40 results about "Surface heat flux" patented technology

A method is disclosed for the estimation of subsurface temperature distributions from a 3-dimensional heat conductivity model for a geological formation. The method may be characterized by the following steps: (a) obtaining measured data corresponding to a geological subsurface formation of interest including seismic survey data, in-well temperature, seafloor or surface heat flux measurements and laboratory-based measurements of core porosity, (b) estimating a relationship between seismic velocity and heat conductivity, wherein seismic velocity is linearly dependent on porosity and heat conductivity is exponentially or linearly dependent on porosity, and (c) calibrating the model to the measured in-well data and laboratory-based measurements of core porosity.

The invention relates to a design method for improving the heat generation and heat dissipation capacity of each encapsulated coil of a reactor, which comprises the following steps of: obtaining initial design parameters of the reactor, calculating a mutual inductance matrix of the reactor, and obtaining current of each encapsulated coil by combining total current flowing through the reactor; obtaining the loss of each turn of coil in the encapsulation by adopting an analytical method, and calculating the total loss of each encapsulated coil of the reactor; building a model of the reactor, taking the calculated total loss of each encapsulated coil as a heat source condition in the model of the reactor, and obtaining a temperature field simulation result of the reactor through flow field-temperature field coupling; according to the temperature field simulation result, extracting temperatures, flow fields and encapsulation wall surface heat flux densities under different paths, and forming heat load distribution coefficients among the innermost encapsulation, the outermost encapsulation and the internal encapsulation in combination with a temperature rise calculation method; and obtaining an optimal design result of the reactor. According to the design method, by means of the flow field-temperature field coupling simulation technology of the electric reactor, the temperature risedistribution of all packages of the electric reactor is basically the same, and the utilization rate of metal conductors is increased.

The invention relates to a testing device for heat conductivity coefficients of concrete in a dry state. The device comprises a heat insulation test box, a test piece lower surface heating device, an upper surface heat flux testing device and a temperature collecting device. The heat conductivity coefficients of the massive concrete material in the dry state are obtained through calculation by measuring the average temperature of three points in a test piece lower surface heating area and an upper surface corresponding area in a stable heat transmission state and heat flux passing through a test piece. According to the device, interlayers are arranged in the bottom and the middle of the heat insulation test box, test piece carrying platforms are arranged on the two sides of the heat insulation test box, and a polymer nanomateiral-aerogel is fully utilized for the heat insulation function; existing concrete heat conductivity coefficient testing equipment is simplified to a great extent, and the heat insulation effects achieved when the different kinds of concrete serve as an enclosure structure can be intuitively observed and compared.

The invention discloses a method for researching high Rayleigh number fusion pool heat transfer characteristics by a moving particle finite volume method. The method comprises the following main stepsthat: 1: carrying out particle modeling by aiming at a specific problem, and setting a particle initial layout; 2: according to the position of each particle, dividing a grid; 3: after a time step length [Delta]t, using the finite volume method to solve an energy equation; 4: through a particle method, processing a viscosity term and a source term in an explicit calculation momentum equation, andestimating the speed and the position of the particle; 5: calculating particle number density, and solving a pressure Poisson equation; 6: calculating the correction value of the speed, and calculating the speed and the position of each particle in a next time level; and 7: outputting a calculation result, and according to a solved specific problem, outputting wall surface heat flux density and the phase state of substances in a fusion pool. The method has the advantages that a free liquid surface is accurately captured by a particle method and a phase change problem is simulated, and calculation accuracy is high. Through the method, the high Rayleigh number fusion pool heat transfer characteristics are researched, and an important basis is provided for researching the safety characteristics of the serious accident of a nuclear power plant reactor.

The invention discloses a thermopile principle based heat flux sensor which is used for measuring surface heat flux. The heat flux sensor is of a cylindrical structure. A cylindrical base is machinedfrom a to-be-measured material. One end face of the cylindrical base is used as a measurement surface. The measurement surface is designed to be conformal to the surface shape of the to-be-measured material. The measurement surface is provided with a plurality of grooves. The grooves are filled with a special material. The filled measurement surface has the same shape with the measurement surfacebefore the grooves are arranged. A sensitive element is attached to the surface of the measurement surface. Cold joints of the sensitive component are attached to the surface of the material with higher thermal conductivity between the cylindrical base material and the special material, and heat joints are attached to the surface of the material with lower thermal conductivity. The two ends of thesensitive element are connected to output lines. The output lines are drawn through line outlet holes on the cylindrical base. According to the invention, thermal interference caused by the heat fluxsensor can be minimized, the accuracy of measurement can be improved, and the sensitivity and response speed of the heat flux sensor are significantly improved.

The invention, which belongs to the technical field of thermal parameter measurement of a hypersonic flight vehicle, provides an identification apparatus for a surface heat flux of a hypersonic flightvehicle and a design method thereof. The apparatus is composed of a thermal-conduction sensitive element, a sensitive element insulating sleeve, a sensing element pressing plate, and a temperature sensor. The thermal-conduction sensitive element has a cylindrical structure. The sensitive element insulating sleeve has a cylindrical structure with a through hole. The thermal-conduction sensitive element is arranged in the through hole of the sensitive element insulating sleeve and is in a clearance fit with the sensitive element insulating sleeve. One side of the sensitive element is flush withthe outer surface of the insulating sleeve to form a measuring end surface and the temperature sensor is installed at the bottom of the other side of the sensitive element. The sensing element pressing plate presses the thermal-conduction sensitive element and is in a clearance fit with the sensitive element insulating sleeve; the sensitive element insulating sleeve, the gap between the sensitiveelement and the sensitive element insulating sleeve, and the sensing element pressing plate prevent the parts, except the measuring end surface, of the thermal-conduction sensitive element from carryout heat exchange with an external environment. Therefore, problems that the traditional heat flux sensor has the poor adaptability to the long-term high heat-flux measurement, the sensor size is large, the sensor is heavy, the installation difficulty is high, and intensive measurement can not be realized easily can be solved.

A CdTe thin film-based wall surface heat flux density measurement method comprises the following steps: firstly, preparing a measurement test piece containing two layers of CdTe thin films with different fluorescence emission wavelengths, and then calibrating the test piece to obtain peak wavelength-temperature calibration curve of the two layers of CdTe thin films respectively; placing the test piece on the wall surface to be measured, obtaining temperature fields of the two layers of CdTe films through high-speed camera shooting, image analysis and inversion calculation, and finally calculating the heat flux density field of the wall surface according to the Fourier heat conduction law. The field measurement of the heat flux density can be realized through the optical method, the measurement precision is high, the resolution is high, and the frequency response is fast.

The invention relates to a control method for low-temperature roller hearth heat treatment furnace steel plate heating, and belongs to the field of roller hearth heat treatment furnace optimized control. The control method comprises the following steps of 1, establishing a heat transfer model of radiation heat exchange and convection heat exchange, calculating the surface heat flux density of a steel plate, and calculating the real-time temperature of the steel plate in a furnace; 2, judging whether the steel plate reaches the heat treatment target temperature or not, if not, repeatedly carrying out the step 1, and entering the next calculation cycle to judge again; if yes, starting heat preservation, calculating the position of the steel plate in the furnace at the moment, and calculatingthe heat preservation time when the steel plate reaches an outlet of the heat treatment furnace; judging whether the heat preservation time of the steel plate reaching the outlet of the heat treatment furnace meets the process requirement of the shortest heat preservation time or not, if not, adjusting the furnace temperature and/or the roller speed, repeatedly carrying out the step 1 and step 2,and entering the next calculation period to judge again; and if yes, maintaining the current furnace temperature and roller speed. According to the heat transfer characteristic in the furnace, convection heat transfer calculation is added, reasonable modeling is carried out, and model control precision is improved.

The invention discloses an airborne integrated air-cooled optical fiber cladding power stripper, which comprises a total reflection parabolic mirror and a laser full-absorption surface layer. The total reflection parabolic mirror is arranged in a fuselage; and the laser full-absorption surface layer and the fuselage skin are integrally formed. According to the invention, the cladding power stripper and the fuselage skin are integrally designed, and the design principle of a parabolic mirror is combined, and stray light is directly scattered to the inner wall of the cavity through a quartz glass tube, so that the surface heat flux density of stray light radiated to the inner wall absorption surface is greatly reduced; the generated waste heat is completely concentrated on the inner surfaceof the skin, then, is transferred to the outer surface and is subjected to real-time heat dissipation by utilizing an airborne environment natural cold source-high-altitude low-temperature high-speedairflow, so that a large amount of waste heat generated by stray light stripped from an optical fiber cladding can be efficiently dissipated in real time to meet the temperature control requirement ofthe cladding power stripper; and the cladding power stripper is simple in structure, the overall weight is greatly reduced, and the lightweight design requirement can be met.

The invention relates to a method and device for measuring and calculating the heat leakage of the intermediate joint of a superconducting cable.Surface heat flux of an outer container is collected from the left side face to the right side face of the outer container in a low-temperature constant-temperature container along the outer circumference of the outer container in the axis direction of the outer container, and surface heat flux of the left side face and the right side face of the outer container is collected; from one end of a flexible heat insulation pipe to the other end of the flexible heat insulation pipe, the surface heat flux of the flexible heat insulation pipe is collected along the outer circumference of the flexible heat insulation pipe in the axis direction of the flexible heat insulation pipe; based on an outer container heat leakage calculation model, the total heat leakage of the intermediate joint of the superconducting cable is obtained; and the heat leakage amount of the heat insulation pipe is obtained based on a heat insulation pipe heat leakage amount calculation model. Measurement and calculation of the heat leakage of the outer container and the heat insulation pipe of the intermediate joint of the superconducting cable are achieved, the total heat leakage of the intermediate joint and the heat leakage of the heat insulation pipe of the superconducting cable are obtained, and data support is provided for manufacturing of the intermediate joint of the superconducting cable and the heat insulation pipe based on heat leakage data.

The invention relates to a real-time online measuring device and method, in particular to a two-dimensional surface heat flux density real-time online measuring device and method. According to the technical scheme provided by the invention, the two-dimensional surface heat flux density real-time online measuring device comprises a base body and a base body temperature sensor capable of monitoringthe temperatures of multiple points of the base body, the base body temperature sensor is electrically connected with a measurement control calculation device through a data acquisition board card, and the measurement control calculation device can synchronously acquire the temperatures of multiple points of the base body monitored by the base body temperature sensor through the data acquisition board card; and the measurement control calculation device calculates and determines the surface multi-point heat flux density of the base body by adopting a two-dimensional filtering method after obtaining the multi-point temperature values of the base body. The online monitoring and measuring problems of the surface heat flux density of thermal conversion equipment such as boilers and internal combustion engines can be solved, and therefore optimization and development of related industrial processes are promoted.

The invention provides a temperature acquisition device and an arc wind tunnel flat plate test piece surface heat flux density measurement method, the device comprises a metal flat plate, a heat insulation frame and thermocouples, the heat insulation frame surrounds the metal flat plate, the two thermocouples are installed at the center of the lower surface of the metal flat plate, and the distances between probes of the two thermocouples and the upper surface of the metal flat plate are different. The temperature acquisition assembly is arranged at a to-be-measured position of an arc wind tunnel nozzle outlet. The temperature acquisition assembly can measure temperature repeatedly for a long time and calculate the heat flux density through temperature data, and in combination with the heat flux density measurement method, the change process of the transient heat flux density can be measured in a short time, and the steady-state heat flux density and the radiation equilibrium temperature can be measured for a long time.

The invention discloses a method for controlling a triangular area crack of a continuous casting plain carbon steel slab, which belongs to the technical field of continuous casting slabs, and comprises the following steps: S1, keeping the wide surface water flow of a crystallizer at 3200L/min, controlling the narrow surface water flow of the crystallizer at 510L/min-600L/min, calculating the narrow side and wide surface heat flux according to a heat flux formula of the crystallizer in combination with the water inlet and outlet temperature difference of the crystallizer, meanwhile, the cooling water flow of the foot roller section of the crystallizer is increased by 10-30 L/min, a database is established, and data with the heat flux density ratio of the narrow side to the wide side being 0.8-1.0 MW/m < 2 > is selected; s2, measuring the surface temperature of an inlet and an outlet of the straightening section of the casting blank, firstly, establishing a database according to the measured temperature and the optimized secondary cooling water specific water flow, and selecting data of the straightening section at the temperature of 910-930 DEG C from the database; secondly, an arc-shaped section nozzle of the casting machine is changed into a backwashing nozzle, so that the temperature return amount is less than 20 DEG C;

The invention discloses a direct-current heating single-channel gas heat exchange experimental device which comprises a gas inlet cylinder, an experimental device main body, a gas outlet cylinder and a direct-current power supply, the air inlet cylinder and the air outlet cylinder are tightly connected to the two ends of the experimental device main body; an experiment pipe, a heat insulation sleeve and two electrodes are arranged in the experiment device main body; two ends of the experiment tube are respectively communicated with the air inlet cylinder and the experiment device main body; the heat insulation sleeve is arranged outside the experiment tube in a sleeving manner; the two electrodes are arranged outside the experiment tube in a sleeving manner, and the two electrodes are both embedded into the heat insulation sleeve; and the two electrodes are electrically connected with the direct-current power supply. According to the invention, high-precision, stable and uniform wall surface heat flux density distribution can be realized, the air tightness is better, and the experiment precision is higher.

The invention relates to a heat flux based laser cleaning quality online detection system and a method. A supporting structure of the system is connected with a laser cleaning detection device through a sliding connecting piece. The method comprises the steps that a heat flux sensor is started to correct the cleaning environment temperature, and a laser cleaning module is started to carry out laser cleaning on a workpiece; and a scanning laser detection module is started, when the heat flux, detected by the heat flux sensor, of the workpiece surface is equal to the heat flux of a workpiece base material, a linear scanning laser detection module determines that the workpiece surface is free of areas where protrusions and pits are located, and cleaning is finished. The air hole defect generated by workpiece cleaning is detected by utilizing different convection heat conduction coefficients between different materials on the workpiece surface and the atmosphere and different convection heat conduction coefficients between different shapes of the workpiece surface and the atmosphere, and the problems that only one of cleaning quality and workpiece flaw detection of the previous laser cleaning detection technology is considered, and cleaning quality and workpiece flaw detection cannot be considered at the same time are solved.

The invention provides a cable cover surface heat flux density and pressure measuring device and a use method thereof, the structure comprises a cambered surface projection probe, a support and a bottom plate, the cambered surface projection probe, the support and the bottom plate are connected in sequence to form a closed housing; the cambered surface of the upper surface of the cambered surface protruding probe is consistent with the cambered surface of an aircraft provided with a cable cover, and the cambered surface protruding probe is provided with a plurality of connecting holes used for being connected with a heat flow sensor or a pressure sensor. The bottom plate is provided with wiring holes, and tail wires of the heat flow sensor and the pressure sensor penetrate through the wiring holes to be connected with external testing equipment. The cable cover surface cold wall heat flux density and pressure measuring device solves the problem of cable cover surface cold wall heat flux density and pressure measurement in a wind tunnel test, and is reasonable in structure, simple to mount and dismount, high in measurement precision, wide in measurement range and reusable.