Mobile guide rail type technology based fluidics field analysis method, coordinate positioning method and system

Abstract

The present application relates to the technical field of gas explosion protection, and particularly relates to a jet field analysis method, a coordinate positioning method and a system based on mobile guide rail technology. The present application is based on the space axis symmetry theory and the boundary wave theory of gas leakage jet field, combined with remote control mobile technology and precise leakage field concentration testing technology, and proposes a jet field analysis method based on mobile guide rail technology; to realize accurate positioning, high reliability, without human intervention, thus reducing the experimental cost and improving the safety; can effectively avoid the existing technology, which generally adopts experimental test or data simulation, has a large deviation, low reliability and weak guiding significance for the actual scene; the analysis results are effectively used in the actual application of gas jet, to provide effective accident prevention measures for gas leakage, and to accurately obtain the jet field information at the same time of the accident, to determine the related information of the leakage point, and to timely and effectively position and rescue.

Description

Technical Field

[0001] This invention relates to the field of gas explosion protection technology, and in particular to a jet field analysis method, coordinate positioning method and system based on a moving guide rail technology. Background Technology

[0002] Industrial production environments contain many flammable and explosive gases, such as methane, ethane, propane, hydrogen, and carbon monoxide. The consequences of leaks leading to fires and explosions are unimaginable. Therefore, studying and determining the flow field distribution characteristics of these flammable and explosive gases after a leak is crucial for precise control, monitoring and early warning, and emergency response measures. This is essential for effectively reducing the probability and severity of such gas fires and explosions.

[0003] For high-pressure flammable and explosive gases, spontaneous combustion will occur once a leak occurs, making the study of their flow field distribution characteristics of limited practical significance. However, for the distribution characteristics of leaked gases stored in medium- and low-pressure containers, studying the flow field distribution characteristics after a leak is of great importance for accident prevention, especially the prevention of explosions. Currently, there are few experimental studies on the jet flow field distribution characteristics of leaked medium- and low-pressure gases, mainly due to the difficulty of experimental testing and various problems such as interference with the flow field and misalignment of sampling points. Existing methods for studying the spatial distribution characteristics of gas jet fields mainly fall into two categories: experimental and numerical simulation.

[0004] One approach is to conduct tests experimentally. However, this method currently requires setting up measurement points in the jet region or using handheld devices, which significantly disturbs the jet field and affects test accuracy. Manual operation lacks precise positioning technology, leading to significant discrepancies between the measured data and the expected location, resulting in high randomness. Furthermore, experimental testing methods are costly. For example, CN110736514B discloses a method for measuring the mass flow rate entrained by a sonic gas jet, belonging to the field of high-pressure gas jet mass measurement in fluid mechanics. High pressure causes this jet to reach sonic speeds at the nozzle exit. After exiting the jet, it continuously entrains background gas, and the mass of the moving mixed gas in the vertical cross-section continuously increases along the jet direction. This method, based on the conservation of momentum at the outlet and measurement sections during gas jet propagation, comprises five basic steps: experimentally measuring the mass flow rate of the gas at the jet outlet; calculating the local speed of sound at the outlet section; calculating the momentum of the gas at the outlet; experimentally obtaining the jet velocity at the measured section in the jet direction; and calculating the mass flow rate of the mixed gas at that section based on momentum conservation, and obtaining the mass of entrained background gas at that section by subtracting the mass at the outlet section. In actual measurement sampling, this technical solution employs either the displacement method or the partial pressure method. The basic principle of the displacement method is to calculate the flow rate by measuring the volume reduction of the gas after compression in a closed container. However, when the measured gas experiences temperature changes during compression, its density changes accordingly, affecting the accuracy of the measurement results. The partial pressure method estimates the mass flow rate by measuring the gas flow rate at different pressures. In practical applications, the pressure in the gas pipeline may fluctuate due to various factors. Such pressure fluctuations may lead to instability or deviation in the measurement results of the partial pressure method.

[0005] Secondly, research conducted through fluid numerical simulation is less common than research using precision optical instruments, and these studies primarily focus on macroscopic descriptions of phenomena. Existing jet field pressure and expansion models differ from reality. For example, CN103454396B discloses an experimental device for the spontaneous combustion and shock wave-induced ignition of high-pressure flammable gas leaks. The entire device includes test gas cylinders and nitrogen cylinders, high-pressure ventilation pipelines, pressure regulating valves, solenoid valves, pressure gauges, vacuum pumps, high-pressure storage tanks, pressure transmitters, ICP pressure sensors, photodiodes, rupture disc holders (containing rupture discs), downstream pipelines, schlieren, high-speed cameras, protective enclosures, and air compressors. While a high-speed camera is used to record images of flow field density changes to reflect the formation of external shock waves, spontaneous combustion, jet changes, and the development of the jet flame, and a data acquisition system is employed, relying solely on numerical simulation methods for studying gas jet fields is unreliable.

[0006] Based on the above, existing technologies for studying the distribution characteristics of leaked gas stored in medium and low-pressure containers, whether through experimental testing or data simulation, suffer from problems such as excessive deviations in sampling data due to the influence of various external factors, low reliability, and weak guidance for practical scenarios, which urgently need to be addressed. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a jet field analysis method based on a moving guide rail technology, comprising the following steps: Step 1: Set the jet device and its parameter information; Step 2: Based on the jet device, set up a moving guide rail sampling device, and use a remote control device to control the moving sampling device; Step 3: Based on the parameter information, turn on the jet device to obtain the experimental jet field; Step 4: Based on the experimental jet field, use a moving guide rail sampling device to take samples, obtain sampling data, and draw jet lines at the same time; Step 5: Based on the jet lines, establish a spatial coordinate formula and combine it with the sampling data to analyze the experimental jet field characteristics.

[0008] Furthermore, in step 1, the jet device includes a jet outlet, and the parameter information includes the jet pressure at the jet outlet and the orifice diameter at the jet outlet.

[0009] Furthermore, the jet outlet is located on the side wall of the jet device.

[0010] Furthermore, the central axis of the aperture of the jet outlet is perpendicular to the sidewall.

[0011] Furthermore, a nozzle is provided at the jet outlet.

[0012] Furthermore, in step 2, the moving guide rail sampling device includes a sampling guide rail and a movable sampler located above the sampling guide rail; The mobile sampler includes a sampling base and a fixed thin rod located above the sampling base and perpendicular to the sampling base. A sampling tube is provided on the fixed thin rod. The sampling tube includes a sampling port for sampling gas. The sampling tube is arranged parallel to the fixed thin rod. The sampling tube is raised and lowered on the fixed thin rod by a remote control device to adjust the position of the sampling port.

[0013] Furthermore, the sampling base is slidably connected to the sampling guide rail via rollers, and the sliding of the sampling base is controlled by a remote control device.

[0014] Furthermore, in step 2, based on the parameter information, the position of the jet outlet is set as the origin of the jet field, and the central axis is set as the central axis of the jet field; The sampling guide rail is located directly below the central axis of the jet field and coincides with the top-view projection of the central axis of the jet field; this can be confirmed using auxiliary tools such as tape measure, measuring tape, various lines, laser rangefinder, etc. The coordinate axis containing the central axis of the jet field is defined as the X-axis, and the coordinate axis perpendicular to the origin of the jet field and the central axis of the jet field is defined as the Y-axis.

[0015] Furthermore, in step 3, the jet device is activated based on the parameter information, the jet pressure is adjusted to the leakage pressure, and then stabilized for 3-5 seconds to obtain the experimental jet field.

[0016] Furthermore, the jet line mentioned in step 4 includes the jet edge line, the jet angle line, and the jet axis.

[0017] Furthermore, in step 4, the central axis of the jet field is set with m levels in a direction that gradually moves away from the jet outlet, where m is an integer greater than or equal to 1. That is, the levels in the direction that gradually moves away from the jet outlet are the 1st level, the 2nd level, ..., the mth level. Wherein, the distance between the first gear and the origin of the jet field is L1, and so on, the distance between the second gear and the origin of the jet field is L2, ..., the distance between the m-th gear and the origin of the jet field is L... m ; The sampling base in the mobile guide rail sampling device is positioned by controlling the remote control device. The sampling tube is aligned directly below the first position. This can be confirmed using auxiliary tools such as a tape measure, measuring tape, various lines, or a laser rangefinder. After aligning the sampling tube with the top-view projection of the first position, longitudinal sampling is performed from bottom to top towards the central axis of the jet field until stable data is obtained. At this point, the vertical distance between the sampling port and the first position is D1. The line connecting the sampling port and the origin of the jet field is the jet edge line, and the angle between the jet edge line and the central axis of the jet field is α. According to the Pythagorean theorem: From tanα = D1 / L1, we can deduce D1 = tanα × L1, and so on, we can obtain D2 = tanα × L2, ..., D m =tanα×L m ; Assuming each gear has n sampling points, then D1 is divided into n-1 equal parts at equal intervals. The sampling tube is then positioned perpendicular to the central axis of the jet field, and longitudinal sampling is performed sequentially. Let D be the sampling point located on the edge ray. 11 The sampling points that gradually approach the central axis of the jet field are D.11 D 12 ... D 1n ; And so on, D m The sample is divided into n-1 equal parts, and the included angle α is also divided into n-1 equal parts. The sampling tube is then used to sample longitudinally along the central axis of the jet field, perpendicular to the direction of rotation. Let the sampling point located on the edge ray be D. m1 The sampling points that gradually approach the central axis of the jet field are D. m1 D m2 ... D mn ; The D 11 D 21 ... D m1 The sampling port is located sequentially along the edge of the jet and gradually moves away from the origin of the jet field; when the sampling port is located at D... mn When the sampling port is located at point D, the line connecting the sampling port and the origin of the jet field is defined as the jet axis, and the jet axis coincides with the central axis of the jet field and the X-axis; when the sampling port is located at point D... 1r ... D mr When r is an integer greater than 1 and less than n, the line connecting the sampling port and the origin of the jet field is set as the jet angle line; the number of the jet angle lines is n-2.

[0018] Furthermore, the sampling sequence is as follows: first, sampling is performed at the first gear position, and then sampling points D are obtained sequentially. 11 D 12 ... D 1n The data is then used to move the sampling base in the moving guide rail sampling device to sample the second position, and sampling points D are obtained sequentially. 21 D 22 ... D 2n The data is collected sequentially until the m-th sampling point D is completed. m1 D m2 ... D mn The data involves completing the sampling of all sampling points in the jet field, obtaining the sampling data of each sampling point, and drawing the jet lines.

[0019] Furthermore, the sampling guide rail uses the top-view projection of the origin of the jet field as the origin of the guide rail swing. The sampling guide rail swings horizontally with the origin of the guide rail swing, and the mobile sampler located on the sampling guide rail also moves with the sampling guide rail, thereby obtaining all the sampling data of the entire jet field and drawing the overall spatial jet line of the entire jet field.

[0020] Furthermore, the angle β of the sampling guide rail swing is between 0 and 180°.

[0021] Furthermore, the sampling data is the gas volume fraction obtained at the sampling point.

[0022] Furthermore, the formula for the spatial coordinates located in the plane perpendicular to the sampling guide rail in step 5 is as follows: Sampling point D mn X coordinate: x 所有射流线取样点横坐标 =L m ; Sampling point D mn Y-coordinate: y 射流轴线取样点纵坐标 =0; y 射流边线取样点纵坐标 = D m = L m ×tanα; y 其余射流角度线取样点纵坐标 = L m ×tan[α×j / (n-1)]; Among them, L m The distance between the m-th gear and the origin of the jet is a straight line, where m is an integer greater than or equal to 1; D m The vertical distance between the sampling point located on the edge of the jet in the m-th gear and the axis of the jet; α is the angle between the jet edge and the jet axis; n is in D m The number of sampling points after equal interval division; The value of j is an integer from 1 to n-2, and is adjusted according to the position of the sampling point.

[0023] Furthermore, based on the spatial axisymmetric theory of gas leakage jet field, only the data of the part of the jet axis close to the sampling device of the moving guide rail needs to be obtained to obtain the data of the entire jet field symmetrically, so as to analyze the characteristics of the jet field, including the jet field morphology and characteristic distribution.

[0024] Furthermore, the sampled data is analyzed using data processing software such as OriginLab.

[0025] Furthermore, the gas is a flammable or explosive gas or a mixture of one or more of the following: air and inert gases; Including but not limited to one or more pure substances or mixtures of several of the following: methane, ethane, propane, hydrogen, and carbon monoxide, or a mixture of flammable and explosive gases with air and helium.

[0026] Furthermore, the jet pressure is medium to low pressure, specifically 0.5-10 MPa.

[0027] Furthermore, the diameter of the jet outlet is 5-100 mm.

[0028] The present invention also provides a jet field coordinate positioning method based on the moving guide rail technology. The coordinate positioning method is as follows: based on the above-mentioned jet field analysis method based on the moving guide rail technology, the characteristics of the leaking gas under different leakage pressures and different leakage orifice diameters are obtained, and the gas that has leaked is located by coordinate positioning. Specifically, the steps include the following: Step 1: Obtain leaked gas parameter information; Step 2: Based on the parameter information, set up a moving guide rail sampling device, and use a remote control device to control the moving guide rail sampling device and sample, and obtain sampling data; Step 3: Based on the sampling data, perform coordinate positioning, draw jet lines, analyze the jet field where the leak occurred, and obtain specific information about the leak point.

[0029] Furthermore, the leaked gas parameter information mentioned in step 1 includes the properties of the leaked gas, which is used to compare the jet field characteristics corresponding to different leaked gases.

[0030] Furthermore, the leaked gas is a flammable or explosive gas or a mixture of one or more of the following: air and inert gases; Including but not limited to one or more pure substances or mixtures of several of the following: methane, ethane, propane, hydrogen, and carbon monoxide, or a mixture of flammable and explosive gases with air and helium.

[0031] Furthermore, the nature of the leaked gas is determined by identifying what kind of gas it is or a mixture of several gases in different proportions.

[0032] Furthermore, the specific information about the leak point includes, but is not limited to: the location of the leak point, the diameter of the leak point, the leakage pressure, and the rate of leakage gas.

[0033] The present invention also provides an analysis system for implementing the above-mentioned jet field analysis method based on the moving guide rail technology, comprising: Gas storage cylinders, jetting devices, mobile guide rail sampling devices, remote control devices, and gas volume detection devices; The jet device is equipped with nozzles on its sidewall; The moving guide rail sampling device includes a sampling guide rail and a movable sampler located above the sampling guide rail; The remote control device is electrically connected to the moving guide rail sampling device to control the moving guide rail sampling device; The mobile sampler includes a sampling base and a fixed thin rod located above the sampling base and perpendicular to the sampling base, and a sampling tube is provided on the fixed thin rod; The sampling tube includes a sampling port; The gas volume detection device is connected to the sampling tube to convert the sampling data obtained by the sampling tube at the sampling port into a gas volume fraction.

[0034] Furthermore, the gas storage cylinder is used to provide a gas source for the jet device.

[0035] Furthermore, the gas storage cylinder is connected to the jetting device via a pipe, and the pipe is equipped with a mass flow meter and a valve.

[0036] Furthermore, the jet device also includes a pressure sensor for setting and reading pressure values.

[0037] Furthermore, the gas storage cylinder is opened, and the gas in the gas storage cylinder is controlled to enter the jet device for jetting through the mass flow meter and the valve. The experimental jet field is sampled through the set moving guide rail sampling device and the remote control device that controls the moving guide rail sampling device. The obtained sample is converted into sampling data, i.e. gas volume fraction, on the gas volume detection device through the sampling tube. Meanwhile, the characteristics of the experimental jet field are analyzed based on the spatial coordinates of the sampling port and the sampling data.

[0038] Furthermore, the spatial coordinates are obtained through manual calculation or by a coordinate calculation unit set in an electronic device.

[0039] The beneficial effects of this invention are as follows: 1. This invention proposes a jet field analysis method based on the spatial axisymmetric theory and boundary wave theory of gas leakage jet fields, combined with remote control mobile technology and precise leakage field concentration testing technology. This method achieves precise positioning, high reliability, and eliminates the need for manual intervention, thus reducing experimental costs and improving safety. It effectively avoids the technical problems of excessive deviation, low reliability, and weak guidance for actual scenarios that are commonly found in existing technologies that use experimental testing or data simulation. For example, it provides technical support for accurately obtaining the spatial distribution of gas concentration after leakage on-site, eliminating the need for close-range, highly interfering, time-consuming, labor-intensive, and dangerous methods such as manually holding a concentration tester on-site, ensuring the accuracy and representativeness of sampling points. 2. The jet field analysis method based on the mobile guide rail technology of this invention can realize the construction and analysis of experimental jet fields for different leaked gases, reducing the human operation links and thus reducing the error caused by human factors. The analysis results can be effectively used in the actual application of gas jets, providing effective accident prevention measures for gas leaks, and accurately obtaining jet field information at the same time as an accident, so as to determine relevant information such as the leak point, and timely and effective location and rescue. 3. The equipment setup and connection of the jet field analysis system based on the mobile guide rail technology of this invention are simpler than those of existing technologies such as schlieren technology and high-definition camera technology or a combination of both. Furthermore, relying on existing remote control movement technology and precise leakage field concentration testing technology, it can accurately complete the analysis and spatial positioning of the jet field, improving experimental efficiency and reducing trial-and-error costs. This lays the foundation for rapid and accurate gas jet field sampling and distribution characteristic analysis. The system of this invention makes the analysis method more convenient, simple, fast, accurate in positioning, low in cost, and easy to operate, thus well meeting the needs of engineering applications. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the jet field analysis system based on the moving guide rail technology of the present invention; Figure 2 This is a schematic diagram of the structure of the mobile sampler of the present invention; Figure 3 This is a top view of the mobile sampler of the present invention; Figure 4 A schematic diagram of the jet lines drawn for an embodiment of the present invention; Figure 5 This is a top view of the sampling guide rail of the present invention performing a horizontal fan-shaped swing. Figure 6 The analysis results of the jet axis in the embodiment of the present invention; Figure 7 The analysis results of the jet angle line in the embodiment of the present invention; Figure 8 The analysis results of the jet edge line in the embodiment of the present invention; Figure 9 The schlieren effect diagram used to verify the embodiments of the present invention; The names of the labels in the diagram are: 1. Gas storage cylinder; 2. Jetting device; 201. Nozzle; 202. Pressure sensor; 3. Moving guide rail sampling device; 301. Sampling guide rail; 302. Moving sampler; 3021. Sampling base; 3022. Fixed rod; 3023. Sampling tube; 3024. Sampling port; 4. Remote control device; 5. Gas volume detection device; 6. Pipeline; 601. Mass flow meter; 602. Valve. Detailed Implementation

[0041] Example 1 like Figure 1-4 As shown, this embodiment provides a jet field analysis method based on moving guide rail technology, including the following steps: Step 1: Set the jet device 2 and its parameter information; The jet device 2 includes a jet outlet, and the parameter information includes the jet pressure of the jet outlet, which is 2 MPa in this embodiment, and the orifice diameter of the jet outlet, which is 5 mm in this embodiment. In this embodiment, the jet outlet is located on the side wall of the jet device 2; the central axis of the jet outlet aperture is perpendicular to the side wall; and a nozzle 201 is provided at the jet outlet. Step 2: Based on the jet device 2, set up a moving guide rail sampling device 3, and use a remote control device 4 to control the moving guide rail sampling device 3; The mobile guide rail sampling device 3 includes a sampling guide rail 301 and a mobile sampler 302 located above the sampling guide rail 301. like Figure 2 As shown, the mobile sampler 302 includes a sampling base 3021 and a fixed thin rod 3022 located above the sampling base 3021 and perpendicular to the sampling base 3021. The fixed thin rod 3022 is provided with a sampling tube 3023. The sampling tube 3023 includes a sampling port 3024, which is used to sample the gas. The sampling tube 3023 is arranged parallel to the fixed thin rod 3022. The sampling tube 3023 is raised and lowered on the fixed thin rod 3022 by the remote control device 4 to adjust the position of the sampling port 3024.

[0042] The sampling base 3022 is slidably connected to the sampling guide rail 301 via rollers, and the sliding of the sampling base 3021 is controlled by the remote control device 4. Meanwhile, based on the aforementioned parameter information, the location of the jet outlet is set as the origin of the jet field, and the central axis is set as the central axis of the jet field; like Figure 3 As shown, the sampling guide rail 301 is located directly below the central axis of the jet field and coincides with the top view projection of the central axis of the jet field. In this embodiment, it can be confirmed by auxiliary tools, such as tape measure, measuring tape, various lines, laser rangefinder, etc. The coordinate axis containing the central axis of the jet field is defined as the X-axis, and the coordinate axis perpendicular to the origin of the jet field and the central axis of the jet field is defined as the Y-axis.

[0043] Step 3: Based on the parameter information, turn on the jet device 2, adjust the jet pressure to the leakage pressure, stabilize for 3-5 seconds, and obtain the experimental jet field.

[0044] Step 4: Based on the experimental jet field, use the moving guide rail sampling device 3 to take samples, obtain sampling data, and draw the jet lines at the same time; The jet line includes the jet edge line, the jet angle line, and the jet axis.

[0045] In this embodiment, as Figure 4 As shown, the central axis of the jet field is set with three gears in sequence, moving away from the jet outlet. The gears are designated as gear 1, gear 2, and gear 3 in sequence, moving away from the jet outlet. Wherein, the distance between the first gear and the origin of the jet field is L1, which is 10cm, and so on, the distance between the second gear and the origin of the jet field is L2, which is 30cm, and the distance between the third gear and the origin of the jet field is L3, which is 50cm; The remote control device 4 controls the position of the sampling base 3021 in the mobile guide rail sampling device 3, aligning the sampling tube 3023 directly below the first position. This can be confirmed using auxiliary tools such as a tape measure, measuring tape, various lines, or a laser rangefinder. After aligning the sampling tube 3023 with the top-view projection of the first position, longitudinal sampling is performed from bottom to top towards the central axis of the jet field until stable data is obtained. At this point, the vertical distance between the sampling port 3024 and the first position is D1, the line connecting the sampling port 3024 and the origin of the jet field is the jet edge line, and the angle between the jet edge line and the central axis of the jet field is α. According to the Pythagorean theorem: From tanα = D1 / L1, we can deduce D1 = tanα × L1, and so on, we can obtain D2 = tanα × L2, ..., D m =tanα×L m At this point, α in this embodiment is captured and calculated by a high-speed camera, specifically 15°.

[0046] In this embodiment, assuming there are 3 sampling points for each gear position, D1 is divided into 2 equal parts at equal intervals. The sampling tube 3023 is then used to perform longitudinal sampling sequentially, perpendicular to the central axis of the jet field. Let the sampling point located on the edge ray be D. 11 The sampling points that gradually approach the central axis of the jet field are D. 11 D 12 D 13 ; Similarly, D3 is divided into two equal parts, and the included angle α is also divided into two equal parts. The sampling tube 3023 is then used to perform longitudinal sampling vertically close to the central axis of the jet field. Let the sampling point located on the edge ray be D. 31 The sampling points that gradually approach the central axis of the jet field are D. 31 D 32 D 33 ; The D11 D 21 D 31 The sampling port is located sequentially along the edge of the jet and gradually moves away from the origin of the jet field; when the sampling port is located at D... 33 When the sampling port is located at D, the line connecting the sampling port and the origin of the jet field is defined as the jet axis, and the jet axis coincides with the central axis of the jet field and the X-axis; when the sampling port 3024 is located at D 12 D 22 D 32 When r is 2, the line connecting the sampling port 3024 and the origin of the jet field is set as the jet angle line; the number of the jet angle lines is 1. The sampling order is as follows: first, sampling is performed at the first gear position, and then sampling points D are obtained sequentially. 11 D 12 D 13 The data is then used to move the sampling base 3021 in the moving guide rail sampling device 2 to sample the second position, and the sampling points D are obtained sequentially. 21 D 22 D 23 The data is collected sequentially until all sampling points D at the third gear level are taken. 31 D 32 D 33 The data, namely, the sampling of all sampling points in the jet field, obtaining the sampling data of each sampling point, and plotting as shown in the figure. Figure 4 The jet lines shown.

[0047] In this embodiment, as Figure 5 As shown, the sampling guide rail 301 uses the top-view projection of the origin of the jet field as the origin of the guide rail swing. The sampling guide rail 301 swings horizontally in a fan shape with the remote control device 4 around the origin of the guide rail swing. At the same time, the mobile sampler 302 located on the sampling guide rail 301 also moves with the sampling guide rail 301, thereby obtaining all the sampling data of the entire jet field and drawing the overall spatial jet line of the entire jet field.

[0048] The angle β of the swing of the sampling guide rail 301 is 180°.

[0049] The sampling data is the gas volume fraction obtained at the sampling point.

[0050] Step 5: Based on the jet lines, establish a spatial coordinate formula and combine it with the sampling data to analyze the experimental jet field characteristics.

[0051] Furthermore, the spatial coordinate formula located in the plane perpendicular to the sampling guide rail 301 is specifically as follows: In this embodiment, sampling point D is used. 22 For example: Sampling point D 22 X coordinate: x 所有射流线取样点横坐标 =L2=30cm; Sampling point D 22 Y-coordinate: y 射流轴线取样点纵坐标 =0; y 射流边线取样点纵坐标 =D m = L m ×tanα=30cm×tan15°=8cm; y 其余射流角度线取样点纵坐标 = L m ×tan[α×j / (n-1)]=30cm×tan[15°×1÷2]=4cm; Based on the spatial axisymmetric theory of gas leakage jet field, only the data of the part of the jet axis close to the sampling device 2 of the moving guide rail needs to be obtained to obtain the data of the entire jet field symmetrically, so as to analyze the characteristics of the jet field, including the jet field morphology and characteristic distribution.

[0052] In this embodiment, the sampling data is analyzed using the data processing software OriginLab, and the analysis results of the jet axis are as follows: Figure 6 The analysis results of the jet angle line are as follows: Figure 7 As shown, the analysis results of the jet edge are as follows: Figure 8 As shown, the characteristics of the hydrogen jet field in this embodiment can be clearly obtained.

[0053] To ensure the authenticity and reliability of the data in this embodiment, this embodiment also uses schlieren technology from the prior art to verify the experimental conclusions. The verification results are as follows: Figure 9 As shown, through Figure 9 It can be seen that the jet field morphology distribution map obtained by repeatedly taking high-definition pictures using schlieren technology is consistent with the experimental results obtained in this embodiment. That is, this embodiment can obtain jet field information of different gases under different pressure ranges without relying on the unstable schlieren technology, combined with the moving guide rail technology. This provides effective accident prevention measures for gas leaks, and can accurately obtain jet field information at the same time as an accident, so as to determine the relevant information of the leak point and carry out timely and effective location and rescue.

[0054] Example 2 like Figure 1-4 As shown, this embodiment also provides an analysis system for implementing the jet field analysis method based on the moving guide rail technology in Embodiment 1, including: Gas storage cylinder 1, jet device 2, moving guide rail sampling device 3, remote control device 4, gas volume detection device 5; The jet device 2 has a nozzle 201 on its side wall; The moving guide rail sampling device 3 includes a sampling guide rail 301 and a moving sampler 302 located above the sampling guide rail 301. The remote control device 4 is electrically connected to the moving guide rail sampling device 3 to control the moving guide rail sampling device 3; The mobile sampler 302 includes a sampling base 3021 and a fixed thin rod 3022 located above the sampling base 3021 and perpendicular to the sampling base 3021. A sampling tube 3023 is provided on the fixed thin rod 3022. The sampling tube 3023 includes a sampling port 3024; The gas volume detection device 5 is connected to the sampling tube 3023 to convert the sampling data obtained by the sampling tube 3023 at the sampling port 3024 into a gas volume fraction.

[0055] The gas storage cylinder 1 is used to provide a gas source for the jet device 2. In this embodiment, the gas source is hydrogen.

[0056] The gas storage cylinder 1 is connected to the jet device 2 via a pipe 6, and the pipe 6 is equipped with a mass flow meter 601 and a valve 602.

[0057] The jet device 2 also includes a pressure sensor 202 for setting and reading pressure values. In this embodiment, the set pressure value is the jet pressure value in Embodiment 1, which is 2 MPa.

[0058] The gas storage cylinder 1 is opened, and the gas in the gas storage cylinder 1 is controlled to enter the jet device 2 for jetting through the mass flow meter 601 and the valve 602. The experimental jet field is sampled through the set moving guide rail sampling device 3 and the remote control device 4 that controls the moving guide rail sampling device 3. The obtained sample is converted into sampling data, i.e. gas volume fraction, on the gas volume detection device 5 through the sampling tube 3023. Meanwhile, the characteristics of the experimental jet field were analyzed based on the spatial coordinates corresponding to sampling port 3024 and the sampling data.

[0059] In this embodiment, the calculation formula is input into the computer as a program, so the spatial coordinates can be calculated by the coordinate calculation unit set in the computer.

[0060] It should be understood that the present invention is not limited to what has been described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A jet field analysis method based on moving guide rail technology, characterized in that, Includes the following steps: Step 1: Set the jet device and its parameter information; Step 2: Based on the jet device, set up a moving guide rail sampling device, and use a remote control device to control the moving sampling device; Step 3: Based on the parameter information, turn on the jet device to obtain the experimental jet field; Step 4: Based on the experimental jet field, use a moving guide rail sampling device to take samples, obtain sampling data, and draw jet lines at the same time; Step 5: Based on the jet lines, establish a spatial coordinate formula and combine it with the sampling data to analyze the experimental jet field characteristics.

2. The jet field analysis method based on moving guide rail technology according to claim 1, characterized in that, In step 1, the jet device includes a jet outlet, and the parameter information includes the jet pressure at the jet outlet and the orifice diameter at the jet outlet.

3. The jet field analysis method based on the moving guide rail technology according to claim 1, characterized in that, The moving guide rail sampling device in step 2 includes a sampling guide rail and a movable sampler located above the sampling guide rail; The mobile sampler includes a sampling base and a fixed thin rod located above the sampling base and perpendicular to the sampling base. A sampling tube is provided on the fixed thin rod. The sampling tube includes a sampling port for sampling gas. The sampling tube is arranged parallel to the fixed thin rod. The sampling tube is raised and lowered on the fixed thin rod by a remote control device to adjust the position of the sampling port.

4. The jet field analysis method based on the moving guide rail technology according to claim 1, characterized in that, In step 3, the jet device is turned on based on the parameter information, the jet pressure is adjusted to the leakage pressure, and then stabilized for 3-5 seconds to obtain the experimental jet field.

5. The jet field analysis method based on the moving guide rail technology according to claim 1, characterized in that, The jet lines mentioned in step 4 include the jet edge lines, jet angle lines, and jet axis lines.

6. The jet field analysis method based on the moving guide rail technology according to claim 1, characterized in that, The formula for the spatial coordinates located in the plane perpendicular to the sampling guide is as follows: Sampling point D mn X coordinate: x 所有射流线取样点横坐标 =L m ; Sampling point D mn Y-coordinate: y 射流轴线取样点纵坐标 =0； y 射流边线取样点纵坐标 = D m = L m ×tanα; y 其余射流角度线取样点纵坐标 = L m ×tan[α×j / (n-1)]; Among them, L m The distance between the m-th gear and the origin of the jet is a straight line, where m is an integer greater than or equal to 1; D m The vertical distance between the sampling point located on the edge of the jet in the m-th gear and the axis of the jet; α is the angle between the jet edge and the jet axis; n is in D m The number of sampling points after equal interval division; The value of j is an integer from 1 to n-2, and is adjusted according to the position of the sampling point.

7. The jet field analysis method based on the moving guide rail technology according to any one of claims 1-6, characterized in that, The jet pressure is medium to low pressure, specifically 0.5-10 MPa.

8. The jet field analysis method based on the moving guide rail technology according to any one of claims 1-6, characterized in that, The diameter of the jet outlet is 5-100 mm.

9. A jet field coordinate positioning method based on moving guide rail technology, characterized in that, The coordinate positioning method is as follows: the jet field analysis method based on the moving guide rail technology according to any one of claims 1-8 obtains the jet field characteristics of the leaking gas under different leakage pressures and different leakage orifice diameters, and performs coordinate positioning of the leaking gas.

10. An analysis system for implementing the jet field analysis method based on the moving guide rail technology as described in any one of claims 1-8, characterized in that, include: Gas storage cylinders, jetting devices, mobile guide rail sampling devices, remote control devices, and gas volume detection devices; The jet device is provided with nozzles on its side wall; The moving guide rail sampling device includes a sampling guide rail and a movable sampler located above the sampling guide rail; The remote control device is electrically connected to the moving guide rail sampling device to control the moving guide rail sampling device; The mobile sampler includes a sampling base and a fixed thin rod located above the sampling base and perpendicular to the sampling base, and a sampling tube is provided on the fixed thin rod; The sampling tube includes a sampling port; The gas volume detection device is connected to the sampling tube to convert the sampling data obtained by the sampling tube at the sampling port into a gas volume fraction.

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