A method for designing a pneumatic lens structure for strong laser irradiation of nanoparticles

Abstract

The present invention provides a method for designing a pneumatic lens structure for irradiating nanoparticles with strong laser, which belongs to the technical field of pneumatic lens structure design, and includes: constructing a fluid mechanics model of a carrier gas in a pneumatic lens and a discrete element model of nanoparticles; defining initial carrier gas parameters of the carrier gas, initial particle parameters of the nanoparticles, and an iterative termination condition; within a new time step, determining a carrier gas update parameter based on the fluid mechanics model and the initial carrier gas parameters, and determining a particle update parameter based on the discrete element model and the initial particle parameters; determining the mutual influence between the carrier gas and the nanoparticles, and adjusting the carrier gas update parameter based on the mutual influence to obtain a carrier gas adjustment parameter; when the iterative termination condition is met, determining the design parameters of the pneumatic lens based on the carrier gas adjustment parameter. In the process of designing the pneumatic lens structure, the present invention takes into account both the fluid behavior and the particle movement, thereby improving the transport efficiency of nanoparticles in the pneumatic lens.

Description

Technical Field

[0001] The invention relates to the technical field of structure design, and in particular to a method for designing a pneumatic lens structure for irradiating nanoparticles with strong laser. Background Art

[0002] Detecting the momentum distribution of photoelectrons and photoions after strong laser irradiation of nanoparticles is an important research method for the interaction mechanism between nanoparticles and ultrafast lasers. The pneumatic lens transports nanoparticle aerosols from the atmospheric environment to a high vacuum cavity, and is a core device in the fields of physics and engineering. The pneumatic lens consists of a series of thin plate holes with successively smaller apertures. Its working principle is: when the airflow carrying nanoparticles passes through the multi-stage chamber of the pneumatic lens, it will undergo a series of processes of first contraction and then expansion after flowing through the lens hole. Since the inertia of nanoparticles is much greater than that of carrier gas molecules, after passing through the lens, the nanoparticles will deviate from the flow trajectory of the carrier gas molecules and accumulate toward the central axis of the airflow, thereby stripping off the gas, retaining the nanoparticles as much as possible and transporting them to the high vacuum cavity.

[0003] The rationality of the pneumatic lens structure design is one of the keys to improving the delivery efficiency. In the prior art, the pneumatic lens is designed using a calculation method based on fluid mechanics, but this method only considers the behavior of the gas, ignoring or simplifying the influence of nanoparticles to a constant, and judging the quality of the structure by the flow field distribution of the airflow, which makes it very easy for nanoparticles to gather in the cavity of the pneumatic lens, seriously reducing the nanoparticle delivery efficiency.

[0004] There is an urgent need to provide a method for designing an aerodynamic lens structure for strong laser irradiation of nanoparticles, which can take into account the influence of nanoparticles on flow field distribution and improve the transportation efficiency of nanoparticles. Summary of the invention

[0005] In view of this, it is necessary to provide a method for designing a pneumatic lens structure for strong laser irradiation of nanoparticles, so as to solve the technical problem in the prior art that the influence of nanoparticles is ignored or simplified to a constant, resulting in low nanoparticle transport efficiency of the pneumatic lens.

[0006] On the one hand, in order to solve the above technical problems, the present invention provides a method for designing an aerodynamic lens structure for irradiating nanoparticles with strong laser, comprising:

[0007] Construct a fluid dynamics model of the carrier gas in the pneumatic lens and a discrete element model of the nanoparticles;

[0008] defining initial carrier gas parameters of the carrier gas, initial particle parameters of the nanoparticles, and an iteration termination condition;

[0009] In a new time step, determining a carrier gas update parameter based on the fluid mechanics model and the initial carrier gas parameter, and determining a particle update parameter based on the discrete element model and the initial particle parameter;

[0010] Determining the mutual influence between the carrier gas and the nanoparticles, and adjusting the carrier gas update parameter based on the mutual influence and the particle update parameter to obtain a carrier gas adjustment parameter;

[0011] When the iteration termination condition is met, the design parameters of the aerodynamic lens are determined based on the carrier gas adjustment parameters.

[0012] In a possible implementation, the mutual influence between the carrier gas and the nanoparticles includes a first influence of the carrier gas on the nanoparticles and a second influence of the nanoparticles on the carrier gas, and determining the mutual influence between the carrier gas and the nanoparticles, and adjusting the carrier gas update parameter based on the mutual influence and the particle update parameter to obtain the carrier gas adjustment parameter includes:

[0013] Applying the first influence to the nanoparticles to adjust the particle renewal parameter to obtain a particle adjustment parameter;

[0014] The carrier gas update parameter is adjusted based on the particle adjustment parameter and the second influence to obtain the carrier gas adjustment parameter.

[0015] In a possible implementation, the initial carrier gas parameters include an initial carrier gas velocity field and an initial carrier gas pressure field, the initial particle parameters include an initial particle position and an initial particle velocity, and the iteration termination condition is an iteration duration.

[0016] In a possible implementation, the fluid mechanics model is:

[0017]

[0018]

[0019]

[0020] In the formula, is the volume of carrier gas in the calculation unit; is the density of the carrier gas; is the carrier gas velocity; is the pressure on the calculation unit; is the carrier gas viscous stress tensor; is the acceleration due to gravity; is the interaction force between the carrier gas and the nanoparticles; is the volume of the calculation unit; is the drag force; is the virtual mass force; for Magnus Force; n is the total number of computing units.

[0021] In a possible implementation, the discrete element model is:

[0022]

[0023]

[0024]

[0025]

[0026] In the formula, is the mass of nanoparticle i; is the acceleration of nanoparticle i; is the volume of nanoparticle i; is the normal force of other nanoparticles on nanoparticle i; is the moment of inertia of nanoparticle i; is the rotational acceleration of nanoparticle i; is the tangential external force acting on nanoparticle i; is the tangential force of other nanoparticles on nanoparticle i; is the normal stiffness coefficient; is the normal damping coefficient; is the normal relative displacement; is the rate of normal displacement; is the tangential stiffness coefficient; is the tangential damping coefficient; is the tangential relative displacement; is the velocity of tangential displacement.

[0027] In a possible implementation, the fluid mechanics model and the discrete element model both include empirical parameters and parameters to be determined. Then, before determining the carrier gas update parameters based on the fluid mechanics model and the initial carrier gas parameters in the new time step, the method further includes:

[0028] Determine the empirical parameters based on literature, and determine the parameters to be measured based on sand pile experiments and / or wind tunnel experiments;

[0029] The parameters to be measured include interaction parameters between nanoparticles, interaction parameters between nanoparticles and the pneumatic lens cavity, and interaction parameters between nanoparticles and carrier gas.

[0030] In a possible implementation, the method for designing an aerodynamic lens structure for irradiating nanoparticles with a strong laser also includes:

[0031] Determining reference parameters corresponding to the empirical parameters based on the wind tunnel experiment;

[0032] When the empirical parameter is inconsistent with the reference parameter, the reference parameter is used as the empirical parameter.

[0033] On the other hand, the present invention also provides a device for designing an aerodynamic lens structure for irradiating nanoparticles with strong laser, comprising:

[0034] A model building unit, used to build a fluid mechanics model of the carrier gas in the pneumatic lens and a discrete element model of the nanoparticles;

[0035] A parameter definition unit, used to define initial carrier gas parameters of the carrier gas, initial particle parameters of the nanoparticles, and an iteration termination condition;

[0036] A parameter updating unit, configured to determine, within a new time step, a carrier gas update parameter based on the fluid mechanics model and the initial carrier gas parameter, and a particle update parameter based on the discrete element model and the initial particle parameter;

[0037] a parameter adjustment unit, configured to determine the mutual influence between the carrier gas and the nanoparticles, and adjust the carrier gas update parameter based on the mutual influence and the particle update parameter to obtain a carrier gas adjustment parameter;

[0038] The design parameter determination unit is used to determine the design parameters of the aerodynamic lens based on the carrier gas adjustment parameters when the iteration termination condition is met.

[0039] On the other hand, the present invention also provides a pneumatic lens for designing a pneumatic lens structure based on the pneumatic lens structure design method for irradiating nanoparticles with strong laser, and the pneumatic lens structure design method for irradiating nanoparticles with strong laser is the pneumatic lens structure design method for irradiating nanoparticles with strong laser described in any one of the possible implementation methods mentioned above.

[0040] On the other hand, the present invention also provides a structural design system, including a memory and a processor, wherein:

[0041] The memory is used to store programs;

[0042] The processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps in the method for designing an aerodynamic lens structure for irradiating nanoparticles with strong laser light as described in any one of the possible implementations above.

[0043] The beneficial effects of the present invention are as follows: the method for designing a pneumatic lens structure for high-intensity laser irradiation of nanoparticles provided by the present invention, by constructing a fluid mechanics model of a carrier gas and a discrete element model of nanoparticles, realizes that in the process of designing the pneumatic lens structure, in addition to considering the fluid behavior of the carrier gas as a fluid, the particle movement of the nanoparticles is also considered. Compared with the prior art which considers a single fluid behavior, the aggregation of nanoparticles in the pneumatic lens cavity is avoided, the reliability of the determined pneumatic lens structure design parameters can be improved, and the transportation efficiency of the nanoparticles in the pneumatic lens is thereby improved.

[0044] Furthermore, when determining the design parameters of the pneumatic lens, the present invention also determines the mutual influence between the carrier gas and the nanoparticles, that is, the mutual coupling and mutual correlation between the carrier gas and the nanoparticles are taken into account, thereby further improving the transportation efficiency of the nanoparticles. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 A schematic flow chart of an embodiment of a method for designing an aerodynamic lens structure for irradiating nanoparticles with a strong laser provided by the present invention;

[0047] Figure 2 For the present invention Figure 1 A schematic flow chart of an embodiment of S104;

[0048] Figure 3 A schematic diagram of a flow chart of an embodiment of adjusting parameters provided by the present invention;

[0049] Figure 4 A schematic diagram of an embodiment of the pneumatic lens structure design device for high-intensity laser irradiation of nanoparticles provided by the present invention;

[0050] Figure 5 A schematic diagram of the structure of an embodiment of the structural design system provided by the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0052] It should be understood that the schematic drawings are not drawn to scale. The flowchart used in the present invention shows the operations implemented according to some embodiments of the present invention. It should be understood that the operations of the flowchart can be implemented out of order, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art, under the guidance of the content of the present invention, can add one or more other operations to the flowchart, and can also remove one or more operations from the flowchart. Some of the block diagrams shown in the accompanying drawings are functional entities, which do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor systems and / or microcontroller systems.

[0053] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] Figure 1 A schematic flow chart of an embodiment of the method for designing an aerodynamic lens structure for irradiating nanoparticles with strong laser provided by the present invention is shown in FIG. Figure 1 As shown, the method for designing the aerodynamic lens structure for irradiating nanoparticles with strong laser light includes:

[0055] S101, constructing a fluid dynamics model of the carrier gas in the pneumatic lens and a discrete element model of the nanoparticles;

[0056] S102, defining initial carrier gas parameters of the carrier gas, initial particle parameters of the nanoparticles, and an iteration termination condition;

[0057] S103, within the new time step, determining a carrier gas update parameter based on the fluid mechanics model and the initial carrier gas parameter, and determining a particle update parameter based on the discrete element model and the initial particle parameter;

[0058] S104, determining the mutual influence between the carrier gas and the nanoparticles, and adjusting the carrier gas update parameter based on the mutual influence and the particle update parameter to obtain the carrier gas adjustment parameter;

[0059] S105 . When the iteration termination condition is met, the design parameters of the pneumatic lens are determined based on the carrier gas adjustment parameters.

[0060] The carrier gas in step S101 may be any one of neon, argon, nitrogen, etc. The new time step in step S103 refers to a preset iteration time interval.

[0061] It should be noted that: when the iteration termination condition is not met, the process may return to step S103 to calculate the next new time step, that is, t=t+dt, where dt is the time step.

[0062] Compared with the prior art, the method for designing a pneumatic lens structure for high-intensity laser irradiation of nanoparticles provided in an embodiment of the present invention, by constructing a fluid mechanics model of a carrier gas and a discrete element model of nanoparticles, realizes that in the process of designing the pneumatic lens structure, in addition to considering the fluid behavior of the carrier gas as a fluid, the particle motion of the nanoparticles is also considered. Compared with the prior art which only considers the fluid behavior, the aggregation of nanoparticles in the pneumatic lens cavity is avoided, the reliability of the determined pneumatic lens structure design parameters can be improved, and the transportation efficiency of nanoparticles in the pneumatic lens is thereby improved.

[0063] Furthermore, when determining the design parameters of the pneumatic lens, the embodiment of the present invention also determines the mutual influence between the carrier gas and the nanoparticles, that is, the mutual coupling and mutual correlation between the carrier gas and the nanoparticles are taken into account, thereby further improving the transportation efficiency of the nanoparticles.

[0064] In some embodiments of the present invention, the mutual influence between the carrier gas and the nanoparticles includes a first influence of the carrier gas on the nanoparticles and a second influence of the nanoparticles on the carrier gas. Figure 2 As shown, step S104 includes:

[0065] S201, applying a first influence to the nanoparticles to adjust the particle update parameters to obtain particle adjustment parameters;

[0066] S202 , adjusting the carrier gas update parameter based on the particle adjustment parameter and the second influence to obtain the carrier gas adjustment parameter.

[0067] The embodiments of the present invention more comprehensively evaluate the interaction between the carrier gas and the nanoparticles in the pneumatic lens by considering the influence of the carrier gas on the nanoparticles and the influence of the nanoparticles on the carrier gas, thereby further improving the rationality of the pneumatic lens structure design.

[0068] It should be understood that the premise of analyzing the fluid mechanics model is grid division. Therefore, in a specific embodiment of the present invention, the aerodynamic lens can be divided into multiple grid units, and each grid unit is calculated based on the fluid mechanics model and the discrete element model.

[0069] Specifically, the first influence is applied to the nanoparticles, the particle adjustment parameters are calculated by a differential algorithm, the momentum exchange data is updated based on the particle adjustment parameters, and the carrier gas adjustment parameters are obtained based on the updated momentum exchange data, that is, the movement of the carrier gas under the influence of the nanoparticles is obtained.

[0070] In some embodiments of the present invention, the initial carrier gas parameters include the initial carrier gas velocity field and the initial carrier gas pressure field, the initial particle parameters include the initial particle position and the initial particle velocity, and the iteration termination condition is the iteration duration.

[0071] The determination of whether the iteration termination condition is met in step S105 is specifically as follows: determining whether the running time reaches the iteration time; if so, the iteration termination condition is met.

[0072] In some embodiments of the present invention, the fluid mechanics model includes a fluid continuity equation, a fluid momentum equation, and a fluid momentum exchange equation. Specifically, the fluid continuity equation is:

[0073]

[0074] The momentum equation for the fluid is:

[0075]

[0076] The fluid momentum exchange equation is:

[0077]

[0078] In the formula, is the volume of carrier gas in the calculation unit; is the density of the carrier gas; is the carrier gas velocity; is the pressure on the calculation unit; is the carrier gas viscous stress tensor; is the acceleration due to gravity; is the interaction force between the carrier gas and the nanoparticles; is the volume of the calculation unit; is the drag force; is the virtual mass force; for Magnus Force; n is the total number of computing units.

[0079] The calculation unit refers to the grid unit obtained by each division.

[0080] The drag force refers to the resistance of the fluid to the particles moving in it, which is the main part of the momentum exchange between the carrier gas and the nanoparticles. The expression of the drag force is:

[0081]

[0082] In the formula, is the dimensionless drag coefficient, which depends on the shape of the object, surface roughness, and Reynolds number; is the velocity of the nanoparticle relative to the fluid; is the cross-sectional area of ​​the nanoparticle.

[0083] The virtual mass mainly considers the shape of nanoparticles and fluid properties. Specifically, the expression of virtual mass force is:

[0084]

[0085] In the formula, is the virtual mass coefficient, which depends on the shape of the particle and the properties of the fluid; is the volume of the nanoparticle; is the acceleration of the nanoparticle.

[0086] The Magnus force describes the force generated when particles rotate in a fluid. Because particles will have a higher flow rate on one side and a lower flow rate on the other side during rotation, according to the Bernoulli principle, a lateral force will be generated to deflect the particle's motion path. The expression of the Magnus force is:

[0087]

[0088] In the formula, is the fluid circulation volume generated by the rotation of nanoparticles.

[0089] In some embodiments of the present invention, the discrete element model includes a translation equation and a rotation equation of the solid nanoparticle. Specifically, the translation equation is:

[0090]

[0091]

[0092] The rotation equation is:

[0093]

[0094]

[0095] In the formula, is the mass of nanoparticle i; is the acceleration of nanoparticle i; is the volume of nanoparticle i; is the normal force of other nanoparticles on nanoparticle i; is the moment of inertia of nanoparticle i; is the rotational acceleration of nanoparticle i; is the tangential external force acting on nanoparticle i; is the tangential force of other nanoparticles on nanoparticle i; is the normal stiffness coefficient; is the normal damping coefficient; is the normal relative displacement; is the rate of normal displacement; is the tangential stiffness coefficient; is the tangential damping coefficient; is the tangential relative displacement; is the velocity of tangential displacement.

[0096] From the fluid mechanics model and the discrete element model, it can be seen that the fluid momentum exchange equation and the translation equation both include drag force, virtual mass force and Magnus force. Therefore, the fluid momentum exchange equation can be used as the key point of coupling between the discrete element model and the fluid mechanics model.

[0097] Specifically, based on the fluid mechanics model, momentum exchange (i.e., the force exerted by the carrier gas on the nanoparticles) can be obtained. Then, within a certain period of time, discrete element calculations can be performed based on the discrete element model to obtain momentum exchange (i.e., the influence of the nanoparticles on the carrier gas). Then, based on this momentum exchange, fluid mechanics can be calculated to obtain the movement of the carrier gas under the influence of the nanoparticles.

[0098] It can be seen from the above formula that the fluid mechanics model and the discrete element model include many parameters, some of which are available from literature, and some of which need to be determined experimentally. Therefore, in some embodiments of the present invention, the parameters in the fluid mechanics model and the discrete element model are divided into empirical parameters and parameters to be determined. Then, before step S103, the following is also included:

[0099] Determine empirical parameters based on literature, and determine parameters to be measured based on sand pile experiments and / or wind tunnel experiments;

[0100] The parameters to be measured include interaction parameters between nanoparticles, interaction parameters between nanoparticles and the pneumatic lens cavity, and interaction parameters between nanoparticles and carrier gas.

[0101] In a specific embodiment of the present invention, the parameters in the fluid mechanics model and the discrete element model and the means for obtaining the parameters are shown in Table 1:

[0102] Table 1 Model parameters and sources

[0103]

[0104]

[0105] The calculation in Table 1 refers to the parameters that can be determined by other parameters, that is, there is a corresponding relationship between this parameter and other parameters determined by literature or experiments.

[0106] Among them, the interaction parameters between nanoparticles include normal stiffness coefficient, normal damping coefficient, tangential stiffness coefficient and tangential damping coefficient.

[0107] The interaction parameters between nanoparticles are determined by the sand pile experiment as follows: first, a certain amount of nanoparticles is evenly poured onto a flat and smooth surface, and the height of the pouring point is slowly raised until the particles begin to disperse naturally. After the particles stop flowing, a high-precision inclinometer is used to measure the stacking angle of the pile. The size of the stacking angle can reflect the interaction strength between particles, including the effects of stiffness and damping.

[0108] It should be noted that the discrete element model can also consider the interaction parameters between the nanoparticles and the pneumatic lens cavity. Similarly, the interaction parameters between the nanoparticles and the pneumatic lens cavity also include the tangential and normal stiffness coefficients and damping coefficients. The interaction parameters between the nanoparticles and the pneumatic lens cavity are determined by the sand pile experiment as follows:

[0109] First, in a precisely controlled experimental environment, a certain amount of nanoparticles is evenly sprinkled on a horizontal stainless steel plate. By slowly tilting the stainless steel plate, the particles begin to move along the plate surface until they stop. At this time, the maximum tilt angle between the plate surface and the horizontal plane is measured, which is the maximum tilt angle. The measurement of this angle requires the use of precise angle measuring instruments, such as digital inclinometers. Various environmental factors, such as temperature, humidity, and uniformity of particles, should be controlled in the experiment. By analyzing the changes in the maximum tilt angle under different conditions, combined with theoretical models and known material properties, the stiffness and damping coefficient between the particles and the stainless steel plate can be calculated. In addition, repeating the experiment to ensure the repeatability and reliability of the results is a key part of the experimental design. Through the comprehensive analysis of the maximum tilt angle data, the mechanical properties of the interaction between nanoparticles and stainless steel plates can be effectively estimated.

[0110] Among them, the interaction parameters between nanoparticles and carrier gas are determined based on wind tunnel tests as follows: First, a wind tunnel facility is prepared in which neon gas is used as the working fluid. Nanoparticles of known size and mass are evenly dispersed in the test section of the wind tunnel. A high-speed camera and a particle image velocimeter (PIV) are used to capture the motion trajectory and velocity field of nanoparticles in the neon gas flow. The airflow force on the particle pile, the transport and dispersion characteristics of the particles, and the influence of the airflow velocity on the morphology of the sand pile are measured, and finally the interaction parameters between the nanoparticles and the carrier gas are determined.

[0111] Since some parameters learned from the literature may be inaccurate due to incompatibility with the current scene or other various factors, in order to solve this technical problem, in some embodiments of the present invention, such as Figure 3 As shown, the method for designing the aerodynamic lens structure for irradiating nanoparticles with strong laser light also includes:

[0112] S301, determining reference parameters corresponding to empirical parameters based on wind tunnel experiments;

[0113] S302: When the empirical parameter is inconsistent with the reference parameter, the reference parameter is used as the empirical parameter.

[0114] The embodiment of the present invention verifies and replaces the empirical parameters by using reference parameters obtained through wind tunnel experiments, which can effectively determine and optimize the key parameters in the design process of the aerodynamic lens structure for irradiating nanoparticles with strong lasers, thereby improving the rationality of the designed aerodynamic lens.

[0115] In order to better implement the method for designing a pneumatic lens structure for irradiating nanoparticles with strong laser in the embodiment of the present invention, based on the method for designing a pneumatic lens structure for irradiating nanoparticles with strong laser, the embodiment of the present invention also provides a device for designing a pneumatic lens structure for irradiating nanoparticles with strong laser, such as Figure 4 As shown, the pneumatic lens structure design device 400 for irradiating nanoparticles with strong laser light comprises:

[0116] A model building unit 401 is used to build a fluid mechanics model of the carrier gas in the pneumatic lens and a discrete element model of the nanoparticles;

[0117] A parameter definition unit 402, used to define initial carrier gas parameters of the carrier gas, initial particle parameters of the nanoparticles, and an iteration termination condition;

[0118] A parameter updating unit 403 is used to determine, within a new time step, a carrier gas update parameter based on a fluid mechanics model and initial carrier gas parameters, and to determine a particle update parameter based on a discrete element model and initial particle parameters;

[0119] A parameter adjustment unit 404 is used to determine the mutual influence between the carrier gas and the nanoparticles, and adjust the carrier gas update parameter based on the mutual influence and the particle update parameter to obtain the carrier gas adjustment parameter;

[0120] The design parameter determination unit 405 is used to determine the design parameters of the aerodynamic lens based on the carrier gas adjustment parameters when the iteration termination condition is met.

[0121] The device 400 for designing a pneumatic lens structure for irradiating nanoparticles with strong laser provided in the above embodiment can realize the technical solution described in the embodiment of the method for designing a pneumatic lens structure for irradiating nanoparticles with strong laser. The specific implementation principles of the above modules or units can be found in the corresponding contents in the embodiment of the method for designing a pneumatic lens structure for irradiating nanoparticles with strong laser, which will not be repeated here.

[0122] An embodiment of the present invention further provides a pneumatic lens, wherein the pneumatic lens is designed based on a pneumatic lens structure design method for irradiating nanoparticles with strong laser, and the pneumatic lens structure design method for irradiating nanoparticles with strong laser is the pneumatic lens structure design method for irradiating nanoparticles with strong laser in any of the above embodiments.

[0123] like Figure 5 As shown, the present invention also provides a structural design system 500. The structural design system 500 includes a processor 501, a memory 502 and a display 503. Figure 5 Only some of the components of the structural design system 500 are shown, but it should be understood that implementing all of the shown components is not a requirement, and more or fewer components may alternatively be implemented.

[0124] In some embodiments, the processor 501 may be a central processing unit (CPU), a microprocessor or other data processing chip, used to run program codes or process data stored in the memory 502, such as the aerodynamic lens structure design method for high-intensity laser irradiation of nanoparticles in the present invention.

[0125] In some embodiments, the processor 501 may be a single server or a server group. The server group may be centralized or distributed. In some embodiments, the processor 501 may be local or remote. In some embodiments, the processor 501 may be implemented in a cloud platform. In one embodiment, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, a multi-cloud, etc., or any combination thereof.

[0126] In some embodiments, the memory 502 may be an internal storage unit of the structural design system 500, such as a hard disk or memory of the structural design system 500. In other embodiments, the memory 502 may also be an external storage device of the structural design system 500, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc., equipped on the structural design system 500.

[0127] Furthermore, the memory 502 may include both an internal storage unit of the structure design system 500 and an external storage device. The memory 502 is used to store application software of the structure design system 500 and various data.

[0128] In some embodiments, the display 503 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, etc. The display 503 is used to display information of the structural design system 500 and to display a visual user interface. The components 501-503 of the structural design system 500 communicate with each other via a system bus.

[0129] In some embodiments of the present invention, when the processor 501 executes the aerodynamic lens structure design program for irradiating nanoparticles with strong laser light in the memory 502, the following steps may be implemented:

[0130] Construct a fluid dynamics model of the carrier gas in the pneumatic lens and a discrete element model of the nanoparticles;

[0131] defining initial carrier gas parameters of the carrier gas, initial particle parameters of the nanoparticles, and iteration termination conditions;

[0132] In the new time step, a carrier gas update parameter is determined based on the fluid mechanics model and the initial carrier gas parameter, and a particle update parameter is determined based on the discrete element model and the initial particle parameter;

[0133] Determining the mutual influence between the carrier gas and the nanoparticles, and adjusting the carrier gas update parameter based on the mutual influence and the particle update parameter to obtain the carrier gas adjustment parameter;

[0134] When the iteration termination condition is met, the design parameters of the aerodynamic lens are determined based on the carrier gas adjustment parameters.

[0135] It should be understood that: when the processor 501 executes the aerodynamic lens structure design program for high-intensity laser irradiation of nanoparticles in the memory 502, in addition to the above functions, other functions can also be realized. For details, please refer to the description of the corresponding method embodiment above.

[0136] Furthermore, the embodiment of the present invention does not specifically limit the type of the structural design system 500 mentioned. The structural design system 500 may be a portable structural design system such as a mobile phone, a tablet computer, a personal digital assistant (PDA), a wearable device, a laptop computer, etc. Exemplary embodiments of portable structural design systems include but are not limited to portable structural design systems equipped with IOS, Android, Microsoft or other operating systems. The above-mentioned portable structural design system may also be other portable structural design systems. It should also be understood that in some other embodiments of the present invention, the structural design system 500 may not be a portable structural design system, but a desktop computer with a touch-sensitive surface (such as a touch panel).

[0137] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware (such as a processor, a controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0138] The above is a detailed introduction to the method for designing an aerodynamic lens structure for irradiating nanoparticles with strong laser provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for designing an aerodynamic lens structure for irradiating nanoparticles with strong laser, characterized in that: include: Construct a fluid dynamics model of the carrier gas in the pneumatic lens and a discrete element model of the nanoparticles; defining initial carrier gas parameters of the carrier gas, initial particle parameters of the nanoparticles, and an iteration termination condition; In a new time step, determining a carrier gas update parameter based on the fluid mechanics model and the initial carrier gas parameter, and determining a particle update parameter based on the discrete element model and the initial particle parameter; Determining the mutual influence between the carrier gas and the nanoparticles, and adjusting the carrier gas update parameter based on the mutual influence and the particle update parameter to obtain a carrier gas adjustment parameter; When the iteration termination condition is met, determining the design parameters of the pneumatic lens based on the carrier gas adjustment parameters; The mutual influence between the carrier gas and the nanoparticles includes a first influence of the carrier gas on the nanoparticles and a second influence of the nanoparticles on the carrier gas. Then, determining the mutual influence between the carrier gas and the nanoparticles, and adjusting the carrier gas update parameter based on the mutual influence and the particle update parameter to obtain the carrier gas adjustment parameter includes: Applying the first influence to the nanoparticles to adjust the particle renewal parameter to obtain a particle adjustment parameter; The carrier gas update parameter is adjusted based on the particle adjustment parameter and the second influence to obtain the carrier gas adjustment parameter.

2. The method for designing an aerodynamic lens structure for high-intensity laser irradiation of nanoparticles according to claim 1, characterized in that: The initial carrier gas parameters include an initial carrier gas velocity field and an initial carrier gas pressure field, the initial particle parameters include an initial particle position and an initial particle velocity, and the iteration termination condition is the iteration duration.

3. The method for designing an aerodynamic lens structure for high-intensity laser irradiation of nanoparticles according to claim 1, characterized in that: The fluid mechanics model is: In the formula, is the volume of carrier gas in the calculation unit; is the density of the carrier gas; is the carrier gas velocity; is the pressure on the calculation unit; is the carrier gas viscous stress tensor; is the acceleration due to gravity; is the interaction force between the carrier gas and the nanoparticles; is the volume of the calculation unit; is the drag force; is the virtual mass force; for Magnus Force; n is the total number of computing units.

4. The method for designing an aerodynamic lens structure for high-intensity laser irradiation of nanoparticles according to claim 3, characterized in that: The discrete element model is: In the formula, is the mass of nanoparticle i; is the acceleration of nanoparticle i; is the volume of nanoparticle i; is the normal force of other nanoparticles on nanoparticle i; is the moment of inertia of nanoparticle i; is the rotational acceleration of nanoparticle i; is the tangential external force acting on nanoparticle i; is the tangential force of other nanoparticles on nanoparticle i; is the normal stiffness coefficient; is the normal damping coefficient; is the normal relative displacement; is the rate of normal displacement; is the tangential stiffness coefficient; is the tangential damping coefficient; is the tangential relative displacement; is the velocity of tangential displacement.

5. The method for designing an aerodynamic lens structure for high-intensity laser irradiation of nanoparticles according to claim 1, characterized in that: The fluid mechanics model and the discrete element model both include empirical parameters and parameters to be determined. Therefore, before determining the carrier gas update parameters based on the fluid mechanics model and the initial carrier gas parameters in the new time step, the method further includes: Determine the empirical parameters based on literature, and determine the parameters to be measured based on sand pile experiments and / or wind tunnel experiments; The parameters to be measured include interaction parameters between nanoparticles, interaction parameters between nanoparticles and the pneumatic lens cavity, and interaction parameters between nanoparticles and carrier gas.

6. The method for designing an aerodynamic lens structure for high-intensity laser irradiation of nanoparticles according to claim 5, characterized in that: The method for designing an aerodynamic lens structure for irradiating nanoparticles with strong laser light also includes: Determining reference parameters corresponding to the empirical parameters based on the wind tunnel experiment; When the empirical parameter is inconsistent with the reference parameter, the reference parameter is used as the empirical parameter.

7. A pneumatic lens structure design device for high-intensity laser irradiation of nanoparticles, characterized in that: include: A model building unit, used to build a fluid mechanics model of the carrier gas in the pneumatic lens and a discrete element model of the nanoparticles; A parameter definition unit, used to define initial carrier gas parameters of the carrier gas, initial particle parameters of the nanoparticles, and an iteration termination condition; A parameter updating unit, configured to determine, within a new time step, a carrier gas update parameter based on the fluid mechanics model and the initial carrier gas parameter, and a particle update parameter based on the discrete element model and the initial particle parameter; a parameter adjustment unit, configured to determine the mutual influence between the carrier gas and the nanoparticles, and adjust the carrier gas update parameter based on the mutual influence and the particle update parameter to obtain a carrier gas adjustment parameter; A design parameter determination unit, configured to determine the design parameters of the aerodynamic lens based on the carrier gas adjustment parameters when the iteration termination condition is met; The mutual influence between the carrier gas and the nanoparticles includes a first influence of the carrier gas on the nanoparticles and a second influence of the nanoparticles on the carrier gas. Then, determining the mutual influence between the carrier gas and the nanoparticles, and adjusting the carrier gas update parameter based on the mutual influence and the particle update parameter to obtain the carrier gas adjustment parameter includes: Applying the first influence to the nanoparticles to adjust the particle renewal parameter to obtain a particle adjustment parameter; The carrier gas update parameter is adjusted based on the particle adjustment parameter and the second influence to obtain the carrier gas adjustment parameter.

8. An aerodynamic lens, characterized in that: Used for designing an aerodynamic lens structure based on the strong laser irradiation of nanoparticles, the aerodynamic lens structure design method for strong laser irradiation of nanoparticles is the aerodynamic lens structure design method for strong laser irradiation of nanoparticles as described in any one of claims 1-6.

9. A structural design system, characterized in that: comprising a memory and a processor, wherein: The memory is used to store programs; The processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps in the method for designing an aerodynamic lens structure for irradiating nanoparticles with strong laser light as described in any one of claims 1 to 6.

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