CN214471071U

CN214471071U - Flow measuring device for composite material stamping air inlet

Info

Publication number: CN214471071U
Application number: CN202023240398.6U
Authority: CN
Inventors: 李艳娜; 齐社红; 张涛波; 乔相阳
Original assignee: AVIC First Aircraft Institute
Current assignee: Xian Aircraft Design and Research Institute of AVIC; AVIC First Aircraft Institute
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-10-22
Anticipated expiration: 2030-12-29

Abstract

The utility model provides a flow measuring device of combined material punching press air inlet, combined material punching press air inlet have relative parallel arrangement's last plane and lower plane at least, and flow measuring device includes: the positioning device is used for fixing the upper plane of the composite material stamping air inlet; the fixing device is used for fixing the lower plane of the composite material stamping air inlet; the static pressure sensor and the temperature sensor are arranged on the positioning device and are partially inserted into the inlet section of the composite material stamping air inlet; the upper end is installed in positioner, lower extreme and is installed in fixing device and pass the multiunit of the cross-section of combined material punching press air inlet entry and manage total pressure sensor, and the perforation location on combined material punching press air inlet is realized through positioner to multiunit of the pipe total pressure sensor that equalizes, and wherein, the last recess that is equipped with of fixing device, the pipe total pressure sensor that equalizes inserts in the recess. The utility model discloses it is less to combined material punching press air inlet destructiveness, can avoid the cracked possibility of flight in-process end root.

Description

Flow measuring device for composite material stamping air inlet

Technical Field

The utility model belongs to the technical field of aircraft environmental control, in particular to flow measuring device of combined material punching press air inlet.

Background

Ram air flow is an important data to measure in flight tests in the development of aerospace vehicles. Traditional aircraft structure adopts the shaping of aluminum alloy panel, utilizes the pitot tube flowmeter to realize ram air flow measurement, because the end of pitot tube flowmeter is the test tube of L type, the trompil size in ram air inlet structure can not the undersize (be greater than 10mm), otherwise the end can not stretch into. The structural opening of the body of the aluminum alloy material is structurally reinforced by a mature technology, and the requirement of mounting and opening the L-shaped end of the pitot tube flowmeter can be met.

However, in recent years, due to the characteristics of light weight, high strength, excellent elasticity, chemical corrosion resistance, good weather resistance and the like, composite materials are more and more widely applied to aircraft body structures, for example, a stamped air inlet structure integrally formed by fiber reinforced composite materials such as carbon fibers and the like. The fiber of the composite material greatly improves the properties of the material, such as strength, toughness and the like. However, in general, the variation of the cross-sectional area of the punching air inlet is complex, the punching air inlet needs to be integrally formed, and if fibers are broken, the strength and toughness of the composite material structure are greatly reduced, and a stress concentration point is also caused.

For a punching air inlet channel with a complex composite material and a large cross section, the requirement of opening of a pitot tube flowmeter (larger than 10mm) used in the traditional flow measurement cannot be met, the aperture is too small, and the end of the pitot tube cannot pass through; the trompil is too big, and the intensity of combined material structure can greatly reduced can cause the tearing problem of punching press intake duct structure even under long-time large-traffic ram air's effect. The traditional cantilever type uniform velocity tube flow sensor cannot meet the use requirement of a high-flow ram air inlet, and root fracture is easily caused under the impact of ram air for a long time. The traditional supporting type uniform-speed pipe flow sensor needs to penetrate through the lower surface of the stamping air inlet to fix the tail of the sensor, holes need to be formed in the upper surface and the lower surface of the stamping air inlet to fix the tail of the sensor, and the structure is large in destructiveness and difficult to install and implement for a complex large-section stamping air inlet structure made of a composite material.

Thus, ram air flow measurement of composite complex large cross-section ram air inlets has become a challenge in flight testing.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a flow measuring device of combined material punching press air inlet to solve or alleviate above-mentioned at least one problem.

The technical scheme of the utility model is that: a flow measurement device for a composite ram air inlet having at least upper and lower oppositely disposed planar surfaces, the flow measurement device comprising:

the positioning device is used for fixing the upper plane of the composite material stamping air inlet;

the fixing device is used for fixing the lower plane of the composite material stamping air inlet; and

the static pressure sensor and the temperature sensor are arranged on the positioning device and are partially inserted into the inlet section of the composite material stamping air inlet;

the upper end is installed positioner, lower extreme are installed in fixing device and are passed the multiunit of combined material punching press air inlet entry cross-section and all manage total pressure sensor, multiunit the trompil location on combined material punching press air inlet is realized through positioner to all pressure sensor of the pipe of equalling speed, wherein, the last recess that is equipped with of fixing device, the end that all pressure sensor was managed to the pipe of equalling speed inserts in the recess.

Furthermore, the composite material stamping air inlet is integrally formed by adopting a fiber reinforced composite material.

Further, the cross-section of the composite ram air inlet comprises a rectangle, a trapezoid or a regular hexagon.

Furthermore, a sealing gasket is arranged between the total pressure sensor of the uniform velocity tube and the positioning device.

Furthermore, a protective sleeve is arranged on the opening of the composite material stamping air inlet.

Further, the positioning device and the fixing device are fixed with the upper plane or the lower plane of the composite material stamping air inlet in an adhesive mode.

Furthermore, a preset gap is reserved between the end head of the total pressure sensor of the uniform velocity tube inserted into the groove of the fixing device and the bottom of the groove.

Further, the preset gap is 1 mm-2 mm.

The utility model provides a flow measuring device need not to open too big hole on the organism structure of combined material punching press import, also need not to open a hole so that stretch out the structural style that the outer terminal of punching press intake duct structure supported at punching press intake duct lower surface with the sensor afterbody, and is less to carbon-fibre composite's organism structure destructiveness, can avoid flying in-process ram air to lead to the cracked possibility of end root to the impact of end.

Drawings

In order to more clearly illustrate the technical solution provided by the present invention, the following briefly introduces the accompanying drawings. It is to be understood that the drawings described below are merely exemplary of some of the embodiments of the invention.

Fig. 1 is the overall schematic view of the flow rate measuring device of the present invention.

Fig. 2 is a sectional view taken along the direction a-a in fig. 1.

Fig. 3 is an enlarged view of a portion B in fig. 2.

Fig. 4 is an enlarged view of a portion C in fig. 2.

Detailed Description

In order to make the purpose, technical solution and advantages of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to perform more detailed description on the technical solution in the embodiments of the present invention.

The utility model aims at providing an adopt temperature, static pressure and the equal fast pipe total pressure sensor's of multiunit combination formula flow measuring device installs the punching press intake duct entrance that constitutes at carbon fibre enhancement mode combined material to realize evenly accurately measuring temperature on the punching press air inlet cross-section, always press and static pressure, can accurately reachd the punching press air mass flow of punching press air inlet.

As shown in fig. 1 to 4, the utility model provides a flow measuring device of combined material punching press air inlet includes: the device comprises a temperature sensor 2, a static pressure sensor 3, a total pressure sensor 6 of the uniform velocity tube, a positioning device 1 and a fixing device 5.

The composite ram air inlet 4 is a fiber reinforced composite that is integrally formed. The composite ram air inlet 4 has oppositely disposed upper and lower

flat surfaces

41, 42 for mounting the components described above. In some embodiments of the present invention, the cross-sectional shape of the composite ram air inlet 4 may be rectangular, trapezoidal, regular hexagonal, or other shape having oppositely disposed upper and

lower flats

41, 42.

The positioning device 1 is fixed to the upper plane 41 of the composite ram air inlet 4.

The fixing means is fixed to the lower planar surface 42 of the composite ram air inlet 4.

In some preferred embodiments of the present invention, the positioning device 1 and the fixing device 5 are fixed to the upper and lower surfaces of the composite ram air inlet 4 by gluing.

The upper ends of the multiple groups of total pressure sensors 6 of the averaging pitot are arranged on the positioning device 1, and the lower ends are arranged on the fixing device 5, wherein the upper ends penetrate through the upper plane 41 of the composite material stamping air inlet 4, and the ends of the upper ends are fixed by the fixing device 5 without penetrating through the lower plane 42 of the composite material stamping air inlet 4. The fixing device 5 is provided with a groove, and the end of the total pressure sensor 6 of the averaging pitot tube is inserted into the groove so as to prevent the end from shaking and even breaking due to overlarge ram air flow rate during flying. Preferably, a gap is reserved between the bottom of the end head of the total pressure sensor 6 of the averaging pitot tube and the bottom of the groove so as to balance the small change of the length of the end head caused by thermal expansion and cold contraction. Wherein the gap is preferably 1mm to 2 mm.

In the present embodiment, the number of the averaging pitot tube total pressure sensors 6 is 3 groups. It is understood that the number of the averaging pitot tube total pressure sensors 6 can be adjusted according to actual needs.

The utility model discloses in, it has sealed 7 to fill up between total pressure sensor 6 of uniform velocity tube and positioner 1 to further improve sealed effect.

The utility model provides a total pressure sensor 6 is managed to speed equalizer passes through positioner 1 and 5 trompil positions departments of guaranteeing to set up on combined material punching press air inlet 4 of fixing device. Preferably, a protective sleeve 8 is arranged at the edge of the opening on the composite material stamping air inlet 4 for protection.

The ram air inlet structure is integrally formed by carbon fiber reinforced composite materials, and holes larger than 6mm cannot be formed, so that the flow of ram air cannot be measured by adopting a traditional pitot tube. The combined flow measuring device adopting the temperature sensors, the static pressure sensors and the total pressure sensors of the multiple groups of uniform velocity tubes is used for measuring the flow rate of the punching air, the diameter of an opening of the composite material punching air inlet structure is small, only the opening is formed in the upper surface of the punching air inlet, and the opening size is not larger than phi 6 mm. The end part of sensor is fixed in bonds in the fixing device 5 of the inside lower surface of punching press intake duct, can avoid flight in-process ram air to the impact of end cause the afterbody end shake of the inside lower surface of samming pipe total pressure sensor to lead to the cracked possibility of root, also need not to stretch out the terminal support form outside the punching press intake duct structure with the afterbody in order to adopt at punching press intake duct lower surface trompil, it is less to carbon-fibre composite's organism structure destruction, positioner can fix a position the mounted position of samming pipe fast accurately, the afterbody end of samming pipe total pressure sensor and the clearance of whole fixing device recess department can balance the slight change of samming pipe total pressure sensor length when expending with heat and contracting with cold simultaneously. The method realizes accurate measurement of the ram air flow of the complex large-section ram air inlet channel made of the composite material in the flight test.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A flow measuring device for a composite ram air inlet, the composite ram air inlet (4) having at least an upper plane (41) and a lower plane (42) disposed in opposition, the flow measuring device comprising:

the positioning device (1) is used for fixing the upper plane of the composite material stamping air inlet (4);

a fixing device (5) for fixing the lower plane of the composite material stamping air inlet (4); and

a static pressure sensor (3) and a temperature sensor (2) which are arranged on the positioning device (1) and are partially inserted into the inlet section of the composite material stamping air inlet (4);

the upper end is installed positioner (1), lower extreme are installed and are passed the multiunit of combined material punching press air inlet (4) entry cross-section and all pressure sensor (6) are managed to the samming in fixing device (5), multiunit the trompil location on combined material punching press air inlet (4) is realized through positioner (1) to the pipe that samming is managed to total pressure sensor (6), wherein, be equipped with the recess on fixing device (5), the end that the samming managed to total pressure sensor (6) is inserted in the recess.

2. A composite ram air inlet flow measurement device according to claim 1, wherein the composite ram air inlet (4) is integrally formed from a fibre reinforced composite material.

3. A composite ram air inlet flow measurement device according to claim 2, wherein the cross-section of the composite ram air inlet (4) comprises a rectangle, trapezoid or regular hexagon.

4. A flow measuring device for composite material ram air inlets according to claim 1, characterized in that a sealing gasket (7) is provided between the averaging tube total pressure sensor (6) and the positioning device (1).

5. A composite ram air inlet flow measurement device according to claim 1, wherein the openings of the composite ram air inlet (4) are provided with a protective cover (8).

6. A composite material ram air inlet flow measurement device according to claim 1, characterised in that the positioning means (1), the fixing means (5) and the upper or lower plane of the composite material ram air inlet (4) are fixed together by gluing.

7. A flow measuring device for composite ram air inlets, as claimed in claim 1, characterized in that the head of said averaging tube total pressure sensor (6) inserted into the recess of the fixture (5) has a predetermined clearance from the bottom of said recess.

8. The composite stamped air inlet flow measurement device of claim 7, wherein the predetermined gap is between 1mm and 2 mm.