combustion characteristic parameter and an acoustic characteristic parameter.

[0026] The number of target characteristic parameters can have an inclusion relationship with the number of combustion control modes, i.e., the number of target characteristic parameters can be less than or equal to the number of combustion control modes. For example, the combustion control modes corresponding to the stable combustion condition can include a main combustion flow rate control mode, an air staging control mode, and a cavity pressure feedback control mode; the combustion control modes corresponding to the pulsating combustion condition can include a fuel pulsation suppression mode, an air ratio adjustment mode, and a cavity geometry coupling mode.

[0027] Exemplarily, the combustion state can be stratified according to the stratification dimension corresponding to the combustion state type, to obtain target characteristic parameters corresponding to each layer, and a plurality of combustion control modes of each layer of target characteristic parameters is determined according to the combustion state type. The correspondence between the combustion state type and the combustion stratification dimension is predetermined, and the correspondence between the combustion state type and the control mode is also predetermined. For example, when the combustion state is a stable combustion condition, the stratification dimension is fuel supply and air ratio, and only stable combustion characteristic parameters are obtained; when the combustion state is a pulsating combustion condition, the stratification dimension includes flow fluctuation, sound pressure fluctuation, and disturbance characteristics, and corresponding pulsating combustion characteristic parameters, acoustic characteristic parameters, and noise characteristic parameters can be obtained.

[0028] Step three: determining a plurality of combustion characteristic parameters matching the target characteristic parameters from a preset multi-stage sudden expansion cavity database according to each combustion control mode; wherein the multi-stage sudden expansion cavity database includes a plurality of combustion sections, each combustion section includes feature information, and the feature information includes combustion characteristic parameters under different modes; The multi-stage sudden expansion cavity database is pre-established, each combustion section in the multi-stage sudden expansion cavity database is stored according to a preset format, the feature information can include section number, geometric parameter, flow field characteristic parameter, acoustic response parameter, and heat release parameter, and the combustion characteristic parameters under different modes include stable combustion characteristic parameters, pulsating combustion characteristic parameters, acoustic characteristic parameters, and noise characteristic parameters.

[0029] It can be understood that when the multi-stage sudden expansion cavity database is established according to actual combustion experiments or numerical simulation data, the combustion process needs to be stratified and analyzed. Specifically, the temperature field, flow field, sound pressure signal, and heat release signal in the combustion section need to be decomposed, the stratified results obtained are feature extracted and coded, the corresponding combustion characteristic parameters are obtained, and the combustion characteristic parameters and the corresponding original parameter contents are stored according to the preset format, so as to form the multi-stage sudden expansion cavity database. For example, when a combustion section is stratified, the section number, geometric parameter, and corresponding stable combustion characteristic parameters, acoustic characteristic parameters, and noise characteristic parameters can be obtained.

[0030] For the stratified results of each combustion section, further feature processing can be performed: for stable combustion conditions, the fuel flow to air ratio parameter is extracted to obtain the stable combustion characterization parameter E0; for flow pulsation characteristics, the pulsation combustion characterization parameter E1 is obtained based on time series signal analysis; if there is structured acoustic resonance, the acoustic characterization parameter E2 is obtained through frequency spectrum analysis; if there is unstructured random noise, the noise characterization parameter E3 is obtained through time domain identification. Among them, the processing of acoustic parameters can be realized through acoustic field identification algorithm, and the extraction of noise parameters can be completed through time domain or frequency domain filter.

[0031] It should be noted that the stored combustion section and its corresponding feature parameters can be matched according to the preset section division rule, or other existing ways can be used for matching, which will not be described here.

[0032] Exemplarily, according to each combustion control mode, a plurality of combustion feature parameters matching the target characterization parameter are determined from the preset multi-stage sudden expansion cavity database. Here, the combustion feature parameters can be obtained by calculating the adaptation degree of the target characterization parameter and each combustion feature parameter in the database, and the top N according to the order from large to small. For example, when the combustion state is stable combustion condition, the stable combustion characterization parameter E0 is searched, and the top ten is selected as the candidate section according to the preliminary screening of the adaptation degree; when the combustion state is pulsation combustion condition, if there is structured resonance, the pulsation combustion characterization parameter E1 and the acoustic characterization parameter E2 are used for candidate search; if it is random noise disturbance, E1 and E3 are used for candidate search; when the combustion state is a composite condition, E0 and E1, E2 or E3 can be used for candidate screening to determine a plurality of matched combustion feature parameters.

[0033] Step four: determining the candidate combustion section associated with the plurality of combustion feature parameters; It can be understood that the multi-stage sudden expansion cavity database is stored in a preset format, and each combustion feature parameter corresponds to a corresponding section number. Based on the section number, it can be determined which combustion feature parameters belong to the same combustion section, thereby realizing the attribution relationship between different combustion feature parameters and specific combustion sections.

[0034] In actual application, the stable combustion characterization parameter, the pulsation combustion characterization parameter, the acoustic characterization parameter or the noise characterization parameter extracted under different combustion conditions are bound to the section number according to the preset rule. Through this way, it can be ensured that when the candidate combustion section is screened, the plurality of combustion feature parameters belonging to the same section can be accurately classified.

[0035] Step five: determining the target combustion section from the candidate combustion section according to the adaptation degree of each combustion feature parameter and the target feature parameter.

[0036] Exemplarily, when determining the candidate combustion section associated with the plurality of combustion characteristic parameters, the target characteristic parameter and the regulation mode thereof can be determined according to the combustion state type, and then the adaptation degrees of the combustion characteristic parameters belonging to the candidate combustion section are determined for the candidate combustion section to obtain the comprehensive adaptation degree of the candidate combustion section. The determination manner of the comprehensive adaptation degree can be to select the adaptation degree of the dominant combustion characteristic as the representative value, or to select the top k candidate combustion sections after sorting the plurality of adaptation degrees as the target combustion section.

[0037] Step six: determining the regulation scheme corresponding to the combustion state according to the target combustion section.

[0038] It can be understood that the target combustion section can be understood as the input basis of the final regulation process, and the regulation instruction data corresponding to the current combustion state can be determined based on the target combustion section, wherein the current combustion state is the original state information collected in the running process of the combustion system.

[0039] The determination of the regulation instruction data corresponding to the current combustion state according to the target combustion section can be directly outputting the regulation mode contained in the target combustion section, or can be outputting the regulation instruction data corresponding to the combustion state after analyzing and processing the combustion characteristic parameters of the target combustion section. For example, if the adaptation degree of the top 1 candidate combustion section is greater than 0.9 and the candidate combustion section contains cavity acoustic feedback information, the corresponding regulation mode can be directly returned.

[0040] The above combustion regulation method determines the target characteristic parameter of the combustion state and the plurality of combustion regulation modes corresponding to the target characteristic parameter according to the combustion state type by determining the combustion state type, determines the target combustion section from the candidate combustion sections according to the adaptation degrees of the combustion characteristic parameters and the target characteristic parameter, and determines the regulation instruction data corresponding to the current combustion state according to the target combustion section. In this way, the regulation signal matched with the state can be output in the case that the combustion state fluctuates, the combustion control is more accurate, and the combustion stability and energy efficiency are improved.

[0041] In practical applications, the combustion state data of the combustion system can represent multiple combustion state types. For different combustion state types, the input combustion state data needs to be separated into multiple regulation modes, and matched according to the corresponding combustion regulation mode of each regulation mode. In an exemplary embodiment, the target characteristic parameter of the combustion state is determined according to the combustion state type, and the multiple combustion regulation modes corresponding to the target characteristic parameter include the following cases: Case one: in the case of stable combustion condition, the stable combustion characteristic parameter is obtained by extracting the main fuel flow and primary air ratio in the fuel supply parameter and performing parameter coding processing. The stable combustion characteristic parameter is determined as the target characteristic parameter, and the combustion regulation mode of the target characteristic parameter includes the main fuel flow rate regulation mode, the air staging regulation mode and the cavity pressure feedback regulation mode.

[0042] Case two: in the case of pulsating combustion condition, the fuel supply parameter shows periodic flow fluctuation. If the flow fluctuation amplitude exceeds the preset threshold, the dynamic feature extraction is performed on the fuel supply parameter to obtain the pulsating combustion characteristic parameter. The pulsating combustion characteristic parameter is determined as the target characteristic parameter. The multiple combustion regulation modes of the target characteristic parameter include the fuel pulsation suppression mode, the air ratio adjustment mode and the cavity geometry coupling mode.

[0043] Case three: in the case of structured resonance, the combustion acoustics description parameter is obtained by performing spectral summarization processing on the sound pressure signal. The acoustic characteristic parameter is obtained by performing feature coding processing on the combustion acoustics description parameter. The pulsating combustion characteristic parameter and the acoustic characteristic parameter are determined as the target characteristic parameters of the combustion state. The combustion regulation mode of the target characteristic parameter includes the fuel pulsation suppression mode, the air ratio adjustment mode and the cavity acoustic adjustment mode.

[0044] In the case of unstructured random noise of sound pressure fluctuation, the noise feature sequence is obtained by performing time domain identification processing on the noise signal. The noise characteristic parameter is obtained by performing coding processing on the noise feature sequence. The pulsating combustion characteristic parameter and the noise characteristic parameter are determined as the target characteristic parameters of the combustion state. The combustion regulation mode of the target characteristic parameter includes the fuel pulsation suppression mode, the air ratio adjustment mode and the cavity noise suppression mode.

[0045] Case four: in the case of complex condition of combustion state, the target characteristic parameters of the combustion process include at least the stable combustion characteristic parameter and the disturbance combustion characteristic parameter. The combustion regulation mode of the target characteristic parameter includes the stable combustion control mode, the pulsating combustion suppression mode, the air ratio adjustment mode and the cavity coupling adjustment mode.

[0046] In summary, the combustion state data can be more finely layered and analyzed, and the data of a single combustion state type can be as much as possible to be disassembled into multiple control modes, and then matched and screened based on each control mode, thereby improving the utilization rate of combustion information.

[0047] In addition, with reference to Figure 2 The embodiment of the present application also provides a method for determining a candidate combustion section associated with multiple combustion characteristics, which comprises the following steps: Identifying a first parameter index of the multiple combustion characteristics.

[0048] Classifying the multiple combustion characteristics according to the first parameter index to obtain all combustion characteristics belonging to the same second parameter index.

[0049] Determining a candidate combustion section corresponding to the second parameter index; wherein the second parameter index is determined according to the first parameter index.

[0050] According to the adaptation degree of each combustion characteristic to the target characteristic parameter, a dominant combustion characteristic of the candidate combustion section is determined; the dominant combustion characteristic is arranged in descending order of the adaptation degree; if the maximum adaptation degree is greater than a first preset threshold, the candidate combustion section corresponding to the maximum adaptation degree is determined as a target combustion section; a control scheme corresponding to the combustion state is determined according to the target combustion section, including determining the combustion control mode of the target combustion section as the control scheme corresponding to the combustion state.

[0051] Specifically: If the maximum adaptation degree is less than or equal to the first preset threshold, and the adaptation degree of the key combustion characteristic corresponding to the candidate combustion section is greater than a second preset threshold, the corresponding supplementary control parameter is generated based on the auxiliary ignition, secondary air supply or flow field disturbance mode; Wherein, the first preset threshold is greater than the second preset threshold; a control scheme corresponding to the combustion state is determined according to the combustion state of the candidate combustion section and the supplementary control parameter; If the adaptation degree of the key combustion characteristic of the candidate combustion section is less than the second preset threshold, a neighboring combustion section associated with the combustion state is determined, and a control scheme corresponding to the combustion state is determined based on the combustion behavior of the neighboring combustion section.

[0052] The embodiment also provides a combustion system applied to the combustion control method based on the longitudinal multi-stage abrupt expansion structure, comprising: a combustion data acquisition module for acquiring combustion working condition data and determining a combustion state type of the combustion working condition data; A characteristic parameter processing module is configured to determine a target characteristic parameter of the combustion state and multiple combustion control modes corresponding to the target characteristic parameter according to the combustion state type. The cavity matching module is configured to determine a plurality of combustion characteristic parameters matched with the target characteristic parameter from a preset multi-stage sudden expansion cavity database according to each combustion regulation mode; wherein the multi-stage sudden expansion cavity database comprises a plurality of combustion sections, and each combustion section comprises characteristic information, and the characteristic information comprises combustion characteristic parameters under different modes; The section determination module is configured to determine candidate combustion sections associated with the plurality of combustion characteristic parameters; The target section determination module is configured to determine a target combustion section from the candidate combustion sections according to the similarity between each combustion characteristic parameter and the target characteristic parameter; The combustion regulation scheme determination module is configured to determine a regulation scheme corresponding to the combustion state according to the target combustion section The embodiment also provides a computer device suitable for the case of the longitudinal multi-stage sudden expansion structure-based combustion control method, comprising a memory and a processor; the memory is configured to store computer executable instructions, and the processor is configured to execute the computer executable instructions to realize the longitudinal multi-stage sudden expansion structure-based combustion control method proposed in the above embodiment.

[0053] The computer device can be a terminal, and the computer device comprises a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is configured to perform wired or wireless communication with external terminals. The wireless communication can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer overlaid on the display screen, or a key, trackball or touchpad arranged on the shell of the computer device. In addition, the input device can also be an external keyboard, touchpad or mouse, etc.

[0054] The embodiment also provides a storage medium, which stores a computer program, and the computer program is executed by a processor to implement the combustion control method based on the longitudinal multi-stage sudden expansion structure as proposed in the above embodiment. The storage medium can be implemented by any type of volatile or non-volatile storage devices or a combination thereof, such as a static random access memory (SRAM), an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a programmable read-only memory (PROM), a read-only memory (ROM), a magnetic storage, a flash memory, a magnetic disk or an optical disk.

[0055] It should be noted that the above embodiment is only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. A combustion control method based on longitudinal multi-stage sudden expansion structure, characterized by, The method comprises the following steps: acquiring a fuel supply parameter, determining a combustion state type corresponding to the fuel supply parameter; determining a target characteristic parameter of the combustion state according to the combustion state type, and a plurality of combustion regulation modes corresponding to the target characteristic parameter; determining a plurality of combustion characteristic parameters matched with the target characteristic parameter from a preset multi-stage sudden expansion cavity database according to each of the combustion regulation modes; wherein the multi-stage sudden expansion cavity database comprises a plurality of combustion sections, and each combustion section comprises characteristic information, the characteristic information comprising combustion characteristic parameters under different modes; determining a candidate combustion section associated with the plurality of combustion characteristic parameters; determining a target combustion section from the candidate combustion section according to the fitting degree of each of the combustion characteristic parameters and the target characteristic parameter; determining a regulation scheme corresponding to the combustion state according to the target combustion section.

2. The combustion control method based on longitudinal multi-stage sudden expansion structure according to claim 1, characterized in that: Determining the target characteristic parameter of the combustion state according to the combustion state type, and a plurality of combustion regulation modes corresponding to the target characteristic parameter comprises: in the case that the combustion state type is a stable combustion condition, extracting a primary air ratio value of the fuel supply parameter, and performing parameter coding processing to obtain a stable combustion characteristic parameter, and determining the stable combustion characteristic parameter as the target characteristic parameter; the combustion regulation modes of the target characteristic parameter comprise a primary fuel flow rate regulation mode, an air staging regulation mode, and a cavity pressure feedback regulation mode.

3. The combustion control method based on longitudinal multi-stage sudden expansion configuration according to claim 1, characterized by: Determining the target characteristic parameter of the combustion state according to the combustion state type, and a plurality of combustion regulation modes corresponding to the target characteristic parameter comprises: in the case that the combustion state type is a pulsating combustion condition, the fuel supply parameter exhibits periodic flow fluctuation, and if the flow fluctuation amplitude exceeds a preset threshold, dynamic feature extraction is performed on the fuel supply parameter to obtain a pulsating combustion characteristic parameter, and the pulsating combustion characteristic parameter is determined as the target characteristic parameter; the plurality of combustion regulation modes of the target characteristic parameter comprise a fuel pulsation suppression mode, an air ratio adjustment mode, and a cavity geometry coupling mode.

4. The combustion control method based on longitudinal multi-stage sudden expansion structure according to claim 3, characterized in that: The method further comprises: if the pulsating combustion condition is accompanied by sound pressure fluctuation, identifying the fluctuation type of the sound pressure fluctuation; in the case that the fluctuation type is a structured resonance, performing frequency spectrum summarization processing on the sound pressure signal to obtain a combustion acoustics description parameter; performing feature coding processing on the combustion acoustics description parameter to obtain an acoustics characteristic parameter; determining the pulsating combustion characteristic parameter and the acoustics characteristic parameter as the target characteristic parameter of the combustion state; the combustion regulation modes of the target characteristic parameter comprise a fuel pulsation suppression mode, an air ratio adjustment mode, and a cavity acoustics adjustment mode.

5. The combustion control method based on longitudinal multi-stage sudden expansion configuration according to claim 3, characterized by: The method further comprises: in the case that the sound pressure fluctuation type is unstructured random noise, performing time domain identification processing on the noise signal to obtain a noise feature sequence; performing coding processing on the noise feature sequence to obtain a noise characteristic parameter; determining the pulsating combustion characteristic parameter and the noise characteristic parameter as the target characteristic parameter of the combustion state; The combustion regulation mode of the target characteristic parameter comprises a fuel pulsation suppression mode, an air ratio adjustment mode, and a cavity noise suppression mode.

6. The combustion control method based on longitudinal multi-stage sudden expansion configuration according to claim 1, characterized by: The target characteristic parameter of the combustion process is determined according to the combustion state, and the combustion regulation mode of the target characteristic parameter comprises: In the case that the combustion state is a complex working condition, the target characteristic parameter of the combustion process at least comprises a stable combustion characteristic parameter and a perturbed combustion characteristic parameter; The combustion regulation mode of the target characteristic parameter comprises a stable combustion control mode, a pulsation combustion suppression mode, an air ratio adjustment mode, and a cavity coupling adjustment mode.

7. The combustion control method based on longitudinal multi-stage sudden expansion structure according to any one of claims 1-6, characterized in that: The candidate combustion section associated with the plurality of combustion characteristics is determined, comprising: A first parameter index of the plurality of combustion characteristics is identified; The plurality of combustion characteristics is classified according to the first parameter index, so as to obtain all combustion characteristics belonging to the same second parameter index; A candidate combustion section corresponding to the second parameter index is determined, wherein the second parameter index is determined according to the first parameter index.

8. The combustion control method based on longitudinal multi-stage sudden expansion structure according to claim 7, characterized in that: The target combustion section is determined from the candidate combustion section according to the fitting degree of each combustion characteristic and the target characteristic parameter, comprising: The dominant combustion characteristic of the candidate combustion section is determined according to the fitting degree of each combustion characteristic and the target characteristic parameter; The candidate combustion section corresponding to the maximum fitting degree is determined as the target combustion section in the order of the fitting degree of the dominant combustion characteristic from large to small, if the maximum fitting degree is greater than a first preset threshold value; The combustion regulation mode of the target combustion section is determined as the regulation scheme corresponding to the combustion state. The combustion regulation mode of the target combustion section is determined as the regulation scheme corresponding to the combustion state.

9. The combustion control method based on longitudinal multi-stage sudden expansion structure according to claim 8, characterized in that: If the maximum fitting degree is less than or equal to the first preset threshold value, and the fitting degree of the key combustion characteristic corresponding to the candidate combustion section is greater than a second preset threshold value, a corresponding supplementary control parameter is generated based on an auxiliary ignition, secondary air supply, or flow field disturbance mode; The first preset threshold value is greater than the second preset threshold value; the regulation scheme corresponding to the combustion state is determined according to the combustion state of the candidate combustion section and the supplementary control parameter; If the fitting degree of the key combustion characteristic of the candidate combustion section is less than the second preset threshold value, a neighboring combustion section associated with the combustion state is determined; The regulation scheme corresponding to the combustion state is determined based on the combustion behavior of the neighboring combustion section. The system comprises:

10. The combustion system based on longitudinal multi-stage sudden expansion structure according to any one of claims 1-6, 8 or 9, characterized in that: A combustion data acquisition module is configured to acquire combustion working condition data and determine a combustion state type of the combustion working condition data; A characteristic parameter processing module is configured to determine a target characteristic parameter of the combustion state and a plurality of combustion regulation modes corresponding to the target characteristic parameter according to the combustion state type. ​ a cavity matching module configured to determine, according to each of the combustion regulation modes, a plurality of combustion characteristic parameters matched with the target characteristic parameter from a preset multi-stage abrupt expansion cavity database, wherein the multi-stage abrupt expansion cavity database comprises a plurality of combustion sections, and each of the combustion sections comprises characteristic information, and the characteristic information comprises combustion characteristic parameters under different modes; a section determination module configured to determine candidate combustion sections associated with the plurality of combustion characteristic parameters; a target section determination module configured to determine a target combustion section from the candidate combustion sections according to a similarity between each of the combustion characteristic parameters and the target characteristic parameter; a combustion regulation scheme determination module configured to determine a regulation scheme corresponding to the combustion state according to the target combustion section.

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