35 results about "Thermophysics" patented technology

A method of identifying a flaw in a part is provided that includes vibrating a part to induce heat. The heat originates in any flaws in the part. A thermal image is obtained using, for example, an infrared camera. A mathematical representation of the thermophysics, such as the heat conduction or thermal energy equations using the boundary element method or finite element method is used to identify a source and an intensity of the heat identified with the thermal image. Using the source and intensity of the heat, flaw characteristics for the part can be determined. The method is employed using an inspection system that includes a vibration device for vibrating the part. An imaging device, such as an infrared camera, measures temperature on the surface of the part. An assumption is made or additional measurements are taken to obtain values for surface flux or surface heat transfer coefficients. A processor communicates with the imaging device for receiving the surface temperature. The processor includes computer memory having part characteristics and mathematical equations. The processor uses the measured surface temperature, assumed or measured heat flux or heat transfer coefficients, part characteristics and mathematical equations to determine the flaw characteristics in the part.

The invention discloses a calculation method of a rapid heat conduction coefficient of a period-like distribution unidirectional fiber toughening composite material, and belongs to the technical field of engineering thermophysics. The calculation method of the rapid heat conduction coefficient of the period-like distribution unidirectional fiber toughening composite material comprises the following steps: putting forward a new anisotropy heat conduction coefficient calculation theory-experience expression LNN (Linear Neural Network) model, and giving a specific expression form; performing finite element simulation on a micro representative unit, and fitting to obtain a correction coefficient n in the LNN model through calculating data; and transferring the obtained correction coefficient n to a correction term Psinew, and determining a final unidirectional fiber anisotropy heat conduction coefficient calculation theory-experience expression of an LNN correction model, calculating the rapid heat conduction coefficient of the unidirectional fiber toughening composite material. Compared with an existing method, the calculation method of the rapid heat conduction coefficient of the period-like distribution unidirectional fiber toughening composite material has the advantage that the precision is greatly improved, and the corresponding anisotropy heat conduction coefficient can be rapidly calculated.

The invention belongs to the technical field of energy utilization and engineering thermophysics, and particularly relates to a dry-wet unified cooling tower adopting a natural ventilation and composite running mode and application of the dry-wet unified cooling tower. The dry-wet unified cooling tower comprises a tower body, a supporting structure, a dry cooling section, a wet cooling section and a flow distribution system; a dual-curve manner is adopted in the tower body, and the tower body is supported to the ground through a supporting structure; the dry cooling section and the wet cooling section are integrally distributed in one cooling tower in the vertical direction; the dry cooling section is located above the wet cooling section; the dry cooling section comprises a cooling triangle and a dry cooling section louver; the wet cooling section comprises a water removing device, a water distribution system, a padding area, a water collecting pool and a wet cooling section louver; and the flow distribution system comprises a total inlet and outlet pipe, a dry cooling section inlet and outlet pipe, a wet cooling section inlet and outlet pipe, a valve and a circulating pump. According to the dry-wet unified cooling tower and application, wasted work of a draught fan is not needed, the cooling efficiency is high, the lower tower exiting water temperature can be provided, and water resources are saved.

The invention relates to the technical field of motors, and presents a motor rotor temperature estimation method and device and a controller. The method includes the following steps: establishing a heat generation model to obtain the amount of heat generated; establishing a heat dissipation model to obtain the amount of heat dissipated; establishing a temperature rise model; obtaining the temperature variation at the current time relative to the initial time according to the amount of heat generated, the amount of heat dissipated and the initial temperature variation; and estimating the temperature of the motor according to the temperature variation at the current time relative to the initial time and the initial temperature. The method of estimating the temperature of the motor rotor through the heat generation and heat dissipation models of the motor accords with the law of thermophysics, and the temperature of the motor rotor can be accurately estimated under the condition of accurately calibrating the influence factors of heat generation and heat dissipation of the motor. At the same time, the method does not need a temperature sensor arranged in the motor, the complexity of the system is reduced, the cost is lowered, and the reliability of the system is improved.

The invention discloses a plate type heat exchanging element for evaporation and condensation, belonging to the technical field of engineering thermophysics and energy and utilization. The heat exchanging element is characterized in that a specially designed strengthening heat transfer structure is arranged on the heat transfer zone of the element; a structure protruding to the condensation side plays a role of fixing and turbulence and a structure protruding to the evaporation side is in an inward depression configuration so as to form more corning points; a narrow seam with microscale effect, which is designed aiming at working liquid, is arranged between the structure and a flat bar; the height of the structure is an optimized value which is calculated according to characteristic valuesof detached diameter and capillary length of the working liquid, so as to cause generated bubbles to continuously absorb heat to grow up in the process of sliding between the flat bars after detaching from the coring points, thereby taking more heat away, updating the passed surfaces and accelerating liquid convection. The invention has the effects and benefits that the evaporative condenser consisting of the provided elements is in direct immersion type, and has the advantages of high heat transfer coefficient, convenient unpick and wash, uneasy corrosion and low energy consumption.

The invention discloses an underwater heat source detection and location method based on water body hierarchical filtering, and belongs to the crossing field of marine science, thermal physics and pattern recognition, the method is used for hierarchically filtering the water body, filtering depth is determined through an optimal criterion, and a specific location of the underwater heat source is accurately reflected. The method comprises a step for thermal radiation simulation of an underwater heat source in a water body, a step for actually measuring and acquiring an infrared image of an underwater target, a step for hierarchically filtering the water body and a step for detecting and locating the underwater heat source. According to the invention, a thermal field model of a hierarchical ocean water body is established, a thermal field model of a simplified underwater heat source including an underwater vehicle is further established, and a result of the thermal field model of the underwater heat source in the water body can prove that thermal radiation of the water body is hierarchically distributed; according to the acquired infrared image and the hierarchical theory of the water body thermal radiation, the water body hierarchical filtering method can be used for performing detection and location of the underwater heat source, and precision of detection and location is improved.

The invention belongs to the technical field of multiphase flow in primary subject power engineering and engineering thermophysics, and provides a system for simultaneously carrying out confining pressure and back pressure to realize high pressure in a micro-fluidic chip, the system comprises a liquid container, a plunger pump, a valve, a gas cylinder, a pressure gauge, an intermediate piston container, the micro-fluidic chip, a sapphire confining pressure chamber and a pipeline. According to the system disclosed by the invention, confining pressure and back pressure adjustment can be carriedout on the confining pressure chamber which is simple in process manufacturing only by one plunger pump, one middle piston container and one one-way valve; high pressure is truly achieved through simultaneous internal and external pressurization of the micro-fluidic chip, the system is simple and high in operability, potential safety hazards do not exist, and the cost of the system is greatly reduced while the confining pressure function and the backpressure function are achieved at the same time.

The invention discloses a river channel remote-sensing detection positioning method under boundary heat exchange constraints, and is applied to the crossing field of thermophysics, remote sensing andmode recognition. The method includes obtaining an underwater target boundary heat exchange constraint model by analysis; performing simulation of a boundary heat exchange constraint model of an underwater tunnel in a river, and verifying boundary heat exchange constraint conditions by a simulation result; and taking an infrared image to be recognized for example, performing image preprocessing, roughly determining a suspected underwater target area and performing accurate positioning of an underwater target. The river channel remote-sensing detection positioning method under boundary heat exchange constraints realizes boundary heat exchange constraint simulation modeling in a river environment, and realizes accurate inversion of the underwater target through the boundary heat exchange constraint conditions, thereby realizing detection and positioning of the underwater target.

The invention discloses a hypersonic aircraft leading edge thermal protection design method based on a three-dimensional orthogonal woven composite material, belongs to the technical field of engineering thermophysics, and can effectively reduce the leading edge temperature under the condition of not increasing cooling measures. The method comprises the following steps: firstly, establishing a multivariable linear regression model, and searching theoretical optimization heat conduction configuration of a leading edge, so that the temperature of a leading edge component is effectively reduced; secondly, establishing a general calculation formula suitable for calculating anisotropic heat conductivity coefficients of different woven structures of the three-dimensional orthogonal woven ceramic matrix composite, wherein the general calculation formula is used for guiding a mesoscopic woven structure of the three-dimensional orthogonal woven ceramic matrix composite; finally, an optimization result obtained by the multivariable linear regression model is directly combined with a general formula, mesoscopic woven structures needed by different areas are designed, and collaborative design of leading edge macroscopic temperature optimization and the three-dimensional orthogonal woven ceramic matrix composite mesoscopic woven structure is achieved.

The invention belongs to the technical field of engineering thermophysics/airplane safety, and relates to an observation device for liquid drop collision with a metal bottom plate, and application thereof. The observation device comprises a lifting platform, data acquisition equipment and a data analysis system. According to the invention, an experimental device can realize quantitative measurement of kinetic parameters such as spreading radius, movement slip distance, rebound height and the like of droplets dropping on the surface of a sample table, and can research the surface temperature distribution and phase change time of the droplets based on the droplet light transmission measured by a high-speed camera and the droplet surface temperature measured by a high-speed infrared camera; data analysis adopts an MATLAB program autonomously programmed in a laboratory, so that the convenience and the accuracy of data analysis are ensured; and the whole system has important significance for researching the motion and phase change heat characteristic behaviors, rules and mechanisms of impacting the solid cold surface by the water droplets or impacting the surfaces of different metal materials by the metal droplets.

Mankind has met unprecedented energy and environment protection crises along with immoderate combustion of fossil energy. China is confronted with challenges of greenhouse gas emission reduction and climate change. Electricity generated through wind power is universally acknowledged as clean energy; however, the wind power generation has the defects of being low in generating efficiency and restricted from natural wind and the like. A power-driven wind power generation device provides new renewable energy sources, the core technical scheme relays on ancient mechanics rather than modern thermophysics to solve modernday energy and environmental problems, the unbalance principle of the lever and the principle that the lever amplifies force is discovered in the mechanics field, a wheel-type power-driven windmill with multiple triangular blades and the rated speed between 30-40 rpm is designed, artificial mechanical wind force is efficiently converted into mechanical energy of a permanent magnet direct drive wind turbine generator with rated speed lower than 20 rpm through multiple minitype air blowers, mechanical energy is then converted into electric energy of exceeding more than 100 times, wind power generation can be achieved indoors since then, and the history of living at the mercy of the elements is terminated.

The invention provides a compact-type thermoelectric power generation device and belongs to the engineering thermophysics and new energy cross technical field. The device comprises a compact-type thermoelectric power generation module, a thermal fluid heater, a cold fluid cooler, a thermal fluid circulating pump, a cold fluid circulating pump and cold/ thermal fluid pipelines and the like. The compact-type thermoelectric power generation module is formed by a front end cover guide plate, an A-B-C-D series guide plate combination and a back end cover guide plate, which are stacked up in sequence. The compact-type thermoelectric power generation module has cold fluid and thermal fluid circulation channels, wherein a cold fluid inlet channel and a cold fluid outlet channel form a cold fluid circulation system with the cold fluid pipeline, the cold fluid circulating pump and the cold fluid cooler, and a thermal fluid inlet channel and a thermal fluid outlet channel form a thermal fluid circulation system with the thermal fluid pipeline, the thermal fluid circulating pump and the thermal fluid heater. A plurality of thermoelectric devices are arranged between cold fluid and thermal fluid guide plates in the compact-type thermoelectric power generation module, and the thermoelectric devices convert the heat into electric energy and output the electric energy.

The invention discloses a seabed tunnel remote sensing detection and positioning method under the constraint of background heat radiation, and belongs to the field of intersection of marine science, thermophysics, remote sensing and pattern recognition. The seabed tunnel remote sensing detection and positioning method comprises the steps of obtaining a region of interest according to the geographic position information of an original image, filtering the image background in the region of interest based on the background thermal radiation constraint to obtain an image to be detected; dividing the image to be detected into a plurality of strip-shaped regions, and calculating the gray-scale mean value of all the strip-shaped regions, wherein the long strip-shaped region with the largest gray-scale mean value is the seabed tunnel in the image to be detected. According to the method, the relative low-frequency background is filtered through the background thermal radiation constraint condition, and the frequency band where the target is located is highlighted, so that the detection and positioning of a seabed tunnel are realized.

The invention discloses a molten-state high-temperature matter physical sensible heat recovery system and belongs to the field of engineering thermophysics. Waste heat recovery and recycling of high-temperature metallurgy waste residues generated by iron and steel plants and nonferrous metallurgy plants are achieved. A revolving cup is used for pelleting, slag particles enter a mist space after being tossed away from the revolving cup, and the cooling speed one order of magnitude higher than that of flight in air is obtained. The cooled slag particles enter a powder heat exchanger under actionof gravity, cooling water in the powder heat exchanger absorbs heat and is converted into hot water with pressure, the hot water with pressure enters a flash vessel to be converted into medium-pressure (low-pressure) steam, and the steam drives a steam turbine and a power generator to generate power. The cooled slag particles obtain glass phases by 95% or above, the waste heat recovery rate is close to 83%, while the rest is unrecoverable phase change heat. Steel slag cement quality is ensured while heat is recovered.

The invention discloses a novel cascade phase change heat storage and steam generation system, and belongs to the field of engineering thermophysics. By means of the novel cascade phase change heat storage and steam generation system, heat is stored and released through phase changes of a phase change material (PCM), steam and water separation and steam purification are conducted through a steam pocket, the flow direction of heat conduction fluid (HTF) is controlled through a valve and a one-way valve, the temperature and pressure in a system are detected through a pressure meter and a thermometer, a sensible heat energy storage unit and a latent heat energy storage unit are combined, and the latent heat storage unit is formed by connecting a plurality of heat storage subsystems in series, so that the variety and mass of the phase change material are increased, the heat storage capacity of the phase change material is further utilized, the stability of the system is improved, and supply of steam at different outlet temperatures and heat energy storage of surplus steam can be achieved.

The invention discloses a thermal expansion coefficient measuring device based on engineering thermophysics. The thermal expansion coefficient measuring device comprises a support base, wherein a measuring shell is mounted at the top of the support base; a front transparent glass layer and a rear transparent glass layer are respectively arranged at the front end and the rear end of the measuring shell; a uniform heating mechanism is arranged inside the measuring shell; the uniform heating mechanism comprises heat conduction blocks which are arranged inside the measuring shell and are uniformlydistributed; holding cavities are formed inside the heat conduction blocks; electric heating plates are arranged inside the holding cavities; thermal expansion coefficient measuring mechanisms are arranged inside adjacent heat conduction blocks; a gantry is arranged outside the measuring shell; an adjusting photographing mechanism is arranged on the gantry. By adopting the thermal expansion coefficient measuring device, measurement of an object to be measured can be prevented from being affected by a measuring structure, meanwhile, temperatures inside the device can be uniformly distributed,the precision of measurement results can be ensured, in addition, thermal expansion coefficients of multiple objects can be simultaneously measured, multiple times of measurement can be carried out toobtain an average value, and thermal expansion coefficients of multiple objects can be simultaneously measured.

The invention relates to the field of engineering thermophysics, in particular to a simulation space environment test platform of a thermophotovoltaic isotope power source model machine, which comprises a vacuum system, a water-cooling heat dissipation system, an electric power input system, a wafer output system and a temperature monitoring system, the vacuum system is provided with a cavity, and the cavity is used for installing a to-be-tested system; the vacuum system can vacuumize the cavity, so that a 0.03 m<3> vacuum environment is formed in the cavity; the water-cooling heat dissipation system is communicated with the vacuum system, and constant low temperature in the cavity can be ensured; the electric power input system is arranged on the side surface of the to-be-tested system; and the temperature monitoring system is in communication paste with the to-be-tested system and is used for detecting the temperature of the to-be-tested system. According to the invention, a stable 3*10<-3> Pa to 10<-5 > Pa high-vacuum environment of a 0.03 m<3> cavity can be maintained, various performance tests of existing and future isotope thermophotovoltaic isotope power supply systems are met, and various performance changes are measured in real time.

The invention belongs to the technical field of engineering thermophysics, and particularly discloses a high-heat-flux high-temperature-resistant simulated heat source and application thereof.The high-heat-flux high-temperature-resistant simulated heat source comprises a heat conductor, a heat insulation inner layer, a heat insulation outer layer and a heating body, a groove is machined in the lower surface of the heat conductor, and the heating body is installed in the groove; a thermocouple mounting hole is formed in the upper part of the heat conductor; the heat insulation inner layer is tightly attached to the outer side of the heat conductor and is fixed by a fixing belt from the outer side in a surrounding mode. The heat insulation outer layer tightly wraps the heat insulation inner layer and the heat conductor in a curing forming mode. By tightly combining the working condition characteristics and heat dissipation requirements of the high-heat-flux electronic device, the simulation heat source which is small in size, high in heat flux, high in reliability and easy to operate and maintain is provided for various different electronic device heat dissipation test scenes.