CN114487000A - Transient short hot wire method-based sub-supercritical fluid thermal conductivity testing device - Google Patents
Transient short hot wire method-based sub-supercritical fluid thermal conductivity testing device Download PDFInfo
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Abstract
The invention discloses a transient short hot wire method-based sub-supercritical fluid thermal conductivity testing device which comprises a first container, a first heater, a short hot wire testing assembly and a computing module, wherein the first container is provided with a first cavity, the first cavity is suitable for containing fluid, the first heater is arranged at the top of the first container to heat the fluid above the first cavity, the short hot wire testing assembly comprises a short hot wire probe and a resistance circuit, the short hot wire probe penetrates through the top of the first container so that the short hot wire probe can contact and detect the fluid above the first cavity, the resistance circuit is suitable for detecting the short hot wire resistance of the short hot wire probe, and the computing module is used for computing the thermal conductivity of the fluid according to the short hot wire resistance and the short hot wire resistance change time and based on the short hot wire method. The transient short hot wire method-based sub-supercritical fluid thermal conductivity testing device has high detection precision on the thermal conductivity of fluid and is suitable for measuring the thermal conductivity of high-temperature fluid.
Description
Technical Field
The invention relates to the technical field of fluid thermal conductivity testing, in particular to a sub-supercritical fluid thermal conductivity testing device based on a transient short hot wire method.
Background
As aircraft mach numbers continue to increase, as the gas temperatures of aircraft engines increase, the aviation kerosene within the engine air-oil radiator or regenerative cooling system typically needs to cross critical points, undergoing a transition from subcritical to supercritical. Due to the particularity of the supercritical state, the thermal properties of kerosene can be changed violently by small temperature change near a critical point, and the flow, heat exchange process and fluid state of the aviation kerosene in a pipeline under the subcritical/supercritical state are greatly different, so that the research on the thermal properties including the thermal conductivity of the aviation kerosene under the subcritical/supercritical state is very important for the design and optimization of an engine cooling system.
In the related art, under the condition of meeting measurement errors, the upper limit of the test temperature of the thermal conductivity test device is only 550K, and the design requirement of a cooling system of the supersonic aircraft engine cannot be met. Therefore, it is urgently required to design a new test apparatus for measuring the thermal conductivity of a fluid represented by aviation kerosene under a high temperature condition.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the invention provides a transient short hot wire method-based sub-supercritical fluid thermal conductivity testing device, which has higher detection precision on the thermal conductivity of the fluid and is suitable for measuring the thermal conductivity of the high-temperature fluid.
The transient short hot wire method-based sub-supercritical fluid thermal conductivity testing device comprises a first container, a second container and a testing device, wherein the first container is provided with a first cavity, and the first cavity is suitable for containing fluid; a first heater disposed at a top of the first container to heat the fluid above within the first cavity; a short-hot-wire test assembly including a short-hot-wire probe that penetrates through a top of the first container so that the short-hot-wire probe contacts and detects the fluid located above within the first cavity, and a resistive circuit adapted to detect a short-hot-wire resistance of the short-hot-wire probe; and the calculation module is used for calculating the thermal conductivity of the fluid according to the short-hot-wire resistance and the short-hot-wire resistance change time and based on a short-hot-wire method.
The transient short hot wire method-based sub-supercritical fluid thermal conductivity testing device has high detection precision on the thermal conductivity of the fluid and is suitable for measuring the thermal conductivity of the high-temperature fluid.
In some embodiments, the transient short hot wire method-based sub-supercritical fluid thermal conductivity testing apparatus further includes a second heater, the first container is a heat conducting member, the second heater is connected to an outer peripheral wall surface of the first container, and the first heater is connected to an outer wall surface of a top portion of the first container.
In some embodiments, the transient short-hot-wire method-based sub-supercritical fluid thermal conductivity testing device further comprises a second container, the heat conducting member and the first and second heaters are arranged in the second container, a second cavity is arranged between the outer peripheries of the first and second heaters and the heat conducting member and the inner wall of the second container, the second cavity is used for containing oxygen-free flame-retardant gas, and the second container is provided with a carbon monoxide alarm penetrating through the wall thickness of the second container to be communicated with the second cavity.
In some embodiments, the transient short hot wire method-based sub-supercritical fluid thermal conductivity testing device further comprises a thermal insulation layer, the thermal insulation layer is sleeved on the peripheries of the first heater, the second heater and the heat conducting piece, and the second cavity is located between the thermal insulation layer and the first container.
In some embodiments, the transient short hot wire method-based sub-supercritical fluid thermal conductivity testing apparatus further comprises a thermocouple extending through a top of the thermally conductive member so that the thermocouple contacts and tests the fluid located above the first cavity.
In some embodiments, the resistance circuit is a four-wire method circuit.
In some embodiments, the first container has a body and a lid, the body having a recess, the body being removably connected to the lid to enclose the recess to form the first cavity, the recess having a first end proximate to the recess slot and a second end distal from the recess slot, the first end having a cross-section smaller than a cross-section of the second end.
In some embodiments, the body has a first surface, the cover has a second surface, the first surface is opposite to the second surface, the first surface and/or the second surface is provided with a sealing groove, a red copper gasket is embedded in the sealing groove, and the red copper gasket is used for sealing when the body is connected with the cover.
In some embodiments, the transient short hot wire method-based sub-supercritical fluid thermal conductivity testing apparatus further includes a pressurizing container, the pressurizing container has a pressure chamber, the pressure chamber is communicated with the bottom of the first cavity through a first pipeline, the pressure chamber is used for containing the fluid with certain pressure, a third valve is opened at the top of the first container, and the third valve is suitable for controlling the first cavity to be communicated with the outside.
In some embodiments, the pressure chamber includes a fluid chamber layer and a gas chamber layer arranged in sequence from bottom to top, the fluid chamber layer is adapted to correspond to the fluid, the gas chamber layer is adapted to correspond to the oxygen-free flame retardant gas, the density of the oxygen-free flame retardant gas is less than that of the fluid, and the pressurizing container is provided with a safety valve communicated with the gas chamber layer.
In some embodiments, a third conduit is connected to the gas chamber layer for communicating the gas chamber layer with a constant pressure oxygen-free flame retardant gas.
In some embodiments, the transient short hot wire method-based sub-supercritical fluid thermal conductivity testing device further includes an atmospheric pressure container, the atmospheric pressure container has an atmospheric pressure cavity, the atmospheric pressure container is communicated with the bottom of the first cavity through a second pipeline, a first valve is arranged on the first pipeline, the first valve is suitable for controlling the first pipeline to be switched on and off, a second valve is arranged on the second pipeline, and the second valve is suitable for controlling the second pipeline to be switched on and off.
Drawings
Fig. 1 is a schematic diagram of a transient short hot wire method-based sub-supercritical fluid thermal conductivity testing apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a transient short hot wire method-based sub-supercritical fluid thermal conductivity testing apparatus according to another embodiment of the present invention.
Fig. 3 is a schematic diagram of a resistor circuit.
Fig. 4 is an exploded view of the first container of fig. 1.
Description of the drawings:
the device 100 for testing the thermal conductivity of the sub-supercritical fluid based on the transient short hot wire method;
a thermal conductivity test container 1;
a first container 11;
a body 111; a groove 1111; a first face 1112;
a cover 112; a sealing groove 1121; a second face 1122;
a heat insulating layer 12;
a second cavity 13;
a second container 141;
a carbon monoxide alarm 142;
a resistance circuit 15;
a direct current power supply 151; a standard resistor 152; short hot wires 153; a first voltmeter 154; a second voltmeter 155;
a thermocouple 16;
a first heater 171;
a second heater 172;
a third valve 181;
a pressure vessel 2;
a third pipeline 21;
a safety valve 22;
a first pipe 23;
a first valve 24;
a gas cavity layer 25;
a normal pressure vessel 3;
a second valve 31;
a second conduit 32;
a fluid 4.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The transient short hot wire method-based sub-supercritical fluid thermal conductivity testing apparatus 100 (hereinafter referred to as the testing apparatus 100) according to an embodiment of the present invention includes a first container 11, a first heater 171, a short hot wire testing component 15, and a calculation module (not shown in the drawings). The first container 11 has a first cavity adapted to contain the fluid 4. A first heater 171 is provided at the top of the first container 11 to heat the fluid above the inside of the first cavity. The short hot wire test assembly 5 comprises a short hot wire probe (not shown in the figures) penetrating the top of the first container 11 so as to contact and detect the fluid 4 located above the first cavity, and a resistive circuit 15 adapted to detect the short hot wire resistance of the short hot wire probe. And the calculation module is used for calculating the thermal conductivity of the fluid according to the short-hot-wire resistance and the short-hot-wire resistance change time and based on a short-hot-wire method.
In the embodiment of the present invention, the first heater 171 is disposed at the top of the first container 11, so that the temperature of the fluid 4 above the first container 11 can be higher than the temperature of the fluid 4 below the first container 11, and since the density of the fluid 4 decreases with the increase of the temperature at high temperature, the density of the fluid 4 above the first container 11 after the fluid 4 is heated by the first heater 171 decreases, and the fluid 4 with higher temperature always exists above the fluid 4 far from the first heater 171, so that the convection of the fluid 4 can be effectively reduced, and the accuracy of detecting the thermal conductivity can be improved.
Meanwhile, the short hot wire 153 based on the short hot wire method is short, so that the first container 11 connected with the short hot wire testing assembly can have a small volume, and then the first cavity of the first container 11 has a large ratio of the surface area to the volume, and compared with the large volume, the fluid 4 heated by the first heater 171 in the first container 11 with the small volume can be more uniform, and then the convection of the fluid 4 can be reduced and the detection of the thermal conductivity can be more accurate.
Since the higher the temperature, the more the convection of the fluid 4 becomes apparent, the temperature fluctuation of the fluid 4 is large at the time of detection, and accordingly, it is difficult to detect the thermal conductivity of the fluid 4 at a high temperature. The embodiment of the present invention can reduce the convection of the fluid 4 by heating the top of the first container 11 while using the first container 11 having a smaller volume, and thus, the testing device 100 can detect the thermal conductivity of the fluid 4 at a higher temperature within a detection error range.
When the testing device is used for testing the thermal conductivity, the method comprises the following steps: calibrating the temperature coefficient of resistance of the short hot wire 153; heating the fluid 4 to a preset temperature corresponding to subcritical or supercritical by the first heater 171; the short hot wire 153 resistance is detected through the short hot wire testing assembly, and the resistance value change time of the short hot wire 153 are transmitted to the calculation module; the calculation module calculates the thermal conductivity of the fluid 4 according to the resistance of the short hot wire 153 and the resistance change time of the short hot wire 153 based on the short hot wire method.
In some embodiments, the testing device 100 further includes a second heater 172, the first container 11 is a heat-conductive member, the second heater 172 is connected to an outer peripheral wall surface of the first container 171, and the first heater 171 is connected to an outer wall surface of a top portion of the first container 11. In this way, the first heater 171 and the second heater 172 can simultaneously heat the fluid 4 in the first container 11, which helps to improve the heating efficiency, and at the same time, the first heater 171 and the second heater 172 can heat the fluid 4 through the heat-conducting member, so that the first heater 171 and the second heater 172 do not contact the fluid 4, and when the fluid 4 is a flammable fluid or an electrically conductive fluid, the fluid 4 can be prevented from entering the first heater 171 and the second heater 172, thereby ensuring the safety of the testing device 100.
In the present embodiment, the material of the heat conducting member is not limited, and for example, the heat conducting member may be steel or copper.
In some embodiments, the testing device 100 further includes a second container 141, the heat conducting member and the first and second heaters 171 and 172 are disposed in the second container 141, a second cavity 13 is disposed between the outer peripheries of the first and second heaters 171 and 172 and the inner wall of the second container 141, the second cavity 13 is used for containing the oxygen-free flame retardant gas, and the second container 13 is provided with a carbon monoxide alarm 142 penetrating the wall thickness of the second container 141 to communicate with the second cavity 13. Therefore, when the fluid 4 in the first container 13 is flammable fluid, and the oxygen-free flame retardant gas in the second cavity 141 is not filled in the second cavity and is mixed with a small amount of air, after the flammable fluid leaks into the second cavity 141, the flammable fluid and the air are mixed and then enter the first heater 171 or the second heater 172, carbon monoxide may be generated, and the carbon monoxide alarm 142 communicated with the second cavity 141 can give an alarm to the carbon monoxide to prompt a tester that the first container 11 is leaked, so that the safety of the tester is ensured.
In some embodiments, testing device 100 further comprises an insulating layer 12, wherein insulating layer 12 is disposed around first heater 171, second heater 172 and the heat conducting member, and second cavity 13 is disposed between insulating layer 12 and first container 11. The heat insulating layer 12 can reduce the heat dissipated from the first heater 171 and the second heater 172 to the second chamber 13, so as to improve the heating efficiency of the fluid 4 in the first container 11, and the oxygen-free flame retardant gas in the second chamber 141 cannot cause the phenomenon that the gas in the second chamber 13 is over-pressurized to burst the second container 141 due to over-high temperature.
In some embodiments, the testing device 100 further includes a thermocouple 16, the thermocouple 16 extending through a top portion of the thermally conductive member such that the thermocouple 16 contacts and tests fluid located above the first cavity. Therefore, a detector can check the temperature of the fluid 4 above the first cavity in unit time, and when the temperature change displayed by the thermocouple 16 in unit time is small, the thermal conductivity of the fluid 4 can be detected, so that the detection precision of the thermal conductivity of the fluid 4 can be improved.
In some embodiments, the resistor circuit 15 is a four-wire circuit.
In the four-wire method circuit, as shown in fig. 3, a short hot wire 153, a dc power supply 151 and a standard resistor 152 are connected in series, a first voltmeter 154 is connected in parallel with the standard resistor 152 to detect a voltage across the standard resistor 152, and a second voltmeter 155 is connected in parallel across the short hot wire 153 to detect a voltage across the short hot wire 153. When the circuit is connected with the direct current power supply 151, the current of the circuit can be calculated by testing the voltage at the two ends of the standard resistor 152, then the resistance of the short hot wire 153 can be obtained by testing the voltage at the two ends of the short hot wire 153 and dividing the voltage by the current, and the temperature change of the short hot wire can be obtained by the change of the resistance.
The temperature can be calculated from the following relationship between resistance and temperature:
Rh＝ath+0.8124
wherein R ishRepresents short hot line resistance in units of Ω, thThe average temperature of the short heat rays was expressed in deg.C, and a is the temperature coefficient of resistance of the short heat rays after calibration, and when the short heat rays were platinum wires having a diameter of 50 μm and a length of 1.5cm, the temperature coefficient after calibration was 0.0031.
In some embodiments, the first container 11 has a body 111 and a cover 112, the body 111 is provided with a groove 1111, the body 111 is detachably connected with the cover 112 so as to enclose the groove 1111 to form a first cavity, the groove 1111 has a first end near the notch of the groove 1111 and a second end far away from the notch of the groove 1111, and the first end has a smaller cross section than the second end. Therefore, the cover body 112 corresponds to the notch of the groove 1111, and the cross section of the first end of the groove 1111 is smaller than the cross section of the second end of the groove 1111, so that the acting surface of the cover body and the first cavity is smaller, and when the pressure in the first cavity is increased by simulating a subcritical or supercritical working condition in the first cavity, the stress of the cover body 112 is reduced, and the reliability of connection between the cover body 112 and the body 111 is improved.
In some embodiments, the body 111 has a first surface 1112, the cover 112 has a second surface 1122, the first surface 1112 is opposite to the second surface 1122, a sealing groove 1121 is formed in the first surface 1112 and/or the second surface 1122, and a red copper gasket is embedded in the sealing groove 1121 and used for sealing when the body 111 and the cover 1112 are connected. Thus, the body 111 and the cover 112 can be sealed, and have the characteristic of high temperature resistance.
In some embodiments, the testing device 100 further comprises a pressurizing container 2, the pressurizing container 2 has a pressure chamber, the pressure chamber is communicated with the bottom of the first cavity through a first pipeline 23, the pressure chamber is used for containing a fluid 4 with a certain pressure, a third valve 181 is opened at the top of the first container 11, and the third valve 181 is suitable for controlling the first cavity to be communicated with the outside. Thus, the fluid 4 in the pressure chamber can be injected into the first chamber by opening the third valve 181, and the fluid 4 in the first chamber and the fluid 4 in the pressure chamber can be equalized by closing the third valve 181 after the fluid 4 is filled in the first chamber. Since the fluid 4 is injected from the bottom of the first cavity through the first pipeline 23, compared with the injection from the top of the first container 11, the gas contact area between the fluid 4 and the first cavity is small, so that the gas dissolution into the fluid 4 can be reduced and the detection accuracy of the thermal conductivity of the fluid 4 can be ensured, meanwhile, since the temperature of the fluid 4 at the axial center position of the first cavity is lower than the temperature of the fluid 4 at the peripheral wall and the top of the first cavity when the fluid 4 is heated, when the convection of the fluid 4 in the first cavity is strong, the fluid 4 at the short hot wire 153 generates a large temperature difference during detection and generates a phenomenon that the detection of the thermal conductivity of the fluid 4 is not accurate, and the injection of the fluid 4 from the bottom of the first cavity can reduce the convection of the fluid 4 in the first container 11, further reduce the temperature difference of the fluid 4 at the short hot wire 153 per unit time and improve the detection accuracy of the thermal conductivity of the fluid 4.
It should be noted that, in this embodiment, the type of the pressurized container 2 is not limited, for example, the pressurized container 2 may be an energy accumulator, or may be a liquid storage tank connected with a pump, a check valve, a first overflow valve and a second overflow valve, specifically, the pump and the liquid storage tank are communicated through a fourth pipeline, the fourth pipeline is provided with the check valve, the check valve is used for allowing the fluid 4 to flow from the pump to the liquid storage tank in a single direction, the first overflow valve is connected with the liquid storage tank so as to discharge the fluid out of the liquid storage tank when the pressure of the fluid in the liquid storage tank is greater than the preset pressure of the first overflow valve, the second overflow valve is provided on the first pipeline 23, the second overflow valve is used for discharging the fluid 4 into the first cavity when the pressure of the fluid in the liquid storage tank is greater than the preset pressure of the second overflow valve, and at this time, the preset pressure of the second overflow valve is equal to the preset ambient pressure of the first cavity.
In some embodiments, the pressure chamber comprises a fluid chamber layer 26 and a gas chamber layer 25 arranged in sequence from bottom to top, the fluid chamber layer 26 is adapted to correspond to the fluid 4, the gas chamber layer 25 is adapted to correspond to an oxygen-free flame retardant gas, the density of the oxygen-free flame retardant gas is lower than the density of the fluid 4, and the pressurized container 2 is provided with a safety valve 22 communicating with the gas chamber layer 25. Thus, when the first container 11 simulates a subcritical or supercritical working condition, the temperature of the first container 11 and the fluid 4 in the first container 11 will rise, and then the density of the fluid 4 decreases and the pressure of the fluid 4 in the first container 11 increases, at this time, part of the fluid 4 may enter the pressurized container 2 through the first pipeline 23 and increase the pressure of the gas cavity layer 25, when the pressure exceeds the threshold value of the preset ambient pressure of the first cavity, the safety valve 22 is opened to discharge the oxygen-free flame retardant gas out of the pressure container 2, thereby preventing the first container 11 from being burst due to the excessive pressure, and meanwhile, the discharged gas can be diffused into the air, and the test process is convenient to use.
In some embodiments, a third conduit 21 is connected to the gas chamber layer 25, the third conduit 21 being used to communicate the gas chamber layer 25 with a constant pressure oxygen-free flame retardant gas. Thus, since the gas chamber layer 25 is communicated with the constant pressure oxygen-free flame retardant gas through the third pipe 21, and the fluid chamber layer 26 is communicated with the first chamber through the first pipe 23, the pressure of the fluid 4 in the first chamber can be maintained to be the same as the pressure of the constant pressure oxygen-free flame retardant gas.
In some embodiments, the testing device 100 further includes an atmospheric pressure container 3, the atmospheric pressure container 3 has an atmospheric pressure cavity, the atmospheric pressure container 3 is communicated with the bottom of the first cavity through a second pipeline 32, a first valve 24 is disposed on the first pipeline 23, the first valve 24 is adapted to control the on/off of the first pipeline 23, a second valve 31 is disposed on the second pipeline 32, and the second valve 31 is adapted to control the on/off of the second pipeline 32. Thus, after the test is completed, the first valve 24 can be closed to stop the fluid 4 from entering the first cavity of the first container 11, and then the second valve 31 and the third valve 181 are opened to allow the fluid 4 in the first cavity to enter the atmospheric container 3 and cool. By discharging the fluid 4 in the first container 11, the weight of the testing apparatus 100 can be reduced to facilitate storage, and the discharged fluid 4 can be recycled to improve the resource utilization.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A sub-supercritical fluid thermal conductivity testing device based on a transient short hot wire method is characterized by comprising:
a first container having a first cavity adapted to contain a fluid;
a first heater disposed at a top of the first container to heat the fluid above within the first cavity;
a short-hot-wire test assembly including a short-hot-wire probe that penetrates through a top of the first container so that the short-hot-wire probe contacts and detects the fluid located above within the first cavity, and a resistive circuit adapted to detect a short-hot-wire resistance of the short-hot-wire probe;
and the calculation module is used for calculating the thermal conductivity of the fluid according to the short-hot-wire resistance and the short-hot-wire resistance change time and based on a short-hot-wire method.
2. The transient short hot wire method-based sub-supercritical fluid thermal conductivity testing apparatus according to claim 1, further comprising a second heater, wherein the first container is a heat conductive member, the second heater is connected to an outer peripheral wall surface of the first container, and the first heater is connected to an outer wall surface of a top portion of the first container.
3. The transient short hot wire method-based sub-supercritical fluid thermal conductivity testing device according to claim 2, further comprising a second container, wherein the heat conducting member and the first and second heaters are arranged in the second container, a second cavity is arranged between the outer peripheries of the first, second and heat conducting members and the inner wall of the second container, the second cavity is used for containing oxygen-free flame retardant gas, and the second container is provided with a carbon monoxide alarm penetrating through the wall thickness of the second container to communicate with the second cavity.
4. The transient short hot wire method-based sub-supercritical fluid thermal conductivity testing apparatus of claim 3 further comprising a thermal insulation layer, wherein the thermal insulation layer is sleeved on the outer peripheries of the first heater, the second heater and the heat conducting member, and the second cavity is located between the thermal insulation layer and the first container.
5. The transient short hot wire method-based sub-supercritical fluid thermal conductivity testing apparatus according to claim 1, further comprising a thermocouple extending through the top of the heat conducting member so that the thermocouple contacts and tests the fluid located above the first cavity.
6. The transient short hot wire method-based sub-supercritical fluid thermal conductivity testing apparatus according to claim 1, wherein the resistive circuit is a four wire method circuit.
7. The transient short hot wire method-based sub-supercritical fluid thermal conductivity testing apparatus according to claim 1 wherein the first container has a body and a cover, the body is provided with a groove, the body is detachably connected with the cover so as to close the groove to form the first cavity, the groove has a first end near the groove notch and a second end far away from the groove notch, the first end has a smaller cross section than the second end.
8. The transient short hot wire method-based sub-supercritical fluid thermal conductivity testing device according to any one of claims 1-7, further comprising a pressurizing container, wherein the pressurizing container is provided with a pressure chamber, the pressure chamber is communicated with the bottom of the first cavity through a first pipeline, the pressure chamber is used for containing the fluid with certain pressure, the top of the first container is provided with a third valve, and the third valve is suitable for controlling the first cavity to be communicated with the outside.
9. The transient short hot wire method-based sub-supercritical fluid thermal conductivity testing apparatus according to claim 8, wherein the pressure chamber comprises a fluid chamber layer and a gas chamber layer arranged in sequence from bottom to top, the fluid chamber layer is adapted to correspond to the fluid, the gas chamber layer is adapted to correspond to the oxygen-free flame retardant gas, the density of the oxygen-free flame retardant gas is less than that of the fluid, and the pressurizing container is provided with a safety valve communicated with the gas chamber layer.
10. The transient short hot wire method-based sub-supercritical fluid thermal conductivity testing device according to claim 9, further comprising an atmospheric pressure container, wherein the atmospheric pressure container has an atmospheric pressure cavity, the atmospheric pressure container is communicated with the bottom of the first cavity through a second pipeline, a first valve is arranged on the first pipeline, the first valve is adapted to control the first pipeline to be switched on and off, a second valve is arranged on the second pipeline, and the second valve is adapted to control the second pipeline to be switched on and off.
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| Publication number | Priority date | Publication date | Assignee | Title |
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