Measuring system for acquiring pressure and temperature data of internal flow field of airflow channel

Abstract

The invention discloses a measuring system for acquiring pressure and temperature data of an internal flow field of an airflow channel, which comprises a total temperature and total pressure measuring device arranged on the side wall of a to-be-monitored pipeline and an upper computer in communication connection with the total temperature and total pressure measuring device, and is characterized in that the total temperature and total pressure measuring device comprises a measuring device body; the total pressure sensor and the total temperature sensor are arranged on the measuring device body, and a plurality of pressure measurement acquisition holes communicated with the mounting hole I and temperature measurement acquisition through holes communicated with the mounting hole II are formed in the windward side of the measuring device body in the extension direction; the positions of the pressure measurement collecting holes take the central axis of the airflow channel as the original point and are arranged according to the equal ring area principle. According to the measurement system for obtaining the pressure and temperature data of the flow field in the airflow channel, the positions of the pressure measurement collection holes are set according to the equal ring area principle, the positions of the pressure measurement collection holes are matched with the space area of the cross section in the airflow channel, and the accuracy of distortion experiment test data can be improved.

Description

Technical Field

[0001] The present invention relates to a data detection device used in a flow field. More specifically, the present invention relates to a measurement system for obtaining pressure and temperature data of the internal flow field of an air flow channel. Background Art

[0002] In the fields of aerodynamic wind tunnel tests, aviation, and air flow, the intake air flow channel distortion test is an important means to test the stability of experimental equipment behind the air flow channel and is also an essential key content in the research on the compatibility of the intake channel. Through air flow channel or wind tunnel tests, pressure and temperature data required for aerodynamic stability tests can be obtained, the critical distortion index and distortion sensitivity coefficient of experimental equipment behind the air flow channel at different rotational speeds can be determined, the influence of total pressure and total temperature distortion coefficients on the performance of compression components or equipment behind the air flow channel can be obtained, the conclusions of stability tests can be verified, and the mathematical model can be continuously corrected using test results, so as to ensure that the developed equipment has a stability margin that meets safety requirements.

[0003] In traditional wind tunnel tests and air flow channels, measurement devices are used to collect flow field parameters in wind tunnel tests and air flow channels to obtain pressure and temperature data of the internal flow field of the air flow channel. The measurement devices usually can only measure pressure data or temperature data. When measuring, multiple measurement devices need to be arranged to separately obtain the pressure and temperature data of the internal flow field of the air flow channel.

[0004] Of course, there are also measurement devices that can measure pressure and temperature data simultaneously. For example, the invention patent with the application number 201710201151.7 discloses a combined dynamic probe for measuring the distortion flow field at the inlet of a turbomachine. The probe includes a probe head and a strut. The probe head includes a temperature sensor mounting hole, a pressure hole, a hot wire bracket, and a hot wire, and can simultaneously measure dynamic parameters such as the total pressure, total temperature, velocity magnitude, direction, and velocity pulsation of the incoming flow, and is suitable for measuring the total temperature, total pressure, and turbulence intensity of the distortion flow field at the inlet of a turbomachine. However, this device only has one pressure acquisition hole and can only measure the total pressure at a single position, and the accuracy of pressure data measurement in the distortion flow field is limited, and there is a problem that accurate acquisition of distortion experiment test data cannot be achieved. Summary of the Invention

[0005] An object of the present invention is to solve at least the above problems and / or defects and provide at least the advantages described later.

[0006] To achieve these objects and other advantages of the present invention, a measurement system for obtaining the internal flow field pressure and temperature data of an air flow channel is provided, including: a total temperature and total pressure measurement device arranged on the side wall of the pipeline to be monitored, and a host computer communicatively connected to the total temperature and total pressure measurement device. The total temperature and total pressure measurement device includes: a measurement device body, a total pressure sensor arranged in mounting hole Ⅰ of the measurement device body, and a total temperature sensor arranged in mounting hole Ⅱ of the measurement device body. On the windward surface of the measurement device body, a plurality of pressure measurement acquisition holes communicating with mounting hole Ⅰ and a temperature measurement acquisition through hole communicating with mounting hole Ⅱ are provided along the extending direction;

[0007] The positions of the pressure measurement acquisition holes are set based on the principle of equal annulus area with the central axis of the air flow channel as the origin, and their distribution position formula is:

[0008]

[0009] In the formula: D is the diameter of the air flow channel, i is the serial number of the pressure measurement acquisition hole from near to far from the central axis of the air flow channel, ri is the distance of the i-th pressure measurement acquisition hole from the central axis of the air flow channel, and n is the total number of pressure measurement acquisition holes.

[0010] Preferably, the temperature measurement acquisition through hole is configured to be three, the distance between two adjacent temperature measurement acquisition through holes is 2.5 times its aperture, and the second temperature measurement acquisition through hole is located on the central axis of the air flow channel.

[0011] Preferably, the width H of the windward surface of the measurement device body is not less than 16 mm;

[0012] The distance between mounting hole Ⅰ and the windward surface is 3 to 5 times H;

[0013] The distance between mounting hole Ⅱ and the windward surface is 6 to 8 times H, and the distance from the leeward surface is 3 to 5 times H.

[0014] Preferably, the distance between the pressure measurement acquisition hole and the central axis of the air flow channel is greater than the distance between the temperature measurement acquisition through hole and the central axis of the air flow channel, and the distance between the pressure measurement acquisition hole closest to the inner wall surface of the air flow channel and the inner wall surface of the air flow channel is 6 - 9 mm.

[0015] Preferably, the windward surface and the leeward surface of the measurement device body are configured as arc surfaces so that its cross-section is configured as a runway shape.

[0016] Preferably, it further includes: a mounting seat fixedly arranged through the side wall of the pipeline to be monitored;

[0017] The measurement device body is installed on the mounting seat, and a sealing ring is provided between them.

[0018] Preferably, when the diameter of the air flow channel is greater than 800 mm, one end of the measurement device body is fixed to the mounting seat, and the other end extends 5 mm into the inner wall on the opposite side of the pipeline to be monitored.

[0019] Preferably, it further includes: based on the total temperature and total pressure measurement device, a plurality of pressure measurement devices evenly arranged in a circumferential distribution are provided on the side wall of the pipeline to be monitored;

[0020] The pressure measurement device does not pass through the central axis of the air flow channel, and the position of its pressure measurement acquisition hole is the same as that of the measurement device body.

[0021] The present invention has at least the following beneficial effects: By setting the position of the pressure measurement acquisition hole according to the equal annulus area principle, the intake distortion pressure data in the circular air flow channel is tested. Compared with only setting one pressure measurement acquisition hole or arranging the pressure measurement acquisition holes at equal intervals, the position of the pressure measurement acquisition hole of the present invention is adapted to the spatial area of the inner cross-section of the air flow channel, so that the tested pressure measurement acquisition holes are in a uniform distribution state in terms of area, and the accuracy of the distortion experiment test data can be improved.

[0022] Other advantages, objectives and features of the present invention will be partially reflected by the following description, and partially will be understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an installation cross-sectional view of a measurement system for obtaining the internal flow field pressure and temperature data of an air flow channel in an embodiment of the present invention;

[0024] Figure 2 It is a schematic structural diagram of a measurement system for obtaining the internal flow field pressure and temperature data of an air flow channel in an embodiment of the present invention;

[0025] Figure 3 It is a cross-sectional view of a measurement system for obtaining the internal flow field pressure and temperature data of an air flow channel in an embodiment of the present invention;

[0026] Figure 4 It is a cross-sectional view of the measurement device body of a measurement system for obtaining the internal flow field pressure and temperature data of an air flow channel in an embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the distribution scheme of the total temperature and total pressure measurement system in another embodiment of the present invention.

[0028] Reference numerals in the drawings: 1. Measurement device body, 11. Mounting hole Ⅰ, 12. Mounting hole Ⅱ, 13. Pressure measurement acquisition hole, 14. Temperature measurement acquisition through hole, 15. Windward surface, 16. Leeward surface, 17. Sealing ring installation groove, 2. Mounting seat, 3. Total pressure sensor, 4. Total temperature sensor, 5. Pipeline to be monitored, 6. Pressure measurement device. Detailed Implementation Manner

[0029] The following further describes the present invention in detail with reference to the accompanying drawings, so that those skilled in the art can implement it according to the text of the specification.

[0030] It should be understood that terms such as "having", "comprising", and "including" used herein do not preclude the presence or addition of one or more other elements or combinations thereof.

[0031] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, terms such as "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] Figures 1-4 An implementation form of a measurement system for obtaining the internal flow field pressure and temperature data of an air flow channel according to the present invention is shown, including: a total temperature and total pressure measurement device arranged on the side wall of the pipeline 5 to be monitored, and a host computer communicatively connected to the total temperature and total pressure measurement device. The total temperature and total pressure measurement device includes: a measurement device body 1, a total pressure sensor 3 arranged in the mounting hole I 11 of the measurement device body 1, and a total temperature sensor 4 arranged in the mounting hole II 12 of the measurement device body 1. A plurality of pressure measurement and acquisition holes 13 communicating with the mounting hole I 11 and a temperature measurement and acquisition through hole 14 communicating with the mounting hole II 12 are arranged along the extending direction on the windward surface 15 of the measurement device body 1;

[0034] The positions of the pressure measurement and acquisition holes 13 are set with the central axis of the air flow channel as the origin according to the principle of equal ring area, and their distribution position formula is:

[0035]

[0036] Where: D is the diameter of the air flow channel, i is the serial number of the pressure measurement and acquisition hole 13 from near to far from the central axis of the air flow channel, ri is the distance between the i-th pressure measurement and acquisition hole 13 and the central axis of the air flow channel, and n is the total number of pressure measurement and acquisition holes 13.

[0037] The position of the pressure measurement and acquisition hole 13 is adapted to the spatial area of the inner cross-section of the air flow channel, so that the test pressure measurement and acquisition holes 13 are evenly distributed with respect to the area, which can improve the accuracy of the distortion experiment test data.

[0038] Among them, the total pressure sensor 3 is a specially customized ceramic pressure sensor, and the total temperature sensor 4 is a specially customized ceramic temperature sensor, which can adapt to the complex air flow channel environment and improve the measurement accuracy and stability.

[0039] The temperature measurement and acquisition through holes 14 are configured to be three, the distance between two adjacent temperature measurement and acquisition through holes 14 is 2.5 times its aperture, and the second temperature measurement and acquisition through hole 14 is located on the central axis of the air flow channel. It is mainly used to obtain the temperature data of the internal flow field of the air flow channel. Precise design of the position of the temperature measurement and acquisition through holes 14 can ensure accurate and reliable data acquisition.

[0040] The diameter of the sensor installation hole is 3.2 mm, the diameter of the pressure measurement and acquisition hole 13 is 0.5 mm, and the diameter of the temperature measurement and acquisition through hole 14 is 3 mm. The diameter of the sensor detection needle arranged in the sensor installation hole is 3 mm, which is adapted to it.

[0041] The width H of the windward surface 15 of the measurement device body 1 is not less than 16 mm;

[0042] The distance between the installation hole I 11 and the windward surface 15 is 3 to 5 times of H;

[0043] The distance between the installation hole II 12 and the windward surface 15 is 6 to 8 times of H, and the distance from the leeward surface 16 is 3 to 5 times of H. To ensure the stiffness of the measurement device body 1.

[0044] The distances between the pressure measurement and acquisition holes 13 and the central axis of the air flow channel are all greater than the distances between the temperature measurement and acquisition through holes 14 and the central axis of the air flow channel, and the distance between the pressure measurement and acquisition hole 13 closest to the inner wall surface of the air flow channel and the inner wall surface of the air flow channel is 6 - 9 mm. To avoid interference between the pressure measurement and acquisition holes 13, the temperature measurement and acquisition through holes 14 and the inner wall of the air flow channel, ensure that the number and position of the pressure measurement and acquisition holes 13 are set reasonably, and achieve the expected distortion data acquisition effect.

[0045] The cross-section of the measurement device body 1 is configured as a runway shape, and its windward surface 15 and leeward surface 16 are configured as arc surfaces. To improve the stiffness of the device in the air flow channel and reduce the influence on the channel blockage degree while improving the stiffness.

[0046] It further includes: a mounting base 2 embedded and fixed on the side wall of the air flow channel;

[0047] The main body 1 of the measuring device is mounted on the mounting base 2, and a sealing ring is provided between the two. The mounting base 2 of the measuring device is welded to the pipeline to be monitored. The main body 1 of the measuring device is mounted on the mounting base 2, and a sealing ring mounting groove 17 is provided on the surface where it cooperates with the mounting base 2, and is sealed by setting a sealing ring. This mounting method can better ensure the firmness and sealing performance of the device installation, and reduce the interference of external factors on the measurement.

[0048] The material of the device is configured as: 06Cr19Ni10 or 06Cr17Ni12Mo2. This ensures the corrosion resistance and mechanical properties of the measuring device in the air flow channel environment.

[0049] In traditional wind tunnel tests and air flow channels, the measuring device can only measure pressure data or multiple measuring devices need to be circumferentially arranged. The measuring device cannot pass through the central axis of the channel, or the pressure measuring holes are arranged at equal distances. Even due to design defects of the measuring device, the stiffness of the measuring device is insufficient. This process not only lacks the accuracy of distortion experiment test data, but also, especially in the measurement of the internal flow field, the influence of the manufacturing accuracy of the measuring device on the flow channel blockage degree needs to be considered. This device sets the position of the pressure measurement and acquisition hole 13 according to the equal ring area principle to test the intake distortion pressure data in the circular air flow channel. Compared with only setting one pressure measurement and acquisition hole 13 or arranging the pressure measurement and acquisition holes 13 at equal distances, the position of this pressure measurement and acquisition hole 13 adapts to the spatial area of the cross-section in the air flow channel, making the tested pressure measurement and acquisition holes 13 evenly distributed with respect to the area, which can improve the accuracy of the distortion experiment test data; the cross-section of the main body 1 of the measuring device is configured as a runway shape, and its windward surface 15 and leeward surface 16 are configured as arc surfaces, which can improve the stiffness of the device in the air flow channel and reduce the influence on the flow channel blockage degree while increasing the stiffness.

[0050] A single total temperature and total pressure measuring device can be used to collect the distortion experiment test data of the air flow channel with a diameter of 300 - 800 mm. For the collection of the distortion experiment test data of the air flow channel with a diameter greater than 800 mm, seven pressure measuring devices 6 can be cooperated to be evenly arranged around the side wall in the pipeline to be monitored for measurement, such as Figure 5 .

[0051] The pressure measuring device 6 does not pass through the central axis of the air flow channel, and the positions of its total pressure sensor 3 and pressure measurement and acquisition hole 13 are the same as those of the main body 1 of the measuring device to ensure the accuracy of detection.

[0052] In another example, when the diameter of the air flow channel is greater than 800 mm, one end of the main body 1 of the measuring device is fixed to the mounting seat 2, and the other end extends 5 mm into the inner wall on the opposite side of the pipeline 5 to be monitored (a through hole can be opened at this place, and after the measuring device is installed, this place can be welded and sealed) so as to ensure the stable installation of the device in the pipeline 5 to be monitored and improve the stability and sealing performance of the device installation.

[0053] The above solution is only an illustration of a preferred example, but is not limited thereto. When implementing the present invention, appropriate substitutions and / or modifications can be made according to the needs of users.

[0054] The number of devices and the processing scale described here are used to simplify the description of the present invention. The application, modification and variation of the present invention are obvious to those skilled in the art.

[0055] Although the embodiments of the present invention have been disclosed as above, it is not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples described herein.

Claims

1. A measurement system for obtaining flow field pressure and temperature data inside an air flow channel, comprising: A total temperature and total pressure measuring device is arranged on the side wall of the pipeline to be monitored, and a host computer connected to the total temperature and total pressure measuring device in communication, wherein the total temperature and total pressure measuring device comprises: a measuring device body, a total pressure sensor arranged in the mounting hole I of the measuring device body, and a total temperature sensor arranged in the mounting hole II of the measuring device body, characterized in that a plurality of pressure measurement and collection holes connected to the mounting hole I and a temperature measurement and collection through hole connected to the mounting hole II are provided on the windward surface of the measuring device body along the extension direction; The position of the pressure measurement and collection hole is set based on the principle of equal annular area, with the central axis of the airflow channel as the origin. The distribution position formula is: Where: D is the diameter of the airflow channel, i is the number of the pressure measurement and collection holes from near to far from the central axis of the airflow channel, ri is the distance from the i-th pressure measurement and collection hole to the central axis of the airflow channel, and n is the total number of pressure measurement and collection holes.

2. The measuring system for obtaining the flow field pressure and temperature data inside the air flow channel according to claim 1, characterized in that: The temperature measurement and collection through holes are configured in three numbers, the distance between two adjacent temperature measurement and collection through holes is 2.5 times of their apertures, and the second temperature measurement and collection through hole is located on the central axis of the airflow channel.

3. The measuring system for obtaining flow field pressure and temperature data inside an air flow channel according to claim 1, characterized in that: The windward width H of the measuring device body is not less than 16 mm; The distance between the mounting hole I and the windward surface is 3 to 5 times of H; The distance between the mounting hole II and the windward side is 6 to 8 times of H, and the distance between the mounting hole II and the leeward side is 3 to 5 times of H.

4. The measuring system for obtaining flow field pressure and temperature data inside an air flow channel according to claim 1, characterized in that: The distance between the pressure measurement and collection hole and the central axis of the airflow channel is greater than the distance between the temperature measurement and collection through hole and the central axis of the airflow channel, and the distance between the pressure measurement and collection hole closest to the inner wall of the airflow channel and the inner wall of the airflow channel is 6 to 9 mm.

5. The measuring system for obtaining flow field pressure and temperature data inside an air flow channel according to claim 1, characterized in that: The windward surface and the leeward surface of the measuring device body are configured as arc surfaces, so that the cross section thereof is configured as a runway shape.

6. The measuring system for obtaining flow field pressure and temperature data inside an air flow channel according to claim 1, characterized in that: Also includes: A mounting base is installed and fixed on the side wall of the pipeline to be monitored; The measuring device body is installed on the mounting seat, and a sealing ring is arranged between the two.

7. The measuring system for obtaining flow field pressure and temperature data inside an air flow channel according to claim 6, characterized in that: When the diameter of the air flow channel is greater than 800 mm, one end of the measuring device body is fixed to the mounting seat, and the other end extends into the inner wall of the opposite side of the pipeline to be monitored by 5 mm.

8. The measuring system for obtaining flow field pressure and temperature data inside an air flow channel according to claim 1, characterized in that: Also includes: Taking the total temperature and total pressure measuring device as a reference, multiple pressure measuring devices are evenly arranged in a surrounding distribution on the side wall of the pipeline to be monitored; The pressure measuring device does not pass through the central axis of the airflow channel, and the position of its pressure measuring and collecting hole is consistent with the measuring device body.

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