1253 results about "Convective flow" patented technology

The invention discloses a water pollution event situation analysis inversion method, and relates to the field of remote sensing technology and environment model technology, the method comprises the following steps: carrying out feature fusion on an obtained infrared image and an ultraviolet fluorescence image, building an oil film thickness calculation model based on the fused comprehensive features, and obtaining the observation concentration of a detection area by using the model; establishing a convective diffusion model of the target water area, introducing a loss item related to time and flow velocity, estimating the predicted concentration of the detection area by using the convective diffusion model, establishing an inversion model based on the observed concentration and the predicted concentration, and speculating the leakage position and leakage time in the target water area through an optimization iteration mode; according to the technical scheme, the infrared image and the ultraviolet fluorescence image are subjected to feature fusion, the oil concentration of the detection area can be accurately calculated, the loss item related to the time and the flow velocity is introduced into the convection diffusion model, and the inversion precision of the leakage position and the leakage time is improved.

The invention discloses a water environment monitoring system and method based on big data analysis, and the system comprises a data collection and processing module which is responsible for collecting and processing original data related to a water environment, and transmits the processed data to a water flow and pollutant diffusion modeling module; and the water flow and pollutant diffusion modeling module is responsible for constructing a hydrodynamic model by utilizing a CFD simulation method based on the processed data, and predicting a pollutant diffusion trend through a convection-diffusion equation. According to the invention, the data analysis and prediction module deeply excavates potential information in acquired data and simulation results through a K-means clustering algorithm and an LSTM algorithm, and realizes accurate prediction of pollutant diffusion and water quality change time series. And the early warning and emergency response module can discover potential water quality pollution events in advance based on the prediction results and the real-time monitoring data, and give out early warning in time, so that the quick response capability of coping with the water quality pollution events is enhanced.

The invention provides a permafrost region ventilation pipe foundation design method based on a heat balance principle, and aims to keep heat balance of permafrost on the lower portion of a foundation and ensure long-term heat stability of the foundation. According to the method, meteorological data, soil physical parameters and permafrost upper limit and ground temperature distribution information are collected so as to evaluate whether additional protection measures are needed or not and determine the burying height of the ventilation pipe foundation. And based on the selected ventilation pipe configuration, the air speed in the pipe is calculated by using a corresponding air speed calculation formula, and the convective heat transfer coefficient is determined accordingly. And determining the diameter of the pipeline by combining the convective heat transfer coefficient and the economical efficiency. And the cooling radius and the optimal operation mode of the ventilation pipe foundation are further determined, so that heat balance at the bottom of the foundation is ensured, and permafrost at the lower part of the foundation is effectively protected. The design method is simple, convenient, rapid and accurate, and has important engineering application value and wide applicability.

The invention discloses a method for simulating migration of pollutants in a bioretention pond based on COMSOL Multiphysics, and the method comprises the following steps: determining design parameters of the bioretention pond by integrating rainfall runoff pollution data of an actual engineering construction area and carrying out related calculation, determining the pollutants, and carrying out the simulation of the migration of the pollutants in the bioretention pond. Pollutant accumulation characteristics and adsorption and desorption characteristics of pollutants in a filler are obtained through a pollutant accumulation experiment, a pollutant adsorption leaching experiment and the like, a bioretention pond pollutant migration model comprises a fluid flow equation and a solute migration equation, and links such as convection diffusion, adsorption and desorption, dissolution and reaction degradation are considered in solute migration. The efficient simulation on the pollutant transportation of the bioretention pond is realized. According to the method, the influence of different filler combinations and design scales on the pollutant removal efficiency of the bioretention pond is explored, the parameter conditions of water outlet target optimization control are determined, and scientific support is provided for the optimization design of the bioretention pond.

The utility model provides a gas inlet device which is used for transmitting reaction gas into a reaction chamber and comprises a guide plate and a gas uniformizing chamber, the guide plate is arranged at the top in the gas uniformizing chamber and comprises a center area and an edge area, the edge area is provided with a first through hole for the reaction gas to pass through, and after the reaction gas passes through the guide plate, the first through hole is communicated with the gas uniformizing chamber. And the gas flows into the reaction chamber through the gas uniformizing chamber. According to the gas inlet device, when reaction gas enters the gas inlet device, mutual pollution between pipelines and cyclones generated by gas convection can be reduced, so that the reaction gas is mixed more sufficiently, gas flowing is more stable, the flow of center gas can be reduced, the gas flowing is more uniform, and the uniformity of the gas reaching the surface of a wafer is improved.

The invention relates to the technical field of annealing furnaces, in particular to a swirl injection type energy-saving annealing furnace. The device comprises outer shell plates and an air duct, the outer shell plates are spliced to form a hearth, the air duct is arranged in the outer shell plates to form an air path for convective circulation, the air duct is connected with a circulating fan, and air in the air duct and an inner cavity of the hearth is driven by the circulating fan to actively convectively circulate. The air direction of air convection circulation of the air channel faces the side face and the lower portion of the workpiece needing annealing, and a heat preservation layer is attached to the inner surface of the outer shell plate. The shell plate is used for supporting a main body structure of the furnace body, the air duct is used for achieving circulation convection of air flow, the annealing efficiency and the annealing quality of the metal coiled materials are improved through circulation convection of high-temperature air flow, the heat preservation layer is used for storing internal heat, reducing energy leakage and effectively reducing loss, and the circulation fan is used for providing power for circulation convection of the air flow.

The present invention discloses a storage box with adjustable air vents, the number or size of the first air vents exposed can be adjusted by rotating the rotary adjustment valve, and the number or size of the second air vents exposed can be adjusted by shifting the sliding adjustment valve, so that the ventilation volume of the air vents at two sides can be changed or even the air vents can be completely closed, and the freshness of bread can be further improved by controlling the convection of air flow to affect the change of air humidity. The rotary adjustment valve and the sliding adjustment valve both have a very simple structure, fewer parts and low cost, and are very convenient to mount, maintain and use.

The invention provides a water pollution traceability and prediction method based on a hydrodynamic force-water quality coupling model, and the method comprises the steps: generating a model file based on hydrological data and actually measured hydrological data of Jiaodong water transfer project-Huang-Jiaoqing line sections, and importing the model file into a hydrodynamic force model, according to the difference degree of a water level simulation value output by the hydrodynamic model and a water level measured value, calibration roughness and a leakage coefficient, establishing a hydrodynamic model matched with the Yellow-Jichi-Qi line section; the boundary file is updated based on the water quality boundary condition, the AD parameter file and the initial concentration value of the water quality parameter are imported into a convection diffusion model, the longitudinal diffusion coefficient and the attenuation coefficient are calibrated according to the difference degree between the water quality parameter concentration simulation value output by the convection diffusion model and the concentration measured value, and the convection diffusion model matched with the Huangxi Jicqing line section is established; and tracing and predicting water pollution by adopting an adaptive hydrodynamic model and a convective diffusion model. According to the invention, the accuracy and efficiency of water pollution tracing and prediction can be improved.

A worm and worm gear pair heat-fluid-solid coupling analysis method comprises the following steps that 1, a heat-fluid-solid coupling simulation analysis model of a worm and worm gear pair is built, and a three-dimensional geometric model is built based on the worm and worm gear meshing principle; 2, parameterized grid division is carried out on the simulation analysis model, a tetrahedral unstructured grid is adopted for a fluid domain, and a worm and worm gear tooth surface area is densified; 3, based on the fluid dynamics theory and an RNG # imgabs0 # turbulence model, establishing an oil-immersed lubricating oil gas two-phase flow transient simulation model, and solving fluid dynamic pressure and a convective heat transfer coefficient through a pressure-speed coupling algorithm; 4, establishing a three-dimensional transient dynamic simulation model based on a solid mechanics theory, combining a temperature-stress coupling field equation, adopting an explicit dynamic algorithm, and iteratively solving thermal deformation and stress strain of the worm and the worm gear through a finite element method; and 5, bidirectionally transmitting the pressure of the fluid domain, the convective heat transfer coefficient and the thermal deformation data of the solid domain through the fluid-solid interface, and carrying out iterative solution until convergence.

The invention discloses a high-heat-dissipation dry-type transformer. The high-heat-dissipation dry-type transformer comprises a transformer body and a supporting bottom block, wherein the supporting bottom block is used for supporting and installing the transformer body; the air guide assembly is detachably installed above the supporting bottom block and used for feeding air into the transformer body so as to accelerate air flowing; the diffusion assembly is arranged on the transformer body and used for diffusing and changing the area and direction of air supplied by the air guide assembly, and the air guide assembly can guide the air output by the air blower into the transformer body to form forced convective circulation; air entering the transformer body diffuses the coverage area range of the air through the diffusion assembly, the heat dissipation capacity of the winding and the iron core is further improved, meanwhile, the vertically-entering air is adjusted to be in a spiral rising state, the standing time of the air flow in the transformer body is prolonged through the centrifugal effect, and the heat dissipation efficiency is improved. Meanwhile, the contact area range with the winding and the iron core is increased, and the heat exchange efficiency is enhanced.

The invention belongs to the technical field of airplane and engine electric heating deicing, and discloses an airplane electric heating deicing unsteady state process prediction method and device and a medium, and the method comprises the steps: firstly calculating an air flow field and a water drop field, obtaining an external convective heat transfer coefficient and a water drop impact amount result, and providing external data for deicing unsteady state simulation calculation; during unsteady state simulation calculation, through coupling iteration of the exchange boundary, the icing / ice melting rate and temperature distribution are obtained, and the icing amount and the overflow state are updated according to the icing / ice melting rate and the temperature distribution. In the coupling iteration of the exchange boundary, an overflow phase change calculation process and a flow guide calculation process are included, and the overflow phase change calculation result and the flow guide calculation result serve as boundary conditions for executing flow guide and overflow phase change correspondingly. And a theoretical basis is provided for deicing effect analysis and electric heating deicing strategy design.

The gradually-expanded printed circuit board type heat exchange inner core comprises a cover plate, a bottom plate, a cold side plate layer and a hot side plate layer, a cold side gradually-expanded channel is of a flow channel structure with the width gradually expanded, and the sectional area of a flow channel dynamically adapts to gas-liquid phase change and volume change. And pressure drop fluctuation and bubble aggregation caused by gas phase expansion are reduced, the shunt channels and the divergent channels are arranged in parallel, an inner wall porous structure is combined, medium distribution uniformity is optimized through graded distribution and surface wettability enhancement, and the flow stability is remarkably improved. The turbulent flow ribs are arranged in the heat exchange channel on the heat side, combination of heterogeneous working media such as supercritical CO2-water and liquid hydrogen-liquid oxygen is supported by destroying a heat boundary layer, inducing turbulent flow and strengthening convective heat exchange and phase change heat transfer, the heat exchanger can improve the heat exchange efficiency while reducing pressure drop, compactness, reliability and wide working condition adaptability are considered, and the heat exchange efficiency is improved. Two-phase flow optimization and efficient heat exchange are achieved, and the extreme heat exchange requirements in the fields of aerospace, new energy and the like are met.

The invention discloses a CO2-oil near-miscible phase pressure acquisition system and method based on convective mixing, and belongs to the field of CO2 oil displacement. The system comprises a high-temperature and high-pressure reaction kettle, a temperature and pressure control system, a gas injection module, a liquid injection module and a monitoring control module. According to the method, the oil phase and the carbon dioxide are induced to form a convective mixing effect by dynamically regulating and controlling the injection flow rate, and when no interface of the system reaches a mutual convective mass transfer state, the system pressure corresponding to a phase interface disappearance critical point is directly recorded as a near-miscible-phase pressure value. The near-miscible pressure value obtained by the method is high in accuracy, the single test time is shortened to 1 hour, the test period is remarkably shortened, near-miscible pressure parameters under different temperature conditions can be measured in a short time, the CO2-oil near-miscible pressure can be measured by simulating a high-temperature and high-pressure environment of a stratum, and the method is suitable for popularization and application. And high-timeliness key phase state data support is provided for unconventional oil and gas reservoir development.

The invention relates to the technical field of coal mills, and discloses a high-uniformity low-energy-consumption static nozzle ring device which comprises a nozzle ring, a wear-resistant block and a pressing and blocking piece. The nozzle ring is fixed in the machine shell, the nozzle ring and a millstone supporting ring in the machine shell are coaxially arranged, a through-flow area of the nozzle ring is provided with a first airflow channel, a second airflow channel and a third airflow channel which are sequentially communicated from bottom to top, and a plurality of first blades are arranged in the second airflow channel to divide the second airflow channel into a plurality of first nozzles. The through-flow area of the first nozzle is gradually increased from the position close to the primary air outlet to the position far away from the primary air outlet; and the wear-resistant block is limited in the third airflow channel of the nozzle ring through the pressing and blocking piece. The airflow velocity distribution of a through-flow area is simulated through an experiment, and the through-flow area of a runner is adjusted by using a spline curve, so that the flow velocity of a flow field in a whole nozzle ring area is more uniform, the abrasion condition of an abrasion-resistant block and a machine shell is effectively improved, and the overall service life is prolonged.

The invention relates to the technical field of tooth crest gap leakage, discloses a gear pump, and aims to solve the problem that the performance, the operation efficiency and the operation stability of the gear pump are reduced due to leakage jet flow caused by a relatively large tooth crest gap in the gear pump. A driving gear and a driven gear of the gear pump are mounted in a pump body, are in meshed connection and are used for driving fluid to flow in the pump body. And at least one of the driving gear and the driven gear is provided with a jet flow channel at the gear teeth. The jet flow channel is provided with a flow inlet and a jet flow opening which communicate with each other, and when the gear teeth rotate towards the high-pressure side, the flow inlet is formed in the high-pressure side of the gear teeth and used for enabling part of fluid to enter the jet flow channel from the flow inlet and be sprayed out from the jet flow opening so as to increase the drainage resistance of the tooth top gap. The spontaneous jet flow jetted through the jet flow channel and the leakage jet flow of the tooth crest gap form convection flow, so that the flowing speed of the leakage jet flow is reduced, the leakage flow resistance is increased, and the performance, the operation efficiency and the operation stability of the gear pump are improved.

To provide a dispenser that dispenses abundant kinds of water such as water having different chemical characteristics such as alkali water or water having different carbonation levels at different temperatures.SOLUTION: A beverage station includes a spigot that fluid communicates with an ambient temperature water passage and where chilled water and alkali water are mixed to provide chilled alkali water. A hot water heating element is located below the spigot so that hot water flows upward for dispensing from the spigot, and a vent passage between the heating element and the spigot helps the hot water to flow from the spigot to the heating element. A refrigeration system and a carbonation system are also provided. The refrigeration system uses the ice-bank technology. An underwater agitator pump improves heat exchanged between an ice-bank and water by forced convection. The agitator pump operates based on a temperature of beverage water. A figure eight-shaped evaporator coil can provide two cylindrical ice banks and two drinking water coils to increase a water chilling capacity.SELECTED DRAWING: Figure 2A

The present invention discloses a method and device for numerical simulation of near-wall single cavitation collapse coupled with boundary motion, comprising: step 1, introducing a physical model of a near-wall single cavitation into a pre-constructed external flow field to obtain a corresponding flow field physical model; step 2, meshing the flow field physical model; setting initial conditions and flow field boundary conditions, and setting a time step that meets the calculation requirements; step 3, setting specific calculation parameters for solving the flow field process, and introducing a fluid volume method to capture the gas-liquid interface; step 4, applying wall vibration in the form of a user-defined function to simulate the cavitation dynamics behavior under vibration impact. The present invention takes into account the influence of wall vibration in the numerical simulation process by coupling boundary motion, and realizes the simulation of the dynamics behavior of near-wall single cavitation under vibration impact conditions. On this basis, the influence of conditions such as vibration frequency on the cavitation collapse process can be further explored, providing theoretical guidance for optimized cavitation suppression design.

The invention belongs to the field of heat exchangers, and discloses a Stirling engine heat exchanger for a molten salt reactor and a Stirling engine, the Stirling engine heat exchanger for the molten salt reactor comprises a heat exchanger shell, a liquid inlet is formed in the top of the heat exchanger shell, and a liquid outlet is formed in the side wall of the bottom of the heat exchanger shell; the working medium cylinder is hermetically connected with the heat exchanger shell; the multiple first baffle plates are arranged in the heat exchanger shell at intervals in the height direction of the heat exchanger shell, and first channels are formed between the outer side walls of the first baffle plates and the inner side wall of the heat exchanger shell; a second baffle plate is arranged between every two adjacent first baffle plates, and a second channel is formed in the center of each second baffle plate; a plurality of U-shaped heat exchange pipes are arranged in the heat exchanger shell in an array mode along the circumference and penetrate through the first baffle plate and the second baffle plate, and the two ends of each U-shaped heat exchange pipe are inserted into the working medium barrel correspondingly. By arranging the baffle plates, the flowing direction of fused salt and a working medium is changed from parallel flowing to staggered flowing, the convective heat transfer coefficient of the fused salt side is increased, and the heat exchange efficiency is improved.

The utility model provides a water draining structure of a humidifier, the top of the water draining structure is provided with a flow channel for allowing water flow to pass through and a water inlet communicated with the flow channel, the flow channel comprises an annular bottom wall and a side wall surrounding the periphery of the bottom wall, and the bottom wall is provided with a plurality of water outlets arranged at intervals; the side wall is provided with a plurality of flow guide plates protruding in the flow channel, one flow guide plate at least corresponds to one water outlet, the water outlets are arranged close to the sides, back to the water inlet, of the flow guide plates, and the included angle formed by the flow guide plates and the side wall close to the water outlets is an acute angle. Water flow in the flow channel is divided and guided through the flow guide plate, so that one part of the water flow can flow into the passing water outlet, and the other part of the water flow continues to flow backwards along the flow channel, the situation that the water flow excessively flows out of the water outlet close to the water inlet during free flowing is avoided, and the water flow at the water outlet at the far end is guaranteed; and therefore, the water drainage uniformity of the water outlets at different positions is improved, and the uniformity of the wetting wet curtain is also improved.

A seat can provide improved ventilation to a seat occupant. The seat can have a seat body including a core and an outer cover defining an outer surface of the seat. A flow passage can be defined in the seat body. The flow passage can include an opening defined in the outer cover. The portion of the seat body including the opening can be caused to move away from a seat occupant. Thus, convective cooling can be provided to the seat occupant in a region corresponding to the portion.

The multi-field coupling collaborative modeling and parameter autonomous intelligent decision-making method for the roller type quenching process comprises the steps that four key process parameters including the nozzle flow, the water ratio, the roller gap distance and the plate passing speed are collected and subjected to normalization preprocessing, and a training set and a test set are divided; the four key process parameters of the training set serve as input, the water-cooling convective heat transfer coefficient and the phase change plasticity coefficient serve as output, a BP neural network is trained, and the workpiece surface water-cooling convective heat transfer coefficient and the material internal phase change plasticity coefficient are predicted through the trained BP neural network; a multi-field coupling model composed of a temperature field, a structure phase change field and a stress-strain field is solved, and quantitative calculation of quenching core quality indexes is achieved; by taking water consumption minimization as a target, constructing a nonlinear optimization model under the condition that multiple core quality index constraints of the plate temperature, the outlet hardness and the plate shape are met; and performing global optimization on the optimization model by adopting a differential evolution algorithm, and autonomously deciding an optimal process parameter set value.

The invention discloses a furnace end of an electric flame stove. The furnace end comprises a shell, an air inlet assembly and a plurality of plasma combustion assemblies. A plurality of heat dissipation air channels are formed in the plasma combustion assembly, the air inlet holes and the air outlet holes are located in the two ends of the heat dissipation air channels correspondingly, convective airflow is formed, heat dissipation is effectively conducted on the heat dissipation fins on the anode needle, and heat is prevented from being transmitted to a circuit board through a conductor; according to the plasma combustion assembly, threaded connection or welding is not needed, all accessories of the plasma combustion assembly are clamped and pressed through the top and the bottom of the shell, the installation process is simpler, more convenient and more direct, operation is easy and convenient when the plasma combustion assembly is maintained or replaced in the later period, and the maintenance cost and time are reduced; the upper positioning groove in the top of the upper ceramic tube and the lower positioning groove in the bottom of the lower ceramic tube are connected with the upper end and the lower end of the heat dissipation fin in an embedded mode respectively, and it can be guaranteed that the heat dissipation fin is accurately placed at the preset position in the installation process.

The invention relates to the technical field of chemical reaction equipment, in particular to a pulse intermittent water vapor bottom blowing coupling mechanical stirring enhanced mixing device which comprises a tank body, a sealing cover is mounted on the top surface of the tank body, a stirring assembly used for stirring the interior of the tank body is mounted on the sealing cover, the stirring assembly extends into the tank body, and the stirring assembly is connected with the tank body. An air outlet head is arranged at the bottom in the tank body, the air outlet head is communicated with a steam generation unit through an air supply pipe, and the steam generation unit is electrically connected with a pulse control unit used for sending variable frequency signals with adjustable pulse frequency to the steam generation unit. The steam injection frequency is controlled through the pulse control unit, the use amount of the steam is reduced, local high temperature generated by the system during continuous injection is avoided, the temperature is more uniform, meanwhile, convection can be further strengthened through nonlinear input, the periodic structure of the system is damaged, and the service life of the system is prolonged. And more chaotic flow regions are formed to enhance mixing and heat transfer efficiency, so that the production efficiency is improved, and the energy loss is reduced.

The invention discloses a nowcasting method for convective storm strong wind. According to the method, the radar data is subjected to electromagnetic interference echo removal and deblurring processing, data points influencing a prediction result are eliminated, the reliability of the radar data is enhanced, and the accuracy of a strong storm area is improved; performing initial region identification by using a region growing algorithm, extracting severe convection structure information in the radar image, and removing a weak region which is too small in area and may be a misidentification result; the vertical direction in the strong storm area is predicted by combining an L-K optical flow method and a Bhatpacarya coeffcient method, the overall dynamic analysis is performed on the radar echo area, and the potential strong wind activity is finely identified and effectively predicted; and weighted voting is carried out on prediction results corresponding to the SVM, the CNN and the U-Net, so that the prediction dimension is widened, the recognition performance is enhanced, the robustness of the integrated model is improved, and the accuracy of storm prediction in the horizontal direction in the strong storm region is improved.

The invention discloses a multistage dynamic complex excitation solid waste roadbed filler treatment device and method, and relates to the technical field of solid waste resource utilization. The device comprises a pretreatment unit, a metering unit, a mixing unit and a control unit. The pretreatment unit is used for treating carbide slag, silica fume, excavated spoil and EPS particles, so that the problems that aggregates are not refined, oversized particles are not thoroughly removed, the EPS particles are not graded and the like are solved; in the material mixing unit, a first stirring shaft and a second stirring shaft are vertically distributed to form a three-dimensional shear flow field, and a material lifting device forms vertical convective circulation, so that the problem of non-uniform mixing caused by easy floating of EPS particles due to low density can be effectively solved; and the control unit realizes cooperative control of each unit. According to the device and the method, the mixing uniformity of the solid waste roadbed filler can be improved, the strength fluctuation is reduced, the quality requirement of engineering on the roadbed filler is met, and solid waste resource utilization is promoted.

The invention relates to the technical field of water quality monitoring and analysis, in particular to an underground water quality factor dynamic migration analysis method and system. The method comprises the following steps: acquiring historical monitoring data of underground water, including acquiring water quality factor concentration, water level, water temperature, permeability and porosity; obtaining the concentration of the fed electrolyte, and calculating the underground water flow velocity according to the electrolyte diffusion velocity; constructing a groundwater quality factor migration model based on a convection-dispersion equation according to the groundwater flow velocity, and introducing a neural network and a generative adversarial network to carry out model parameter optimization on the groundwater quality factor migration model; the optimized groundwater quality factor migration model is subjected to model solution, the calibrated groundwater quality factor migration model is used for water quality factor migration trajectory analysis, the water quality factor concentration value of each grid point at different moments can be obtained in real time, and analysis of groundwater quality factor dynamic migration is achieved.

The invention discloses an efficient and high-precision numerical simulation method for an air cooling field of a diesel engine. The method comprises the following steps: (1) based on a porous medium model theory, using a defined porous medium model to replace an internal structure of an original radiator to establish a three-dimensional radiator simplified model containing a porous medium area; (2) according to the dimensionless similarity of speed distribution of a fan rotational flow main body section, the dissipation rate generation and diffusion term coefficient of a turbulent energy dissipation equation in a standard k-epsilon turbulence model are adjusted, (3) the standard k-epsilon turbulence model is adopted for a forced convection dominant area, the k-epsilon turbulence model corrected by the turbulent flow viscosity coefficient is adopted for a natural convection dominant area, and the turbulent flow viscosity coefficient of the natural convection dominant area is corrected. In order to guarantee smooth and stable transition of turbulence viscosity, a k-epsilon turbulence model corrected by turbulence viscosity coefficient linear interpolation is adopted for a transition area of forced convection and natural convection; and (4) a diesel engine air cooling field numerical simulation technology based on partition processing is adopted. According to the method, high-precision numerical simulation on the basis of a small number of grids is realized.

The invention provides a switch cabinet structure optimization method, system and device based on temperature field distribution and a medium, and belongs to the technical field of power switch cabinet optimizing.The method comprises the following steps that a geometric model of a switch cabinet is determined, and a finite volume method is used for establishing a heat-flow coupling thermal analysis model of the switch cabinet; analyzing a heat transfer process of the switch cabinet, setting boundary conditions through a convection effect and a radiation effect, and operating a heat-flow coupling thermal analysis model of the switch cabinet to obtain distribution characteristics of a temperature field and a velocity field in the switch cabinet; determining influence factors of the switch cabinet, designing an orthogonal test, and analyzing the influence degree of the change of each influence factor on the average temperature rise of the internal surface of the switch cabinet; and selecting the key factors of which the influence degrees are greater than a threshold value, and performing optimization by using a switch cabinet optimization model of a BP neural network combined genetic algorithm to obtain an optimal switch cabinet structure design scheme. The design accuracy and efficiency of the switch cabinet are improved, the design cost is reduced, and meanwhile the stability and safety of the switch cabinet are improved.

The utility model provides a reaction tank for heat transfer fluid production. The reaction tank comprises a reaction kettle main body, an omnidirectional flow mixing assembly and a convection ring seat, a linear actuator is arranged on the top surface of the reaction kettle main body and drives the omni-directional flow mixing assembly to do lifting motion in the reaction kettle main body. The omni-directional flow mixing assembly comprises a circulating guide cylinder, a driving machine cylinder and a centrifugal impeller, the flow speed of liquid in the circulating guide cylinder is increased through high-speed rotation of the centrifugal impeller, and high-speed conveying and flow mixing stirring of the liquid are achieved. The convection ring seat is positioned at the bottom end of the omnidirectional flow mixing assembly, and liquid convection spraying is performed through a plurality of spraying holes, so that the liquid is fully mixed in the reaction kettle main body, and the stirring uniformity of the liquid is ensured. The liquid mixing device can realize liquid layered mixing in the vertical direction, avoids local uneven mixing, improves the mixing efficiency of heat conduction liquid, and is suitable for efficient stirring of various complex liquids.

The invention provides a heat dissipation structure and a design method thereof, the heat dissipation structure comprises a substrate, a first flow channel and a second flow channel, the first flow channel and the second flow channel are embedded in the substrate, are mutually stacked and are mutually staggered in the extension direction, and the structure parameters of a micro-flow channel grid formed by staggering the first flow channel and the second flow channel are adaptively adjusted. In this way, in the process that the low-temperature cooling working medium rotationally flows between the first flow channel and the second flow channel, the heat exchange area and the convective heat exchange coefficient of the cooling working medium in the heat dissipation structure are increased, and synchronous control over improvement of the heat dissipation efficiency and reduction of the flow resistance of the cooling working medium in the heat dissipation structure is achieved. The invention further provides a heat dissipation structure design method which is used for carrying out optimization design on the structure parameters of the micro-channel grid so as to rapidly and efficiently obtain the target micro-channel heat dissipation structure performance parameters and the corresponding structure parameters, and the design efficiency and the design result accuracy and reliability are improved.