11 results about "Particle cloud" patented technology

The application discloses an ice wind tunnel non-uniform particle diameter multi-particle cloud simulation method, device, equipment and medium, and the method comprises the following steps: S1, grid division is performed on a calculation region in the ice wind tunnel; S2, air flow field calculation is performed by using the grid and convergence is calculated; S3, on the basis of the flow field calculation convergence, a discrete phase model is introduced, combined with a multi-nozzle incident source position, boundary characteristics of the non-uniform particle diameter multi-particle incidence, non-uniform particle diameter cloud multi-particle non-steady state motion heat transfer simulation is completed; S4, cloud particles are updated once when the flow field calculation in the iteration process is set to a step number; and S5, when the number of incident particles and the number of particles leaving the calculation domain reach a dynamic balance, if the evaluation of the particle diameter distribution and the cloud uniformity at the outlet section does not meet the requirements, the nozzle incident source position and the cloud particle boundary setting are redesigned, and the coupling iteration calculation of the cloud non-steady state is performed. The application can obtain more accurate distribution results of the cloud at each section position.

The invention relates to the field of aquatic ecosystem restoration, and discloses an aquatic ecosystem rapid restoration construction method which comprises the following steps: stripping a bottom mud surface layer by utilizing a controlled hydraulic vortex field to form suspended particle cloud; double closed-loop intelligent control is started during construction, the physical state of operation is adaptively adjusted based on real-time feedback of process acoustic signals, meanwhile, the biological potential and the environmental risk of the suspended particle cloud are diagnosed online, and according to the decision, a corresponding repairing preparation is injected; according to the invention, by constructing an intelligent operation system with unified physical execution and biochemical decision, the restoration mode conversion from traditional exogenous coverage to endogenous potential awakening is realized, and real-time diagnosis and adaptive regulation and control can be carried out on each operation point location in a complex and uncertain underwater environment, so that blind construction is avoided, and the construction efficiency is improved. And the effectiveness of ecological restoration is improved.

Various aspects of methods, systems, and use cases include techniques for robotic relocalization. A robot may be configured to perform relocalization using operations to determine a cause of a loss of pose; use a nearest neighbor process to select a set of milestones from a roadmap when the cause of the loss of pose is due to a malfunction, or use a ranking process to select the set of milestones from the roadmap when the cause of the loss of pose is not due to the malfunction, the roadmap including a plurality of milestones; generate particle clouds around each milestone in the set of milestones; and perform localization on each milestone in the set of milestones to attempt to relocalize the robot.

This invention provides an experimental method for simulating the diffusion process of aluminum powder in the explosion field of aluminum-containing explosives. The method involves mixing aluminum powder particles with inert material particles that have similar parameters such as density and impact impedance, and similar kinetic properties. These mixed particles replace the original aluminum powder particles in the aluminum-containing explosive sample, creating an aluminum-containing explosive sample. This sample weakens the intense combustion light of the aluminum powder particles during the explosion, facilitating the capture of particle cloud dispersion and diffusion images by high-speed cameras positioned axially and radially on the sample. The dynamic distribution space of the aluminum powder can be reconstructed from the obtained radial and axial images, determining its spatial volume change over time. This provides crucial data for the dynamic changes in aluminum powder concentration, solving the technical problem of lacking effective measurement methods for the spatiotemporal distribution and concentration evolution of aluminum powder particles in the explosion field of aluminum-containing explosive samples. This provides important technical support for the optimized design of aluminum-containing explosive sample formulations and charge structures.

The invention discloses an icing wind tunnel non-uniform particle size multi-particle cloud simulation method, device and equipment and a medium. The method comprises the following steps: S1, carrying out grid division on a calculation region in an icing wind tunnel; s2, performing air flow field calculation by using the grid and calculating convergence; s3, a discrete phase model is introduced on the basis of flow field calculation convergence, and non-uniform particle size cloud and mist multi-particle unsteady state motion heat transfer simulation is completed in combination with the position of a multi-nozzle incident source and the boundary characteristics of non-uniform particle size multi-particle incidence; s4, updating cloud and mist particles once when a set step number is calculated in an iteration process flow field; and S5, when the number of incident particles and the number of particles leaving the computational domain reach dynamic balance, if the particle size distribution and the cloud uniformity of the section particles at the outlet are evaluated not to meet the requirements, redesigning the position of the incident source of the nozzle and the cloud particle boundary setting, and carrying out unsteady-state coupling iterative calculation of the cloud. According to the invention, a more accurate distribution result of the cloud and mist at each section position can be obtained.

The invention provides a test method for simulating an aluminum powder diffusion process in an aluminum-containing explosive explosion field, which comprises the following steps of: mixing inert material particles with aluminum powder particles to obtain mixed particles, and replacing original aluminum powder particles in an aluminum-containing explosive sample with the mixed particles, the sample can weaken the burning strong light of aluminum powder particles in the explosion process, so that high-speed cameras arranged in the axial direction and the radial direction of the aluminum-containing explosive sample can conveniently capture scattering and diffusion images of particle clouds in an explosion field; the dynamic distribution space of the aluminum powder can be reconstructed according to the obtained radial image and axial image, the change process of the space volume along with time is determined, key data is provided for the dynamic change of the concentration of the aluminum powder, and the technical problem that the spatial and temporal distribution and concentration evolution process of aluminum powder particles in an aluminum-containing explosive sample explosion field are lack of effective measurement means is solved. And important technical support is provided for optimal design of an aluminum-containing explosive sample formula and a charging structure.

The application provides a laser velocity measuring device for particle groups, comprising a fiber installation frame, a multi-laser emitting device, a multi-laser receiving device and a particle emitting device; a plurality of groups of parallel distributed light curtain installation frames are arranged on the fiber installation frame, and optical fibers are installed on the light curtain installation frames; the optical fibers comprise input optical fibers and output optical fibers; one end of the input optical fibers is connected with the multi-laser emitting device, and the other end is installed on one side of the light curtain installation frame; one end of the output optical fibers is connected with the multi-laser receiving device, and the other end is installed on the other side of the light curtain installation frame; the particle emitting device is arranged on one side of the fiber installation frame, and the particle group emitting direction is perpendicular to the light curtain; and the application further provides a laser velocity measuring method for particle groups. The application realizes the measurement of the particle cloud movement velocity vector and trajectory, can conveniently and flexibly adjust the distance between laser beams to measure the trajectories of the maximum number of particles, and has the advantages of simple operation, low cost and strong practicability.

The invention relates to the technical field of process parameter measurement, and discloses a gas-solid two-phase flow measurement method and system based on an array electrostatic sensor, and the method comprises the steps: applying a group of multiphase periodic potentials to an upstream space-time coding modulator, forming a space-time coding excitation field in a pipeline, and carrying out the electrical characteristic modulation of a flowing particle cloud cluster; acquiring a response signal through a downstream synchronous sensing array, and synchronously demodulating the response signal to obtain an in-phase component representing in-phase response and an orthogonal component representing orthogonal response; and calculating to obtain a flow parameter based on the in-phase component and the orthogonal component. The reference signal strictly synchronized with the excitation signal is adopted to perform phase-locked amplification processing on the response signal, so that a weak response component caused by modulation can be extracted from background noise far stronger than the target signal with high selectivity, and the signal-to-noise ratio and the detection sensitivity of the system are greatly improved.

The invention discloses an iron powder particle cloud combustion numerical calculation method for simulating and considering differential diffusion, and belongs to the field of iron powder combustion numerical simulation calculation. According to the method, numerical simulation can be carried out on 2D flames of iron powder particle cloud free propagation considering differential diffusion under the microgravity condition, and for the difference of thermal diffusivity between gas phase components, the effect of surface reaction kinetics and the effect of a diffusion control mechanism are considered at the same time in an autonomously established iron powder particle combustion model; the local Lewis number is calculated in real time, a diffusion term is corrected in a gas phase component equation, and the influence of differential diffusion on the flame temperature and flame propagation speed of iron powder particle cloud and the influence on the heat release rate of single particle combustion and the mass fraction of oxygen on the particle surface are quantitatively analyzed. The influence of oxygen concentration and thermal expansion on combustion of the iron powder particle cloud is further considered. The method has guiding significance for developing a lean fuel iron flame model with a low flame propagation speed and other metal particle combustion models.

The application discloses a numerical calculation method for simulating iron powder particle cloud combustion considering differential diffusion, and belongs to the field of iron powder combustion numerical simulation calculation. The application can numerically simulate 2D free propagation of a flame of an iron powder particle cloud under microgravity conditions considering differential diffusion. For the difference of thermal diffusion rates among gas phase components, the application considers the effects of surface reaction kinetics and diffusion control mechanism in the self-established iron powder particle combustion model, calculates a local Lewis number in real time, corrects a diffusion term in a gas phase component equation, quantitatively analyzes the effects of differential diffusion on the flame temperature and flame propagation speed of the iron powder particle cloud, and the effects of differential diffusion on the heat release rate of single particle combustion and the oxygen mass fraction of a particle surface, and further considers the effects of oxygen concentration and thermal expansion on the iron powder particle cloud combustion. The application has guiding significance for developing a lean fuel iron flame model with low flame propagation speed and other metal particle combustion models.

The invention relates to the technical field of civil engineering, and discloses a pretreatment stirring device for flow-state solidified soil, the pretreatment stirring device comprises a stirring tank used for containing flow-state soil and a control unit, a stirring unit is arranged in the stirring tank and used for driving the flow-state soil to form a macroscopic vortex field, a curing agent injection unit and a degassing unit are further arranged in the stirring tank, and the control unit is connected with the control unit. Wherein the curing agent injection unit is used for pre-dispersing curing agent powder into particle cloud and injecting the particle cloud below the liquid level of fluid soil in the stirring tank, and the degassing unit is used for inducing bubbles in the fluid soil to converge towards the central area of the macroscopic vortex field. Through the ultrasonic atomization injection part, curing agent powder is forcibly atomized into highly dispersed particle cloud by utilizing high-frequency sound wave energy before being in contact with the liquid level. The physical condition that the surface of the curing agent is hydrated instantly when meeting water to form a hard shell to wrap internal dry powder is fundamentally eliminated, and a decisive foundation is laid for subsequent uniform mixing.