An internal flow field flow characteristic capturing device for intake passage testing

Abstract

The application belongs to the technical field of aero-engine inlet duct test, and provides an inner flow field flow characteristic capturing device for inlet duct test, which comprises an inner sleeve, the outer part of the inner sleeve is sleeved with a mounting shell coaxial with the inner sleeve, a driving mechanism connected with the inner sleeve is arranged on the mounting shell; a plurality of sealing rings are arranged between the inner sleeve and the mounting shell along the flow direction of the inner flow field airflow, an annular airflow passage is formed between two adjacent sealing rings, wall surface through holes communicating with the annular airflow passage are arranged on the inner sleeve and the mounting shell; a test mechanism is arranged inside the inner sleeve, and a gas leading-out pipe inserted into each wall surface through hole on the inner sleeve is arranged on the test mechanism. The application has the advantages of simple structure, flexible volume, strong universality, and is suitable for the inner flow field flow characteristic capturing demand of various test pieces in the inlet duct test, has little influence on the test flow field, is convenient to disassemble and replace the test assembly to meet different test demands.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine inlet duct testing technology, and relates to an internal flow field flow characteristic capture device for inlet duct testing. Background Technology

[0002] In aero-engine inlet testing, the measurement section of the test piece is generally measured using fixed test components. Taking the measuring rake as an example, this testing method requires consideration of the clogging effect of the measuring rake on the flow field. It generally adopts a cross or zigzag rake measurement scheme. Its test layout is fixed and the number of measuring points is limited. It is impossible to obtain detailed and complete pressure, temperature and other distribution data of the target flow field cross section, which limits the testing and evaluation of the flow field cross section.

[0003] In recent years, rotating measurement structures have emerged in measurement section design. These structures involve installing test components such as measuring rakes inside a rotating sleeve. By rotating the sleeve relative to the fixed support, multi-angle measurements of cross-sectional parameters can be achieved. However, this method is always accompanied by the problem of the measuring pipeline winding along the rotation direction, which limits the usable space. Furthermore, the pipeline that cannot be fixed during the air intake test is not conducive to the test.

[0004] Therefore, it is necessary to design a device with the function of capturing internal flow field characteristics, so as to realize the flow characteristic capture method without relying on traditional pipelines, and replace the previous fixed measurement section and imperfect rotating measurement section. Summary of the Invention

[0005] To address the limitations of existing fixed measurement sections in flow field section testing and evaluation, and the technical problems of pipelines in rotating measurement sections hindering experimental operations, this invention discloses an internal flow field characteristic capture device for inlet duct testing. The device includes an inner sleeve, and an outer mounting shell coaxial with the inner sleeve is fitted around the inner sleeve. The mounting shell is provided with a drive mechanism connected to the inner sleeve.

[0006] Multiple sealing rings are provided between the inner sleeve and the mounting housing along the airflow direction of the internal flow field, and an annular airflow channel is formed between two adjacent sealing rings. Both the inner sleeve and the mounting housing are provided with wall through holes that communicate with the annular airflow channel.

[0007] The inner sleeve is equipped with a testing mechanism, and the testing mechanism is equipped with a gas outlet tube that is inserted into each of the through holes on the wall of the inner sleeve.

[0008] Furthermore, the testing mechanism includes a connecting part, which is fixed to the inner wall of the inner sleeve. The connecting part is provided with a bracket that extends into the flow field, and the bracket is provided with multiple gas outlet pipes, the inlets of which face the incoming flow direction.

[0009] Further, the connecting part comprises a fixing seat and a connecting rod, the fixing seat is fixed in the mounting groove of the end face of the inner sleeve by screws, and the connecting rod is arranged in the groove of the inner wall surface of the inner sleeve.

[0010] Further, the gas leading-out pipe comprises a first leading-out pipe and a second leading-out pipe, the second leading-out pipe is connected with the first leading-out pipe, the gas inlet of the first leading-out pipe faces the flow direction, and the second leading-out pipe is perpendicular to the wall surface of the inner sleeve and is inserted into the through hole in the upper wall surface of the inner sleeve.

[0011] Further, the position of the gas leading-out pipe on the bracket is filled with sealing glue.

[0012] Further, the driving mechanism comprises a motor, a speed reducer is connected to the motor, the speed reducer is fixed on the mounting shell through a mounting seat, a driving gear is connected to the speed reducer through a shaft coupling, and the driving gear is engaged with the transmission gear on the outer peripheral wall of the inner sleeve.

[0013] Further, a motor cover is arranged outside the driving mechanism.

[0014] Further, an adapter pipe is connected to each of the wall through holes of the mounting shell, the adapter pipe is connected with a test device, and the test device is used for detecting the pressure and temperature of the flow field gas led out through the adapter pipe in real time.

[0015] Further, the mounting shell comprises a first shell and a second shell, and the two ends of the first shell and the second shell are provided with connecting flanges.

[0016] Further, a deep groove ball bearing is arranged between the mounting shell and the inner sleeve, and an O-shaped sealing ring is arranged near one end of the deep groove ball bearing.

[0017] Compared with the prior art, the above at least one technical solution adopted by the embodiments of the present application can achieve the beneficial effects at least including:

[0018] 1. The inner sleeve is driven to rotate by the driving mechanism, so that the test mechanism fixed in the inner sleeve can test the angles of the measurement section of the flow field, and the number of test mechanisms is small, and the influence on the measurement section is small.

[0019] 2. Less impact on test equipment: the device has flexible volume, and can be applied to most target areas to be measured, especially in smaller installation space; and the components of the device are contained in the installation shell and motor cover, which is relatively flat and smooth in appearance, greatly reducing the impact on the test flow field when applied to the inlet test equipment, and also relatively reducing the impact of the inlet test on the motor and other driving components; and the device has less pipeline, and no pipeline winding and movement problems during rotation.

[0020] 3. Good versatility: the structure is relatively simple, easy to disassemble, and can be adjusted in size according to the size of different measured targets, and the type and number of test mechanisms on the inner sleeve can also be adjusted according to different measurement requirements, effectively increasing the way of obtaining test data.

[0021] 4. Low cost: the materials and processing costs used in the present application are relatively low, effectively reducing the construction cost of obtaining high-quality test data, and suitable for various test requirements.

[0022] In general, the present application provides an inner flow field flow characteristic capturing device with simple structure, flexible volume and strong versatility, which constructs a plurality of annular air flow channels that can realize sealing in relative rotation, and the airflow on the test mechanism passes through the measuring points into the annular air flow channel, and then is further introduced out of the device, realizing a flow characteristic capturing method without relying on traditional pipelines, and sequentially measuring the target parameters at each angle of the target flow field cross section, forming a relatively accurate and detailed inner flow field flow characteristic capturing result. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0024] Figure 1 It is an outer shape diagram of the inner flow field flow characteristic capturing device for inlet test of the present application;

[0025] Figure 2 It is a driving mechanism diagram of the inner flow field flow characteristic capturing device;

[0026] Figure 3 It is a sectional view of the inner flow field flow characteristic capturing device;

[0027] Figure 4 It is a schematic diagram of the test mechanism;

[0028] Figure 5 It is a schematic diagram of the test mechanism installed to the inner sleeve;

[0029] 1, first shell; 2, second shell; 3, motor cover; 4, drive gear; 5, shaft coupling; 6, mounting seat; 7, speed reducer; 8, motor; 9, test mechanism; 10, sealing ring; 11, adapter pipe; 12, sealing ring; 13, inner sleeve; 14, transmission gear; 15, deep groove ball bearing; 16, elastic retainer; 17, O-ring; 19, gas outlet pipe; 91, fixing seat; 92, connecting rod; 93, bracket; 191, first outlet pipe; 192, second outlet pipe. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be described in detail below with reference to the drawings.

[0031] The above embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. The present application can also be implemented or applied through other different specific embodiments, and various details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features of the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] In the description of the present embodiments, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two and more than two.

[0034] It should be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concepts of the present disclosure, and only the components related to the present disclosure are shown in the diagrams, not the number, shape and size of the components when actually implemented, and the shape, number and proportion of each component when actually implemented can be arbitrarily changed, and the layout of the components can also be more complex.

[0035] The embodiment of the present application discloses an inner flow field flow characteristic capturing device for air inlet test, referring to Figures 1 to 3 As shown, the device comprises an inner sleeve 13, the outer sleeve of the inner sleeve 13 is sleeved with a mounting shell coaxial with it, the mounting shell is provided with a driving mechanism connected with the inner sleeve 13, the measured air inlet test piece is connected to the air inlet end of the mounting shell, and the inner wall diameter of the inner sleeve 13 is the same as the inner wall diameter of the outlet of the measured air inlet test piece, so as to ensure that the flow field of the measured air inlet test piece input into the inner sleeve 13 will not change.

[0036] A plurality of sealing rings 10 are arranged between the inner sleeve 13 and the mounting shell along the flow direction of the inner flow field airflow, an annular airflow passage is formed between adjacent two sealing rings 10, the mounting shell is provided with a wall surface through hole in communication with the annular airflow passage, and the inner sleeve 13 is provided with a wall surface through hole in communication with part of the annular airflow passage. The inner sleeve 13 is internally provided with a test mechanism 9, the test mechanism 9 is provided with a gas leading-out pipe 19 inserted into each wall surface through hole of the inner sleeve 13, and each gas leading-out pipe 19 corresponds to a measuring point, that is, the number of measuring points corresponds to the number of wall surface through holes of the inner sleeve 13.

[0037] Specifically, a plurality of annular grooves can be processed on the inner wall surface of the mounting shell, a sealing ring 10 with a suitable size is arranged in each annular groove, the sealing ring 10 is fixed in each annular groove by using sealing glue, and the inner diameter of the sealing ring 10 is slightly smaller than the outer wall diameter of the corresponding position of the inner sleeve 13, so as to ensure that the sealing ring 10 can be pressed between the inner sleeve 13 and the mounting shell, and the independence of each annular airflow passage is ensured.

[0038] According to the present application, the annular airflow passages formed between adjacent two sealing rings 10 can make the airflows at different measuring point positions in the target flow field cross section of the measured air inlet test piece independent, and each measuring point position can be measured, and in order to facilitate the increase of the number of measuring points according to the test state in use, the number of annular airflow passages in the embodiment is more than the number of gas leading-out pipes 19.

[0039] When the above device is used to capture the flow characteristics of the internal flow field, the components of the device are assembled, and the device is connected to the test piece of the measured inlet channel. The gas flow of the test piece of the measured inlet channel enters the inner sleeve 13 and flows out through the outlet thereof, and the measured gas is also led out through the gas leading-out pipe 19 into the annular gas flow channel, and then led out through the wall surface through hole on the mounting shell for measurement. During the measurement process, the inner sleeve 13 is driven to rotate by the driving mechanism, thereby driving the test mechanism 9 to rotate, so that the flow field characteristics of each angle of the target flow field cross section of the test piece of the measured inlet channel can be captured and measured. In addition, in order to ensure accuracy during the test, when the inner sleeve 13 is rotated to a measurement position, a period of time is required to wait for the gas in the annular gas flow channel to stabilize before measurement is performed.

[0040] Further, as shown in Figure 4 and Figure 5 , the test mechanism 9 comprises a connecting portion fixed on the inner wall of the inner sleeve 13, and the connecting portion is provided with a support 93 extending into the flow field, and the support 93 is provided with a plurality of gas leading-out pipes 19, and the gas inlets of the gas leading-out pipes 19 are directed towards the incoming flow direction. In the present application, in order to reduce the influence of the support 93 on the flow field, the support 93 can be designed as a flat plate structure as shown in Figure 4 and Figure 5 .

[0041] Further, as shown in Figure 4 and Figure 5 , the connecting portion comprises a fixing seat 91 and a connecting rod 92, the fixing seat 91 is fixed in the mounting groove on the end face of the inner sleeve 13 through screws, and the connecting rod 92 is arranged in the groove on the inner wall surface of the inner sleeve 13.

[0042] In the present application, the fixing seat 91 and the connecting rod 92 of the connecting portion can be connected to form a T-shaped structure, and the grooves (including the mounting groove and the groove) on the inner sleeve 13 are also T-shaped. In order to avoid the influence of the connecting portion on the flow field, a mounting groove can be machined on the end face of the inner sleeve 13, the surface of the fixing seat 91 flush with the inner and outer wall surfaces of the inner sleeve 13 is set as a circular arc surface, and the fixing seat 91 is embedded in the mounting groove. At the same time, a groove is machined on the inner wall surface of the inner sleeve 13, the thickness of the groove is less than the thickness of the inner sleeve 13, and the connecting rod 92 is embedded in the groove, and the surface of the connecting rod 92 directed towards the flow channel is machined as a circular arc surface. When the connecting portion and the grooves on the inner sleeve 13 are installed in place, the inner and outer wall surfaces of the inner sleeve 13 are complete cylindrical surfaces. In addition, each of the wall surface through holes on the inner sleeve 13 is arranged in the groove.

[0043] Further, as shown in Figure 4As shown, the gas outlet pipe 19 includes a first outlet pipe 191 and a second outlet pipe 192 connected with the first outlet pipe 191. Specifically, the gas outlet pipe 19 can be bent to achieve the connection, or a bent pipe can be used to connect the two outlet pipes. The gas inlet of the first outlet pipe 191 faces the flow direction. The second outlet pipe 192 is perpendicular to the wall of the inner sleeve 13, and the gas outlet end is inserted into the through hole in the upper wall of the inner sleeve 13.

[0044] In addition, in the present application, the size, the number of measuring points, and the type of the gas outlet pipe 19 of the testing mechanism 9 can be changed according to different test conditions and test requirements, and the inner sleeve 13 can be replaced accordingly, so that the testing mechanism 9 and the inner sleeve 13 can be replaced under the condition of meeting the installation size of the installation shell, thereby increasing the versatility of the device.

[0045] Furthermore, in order to ensure the sealing of the testing mechanism 9 and prevent gas from entering the annular gas flow channel through the connection position, the position of the gas outlet pipe 19 on the bracket 93 is filled with sealing glue.

[0046] Further, the end face of the inner sleeve 13 at the position of the testing mechanism 9, i.e., the gas inlet position, is designed with a chamfer. When the inner sleeve 13 is axially moved and inserted into the installation shell, the chamfer can reduce the obstruction of the sealing ring 10 to the movement of the inner sleeve 13. Specifically, the chamfer angle can be set to 20-40°, with 30° being the best, and the outer diameter of the end face after the chamfer needs to be smaller than the inner diameter of the sealing ring 10.

[0047] The wall through hole on the inner sleeve 13 is perpendicular to the inner and outer walls of the inner sleeve 13, and its diameter is greater than that of the gas outlet pipe 19. A counterbore is processed on the side close to the inner wall of the wall through hole, and the sealing ring 12 is fixed in the counterbore by using sealing glue. The thickness of the sealing ring 12 does not exceed the thickness of the counterbore. The sealing ring 12 can be made of elastic material and has a hole in the center with a diameter smaller than that of the gas outlet pipe 19. After the gas outlet pipe 19 is inserted, it is tightly combined with the sealing ring 12 to achieve the sealing between the gas outlet pipe 19 and the wall through hole.

[0048] Since the inner wall of the inner sleeve 13 is a gas flow channel, the roughness requirement is high to reduce the influence on the gas flow. A roughness of Ra1.6 or below can be selected.

[0049] Further, referring to Figure 2 and Figure 3As shown, the driving mechanism comprises a motor 8, a speed reducer 7 connected to the motor 8, the speed reducer 7 is fixed on the mounting shell through a mounting seat 6, the speed reducer 7 is connected with a driving gear 4 through a shaft coupling 5, the mounting seat 6 is designed with a through hole at the corresponding position of the shaft coupling 5, so as to leave installation space for the shaft coupling 5. The mounting shell is processed with an open slot at the position corresponding to the transmission gear 14, so that the driving gear 4 can engage with the transmission gear 14 through the open slot. Specifically, the diameter of the inner wall of the mounting shell is greater than the large diameter of the transmission gear 14, the size of the open slot is selected according to the space required by gear transmission, and the precision, the diameter of the index circle and the modulus of the two gears are selected according to the actual situation.

[0050] The transmission gear 14 can be fixed on the inner sleeve 13 by screws, or can be integrally formed with the inner sleeve 13 to form a part. When the driving mechanism works, the motor 8 drives the speed reducer 7 to rotate, the speed reducer 7 drives the driving gear 4 to rotate through the shaft coupling, the driving gear 4 can drive the transmission gear 14 engaged therewith to rotate, so that the inner sleeve 13 can rotate relative to the mounting shell, and the position of the test mechanism 9 fixed in the inner sleeve 13 changes.

[0051] Further, referring to Figure 1 and Figure 3 As shown, the driving mechanism is externally provided with a motor cover 3, the motor cover 3 is fixed on the outer wall of the mounting shell by screws, and is used for wrapping the motor 8, the speed reducer 7, the shaft coupling 5 and the driving gear 4, so as to reduce the influence of airflow on them during the test.

[0052] Further, referring to Figure 1 and Figure 3 As shown, the mounting shell is connected with an adapter pipe 11 at each wall through hole, the through hole is perpendicular to the inner and outer walls of the mounting shell, and a countersunk hole structure is processed on the outer wall of the mounting shell for mounting the adapter pipe 11. Specifically, the adapter pipe 11 is fixed in the countersunk hole by using sealing glue, and the adapter pipe 11 can be connected with the pipeline of the test equipment to realize the measurement of various test data such as pressure and temperature.

[0053] Further, referring to Figures 1 to 3 As shown, the mounting shell comprises a first shell 1 and a second shell 2, the two ends of the first shell 1 and the second shell 2 are provided with connecting flanges, the connecting flanges at the joint position of the first shell 1 and the second shell 2 are connected through mounting screws, and the connecting flanges at the two ends of the second shell 2 and the first shell 1, i.e. the connecting flanges at the two ends of the mounting shell, are respectively connected with the test piece of the measured inlet channel and various test devices at the rear end.

[0054] In addition, referring to Figure 1 and Figure 3As shown, the testing mechanism 9, drive mechanism, and other components are mounted on the second housing 2, while the deep groove ball bearing 15 and other components are mounted on the first housing 1. See also... Figure 3 As shown, in order to ensure that the device can effectively reduce its volume while maintaining the structural functions of each part, the outer wall diameter of the part corresponding to the annular airflow channel in the inner sleeve 13 is larger than that of the rest, and the inner wall diameter of the inner sleeve 13 is consistent with the inner wall diameter of the connecting flanges at both ends of the mounting housing; the inner wall diameter of the part corresponding to the annular airflow channel in the mounting housing is smaller than that of the rest except for the connecting flange part, and the outer wall diameter of the mounting housing is always consistent.

[0055] Furthermore, see Figure 3 As shown, a deep groove ball bearing 15 is provided between the mounting housing and the inner sleeve 13, and an O-ring 17 is provided at one end near the deep groove ball bearing 15. The O-ring 17 can form a dynamic seal to complete the seal between the inner sleeve 13 and the mounting housing. At the same time, grease can be applied to the sealing ring 10 and the O-ring 17 to reduce the friction between the inner sleeve 13 and the sealing ring 10 and the O-ring 17 when the flow characteristic capturing device rotates.

[0056] Furthermore, a stepped surface is designed on the inner sleeve 13 near the airflow outlet. This stepped surface can axially position the inner ring of the deep groove ball bearing 15, and the elastic retaining ring 16 is embedded in the groove of the inner sleeve 13 to secure the inner ring of the deep groove ball bearing 15. Specifically, the inner sleeve 13 and the inner ring of the deep groove ball bearing 15 can be fitted with a transition or interference fit. At the same time, a stepped surface is also designed on the inner peripheral wall of the mounting housing at the corresponding position to axially position the outer ring of the deep groove ball bearing 15. The mounting housing and the outer ring of the deep groove ball bearing 15 can be fitted with a transition or interference fit, and relative rotation between the inner sleeve 13 and the mounting housing can be achieved after assembly.

[0057] The embodiments of the present invention achieve the following technical effects:

[0058] 1. The inner sleeve is rotated by the drive mechanism, so that the test mechanism fixed inside the inner sleeve can test the angles of the measurement section of the flow field. The number of test mechanisms is small and the impact on the measurement section is small.

[0059] 2. Minimal impact on testing equipment: This device is flexible in size and can be applied to most target areas, especially areas with limited installation space. Furthermore, all components of the device are contained within the mounting housing and motor cover, resulting in a relatively flat and smooth appearance. When applied to inlet duct testing equipment, this greatly reduces the impact on the test flow field and also relatively reduces the impact of inlet duct testing on drive components such as motors. In addition, the device has fewer pipelines, eliminating the problems of pipeline entanglement and movement during rotation.

[0060] 3. Good versatility: The structure is relatively simple and easy to disassemble. The size can be adjusted according to the size of different test targets. The type and number of test mechanisms on the inner sleeve can also be adjusted according to different measurement needs, effectively increasing the ways to obtain test data.

[0061] 4. Low cost: The materials and processing costs used in this invention are low, which effectively reduces the construction cost of obtaining high-quality test data and is suitable for various test requirements.

[0062] In summary, this invention provides an internal flow field flow characteristic capture device with simple structure, flexible size, and strong versatility. By constructing multiple annular airflow channels that can be sealed during relative rotation, the airflow from the measuring point on the testing mechanism enters the annular airflow channel and is then led out of the device, realizing a flow characteristic capture method that does not rely on traditional pipelines. The target parameters of each angle of the target flow field cross section are measured sequentially, forming a relatively accurate and detailed internal flow field flow characteristic capture result.

[0063] Obviously, those skilled in the art should understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and variations of the embodiments of the present invention are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0064] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for capturing internal flow field characteristics in an air intake test, characterized in that, It includes an inner sleeve (13), and a mounting housing coaxial with the inner sleeve (13) is fitted on the outside of the inner sleeve (13). The mounting housing is provided with a drive mechanism connected to the inner sleeve (13). Multiple sealing rings (10) are provided between the inner sleeve (13) and the mounting housing along the airflow direction of the inner flow field. An annular airflow channel is formed between two adjacent sealing rings (10). Both the inner sleeve (13) and the mounting housing are provided with wall through holes that communicate with the annular airflow channel. The inner sleeve (13) is provided with a testing mechanism (9), and the testing mechanism (9) is provided with a gas outlet pipe (19) that is inserted into each of the wall through holes on the inner sleeve (13). The testing mechanism (9) includes a connecting part, which is fixed on the inner wall of the inner sleeve (13). The connecting part is provided with a bracket (93) extending into the flow field. The bracket (93) is provided with a plurality of gas outlet pipes (19), and the gas outlet pipes (19) have their inlets facing the direction of the incoming flow. The connecting part includes a fixed seat (91) and a connecting rod (92). The fixed seat (91) is fixed in the mounting groove on the end face of the inner sleeve (13) by screws, and the connecting rod (92) is set in the groove on the inner wall of the inner sleeve (13). The gas outlet pipe (19) includes a first outlet pipe (191) and a second outlet pipe (192). The second outlet pipe (192) is connected to the first outlet pipe (191). The air inlet of the first outlet pipe (191) faces the incoming flow direction. The second outlet pipe (192) is perpendicular to the wall of the inner sleeve (13), and the outlet end is inserted into the through hole on the upper wall of the inner sleeve (13).

2. The internal flow field characteristic capturing device for inlet duct testing according to claim 1, characterized in that, The location on the support (93) where the gas outlet pipe (19) is located is sealed with sealant.

3. The internal flow field characteristic capturing device for inlet duct testing according to claim 1, characterized in that, The drive mechanism includes a motor (8), a reducer (7) is connected to the motor (8), the reducer (7) is fixed on the mounting housing via a mounting base (6), and the reducer (7) is connected to a drive gear (4) via a coupling (5). The drive gear (4) meshes with a transmission gear (14) on the outer peripheral wall of the inner sleeve (13).

4. The internal flow field characteristic capture device for inlet duct testing according to claim 1 or 3, characterized in that, The drive mechanism is provided with a motor cover (3).

5. The internal flow field characteristic capture device for inlet duct testing according to claim 1, characterized in that, Each of the wall through holes of the mounting housing is connected to a connector (11), which is connected to a testing device. The testing device is used to detect the pressure and temperature of the flow field gas drawn out through the connector (11) in real time.

6. The internal flow field characteristic capturing device for inlet duct testing according to claim 1, characterized in that, The mounting housing includes a first outer shell (1) and a second outer shell (2), and both ends of the first outer shell (1) and the second outer shell (2) are provided with connecting flanges.

7. The internal flow field flow characteristic capturing device for inlet duct testing according to claim 6, characterized in that, A deep groove ball bearing (15) is provided between the mounting housing and the inner sleeve (13), and an O-ring (17) is provided at one end near the deep groove ball bearing (15).

Images