40 results about "Heat transfer problem" patented technology

The invention discloses a double-fluid topological optimization construction method and system for a printed circuit board heat exchanger, and the method comprises the steps: building a periodic boundary condition and a symmetric boundary condition of the printed circuit board heat exchanger based on the periodicity and symmetry of the height direction and the vertical flowing direction of the printed circuit board heat exchanger and the known full-scale model of the printed circuit board heat exchanger; selecting a typical flow channel unit of the three-dimensional printed circuit board type heat exchanger, and constructing a three-dimensional single flow channel model; then, according to the three-dimensional single-flow-channel model, a topological optimization material characterization method of a coupling variable density method and a three-dimensional flow heat transfer control equation, dimensionality reduction is conducted on the three-dimensional flow heat transfer problem to a two-dimensional design domain, and a two-fluid flow heat transfer dimensionality reduction model is formed; and finally, according to the two-fluid flow heat transfer dimension reduction model, coupling a variable density method topological optimization objective function and a filtering projection post-processing method, obtaining distribution of solid fins and fluid flow channels in the cold side fluid flow channel and the hot side fluid flow channel, namely a two-fluid topological optimization model. According to the method, topological optimization is carried out with heat exchange enhancement and flow resistance reduction as targets on the basis of the method, distribution of fluid fins in a design domain is obtained, a novel topological channel structure is constructed, and the performance of the printed circuit board type heat exchanger is improved; compared with a traditional structure, the total heat exchange amount can be increased by 13.1% under the condition that the pump work of the heat exchanger is reduced by 38%.

The invention relates to a topological optimization design method for a two-fluid heat exchanger structure based on a multi-material model. The method comprises the following steps: defining a topological optimization design domain and design variables of a heat exchanger, wherein the topological optimization design domain comprises hot fluid and cold fluid flowing areas; with maximization of heat exchange amount in a design domain and minimization of inlet and outlet pressure drop as optimization objectives, an objective function is established, constraint conditions are set, and a topological optimization model is constructed; respectively solving control equations of flow problems of the cold fluid and the hot fluid, solving corresponding topological optimization models, and obtaining corresponding velocity fields; solving a heat transfer problem by using a heat conduction equation according to a combined velocity field obtained by superposing the two velocity fields; sensitivity analysis is carried out according to the solution of the heat transfer problem, and design variables are updated through a topological optimization algorithm according to a sensitivity analysis result; and iteratively updating the design variable for multiple times until the objective function is converged and the preset design requirement is met. The problem of heat exchanger structure optimization in different scenes is efficiently solved.

The present invention discloses a finite element calculation method for solidification heat transfer during continuous casting of round billets, and relates to the technical field of steel continuous casting. The method comprises establishing a two-dimensional geometric model of the round billet according to the cross-sectional dimensions of the round billet; meshing the two-dimensional geometric model of the round billet to construct a two-dimensional finite element model of the round billet; establishing a two-dimensional finite element solidification heat transfer model of the round billet in view of the problem of solidification heat transfer during continuous casting of the round billet; and calculating the temperature field change during continuous casting using the two-dimensional finite element solidification heat transfer model of the round billet. The method fully considers the arc-shaped boundary of the round billet, and adopts general quadrilateral units. When the grid is dense enough, the arbitrary curve of the boundary of the calculation area can be simulated by a segmented straight line on the boundary, while avoiding the serrated boundary caused by the use of rectangular units; the calculation accuracy of the calculation using the finite element method is improved compared with the calculation accuracy of the finite difference method and the like; the appropriate boundary conditions are selected according to the different cooling conditions of the crystallizer and the secondary cooling zone, so as to more accurately simulate the heat transfer phenomenon during the actual continuous casting production process of the round billet.

The present invention discloses a non-local method for the heat transfer problem of a cracked functional gradient plate, comprising the following steps: determining the parameters of the functional gradient material and the size of the plate; determining the initial crack position; discretizing the solid model with a suitable grid spacing; determining the control equation of the temperature field of the functional gradient plate and setting the boundary conditions of the model; based on the peridynamic differential operator theory, the control equation and the boundary conditions are converted into a non-local form, discretized and constructed to solve the equation group; solve the equation group to obtain the temperature value of each material point. For cracked heat transfer engineering components, the prediction of the heat flux singularity at the crack tip by the present invention can effectively prevent and reduce the damage to the structure caused by thermal damage and thermal fracture, and increase the service life of the engineering components.

A multi-fidelity topological optimization method, system, device and medium for a microchannel flow boiling process, and the method comprises the steps: firstly carrying out low-fidelity topological optimization on a single-phase laminar flow convective heat transfer process to generate a group of candidate topological optimization structures; then calculating the speed, temperature and two-phase distribution in a single-phase heat transfer process and a flow boiling heat transfer process on the basis of a high-fidelity flow boiling numerical model, and constructing a novel objective function capable of reflecting flow boiling heat transfer characteristics on the basis of leading factors of the flow boiling heat transfer problem in the microchannel; and finally, directly generating a topological optimization structure under a low-fidelity condition based on the new objective function. Aiming at the defect that an existing topological optimization algorithm cannot directly optimize the flow boiling heat transfer problem, rapid and accurate multi-fidelity topological optimization is realized by constructing a novel objective function capable of reflecting the flow boiling heat transfer characteristics; according to the designed topological optimization structure, local hot spots are eliminated, thermal resistance is reduced, and temperature uniformity is improved.

The simulation method for wall-adhering flow heat transfer of the model in the flow channel based on the STL format is provided, the method is suitable for simulation of a core disturbance structure of a light efficient heat exchanger in the aviation field, and the flow heat exchange performance of the wall-adhering insertion disturbance structure in the flow channel under the turbulence working condition can be accurately predicted. The method comprises the steps of establishing a three-dimensional model in an STL format, performing grid division on the model serving as a disturbance structure in a flow channel, and performing computational fluid mechanics simulation. According to the method, by developing a whole set of method from three-dimensional model establishment to CFD simulation, wall attachment processing of the STL format model is achieved, and the problems of flowing and heat transfer at the junction of the wall face and the disturbance structure are effectively solved. A set of method is provided for directly performing grid division on the model in the STL format, and compared with traditional operation of converting the three-dimensional model in the STL format into an entity format and performing wall surface seam reserving, the method is closer to application under the real working condition. And an effective method is provided for promoting wide-range application of the three-dimensional model in the STL format in the CFD field.

The invention discloses a fluid-solid coupling heat transfer simulation method and device based on a compressible ghost point immersion boundary method and a medium. The method comprises the following steps: acquiring a flow field and a solid temperature field in the (st-1) th step; obtaining the position and the speed of the mass center of the solid and the angular speed of the solid in the (st-1) th step; determining the attributes of grid nodes; if a new fluid node exists, calculating a fluid variable value at the new fluid node; calculating a solid centroid acceleration, a solid angular acceleration and a solid speed at a grid node in the solid; calculating a flow field ghost point variable value; if a new solid node appears, calculating the temperature value of the solid at the new solid node; calculating a solid temperature ghost point value; updating a solid temperature field and a flow field; and when the simulation step number is reached, ending the whole simulation process. The fluid-solid coupling heat transfer simulation method based on the compressible ghost point immersion boundary method is suitable for solving the problem of coupling heat transfer between a static or moving object and a compressible flow.

The invention discloses a high-order model control method based on a linearization model and GA-ADRC, and relates to the field of heat exchanger control simulation, and the method comprises the steps: constructing a single-shell-pass single-tube-pass heat exchanger model which comprises a shell and a heat exchange space, the heat exchange space is divided into a shell pass region and a tube pass region, and the shell pass region is internally provided with a plurality of baffle plates; carrying out heat balance analysis to obtain a dynamic equation of each heat exchange link of the heat exchanger, carrying out discretization processing, and carrying out linearization processing on the mass flow rate and the temperature of the shell pass hot fluid to realize decoupling; and an ESO state observer is arranged to estimate the state variable of the heat exchanger in real time, and the single-shell-side and single-tube-side heat exchanger model is controlled through a GA-ADRC-based nonlinear model control method. According to the method, the complex heat transfer problem can be linearized, a GA-ADRC controller independent of an accurate model is designed, the actual nonlinear model can be successfully adapted, the adjustment time is shortened, and the control precision and the anti-interference capability are effectively improved.

The present application relates to the technical field of nuclear reactor thermal hydraulic, in particular, to a rectangular fuel assembly coupling heat transfer coupling method and system, medium. The method or system provided by the present application mainly includes obtaining the surface heat flux density distribution of the fuel plate; performing the iteration calculation of the coolant flow distribution characteristics and the fuel plate heat conduction characteristics; judging whether the iteration calculation of the fuel plate heat conduction characteristics is completed. Through the above method, for the refined analysis and calculation requirement of the rectangular fuel assembly flow heat transfer, a detailed coupling heat transfer calculation method and process are proposed, which can be used for accurate solution of the above coupling heat transfer problem. The present application can be used as the algorithm basis for the development of the core thermal hydraulic program of the advanced research reactor (such as CARR). The calculation accuracy of the fuel assembly can be provided, so as to release the thermal design margin. It plays an important role in improving the overall performance of the research reactor.

The present invention relates to the technical field of welding robots, and in particular to a multi-angle welding control method and system for welding robots. The method first obtains each welding point of a device to be welded corresponding to the welding robot; analyzes the positional relationship between each welding point and other welding points, and determines the distance influence value; determines the welding influence value according to the temperature to be welded and the time to be welded corresponding to each welding point; combines the distance influence value and the welding influence value to determine the heat transferability of the welding point, performs path planning on the welding point, and obtains the optimal welding path; performs pulse welding on the welding point whose transfer angle does not meet the conditions when transferring the welding path in the optimal welding path, and controls the low-energy pulse welding duration of the pulse welding of the welding robot. The present invention controls the path, welding method and welding duration to achieve the purpose of avoiding quality defects of the device to be welded due to heat transfer problems.

The invention belongs to the technical field of energy conservation in the iron and steel industry, and particularly relates to a system and method for improving heat exchange of an internal combustion hot blast stove through flue gas reuse. Comprising hot-blast stoves, smoke exhaust branch pipes, a smoke exhaust header pipe and a chimney, hot air pipelines of the hot-blast stoves are connected with blast furnaces, each hot-blast stove is connected with the smoke exhaust header pipe through the corresponding smoke exhaust branch pipe, and the smoke exhaust header pipe is connected with the chimney; a regulating valve and a check valve are arranged on the smoke exhaust branch pipe, a smoke recycling pipeline is led out between the regulating valve and the check valve, the smoke recycling pipeline is connected into the hot-blast stove, the connecting position is above the gas pipeline and the combustion-supporting air pipeline, and the smoke recycling pipeline is bent upwards to be the same as the flame direction after being connected into the hot-blast stove. The check valve is close to one side of the smoke exhaust header pipe. The problem that convective heat transfer of checker bricks of the hot blast stove is weakened due to reduction of the smoke amount in the arch crown heat preservation and heating stage of the internal combustion type hot blast stove is solved through smoke recycling, and the hot air temperature can be effectively increased by 5 DEG C or above.

The invention discloses a variable-physical-condition heat transfer solving method and device, equipment and a storage medium. The method comprises the steps that the physical condition of a heat transfer object is obtained; inputting the physical conditions into a trained solving network model; determining a green function and a green function gradient corresponding to the heat transfer object by solving the network model; and determining an integral solution expression based on the Green function and the Green function gradient, and determining a heat transfer solution result corresponding to the heat transfer object through the integral solution expression. According to the method, the integration form of the Green function and the deep learning technology are combined, and the analysis characteristics of the Green function are utilized to reduce the data requirement for solving network model training, so that the heat transfer problem solving cost can be reduced. Meanwhile, by combining the integral form of the Green function and the deep learning technology, the solving efficiency and the solving precision of the heat transfer problem can be improved, and the heat transfer analysis requirement can be better met in real time.

The present invention relates to a method for topological optimization design of a dual-fluid heat exchanger structure based on a multi-material model, comprising: defining a topological optimization design domain and design variables of the heat exchanger including the flow areas of the hot and cold fluids; establishing an objective function and setting constraints, with the optimization objectives of maximizing the heat transfer within the design domain and minimizing the inlet and outlet pressure drops, and constructing a topological optimization model; solving the governing equations for the flow problems of the cold and hot fluids respectively, solving the corresponding topological optimization models, and obtaining the corresponding velocity fields; solving the heat transfer problem using the heat conduction equation based on the combined velocity field obtained by superimposing the two velocity fields; performing a sensitivity analysis based on the solution to the heat transfer problem, and updating the design variables using a topological optimization algorithm based on the results of the sensitivity analysis; and iterating and updating the design variables multiple times until the objective function converges and meets the predetermined design requirements. The present invention efficiently solves the problem of heat exchanger structure optimization in different scenarios.

The application discloses an SCR system conjugate heat transfer calculation method based on OpenFOAM secondary development, and the secondary development is carried out based on an open source CFD library OpenFOAM; a temperature solving method of a solid field is implanted on the basis of an original fluid field solving method, so as to solve the problem that a solver for the flow field conjugate heat transfer characteristics of a diesel engine aftertreatment system has not been developed maturely in the prior art. On the basis of the gas field solver of the computational fluid dynamics open source library OpenFOAM, the heat conduction calculation method of the solid field is implanted, the numerical calculation of the diesel engine exhaust aftertreatment SCR system conjugate heat transfer problem is realized, and the application range is effectively widened.

The invention provides a method for determining a cold convective heat transfer coefficient and an equivalent heat transfer area of rolled cooling water, and relates to the technical field of hot rolling. The method comprises the following steps: firstly, acquiring key production process parameters in a cooling process after hot continuous rolling strip steel rolling and geometric parameters and thermophysical parameters of the strip steel; determining the water-cooling convective heat transfer coefficient of the upper and lower surfaces of the strip steel and the value range of the corresponding equivalent heat transfer area to form a search space; randomly selecting a plurality of groups of strip steel upper and lower surface water-cooling convective heat transfer coefficients and parameter combinations of corresponding equivalent heat transfer areas in the search space as feasible solutions for solving the problem; the strip steel is divided into a plurality of samples in the length direction, three-dimensional heat transfer in the cooling process after rolling is simplified into one-dimensional heat transfer in the thickness direction, a one-dimensional unsteady state heat conduction differential equation is established and solved to obtain the final cooling temperature of all the strip steel samples, and the fitness of the group of feasible solutions is calculated; and further obtaining a water-cooling convective heat transfer coefficient in the cooling process after rolling and a corresponding equivalent heat transfer area.

The application discloses a double-fluid topology optimization construction method and system of a printed circuit board heat exchanger, and is characterized in that the printed circuit board heat exchanger has periodicity and symmetry in the height direction and the vertical flow direction, the full-scale model of the printed circuit board heat exchanger is known, the periodic boundary condition and the symmetric boundary condition of the printed circuit board heat exchanger are established, and a typical flow channel unit of the three-dimensional printed circuit board heat exchanger is selected to construct a three-dimensional single-flow channel model; then, according to the three-dimensional single-flow channel model, a topology optimization material representation method of a variable density method and a three-dimensional flow heat transfer control equation are coupled, a three-dimensional flow heat transfer problem is reduced to a two-dimensional design domain, and a double-fluid flow heat transfer dimension reduction model is formed; finally, according to the double-fluid flow heat transfer dimension reduction model, a variable density method topology optimization objective function and a filtering projection post-processing method are coupled to obtain the distribution of solid fins and fluid flow channels in the cold-side fluid flow channel and the hot-side fluid flow channel, that is, a double-fluid topology optimization model; the method is based on the above method to realize topology optimization with the aim of strengthening heat exchange and reducing flow resistance, to obtain the distribution of fluid fins in the design domain, to construct a new topology channel structure, and to improve the performance of the printed circuit board heat exchanger; compared with a traditional structure, the application can realize the improvement of 13.1% of the total heat exchange capacity under the condition of reducing the pump work of the heat exchanger by 38%.

The present invention relates to the technical field of heat transfer inversion, and particularly to a transient distributed heat load alternating direction weighted fuzzy inversion method. It includes: Step 1: Establish a heat transfer model of the object to be measured, arrange N m temperature measurement points on the surface to be measured, initialize the transient distributed heat load detection problem, and give the initial guess value matrix #imgabs0# of the boundary heat load. Set the initial value of the iteration number identifier of the inversion process to n = 0; Step 2: Solve the forward heat transfer problem according to the guess value of #imgabs1# to obtain the calculated temperature value matrix #imgabs2# at the measurement points, calculate the temperature error matrix #imgabs3#, and judge whether E n satisfies the iteration stop condition. If it is satisfied, the iteration stops, and the distributed heat load is output. The method of the present invention significantly reduces the requirement for the number of measurement points, is not sensitive to the initial guess value of the boundary heat load, and has good anti-interference ability to measurement errors.

The application discloses a kind of MEMS infrared light source based on heat insulation vacuum cavity and preparation method thereof, and infrared light source includes infrared light source main body and silicon cap bonded above it, and infrared light source main body includes silicon substrate, mask layer, resistance layer and insulating dielectric layer sequentially arranged from bottom to top;Resistance layer is formed by metal stripping process Graphical resistance structure;Insulating dielectric layer is annular;Resistance layer pad area is deposited with electrode layer;The upper surface of silicon substrate is etched out heat insulation groove;Silicon cap is bonded above insulating dielectric layer, and vacuum cavity is formed between silicon cap and infrared light source main body, and the inner surface of silicon cap is deposited with anti-reflection film.The infrared light source and preparation method disclosed in the application can solve the heat transfer problem of MEMS infrared light source, can effectively reduce the heat loss caused by heat convection between light source and air, improve the electro-optical conversion efficiency and thermal radiation of light source, reduce the power consumption of light source, and improve the stability in actual working environment.

The invention discloses a finite element calculation method for the solidification heat transfer of beam blank continuous casting, and relates to the technical field of steel continuous casting. The method comprises establishing a 1 / 2 beam blank two-dimensional geometric model according to the cross-sectional size of the beam blank; meshing the 1 / 2 beam blank two-dimensional geometric model to establish a 1 / 2 beam blank two-dimensional finite element model; establishing a 1 / 2 beam blank two-dimensional finite element solidification heat transfer model for the beam blank in view of the solidification heat transfer problem of the beam blank continuous casting; and calculating the temperature field change during the continuous casting process using the 1 / 2 beam blank two-dimensional finite element solidification heat transfer model. The invention fully considers the complex cross-sectional shape of the beam blank, and adopts triangular units and general quadrilateral units to better simulate the actual beam blank cross section; selects appropriate boundary conditions according to different cold zones, more accurately simulates the solidification heat transfer of the entire process of beam blank continuous casting production, and describes the temperature field change during the beam blank continuous casting process.

The utility model relates to the field of fasteners, in particular to a connecting structure and a pot. The connecting structure comprises a plug pin assembly, a shaft sleeve assembly, a snap spring mechanism and a pot lug, the shaft sleeve assembly is provided with an axial through hole, the plug pin assembly is inserted into the axial through hole, the snap spring mechanism is arranged on the plug pin assembly in a sleeving mode, the outer wall of the snap spring mechanism abuts against the inner wall of the axial through hole, and the pot lug is arranged on the shaft sleeve assembly. The clamping spring mechanism is arranged on the shaft sleeve assembly so that the plug pin assembly and the shaft sleeve assembly can be fixed, reinforcing ribs extending in the circumferential direction are arranged on the outer wall of the clamping spring mechanism, and the pot lugs are fixedly connected with the plug pin assembly. The circumferential reinforcing ribs on the outer wall of the snap spring mechanism improve the deformation resistance and ensure that the elastic performance of the snap spring is stable in a high-temperature environment; the reinforcing ribs increase the friction force between the clamping spring and the shaft sleeve assembly, and it is ensured that the clamping spring cannot rotate accidentally in the using process; by providing stable connection and allowing the bolt assembly to be fixed at a specific angle, the heat transfer problem caused by unstable connection or random rotation is reduced.

The utility model discloses an intelligent low-temperature anti-corrosion pipeline for sulfur-containing flue gas, and particularly relates to the technical field of pipeline corrosion prevention, the intelligent low-temperature anti-corrosion pipeline for the sulfur-containing flue gas comprises a pipeline, a mounting seat is arranged on the outer side of the pipeline, and a temperature instrument, an acid dew point instrument, a heating frame and an intelligent controller are matched for use, so that the acid dew point value of the sulfur-containing flue gas can be monitored on line in real time; the temperature of the sulfur-containing flue gas is always above the acid dew point, so that the occurrence of low-temperature corrosion accidents of the sulfur-containing flue gas is prevented, the pipeline corrosion prevention effect is achieved, the heat transfer problem of the sulfur-containing flue gas is not influenced, and the problems of matching and compatibility between a coating or a coating film and an existing pipeline are solved; according to the utility model, through the fixing mechanism, the mounting seat and the pipeline can be conveniently and quickly connected and fixed, and the mounting seat and the pipeline can be conveniently disassembled, so that the temperature instrument, the acid dew point instrument and the heating frame can be maintained, repaired or replaced; and the sealing assembly is arranged, so that the sealing performance among the temperature instrument, the acid dew point instrument, the heating frame and the pipeline can be improved.

The present invention provides a method for determining the water-cooled convection heat transfer coefficient and equivalent heat transfer area for post-rolling cooling, and relates to the field of hot rolling technology. First, key production process parameters of the post-rolling cooling process of hot-rolled strip steel and geometric parameters and thermophysical parameters of the strip steel are collected; the value range of the water-cooled convection heat transfer coefficient and the corresponding equivalent heat transfer area of ​​the upper and lower surfaces of the strip steel are determined to form a search space; multiple groups of parameter combinations of the water-cooled convection heat transfer coefficient and the corresponding equivalent heat transfer area of ​​the upper and lower surfaces of the strip steel are randomly selected in the search space as feasible solutions to the problem; the strip steel is divided into multiple samples along the length direction, and the three-dimensional heat transfer of the post-rolling cooling process is simplified to a one-dimensional heat transfer problem along the thickness direction, a one-dimensional non-steady-state heat conduction differential equation is established and solved to obtain the final cooling temperature of all strip steel samples, and the fitness of this group of feasible solutions is calculated; and then the water-cooled convection heat transfer coefficient and the corresponding equivalent heat transfer area of ​​the post-rolling cooling process are obtained.

The invention discloses a simulation method and system for wind flow heat transfer of a high-ground-temperature tunnel. The method comprises the following steps: constructing a tunnel geometric model containing different heat insulation structures by utilizing drawing software; importing the tunnel geometric model into numerical simulation software, constructing entity units in the numerical simulation software, and dividing grids; initial conditions and boundary conditions are set, numerical simulation is conducted through a finite difference method, and the air flow heat transfer processes in different construction stages and under the heat insulation structure are simulated; and analyzing a numerical simulation result, generating a distribution cloud picture of a temperature field, comparing heat transfer effects of different construction stages and the heat insulation structure, and determining an optimal design scheme. According to the method, the wind flow heat transfer problem in the high-ground-temperature tunnel is systematically solved through tunnel geometric model building, parameter setting, numerical simulation and result analysis, scientific basis and actual guidance are provided for tunnel engineering by simulating different heat insulation structures and the heat transfer process of the construction stage, and the safety and efficiency of the engineering are improved.

The invention relates to the technical field of nuclear reactor thermal hydraulic power, in particular to a rectangular fuel assembly coupling and heat transfer coupling method and system and a medium. The method or the system provided by the invention mainly comprises the following steps: acquiring the surface heat flux density distribution of the fuel plate; carrying out iterative calculation on coolant flow distribution characteristics and fuel plate heat conduction characteristics; and judging whether iteration of the heat conduction characteristic iterative calculation of the fuel plate is completed. By means of the method, the detailed coupling heat transfer calculation method and process are provided according to the flow heat transfer fine analysis calculation requirement of the rectangular fuel assembly, and the method and process can be used for accurately solving the coupling heat transfer problem. The method provided by the invention can be used as an algorithm basis for advanced research of development of a reactor core thermal hydraulic program of a reactor (such as CARR). Computational accuracy of the fuel assembly may be provided, thereby releasing thermotechnical design margin. The method plays an important role in improving the overall performance of the research reactor.

The present invention relates to the field of chemical production technology, and in particular to a production process and system for polyketone resin. The present invention further improves the mass transfer and heat transfer effects by coordinating the temperature control, stirring and external circulation heat exchange in the reaction kettle during the reaction process, so that the temperature of the slurry material in the reaction kettle is maintained within an appropriate range, thereby avoiding the degradation of the quality of the polyketone resin caused by heat transfer problems; by setting a slurry washing process, the catalyst precious metals wrapped on the surface and inside of the polyketone resin are fully washed into the washing medium, which greatly reduces the residual amount of the catalyst precious metals in the obtained polyketone resin, and can fully recover the precious metals, the system runs stably, is easy to operate, and has good economic benefits.

The invention relates to the technical field of battery monomer shells, in particular to a heat insulation shell of an energy storage battery monomer and a preparation method of the heat insulation shell. The method comprises the steps that a shell of an energy storage battery monomer is subjected to surface cleaning treatment, the treated shell serves as an anode workpiece to be placed in electrolyte of an electrolysis device, voltage is applied between the anode workpiece and a cathode, and the applied voltage is constant voltage or stepping voltage; the surface of the thermal insulation shell is provided with a porous membrane structure, the out-of-plane heat conductivity coefficient of the thermal insulation shell is lower than 125 W / (m.K), and the thermal insulation shell has thermal insulation performance and can solve the problem of heat transfer between monomers caused by battery thermal runaway.

The application provides an oil-cooled magnetic flux switching permanent magnet traction motor thermal analysis method and device, relates to the motor design technical field, and includes the following steps: determining the geometric parameters and material parameters of each component in the motor to be analyzed; abstracting and dividing each component in physics into at least one lumped thermodynamic node; determining the connection mode of each lumped thermodynamic node based on the heat transfer characteristics of each component, and establishing a parameter matrix; determining the key heat transfer parameters of the motor to be analyzed; and constructing a lumped parameter thermal network model based on the lumped thermodynamic nodes and the parameter matrix and the key heat transfer parameters. The method and device provided by the application convert the complex continuous heat transfer problem into a discrete problem for solving, have fast calculation, greatly improve the calculation efficiency, can be reanalyzed only by modifying the corresponding parameters, provide convenience for fast thermal analysis and optimization of the motor in the early design stage, and improve the thermal analysis efficiency and accuracy.

This invention designs a finite volume method for calculating the solidification heat transfer of irregular cross-section continuously cast billets. First, a 1 / 2 continuous casting billet simulation domain is constructed based on the cross-sectional dimensions of the irregular cross-section billet. An unstructured mesh is then created within this domain, and the mesh information is saved. Next, an unstructured finite volume heat transfer model is established to address the solidification heat transfer problem during continuous casting. Finally, this model is used to simulate the solidification heat transfer phenomenon of irregular continuously cast billets during the continuous casting process. The volume method is used for calculation, which improves the calculation speed compared to the finite element method. Appropriate boundary conditions are selected based on different cold zones to more accurately simulate the solidification heat transfer throughout the entire continuous casting process of irregular continuously cast billets. The method fully considers the actual situation of continuous casting of irregular billets, describes the temperature field changes during the continuous casting process, and thus provides support for the uniform cooling of irregular continuously cast billets and the improvement of their quality.

The invention discloses a compact radio frequency front end expansion layer liquid cooling heat dissipation system and a thermal control evaluation method thereof, an expansion layer of the system is arranged on an array plane frame, and an antenna and a radio frequency transmit-receive assembly are respectively connected with the expansion layer. And an array plane frame liquid cooling flow channel for cooling liquid circulation and a mounting back plate attached to the expansion layer are arranged in the array plane frame. According to the scheme, heat flow paths of the assembly end and the antenna end are creatively distinguished, heat is efficiently conducted out of the high-density winding layer and sent to the liquid cooling system to be dissipated, meanwhile, an original frame of the system is fully utilized as a main heat dissipation channel, the antenna area is subjected to heat dissipation through the integrated heat pipe, the size and weight of the system do not need to be greatly increased, and cost is reduced. The characteristics of compactness and high density of a radio frequency front end are perfectly matched; in addition, the complex three-dimensional fluid-solid coupling heat transfer problem can be simplified into a lumped parameter model easy to calculate, multi-round iteration and scheme comparison can be rapidly carried out in the design stage, the research and development period is greatly shortened, and the design success rate is guaranteed.

The present invention discloses a cable temperature rise test method considering axial heat transfer of cable joints, which relates to the technical field of research on heat transfer and temperature rise characteristics of high-voltage cable joints. A physical model including the cable joint and the cables connected to both ends thereof is established; under the set critical working conditions, a corresponding temperature distribution model under different current conditions is established by using the physical model to determine the axial heat transfer range of the cable joint and the cable, and accordingly determine the length of the cable to be tested; temperature sensors are arranged at equal intervals on the cable joint and the determined length of the cable, and a temperature compensation device is arranged at the end of the cable to measure the conductor temperatures on the cable joint and the cable. The present invention simultaneously considers the axial heat transfer problem of the cable joint and the cost problem of experimental equipment, and uses the cable line as short as possible to reduce the cost of the experimental platform while eliminating the influence of the axial heat transfer of the joint on the temperature rise of the cable body.