19 results about "Thermophysics" patented technology

The invention discloses a morphology reconstruction method for a deposition layer of a ceramic matrix composite air film cooling structure, and belongs to the field of engineering thermophysics. According to the method, on the basis of traditional fluid-solid coupling heat transfer simulation, a track of dust particles on the surface of the ceramic-based composite material air film cooling structure is simulated in combination with a dispersed phase model, deposition layer thickness distribution characteristics are obtained, and after coordinate positions and normal vectors on surface grids are obtained through a user-defined function, the deposition layer thickness distribution characteristics are obtained. And directionally moving the coordinates at different positions of the component along the normal direction by the distance of the deposition thickness to obtain coordinate values of the surface of the sediment, and sequentially reconstructing the obtained coordinate point clouds into a polygonal mesh surface and a geometric model to obtain the geometric morphology of the reconstructed deposition layer. Therefore, the comprehensive cooling efficiency and attenuation characteristics of the ceramic-based composite material air film cooling structure under the influence of the deposited particles can be accurately calculated by simulating and analyzing the influence of the deposited layer on parameters such as flow characteristics and temperature distribution on the wall surface.

The application belongs to the technical field of power engineering and engineering thermophysics, and discloses a transcritical CO2 heat pump air conditioning system integrated heat management control method and system; the method comprises the following steps: obtaining the environment temperature during high-speed train operation, the real-time state of the heat element and the heat demand; based on the comprehensive heat factor, the rotating speed of the compressor in the transcritical CO2 heat pump air conditioning system is regulated to control the total capacity of the whole vehicle; wherein, if the comprehensive heat factor is less than the first preset target, the rotating speed of the compressor is increased to increase the heat capacity of the whole vehicle; if the comprehensive heat factor is greater than or equal to the first preset target and less than or equal to the second preset target, the capacity distribution result is obtained based on the MPC control algorithm, and the capacity is adjusted; if the comprehensive heat factor is greater than the second preset target, the rotating speed of the compressor is reduced to reduce the heat capacity of the whole vehicle. The application can reduce the energy consumption under the premise of ensuring the functionality of the vehicle and the comfort of the members, and obtain the highest COP.

The application discloses a parameter adjusting method of a ceramic matrix composite plain weave preform framework applied to an aero-engine, and relates to the technical field of engineering thermophysics. The ceramic matrix composite plain weave preform framework comprises a plurality of fiber cloths, a first fiber bundle and a second fiber bundle are woven with a plurality of third fiber bundles and a plurality of fourth fiber bundles, and the parameter adjusting method comprises adjusting the size of inter-bundle pores, adjusting the pore spacing of adjacent inter-bundle pores and adjusting the size of inter-layer pores along a first direction. The inter-bundle pores are formed by weaving the plurality of fiber cloths, the inter-layer pores are formed by stacking the plurality of fiber cloths, and the inter-bundle pores and the inter-layer pores are adjusted, so that the flow of cooling gas in the seepage channel is adjusted, the cooling gas can cover the surface of a hot end component to form a gas film, and then the influence of high-temperature gas flow on the ceramic matrix composite material is reduced, so that the temperature of the hot end component is reduced, and the high-temperature corrosion of high-temperature water-oxygen-gas on the hot end component is prevented.

This invention discloses a real-time temperature field compensation and intelligent control method for the heat treatment process of rolls, belonging to the field of automatic control technology. The method includes: constructing a thermal coupling relationship matrix between different sections based on Fourier's law of thermal conductivity; constructing a boundary heat transfer dynamic compensation model based on Newton's law of cooling, calculating the convective heat transfer coefficient in real time and dynamically correcting the heating power; establishing a dynamic estimation model of the roll core temperature based on the lumped parameter method, solving the core temperature in real time and compensating for thermal inertia lag in advance; and solving the above models collaboratively, using the weighted sum of squares of surface temperature deviation and core temperature deviation as the objective function, to solve for the optimal heating power of each section under thermal coupling constraints. This invention, through the combined application of classical thermophysics theories, solves the technical problems of thermal inertia lag, large axial temperature difference, and difficulty in controlling the core-surface temperature difference during the heat treatment process of rolls, achieving precise layered and zoned control of the temperature field, and significantly improving the quality of heat treatment.

This invention discloses a method for solving the solid-thermal coupling problem of CMC materials using a probabilistic model, belonging to the field of engineering thermophysics. This method addresses the mechanical damage that occurs in high-temperature CMC components after long-term service. It establishes a representative unit cell RVE model of the CMC material at the microscale, considering the stochastic characteristics of mechanical damage, and incorporates the characteristic patterns of mechanical damage occurring in the CMC material after long-term service into a complete RVE model. Based on this model, by applying axial and radial thermal boundary conditions respectively, the axial and radial thermal conductivity of the CMC material at the microscale are obtained. The corresponding elastic modulus is calculated using the CMC material matrix crack density formula and stress-strain relationship, establishing a mapping relationship between the thermophysical parameters and mechanical performance parameters of the CMC material when mechanical damage occurs, thus realizing the solid-thermal coupling analysis and solution of the CMC material after stochastic mechanical damage. Therefore, this method can improve the accuracy of temperature field prediction for high-temperature CMC components under long-term service conditions.

This application discloses an integrated temperature and convective heat transfer coefficient sensor and its testing method, relating to the fields of aviation technology and thermal physics technology. The sensor includes a substrate, a primary heating platinum film, a secondary heating platinum film, leads, wires, and a conductive paste. The substrate is used to support a metal platinum thin film resistor structure. The metal platinum thin film resistor structure is composed of the primary heating platinum film, the secondary heating platinum film, leads, wires, and a conductive paste. The metal platinum thin film resistor structure is a cylindrical structure. The primary heating platinum film and the secondary heating platinum film are located on the upper and lower bottom surfaces of the metal platinum thin film resistor structure, respectively. The leads are arranged in vertical holes in the substrate, with one end of the leads connected to the primary heating platinum film or the secondary heating platinum film and the other end connected to the wires. The conductive paste is used to fill the vertical holes in the substrate. The device based on this application can achieve accurate measurement of multiple parameters.

The invention discloses a parameter adjusting method of a ceramic matrix composite plain woven preform framework applied to an aero-engine, and relates to the technical field of engineering thermophysics. The ceramic matrix composite plain woven preform framework comprises multiple layers of fiber cloth, a first fiber bundle and a second fiber bundle are both woven with a plurality of third fiber bundles and a plurality of fourth fiber bundles, and the parameter adjusting method comprises the steps of adjusting the size of pores between the bundles, adjusting the gap between the pores between the adjacent bundles and adjusting the size of the pores between the layers in the first direction. The method comprises the following steps: weaving multiple layers of fiber cloth to form inter-beam pores, overlapping the multiple layers of fiber cloth to form inter-layer pores, and adjusting the inter-beam pores and the inter-layer pores to adjust the flow of cooling gas in a seepage channel, so that the cooling gas can cover the surface of a hot-end component to form a gas film, and the temperature rise influence of high-temperature gas flow on a ceramic-based composite material is further reduced; therefore, the temperature of a hot end component is reduced, and high-temperature corrosion of high-temperature water-oxygen fuel gas to the hot end component is prevented.

The invention discloses an enhanced heat transfer technology of a wide rectangular folding resistance tape, and belongs to the field of mechanical equipment design and manufacturing and engineering thermophysics. The enhanced heat transfer unit comprises a shell structure composed of an upper top plate, a lower top plate, a left protective plate and a right protective plate, and a folding resistance tape core group structure. And the shell is connected with the resistance tape through an insulating porcelain sleeve column fixing sleeve piece. A double-sided small delta wing is introduced into the core group structure and cooperates with an insulating porcelain sleeve column to enhance heat exchange, a resistance tape is formed by bending wide rectangular metal to form a plurality of heat exchange channels, small delta wing vortex generators are arranged on the upper surface and the lower surface of the resistance tape in a stamping mode, and geometric parameters and an arrangement mode of the resistance tape are determined according to cooling requirements and resistance limitation. Insulation porcelain sleeve columns capable of being rapidly detached are arranged in the resistance tape, and the size and arrangement of the insulation porcelain sleeve columns are comprehensively optimized through structural strength and heat exchange capacity. The small delta wing and the insulating porcelain sleeve column jointly induce a strong longitudinal vortex in a channel and generate an interference effect, so that secondary flow is remarkably enhanced, heat exchange efficiency is improved, and the surface temperature of the resistance tape is reduced.

The invention discloses a gradient utilization method and system for dead steam waste heat of a supercritical indirect air cooling unit, and relates to the field of thermal power generation and engineering thermophysics. The method comprises the following steps: transforming a dead steam leading-out pipeline system; two-stage heating equipment is integrated through an external exhaust steam pipeline; a vacuumizing pipeline is additionally arranged; a heat supply network circulating water pipeline is additionally arranged among a heat supply network, a front condenser and a steam increasing machine condenser, and a system for gradient utilization of dead steam waste heat of the supercritical indirect air cooling unit is obtained. Determining a staged operation mode; the staged operation mode comprises the steps that heat supply network circulating water is heated only through the front condenser by means of dead steam in the initial heat supply stage; in the later period of heat supply, the front condenser conducts first-stage heating, and the steam increasing machine condenser conducts second-stage heating on heat supply network circulating water through injected dead steam; and determining a parameter dynamic adjustment strategy for optimizing the operation efficiency. According to the system, efficient gradient utilization of dead steam waste heat can be achieved.

The application discloses a radiation type high-temperature thin-film heat flow meter dynamic-static integrated calibration device and method, relates to the technical field of aviation and thermophysics, and the device is characterized in that: a radiation system is used for providing a stable radiation energy source and adjusting and converging light source radiation energy; a receiving system is used for measuring and recording heat flow density; adjacent radiation systems and receiving systems are arranged on a support system; a cooling system is used for providing cooling for the radiation systems and the receiving system; a data acquisition system is responsible for collecting and processing data from the radiation systems, the receiving systems, the cooling system and a dynamic test system; the dynamic test system is arranged at an outlet of the radiation system and is used for converting a direct-current heat flow signal output by the radiation system into a square wave heat flow signal; and the data acquisition system is used for collecting and processing data from the radiation systems, the receiving systems, the cooling system and the dynamic test system, so that the application can meet the demand for high-temperature and high-heat flow calibration of an aero-engine thin-film heat flow meter.

The application belongs to the technical field of engineering thermophysics, and discloses a one-dimensional modeling method and related device of a transcritical CO2 ejector, and the performance matrix of the transcritical CO2 ejector is obtained; the main flow fluid mass flow of the ejector and the entrainment ratio of the ejector are calculated by using the performance matrix; and the one-dimensional model of the transcritical CO2 ejector is built by using the main flow fluid mass flow of the ejector and the entrainment ratio of the ejector. The application realizes high-precision calculation of the dynamic characteristics of the ejector system, and is of great significance for the design, test and measurement of the transcritical CO2 ejector system.

The invention discloses a visual device and method for measuring evaporation of electrostatic spraying liquid drops, and belongs to the field of multiphase flow thermophysics. The device comprises a visual heating system and a transparent electrostatic spraying system, wherein the visual heating system comprises a double-layer ITO (Indium Tin Oxide) coating plate, a Joule direct current heating system, a transparent wind shield and a transparent base; the double-layer ITO plating layer plate can realize visual heating, the transparent electrode and effective isolation of heat dissipation to surrounding air due to power-on heating of the ITO plating layer; the transparent electrostatic spraying system comprises a high-voltage electrostatic generator, a valve, a displacement system, a constant liquid level system, a peristaltic pump, a double-layer water tank, an electronic balance and a nozzle; the constant liquid level system can achieve precise control and measurement of the working medium flow of electrostatic spraying. The double-layer water tank is mainly used for providing constant liquid level height and reducing unstable electrostatic spraying caused by pressure fluctuation. Through the visual heating system and the transparent electrostatic spraying system, the effect of cooling a high-temperature wall surface by electrostatic spraying can be visually detected.

The application belongs to the technical field of power engineering and engineering thermophysics, and provides a phase modifier plant heating device based on waste heat utilization and a control method thereof, which comprises a mixing device, a fresh air collecting pipeline arranged at an air inlet end of the mixing device, a phase modifier arranged at an air outlet end of the mixing device, and an exhaust air pipeline arranged at an air outlet end of the phase modifier; an exhaust air outlet is arranged at one end of the exhaust air pipeline, and the other end of the exhaust air pipeline is connected to the air inlet end of the mixing device through an return air collecting pipeline; a fan is arranged in the fresh air collecting pipeline, the exhaust air pipeline, and the return air collecting pipeline; all the fans, the phase modifier, and the mixing device are connected with a controller, and the controller is configured to control the fresh air volume and the return air volume according to the parameters of indoor air and outdoor air in the plant, accurately evaluate the flow and heat of the exhaust air, the return air, and the fresh air of the phase modifier, and has a good heating effect and can efficiently recover the waste heat generated in the operation process of the phase modifier.

The application discloses a kind of persistent non-energy consumption adsorption water production device, belongs to the field of engineering thermophysics.The application is simple in structure, and based on bridge type thermal rectification, can continuously and cyclically work, converts periodic solar energy and radiation refrigeration into 24 hours constant high temperature and low temperature, carries out multiple water absorption and release cycles within a day, and greatly improves water production.

The invention discloses a method and a device for calculating the thermophysical property of a gasification working medium based on a Wirie equation and a residual entropy scaling method, which can be applied to the technical field of power engineering and engineering thermophysics. The method comprises the following steps: calculating a comparison second Wirie coefficient and a comparison third Wirie coefficient of each component based on a state parameter of a gasification working medium and a physical property parameter of each component; calculating a second Wirie coefficient and a third Wirie coefficient of the gasification working medium based on the above parameters by using a mixing rule; calculating the density of the gasification working medium by adopting a Wirie equation according to the state parameters, the second Wirie coefficient and the third Wirie coefficient; according to the state parameter, the density, the second Wirie coefficient and the third Wirie coefficient, the thermodynamic property of the gasification working medium is calculated; on the basis of the physical property parameters and the state parameters of all the components, the rarefied gas transportation property of the gasification working medium is calculated; and calculating the transportation property of the gasification working medium by using a residual entropy scaling method according to the residual entropy and the transportation property of the rarefied gas.

The invention provides a method and system for predicting the mixed convective heat transfer performance of a heat exchanger, and relates to the technical field of heat transfer science and engineering thermophysics, and the method comprises the steps: obtaining pure natural convective experimental data, and fitting a natural convective heat transfer correlation formula; obtaining mixed convection experiment data; constructing a hybrid convective heat transfer correlation type prototype based on a nonlinear superposition model; substituting the natural convective heat transfer correlation into the prototype, traversing the coupling indexes, reversely separating out forced convective components from the mixed data, and fitting to obtain forced convective heat transfer correlation and errors under each coupling index; screening an optimal coupling index and an optimal forced convective heat transfer correlation formula corresponding to the optimal coupling index based on an optimization criterion, and substituting the optimal coupling index and the optimal forced convective heat transfer correlation formula into the prototype to obtain a final mixed convective heat transfer correlation formula; and obtaining a Rayleigh number and a Reynolds number of a to-be-predicted working condition, and substituting the Rayleigh number and the Reynolds number into the final correlation formula to predict the According to the method, the mixed convection heat transfer performance of the heat exchanger can be accurately predicted under the condition that only pure natural convection and mixed convection data exist.

The application provides a heat exchanger mixed convection heat transfer performance prediction method and system, and relates to the technical field of heat transfer and engineering thermophysics. The method comprises the following steps: obtaining pure natural convection experimental data and fitting a natural convection heat transfer correlation formula; obtaining mixed convection experimental data; constructing a mixed convection heat transfer correlation formula prototype based on a nonlinear superposition model; substituting the natural convection heat transfer correlation formula into the prototype, traversing the coupling index, and inversely separating the forced convection component from the mixed data to fit the forced convection heat transfer correlation formula and the error under each coupling index; screening the optimal coupling index and the corresponding optimal forced convection heat transfer correlation formula based on an optimization criterion, substituting the optimal coupling index and the corresponding optimal forced convection heat transfer correlation formula into the prototype to obtain the final mixed convection heat transfer correlation formula; obtaining the Rayleigh number and the Reynolds number of a to-be-predicted working condition, and substituting the Rayleigh number and the Reynolds number into the final correlation formula to predict the mixed convection Nusselt number. The application realizes accurate prediction of the heat exchanger mixed convection heat transfer performance under the condition of only pure natural convection and mixed convection data.

The application discloses a kind of passive thermal management technology for spacecraft such as satellite, it is related to engineering thermophysics technical field, solve the following problems of existing satellite thermal management technology:1.Satellite needs not only heat dissipation in high temperature under the direct sunlight, but also needs to maintain a certain temperature when there is no solar radiation to avoid internal device damage.Static spectral surface radiation heat dissipation method cannot regulate heat dissipation power, only additional energy consumption can be heated when low temperature is kept warm.2.Dynamic spectrum adaptive heat dissipation can reduce the radiation heat dissipation power when low temperature, but existing materials have the following problems: spectrum is not perfect, cannot be prepared on a large scale, life is low in space working condition and the like.The application is based on static spectrum surface, modularization is introduced into heat switch device of different trigger conditions of radiator, so as to adjust heat dissipation thermal resistance according to temperature, realize passive spacecraft temperature management.In addition, heat dissipation coating adopts modular design, and can be adapted to the space folding of spacecraft components.

The invention relates to the field of engineering thermophysics, and provides a plate heat exchanger with a core plate with a remarkable flow guiding effect, the heat exchanger comprises a heat exchanger fluid inlet, a flow guiding area, a fluid main heat exchange area and a heat exchanger fluid outlet, the flow guiding area comprises a flow guiding groove area and a flow channel area, and the fluid main heat exchange area is arranged in the central area of the heat exchanger. Flow channel areas are arranged on the left side and the right side of the heat exchanger correspondingly. The heat exchanger fluid inlet and the heat exchanger fluid outlet communicate with the flow channel areas through the diversion trench areas. The diversion trench area comprises diversion trench top and bottom optimization areas, and the diversion trench top and bottom optimization areas are located on the top side of a fluid inlet of the heat exchanger and / or located on the top side and the bottom side of a fluid outlet of the heat exchanger. The flow channel area comprises a flow channel lower optimization area which is located on the lower side of the heat exchanger flow channel area. Therefore, the structure of the heat exchanger is improved, and the maximum non-uniform rate and the comprehensive flow non-uniform amplitude of heat exchange fluid flowing through the interior are both reduced. Finally, the purpose of more uniform flow distribution in the flow channel is achieved.