22 results about "Surface heat flow" patented technology

The invention relates to a method for predicting nutation transmission time-varying meshing thermal stiffness of a double-arc spiral bevel gear, which comprises the following steps of: setting convective heat transfer coefficients of a gear meshing surface, a non-meshing surface and a gear end surface in an interaction module according to boundary conditions, and applying surface heat flow in a load module according to an obtained meshing area, so as to predict the nutation transmission time-varying meshing thermal stiffness of the double-arc spiral bevel gear. A heat transfer DC3D8R grid is selected as a grid type, and according to a boundary formula, a temperature field during meshing of the double-arc spiral bevel gear is finally calculated; in a Model of ABAQUS software structure simulation, a load module applies a predefined temperature field, a temperature field odb file is loaded into the Model, and structure simulation is carried out; according to the method, temperature field distribution and meshing characteristics can be combined, the time-varying meshing thermal stiffness of the nutation transmission double-arc spiral bevel gear can be accurately predicted, a theoretical basis can be provided for transmission performance evaluation and service life prediction of a gear pair, and important engineering value is provided for design and optimization of a high-performance gear transmission system.

The invention relates to a flow-heat coupling adaptive calculation method and device based on a wall temperature correction heat exchange coefficient, and relates to the technical field of flow-heat coupling calculation. The method comprises the steps that a wall surface heat exchange coefficient is modeled as a wall temperature power function; in the initial coupling step, solving is carried out according to a wall temperature power function in combination with solid domain transient heat conduction, and a first wall surface temperature is obtained; recalculating the flow field by taking the first wall surface temperature as a new wall surface boundary condition to obtain a first wall surface heat flow and a first wall surface heat exchange coefficient; carrying out simultaneous solution according to the initial wall surface temperature, the initial wall surface heat exchange coefficient, the first wall surface temperature and the first wall surface heat exchange coefficient to obtain a dynamically updated wall temperature power function; in the first coupling step, wall surface heat flow is calculated in real time based on a dynamically updated wall temperature power function, and a second wall surface temperature and a second wall surface heat exchange coefficient are obtained; and repeating the steps until a preset final calculation moment is reached. The dynamic correction of the heat exchange coefficient can be realized.

This invention relates to the field of aircraft fire resistance testing technology, and discloses a device, system, and method for acquiring the surface heat flux density of a fire-resistant test specimen. The system initialization includes: total heat flux measurement (obtaining the theoretical total heat flux value q0); actual pure radiative heat measurement (setting a glass cover around the heat flux sensor without changing its position, shielding convective heat through the glass cover, and then collecting the theoretical radiative heat flux value q1 measured by the heat flux sensor); and multiplying the pre-measured emissivity of the test specimen surface by the theoretical radiative heat flux value q1 to obtain the actual pure radiative heat flux value q. r Actual heat flux calculation: Actual convective heat value q c The actual heat flux q is obtained by subtracting the theoretical radiative heat flux q1 from the theoretical heat flux q0. a Equal to the actual pure radiative heat flux value q r and actual convective heat value q c The sum of radiative heat and convective heat is achieved through precise measurement of these two heat sources under actual aircraft fire conditions, providing high-fidelity, multi-scenario, and highly consistent thermal flow data for twin experiments.

The invention relates to the technical field of building thermal engineering, solves the problems of inaccurate and incomplete evaluation of the heat storage performance of a building envelope and poor environmental adaptability in the prior art, and provides a method, a device and equipment for evaluating the heat storage efficiency of the building envelope and a storage medium to prepare a target test piece containing a functional material; carrying out a cross-characteristic change temperature interval experiment by utilizing the dynamic thermal and humid climate wind tunnel to obtain nonlinear thermal response data; constructing an enthalpy method discrete numerical model, and performing parameter inversion by taking the minimum root-mean-square error of theoretical surface heat flow and actually measured heat flow as a target to obtain thermophysical parameters and an effective specific heat capacity curve; and constructing a thermal network model based on the inversion parameters, and simulating hourly heat flow of each node of the test piece, so as to calculate a multi-dimensional heat storage efficiency evaluation index of the enclosure structure. According to the method, the high-precision wind tunnel experiment, the nonlinear heat transfer model and the inversion algorithm are coupled, the dynamic heat storage performance of the enclosure structure is accurately quantified, and an accurate and practical solution is provided for evaluating the heat storage efficiency of the functional enclosure structure.

The invention relates to a fluid-solid-heat coupling calculation method and device based on wall surface temperature heat flow correction, and relates to the technical field of fluid-solid coupling calculation. The method comprises the steps of calculating initial wall surface heat flow and initial surface pressure; performing structure transient heat conduction calculation in the initial time interval by taking the initial wall surface heat flow as a heat boundary condition to obtain first structure temperature distribution; calculating structural deformation to obtain a first wall surface heat flow and a first surface pressure; repeating the steps to obtain second structure temperature distribution; in the first time interval, calculating a corrected heat flow through a heat flow interpolation model; judging whether the corrected heat flow exceeds a precision threshold value or not; if not, skipping structural deformation and fluid domain calculation at a second moment, and entering a second coupling step; if yes, calculating structural deformation and a fluid domain at a second moment, and entering a second coupling step; and the preset total simulation time is reached. According to the method, the simulation calculation efficiency can be improved while the calculation precision is ensured.

The invention discloses a method, device and equipment for quantitatively characterizing a formation heat convection effect and a storage medium, and the method comprises the following steps: determining a layered interface of an upper formation and a lower formation according to an obtained ground temperature gradient; determining the actually measured surface heat flow of the upper stratum according to the average ground temperature gradient of the upper stratum and the harmonic heat conductivity of the upper stratum; pure heat conduction surface heat flow is determined according to the average ground temperature gradient of the lower stratum, the blending heat conductivity of the lower stratum and radioactive element heat production of the upper stratum; and determining a heat convection value of the stratum according to the actually measured surface heat flow of the upper stratum and the pure heat conduction surface heat flow. The method aims at solving the problems that in an existing method, complexity of a stratum structure is not considered, and accurate quantitative analysis is lacked, the stratum heat convection effect is quantitatively represented through steady-state temperature data and accurate stratum in-situ thermophysical properties, and the more accurate and comprehensive quantitative analysis effect is achieved.

The invention provides a brushless motor temperature rise prediction and evaluation method, which comprises the steps of identifying a balance point of heating increment and cooling gain, evaluating the failure degree of traditional prediction when the balance point appears in a high rotating speed interval, and determining a heat dissipation dominant area above a rotating speed boundary value; according to the determined heat dissipation dominant area, extracting a temperature rise sample of a similar fin structure from a historical test record, and identifying a temperature rise change form in the temperature rise sample to obtain an optimized temperature rise prediction basis; obtaining the proportion of wind friction heating and pumping heat dissipation, evaluating heat flow distribution on the surface of the rotor, obtaining a comprehensive temperature rise evaluation result, feeding back the result to a test platform, and determining a heat dissipation optimization scheme after iteration; and updating the preset temperature rise prediction framework content through the iterated heat dissipation optimization scheme to obtain the brushless motor temperature rise evaluation framework suitable for the fin structure.

The present application relates to the field of building thermal technology, solves the problem that the existing technology is not accurate, not complete, and poor in environmental adaptability for evaluating the heat storage performance of the envelope structure, and provides an envelope structure heat storage efficiency evaluation method, device, equipment and storage medium, a target test piece containing a functional material is prepared; a cross-characteristic change temperature interval experiment is carried out by using a dynamic thermal and humid climate wind tunnel, nonlinear thermal response data is obtained; a discrete numerical model of enthalpy method is constructed, parameter inversion is carried out with the minimum root mean square error of the theoretical surface heat flow and the measured heat flow as the target, and the thermal physical property parameters and the effective specific heat capacity curve are obtained; a thermal network model is constructed based on the inversion parameters, the hourly heat flow of each node of the test piece is simulated, and the multi-dimensional heat storage efficiency evaluation index of the envelope structure is calculated. The present application couples high-precision wind tunnel experiment, nonlinear heat transfer model and inversion algorithm, accurately quantifies the dynamic heat storage performance of the envelope structure, and provides a precise and practical solution for the heat storage efficiency evaluation of functional envelope structure.

The application discloses a method and system for determining a lower limit value of a salt rock deposition thickness of rehydrocarbon generation of a hydrocarbon source rock, and relates to the technical field of oil exploration.The method comprises the following steps: calculating a top surface temperature T1 of the hydrocarbon source rock before salt rock deposition based on a deposition thickness Z1 of a stratum above the hydrocarbon source rock before the salt rock deposition; calculating a top surface temperature T2 of the hydrocarbon source rock after the salt rock deposition based on the deposition thickness Z1 of the stratum above the hydrocarbon source rock before the salt rock deposition and a salt rock deposition thickness Z2; when T2 >= T1, the hydrocarbon source rock will generate hydrocarbon again based on the top surface temperature T1 of the hydrocarbon source rock before the salt rock deposition and the top surface temperature T2 of the hydrocarbon source rock after the salt rock deposition; and calculating the lower limit value Z3 of the salt rock deposition thickness when T2 = T1 > a hydrocarbon generation threshold temperature.The application can quantitatively characterize the thermal state of the hydrocarbon source rock under the salt rock by clearly studying the salt rock thickness, the thermal physical property parameters of the salt rock and the surface heat flow, and can clearly determine the maturity of the hydrocarbon source rock, thereby providing a basic basis for further studying the evolution of the hydrocarbon source rock under the salt rock and the oil and gas reservoir forming process.

The invention relates to the technical field of steelmaking, in particular to a slab longitudinal crack forecasting method based on wide-surface heat flow difference and deviation angle attenuation rate, which comprises the following steps of: calculating an absolute difference value of heat flow densities of an inner arc and an outer arc of a wide surface of a crystallizer in real time, namely calculating a transverse heat flow difference of the wide surface of the crystallizer; four deviation angle areas are selected as detection points, local heat flow data are collected in real time, and the attenuation percentage, namely the deviation angle heat flow attenuation rate, of the heat flow density in unit time is calculated; meanwhile, when the wide-surface heat flow transverse difference of the crystallizer is larger than 150 kW / m < 2 > and the deviation angle heat flow attenuation rate is larger than 4%, longitudinal crack high-risk early warning is triggered; according to the method, the heat flow difference and deviation angle attenuation rate change of the wide surface of the crystallizer are monitored in real time, dynamic adjustment of technological parameters is combined, the sensitivity to uneven transverse cooling of the blank shell is improved, accurate pre-judgment of longitudinal cracks is achieved, the longitudinal crack risk is recognized in advance, the breakout occurrence rate is reduced, and the continuous casting production stability and the slab quality are improved.

The application discloses a subcooled boiling and boiling critical numerical simulation method, device, medium and equipment, and relates to the technical field of heat transfer. The method comprises the following steps: a mixture model is established, and an inertial acceleration volume force generated in a non-inertial system is added to a momentum conservation equation of the mixture model to obtain a non-inertial system mixture model; a bubble dynamics model is established according to a plurality of acting forces acting on a wall surface bubble and the inertial acceleration volume force, and a plurality of bubble characteristic parameters are obtained according to the bubble dynamics model; a wall surface heat flow distribution model is established, and the bubble characteristic parameters are substituted into the wall surface heat flow distribution model to obtain a wall surface heat flow density model; and the wall surface heat flow density model and the non-inertial system mixture model are coupled to obtain a two-phase boiling heat exchange and boiling critical calculation model, which is used for simulating a boiling heat exchange working condition under a motion condition. The numerical simulation method has the advantages of less calculation resources, wide application range, good convergence, and high prediction accuracy.

The application discloses a kind of bearing dynamic thermal resistance determination methods of virtual and real combination, comprising: experimental part, comprising: power to temperature constant, record bearing inner and outer ring surface temperature, by the power shown by metering socket, calculate bearing static radial thermal resistance according to formula;Simulation part: bearing geometric model is simplified, and the multiphase flow simulation model of bearing lubrication and heat transfer is established;In simulation model, set up multiple reference system for bearing inner and outer ring and ball, set up heat insulation on the two sides of bearing, inner and outer ring surface temperature is fixed value, simulate radial heat transfer;Monitoring inner and outer ring surface heat flow and calculating thermal resistance, adjust the volume ratio of lubricating grease in bearing cavity at very low speed until the thermal resistance value is equal to the experimental value, to calibrate bearing simulation model;Different rotational speed is set to bearing, and the thermal resistance under different rotational speed and lubricating grease distribution can be calculated.According to the technical scheme of the application, the simulation result has good precision, and the thermal resistance value of bearing under different rotational speed conditions can be accurately simulated.

The invention provides a dynamic power module temperature change characteristic analysis method and related equipment, and belongs to the technical field of temperature change characteristic analysis. The method comprises the following steps: receiving dynamic power data; the dynamic power data comprises module power and an efficiency factor; performing energy equivalent processing on the dynamic power data to obtain average heating power; performing steady-state thermal simulation analysis according to the average heating power to obtain parameter information of a preset selected part; the parameter information comprises stable state temperature and surface heat flux density; analyzing and calculating according to the parameter information to obtain an equivalent convective heat transfer coefficient; calculating according to the equivalent convective heat transfer coefficient to obtain a time constant; obtaining a transient temperature response expression based on the time constant and the environment temperature; and performing analysis according to the transient temperature response expression to obtain temperature change characteristic information of the dynamic power module. According to the invention, computing resources can be reduced, simulation time can be saved, and dynamic temperature characteristics of the system under different input conditions can be rapidly obtained.

The invention discloses a lunar surface heat flow inversion method based on a three-layer steady-state heat conduction model, and the method comprises the steps: 1, calculating the total mass heat production rate through the specific heat production rate and mass heat production rate of radioactive elements in the moon; 2, constructing a three-layer steady-state heat conduction model comprising a giant weathered layer, a moon shell and a moon curtain, and setting boundary and heat flow continuity conditions; 3, solving a coefficient of a heat conduction equation of the three-layer steady-state heat conduction model to obtain a temperature profile and a temperature gradient; 4, calculating brittleness strength and plastic strength envelopes by using a temperature profile, and calculating a predicted bending moment by using an envelope integral; 5, calculating a target bending moment by using the effective elastic thickness of the lithosphere; 6, continuously adjusting the thickness of the giant weathered layer, reducing the deviation between the predicted bending moment and the target bending moment, and obtaining a convergent temperature structure; 7, solving a surface temperature gradient from the convergent temperature structure; and 8, calculating the lunar surface heat flow according to the surface temperature gradient. The estimation precision of the lunar surface heat flow is improved.

The invention provides a thermal power pipeline anticorrosion thermal insulation layer implementation quality control method and system, and relates to the technical field of quality control, and the method comprises the steps: setting a pipeline space segment and windowing position calibration, deploying a micro thermal excitation unit and a sensor structure, collecting environment parameters, configuring pulse excitation parameters, and collecting multi-channel thermal response; and calculating a thermal inertia reference spectrum parameter and setting an automatic retest triggering rule. By configuring a multi-channel synchronous acquisition system of a micro-thermal excitation unit, a double-layer temperature probe, a surface heat flow sensor and a program controller, accurate modeling and environment correction of a thermal inertia reference spectrum before construction of an anti-corrosion heat-insulating layer of a thermal power pipeline are realized, and a quantifiable physical reference standard can be established in a construction stage; different from the prior art which can only depend on manual detection and infrared image judgment, the system can collect dynamic change data of the outer surface temperature, the bare tube temperature and the heat flux density in real time, and a thermal response reference model is established based on a time constant and an integral thermal difference.

The invention discloses a ground temperature field construction method based on Bayesian framework multi-source data fusion and integrated Kalman inversion, and relates to the technical field of ground temperature field calculation and geothermal parameter inversion, and the technical scheme is characterized in that the method comprises the following steps: obtaining preprocessed gravity and magnetic data; carrying out the inversion of the preprocessed gravity and magnetic data through the multi-source inversion of a Parker-Oldenburg algorithm and a LithoRef18 model, and carrying out the inversion of the preprocessed gravity and magnetic data; an additive Gaussian error model is established in combination with a heat conduction equation, posteriori distribution is taken as a core target under Bayesian statistics, an EKI algorithm is utilized to iteratively optimize parameters, and inversion parameters are output; and inputting the inversion parameters into a nonlinear heat conduction equation to obtain three-dimensional ground temperature fields with different depths, and reckoning surface heat flow distribution. According to the method, high-precision construction of the regional ground temperature field is achieved, compared with traditional interpolation and formula estimation, system errors are reduced, and the reliability of deep temperature and ground surface heat flow prediction is improved to a certain degree.

The application discloses a method for obtaining surface heat flux of a divertor target plate by using surface characteristic temperature of a tungsten-copper module, and relates to the field of magnetic confinement fusion. The method comprises the following steps: when a magnetic confinement fusion experimental device is running, the surface temperature distribution of the tungsten-copper module of the divertor target plate is measured by using a high-resolution infrared thermal imager; a characteristic temperature distribution database of each tungsten-copper module under different circumferential parallel heat flux values is obtained based on three-dimensional profile measurement and thermal analysis simulation in advance; the circumferential parallel heat flux value consistent with the temperature distribution measurement is obtained by comparison; and the results of the modules at different circumferential positions are self-consistently calibrated to accurately obtain the surface heat flux distribution data of the entire divertor target plate. The surface characteristic temperature distribution of the tungsten-copper module can accurately obtain the surface heat flux value of the divertor target plate, which provides reliable heat flux data for evaluating the service performance and life of the tungsten-copper component of the divertor target plate, and for controlling the physical operation of the device and optimizing the engineering structure.

The present application relates to the heat exchange coefficient based on wall temperature correction flow heat coupling adaptive calculation method and device, relates to flow heat coupling calculation technical field. Method includes: the wall surface heat exchange coefficient is modeled as wall temperature power function;In the initial coupling step, according to wall temperature power function, combined with solid domain transient heat conduction, first wall surface temperature is obtained by solving;With first wall surface temperature as new wall surface boundary condition, the flow field is recalculated, and first wall surface heat flow and first wall surface heat exchange coefficient are obtained;According to initial wall surface temperature, initial wall surface heat exchange coefficient, first wall surface temperature and first wall surface heat exchange coefficient, dynamic updated wall temperature power function is obtained by simultaneous solving;In the first coupling step, the wall surface heat flow is calculated in real time based on the dynamic updated wall temperature power function, and the second wall surface temperature and the second wall surface heat exchange coefficient are obtained;Repeat the steps until the preset final calculation time is reached. The present application can realize the dynamic correction of heat exchange coefficient.

The invention discloses neutron imaging equipment, which relates to the technical field of multi-modal imaging and comprises a neutron imaging instrument, an infrared imaging instrument and a loading component. Through the integrated design of a neutron imaging instrument and an infrared imaging instrument, infrared thermal excitation detection is introduced as a complementary means, the surface of a sample can be subjected to active thermal excitation through a light source assembly, and the infrared imaging instrument can accurately capture the surface heat flow change generated by the active thermal excitation; when pores and cracks exist in a sample or light element materials are not uniformly distributed, the heat conduction characteristic of the sample can be changed, so that unique heat characteristics are formed in an infrared image, and the surface heat information is obtained through cooperative work of the light source assembly and the infrared imaging instrument. And by fusing with the internal structure information obtained by the neutron imaging instrument in the control box, the internal structure and defect of the light element material, which are difficult to distinguish by simply relying on neutron imaging, can be indirectly revealed, and the sensitivity and reliability of detection are remarkably improved.

The application provides a gas-heat structure three-field coupling analysis method, equipment and medium, wherein the method comprises: obtaining relevant parameters of a high-speed hypersonic aircraft to be analyzed, the relevant parameters at least comprising: initial geometric shape of a wing surface of the high-speed hypersonic aircraft to be analyzed, initial aerodynamic force parameters; performing analysis based on the initial geometric shape and the initial aerodynamic force parameters to obtain local airflow parameters; performing aerodynamic heat analysis based on the local airflow parameters and the obtained wall surface temperature to obtain surface heat flow of the wing surface; performing heat conduction analysis based on the surface heat flow of the wing surface to obtain new temperature distribution and temperature change of the structure of the wing surface; obtaining cycle conditions based on the temperature change; and outputting coupling results if the cycle conditions are met. In the method, a coupling analysis method is adopted, the influence of temperature change on material properties and structure is considered, and therefore more accurate results are obtained. Meanwhile, the method sets cycle conditions to control the number of iteration calculations, and therefore the calculation process is more efficient.

The invention relates to a symmetric object surface heat flow calculation method and device, equipment and a medium. The method includes: acquiring a first finite element model and dividing the surface of the first finite element model into a plurality of surface elements; numbering each surface element in the plurality of surface elements; copying the first finite element model to obtain a second finite element model; calculating a visual angle coefficient between the surface elements in the first finite element model according to the serial number of each surface element in the second finite element model by adopting a semi-cube method; constructing a visual angle coefficient matrix according to the visual angle coefficients between the surface elements; according to a gray scale radiation theory, constructing a surface-to-surface radiation linear equation set; and calculating the surface heat flow of the target symmetric object according to the visual angle coefficient matrix and the surface-to-surface radiation linear equation set. According to the technical scheme, the numbers of the surface elements are few. Therefore, the number of the visual angle coefficients between the surface elements calculated by the surface element numbers is small, the dimensionality of the visual angle coefficient matrix constructed based on the visual angle coefficients is small, and the calculation amount of the heat flow on the surface of the target symmetric object is effectively reduced.

The embodiment of the invention provides a heat flow measurement system and method for a low-density wind tunnel, and the system comprises a heat flow sensor, and the back surfaces of welding spots of two thermocouple wires are coated with epoxy resin; the experimental model is used as a tested model; the wind tunnel is used for generating simulated airflow; the sensor acquisition and processing system is used for acquiring sensor data of a heat flow sensor and calculating a first surface heat flow result of a to-be-measured position of the experimental model by adopting a heat flow identification method in a second-order Euler display format considering back temperature correction according to the sensor data; the infrared thermogram measuring and collecting system is used for collecting infrared thermogram data of the experimental model while the sensor collecting and processing system calculates the first surface heat flow result, and measuring a second surface heat flow result of the to-be-measured position of the experimental model through the infrared thermogram data; and the processing module is used for obtaining a final surface heat flow result according to the first surface heat flow result and the second surface heat flow result.