Supercritical fluid assisted fuel self-oscillation atomization system

Abstract

The invention relates to the technical field of fuel atomization. A supercritical fluid assisted fuel self-oscillation atomization system is provided, and the method comprises the following steps: establishing a coupling model of dynamic thermodynamics and fluid vorticity, and generating critical condition prediction data; according to the critical condition prediction data, designing a multi-stage self-oscillation cavity structure, and generating periodic pressure pulsation; through a vorticity sensor array and thermodynamic gradient feedback, a cooperative regulation and control module is deployed, and reverse compensation flow is generated; based on frequency matching of reverse compensation flow and self-excited oscillation pressure waves, phase synchronization processing is carried out, and dynamic equilibrium of transcritical interface energy is achieved; supercritical fluid and pressure waves obtained after phase matching are used for cooperatively breaking fuel flow to generate uniform atomized liquid drops, so that the problem that the dynamic thermodynamic gradient direction and vorticity distribution coupling effect is deficient due to density and viscosity sudden change in the phase change process is solved, and therefore the generation threshold value and evolution path of interface local vortices are predicted; and uniform atomization of the fuel is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel atomization, and particularly to a supercritical fluid-assisted fuel self-excited oscillation atomization system. Background Art

[0002] In the field of supercritical fluid-assisted fuel atomization, traditional technologies mainly rely on the Weber number model to predict droplet breakup behavior through the balance relationship between surface tension and inertial force. This model theoretically analyzes the droplet breakup process by balancing the relationship between surface tension and inertial force. The Weber number, as a dimensionless parameter, characterizes the relative magnitude between aerodynamic force and surface tension. When the Weber number is low, surface tension dominates and it is difficult for droplets to break up; while when the Weber number is high, inertial force dominates and droplets are prone to break up.

[0003] However, during the transcritical phase change process, when the fuel transforms from the liquid state to the supercritical state, its surface tension approaches zero, causing the traditional Weber number model to completely fail. Although traditional technologies have attempted to enhance the atomization effect by utilizing the high diffusivity of supercritical fluids, there are still problems such as the inability to predict the generation threshold and evolution path of local vortices at the interface due to the lack of consideration of the coupling effect between the direction of the dynamic thermodynamic gradient and vorticity distribution caused by sudden changes in density and viscosity during the phase change process. Summary of the Invention

[0004] Based on this, it is necessary to provide a supercritical fluid-assisted fuel self-excited oscillation atomization system for the above technical problems, so as to solve the problem of the lack of coupling effect between the direction of the dynamic thermodynamic gradient and vorticity distribution caused by sudden changes in density and viscosity during the phase change process, thereby predicting the generation threshold and evolution path of local vortices at the interface and achieving uniform atomization of the fuel.

[0005] The present application provides a supercritical fluid-assisted fuel self-excited oscillation atomization system, including:

[0006] A transcritical coupling modeling module for establishing a coupling model of dynamic thermodynamics and fluid vorticity based on the transcritical phase change characteristics of the fuel, and generating prediction data for the critical conditions of interface vortex and fracture;

[0007] A multi-stage cavity structure design module for designing a multi-stage self-excited oscillation cavity structure according to the critical condition prediction data and generating periodic pressure pulsations;

[0008] A reverse compensation regulation module for deploying a collaborative regulation module based on the periodic pressure pulsations through the vorticity sensor array and thermodynamic gradient feedback, and generating a reverse compensation flow;

[0009] A phase synchronization and equilibrium module for performing phase synchronization processing based on the frequency matching between the reverse compensation flow and the self-excited oscillation pressure wave to achieve dynamic equilibrium of the transcritical interface energy;

[0010] A supercritical collaborative fragmentation module, which is used to generate uniform atomized droplets by synergistically fragmenting a fuel stream based on the dynamic equilibrium of cross-critical interface energy and utilizing the pressure wave after phase matching between a supercritical fluid and a phase.

[0011] Furthermore, based on the frequency matching between reverse compensation flow and self-excited oscillation pressure wave, phase synchronization processing is performed to achieve the dynamic equilibrium of cross-critical interface energy, including:

[0012] Based on a multi-stage self-excited oscillation cavity structure, the fundamental frequency and harmonic components of pressure pulsation are extracted to generate frequency characteristic data;

[0013] According to the frequency characteristic data, the injection timing of pulsed jets is adjusted to generate a phase-matched jet sequence;

[0014] By superimposing the phase difference between the phase-matched jet sequence and the self-excited oscillation pressure wave, the interface vortex function is cancelled to achieve the dynamic equilibrium of cross-critical interface energy.

[0015] Furthermore, based on periodic pressure pulses, a collaborative regulation module is deployed through a vorticity sensor array and thermodynamic gradient feedback to generate reverse compensation flow, including:

[0016] A vorticity sensor array is embedded in the channel wall surface in the cross-critical phase change region to collect the interface vortex intensity in real time;

[0017] In the direction of the dynamic thermodynamic gradient, the injection angle of the reverse compensation flow is calculated;

[0018] According to the interface vortex intensity and the injection angle, reverse compensation flow is generated.

[0019] Furthermore, according to the critical condition prediction data, a multi-stage self-excited oscillation cavity structure is designed to generate periodic pressure pulsation, including:

[0020] According to the critical condition prediction data, the cross-critical phase change region is divided;

[0021] A multi-stage contraction-expansion channel is set upstream of the cross-critical phase change region to generate channel geometric configuration parameters;

[0022] By adjusting the contraction ratio and expansion angle of the channel geometric configuration parameters, periodic pressure pulsation is generated.

[0023] Furthermore, based on the cross-critical phase change characteristics of the fuel, a coupling model of dynamic thermodynamics and fluid vorticity is established to generate critical condition prediction data for interface vortex and fracture, including:

[0024] Based on the density mutation characteristic and viscosity mutation characteristic of the fuel in the supercritical state, thermodynamic parameter extraction processing is performed to generate thermodynamic state parameters;

[0025] Perform dynamic thermodynamic gradient direction calculation and processing based on thermodynamic state parameters to generate dynamic thermodynamic gradient direction data;

[0026] Based on the dynamic thermodynamic gradient direction data and the fluid vorticity distribution law, perform critical condition prediction and processing for interface vortex and fracture to generate critical condition prediction data.

[0027] Furthermore, by adjusting the contraction ratio and expansion angle of the multi-stage contraction-expansion flow channel, periodic pressure pulsation is generated, and it also includes:

[0028] Generate initial vortices through the high contraction ratio of the first-stage flow channel of the multi-stage contraction-expansion flow channel;

[0029] Based on the decreasing characteristic of the expansion angle of the second-stage flow channel of the multi-stage contraction-expansion flow channel structure parameters, perform vortex intensity amplification processing to generate enhanced vortices;

[0030] Based on the initial vortices and enhanced vortices, through the sudden change of the contraction ratio of the third-stage flow channel of the multi-stage contraction-expansion flow channel structure parameters, perform periodic pressure pulsation generation processing to generate periodic pressure pulsation.

[0031] Furthermore, according to the interface vortex intensity and injection angle, generate reverse compensation flow, and it also includes:

[0032] Perform threshold comparison processing based on the real-time monitoring data of the interface vortex intensity to generate a compensation trigger signal;

[0033] Based on the compensation trigger signal, use the reverse relationship between the dynamic thermodynamic gradient direction data and the vortex rotation direction to perform pulse jet angle optimization processing to generate an optimized injection angle;

[0034] Through the coordination of the optimized injection angle and the multi-nozzle array, perform reverse compensation flow generation processing to generate reverse compensation flow.

[0035] Furthermore, based on the dynamic equilibrium of the trans-critical interface energy, use the supercritical fluid and the pressure wave after phase matching to synergistically break the fuel flow to generate uniformly atomized droplets, including:

[0036] Based on the flow channel layout downstream of the multi-stage self-excited oscillation cavity, perform ring-shaped supercritical fluid injection channel setting processing to generate ring-shaped injection channel parameters;

[0037] Through the ring-shaped injection channel parameters, perform supercritical fluid penetration processing to generate a fuel flow with reduced interface viscosity;

[0038] Combined with the shearing effect of the pressure wave after phase matching, perform fuel flow fragmentation processing to generate uniformly atomized droplets.

[0039] The technical solution provided by this application includes the following technical effects: By providing a supercritical fluid-assisted fuel self-excited oscillation atomization system, including: a transcritical coupling modeling module for establishing a coupling model of dynamic thermodynamics and fluid vorticity based on the transcritical phase change characteristics of the fuel, and generating critical condition prediction data for interface vortex generation and breakup; a multi-stage cavity structure design module for designing a multi-stage self-excited oscillation cavity structure according to the critical condition prediction data, and generating periodic pressure pulsations; a reverse compensation regulation module for deploying a cooperative regulation module based on the periodic pressure pulsations through vorticity sensor arrays and thermodynamic gradient feedback, and generating reverse compensation flows; a phase synchronization equilibrium module for performing phase synchronization processing based on the frequency matching of the reverse compensation flow and the self-excited oscillation pressure wave to achieve dynamic equilibrium of the transcritical interface energy; a supercritical cooperative breakup module for using the supercritical fluid and the pressure wave after phase matching based on the dynamic equilibrium of the transcritical interface energy to cooperatively break up the fuel flow and generate uniform atomized droplets, so as to solve the problem of the lack of coupling effect between the dynamic thermodynamic gradient direction and the vorticity distribution caused by sudden changes in density and viscosity during the phase change process, thereby predicting the generation threshold and evolution path of local interface vortices and achieving uniform atomization of the fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a structural diagram of a supercritical fluid-assisted fuel self-excited oscillation atomization system in an embodiment of the present invention;

[0042] Figure 2 It is a flowchart of using a supercritical fluid and a pressure wave after phase matching to cooperatively break up a fuel flow and generate uniform atomized droplets based on the dynamic equilibrium of the transcritical interface energy in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] In order to make the above objects, features, and advantages of this application more obvious and understandable, the following will provide a detailed description of the specific implementation manners of this application with reference to the drawings. Many specific details are set forth in the following description in order to fully understand this application. However, this application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the application. Therefore, this application is not limited by the specific embodiments disclosed below.

[0044] The supercritical fluid in this application refers to the state where a substance is in a supercritical state when both its temperature and pressure exceed its critical point. At this time, it has the properties of a gas and can be easily compressed or expanded, and like a liquid, it has a relatively large density, but its viscosity is smaller than that of a liquid, and it has good fluidity and heat conduction performance. The dielectric constant of the supercritical fluid changes sharply with pressure. By controlling the temperature and pressure of the supercritical fluid, it is convenient to change its density and solvent properties, making it widely used in chemical reactions and separations.

[0045] The fuel self-excited oscillation atomization in this application refers to that under specific nozzle structures and pressure conditions, by utilizing the self-excited oscillation effect generated by the fuel fluid inside the nozzle, the fuel can be rapidly broken into fine droplets after being ejected, forming a uniform atomization effect, thereby improving the combustion efficiency and reducing pollutant emissions.

[0046] This application provides a supercritical fluid-assisted fuel self-excited oscillation atomization system 100, including:

[0047] A transcritical coupling modeling module 101, which is used to establish a coupling model of dynamic thermodynamics and fluid vorticity based on the transcritical phase change characteristics of the fuel, and generate critical condition prediction data for interface vortex and fracture.

[0048] Specifically, the transcritical coupling modeling module 101 extracts and processes thermodynamic parameters based on the transcritical phase change characteristics of the fuel to generate thermodynamic state parameters. Then, based on these parameters, it calculates the dynamic thermodynamic gradient direction data. Next, in combination with the fluid vorticity distribution law, it conducts critical condition prediction processing for interface vortex and fracture, and then generates critical condition prediction data for interface vortex and fracture.

[0049] A multi-stage cavity structure design module 102, which is used to design a multi-stage self-excited oscillation cavity structure based on the critical condition prediction data and generate periodic pressure pulsations.

[0050] Specifically, the multi-stage cavity structure design module 102 divides the transcritical phase change region according to the critical condition prediction data. Then, it sets up multi-stage contraction-expansion channels upstream of the transcritical phase change region and generates channel geometric configuration parameters. Next, by adjusting the contraction ratio and expansion angle of the channel geometric configuration parameters, it generates periodic pressure pulsations. Among them, the high contraction ratio of the first-stage channel generates an initial vortex, the decreasing expansion angle characteristic of the second-stage channel amplifies the vortex intensity, and the sudden change of the contraction ratio of the third-stage channel realizes the generation of periodic pressure pulsations.

[0051] A reverse compensation regulation module 103, which is used to deploy a cooperative regulation module based on the periodic pressure pulsations through the vorticity sensor array and thermodynamic gradient feedback, and generate reverse compensation flow.

[0052] Specifically, the reverse compensation control module 103 embeds a vorticity sensor array on the channel wall surface in the transcritical phase change region to collect the interfacial vortex intensity in real time. Then, in the direction of the dynamic thermodynamic gradient, the injection angle of the reverse compensation flow is calculated. Next, based on the interfacial vortex intensity and the injection angle, the reverse compensation flow is generated. Among them, threshold comparison processing is performed on the real-time monitoring data of the interfacial vortex intensity to generate a compensation trigger signal. Based on the compensation trigger signal, using the reverse relationship between the dynamic thermodynamic gradient direction data and the vortex rotation direction, pulse jet angle optimization processing is carried out to generate an optimized injection angle. After that, through the cooperation of the optimized injection angle and the multi-nozzle array, reverse compensation flow generation processing is carried out to generate the reverse compensation flow.

[0053] The phase synchronization and equalization module 104 is used to perform phase synchronization processing based on the frequency matching between the reverse compensation flow and the self-excited oscillation pressure wave to achieve dynamic equalization of the transcritical interface energy.

[0054] Specifically, the phase synchronization and equalization module 104 extracts the fundamental frequency and harmonic components of the pressure pulsation based on the multi-stage self-excited oscillation cavity structure to generate frequency characteristic data. Then, according to these data, the injection timing of the pulse jet is adjusted to generate a jet sequence that is phase-matched with the self-excited oscillation pressure wave. After that, through the superposition of the phase difference between the phase-matched jet sequence and the self-excited oscillation pressure wave, the interfacial vortex function is cancelled to achieve dynamic equalization of the transcritical interface energy.

[0055] The supercritical collaborative fragmentation module 105 is used to collaboratively fragment the fuel flow based on the dynamic equalization of the transcritical interface energy, using the supercritical fluid and the pressure wave after phase matching to generate uniform atomized droplets.

[0056] Specifically, the supercritical collaborative fragmentation module 105 sets an annular supercritical fluid injection channel based on the channel layout downstream of the multi-stage self-excited oscillation cavity. Then, supercritical fluid penetration treatment is carried out through the above channel to reduce the interfacial viscosity of the fuel flow. Then, combined with the shearing action of the pressure wave after phase matching, the fuel flow is fragmented, and then uniform atomized droplets are generated.

[0057] The supercritical fluid-assisted fuel self-excited oscillation atomization system provided by the embodiments of the present application includes: a transcritical coupling modeling module for establishing a coupling model of dynamic thermodynamics and fluid vorticity based on the transcritical phase change characteristics of the fuel, and generating critical condition prediction data for interface vortex generation and breakup; a multi-stage cavity structure design module for designing a multi-stage self-excited oscillation cavity structure according to the critical condition prediction data, and generating periodic pressure pulsations; a reverse compensation regulation module for deploying a collaborative regulation module based on the periodic pressure pulsations through a vorticity sensor array and thermodynamic gradient feedback, and generating a reverse compensation flow; a phase synchronization and equilibrium module for performing phase synchronization processing based on the frequency matching between the reverse compensation flow and the self-excited oscillation pressure wave, and achieving dynamic equilibrium of the transcritical interface energy; and a supercritical collaborative breakup module for collaboratively breaking up the fuel flow based on the dynamic equilibrium of the transcritical interface energy, using the supercritical fluid and the pressure wave after phase matching, and generating uniform atomized droplets, so as to solve the problem of the lack of coupling effect between the dynamic thermodynamic gradient direction and the vorticity distribution caused by sudden changes in density and viscosity during the phase change process, thereby predicting the generation threshold and evolution path of local interface vortices, and achieving uniform atomization of the fuel

[0058] Further, performing phase synchronization processing based on the frequency matching between the reverse compensation flow and the self-excited oscillation pressure wave to achieve dynamic equilibrium of the transcritical interface energy includes:

[0059] (1) Based on the multi-stage self-excited oscillation cavity structure, extracting the fundamental frequency and harmonic components of the pressure pulsation to generate frequency characteristic data;

[0060] (2) According to the frequency characteristic data, adjusting the injection timing of the pulsed jet to generate a phase-matched jet sequence;

[0061] (3) By superimposing the phase difference between the phase-matched jet sequence and the self-excited oscillation pressure wave, canceling the interface vortex function, and achieving dynamic equilibrium of the transcritical interface energy.

[0062] Specifically, when the phase synchronization and equilibrium module 104 operates, relying on the multi-stage self-excited oscillation cavity structure, it accurately extracts the fundamental frequency and harmonic components of the pressure pulsation to generate detailed frequency characteristic data. Then, based on these data, it finely adjusts the injection timing of the pulsed jet to generate a jet sequence that perfectly phase-matches the self-excited oscillation pressure wave. After that, by superimposing the phase difference between the phase-matched jet sequence and the self-excited oscillation pressure wave, it effectively cancels the interface vortex function, thereby achieving dynamic equilibrium of the transcritical interface energy and ensuring the efficiency and relatively high accuracy of the whole process.

[0063] Further, based on the periodic pressure pulses, deploying a collaborative regulation module through a vorticity sensor array and thermodynamic gradient feedback to generate a reverse compensation flow includes:

[0064] (1) Embed a vorticity sensor array on the channel wall in the transcritical phase change region to collect the interfacial vortex intensity in real time;

[0065] (2) Calculate the injection angle of the reverse compensation flow in the direction of the dynamic thermodynamic gradient;

[0066] (3) Generate the reverse compensation flow according to the interfacial vortex intensity and the injection angle.

[0067] Specifically, when the reverse compensation control module 103 operates, it embeds a vorticity sensor array on the channel wall in the transcritical phase change region to collect the interfacial vortex intensity in real time. Then, it calculates the injection angle of the reverse compensation flow in the direction of the dynamic thermodynamic gradient. Next, it generates the reverse compensation flow according to the interfacial vortex intensity and the injection angle. Among them, threshold comparison processing is performed based on the real-time monitoring data of the interfacial vortex intensity to generate a compensation trigger signal. Based on the compensation trigger signal, pulse jet angle optimization processing is performed using the reverse relationship between the dynamic thermodynamic gradient direction data and the vortex rotation direction to generate an optimized injection angle. Then, through the cooperation of the optimized injection angle and the multi-nozzle array, reverse compensation flow generation processing is performed to generate the reverse compensation flow.

[0068] Furthermore, according to the critical condition prediction data, a multi-stage self-excited oscillation cavity structure is designed to generate periodic pressure pulsations, including:

[0069] (1) Divide the transcritical phase change region according to the critical condition prediction data;

[0070] (2) Set a multi-stage contraction-expansion channel upstream of the transcritical phase change region to generate channel geometric configuration parameters;

[0071] (3) Generate periodic pressure pulsations by adjusting the contraction ratio and expansion angle of the channel geometric configuration parameters.

[0072] Specifically, when the multi-stage cavity structure design module 102 operates, it divides the transcritical phase change region according to the critical condition prediction data. Then, it sets a multi-stage contraction-expansion channel upstream of the transcritical phase change region and generates channel geometric configuration parameters. Next, it generates periodic pressure pulsations by adjusting the contraction ratio and expansion angle of the channel geometric configuration parameters. Among them, the high contraction ratio of the first-stage channel generates initial vortices, the decreasing characteristic of the expansion angle of the second-stage channel amplifies the vortex intensity, and the sudden change of the contraction ratio of the third-stage channel realizes the generation of periodic pressure pulsations.

[0073] Furthermore, based on the transcritical phase change characteristics of the fuel, a coupling model of dynamic thermodynamics and fluid vorticity is established to generate critical condition prediction data for interfacial vortex and fracture, including:

[0074] (1) Based on the density mutation characteristics and viscosity mutation characteristics of fuel in the supercritical state, thermodynamic parameter extraction and processing are carried out to generate thermodynamic state parameters;

[0075] (2) According to the thermodynamic state parameters, dynamic thermodynamic gradient direction calculation and processing are carried out to generate dynamic thermodynamic gradient direction data;

[0076] (3) Based on the dynamic thermodynamic gradient direction data and the fluid vorticity distribution law, critical condition prediction and processing of interface vortex and fracture are carried out to generate critical condition prediction data.

[0077] Specifically, when the transcritical coupling modeling module 101 is running, based on the density mutation characteristics and viscosity mutation characteristics of fuel in the supercritical state, thermodynamic parameter extraction and processing are carried out to generate thermodynamic state parameters. Then, according to these thermodynamic state parameters, dynamic thermodynamic gradient direction calculation and processing are carried out to generate dynamic thermodynamic gradient direction data. Next, combined with the fluid vorticity distribution law, critical condition prediction and processing of interface vortex and fracture are carried out, and then critical condition prediction data of interface vortex and fracture are generated. The above process involves complex fluid mechanics and thermodynamics coupling calculations. Through accurate model establishment and data processing, it provides key theoretical support and technical guidance for the subsequent atomization system design.

[0078] Furthermore, by adjusting the contraction ratio and expansion angle of the multi-stage contraction-expansion flow channel, periodic pressure pulsations are generated, and it also includes:

[0079] (1) Through the high contraction ratio of the first-stage flow channel of the multi-stage contraction-expansion flow channel, initial vortices are generated;

[0080] (2) Based on the decreasing characteristic of the expansion angle of the second-stage flow channel of the multi-stage contraction-expansion flow channel structure parameters, vortex intensity amplification processing is carried out to generate enhanced vortices;

[0081] (3) Based on the initial vortices and the enhanced vortices, through the sudden change of the contraction ratio of the third-stage flow channel of the multi-stage contraction-expansion flow channel structure parameters, periodic pressure pulsation generation processing is carried out to generate periodic pressure pulsations.

[0082] Specifically, when the multi-stage cavity structure design module 102 is running, it divides the transcritical phase change region according to the critical condition prediction data. Then, a multi-stage contraction-expansion flow channel is set upstream of the transcritical phase change region, and the geometric configuration parameters of the flow channel are generated. Next, by adjusting the contraction ratio and expansion angle of the geometric configuration parameters of the flow channel, periodic pressure pulsations are generated. Among them, the high contraction ratio of the first-stage flow channel generates an initial vortex, the decreasing characteristic of the expansion angle of the second-stage flow channel amplifies the vortex intensity, and the sudden change of the contraction ratio of the third-stage flow channel realizes the generation of periodic pressure pulsations. The above process ensures the periodicity and stability of the pressure pulsations through relatively precise flow channel design and parameter adjustment, thus providing a uniform energy input for the subsequent atomization process.

[0083] Further, according to the interfacial vortex intensity and injection angle, a reverse compensation flow is generated, and it further includes:

[0084] (1) Perform threshold comparison processing based on the real-time monitoring data of the interfacial vortex intensity to generate a compensation trigger signal;

[0085] (2) Based on the compensation trigger signal, use the reverse relationship between the dynamic thermodynamic gradient direction data and the vortex rotation direction to perform pulse jet angle optimization processing to generate an optimized injection angle;

[0086] (3) Through the cooperation of the optimized injection angle and the multi-nozzle array, perform reverse compensation flow generation processing to generate a reverse compensation flow.

[0087] Specifically, when the reverse compensation control module 103 is running, a vorticity sensor array is embedded in the wall of the flow channel in the transcritical phase change region to collect the interfacial vortex intensity in real time. Then, the injection angle of the reverse compensation flow is calculated in the dynamic thermodynamic gradient direction. Next, according to the interfacial vortex intensity and injection angle, a reverse compensation flow is generated. Among them, threshold comparison processing is performed based on the real-time monitoring data of the interfacial vortex intensity to generate a compensation trigger signal. Based on the compensation trigger signal, use the reverse relationship between the dynamic thermodynamic gradient direction data and the vortex rotation direction to perform pulse jet angle optimization processing to generate an optimized injection angle. After that, through the cooperation of the optimized injection angle and the multi-nozzle array, perform reverse compensation flow generation processing to generate a reverse compensation flow.

[0088] Further, as Figure 2 shown, based on the dynamic equilibrium of the energy at the transcritical interface, using the pressure wave after the supercritical fluid is phase-matched, the fuel flow is cooperatively broken to generate uniform atomized droplets, including:

[0089] S201: Based on the flow channel layout downstream of the multi-stage self-excited oscillation cavity, perform ring-shaped supercritical fluid injection channel setting processing to generate ring-shaped injection channel parameters.

[0090] Specifically, when the supercritical collaborative crushing module 105 is running, it performs the setting process of the annular supercritical fluid injection channel based on the flow channel layout downstream of the multi-stage self-excited oscillation cavity, and generates the annular injection channel parameters. Among them, the layout of the flow channel downstream of the multi-stage self-excited oscillation cavity is first determined, and then the annular supercritical fluid injection channel is set on the wall of the flow channel or a specific position to ensure that it is in full contact with the fuel flow. Then, according to the principles of fluid dynamics and experimental data, the structural parameters of the annular injection channel are determined, such as the diameter, length, number of channels, and the spacing between adjacent channels, so as to ensure that the supercritical fluid can evenly penetrate into the fuel flow, reduce its interfacial viscosity, and provide good conditions for the subsequent fuel flow crushing process.

[0091] S202: Perform supercritical fluid infiltration treatment through annular injection channel parameters to generate a fuel flow with reduced interface viscosity.

[0092] Specifically, according to the structural parameters of the annular injection channel, such as channel diameter, length, number and spacing, the injection flow rate and speed of the supercritical fluid are precisely controlled to make it evenly penetrate into the fuel flow. Then, the supercritical fluid is fully mixed with the fuel flow, and its high diffusivity and low viscosity characteristics are used to reduce the interfacial viscosity of the fuel flow, enhance the interaction between the fuel flow and the pressure wave, and provide good conditions for the subsequent fuel flow fragmentation process.

[0093] S203: Combined with the shearing effect of the pressure wave after phase matching, the fuel flow is broken up to generate uniform atomized droplets.

[0094] Specifically, the dynamic balance of transcritical interface energy is achieved through the phase synchronization balance module 104 to ensure that the fuel flow is under suitable fragmentation conditions. Then, the high diffusivity and low viscosity characteristics of the supercritical fluid are used in conjunction with the pressure wave after phase matching to apply shear force to the fuel flow. Under the action of the shear force, the fuel flow is broken into droplets of uniform size, thereby achieving an efficient atomization process.

[0095] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0096] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to the descriptions of the method embodiments. The device embodiments described above are merely illustrative. The components described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present disclosure solution. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0097] The above embodiments only represent several implementation manners of the embodiments of the present application. The descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the embodiments of the application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the embodiments of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the embodiments of the present application.

Claims

1. A supercritical fluid-assisted fuel self-excited oscillation atomization system, characterized in that, The system includes: A transcritical coupling modeling module, which is used to establish a coupling model of dynamic thermodynamics and fluid vorticity based on the transcritical phase change characteristics of fuel, and generate prediction data of critical conditions for interfacial vortex and fracture; A multi-stage cavity structure design module, which is used to design a multi-stage self-excited oscillation cavity structure according to the critical condition prediction data, and generate periodic pressure pulsations; A reverse compensation regulation module, which is used to deploy a collaborative regulation module based on the periodic pressure pulsations through the vorticity sensor array and thermodynamic gradient feedback, and generate reverse compensation flow; A phase synchronization and equilibrium module, which is used to perform phase synchronization processing based on the frequency matching between the reverse compensation flow and the self-excited oscillation pressure wave, and achieve dynamic equilibrium of transcritical interfacial energy; A supercritical collaborative fragmentation module, which is used to synergistically fragment the fuel flow based on the dynamic equilibrium of the transcritical interfacial energy, using supercritical fluid and the pressure wave after phase matching, and generate uniformly atomized droplets.

2. The supercritical fluid-assisted fuel self-excited oscillation atomization system according to claim 1, characterized in that, The performing phase synchronization processing based on the frequency matching between the reverse compensation flow and the self-excited oscillation pressure wave to achieve dynamic equilibrium of transcritical interfacial energy includes: Based on the multi-stage self-excited oscillation cavity structure, extracting the fundamental frequency and harmonic components of the pressure pulsation, and generating frequency characteristic data; According to the frequency characteristic data, adjusting the injection timing of the pulsed jet to generate a phase-matched jet sequence; By superimposing the phase difference between the phase-matched jet sequence and the self-excited oscillation pressure wave, canceling the interfacial vortex function, and achieving dynamic equilibrium of the transcritical interfacial energy.

3. The supercritical fluid-assisted fuel self-excited oscillation atomization system according to claim 1, wherein The deploying a collaborative regulation module based on the periodic pressure pulse through the vorticity sensor array and thermodynamic gradient feedback to generate reverse compensation flow includes: Embedding a vorticity sensor array on the channel wall surface in the transcritical phase change region to collect the interfacial vortex intensity in real time; Calculating the injection angle of the reverse compensation flow in the direction of the dynamic thermodynamic gradient; Generating the reverse compensation flow according to the interfacial vortex intensity and the injection angle.

4. The supercritical fluid-assisted fuel self-excited oscillation atomization system according to claim 1, wherein The designing a multi-stage self-excited oscillation cavity structure according to the critical condition prediction data to generate periodic pressure pulsations includes: Dividing the transcritical phase change region according to the critical condition prediction data; Setting a multi-stage contraction-expansion channel upstream of the transcritical phase change region to generate channel geometric configuration parameters; Generating the periodic pressure pulsations by adjusting the contraction ratio and expansion angle of the channel geometric configuration parameters.

5. The supercritical fluid-assisted fuel self-excited oscillation atomization system according to claim 1, wherein The establishing a coupling model of dynamic thermodynamics and fluid vorticity based on the transcritical phase change characteristics of fuel to generate prediction data of critical conditions for interfacial vortex and fracture includes: Based on the density mutation characteristic and viscosity mutation characteristic of fuel in the supercritical state, performing thermodynamic parameter extraction processing to generate thermodynamic state parameters; According to the thermodynamic state parameters, performing dynamic thermodynamic gradient direction calculation processing to generate dynamic thermodynamic gradient direction data; Based on the dynamic thermodynamic gradient direction data and the fluid vorticity distribution law, performing critical condition prediction processing for interfacial vortex and fracture to generate the critical condition prediction data.

6. The supercritical fluid-assisted fuel self-excited oscillation atomization system according to claim 4, wherein The generating the periodic pressure pulsations by adjusting the contraction ratio and expansion angle of the multi-stage contraction-expansion channel further includes: An initial vortex is generated through the high contraction ratio of the first-stage flow channel of the multi-stage contraction-expansion flow channel; Based on the decreasing characteristic of the expansion angle of the second-stage flow channel of the multi-stage contraction-expansion flow channel structure parameters, vortex intensity amplification processing is carried out to generate an enhanced vortex; Based on the initial vortex and the enhanced vortex, through the sudden change of the contraction ratio of the third-stage flow channel of the multi-stage contraction-expansion flow channel structure parameters, periodic pressure pulsation generation processing is carried out to generate the periodic pressure pulsation.

7. The supercritical fluid-assisted fuel self-excited oscillation atomization system according to claim 3, wherein The generating of the reverse compensation flow according to the interfacial vortex intensity and the injection angle further includes: Performing threshold comparison processing based on the real-time monitoring data of the interfacial vortex intensity to generate a compensation trigger signal; Based on the compensation trigger signal, using the reverse relationship between the dynamic thermodynamic gradient direction data and the vortex rotation direction, pulse jet angle optimization processing is carried out to generate an optimized injection angle; Through the cooperation of the optimized injection angle and the multi-nozzle array, reverse compensation flow generation processing is carried out to generate the reverse compensation flow.

8. The supercritical fluid-assisted fuel self-excited oscillation atomization system according to claim 1, characterized in that, The generating of uniform atomized droplets by synergistically breaking the fuel flow using the supercritical fluid and the pressure wave after phase matching based on the dynamic equilibrium of the trans-critical interface energy includes: Based on the flow channel layout downstream of the multi-stage self-excited oscillation cavity, ring-shaped supercritical fluid injection channel setting processing is carried out to generate ring-shaped injection channel parameters; Through the ring-shaped injection channel parameters, supercritical fluid penetration processing is carried out to generate a fuel flow with reduced interfacial viscosity; Combined with the shearing action of the pressure wave after phase matching, the fuel flow is broken to generate the uniform atomized droplets.

Images