Plasma thermal power measuring device and measurement method thereof

Abstract

The present invention belongs to the field of plasma thermal power measurement, and specifically relates to a plasma thermal power measurement device and a measurement method thereof, comprising a plasma plume flow chamber, a calorimetric chamber, and a calorimetric system; the outer wall of the calorimetric chamber and the inner wall of the plasma plume flow chamber form a calorimetric liquid flow channel, the calorimetric liquid flow channel being provided with a liquid inlet and a liquid outlet, the calorimetric liquid flowing from the liquid inlet into the calorimetric liquid flow channel, exchanging heat with the plasma plume flow chamber, and then flowing out from the liquid outlet; the calorimetric system comprising a liquid inlet temperature measurement sensor disposed on the liquid inlet and a liquid outlet temperature measurement sensor disposed on the liquid outlet, a data collection portion further comprising a calorimetric liquid flow measurement sensor; and a solution portion comprising a plasma thermal power calculation model for solving the plasma thermal power. The present invention achieves accurate, real-time, and efficient measurement of the thermal power of a plasma plume without affecting the circulation of the plasma plume.

Description

Technical Field

[0001] The invention belongs to the field of plasma thermal power measurement, and in particular relates to a plasma thermal power measurement device and a measurement method thereof. Background Art

[0002] Plasma technology is currently widely used in the aerospace industry. Electric thrusters generate thrust by accelerating plasma ejection through various methods. However, there is currently no ideal solution for measuring plasma thermal power. Conventional thermal analyzers for materials like kerosene are primarily based on cone calorimeters. (See patent "2023107541888 - An Integrated Cone Calorimeter" for reference.) These analyzers measure the heat of a sample by burning it. However, measuring the thermal power of a plasma plume requires a measurement system that can collect the plasma plume and convert its thermal power into measurement information. Therefore, conventional thermal analyzers cannot meet the requirements for measuring the thermal power of plasma plumes in electric thrusters. Therefore, a dedicated system for measuring plasma plume thermal power is urgently needed. Furthermore, electric propulsion systems typically require testing in a vacuum chamber environment, so the measurement system must be able to operate properly in high vacuum conditions, placing higher demands on the design of the structure and measurement solution. Currently, there is no equipment or system specifically designed for measuring plasma thermal power, while conventional thermal analyzers are based on cone calorimeters. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a plasma thermal power measuring device and a measuring method thereof, which can accurately, real-timely and efficiently measure the thermal power of a plasma plume without affecting the circulation of the plasma plume.

[0004] The present invention provides a plasma thermal power measuring device, comprising a plasma plume flow chamber, a calorimetric chamber and a calorimetric system;

[0005] The plasma plume flow cavity is made of heat-conducting material;

[0006] The calorimetric chamber is made of a heat-insulating material and is arranged on the outer wall of the plasma plume flow chamber. The outer wall of the calorimetric chamber and the inner wall of the plasma plume flow chamber form a calorimetric liquid flow channel. The calorimetric liquid flow channel is provided with a liquid inlet and a liquid outlet. The calorimetric liquid flows from the liquid inlet into the calorimetric liquid flow channel, exchanges heat with the plasma plume flow chamber, and then flows out from the liquid outlet.

[0007] The calorimetric system includes a data collection part and a solution part. The data collection part includes a liquid inlet temperature measurement sensor arranged on the liquid inlet and a liquid outlet temperature measurement sensor arranged on the liquid outlet. The data collection part also includes a calorimetric liquid flow measurement sensor for measuring the calorimetric liquid flow in the calorimetric liquid flow channel; the solution part includes a plasma thermal power calculation model, and the data collected by the data collection part is input into the plasma thermal power calculation model to obtain the thermal power of the plasma plume collected by the plasma plume flow cavity.

[0008] Furthermore, the plasma thermal power calculation model is:

[0009] ;

[0010] Where, is the plasma thermal power, is the specific heat capacity of the calorimetric fluid, is the density of the calorimetric fluid, is the flow rate of the calorimetric fluid, is the temperature of the calorimetric liquid at the outlet, is the temperature of the calorimetric liquid at the liquid inlet.

[0011] Furthermore, the plasma plume flow cavity includes a collecting section and a measuring section sequentially arranged along the flow direction of the plasma plume;

[0012] The measuring section is a uniform cylindrical tube structure, and the collecting section gradually expands from the end of the cylindrical tube structure to the upstream direction.

[0013] Furthermore, a valve is provided at the outlet end of the plasma plume flow cavity.

[0014] Furthermore, the solution part is implemented by a circuit module, the circuit module has the plasma thermal power calculation model burned into the control chip, and the circuit module also includes a signal access structure connected to the data of the collection part.

[0015] Furthermore, the plasma thermal power measuring device is provided at two locations, namely a thermal power measuring device at the plasma generation location and a thermal power measuring device at the plasma action location;

[0016] The plasma generating location heat power measuring device is arranged on the plasma generating device, and the plasma plume flow cavity of the plasma generating location heat power measuring device is the ionization channel of the plasma generating device;

[0017] The plasma plume flow cavity of the plasma action thermal power measuring device is in communication with the tail jet channel of the plasma generating device;

[0018] The thermal powers of the plasma plume measured by the thermal power measuring device at the plasma generation location and the thermal power measuring device at the plasma generation location are added together to obtain the total thermal power of the plasma plume.

[0019] Furthermore, the coil of the plasma generating device is a hollow coil, a cooling medium flows through the coil, and the coil is located in a calorimetric fluid flow channel in a thermal power measuring device at the plasma generating location;

[0020] The actual thermal power obtained by the thermal power measurement device at the plasma generation location is:

[0021] ;

[0022] Where, is the actual thermal power of the thermal power measuring device at the plasma generation location, is the heat of the calorimetric fluid in the thermal power measuring device at the plasma generation location, is the heat of the outer wall of the coil.

[0023] Furthermore, the heat of the outer wall of the coil is:

[0024] ;

[0025] Where, The heat of the inner wall of the coil, By measuring the temperature change of the cooling water flowing into the coil, is the inner diameter of the coil, is the outer diameter of the coil.

[0026] The present invention also provides a plasma thermal power measurement method, using the above-mentioned plasma thermal power measurement device, comprising the following steps:

[0027] S1, plasma plume flows in the plasma plume flow cavity;

[0028] S2, the heat of the plasma plume is transferred to the calorimetric fluid through the wall of the plasma plume flow cavity;

[0029] S3, the data collection part of the calorimetric system collects the inlet temperature, outlet temperature, flow rate, specific heat capacity and density of the calorimetric liquid, and inputs them into the solution part to collect and solve the thermal power of the plasma plume.

[0030] Furthermore, the plasma thermal power measuring device includes a thermal power measuring device at a plasma generation location and a thermal power measuring device at a plasma action location. The thermal power of the plasma plume at the generation location measured by the thermal power measuring device at the plasma generation location is added to the thermal power of the plasma plume at the action location measured by the thermal power measuring device at the plasma action location to obtain the total thermal power of the plasma plume.

[0031] The beneficial effect of the present invention is that the plasma thermal power measurement device provided by the present invention directly uses the plasma plume flow cavity to collect plasma and conduct thermal power, and finally calculates the thermal power of the plasma plume through the calorimetric system. It can well adapt to the structural requirements of the electric propulsion system plasma plume thermal power measurement, and solves the problem that the traditional cone calorimeter cannot measure the plasma plume, or the problem that the traditional probe type measurement device can only perform local sampling measurement and the inaccuracy caused by the problem that the probe will interfere with the flow of the plasma plume. It achieves the precise, real-time and efficient measurement of the thermal power of the plasma plume without affecting the circulation of the plasma plume. Moreover, the plasma thermal power measurement device can not only work normally in a high vacuum environment, but also control the temperature of the plasma plume flow cavity and its other components, thereby improving the stability of the plasma plume generation and the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Attachment Figure 1 It is a structural schematic diagram of the present invention;

[0033] Attachment Figure 2 It is a front cross-sectional view of the present invention;

[0034] Attachment Figure 3 Schematic diagram of the structure of the circuit module in the present invention;

[0035] Attachment Figure 4 This is a circuit diagram of a circuit module in the present invention including an STM32F103C8T6 control chip;

[0036] Attachment Figure 5 Schematic diagram of a program burning circuit in a circuit module of the present invention;

[0037] Attachment Figure 6 This is a circuit diagram of the USB interface circuit for communication between the control chip and the host computer in the circuit module of the present invention;

[0038] Attachment Figure 7 Schematic diagram of a power filter circuit in a circuit module of the present invention;

[0039] Attachment Figure 8 Schematic diagram of the crystal oscillator circuit in the circuit module of the present invention;

[0040] Attachment Figure 9 This is a circuit diagram of a BOOT pin selection circuit in a circuit module of the present invention;

[0041] Attachment Figure 10 Schematic diagram of a reset circuit in a circuit module of the present invention;

[0042] Attachment Figure 11 This is a circuit diagram of a 5V to 3V voltage stabilizing module circuit in the circuit module of the present invention;

[0043] Attachment Figure 12 This is a circuit diagram of a deionized water inlet temperature sensor calculation circuit in the circuit module of the present invention;

[0044] Attachment Figure 13 This is a circuit diagram of a deionized water outlet temperature sensor calculation circuit in the circuit module of the present invention;

[0045] Attachment Figure 14 This is a circuit diagram of a high-precision flowmeter interface circuit for a deionized water inlet in the circuit module of the present invention;

[0046] Attachment Figure 15 This is a circuit diagram of a high-precision flowmeter interface circuit for a deionized water outlet in a circuit module of the present invention;

[0047] Attachment Figure 16 This is a circuit diagram of a plasma outlet gas flow valve control signal output in a circuit module of the present invention;

[0048] Attachment Figure 17 Schematic diagram of a serial port to USB circuit in a circuit module of the present invention;

[0049] Attachment Figure 18 This is a circuit diagram of the system initialization button in the circuit module of the present invention;

[0050] Attachment Figure 19 This is a circuit diagram of a button for increasing the sampling frequency in a circuit module of the present invention;

[0051] Attachment Figure 20 This is a circuit diagram of a button for reducing the sampling frequency in a circuit module of the present invention.

[0052] In the figure, 1- plasma plume flow chamber; 11- collection section; 12- measurement section; 2- calorimetric chamber; 3- calorimetric system; 31- liquid inlet temperature measurement sensor; 32- liquid outlet temperature measurement sensor; 33- liquid inlet calorimetric liquid flow measurement sensor; 34- liquid outlet calorimetric liquid flow measurement sensor; 4- calorimetric liquid flow channel; 41- liquid inlet; 42- liquid outlet; 5- valve; 6- plasma generating device; 61- ionization channel; 62- cooling channel; 63- coil; 64- tail jet channel; 65- water inlet; 66- water outlet; 7- sealing soft rubber sleeve; 8- circuit module; 81- circuit module includes STM32F103C8T6 control chip; 82- program burning circuit 83-USB interface circuit for communication between control chip and host computer; 84-power filter circuit; 85-crystal oscillator circuit; 86-BOOT pin selection circuit; 87-reset circuit; 88-5V to 3V voltage regulator module circuit; 89-deionized water inlet temperature sensor solution circuit; 810-deionized water outlet temperature sensor solution circuit; 811-deionized water inlet high-precision flow meter interface circuit; 812-deionized water outlet high-precision flow meter interface circuit; 813-plasma outlet gas flow valve control signal output; 814-serial port to USB circuit; 815-system initialization button; 816-increase sampling frequency button; 817-decrease sampling frequency button. DETAILED DESCRIPTION

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0054] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0055] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0056] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection, electrical connection, physical connection, or wireless communication connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0058] As attached Figure 1 -Attached Figure 2 As shown, the present invention provides a plasma thermal power measurement device, comprising a plasma plume flow chamber 1, a calorimetric chamber 2 and a calorimetric system 3;

[0059] The plasma plume flow cavity 1 is made of heat-conducting material;

[0060] The calorimetric chamber 2 is made of thermal insulation material, and the calorimetric chamber 2 is arranged on the outer wall of the plasma plume flow chamber 1. The outer wall of the calorimetric chamber 2 and the inner wall of the plasma plume flow chamber 1 form a calorimetric liquid flow channel 4, wherein the plasma plume flow chamber 1 is made of thermal conductive material, which can transfer the heat of the plasma plume flowing in the plasma plume flow chamber 1 to the calorimetric liquid as much as possible. The calorimetric chamber 2 is made of thermal insulation material, which can prevent the calorimetric liquid from absorbing the heat power of the plasma in the calorimetric chamber from being transferred to the outside world, so that the heat of the plasma plume is transferred to the calorimetric liquid to the greatest extent, thereby improving the measurement accuracy. The calorimetric liquid flow channel 4 is provided with a liquid inlet 41 and a liquid outlet 42. The calorimetric liquid flows into the calorimetric liquid flow channel 4 from the liquid inlet 41, exchanges heat with the plasma plume flow chamber 1, and then flows out from the liquid outlet 42. The calorimetric liquid is mainly used to absorb the thermal power of the plasma, and the thermal power of the plasma plume can be obtained through calculation by the calorimetric system 3. In addition, while absorbing the thermal power of the plasma, the calorimetric liquid can also ensure the temperature of the calorimetric chamber 2, thereby achieving synchronous cooling of the calorimetric chamber 2 and the plasma plume flow chamber 1, improving the service life and stability of the equipment. That is, temperature control is achieved while measuring the thermal power of the plasma.

[0061] The calorimetric system 3 includes a data collection part and a solution part. The data collection part includes a liquid inlet temperature measurement sensor 31 arranged on the liquid inlet 41 and a liquid outlet temperature measurement sensor 32 arranged on the liquid outlet 42. The liquid inlet temperature measurement sensor 31 is used to measure the initial temperature of the calorimetric liquid at the liquid inlet 41 before heat exchange, and the liquid outlet temperature measurement sensor 32 is used to measure the post-heat exchange temperature of the calorimetric liquid at the liquid outlet 42 after heat exchange. The data collection part also includes a calorimetric liquid flow measurement sensor for measuring the flow rate of the calorimetric liquid in the calorimetric liquid flow channel 4. The flow rates at the liquid inlet 41 and the liquid outlet 42 are set to be consistent. The calorimetric liquid flow measurement sensor is preferably arranged on the liquid inlet 41 and / or the liquid outlet 42; the solution part includes a plasma thermal power calculation model, and the data collected by the data collection part is input into the plasma thermal power calculation model to obtain the thermal power of the plasma plume collected by the plasma plume flow cavity 1.

[0062] The plasma thermal power measurement device provided by the present invention directly uses the plasma plume flow chamber 1 for plasma collection and thermal power conduction, and finally calculates the thermal power of the plasma plume through a calorimetric system. It can well adapt to the structural requirements of the electric propulsion system plasma plume thermal power measurement, and solves the problem that the traditional cone calorimeter cannot measure the plasma plume, or the problem that the traditional probe-type measurement device can only perform local sampling and measurement, resulting in inaccuracy, and the problem that the probe will interfere with the flow of the plasma plume. It achieves accurate, real-time, and efficient measurement of the thermal power of the plasma plume without affecting the circulation of the plasma plume. Moreover, this plasma thermal power measurement device can not only work normally in a high vacuum environment, but also control the temperature of the plasma plume flow chamber 1 and its other components, thereby improving the stability of the plasma plume generation and the service life of the equipment.

[0063] The inlet liquid temperature measurement sensor 31 and the outlet liquid temperature measurement sensor 32 are preferably PT100 temperature sensors, and the calorimetric liquid flow measurement sensor is preferably a high-precision liquid water flow meter.

[0064] In one embodiment, the plasma thermal power calculation model is:

[0065] ;

[0066] Where, is the plasma thermal power, is the specific heat capacity of the calorimetric fluid, is the density of the calorimetric fluid, is the flow rate of the calorimetric fluid, is the temperature of the calorimetric liquid at the outlet, is the temperature of the calorimetric liquid at the liquid inlet.

[0067] In the plasma thermal power calculation model, the specific heat capacity and density of the calorimetric liquid are fixed values ​​after the calorimetric liquid is selected; the flow rate of the calorimetric liquid is measured by a calorimetric liquid flow measurement sensor. Preferably, an inlet calorimetric liquid flow measurement sensor 33 is provided at the liquid inlet 41, and an outlet calorimetric liquid flow measurement sensor 34 is provided at the liquid outlet 42. The average value of the inlet calorimetric liquid flow measurement sensor 33 and the outlet calorimetric liquid flow measurement sensor 34 is taken for flow correction to obtain the flow rate of the calorimetric liquid. The temperature of the calorimetric liquid at the liquid outlet is measured by the outlet temperature measurement sensor 32, and the temperature of the calorimetric liquid at the liquid inlet is measured by the inlet temperature measurement sensor 31. The measured data are input into the plasma thermal power calculation model to obtain real-time plasma thermal power. Preferably, the measured plasma thermal power can also be sent to the host computer through the serial port to realize data recording or real-time curve display.

[0068] In one embodiment, the calorimetric liquid is deionized water to avoid being affected by the plasma generating device 6 .

[0069] In one embodiment, the plasma plume flow chamber 1 includes a collecting section 11 and a measuring section 12 sequentially arranged along the flow direction of the plasma plume;

[0070] The measuring section 12 is a uniform cylindrical tube structure, which can ensure the dynamic stability of the plasma amount in the measuring section 12 and can fully contact and transfer heat with the inner wall surface, thereby improving measurement accuracy. The collecting section 11 gradually expands from the end of the cylindrical tube structure toward the upstream direction, which can not only receive the incoming plasma plume but also extend the residence time of the plasma plume. The plasma plume flow chamber 1 of this embodiment is particularly suitable for a device for measuring thermal power at the plasma action site.

[0071] In one embodiment, a valve 5 is provided at the outlet of the plasma plume flow chamber 1 to control the gas flow rate within the plasma plume flow chamber 1. Valve 5 controls the outlet flow rate to be equal to the inlet flow rate, ensuring that the plasma thermal power measured is for plasma plumes of equal volume. Valve 5 is preferably a valve with a controllable opening and closing degree, thereby adjusting the outlet flow rate based on the inlet flow rate.

[0072] In one embodiment, the solution part is implemented by a circuit module 8, the circuit module 8 has the plasma thermal power calculation model burned into a control chip, and the circuit module 8 also includes a signal access structure connected to the data of the collection part.

[0073] Reference Attachment Figure 3 -Attached Figure 20In a specific exemplary embodiment, the circuit module includes an STM32F103C8T6 control chip 81, a program burning circuit 82, a USB interface circuit 83 for communication between the control chip and the host computer, a power filter circuit 84, a crystal oscillator circuit 85, a BOOT pin selection circuit 86, a reset circuit 87, and a 5V to 3V voltage regulator module circuit 88. , deionized water inlet temperature sensor solution circuit 89, deionized water outlet temperature sensor solution circuit 810, deionized water inlet high-precision flowmeter interface circuit 811, deionized water outlet high-precision flowmeter interface circuit 812, plasma outlet gas flow valve control signal output 813, serial port to USB circuit 814, system initialization button 815, increase sampling frequency button 816, decrease sampling frequency button 817; wherein the program burning circuit 82 is used to burn the plasma thermal power calculation model; the control chip and host computer communication USB interface circuit 83 is used to enable the circuit module to communicate with the host computer; the deionized water inlet temperature sensor solution circuit 89, deionized water outlet temperature sensor solution circuit 810, deionized water inlet high-precision flowmeter interface circuit 811 and deionized water outlet high-precision flowmeter interface circuit 812 are used to obtain data from the collection part; the plasma outlet gas flow valve control signal output 813 is used to control valve 5; the system initialization button 815, increase sampling frequency button 816 and decrease sampling frequency button 817 are used to control the operation of the circuit module.

[0074] In one embodiment, the plasma thermal power measuring device is provided at two locations, namely a thermal power measuring device at the plasma generation location and a thermal power measuring device at the plasma action location;

[0075] The plasma generating location thermal power measurement device is disposed on the plasma generating device 6, wherein the plasma generating device 6 may be described with reference to Chinese patent application "CN117615496A - An Inductively Coupled Plasma Generation and Observation Device and Observation Method." The plasma generating location thermal power measurement device is used to measure the thermal power of the plasma plume at the plasma generating location. In this case, it is only necessary to install a liquid inlet temperature measurement sensor 31 on the water inlet 65 of the plasma generating device 6, a liquid outlet temperature measurement sensor 32 on the water outlet 66, and a calorimetric liquid flow measurement sensor for monitoring the flow in the cooling channel 62. In this way, the thermal power of the plasma plume in the ionization channel 61 can be measured in real time to obtain the portion of plasma energy lost through the ionization channel 61, thereby measuring the overall thermal power of the plasma plume from generation to circulation, thereby greatly improving measurement accuracy. Specifically, in the plasma generating thermal power measuring device, the plasma plume flow chamber 1 of the plasma generating thermal power measuring device is the ionization channel 61 of the plasma generating device 6, the calorimetric chamber 2 is the shell of the cooling channel 62 of the plasma generating device 6, the calorimetric liquid flow channel 4 is the cooling channel 62 of the plasma generating device 6, the liquid inlet 41 is the water inlet 65 of the plasma generating device 6, and the liquid outlet 42 is the water inlet 65 of the plasma generating device 6;

[0076] The plasma plume flow chamber 1 of the thermal power measuring device at the plasma action site is connected to the tail jet channel 64 of the plasma generating device 6. At this time, the plasma plume flow chamber 1 is a structure with a hollow interior and open at both ends, wherein one end is open for connecting to the tail jet channel 64 of the plasma generating device 6, for receiving the plasma plume ejected from the tail jet channel 64, and the other end is provided with the valve 5. Preferably, a sealing soft rubber sleeve 7 is provided at the connection between the tail jet channel 64 and the plasma plume flow chamber 1 to ensure that the plasma plume ejected from the tail jet channel 64 is completely collected by the plasma plume flow chamber 1. Preferably, the channel wall thickness of the calorimetric liquid flow channel 4 is 2 mm, so that the deionized water flowing in the calorimetric liquid flow channel 4 forms a water film, thereby improving the heat absorption efficiency of the deionized water;

[0077] The plasma thermal power calculation method of the plasma generation thermal power measuring device and the plasma generation thermal power measuring device is consistent, and the total thermal power of the plasma plume is obtained by adding the thermal powers of the plasma plume measured by the plasma generation thermal power measuring device and the plasma generation thermal power measuring device.

[0078] In this embodiment, the entire plasma generation and flow can be measured, further improving the accuracy of the measurement.

[0079] In one embodiment, considering that the coil 63 for generating plasma is disposed in the cooling channel 62 and the coil 63 generates heat, which affects the measurement accuracy of the thermal power measuring device at the plasma generation location, it is necessary to eliminate the heat generation effect of the coil 63. Specifically, the coil 63 of the plasma generating device 6 is a hollow coil, and a cooling medium flows through the coil 63. The coil 63 has a consistent pipe diameter and consistent water pressure, so the flow rate per unit time is consistent and the heat absorption efficiency is consistent. In addition, the coil 63 is located in the calorimetric liquid flow channel 4 of the thermal power measuring device at the plasma generation location.

[0080] The actual thermal power obtained by the thermal power measurement device at the plasma generation location is:

[0081] ;

[0082] Where, is the actual thermal power of the thermal power measuring device at the plasma generation location, is the heat of the calorimetric fluid in the thermal power measuring device at the plasma generation location, is the heat of the outer wall of the coil.

[0083] Specifically, the ratio of the inner and outer wall areas of the coil 63 is:

[0084] ;

[0085] The amount of heat transferred is proportional to the area, so:

[0086] The heat of the outer wall of the coil 63 is:

[0087] ;

[0088] Where, The heat of the inner wall of the coil 63, By measuring the temperature change of the cooling water flowing into the coil 63, is the inner diameter of the coil 63, is the outer diameter of the coil 63 .

[0089] The inner diameter of the coil 63 and the outer diameter of the coil 63 are known quantities.

[0090] The present invention also provides a plasma thermal power measurement method, using the above-mentioned plasma thermal power measurement device, comprising the following steps:

[0091] S1, plasma plume flows in plasma plume flow cavity 1;

[0092] S2, the heat of the plasma plume is transferred to the calorimetric fluid through the wall of the plasma plume flow chamber 1;

[0093] S3, the data collection part of the calorimetric system 3 collects the inlet temperature, outlet temperature, flow rate, specific heat capacity and density of the calorimetric liquid, and inputs them into the solution part to collect and solve the thermal power of the plasma plume.

[0094] In one embodiment, the plasma thermal power measuring device includes a thermal power measuring device at a plasma generation location and a thermal power measuring device at a plasma action location. The thermal power of the plasma plume at the generation location measured by the thermal power measuring device at the plasma generation location is added to the thermal power of the plasma plume at the action location measured by the thermal power measuring device at the plasma action location to obtain the total thermal power of the plasma plume.

[0095] The above description is merely an embodiment and does not limit the present invention in any way. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes, modifications, or modifications to the technical solution of the present invention into equivalent embodiments with equivalent changes using the technical content disclosed above. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A plasma thermal power measuring device, characterized in that: It includes a plasma plume flow chamber (1), a calorimetric chamber (2) and a calorimetric system (3); The plasma plume flow cavity (1) is made of heat-conducting material; The calorimetric chamber (2) is made of a heat-insulating material. The calorimetric chamber (2) is arranged on the outer wall of the plasma plume flow chamber (1). The outer wall of the calorimetric chamber (2) and the inner wall of the plasma plume flow chamber (1) form a calorimetric liquid flow channel (4). The calorimetric liquid flow channel (4) is provided with a liquid inlet (41) and a liquid outlet (42). The calorimetric liquid flows into the calorimetric liquid flow channel (4) from the liquid inlet (41), exchanges heat with the plasma plume flow chamber (1), and then flows out from the liquid outlet (42). The calorimetric system (3) includes a data collection part and a solution part, wherein the data collection part includes a liquid inlet temperature measurement sensor (31) provided on the liquid inlet (41) and a liquid outlet temperature measurement sensor (32) provided on the liquid outlet (42), and the data collection part also includes a calorimetric liquid flow measurement sensor for measuring the calorimetric liquid flow in the calorimetric liquid flow channel (4); the solution part includes a plasma thermal power calculation model, and the data collected by the data collection part is input into the plasma thermal power calculation model to obtain the thermal power of the plasma plume collected by the plasma plume flow cavity (1); The plasma plume flow chamber (1) comprises a collecting section (11) and a measuring section (12) which are sequentially arranged along the flow direction of the plasma plume; The measuring section (12) is a uniform cylindrical tube structure, and the collecting section (11) gradually expands from the end of the cylindrical tube structure to the upstream direction.

2. The plasma thermal power measuring device according to claim 1, wherein: The plasma thermal power calculation model is: ； Where, is the plasma thermal power, is the specific heat capacity of the calorimetric fluid, is the density of the calorimetric fluid, is the flow rate of the calorimetric fluid, is the temperature of the calorimetric liquid at the outlet, is the temperature of the calorimetric liquid at the liquid inlet.

3. The plasma thermal power measuring device according to claim 1, wherein: A valve (5) is provided at the outlet end of the plasma plume flow cavity (1).

4. The plasma thermal power measuring device according to claim 1, wherein: The solving part is realized by a circuit module (8), the circuit module (8) has the plasma thermal power calculation model programmed into a control chip, and the circuit module (8) further includes a signal access structure connected to the data collected.

5. The plasma thermal power measuring device according to any one of claims 1 to 4, characterized in that: The plasma thermal power measuring device is provided at two locations, namely a thermal power measuring device at the plasma generating location and a thermal power measuring device at the plasma acting location; The plasma generating location heat power measuring device is arranged on the plasma generating device (6), and the plasma plume flow cavity (1) of the plasma generating location heat power measuring device is the ionization channel (61) of the plasma generating device (6); The plasma plume flow cavity (1) of the plasma action thermal power measuring device is in communication with the tail jet channel (64) of the plasma generating device (6); The thermal powers of the plasma plume measured by the thermal power measuring device at the plasma generation location and the thermal power measuring device at the plasma generation location are added together to obtain the total thermal power of the plasma plume.

6. The plasma thermal power measuring device according to claim 5, wherein: The coil (63) of the plasma generating device (6) is a hollow coil, a cooling medium flows in the coil (63), and the coil (63) is located in the calorimetric fluid flow channel (4) of the thermal power measuring device at the plasma generating location; The actual thermal power obtained by the thermal power measurement device at the plasma generation location is: ； Where, is the actual thermal power of the thermal power measuring device at the plasma generation location, is the heat of the calorimetric fluid in the thermal power measuring device at the plasma generation location, is the heat of the outer wall of the coil (63).

7. The plasma thermal power measuring device according to claim 6, wherein: The heat of the outer wall of the coil (63) is: ； Where, The heat of the inner wall of the coil (63), Obtained by measuring the temperature change of the cooling water flowing into the coil (63), is the inner diameter of the coil (63), is the outer diameter of the coil (63).

8. A method for measuring plasma thermal power, characterized in that: Using the plasma thermal power measuring device according to any one of claims 1 to 7 comprises the following steps: S1, the plasma plume flows in the plasma plume flow chamber (1); S2, the heat of the plasma plume is transferred to the calorimetric fluid through the wall of the plasma plume flow chamber (1); S3, the data collection part of the calorimetric system (3) collects the inlet temperature, outlet temperature, flow rate, specific heat capacity and density of the calorimetric liquid, and inputs them into the solution part to collect and solve the thermal power of the plasma plume.

9. The plasma thermal power measuring device according to claim 8, wherein: The plasma thermal power measuring device includes a plasma generation location thermal power measuring device and a plasma action location thermal power measuring device. The thermal power of the plasma plume at the generation location measured by the plasma generation location thermal power measuring device is added to the thermal power of the plasma plume at the action location measured by the plasma action location thermal power measuring device to obtain the total thermal power of the plasma plume.

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