A powder collection and measurement device that simulates ramjet engine environment back pressure

Abstract

The application discloses a powder collecting and measuring device for simulating the back pressure of a stamping engine environment, and relates to the technical field of screening machines. A working cavity comprises a separation mechanism and a collecting mechanism which are sequentially and sealingly connected from top to bottom. A side wall of the separation mechanism is provided with an inlet, and gas-solid two-phase fluid containing solid particles enters the separation mechanism through the inlet and is centrifugally separated inside. The separation mechanism is provided with a gas outlet for discharging separated gas. The lower end of the separation mechanism is in communication with the collecting mechanism, and separated solid particles fall into the collecting mechanism and are collected. The working cavity is connected with a pressure regulating mechanism, and the pressure regulating mechanism can regulate the pressure inside the working cavity. Therefore, the device can simulate a real back pressure environment and truly reflect the actual powder supply state when the engine is working.

Description

Technical Field

[0001] This invention relates to the field of screening machine technology, and in particular to a powder collection and measurement device that simulates the back pressure of a ramjet engine environment. Background Technology

[0002] A powder ramjet engine is a new type of engine that uses metal powder as fuel. During operation, the powder in the collection device mixes with the fluidizing gas to form a gas-solid two-phase flow, which is then supplied to the combustion chamber. To ensure the stability and reliability of the powder engine in actual operation, a high-precision ground calibration test must be performed on the mass flow rate of the powder supplied by the collection device (i.e., the powder supply pattern) before formal experiments.

[0003] Currently, conventional powder mass flow rate testing devices typically employ open or semi-open collection systems operating at atmospheric pressure for collection and weighing. However, in actual operation, ramjet engines experience back pressure within their combustion chambers (e.g., low back pressure environments). The resistance characteristics of the collection system discharging powder under atmospheric pressure differ significantly from those under actual back pressure, causing the powder mass flow rate curve measured by conventional atmospheric pressure collection devices to fail to accurately reflect the actual powder supply status during engine operation. Furthermore, most existing pressure-sealed collection devices lack dynamic pressure relief and stabilization mechanisms. As fluidizing gas is continuously injected, the internal pressure of the device continuously increases unidirectionally, making it impossible to create a stable simulated back pressure environment. Summary of the Invention

[0004] The purpose of this invention is to provide a powder collection and measurement device that simulates the back pressure of a ramjet engine environment, so as to solve the problems existing in the prior art. It can simulate the real back pressure environment and truly reflect the actual powder supply status when the engine is working.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a powder collection and measurement device for simulating the back pressure of a ramjet engine environment. The device includes a sealed working chamber comprising a separation mechanism and a collection mechanism connected in a sealed manner from top to bottom. The separation mechanism has an inlet on its side wall, through which a gas-solid two-phase fluid containing solid particles enters and undergoes centrifugal separation. The separation mechanism also has an outlet for discharging the separated gas. The lower end of the separation mechanism is connected to the collection mechanism, where the separated solid particles fall and are collected. The working chamber is connected to a pressure regulating mechanism, which adjusts the pressure inside the working chamber.

[0006] In some embodiments, the pressure regulating mechanism includes a detection element, a pressure regulating element, and a controller; the detection end of the detection element extends into the working chamber to collect pressure signals within the working chamber; the controller is connected to both the detection element and the pressure regulating element, and the controller is used to control the operation of the pressure regulating element based on the pressure signals to adjust the pressure inside the working chamber.

[0007] In some embodiments, the controller includes a pressure switch that controls the start and stop of the pressure regulating element.

[0008] In some embodiments, the pressure regulating element includes an automatic vent valve and an inflation valve. The pressure switch is electrically connected to the automatic vent valve. The pressure switch can cause the automatic vent valve to vent when the pressure inside the working chamber is higher than a preset value, so as to maintain the pressure of the working chamber within the target pressure range. The inflation valve is disposed on the separation mechanism and communicates with the outside, and is used to fill the working chamber with gas.

[0009] In some embodiments, the detection element is a pressure sensor, the output of which is electrically connected to pressure gauges mounted on the controller and the separation mechanism, and the pressure gauges are used to display the pressure values ​​inside the working chamber in real time.

[0010] In some embodiments, the separation mechanism is provided with a filter element assembly, which is located above the feed inlet and below the air outlet, and is used to filter the gas rising after centrifugal separation.

[0011] In some embodiments, a weighing device is also included, which is disposed at the bottom of the collecting mechanism and is used to obtain powder weight information within the collecting mechanism.

[0012] In some embodiments, the collecting mechanism is provided with a collecting bucket, the opening of which faces the lower outlet of the separating mechanism, and the bottom of the powder collecting bucket is provided with a weighing device for measuring the weight of the collecting bucket in real time.

[0013] In some embodiments, the weighing device is a weighing sensor.

[0014] In some embodiments, the filter element assembly is a high-pressure resistant filter element.

[0015] The present invention achieves the following technical effects compared to the prior art: This invention, by incorporating a pressure regulating mechanism into a powder collection and measurement device simulating the back pressure of a ramjet engine environment, enables real-time adjustment of the internal pressure within the sealed working chamber. On one hand, this stabilizes the gas pressure environment within the separation mechanism, ensuring that the flow velocity and flow field of the gas-solid two-phase fluid remain constant during centrifugal separation. This effectively improves the separation efficiency and accuracy of solid particles and gas, avoiding problems such as incomplete particle separation and gas entrainment of particles due to pressure fluctuations within the chamber. On the other hand, the internal pressure difference can be flexibly adjusted according to different test conditions, adapting to various test scenarios and expanding the device's applicability. Simultaneously, the stable internal pressure ensures that the solid particles fall smoothly and orderly to the collection mechanism, reducing particle dust and secondary suspension, ultimately improving the accuracy and repeatability of solid particle mass flow rate detection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a powder collection and measurement device for simulating the back pressure of a ramjet engine environment in one embodiment of the present invention. Figure 2 This is an exploded view of a powder collection and measurement device for simulating the back pressure of a ramjet engine environment in one embodiment of the example. Figure 3 This is an exploded view of a powder collection and measurement device for simulating the back pressure of a ramjet engine environment in one embodiment of the present invention. Figure 4 This is a front view of a powder collection and measurement device simulating the back pressure of a ramjet engine environment in one embodiment of the present invention; Figure 5 This is a cross-sectional view of a powder collection and measurement device for simulating the back pressure of a ramjet engine environment in one embodiment of the present invention. Figure 6 This is a front sectional view of a powder collection and measurement device simulating the back pressure of a ramjet engine environment in one embodiment.

[0018] Wherein: 1-Collection mechanism; 2-Separation mechanism; 3-Cover; 4-Filter element assembly; 5-Collection bucket; 6-Weighing device; 7-Manual exhaust valve; 8-Inflation valve; 9-Automatic exhaust valve; 10-Pressure gauge; 11-Pressure switch; 12-Pressure sensor; 13-Feed inlet. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] This embodiment provides a powder collection and measurement device that simulates the back pressure of a ramjet engine environment, such as... Figure 1-6 As shown, the sealed working chamber includes a separation mechanism 2 and a collection mechanism 1 connected in a sealed manner from top to bottom. The side wall of the separation mechanism 2 has an inlet 13, through which the gas-solid two-phase fluid containing solid particles enters and undergoes centrifugal separation. The separation mechanism 2 also has an outlet for discharging the separated gas. The lower end of the separation mechanism 2 is connected to the collection mechanism 1, where the separated solid particles fall and are collected. The working chamber is connected to a pressure regulating mechanism, which adjusts the pressure inside the working chamber. In this embodiment, the pressure inside the sealed working chamber can be adjusted in real time by setting a pressure regulating mechanism. On the one hand, this stabilizes the gas pressure environment inside the separation mechanism 2, ensuring that the flow rate and flow field of the gas-solid two-phase fluid remain constant during centrifugal separation, effectively improving the separation efficiency and accuracy of solid particles and gas, and avoiding problems such as incomplete particle separation and gas carrying particles out due to pressure fluctuations within the chamber. On the other hand, the internal pressure difference of the chamber can be flexibly adjusted according to different test conditions, adapting to various test conditions and expanding the applicability of the device. Meanwhile, stable internal pressure ensures that the solid particles fall smoothly and orderly to the collection mechanism, reducing particle dust and secondary suspension, and ultimately improving the detection accuracy and data repeatability of solid particle mass flow rate.

[0022] In some embodiments of this example, the pressure regulating mechanism includes a detection element, a pressure regulating element, and a controller. The detection end of the detection element extends into the working chamber to collect pressure signals within the working chamber. The controller is connected to both the detection element and the pressure regulating element, and is used to control the action of the pressure regulating element according to the pressure signals to adjust the pressure inside the working chamber. The pressure regulating mechanism adopts a control structure in which the detection element, the pressure regulating element, and the controller work together to collect pressure data inside the working chamber in real time, and accurately control the start / stop and action range of the pressure regulating element according to the actual pressure signals, thereby realizing dynamic and automated adjustment of the pressure inside the working chamber.

[0023] In some embodiments of this example, the controller includes a pressure switch 11, which can control the start and stop of the pressure regulating element. Using the pressure switch 11 for control is simple in structure, low in cost, and has a low failure rate. It can directly control the start and stop of the pressure regulating element based on the internal pressure threshold of the cavity, and quickly complete the pressure on / off adjustment. This can not only maintain the pressure stability in the working cavity and ensure the smooth operation of gas-solid separation and particle sedimentation, but also simplify the control logic, reduce the difficulty of equipment operation and maintenance, and improve the reliability of the device operation.

[0024] In some embodiments of this example, the pressure regulating element includes an automatic exhaust valve 9 and an inflation valve 8. The pressure switch 11 is electrically connected to the automatic exhaust valve 9. When the pressure inside the working chamber is higher than a preset value, the pressure switch 11 can cause the automatic exhaust valve 9 to vent, so as to maintain the pressure of the working chamber within the target pressure range. The inflation valve 8 is installed on the separation mechanism 2 and communicates with the outside, and is used to fill the working chamber with gas. Through the pressure relief cooperation of the inflation valve 8 and the automatic exhaust valve 9, combined with the linkage control of the pressure switch 11, the gas pressure of the working chamber can be adjusted: when the pressure inside the working chamber is higher than the set threshold, the pressure switch 11 triggers the automatic exhaust valve 9 to release pressure, thereby stabilizing the pressure of the working chamber within the target range. The overall structure is reasonably laid out and responds quickly, which can offset the pressure fluctuations caused by gas-solid flow and particle sedimentation in real time, ensuring the continuous stability of centrifugal separation and particle collection, and improving the accuracy of mass flow rate testing. At the same time, the valve matching control logic is simple, and the assembly and maintenance are convenient, taking into account both the reliability of regulation and the practicality of the equipment. The automatic exhaust valve 9 is equipped with a throttle valve, and the exhaust channel diameter is controlled by a manual knob to control the exhaust flow rate, preventing the automatic exhaust gas flow rate from being too large and causing insufficient pressure. It also includes a manual exhaust valve 7, which is used to manually release the internal pressure of the device after the test or in case of emergency.

[0025] In some embodiments of this example, the detection element is a pressure sensor 12. The output terminal of the pressure sensor 12 is electrically connected to the pressure gauge 10 installed on the controller and the separation mechanism 2. The pressure gauge 10 is used to display the pressure value in the working chamber in real time. The pressure sensor 12 can accurately collect the pressure signal in the working chamber, providing data support for the controller to realize automatic pressure control. On the other hand, it synchronously transmits the pressure value to the pressure gauge 10, intuitively displaying the real-time pressure status, which is convenient for operators to monitor and manually verify the working conditions. The combination of the two has both automatic control and visual monitoring functions. The pressure data is accurately collected and timely feedback is provided, which can not only ensure the stability of pressure regulation, but also facilitate the observation of the test process, parameter recording and anomaly troubleshooting, further improving the convenience and reliability of the test work.

[0026] In some embodiments of this example, the device has two pressure control modes, which can be flexibly selected according to the application scenario. The first is an open-loop control mode, in which the pressure switch 11 directly controls the pressure regulating components such as the exhaust valve. The pressure switch 11 triggers the start and stop of the pressure regulating components according to the preset pressure threshold inside the cavity. This method has a simple structure, low cost, low failure rate, and simple control logic. It can quickly complete the pressure on and off adjustment, stabilize the pressure inside the cavity and the gas-solid separation and particle sedimentation conditions, and make the equipment easier to maintain and more reliable in operation. The second is a closed-loop control mode, which adopts a combination of pressure sensor 12 and external dedicated controller. The pressure sensor 12 collects the pressure signal inside the cavity in real time and feeds it back to the controller. The controller dynamically adjusts the exhaust valve according to the difference between the measured pressure and the set value to achieve precise and continuous pressure control.

[0027] In some embodiments of this example, the separation mechanism 2 is equipped with a filter element assembly 4, which is positioned above the feed inlet 13 and below the air outlet, and is used to filter the rising gas after centrifugal separation. The filter element assembly 4, positioned above the feed inlet 13 and below the air outlet, can perform secondary filtration of the rising gas after centrifugal separation, effectively intercepting fine solid particles carried in the airflow, preventing fine particles from being discharged from the air outlet with the gas, and reducing material loss. Simultaneously, it improves the cleanliness of the exhaust gas, ensures a stable flow field inside the cavity, prevents secondary suspension of particles, and thus improves the gas-solid separation effect and the accuracy of the solid particle mass flow rate test.

[0028] In some embodiments of this example, the powder collection and measurement device simulating the back pressure of a ramjet engine environment also includes a weighing device 6. The weighing device 6 is located at the bottom of the collection mechanism 1 and is used to obtain the powder weight information within the collection mechanism 1. The weighing device 6 is directly located at the bottom of the collection mechanism 1, which can collect the weight data of the collected solid particles in real time and accurately without the need for additional material transfer, thus avoiding measurement errors caused by particle spillage and loss. Combined with the test duration, the mass flow rate of solid particles can be quickly calculated, simplifying the test process, improving detection efficiency, and ensuring continuous and stable weighing data, thereby further improving the accuracy and reliability of the mass flow rate test results.

[0029] In some embodiments of this example, a collection bucket 5 is provided inside the collection mechanism. The opening of the collection bucket 5 is directly opposite the lower outlet of the separation mechanism 2. A weighing device 6 is provided at the bottom of the powder collection bucket 5. The weighing device 6 is used to measure the weight of the collection bucket 5 in real time. Since the opening of the collection bucket 5 is directly opposite the lower outlet of the separation mechanism 2, it can ensure that all the separated solid particles fall into the collection bucket 5, reducing material loss and measurement deviation caused by particle splashing and scattering. The weighing device 6 is integrated into the bottom of the collection bucket 5, which can continuously weigh the collection bucket 5 and the total weight of the particles inside the collection bucket 5 in real time. There is no need to transfer materials, simplifying the operation process. Based on the real-time weight data, the particle collection amount per unit time can be accurately calculated, effectively improving the accuracy, continuity and work efficiency of mass flow rate testing.

[0030] In some embodiments of this example, the weighing device is a weighing sensor; using a weighing sensor as the weighing device provides high detection accuracy, fast response speed, and a simple and easy-to-integrate structure.

[0031] This embodiment presents a test method for a powder collection and measurement device based on a simulated ramjet engine back pressure environment, including the following steps: Preparation phase: Before the experiment begins, high-pressure inert gas can be introduced into the device through the inflation valve 8 to make the internal pressure reach the preset pressure value (i.e., the simulated back pressure value of the combustion chamber), and confirmed by the pressure gauge 10 and the pressure sensor 12.

[0032] Testing phase: The solid particle mass flow rate testing device is started, and the gas-powder two-phase flow continuously rushes into the device tangentially. As the fluidizing gas continues to enter, the internal pressure of the device shows an upward trend.

[0033] Pressure stabilization and exhaust phase: When pressure switch 11 detects that the pressure inside the device is higher than the set simulated back pressure upper limit, it immediately outputs an electrical signal to control the opening of automatic exhaust valve 9 for exhaust; when the pressure drops back to the set range, automatic exhaust valve 9 closes. This process repeats, and the internal pressure of the device is always maintained within the set back pressure range, thus achieving a realistic simulation of the environmental pressure in the engine combustion chamber.

[0034] Meanwhile, the filter element assembly 4 is clamped at the top of the separation mechanism 2 and at the front flange of the exhaust pipe. The dust-laden gas that flows upward after cyclone separation must pass through the filter element assembly 4 before being discharged from the automatic exhaust valve 9. The filter element assembly 4 performs secondary interception of the residual ultrafine powder to ensure that the discharged gas is clean and protects the exhaust valve from powder jamming.

[0035] In addition, the separation mechanism 2 has a cover 3, and the pressure regulating elements are all set on the cover 3. The cover 3 is also equipped with a manual vent 7 so that the operator can safely and quickly release the residual pressure in the device after the experiment is unexpectedly interrupted or the test is completely finished, so as to facilitate the subsequent opening of the cover to clean the powder in the collection bucket 5.

[0036] Through the above structure and process, this invention realizes three major functions: dynamic back pressure simulation, efficient gas-solid separation, and real-time online weighing of powder mass flow rate, providing an extremely reliable test platform for ground calibration of solid particle mass flow rate testing.

[0037] Dynamic calibration test for the mass flow rate of conventional solid particles: The specific operational procedure for calibrating the mass flow rate of metal powders (such as aluminum powder or magnesium powder) using the above-mentioned device is described. The simulated back pressure requirement for the solid particle mass flow rate testing device is set to 0.55MPa~0.6MPa.

[0038] The steps are as follows: Sealing and Initialization: Place the empty collection tank 5 on the weighing device 6, and secure the collection mechanism 1, separation mechanism 2, and upper cover 3 of the separation mechanism with flanges and sealing rings. The operator fills the device with high-pressure nitrogen through the pre-filling valve 8. When the pressure gauge 10 and pressure sensor 12 show that the internal pressure reaches 0.57 MPa, close the filling valve 8. At this time, the initial simulated back pressure environment is established inside the device.

[0039] Set control thresholds: Set the upper limit of the trigger threshold of pressure switch 11 to 0.6MPa and the lower limit (reset value) to 0.55MPa. At the same time, start the data acquisition terminal of weighing device 6 to perform zeroing and real-time recording at a sampling frequency of 100Hz.

[0040] Solid Particle Injection and Dynamic Pressure Stabilization: Upon activation of the external powder supply system, fluidizing gas (gas-powder two-phase flow) carrying metal powder is tangentially injected at high speed into the separation mechanism 2 from the inlet 13. The powder is separated by a cyclone separator and falls into the collection tank 5. The internal pressure rises rapidly with the injection of fluidizing gas. When the pressure sensor 12 detects that the cylinder pressure reaches 0.6 MPa, the pressure switch 11 is triggered, and the electromagnetic proportional valve connected to the automatic exhaust valve 9 automatically opens to exhaust gas. Because the exhaust volume is greater than the intake volume, the pressure in the working chamber begins to decrease. When it drops to 0.55 MPa, the pressure switch 11 disconnects, and the automatic exhaust valve 9 closes. Throughout the powder supply test, the device automatically repeats the above dynamic adjustment process, stabilizing the back pressure in the collection tank between 0.55 MPa and 0.6 MPa, realistically simulating the actual working conditions of an engine combustion chamber.

[0041] Data acquisition: After the test, extract the curve of weight change over time recorded by weighing device 6, and take the derivative of the curve to obtain the true mass flow rate of the powder supply system under a back pressure of 0.55~0.6MPa.

[0042] High back pressure testing and safe release of micron-sized metal powders Based on the testing, further optimizations were made to meet the high back pressure testing requirements of micron-sized ultrafine metal powders commonly used in the aerospace field. In this type of test, ultrafine powders are easily lifted by the swirling airflow. In this embodiment, the internal filter element assembly 4 was specially configured, using a high-pressure resistant filter element with a filtration accuracy of 5μm.

[0043] During the test, after cyclone separation, most of the heavier powders fell directly into the collection bucket 5; the remaining suspended fine powders were precisely intercepted by the 5μm precision filter element 4 when they reached the top of the separation mechanism 2 with the central rising airflow, ensuring that the gas discharged from the automatic exhaust valve 9 was pure gas. This protected the precision pressure switch 11 and exhaust valve at the top from dust jamming and also prevented ultrafine metal powder from being discharged into the atmosphere, causing environmental pollution or the risk of deflagration.

[0044] After the test, high-pressure gas remains in the device. To ensure the safety of the operators, before loosening the connecting flange, the operators must slowly open the manual exhaust valve 7 to allow the residual high-pressure gas in the device to be released gradually to atmospheric pressure. Only after the pressure gauge 10 indicates zero can the collection mechanism 1 be disassembled and the collection bucket 5 be taken out for final powder recovery.

[0045] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A powder collection and measurement device simulating the back pressure of a ramjet engine environment, comprising a sealed working chamber, characterized in that: The working chamber includes a separation mechanism and a collection mechanism that are sealed and connected sequentially from top to bottom; The separation mechanism has a feed inlet on its side wall, through which a gas-solid two-phase fluid containing solid particles enters the separation mechanism and is centrifugally separated inside. The separation mechanism also has an outlet for discharging the separated gas. The lower end of the separation mechanism is connected to the collection mechanism, where the separated solid particles fall and are collected. The working chamber is connected to a pressure regulating mechanism, which can adjust the pressure inside the working chamber.

2. The powder collection and measurement device for simulating the back pressure of a ramjet engine environment according to claim 1, characterized in that: The pressure regulating mechanism includes a detection element, a pressure regulating element, and a controller; the detection end of the detection element extends into the working chamber to collect pressure signals within the working chamber; the controller is connected to both the detection element and the pressure regulating element, and the controller is used to control the operation of the pressure regulating element based on the pressure signals to adjust the pressure inside the working chamber.

3. The powder collection and measurement device for simulating the back pressure of a ramjet engine environment according to claim 2, characterized in that: The controller includes a pressure switch, which can control the start and stop of the pressure regulating element.

4. The powder collection and measurement device for simulating the back pressure of a ramjet engine environment according to claim 3, characterized in that: The pressure regulating element includes an automatic vent valve and an inflation valve. The pressure switch is electrically connected to the automatic vent valve. The pressure switch can cause the automatic vent valve to vent when the pressure inside the working chamber is higher than a preset value, so as to maintain the pressure of the working chamber within the target pressure range. The inflation valve is installed on the separation mechanism and communicates with the outside, and is used to fill the working chamber with gas.

5. The powder collection and measurement device for simulating the back pressure of a ramjet engine environment according to claim 2, characterized in that: The detection element is a pressure sensor. The output terminal of the pressure sensor is electrically connected to the pressure gauges installed on the controller and the separation mechanism. The pressure gauges are used to display the pressure value inside the working chamber in real time.

6. The powder collection and measurement device for simulating the back pressure of a ramjet engine environment according to claim 1, characterized in that: The separation mechanism is equipped with a filter element assembly, which is located above the feed inlet and below the air outlet, and is used to filter the gas rising after centrifugal separation.

7. The powder collection and measurement device for simulating the back pressure of a ramjet engine environment according to claim 1, characterized in that: It also includes a weighing device, which is located at the bottom of the collection mechanism and is used to obtain the powder weight information in the collection mechanism.

8. The powder collection and measurement device for simulating the back pressure of a ramjet engine environment according to claim 7, characterized in that: The collection mechanism is equipped with a collection bucket, the opening of which faces the lower outlet of the separation mechanism. The bottom of the powder collection bucket is equipped with a weighing device, which is used to measure the weight of the collection bucket in real time.

9. The powder collection and measurement device for simulating the back pressure of a ramjet engine environment according to claim 7, characterized in that: The weighing device is a weighing sensor.

10. The powder collection and measurement device for simulating the back pressure of a ramjet engine environment according to claim 6, characterized in that: The filter element assembly is a high-pressure resistant filter element.

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