CN112362196A - Construction method for heat flow static calibration - Google Patents
Construction method for heat flow static calibration Download PDFInfo
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- CN112362196A CN112362196A CN202011407739.6A CN202011407739A CN112362196A CN 112362196 A CN112362196 A CN 112362196A CN 202011407739 A CN202011407739 A CN 202011407739A CN 112362196 A CN112362196 A CN 112362196A
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Abstract
The invention discloses a construction method of heat flow static calibration, which comprises the steps of constructing a high-temperature area and a low-temperature area in a vacuum system, forming a length-controllable heat flow state bridge between the high-temperature area and the low-temperature area, and carrying out static long-time heat flow loading on the heat flow state bridge; obtaining a plurality of groups of heat flow densities qw by controlling temperature gradient parameters of a high-temperature area and a low-temperature area of the heat flow state bridge and length parameters of the heat flow state bridge, obtaining a tracing temperature delta Te according to the output voltage of the heat flow state bridge, and obtaining a tracing heat flow density qwe according to the tracing temperature delta Te; and constructing a calibration parameter epsilon of the heat flow sensor according to the multiple groups of heat flow densities qw and the corresponding tracing heat flow densities qwe, wherein the calibration parameter epsilon is | qw-qwe |/qw multiplied by 100%.
Description
Technical Field
The invention relates to the technical field of sensor calibration, in particular to a construction method for heat flow static calibration.
Background
The coaxial thermocouple transient heat flow sensor is an experimental component which utilizes Seebeck effects of different electrode materials to form electromotive force under different temperature gradient effects and measure the electromotive force so as to invert temperature and heat flow, is mainly used for aerospace hypersonic aircraft pneumatic experiments, hypersonic flow related experiments and the like, and has the characteristics of fast response, large measuring range, high precision, strong robustness and the like.
At present, the calibration of the heat flow sensor is generally dynamic calibration, the response of the sensor is inspected by applying a pulse type heat flow load, including a laser loading method, a droplet loading method, a shock tube calibration method and the like, a short-time heat flow loading process is formed, and even though a large amount of calibration data can be obtained in a long-time heat flow loading process, under the long-time dynamic calibration, the dynamic calibration cannot calibrate the load of the applied heat flow, and the heat loss of a zero detection end of a high-temperature region or a main heating region on a heat flow conduction path, specifically including the heat flow area, the heat loss in the radial direction and the measurement repeatability, and the uncertainty of the device, can cause the change of the temperature gradient to be large, the dispersion error to be large, and the measurement of the heat flow can be influenced by the temperature change of.
Disclosure of Invention
The invention aims to provide a construction method for heat flow static calibration, which aims to solve the technical problems that heat flow cannot be traced under short-time dynamic calibration, a discrete error is large and the like in the prior art.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
a construction method for heat flow static calibration comprises the steps of,
s100, constructing a high-temperature area and a low-temperature area in a vacuum system, forming a length-controllable heat flow state bridge between the high-temperature area and the low-temperature area, and carrying out static long-time heat flow loading on the heat flow state bridge;
s200, obtaining a plurality of groups of heat flow densities qw by controlling temperature gradient parameters of a high-temperature area and a low-temperature area of the heat flow state bridge and length parameters of the heat flow state bridge, obtaining a tracing temperature delta Te according to the output voltage of the heat flow state bridge, and obtaining a tracing heat flow density qwe according to the tracing temperature delta Te;
s300, constructing a calibration parameter epsilon (| qw-qwe |)/qw × 100% of the heat flow sensor according to the multiple groups of heat flow densities qw and the corresponding tracing heat flow densities qwe.
As a preferable scheme of the present invention, wherein, in S200, the specific method for performing static long-time heat flow loading on the heat flow state bridge and performing parameter control is as follows:
s201, constructing a heat flux density formula qw of the heat flux state bridge as k delta T/delta y, wherein delta T is the temperature difference between the high-temperature area and the low-temperature area, k is the heat flow meter coefficient, and delta y is the length of the heat flux state bridge;
s202, respectively adjusting temperature gradient parameters of a high-temperature area and a low-temperature area in a mode of controlling a single control variable, wherein the specific range is-150 ℃; and the length parameter of the thermal flow state bridge, the specific range is 3-150 mm;
and S203, calculating qw according to the change of the parameters.
As a preferred embodiment of the present invention, in S200, the thermal flow state bridge between the high temperature region and the low temperature region specifically includes two moving modes, wherein the lengths of the thermal flow state bridge extending into the high temperature region and the low temperature region synchronously realize the change of elongation or shortening, one end of the thermal flow state bridge is fixedly connected to the high temperature region, and the other end of the thermal flow state bridge extends into the low temperature region to realize the decrease or increase of the distance of the convection state bridge between the high temperature region and the low temperature region.
As a preferable mode of the present invention, in the second moving mode of the thermal current state bridge, the thermal current state bridge includes a cylindrical outer tube and an inner tube, the inner tube is sleeved inside the outer tube, a flow guiding gap cavity is formed between the inner tube and the outer tube, the inside of the inner tube is divided into a plurality of flow guiding grooves by a partition plate, and the heat currents conducted by the flow guiding grooves and the flow guiding gap cavity are collected at an end portion of the outer tube located in the low temperature region.
As a preferable aspect of the present invention, in the first moving mode of the state bridge, the convection state bridge includes an outer spring body and an inner spring body, two ends of the outer spring body are fixedly connected to the high temperature region and the low temperature region, a flow guiding gap cavity is formed between the inner spring body and the outer spring body, the middle of the outer spring body is hermetically connected to the inner spring body, and two ends of the outer spring body are respectively provided with a medium inlet pipe and a medium outlet pipe, which are connected to an external constant temperature medium supply source.
As a preferred scheme of the invention, the system further comprises a vacuum steady-state measuring device and a data acquisition device which are matched with the heat flow state bridge, wherein the vacuum steady-state measuring device is used for setting a high-temperature area and a low-temperature area for temperature detection of a target sensor in a vacuum state and generating a convection heat exchange state with uniform temperature gradient between the high-temperature area and the low-temperature area;
the calibration metering device is used for connecting a high-temperature area and a low-temperature area of the vacuum steady-state device and tracing heat flow under a convection heat exchange state;
the data acquisition device is used for acquiring electromotive force data generated in a convective heat transfer state, inverting the uniform temperature gradient and heat flow output data obtained after the source tracing of the calibration metering device through the electromotive force data, and obtaining the linear relation between the heat flow output data and the temperature output data of the target sensor.
As a preferable scheme of the present invention, the vacuum steady-state measuring device includes a target sensor, a vacuum tank for providing a vacuum environment, and a high temperature forming device and a low temperature forming device which are independently disposed in the vacuum tank, the high temperature forming device and the low temperature forming device are connected by a state bridge pipe, the target sensor is mounted on the high temperature forming device and the low temperature forming device, and the data collecting device is connected to an end of the state bridge pipe located in the low temperature forming device and is configured to collect electromotive force data generated by the state bridge pipe in a convection heat exchange state.
As a preferable scheme of the present invention, the state bridge pipe is movably connected to the low temperature forming device in a sealing manner, a displacement device for changing a spatial distance between the high temperature forming device and the low temperature forming device is disposed at an inner bottom portion of the vacuum tank, the state bridge pipe is driven by the displacement device to move linearly into the low temperature forming device, and a distance meter is disposed on the displacement device and used for synchronously measuring a length of the state bridge pipe between the high temperature forming device and the low temperature forming device.
As a preferable scheme of the present invention, the high temperature forming device and the low temperature forming device each include an upper tank fixedly connected to the vacuum tank and a lower tank mounted on the displacement device, the upper tank and the lower tank are connected by a spring joint pipe, the target sensor is disposed on an axis of the upper tank, two ends of the state bridge pipe are respectively connected to the two lower tanks, and one end of the state bridge pipe is movably connected to the lower tank of the low temperature forming device in a sealing manner.
As a preferable scheme of the present invention, a heat insulation plate is disposed between the high temperature forming device and the low temperature forming device, a through hole through which the state strip pipe passes is disposed on the heat insulation plate, and the heat insulation plate is fixedly connected to a middle position of the bidirectional screw.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, through forming static, stable and uniform heat flow of temperature gradient by utilizing the high-temperature area and the low-temperature area in a vacuum environment, and through temperature refinement and long-time measurement of controllable distance, the problems of dynamic calibration of the existing sensor and incapability of tracing the source of the heat flow (an applied heat flow load cannot be calibrated) are avoided, the discrete error in the detection and calibration process is reduced, the influence of temperature change in the calibration process is small, and the static calibration precision of the coaxial thermocouple transient heat flow sensor is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
Fig. 1 is a schematic system structure diagram of a vacuum steady-state measurement apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a longitudinal section of a status bridge according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of the embodiment of the present invention for synchronously extending or shortening the lengths of the bridge in the high temperature region and the low temperature region;
fig. 4 is a schematic diagram of a construction method for providing a heat flow static calibration according to an embodiment of the present invention.
The reference numerals in the drawings denote the following, respectively:
1-vacuum steady state measurement device; 2-calibrating the metering device; 3-a data acquisition device; 4-a high temperature forming device; 5-a low temperature forming device; 6-state bridge tube; 7-a drive mechanism; 8-putting the tank body; 9-lower tank body; 10-spring tube; 11-a tray; 12-a temperature-maintaining tube; 13-a heat insulation plate;
101-a target sensor; 102-a vacuum tank;
601-an outer body; 602-an inner tube; 603-a flow guiding interstitial cavity; 604-a separator; 605-a diversion trench; 606-a spring outer body;
701-a bidirectional screw; 702-fixing the grooved bars.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 4, the present invention provides a construction method of heat flow static calibration, comprising the steps of,
s100, constructing a high-temperature area and a low-temperature area in a vacuum system, forming a length-controllable heat flow state bridge between the high-temperature area and the low-temperature area, and carrying out static long-time heat flow loading on the heat flow state bridge;
s200, obtaining a plurality of groups of heat flow densities qw by controlling temperature gradient parameters of a high-temperature area and a low-temperature area of the heat flow state bridge and length parameters of the heat flow state bridge, obtaining a tracing temperature delta Te according to the output voltage of the heat flow state bridge, and obtaining a tracing heat flow density qwe according to the tracing temperature delta Te;
s300, constructing a calibration parameter epsilon (| qw-qwe |)/qw × 100% of the heat flow sensor according to the multiple groups of heat flow densities qw and the corresponding tracing heat flow densities qwe.
In S200, the specific method for performing static long-time heat flow loading on the heat flow state bridge and performing parameter control includes:
s201, constructing a heat flux density formula qw of the heat flux state bridge as k delta T/delta y, wherein delta T is the temperature difference between the high-temperature area and the low-temperature area, k is the heat flow meter coefficient, and delta y is the length of the heat flux state bridge;
s202, respectively adjusting temperature gradient parameters of a high-temperature area and a low-temperature area in a mode of controlling a single control variable, wherein the specific range is-150 ℃; and the length parameter of the thermal flow state bridge, the specific range is 3-150 mm;
and S203, calculating qw according to the change of the parameters.
The invention controls the heat flow loading range to be 1KW/m by accurately controlling the heat flow conduction of the heat flow state bridge, synchronously tracing the heat flow and providing a larger heat flow tracing temperature gradient range2～15MW/m2Therefore, the measuring range is wide, the heat flow tracing accuracy is high, the formed static heat flow load is formed, and the accuracy in the temperature measuring process and the calibration accuracy are improved.
According to the method, the theoretical heat flux density and the deviation of the heat flux density calculated by tracing the temperature are calculated according to the positive-too distribution of the calibration parameters, so that the sensor is calibrated more effectively and intuitively.
On the precise control of the thermal flow state bridge: the heat flow state bridge between the high temperature area and the low temperature area specifically comprises two moving modes, wherein the length of the heat flow state bridge extending into the high temperature area and the length of the heat flow state bridge extending into the low temperature area synchronously realize the change of extension or shortening, and one end of the heat flow state bridge is fixedly connected with the high temperature area, and the other end of the heat flow state bridge extends into the low temperature area to realize the reduction or the increase of the distance of the convection state bridge between the high temperature area and the low temperature area.
Due to the consideration and acceleration of the calibration time, a composite sample calibration test method is adopted, namely two moving modes of the heat flow state bridge are placed in the same vacuum system.
In a first moving mode of the state bridge, the convection state bridge includes an outer spring body 606 and an inner spring body 602, two ends of the outer spring body 606 are fixedly connected with the high temperature region and the low temperature region, a flow guiding gap 603 is formed between the inner spring body 602 and the outer spring body 606, the middle of the outer spring body 606 is hermetically connected with the inner spring body 602, two ends of the outer spring body 606 are respectively provided with a medium inlet pipe and a medium outlet valve which are connected with an external constant temperature medium supply source, wherein a medium provided in the constant temperature medium supply source is constant temperature water or constant temperature oil.
In the radial heat loss control of the heat flow state bridge, a constant temperature medium is introduced into the flow guide gap cavity 603 in a heat flow tracing measurement period of the heat flow state bridge, and temperature rise data of the constant temperature medium in the flow guide gap cavity 603 is measured in the heat flow tracing measurement period and is used as tracing error data, and is used as compensation data of tracing temperature difference in the final calculation process.
As shown in fig. 1, fig. 2 and fig. 3, wherein the vacuum steady-state measuring device 1 is used for setting a high-temperature region and a low-temperature region for temperature detection of a target sensor in a vacuum state and generating a convection heat exchange state with a uniform temperature gradient between the high-temperature region and the low-temperature region;
the calibration metering device 2 is used for connecting a high-temperature area and a low-temperature area of the vacuum steady-state device and tracing heat flow under a convection heat exchange state;
and the data acquisition device 3 is used for acquiring the electromotive force data generated in the convective heat transfer state, inverting the uniform temperature gradient and calibrating the heat flow output data traced by the metering device 2 through the electromotive force data, and obtaining the linear relation between the heat flow output data and the temperature output data of the target sensor.
The invention forms stable pressure stabilization by utilizing the high-temperature area and the low-temperature area in vacuum, thereby reducing the influence of the external environment on the heat convection formed by the high-temperature area and the low-temperature area, limiting the temperature change gradient of the heat convection of the high-temperature area and the low-temperature area by utilizing the vacuum state, and converting the dynamic state of heat flow into relatively stable static heat flow from the means of controlling variables, thereby forming stable temperature gradient.
In this state, the calibration metering device 2 is used for tracing the heat flow output end in real time, so that the problem that in the dynamic calibration in a short time, the variation of the heat flow is large, and the discrete error summarized in the calibration process caused by the large deviation of the data acquired by the data acquisition device is large in the calibration process is solved.
The invention provides a vacuum steady-state measuring device 1, which comprises a target sensor 101 for measuring the temperature of a high-temperature area and a low-temperature area in real time, a vacuum tank 102 for providing a vacuum environment, a high-temperature forming device 4 and a low-temperature forming device 5 which are independently arranged in the vacuum tank 102;
wherein, the high temperature forming device 4 and the low temperature forming device 5 are connected through a state bridge pipe 6, and the state bridge pipe 6 is used for conducting heat convection;
the target sensor 101 is installed on the high temperature forming device 4 and the low temperature forming device 5, and the data acquisition device 3 is connected to the end part of the state bridge pipe 6 in the low temperature forming device 4 and is used for acquiring electromotive force data generated by the state bridge pipe 6 in a convection heat exchange state.
In the existing dynamic calibration and calibration process, most devices for heat flow transmission adopt a heat resistance plate and a thermopile or a cold and heat source which is fixedly connected to form temperature difference, and a heat supply convection sensor performs data acquisition and calibration in a fixed state.
Further, the state bridge pipe 6 is movably connected with the low-temperature forming device 5 in a sealing mode, a displacement device used for changing the space distance between the high-temperature forming device 4 and the low-temperature forming device 5 is arranged at the inner bottom of the vacuum tank body 102, the state bridge pipe 6 moves linearly towards the interior of the low-temperature forming device 5 under the driving of the displacement device, and a distance meter arranged on the displacement device and used for synchronously measuring the length of the state bridge pipe 6 between the high-temperature forming device 4 and the low-temperature forming device 5.
In order to avoid the change of the flow velocity and the flow quantity of heat flow caused by the relative movement state of the high-temperature forming device 4 and the low-temperature forming device 5 when the high-temperature forming device 4 and the low-temperature forming device 5 are displaced, the high-temperature forming device 4 and the low-temperature forming device 5 both comprise an upper tank body 8 fixedly connected with the vacuum tank body 102 and a lower tank body 9 installed on the displacement device, the upper tank body 8 and the lower tank body 9 are connected through a spring joint pipe 10, the internal state of the upper tank body 8 and the internal state of the lower tank body 9 are kept constant by the deformation of the spring joint pipe 10, and in the moving process, the influence of the change of the internal environment caused by the displacement on the heat flow conduction in the state bridge pipe 6 is reduced as much as possible through the synchronous movement change of the high-temperature forming device 4 and the low-temperature;
two ends of the state bridge pipe 6 are respectively connected to the two lower tank bodies 9, and one end of the state bridge pipe 6 is in movable connection with the lower tank body 9 of the low-temperature forming device 5 in a sealing mode.
The displacement device comprises a tray 11 for mounting the lower tank 9 and a driving mechanism 7 for driving the two trays 11 to do opposite or separated linear motion, the driving mechanism 7 comprises a bidirectional screw 701 for connecting the two trays 11 in a threaded manner, the bidirectional screw 701 is mounted on the inner wall of the vacuum tank 102 through a fixed groove rod 702, the upper half part of the bidirectional screw 701 is in threaded connection with the tray 11, and the distance meter is mounted on the fixed groove rod 702.
If the temperature difference between the whole temperature in the low-temperature forming device 5 and the existing temperature difference in the high-temperature forming device 5 is larger, the instantaneous state change of the state bridge pipe 6 in the process of conducting heat flow into the low-temperature forming device 5 can be influenced, therefore, a temperature maintaining pipe 12 which is coaxial with the state bridge pipe 6 is arranged on the inner wall of the lower tank body 9 of the low-temperature forming device 5, the heat flow in the state bridge pipe 6 is limited to enter an instantaneous space in the low-temperature forming device 6 through the temperature maintaining pipe 12, the temperature maintaining pipe 12 can conduct the temperature change in the low-temperature forming device 5, the temperature change in the temperature maintaining pipe 12 is further ensured to be stable, the temperature maintaining pipe 12 radially extends to the axial center position of the lower tank body 9, and the diameter of the temperature maintaining pipe 12 is larger than the diameter of the state bridge pipe 6.
Further, in the second moving mode of the thermal current state bridge, the thermal current state bridge includes a cylindrical outer tube 601 and an inner tube 602, the inner tube 602 is sleeved inside the outer tube 601, a flow guiding gap cavity 603 is formed between the inner tube 602 and the outer tube 601, the inside of the inner tube 602 is divided into a plurality of flow guiding slots 605 by a partition 604, and the heat currents conducted by the plurality of flow guiding slots 605 and the flow guiding gap cavity 603 are collected at the end of the outer tube 601 located in the low temperature region, in order to reduce the radial heat radiation of the heat current in the state bridge tube 6 and improve the uniformity of the temperature change gradient when the heat current is conducted in the state bridge tube 6, as shown in fig. 2, the state bridge tube 6 includes a cylindrical outer tube 601 and an inner tube 602, the inner tube 602 is sleeved inside the outer tube 601, and a flow guiding gap cavity 603 is formed between the inner tube 602 and the outer tube 601, the thickness of the flow guide gap cavity 603 is 0.5-1 mm;
a small amount of heat flow formed in the high-temperature forming device 4 flows into the flow guide gap cavity 603, an isolated heat flow is formed in the flow guide gap cavity 603 by using the small amount of heat flow in the flow guide gap cavity 603, and radial heat radiation of the inner pipe body 602 is isolated, so that the stability of heat flow conduction of the inner pipe body 602 is ensured, and meanwhile, the heat flow flowing into the flow guide gap cavity 603 is used as a fixed error parameter, so that later-stage measurement and error elimination are facilitated.
In order to reduce the mutual influence of the heat radiation in the vacuum environment in the high-temperature region and the low-temperature region, a heat insulation plate 13 is arranged between the high-temperature forming device 4 and the low-temperature forming device 4, a through hole for the state strip pipe 6 to pass through is arranged on the heat insulation plate 13, the through hole can be in contact with the surface of the state strip pipe 6 through a heat insulation material, and the heat insulation plate 13 is fixedly connected to the middle position of the bidirectional screw 701, specifically, the distance measurement without influencing a distance measuring instrument is taken as the standard.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.
Claims (10)
1. A construction method for heat flow static calibration is characterized by comprising the following steps,
s100, constructing a high-temperature area and a low-temperature area in a vacuum system, forming a length-controllable heat flow state bridge between the high-temperature area and the low-temperature area, and carrying out static long-time heat flow loading on the heat flow state bridge;
s200, obtaining a plurality of groups of heat flow densities qw by controlling temperature gradient parameters of a high-temperature area and a low-temperature area of the heat flow state bridge and length parameters of the heat flow state bridge, obtaining a tracing temperature delta Te according to the output voltage of the heat flow state bridge, and obtaining a tracing heat flow density qwe according to the tracing temperature delta Te;
s300, constructing a calibration parameter epsilon of the heat flow sensor according to the multiple groups of heat flow densities qw and the corresponding tracing heat flow densities qwe, wherein the calibration parameter epsilon is | qw-qwe |/qw multiplied by 100%.
2. The construction method of heat flow static calibration according to claim 1, wherein in S200, the heat flow state bridge is subjected to static long-time heat flow loading, and the specific method for performing parameter control is as follows:
s201, constructing a heat flux density formula qw of the heat flux state bridge as k delta T/delta y, wherein delta T is the temperature difference between the high-temperature area and the low-temperature area, k is the heat flow meter coefficient, and delta y is the length of the heat flux state bridge;
s202, respectively adjusting temperature gradient parameters of a high-temperature area and a low-temperature area in a mode of controlling a single control variable, wherein the specific range is-150 ℃; and the length parameter of the thermal flow state bridge, the specific range is 3-150 mm;
and S203, calculating qw according to the change of the parameters.
3. The method of claim 2, wherein in step S200, the thermal flow state bridge between the high temperature region and the low temperature region includes two moving modes, wherein the lengths of the thermal flow state bridge extending into the high temperature region and the low temperature region are synchronously changed by extension or contraction, and one end of the thermal flow state bridge is fixedly connected to the high temperature region and the other end of the thermal flow state bridge extends into the low temperature region to reduce or increase the distance of the thermal flow state bridge between the high temperature region and the low temperature region.
4. A method as claimed in claim 3, wherein in the second movement of the thermal current state bridge, the thermal current state bridge comprises a cylindrical outer tube (601) and an inner tube (602), the inner tube (602) is sleeved inside the outer tube (601), and a flow guiding gap cavity (603) is formed between the inner tube (602) and the outer tube (601), the inside of the inner tube (602) is divided into a plurality of flow guiding grooves (605) by a partition plate (604), and the heat flows conducted by the flow guiding grooves (605) and the flow guiding gap cavity (603) are collected at the end of the outer tube (601) in the low temperature region.
5. The method of claim 3, wherein in the first movement mode of the state bridge, the convective state bridge comprises an outer spring body (606) and an inner spring body (602), both ends of the outer spring body (606) are fixedly connected to the high temperature region and the low temperature region, a fluid guiding gap cavity (603) is formed between the inner spring body (602) and the outer spring body (606), the middle of the outer spring body (606) is hermetically connected to the inner spring body (602), and both ends of the outer spring body (606) are respectively provided with a medium inlet pipe and a medium outlet pipe connected to an external constant temperature medium supply.
6. The construction method of the heat flow static calibration according to the claims 1 to 5, further comprising a vacuum steady state measuring device and a data collecting device which are matched with the heat flow state bridge, wherein the vacuum steady state measuring device (1) is used for setting a high temperature area and a low temperature area for temperature detection of a target sensor under a vacuum state, and generating a convection heat exchange state with uniform temperature gradient between the high temperature area and the low temperature area;
the calibration metering device (2) is used for connecting a high-temperature area and a low-temperature area of the vacuum steady-state device and tracing heat flow under a convection heat exchange state;
the data acquisition device (3) is used for acquiring electromotive force data generated in a convective heat transfer state, inverting the uniform temperature gradient and heat flow output data traced by the calibration metering device (2) through the electromotive force data, and obtaining a linear relation between the heat flow output data and the temperature output data of the target sensor.
7. The construction method of the heat flow static calibration according to claim 6, characterized in that the vacuum steady state measuring device (1) comprises a target sensor (101), a vacuum tank (102) for providing a vacuum environment, a high temperature forming device (4) and a low temperature forming device (5) which are independently arranged in the vacuum tank (102), the high temperature forming device (4) and the low temperature forming device (5) are connected through a state bridge pipe (6), the target sensor (101) is installed on the high temperature forming device (4) and the low temperature forming device (5), and the data acquisition device (3) is connected to the end of the state bridge pipe (6) located in the low temperature forming device (4) and is used for acquiring electromotive force data generated by the state bridge pipe (6) in a convection heat exchange state.
8. A construction method for static calibration of heat flow according to claim 7, characterized in that the status bridge pipe (6) is in sealed movable connection with the low temperature forming device (5), the inner bottom of the vacuum tank (102) is provided with a displacement device for changing the space distance between the high temperature forming device (4) and the low temperature forming device (5), the status bridge pipe (6) is driven by the displacement device to move linearly into the low temperature forming device (5), and a distance meter is arranged on the displacement device for synchronously measuring the length of the status bridge pipe (6) between the high temperature forming device (4) and the low temperature forming device (5).
9. The construction method for the static calibration of the heat flow is characterized in that the high-temperature forming device (4) and the low-temperature forming device (5) respectively comprise an upper tank body (8) fixedly connected with the vacuum tank body (102) and a lower tank body (9) installed on the displacement device, the upper tank body (8) and the lower tank body (9) are connected through a spring joint pipe (10), the target sensor (101) is arranged on the axis of the upper tank body (8), two ends of the state bridge pipe (6) are respectively connected onto the two lower tank bodies (9), and one end of the state bridge pipe (6) is in sealing movable connection with the lower tank body (9) of the low-temperature forming device (5).
10. The construction method for the static calibration of the heat flow according to the claim 7 is characterized in that a heat insulation plate (13) is arranged between the high temperature forming device (4) and the low temperature forming device (4), a through hole for the state strip pipe (6) to pass through is arranged on the heat insulation plate (13), and the heat insulation plate (13) is fixedly connected to the middle position of the bidirectional screw rod (701).
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| CN111829694A (en) * | 2019-04-23 | 2020-10-27 | 北京振兴计量测试研究所 | Heat flow sensing element for heat flow sensor and heat flow sensor with same |
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| CN102288641A (en) * | 2011-08-18 | 2011-12-21 | 中国飞机强度研究所 | Method for measuring high temperature thermal conductivity coefficient |
| CN103575427A (en) * | 2013-09-24 | 2014-02-12 | 中国科学院力学研究所 | Method for calibrating heat flow meter by adopting heat conduction |
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| JP2019215229A (en) * | 2018-06-12 | 2019-12-19 | 株式会社デンソー | Calibration device of heat flow sensor |
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| CN111829694A (en) * | 2019-04-23 | 2020-10-27 | 北京振兴计量测试研究所 | Heat flow sensing element for heat flow sensor and heat flow sensor with same |
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| CN111795762A (en) * | 2020-07-22 | 2020-10-20 | 南京理工大学 | Device and method for calibrating dynamic characteristics of heat flow meter |
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