A quantitative measurement device and evaluation method for permeation of pneumatic metamaterials

Abstract

The present invention discloses a pneumatic metamaterial permeation quantitative measurement device and evaluation method, the device includes an air inlet component, an air outlet component and a shell, a partition separating an upstream chamber and a downstream chamber is provided in the shell, a through hole is provided on the partition, the pneumatic metamaterial covers the through hole, the air inlet component is connected with the upstream chamber, the air outlet component is connected with the downstream chamber, a first pressure sensor and a second pressure sensor capable of measuring the pressure in the upstream chamber and the downstream chamber are provided on the shell, and a flow meter is provided on the air outlet component. The present invention is applied to the field of permeation capacity evaluation, and the pressure difference is calculated by measuring the pressure of the upstream chamber and the downstream chamber, and the pressure difference is combined with the flow measured by the flow meter to evaluate the permeation performance of the pneumatic metamaterial, and the required equipment is less, the assembly and use are simple, the operation is simple and fast, and the measurement accuracy is high, and it can be effectively applied to the quantitative permeation measurement and permeation performance evaluation of pneumatic materials in the aerospace field.

Description

Technical Field

[0001] The present invention relates to the technical field of percolation capacity evaluation of pneumatic metamaterials, and in particular to a pneumatic metamaterial percolation quantitative measurement device and an evaluation method. Background Art

[0002] Permeable aerodynamic materials have broad application prospects in the field of aircraft manufacturing. During the flight of an aircraft, gas permeation can reduce heat and drag, thereby improving the flight performance of the aircraft. Accurately measuring and evaluating the permeability of these permeable materials is crucial to selecting materials with appropriate permeability for use in aircraft manufacturing.

[0003] At present, a large number of studies on seepage and seepage measurement are in the field of geology, mainly focusing on seepage between various types of rocks and soils, with the fluid being mainly liquid; and the corresponding seepage measurement devices are also mainly used in the field of geology, such as measuring the seepage effect of water on dams and the seepage effect on mine soil, etc. There are relatively few studies on seepage measurement of seepage materials with gas as the fluid, and the content is also more diverse; and the seepage measurement research of seepage materials used for the purpose of aircraft manufacturing only accounts for a part of it.

[0004] The seepage measurement device currently made for gas fluids includes a triaxial seepage device made by Guizhou University to measure the change in the content of mixed gas; this device solves the technical problem of the influence of the concentration of mixed gas with variable concentration ratio on the gas permeability, and can also measure the concentration of each component of the outlet mixed gas, solving the problem that the mixed gas of the previous seepage equipment must be pre-set with gas cylinders of different concentrations, and the concentration ratio of the mixed gas cannot be flexibly adjusted. However, the triaxial seepage device is mainly designed for gas experiments and cannot be used for solid experiments. It is not suitable for aircraft manufacturing materials in the aerospace field. The existing quantitative seepage measurement devices and methods are rarely used in aircraft manufacturing materials in the aerospace field. There is a lack of a simple, fast, and high-precision device for simply measuring the seepage of aircraft surface materials, and there is also a lack of a method for evaluating the seepage performance of pneumatic seepage materials. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a quantitative measurement device and evaluation method for the permeation of aerodynamic metamaterials, thereby realizing quantitative measurement of the permeation of aircraft surface materials and evaluation of the permeation performance, and the operation is simple, fast and highly accurate.

[0006] To achieve the above-mentioned object, the present invention provides a pneumatic metamaterial permeation quantitative measurement device, comprising an air inlet component, an air outlet component and a hollow shell, wherein a partition is provided in the shell to separate the internal space of the shell into an upstream chamber and a downstream chamber;

[0007] The partition is provided with a through hole connecting the upstream chamber and the downstream chamber, and the partition is provided with a fixing component to fix the pneumatic metamaterial to cover the through hole;

[0008] The air intake assembly is in communication with the upstream chamber, and the housing is provided with a first pressure sensor capable of measuring the pressure in the upstream chamber;

[0009] The gas outlet assembly is in communication with the downstream chamber, and the housing is provided with a second pressure sensor capable of measuring the pressure in the downstream chamber;

[0010] The gas outlet component is provided with a flow meter.

[0011] In one embodiment, the fixing assembly includes a pressure plate of an annular structure;

[0012] The pressing plate is detachably connected to the partition plate by bolts, and the pneumatic metamaterial is clamped between the pressing plate and the partition plate;

[0013] The through hole is located at one end of the pneumatic metamaterial, and the ring opening of the pressure plate is located at the other end of the pneumatic metamaterial.

[0014] In one embodiment, a sealing component is provided between the pneumatic metamaterial and the pressure plate and the partition.

[0015] In one embodiment, the sealing assembly includes a first sealing gasket and a second sealing gasket in an annular structure;

[0016] A first groove is provided on the partition at a position corresponding to the edge of the through hole, and a second groove is provided on the partition at a position corresponding to the edge of the ring opening;

[0017] The outer ring portion at one end of the first sealing gasket is embedded in the first groove, and the inner ring portion at the other end is provided with a first clamping groove;

[0018] The outer ring portion at one end of the second sealing gasket is embedded in the second groove, and the inner ring portion at the other end is provided with a second clamping groove;

[0019] The first clamping groove and the second clamping groove form an annular groove, and the edge portion of the pneumatic metamaterial is embedded in the annular groove.

[0020] In one embodiment, the housing is provided with a plurality of first mounting holes communicating with the upstream chamber for mounting the first pressure sensors of different precisions and ranges;

[0021] The shell is provided with a plurality of second mounting holes communicating with the downstream chamber for mounting the second pressure sensors with different precisions and ranges.

[0022] In one embodiment, the air intake assembly includes an air storage tank, a pressure reducing valve and an air source inlet pipeline;

[0023] One end of the gas source inlet pipeline is connected to the shell and communicates with the upstream chamber, and the other end is connected to the gas storage tank. The pressure reducing valve is arranged on the gas source inlet pipeline.

[0024] In one embodiment, the gas outlet assembly includes a gas source outlet pipe and a flow meter;

[0025] One end of the gas source outlet pipe is connected to the shell and communicates with the downstream chamber, and the other end extends to the outside. The flow meter is arranged on the gas source outlet pipe.

[0026] To achieve the above object, the present invention further provides a pneumatic metamaterial percolation evaluation method, using the above-mentioned pneumatic metamaterial percolation quantitative measurement device, the pneumatic metamaterial percolation evaluation method comprises the following steps:

[0027] Fixing the pneumatic metamaterial in the housing and assembling the pneumatic metamaterial permeation quantitative measurement device;

[0028] Control the air intake assembly to inject gas into the upstream chamber, record the readings of the first pressure sensor, the second pressure sensor and the flow meter when the flow meter reading is stable, and obtain the current material seepage pressure drop by subtracting the readings of the first pressure sensor and the second pressure sensor;

[0029] Adjust the pressure of the gas injected into the upstream chamber by the air intake assembly, and when the flow meter reading is stable, record the readings of the first pressure sensor, the second pressure sensor and the flow meter again, and obtain the current material seepage pressure drop, and repeat the operation until several sets of corresponding flow meter readings and material seepage pressure drops are obtained;

[0030] With the flow meter reading as the horizontal coordinate and the material seepage pressure drop as the vertical coordinate, the pressure drop and flow rate relationship curve of the pneumatic metamaterial is fitted;

[0031] The permeability of the pneumatic metamaterial is calculated based on the pressure drop and flow rate relationship curve, and the permeability performance of the pneumatic metamaterial is evaluated according to the permeability.

[0032] In one embodiment, the permeability of the aerodynamic metamaterial is calculated based on the pressure drop and flow relationship curve, specifically:

[0033]

[0034] in, is the pressure gradient along the seepage direction, is the flow rate of the seepage fluid, is the air viscosity coefficient, is the permeability.

[0035] In one embodiment, the permeability of the aerodynamic metamaterial is calculated based on the pressure drop and flow relationship curve, specifically:

[0036]

[0037] in, is the pressure gradient along the seepage direction, is the flow rate of the seepage fluid, is the air viscosity coefficient, is the Forchheimer coefficient, is the gas constant of air, is the permeability.

[0038] Compared with the prior art, the present invention has the following beneficial technical effects:

[0039] 1. The pneumatic metamaterial permeation quantitative measurement device of the present invention places the pneumatic metamaterial in a shell, measures the pressure of the upstream chamber and the downstream chamber to calculate the pressure difference, tests the permeation capacity of the pneumatic metamaterial, and combines it with the flow measured by the flow meter to evaluate the permeation performance of different pneumatic metamaterials. The whole process requires less equipment, is easy to assemble and use, is simple and fast to operate, has high measurement accuracy, and can be effectively applied to the quantitative permeation measurement and permeation performance evaluation of pneumatic materials in the aerospace field;

[0040] 2. The pneumatic metamaterial permeation evaluation method of the present invention uses the flow rate at the same pressure drop as the evaluation standard, which is suitable for the practical application of the material in the aerospace field for aircraft manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0042] Figure 1 Schematic diagram of the overall structure of the seepage quantitative measurement device in an embodiment of the present invention;

[0043] Figure 2 Schematic diagram of the internal structure of the housing in an embodiment of the present invention;

[0044] Figure 3 1 is an example diagram of a curve of relationship between pressure drop and flow rate in an embodiment of the present invention.

[0045] Figure numbers: shell 1, base 101, cover 102, sealing ring 103, partition 104, first mounting hole 105, second mounting hole 106, pneumatic metamaterial 2, first pressure sensor 3, second pressure sensor 4, air source inlet pipe 5, air storage tank 6, flow meter 7, air source outlet pipe 8, data processor 9, pressure plate 10, first sealing gasket 11, second sealing gasket 12.

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] 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 components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] 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 the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] like Figure 1 , Figure 2 The figure shows a pneumatic metamaterial permeation quantitative measurement device (hereinafter referred to as "permeation quantitative measurement device") disclosed in the present embodiment, which is mainly used for quantitative measurement of the permeation capacity of the pneumatic metamaterial 2. Specifically, the permeation quantitative measurement device includes an air inlet component, an air outlet component and a hollow shell 1. A partition 104 is fixedly arranged in the shell 1, thereby dividing the internal space of the shell 1 into an upstream chamber and a downstream chamber. A through hole connecting the upstream chamber and the downstream chamber is opened on the partition 104, and the upstream chamber and the downstream chamber are not connected at other positions except through the through hole. A fixing component is arranged on the partition 104, and the pneumatic metamaterial 2 can be fixedly covered on the through hole by the fixing component, so that the gas in the upstream chamber can permeate to the downstream chamber through the pneumatic metamaterial 2. The air inlet assembly is connected to the upstream chamber, and a first pressure sensor 3 capable of measuring the pressure in the upstream chamber is provided on the shell 1. The air outlet assembly is connected to the downstream chamber, and a second pressure sensor 4 capable of measuring the pressure in the downstream chamber is provided on the shell 1. A flow meter 7 is provided on the air outlet assembly.

[0053] The quantitative permeation measurement device in this embodiment places the pneumatic metamaterial 2 in the shell 1, calculates the pressure difference by measuring the pressure of the upstream chamber and the downstream chamber, tests the permeation capacity of the pneumatic metamaterial 2, and combines it with the flow measured by the flowmeter 7 to evaluate the permeation performance of different pneumatic metamaterials 2. The whole process requires less equipment, is easy to assemble and use, simple and fast to operate, and has high measurement accuracy. It can be effectively applied to the quantitative permeation measurement and permeation performance evaluation of pneumatic materials in the aerospace field.

[0054] In the specific implementation process, the shell 1 is a closed autoclave structure, including a base 101 with an opening at the top and a cover plate 102 fixedly connected to the opening of the base 101 by bolts, and the cover plate 102 is detachable to fix the gas metamaterial in the shell 1, and a sealing ring 103 is provided on the mating surface of the base 101 and the cover plate 102. A step structure is provided on the inner wall of the base 101 along the circumferential direction, and the partition plate 104 is welded on the step structure.

[0055] In the specific implementation process, the fixing component includes a pressure plate 10 with an annular structure, which is detachably connected to the partition 104 by bolts, and the pneumatic metamaterial 2 is fixedly clamped between the pressure plate 10 and the partition 104, the through hole is located at one end of the pneumatic metamaterial 2, and the ring mouth of the pressure plate 10 is located at the other end of the pneumatic metamaterial 2.

[0056] As a preferred embodiment, a sealing component is also provided between the pneumatic metamaterial 2 and the pressure plate 10 and the partition 104. Specifically, the sealing component includes a first sealing gasket 11 and a second sealing gasket 12 of an annular structure, a first groove is provided at a position corresponding to the edge of the through hole on the partition 104, and a second groove is provided at a position corresponding to the edge of the ring opening on the partition 104. The outer ring portion at one end of the first sealing gasket 11 is embedded in the first groove, and the inner ring portion at the other end is provided with a first card groove; the outer ring portion at one end of the second sealing gasket 12 is embedded in the second groove, and the inner ring portion at the other end is provided with a second card groove. The first card groove and the second card groove together form an annular groove, and the edge portion of the pneumatic metamaterial 2 is fixedly embedded in the annular groove, thereby achieving the sealing of the matching gap between the pneumatic metamaterial 2 and the pressure plate 10 and the partition 104.

[0057] In the specific implementation process, the housing 1 is provided with a plurality of first mounting holes 105 in communication with the upstream chamber for mounting the first pressure sensor 3. The first pressure sensors 3 mounted in each of the first mounting holes 105 have different ranges and precisions, so that the pressure of the upstream chamber can be accurately measured. Similarly, the housing 1 is also provided with a plurality of second mounting holes 106 in communication with the downstream chamber for mounting the second pressure sensor 4. The second pressure sensors 4 mounted in each of the second mounting holes 106 have different ranges and precisions, so that the pressure of the downstream chamber can be accurately measured.

[0058] In the specific implementation process, the air inlet assembly includes an air storage tank 6, a pressure reducing valve and an air source inlet pipe 5, and the air outlet assembly includes an air source outlet pipe 8 and a flow meter 7. One end of the air source inlet pipe 5 is connected to the shell 1 and communicates with the upstream chamber, and the other end is connected to the air storage tank 6. The pressure reducing valve is arranged on the air source inlet pipe 5, that is, the air is supplied to the quantitative measurement experiment of the seepage through the air storage tank 6. One end of the air source outlet pipe 8 is connected to the shell 1 and communicates with the downstream chamber, and the other end extends to the outside. The flow meter 7 is arranged on the air source outlet pipe 8, so as to measure the flow rate of the airflow at the outlet of the downstream chamber.

[0059] In the specific implementation process, the percolation quantitative measurement device also includes a data processor 9, and the first pressure sensor 3 and the second pressure sensor 4 are electrically connected to the data processor 9 respectively, and are used to evaluate the percolation performance of the pneumatic metamaterial 2 according to the first pressure sensor 3, the second pressure sensor 4 and the flow meter 7. Based on this, this embodiment also discloses a pneumatic metamaterial percolation evaluation method. By adopting the above-mentioned percolation quantitative measurement device, the pneumatic metamaterial 2 percolation evaluation method includes the following steps:

[0060] First, the pneumatic metamaterial 2 is fixed on the partition 104 in the base 101 by a fixing assembly, and then the cover plate 102 is installed on the base 101 to ensure the airtightness of the upstream chamber, the downstream chamber and the shell 1 inside and outside, and to form a quantitative permeation measurement device for the pneumatic metamaterial 2;

[0061] Then, after turning on the first pressure sensor 3, the second pressure sensor 4, the flow meter 7 and the data processor 9, the gas storage tank 6 is turned on to inject gas into the upstream chamber. When the reading of the flow meter 7 is stable, the readings of the first pressure sensor 3, the second pressure sensor 4 and the flow meter 7 are recorded, and the readings of the first pressure sensor 3 and the second pressure sensor 4 are subtracted to obtain the current material seepage pressure drop, and a set of corresponding flow meter 7 readings and material seepage pressure drop data is obtained;

[0062] Subsequently, the pressure-building valve is adjusted to control the airflow input from the gas storage bottle to change to different pressures, and the steps of “opening the gas storage tank 6, injecting gas into the upstream chamber, recording the readings of the first pressure sensor 3, the second pressure sensor 4 and the flow meter 7 when the reading of the flow meter 7 is stable, and subtracting the readings of the first pressure sensor 3 and the second pressure sensor 4 to obtain the current material seepage pressure drop, and obtaining a set of corresponding flow meter 7 readings and material seepage pressure drop data” are repeated until multiple sets of corresponding flow meter 7 readings and material seepage pressure drop data are obtained;

[0063] After obtaining multiple sets of corresponding flow meter 7 readings and material seepage pressure drop data, the pressure drop and flow rate relationship curve of the pneumatic metamaterial 2 is fitted with the flow meter 7 readings as the horizontal coordinate and the material seepage pressure drop as the vertical coordinate, for example: Figure 3 As shown;

[0064] Finally, the permeability of the pneumatic metamaterial 2 is calculated based on the pressure drop and flow rate relationship curve, and the permeability performance of the pneumatic metamaterial 2 is evaluated based on the permeability.

[0065] In this embodiment, different permeability calculation methods are selected according to the permeability velocity. Specifically, when the permeability velocity is lower than the threshold, the permeability calculation process is:

[0066]

[0067] in, is the pressure gradient along the seepage direction (i.e. the ordinate of the pressure drop and flow rate relationship curve), is the flow rate of the seepage fluid, is the air viscosity coefficient, is the permeability;

[0068] When the seepage velocity is higher than the threshold, the calculation process of the seepage rate is:

[0069]

[0070] in, is the Forchheimer coefficient, is the permeability.

[0071] For example Figure 3 The figure shows a flow velocity and pressure gradient relationship curve of a pneumatic metamaterial 2 obtained by the evaluation method of this embodiment. It is worth noting that the quantitative percolation measurement device and evaluation method in this embodiment are not limited to the pneumatic metamaterial 2, but can also be applied to other percolation materials.

[0072] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A quantitative measurement device for permeation of pneumatic metamaterials, characterized in that: It comprises an air inlet assembly, an air outlet assembly and a hollow shell, wherein a partition is provided in the shell to separate the internal space of the shell into an upstream chamber and a downstream chamber; The partition is provided with a through hole connecting the upstream chamber and the downstream chamber, and the partition is provided with a fixing component to fix the pneumatic metamaterial to cover the through hole; The air intake assembly is in communication with the upstream chamber, and the housing is provided with a first pressure sensor capable of measuring the pressure in the upstream chamber; The gas outlet assembly is in communication with the downstream chamber, and the housing is provided with a second pressure sensor capable of measuring the pressure in the downstream chamber; The gas outlet component is provided with a flow meter; The fixing assembly includes a pressing plate of an annular structure; The pressing plate is detachably connected to the partition plate by bolts, and the pneumatic metamaterial is clamped between the pressing plate and the partition plate; The through hole is located at one end of the pneumatic metamaterial, and the ring opening of the pressure plate is located at the other end of the pneumatic metamaterial; A sealing assembly is provided between the pneumatic metamaterial, the pressure plate and the partition, and the sealing assembly includes a first sealing gasket and a second sealing gasket of an annular structure; A first groove is provided on the partition at a position corresponding to the edge of the through hole, and a second groove is provided on the partition at a position corresponding to the edge of the ring opening; The outer ring portion at one end of the first sealing gasket is embedded in the first groove, and the inner ring portion at the other end is provided with a first clamping groove; The outer ring portion at one end of the second sealing gasket is embedded in the second groove, and the inner ring portion at the other end is provided with a second clamping groove; The first clamping groove and the second clamping groove form an annular groove, and the edge portion of the pneumatic metamaterial is embedded in the annular groove.

2. The pneumatic metamaterial permeation quantitative measurement device according to claim 1, characterized in that: The housing is provided with a plurality of first mounting holes communicating with the upstream chamber for mounting the first pressure sensors of different precisions and ranges; The shell is provided with a plurality of second mounting holes communicating with the downstream chamber for mounting the second pressure sensors with different precisions and ranges.

3. The pneumatic metamaterial permeation quantitative measurement device according to claim 1, characterized in that: The air intake assembly includes an air storage tank, a pressure reducing valve and an air source inlet pipeline; One end of the gas source inlet pipeline is connected to the shell and communicates with the upstream chamber, and the other end is connected to the gas storage tank. The pressure reducing valve is arranged on the gas source inlet pipeline.

4. The pneumatic metamaterial permeation quantitative measurement device according to claim 1, characterized in that: The gas outlet assembly includes a gas source outlet pipeline and a flow meter; One end of the gas source outlet pipe is connected to the shell and communicates with the downstream chamber, and the other end extends to the outside. The flow meter is arranged on the gas source outlet pipe.

5. The pneumatic metamaterial permeation quantitative measurement device according to any one of claims 1 to 4, characterized in that: The process of the pneumatic metamaterial permeation quantitative measurement device performing permeation evaluation on the pneumatic metamaterial comprises the following steps: Fixing the pneumatic metamaterial in the housing and assembling the pneumatic metamaterial permeation quantitative measurement device; Control the air intake assembly to inject gas into the upstream chamber, record the readings of the first pressure sensor, the second pressure sensor and the flow meter when the flow meter reading is stable, and obtain the current material seepage pressure drop by subtracting the readings of the first pressure sensor and the second pressure sensor; Adjust the pressure of the gas injected into the upstream chamber by the air intake assembly, and when the flow meter reading is stable, record the readings of the first pressure sensor, the second pressure sensor and the flow meter again, and obtain the current material seepage pressure drop, and repeat the operation until several sets of corresponding flow meter readings and material seepage pressure drops are obtained; With the flow meter reading as the horizontal coordinate and the material seepage pressure drop as the vertical coordinate, the pressure drop and flow rate relationship curve of the pneumatic metamaterial is fitted; The permeability of the pneumatic metamaterial is calculated based on the pressure drop and flow rate relationship curve, and the permeability performance of the pneumatic metamaterial is evaluated according to the permeability.

6. The pneumatic metamaterial permeation quantitative measurement device according to claim 5, characterized in that: The permeability of the pneumatic metamaterial is calculated based on the pressure drop and flow relationship curve, specifically: in, is the pressure gradient along the seepage direction, is the flow rate of the seepage fluid, is the air viscosity coefficient, is the permeability.

7. The pneumatic metamaterial permeation quantitative measurement device according to claim 5, characterized in that: The permeability of the pneumatic metamaterial is calculated based on the pressure drop and flow relationship curve, specifically: in, is the pressure gradient along the seepage direction, is the flow rate of the seepage fluid, is the air viscosity coefficient, is the Forchheimer coefficient, is the air gas constant, is the permeability.

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