10 results about "Thermophysics" patented technology

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.

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 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 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.