CN115809491A - Deposition analysis method and device for particles in nuclear power field - Google Patents
Deposition analysis method and device for particles in nuclear power field Download PDFInfo
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Abstract
The invention provides a method and a device for sediment analysis of particles in the nuclear power field, which can accurately analyze the movement and the sedimentation process of the particles by simulating and calculating the speed and the position of the particles in the fluid in a nuclear power assembly at each sampling moment through a computer aided engineering technology, effectively help nuclear power engineering personnel to analyze the evolution behavior of the particles in the nuclear power operation process and accurately predict the particle sediment, thereby being beneficial to timely maintenance of the nuclear power assembly and having great industrial prediction and application values.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a method and a device for sediment analysis of particles in the nuclear power field.
Background
With the development of nuclear power technology, the safety of nuclear power operation is more and more emphasized by people. In the actual nuclear power operation process, particulate matters possibly deposit in components such as pipelines. The deposited particles can cause damage such as chemical corrosion, physical abrasion and the like to the components, and the safety of nuclear power operation is influenced.
However, the movement and deposition of particles inside components such as pipelines in the nuclear power field are difficult to directly observe or through experimental measurement, so that nuclear power engineering personnel cannot effectively predict the deposition of the particles, and further cannot timely maintain the deposition.
Disclosure of Invention
In view of this, the invention provides a method and a device for analyzing deposition of particulate matter in the nuclear power field, which can accurately analyze the operation and deposition process of particulate matter in fluid inside a nuclear power component, and realize accurate prediction of particulate matter deposition.
In order to achieve the above purpose, the invention provides the following specific technical scheme:
in a first aspect, an embodiment of the present invention provides a deposition analysis method for particulate matter in the nuclear power field, including:
acquiring a geometric model of a nuclear power assembly, and initializing parameters of a fluid at an inlet of the nuclear power assembly and parameters of at least one particulate matter, wherein the parameters of the fluid at least comprise a speed, and the parameters of the particulate matter at least comprise a speed and a position;
calculating flow field information of the current sampling moment based on a pre-constructed lattice Boltzmann model and parameters of the fluid at the last sampling moment, wherein the flow field information comprises the speed of the fluid;
calculating the stress and acceleration of the particles at the last sampling moment according to the speed of the fluid and the parameters of the particles at the last sampling moment;
calculating the speed and the position of the particulate matter at the current sampling moment according to the acceleration, the speed and the position of the particulate matter at the last sampling moment and a geometric model of the nuclear power assembly;
and determining whether the particulate matter is deposited or not based on the speed and the position of the particulate matter at each sampling moment.
In some embodiments, the calculating flow field information of the current sampling time based on the pre-constructed lattice boltzmann model and the parameter of the fluid at the last sampling time includes:
and inputting the parameters of the fluid at the last sampling moment into a pre-constructed lattice Boltzmann model for processing to obtain the flow field information of the current sampling moment output by the lattice Boltzmann model, wherein the flow field information comprises the speed and the pressure of the fluid, and the parameters of the fluid at the initial sampling moment are initialization parameters of the fluid at the inlet of the nuclear power assembly.
In some embodiments, said calculating the force and acceleration of the particles at the last sampling instant as a function of the velocity of the fluid and the parameters of the particles at the last sampling instant comprises:
calculating the drag force borne by the particulate matter at the last sampling moment according to the speed of the fluid, the speed and the volume of the particulate matter at the last sampling moment;
calculating the buoyancy force borne by the particles at the last sampling moment according to the density of the fluid, the density and the volume of the particles;
and calculating the acceleration of the particulate matter at the last sampling moment based on the drag force and buoyancy of the particulate matter at the last sampling moment and the mass of the particulate matter.
In some embodiments, the calculating the speed and the position of the particulate matter at the current sampling time according to the acceleration, the speed and the position of the particulate matter at the last sampling time and the geometric model of the nuclear power assembly includes:
calculating the estimated speed of the particulate matter at the current sampling moment according to the speed and the acceleration of the particulate matter at the previous sampling moment;
calculating the estimated position of the particulate matter at the current sampling moment according to the position of the particulate matter at the last sampling moment and the estimated speed of the particulate matter at the current sampling moment;
judging whether the estimated position of the particulate matter at the current sampling moment is in the nuclear power assembly or not according to the geometric model of the nuclear power assembly;
if the particle is in the nuclear power assembly, respectively determining the estimated speed and the estimated position of the particle at the current sampling moment as the speed and the position of the particle at the current sampling moment, and recording the speed and the position of the particle at the current sampling moment;
if the particles are not in the nuclear power assembly, determining that the particles collide with the nuclear power assembly;
determining the specular reflection direction of the speed direction of the particulate matter at the previous sampling moment as the speed direction of the particulate matter at the current sampling moment, and calculating the speed of the particulate matter after collision according to the estimated speed and the recovery coefficient of the particulate matter at the current sampling moment;
and determining the speed of the particles after collision as the speed of the particles at the current sampling moment, calculating the position of the particles at the current sampling moment according to the speed of the particles after collision, and recording the speed and the position of the particles at the current sampling moment.
In some embodiments, the determining whether the particulate matter is deposited based on the speed and the position of the particulate matter at each sampling time comprises:
judging whether a preset termination condition is reached;
if the preset termination condition is met, terminating sampling, and outputting flow field information recorded at each sampling moment and the speed and the position of the particulate matters;
drawing the motion trail of the particulate matters according to the speed and the position of the particulate matters at each sampling moment;
and determining whether the particles are deposited or not according to the motion trail of the particles, and determining the position of the particle deposition.
In a second aspect, an embodiment of the present invention provides a deposition analysis apparatus for particulate matter in a nuclear power field, including:
the system comprises an initialization unit, a calculation unit and a control unit, wherein the initialization unit is used for acquiring a geometric model of a nuclear power assembly and initializing parameters of a fluid at an inlet of the nuclear power assembly and parameters of at least one particulate matter, the parameters of the fluid at least comprise a speed, and the parameters of the particulate matter at least comprise a speed and a position;
the flow field information calculation unit is used for calculating the flow field information of the current sampling moment based on a pre-constructed lattice Boltzmann model and the parameters of the fluid at the last sampling moment, and the flow field information comprises the speed of the fluid;
the particle stress calculation unit is used for calculating the stress and the acceleration of the particles at the last sampling moment according to the speed of the fluid and the parameters of the particles at the last sampling moment;
the speed and position calculation unit is used for calculating the speed and the position of the particulate matter at the current sampling moment according to the acceleration, the speed and the position of the particulate matter at the last sampling moment and the geometric model of the nuclear power assembly;
and the deposition analysis unit is used for determining whether the particulate matters are deposited or not based on the speed and the position of the particulate matters at each sampling moment.
In some embodiments, the flow field information calculating unit is specifically configured to input the parameter of the fluid at the last sampling time into a lattice boltzmann model that is constructed in advance for processing, so as to obtain the flow field information of the current sampling time output by the lattice boltzmann model, where the flow field information includes a speed and a pressure of the fluid, and the parameter of the fluid at the initial sampling time is an initialization parameter of the fluid at the inlet of the nuclear power assembly.
In some embodiments, the particle force calculation unit is specifically configured to:
calculating the drag force borne by the particulate matter at the last sampling moment according to the speed of the fluid, the speed and the volume of the particulate matter at the last sampling moment;
calculating the buoyancy force borne by the particles at the last sampling moment according to the density of the fluid, the density and the volume of the particles;
and calculating the acceleration of the particles at the last sampling moment based on the drag force, the buoyancy and the mass of the particles on the particles at the last sampling moment.
In some embodiments, the speed position calculation unit is specifically configured to:
calculating the estimated speed of the particulate matter at the current sampling moment according to the speed and the acceleration of the particulate matter at the last sampling moment;
calculating the estimated position of the particulate matter at the current sampling moment according to the position of the particulate matter at the last sampling moment and the estimated speed of the particulate matter at the current sampling moment;
judging whether the position of the particulate matter at the current sampling moment is in the nuclear power assembly or not according to the geometric model of the nuclear power assembly;
if the particle is in the nuclear power assembly, respectively determining the estimated speed and the estimated position of the particle at the current sampling moment as the speed and the position of the particle at the current sampling moment, and recording the speed and the position of the particle at the current sampling moment;
if the particle is not in the nuclear power assembly, determining that the particle collides with the nuclear power assembly;
determining the specular reflection direction of the speed direction of the particulate matters at the last sampling moment as the speed direction of the particulate matters at the current sampling moment, and calculating the speed of the particulate matters after collision according to the estimated speed and the recovery coefficient of the particulate matters at the current sampling moment;
and determining the speed of the particles after collision as the speed of the particles at the current sampling moment, calculating the position of the particles at the current sampling moment according to the speed of the particles after collision, and recording the speed and the position of the particles at the current sampling moment.
In some embodiments, the deposition analysis unit is specifically configured to:
judging whether a preset termination condition is reached;
if the preset termination condition is met, terminating sampling, and outputting the flow field information recorded at each sampling moment and the speed and the position of the particulate matter;
drawing the motion trail of the particulate matters according to the speed and the position of the particulate matters at each sampling moment;
and determining whether the particulate matters are deposited or not according to the motion trail of the particulate matters, and determining the positions of the deposited particulate matters.
Compared with the prior art, the invention has the following beneficial effects:
according to the method and the device for analyzing the deposition of the particulate matters in the nuclear power field, disclosed by the invention, the speed and the position of the particulate matters in the fluid in the nuclear power component at each sampling moment are simulated and calculated through a computer aided engineering technology, so that the movement and the deposition process of the particulate matters can be accurately analyzed, nuclear power engineering practitioners are effectively helped to analyze the evolution behavior of the particulate matters in the nuclear power operation process, and the deposition of the particulate matters is accurately predicted, so that the nuclear power component is helped to be maintained in time, and the method and the device have great industrial prediction and application values.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic flow chart of a deposition analysis method of particulate matter in the nuclear power field according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a particulate matter and a conduit according to an embodiment of the disclosure;
FIG. 3 is a schematic diagram of a partial method flow of a deposition analysis method of particulate matter in the nuclear power field according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of a particle impact according to an embodiment of the present disclosure;
FIG. 5 is a schematic structural diagram of a deposition analysis apparatus for particulate matter in the nuclear power field according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The deposition analysis method of the particles in the nuclear power field disclosed by the embodiment of the invention can be applied to electronic equipment, such as desktop computers, mobile terminals, servers and other electronic equipment. The server may be one server, or a server cluster composed of a plurality of servers, or a cloud computing service center.
In order to facilitate understanding of those skilled in the art, the method for analyzing deposition of particulate matter in the nuclear power field provided by the embodiment of the invention can be applied to an application scenario. For example, a user, such as a nuclear power engineering practitioner, may input a geometric model of a nuclear power assembly in an electronic device, initialize parameters of a fluid at an inlet of the nuclear power assembly and parameters of at least one particulate matter, simulate and calculate a speed and a position of the particulate matter in the fluid inside the nuclear power assembly at each sampling time by the electronic device through a computer-aided engineering technology, and determine whether the particulate matter is deposited based on the speed and the position of the particulate matter at each sampling time.
Referring to fig. 1, the deposition analysis method for particles in the nuclear power field disclosed in this embodiment specifically includes the following steps:
s101: acquiring a geometric model of the nuclear power assembly, and initializing parameters of a fluid at an inlet of the nuclear power assembly and parameters of at least one particle;
the nuclear power assembly can be a pipeline and other assemblies, the fluid in the nuclear power assembly can be high-temperature high-pressure distilled water, and parameters of the fluid at least comprise speed which is the speed at an inlet of the nuclear power assembly and also comprises information such as temperature, viscosity, density and outlet pressure.
If a plurality of particles exist, parameters of each particle need to be initialized respectively, the parameters of the particles at least comprise speed and position, and also comprise information such as material properties, density, volume parameters and the like, the volume parameters can be diameter, radius or volume, and the particles are default ferroferric oxide particles.
By taking a cylindrical pipeline as an example shown in FIG. 2, an evolution process of movement and deposition of particulate matters in the pipeline during the flow of high-temperature high-pressure distilled water is simulated by acquiring a geometric model of the nuclear power assembly.
S102: calculating flow field information of the current sampling moment based on a pre-constructed lattice Boltzmann model and parameters of the fluid at the last sampling moment, wherein the flow field information comprises the speed of the fluid;
specifically, the parameters of the fluid at the last sampling moment are input into a pre-constructed lattice boltzmann model for processing, and flow field information of the current sampling moment output by the lattice boltzmann model is obtained, wherein the flow field information comprises the speed and the pressure of the fluid, the lattice boltzmann model is an existing model for calculating the flow field information, and the parameters of the fluid at the initial sampling moment are initialization parameters of the fluid at an inlet of the nuclear power assembly.
Further, when the flow field information of the current sampling moment is obtained, the flow field information of the current sampling moment is recorded.
S103: calculating the stress and acceleration of the particles at the last sampling moment according to the speed of the fluid and the parameters of the particles at the last sampling moment;
it is understood that the particulate matter is subject to drag and buoyancy forces in the fluid. When the velocity of the particulate matter is less than the velocity of the surrounding fluid, the drag force is expressed as a driving force of the fluid on the particulate matter, so that the particulate matter is accelerated to the same velocity as the surrounding fluid; when the particle velocity is greater than the ambient fluid velocity, the drag force manifests as a resistance of the fluid to the particles, causing the particles to decelerate to the same velocity as the ambient fluid, and thus the drag force is related to the velocity difference (the difference between the particle velocity and the ambient fluid velocity) and the particle and fluid conditions.
The calculation formula of the drag force is as follows:F drag =β×V p ×(v f - v p ) WhereinF drag In order to be the drag force,βas an empirical parameter related to the flow field,V p is the volume of the particulate matter,v f 、v p the speed of the fluid at the last sampling moment and the speed of the particulate matter are respectively, and the speed of the fluid is the speed of the fluid at the position of the particulate matter.
The calculation formula of the buoyancy is as follows:F buo =V p ×(ρ f - ρ p ) ×gwhereinF buo In order to be a buoyancy force,V p is the volume of the particulate matter,ρ f 、ρ p the density of the fluid and the density of the particulate matter, respectively.
And calculating the acceleration of the particulate matter at the last sampling moment based on the drag force, the buoyancy and the mass of the particulate matter suffered by the particulate matter at the last sampling moment by using Newton's second law.
S104: calculating the speed and the position of the particulate matter at the current sampling moment according to the acceleration, the speed and the position of the particulate matter at the last sampling moment and a geometric model of the nuclear power assembly;
and calculating the estimated speed of the particulate matter at the current sampling moment according to the speed and the acceleration of the particulate matter at the previous sampling moment, and calculating the estimated position of the particulate matter at the current sampling moment according to the position of the particulate matter at the previous sampling moment and the estimated speed of the particulate matter at the current sampling moment. It should be noted that, if the particulate matter collides with the nuclear power component between the previous sampling time and the current sampling time, the speed and the position of the particulate matter at the current sampling time need to be calculated based on the estimated speed and the estimated position of the particulate matter at the current sampling time.
S105: and determining whether the particulate matter is deposited or not based on the speed and the position of the particulate matter at each sampling moment.
Specifically, whether a preset termination condition is reached is judged in the sampling process, the preset termination condition may be that the sampling time reaches the preset time, the number of sampling moments reaches the preset number, and the like, and the preset termination condition may be set according to the actual application needs, which is not specifically limited in this embodiment.
If the preset termination condition is met, terminating sampling, outputting flow field information recorded at each sampling moment and the speed and the position of the particulate matter, drawing the motion track of the particulate matter according to the speed and the position of the particulate matter at each sampling moment, determining whether the particulate matter is deposited according to the motion track of the particulate matter, and determining the deposition position of the particulate matter.
It can be understood that if the position of the particulate matter is on the inner wall of the nuclear power assembly and the positions of the particulate matter at a plurality of consecutive sampling moments are not changed, the particulate matter can be determined to be deposited on the inner wall of the nuclear power assembly.
Therefore, the deposition analysis method for the particles in the nuclear power field disclosed by the embodiment can be used for simulating and calculating the speed and the position of the particles in the fluid in the nuclear power assembly at each sampling moment through the computer aided engineering technology, so that the movement and the deposition process of the particles can be accurately analyzed, nuclear power engineering personnel can be effectively helped to analyze the evolution behavior of the particles in the nuclear power operation process, and the deposition of the particles can be accurately predicted, so that the nuclear power assembly can be timely maintained, and the method has great industrial prediction and application values.
Referring to fig. 3, the present embodiment discloses an optional implementation manner of S104 in the foregoing embodiment, which specifically includes:
s201: calculating the estimated speed of the particulate matter at the current sampling moment according to the speed and the acceleration of the particulate matter at the previous sampling moment;
and calculating the estimated speed of the particulate matters at the current sampling moment according to a calculation formula of the speed and the acceleration.
S202: calculating the estimated position of the particulate matter at the current sampling moment according to the position of the particulate matter at the previous sampling moment and the estimated speed of the particulate matter at the current sampling moment;
and the estimated position of the particulate matter at the current sampling moment is represented by a three-dimensional coordinate.
S203: judging whether the estimated position of the particulate matter at the current sampling moment is in the nuclear power assembly or not according to the geometric model of the nuclear power assembly;
and comparing the position relation between the geometric model of the nuclear power assembly and the estimated position of the particulate matter at the current sampling moment, and judging whether the estimated position of the particulate matter at the current sampling moment is in the nuclear power assembly.
If so, execute S204: respectively determining the estimated speed and the estimated position of the particulate matter at the current sampling moment as the speed and the position of the particulate matter at the current sampling moment, and recording the speed and the position of the particulate matter at the current sampling moment;
if not, go to step S205: determining that the particles collide with the nuclear power component;
s206: determining the specular reflection direction of the speed direction of the particulate matter at the previous sampling moment as the speed direction of the particulate matter at the current sampling moment, and calculating the speed of the particulate matter after collision according to the estimated speed and the recovery coefficient of the particulate matter at the current sampling moment;
s207: determining the speed of the collided particles as the speed of the particles at the current sampling moment, calculating the position of the particles at the current sampling moment according to the speed of the collided particles, and recording the speed and the position of the particles at the current sampling moment.
Taking a nuclear power assembly as an example of a nuclear power pipeline, please refer to fig. 4, where the velocity direction of the particulate matter at the previous sampling time, i.e., the specular reflection direction of the velocity direction of the particulate matter before collision, is the velocity direction of the particulate matter after collision, i.e., the velocity direction of the particulate matter at the current sampling time.
The calculation formula of the speed of the particulate matter after collision is:v p_new =v p_old ×η。
v p_new 、v p_old the values are the post-collision speed and the pre-collision speed, and eta is the coefficient of restitution.
Based on the above-mentioned embodiment, the present embodiment discloses a deposition analysis method for particulate matter in the nuclear power field, and correspondingly discloses a deposition analysis device for particulate matter in the nuclear power field, please refer to fig. 5, which includes:
an initialization unit 501, configured to obtain a geometric model of a nuclear power assembly, and initialize parameters of a fluid at an inlet of the nuclear power assembly and parameters of at least one particulate matter, where the parameters of the fluid at least include a velocity, and the parameters of the particulate matter at least include a velocity and a position;
a flow field information calculating unit 502, configured to calculate flow field information of a current sampling time based on a pre-constructed lattice boltzmann model and a parameter of the fluid at a previous sampling time, where the flow field information includes a velocity of the fluid;
a particle stress calculation unit 503, configured to calculate a stress and an acceleration of the particle at a previous sampling time according to the speed of the fluid and the parameter of the particle at the previous sampling time;
a speed and position calculation unit 504, configured to calculate the speed and position of the particulate matter at the current sampling time according to the acceleration, speed, and position of the particulate matter at the previous sampling time and the geometric model of the nuclear power assembly;
and a deposition analysis unit 505 for determining whether the particulate matter is deposited based on the speed and position of the particulate matter at each sampling time.
In some embodiments, the flow field information calculating unit 502 is specifically configured to input the parameter of the fluid at the last sampling time into a lattice boltzmann model constructed in advance for processing, so as to obtain the flow field information of the current sampling time output by the lattice boltzmann model, where the flow field information includes the speed and the pressure of the fluid, and the parameter of the fluid at the initial sampling time is an initialization parameter of the fluid at the inlet of the nuclear power assembly.
In some embodiments, the particle force calculation unit 503 is specifically configured to:
calculating the drag force borne by the particulate matter at the last sampling moment according to the speed of the fluid, the speed and the volume of the particulate matter at the last sampling moment;
calculating the buoyancy force borne by the particles at the last sampling moment according to the density of the fluid, the density and the volume of the particles;
and calculating the acceleration of the particles at the last sampling moment based on the drag force, the buoyancy and the mass of the particles on the particles at the last sampling moment.
In some embodiments, the speed position calculation unit 504 is specifically configured to:
calculating the estimated speed of the particulate matter at the current sampling moment according to the speed and the acceleration of the particulate matter at the last sampling moment;
calculating the estimated position of the particulate matter at the current sampling moment according to the position of the particulate matter at the last sampling moment and the estimated speed of the particulate matter at the current sampling moment;
judging whether the position of the particulate matter at the current sampling moment is in the nuclear power assembly or not according to the geometric model of the nuclear power assembly;
if the particle is in the nuclear power assembly, respectively determining the estimated speed and the estimated position of the particle at the current sampling moment as the speed and the position of the particle at the current sampling moment, and recording the speed and the position of the particle at the current sampling moment;
if the particles are not in the nuclear power assembly, determining that the particles collide with the nuclear power assembly;
determining the specular reflection direction of the speed direction of the particulate matters at the last sampling moment as the speed direction of the particulate matters at the current sampling moment, and calculating the speed of the particulate matters after collision according to the estimated speed and the recovery coefficient of the particulate matters at the current sampling moment;
and determining the speed of the particles after collision as the speed of the particles at the current sampling moment, calculating the position of the particles at the current sampling moment according to the speed of the particles after collision, and recording the speed and the position of the particles at the current sampling moment.
In some embodiments, the deposition analysis unit 505 is specifically configured to:
judging whether a preset termination condition is reached;
if the preset termination condition is met, terminating sampling, and outputting the flow field information recorded at each sampling moment and the speed and the position of the particulate matter;
drawing the motion trail of the particulate matters according to the speed and the position of the particulate matters at each sampling moment;
and determining whether the particulate matters are deposited or not according to the motion trail of the particulate matters, and determining the positions of the deposited particulate matters.
According to the deposition analysis device for the particles in the nuclear power field, disclosed by the embodiment, the speed and the position of the particles in the fluid in the nuclear power assembly at each sampling moment are simulated and calculated through a computer aided engineering technology, the movement and the deposition process of the particles can be accurately analyzed, nuclear power engineering workers are effectively helped to analyze the evolution behavior of the particles in the nuclear power operation process, and the deposition of the particles is accurately predicted, so that the nuclear power assembly is timely maintained, and the deposition analysis device has great industrial prediction and application values.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage known in the art.
The above embodiments can be combined arbitrarily, and the features described in the embodiments in the present specification can be replaced or combined with each other in the above description of the disclosed embodiments, so that those skilled in the art can implement or use the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for sediment analysis of particles in the nuclear power field is characterized by comprising the following steps:
acquiring a geometric model of a nuclear power assembly, and initializing parameters of a fluid at an inlet of the nuclear power assembly and parameters of at least one particulate matter, wherein the parameters of the fluid at least comprise a speed, and the parameters of the particulate matter at least comprise a speed and a position;
calculating flow field information of the current sampling moment based on a pre-constructed lattice Boltzmann model and parameters of the fluid at the last sampling moment, wherein the flow field information comprises the speed of the fluid;
calculating the stress and acceleration of the particles at the last sampling moment according to the speed of the fluid and the parameters of the particles at the last sampling moment;
calculating the speed and the position of the particulate matter at the current sampling moment according to the acceleration, the speed and the position of the particulate matter at the last sampling moment and a geometric model of the nuclear power assembly;
and determining whether the particles are deposited or not based on the speed and the position of the particles at each sampling moment.
2. The method of claim 1, wherein calculating the flow field information at a current sampling time based on a pre-constructed lattice boltzmann model and parameters of the fluid at a previous sampling time comprises:
inputting the parameters of the fluid at the last sampling moment into a pre-constructed lattice Boltzmann model for processing to obtain the flow field information of the current sampling moment output by the lattice Boltzmann model, wherein the flow field information comprises the speed and the pressure of the fluid, and the parameters of the fluid at the initial sampling moment are initialization parameters of the fluid at the inlet of the nuclear power assembly.
3. The method of claim 1, wherein calculating the force and acceleration of the particulate matter at the previous sampling time based on the velocity of the fluid and the parameter of the particulate matter at the previous sampling time comprises:
calculating the drag force applied to the particulate matter at the last sampling moment according to the speed of the fluid, the speed and the volume of the particulate matter at the last sampling moment;
calculating the buoyancy force borne by the particles at the last sampling moment according to the density of the fluid, the density and the volume of the particles;
and calculating the acceleration of the particulate matter at the last sampling moment based on the drag force and buoyancy of the particulate matter at the last sampling moment and the mass of the particulate matter.
4. The method of claim 1, wherein calculating the velocity and position of the particulate matter at a current sampling time based on the acceleration, velocity, position of the particulate matter at a previous sampling time and a geometric model of the nuclear power assembly comprises:
calculating the estimated speed of the particulate matter at the current sampling moment according to the speed and the acceleration of the particulate matter at the last sampling moment;
calculating the estimated position of the particulate matter at the current sampling moment according to the position of the particulate matter at the last sampling moment and the estimated speed of the particulate matter at the current sampling moment;
judging whether the estimated position of the particulate matter at the current sampling moment is in the nuclear power assembly or not according to the geometric model of the nuclear power assembly;
if the particle is in the nuclear power assembly, respectively determining the estimated speed and the estimated position of the particle at the current sampling moment as the speed and the position of the particle at the current sampling moment, and recording the speed and the position of the particle at the current sampling moment;
if the particles are not in the nuclear power assembly, determining that the particles collide with the nuclear power assembly;
determining the specular reflection direction of the speed direction of the particulate matters at the last sampling moment as the speed direction of the particulate matters at the current sampling moment, and calculating the speed of the particulate matters after collision according to the estimated speed and the recovery coefficient of the particulate matters at the current sampling moment;
and determining the speed of the particles after collision as the speed of the particles at the current sampling moment, calculating the position of the particles at the current sampling moment according to the speed of the particles after collision, and recording the speed and the position of the particles at the current sampling moment.
5. The method of claim 1, wherein the determining whether the particulate matter is deposited based on the velocity and the position of the particulate matter at each sampling time comprises:
judging whether a preset termination condition is reached;
if the preset termination condition is met, terminating sampling, and outputting flow field information recorded at each sampling moment and the speed and the position of the particulate matters;
drawing the motion trail of the particulate matters according to the speed and the positions of the particulate matters at each sampling moment;
and determining whether the particles are deposited or not according to the motion trail of the particles, and determining the position of the particle deposition.
6. The utility model provides a deposit analytical equipment of nuclear power field particulate matter which characterized in that includes:
the device comprises an initialization unit, a calculation unit and a control unit, wherein the initialization unit is used for acquiring a geometric model of a nuclear power assembly and initializing parameters of a fluid at an inlet of the nuclear power assembly and parameters of at least one particulate matter, the parameters of the fluid at least comprise a speed, and the parameters of the particulate matter at least comprise a speed and a position;
the flow field information calculation unit is used for calculating the flow field information of the current sampling moment based on a pre-constructed lattice Boltzmann model and the parameters of the fluid at the last sampling moment, and the flow field information comprises the speed of the fluid;
the particle stress calculation unit is used for calculating the stress and the acceleration of the particles at the last sampling moment according to the speed of the fluid and the parameters of the particles at the last sampling moment;
the speed and position calculation unit is used for calculating the speed and the position of the particulate matter at the current sampling moment according to the acceleration, the speed and the position of the particulate matter at the previous sampling moment and the geometric model of the nuclear power assembly;
and the deposition analysis unit is used for determining whether the particulate matters are deposited or not based on the speed and the position of the particulate matters at each sampling moment.
7. The apparatus according to claim 6, wherein the flow field information calculating unit is specifically configured to input the parameter of the fluid at the last sampling time into a lattice boltzmann model constructed in advance for processing, so as to obtain the flow field information of the current sampling time output by the lattice boltzmann model, the flow field information includes a speed and a pressure of the fluid, and the parameter of the fluid at the initial sampling time is an initialization parameter of the fluid at the inlet of the nuclear power assembly.
8. The device of claim 6, wherein the particulate matter force calculation unit is specifically configured to:
calculating the drag force borne by the particulate matter at the last sampling moment according to the speed of the fluid, the speed and the volume of the particulate matter at the last sampling moment;
calculating the buoyancy force borne by the particles at the last sampling moment according to the density of the fluid, the density and the volume of the particles;
and calculating the acceleration of the particles at the last sampling moment based on the drag force, the buoyancy and the mass of the particles on the particles at the last sampling moment.
9. The apparatus according to claim 6, wherein the velocity location calculation unit is specifically configured to:
calculating the estimated speed of the particulate matter at the current sampling moment according to the speed and the acceleration of the particulate matter at the last sampling moment;
calculating the estimated position of the particulate matter at the current sampling moment according to the position of the particulate matter at the last sampling moment and the estimated speed of the particulate matter at the current sampling moment;
judging whether the position of the particulate matter at the current sampling moment is in the nuclear power assembly or not according to the geometric model of the nuclear power assembly;
if the particle is in the nuclear power assembly, respectively determining the estimated speed and the estimated position of the particle at the current sampling moment as the speed and the position of the particle at the current sampling moment, and recording the speed and the position of the particle at the current sampling moment;
if the particles are not in the nuclear power assembly, determining that the particles collide with the nuclear power assembly;
determining the specular reflection direction of the speed direction of the particulate matters at the last sampling moment as the speed direction of the particulate matters at the current sampling moment, and calculating the speed of the particulate matters after collision according to the estimated speed and the recovery coefficient of the particulate matters at the current sampling moment;
and determining the speed of the particles after collision as the speed of the particles at the current sampling moment, calculating the position of the particles at the current sampling moment according to the speed of the particles after collision, and recording the speed and the position of the particles at the current sampling moment.
10. The device according to claim 6, characterized in that the deposition analysis unit is specifically configured to:
judging whether a preset termination condition is reached;
if the preset termination condition is met, terminating sampling, and outputting the flow field information recorded at each sampling moment and the speed and the position of the particulate matter;
drawing the motion trail of the particulate matters according to the speed and the position of the particulate matters at each sampling moment;
and determining whether the particles are deposited or not according to the motion trail of the particles, and determining the position of the particle deposition.
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