Solid state aerodynamic angle probe

Abstract

The present application relates to the technical field of aviation instrument, disclose a kind of solid-state aerodynamic angle probe, adopt fixed conical body as conical body receiving part, 8 pressure measuring grooves are opened in the circumferential direction of conical body, and are evenly distributed with 45 ° between pressure measuring grooves.When using, one of pressure measuring grooves is oriented to the direction of flow, so that the central axis of conical body receiving part is perpendicular to the direction of flow;When aerodynamic angle changes, the pressure value of each pressure measuring groove symmetric to pressure measuring groove as axis of symmetry changes, and the aerodynamic angle value can be deduced through the pressure difference of symmetric groove, without any rotating mechanism, and the reliability is high.

Description

Technical Field

[0001] This invention relates to the field of aviation instrument technology and discloses a solid-state aerodynamic angle probe. Background Technology

[0002] During flight, aircraft need to have their flight attitude monitored in real time. Angle of attack sensors are important measuring devices for measuring changes in the angle of attack of aircraft. Currently, the most commonly used angle of attack sensor is the rotating wind vane type angle of attack sensor. It uses the clamping effect of high-speed airflow on the wind vane to keep the wind vane always aligned with the direction of the incoming wind, thereby measuring the angle of attack. However, due to the presence of a rotating mechanism inside, its reliability is relatively low. Summary of the Invention

[0003] The purpose of this invention is to provide a solid-state pneumatic angle probe that can calculate the pneumatic angle by measuring the pressure difference between the pressure gauges, without the need for any rotating mechanism, and with high reliability.

[0004] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is as follows:

[0005] A solid-state pneumatic angle probe includes a conical sensing part, on which pressure measuring grooves are formed. The number of pressure measuring grooves is eight, and each pressure measuring groove is formed on the conical surface along the corresponding generatrix direction of the conical body. The eight pressure measuring grooves are evenly distributed around the conical sensing part, and each pressure measuring groove is provided with an air passage connected to a pressure sensor.

[0006] Furthermore, the cone apex of the cone-shaped sensor is a spherical structure, and the spherical structure is tangent to the cone surface of the cone-shaped sensor.

[0007] Furthermore, the position of the cone-shaped sensing part near the cone apex is a turbulence zone, and the pressure measuring groove is located on the cone surface away from the turbulence zone at the cone apex.

[0008] Furthermore, one of the eight pressure measuring slots faces the incoming flow direction, while the remaining pressure measuring slots are spatially symmetrically distributed with the central axis of the pressure measuring slot facing the incoming flow direction as the axis of symmetry.

[0009] Furthermore, the distance from the cone apex to the three pressure gauges facing away from the incoming flow direction is greater than the distance from the cone apex to the five pressure gauges facing the incoming flow direction.

[0010] Furthermore, it also includes a calculation component, which includes a pressure sensor and a calculation circuit. The pressure sensor is used to communicate with the corresponding air path, and the calculation circuit is used to receive the pressure signal collected by the pressure sensor and calculate the angle of attack based on the pressure signal.

[0011] Furthermore, it also includes a pressure self-test sensor, which is arranged in a silicon piezoresistive sensor array with the eight pressure sensors. This array is used to perform self-tests of the eight pressure sensors with the pressure self-test sensor as a reference when the solid-state pneumatic angle probe is in operation.

[0012] Furthermore, the cone-shaped sensing part has a hollow structure inside, and a heating wire is installed on the inner surface of the cone-shaped sensing part.

[0013] Compared with the prior art, the beneficial effects of this invention are as follows: This invention uses a fixed conical body as the conical sensing element, and a total of 8 pressure measuring grooves are opened in the circumferential direction of the conical body, which are evenly distributed at 45° intervals. In use, one of the pressure measuring grooves is oriented towards the incoming flow direction, so that the central axis of the conical sensing element is perpendicular to the incoming flow direction; when the aerodynamic angle changes, the pressure values ​​of each pressure measuring groove symmetrical about the pressure measuring groove changes. The aerodynamic angle value can be inferred from the pressure difference of the symmetrical grooves, without the need for any rotating mechanism, thus ensuring high reliability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the solid-state pneumatic angle probe structure in Example 1 or 2;

[0015] Figure 2 This is a perspective view of the solid-state pneumatic angle probe in Example 1 or 2;

[0016] Figure 3 This is a schematic diagram of the internal structure of the solid-state pneumatic angle probe in Example 2;

[0017] Figure 4 This is a schematic diagram showing the distribution of the pressure measuring grooves on the sensing part of the conical body in Example 2;

[0018] Among them, 1. Conical sensing part; 101. Pressure measuring groove; 102. Air path; 2. Calculation component; 201. Pressure sensor; 202. Calculation circuit; 203. Pressure self-test sensor; 3. Heating wire; 4. Glass adapter. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the above-described subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0020] Example 1

[0021] See Figure 1 and Figure 2A solid-state pneumatic angle probe includes a conical sensing part 1. The conical sensing part 1 has eight pressure measuring grooves 101 formed on its conical surface. Each pressure measuring groove 101 is formed on the conical surface along the corresponding generatrix direction of the conical body. The eight pressure measuring grooves 101 are evenly distributed around the conical sensing part 1. Each pressure measuring groove 101 is provided with an air passage 102 that communicates with a pressure sensor 201.

[0022] In this embodiment, a fixed cone-shaped body is used as the cone-shaped sensing element 1. Eight pressure measuring grooves 101 are formed in the circumferential direction of the cone-shaped body, and the pressure measuring grooves 101 are evenly distributed at 45° intervals. In use, one of the pressure measuring grooves 101 is oriented towards the incoming flow direction, so that the central axis of the cone-shaped sensing element 1 is perpendicular to the incoming flow direction. When the aerodynamic angle changes, the pressure values ​​of each pressure measuring groove 101 symmetrical about the pressure measuring groove 101 change. The aerodynamic angle value can be inferred from the pressure difference of the symmetrical grooves. No rotating mechanism is required, resulting in high reliability.

[0023] In this embodiment, the cone apex of the cone-shaped sensing part 1 is a spherical structure, and the spherical structure is tangent to the cone surface of the cone-shaped sensing part 1, which can reduce the disturbance of the incoming flow to the cone-shaped sensing part 1 and improve the measurement accuracy of the aerodynamic angle.

[0024] Aerodynamic simulation calculations show that a certain area from the cone apex is a tip turbulence zone, where pressure is unstable and turbulence exists, which is unfavorable for pressure measurement. To further improve pressure measurement accuracy, in this embodiment, the pressure measuring groove 101 is positioned on the cone surface away from the tip turbulence zone.

[0025] Example 2

[0026] See Figures 1-4 A solid-state pneumatic angle probe includes a conical sensing part 1 and a calculation component 2; the conical sensing part 1 has pressure measuring grooves 101 formed on its conical surface, and the number of pressure measuring grooves 101 is 8 (e.g., ...). Figure 4The pressure measuring grooves 101 (numbered 1#, 2#, 3#, 4#, 5#, 6#, 7#, and 8#) are respectively formed on the cone surface along the corresponding generatrix direction of the cone. The eight pressure measuring grooves 101 are evenly distributed around the circumference of the cone sensing part 1, and each pressure measuring groove 101 is provided with an air passage 102 connected to the pressure sensor 201. Among the eight pressure measuring grooves 101, pressure measuring groove 1# faces the incoming flow direction, and the remaining pressure measuring grooves 101 are spatially symmetrically distributed with the central axis of the pressure measuring groove 101 facing the incoming flow direction as the axis of symmetry. The distance from the cone apex to the three pressure measuring grooves 101 (6#, 7#, and 8#) facing away from the incoming flow direction is greater than the distance from the cone apex to the five pressure measuring grooves 101 (1#, 2#, 3#, 4#, and 5#) facing the incoming flow direction. The calculation component 2 includes a pressure sensor 201 and a calculation circuit 202. The pressure sensor 201 is used to communicate with the corresponding air passage 102, and the calculation circuit 202 is used to receive the pressure signal collected by the pressure sensor 201 and calculate the angle of attack based on the pressure signal.

[0027] In this embodiment, the cone-shaped sensing unit 1 senses the pressure value on the surface of the cone and outputs the pressure value to the pressure sensor 201 within the calculation component. Simultaneously, the cone-shaped sensing unit 1 has a built-in electric heater to provide icing protection for the product. The calculation component 2 includes a pressure sensor 201 and a calculation circuit 202. The pressure sensor 201 converts the air pressure signal output by the cone-shaped sensing unit 1 into an electrical signal, and the calculation circuit 202 receives the electrical signal and outputs the result based on the calculated local angle of attack.

[0028] A certain area from the cone apex is a top-end turbulence zone, where pressure is unstable and turbulence exists, which is unfavorable for pressure measurement. The extent of this zone is related to the spherical radius and cone angle of the cone apex. In this embodiment, the cone angle of the cone-shaped sensing part 1 is 13°. The cone apex is spherical and tangent to the cone surface, with a sphere radius of SR4.5mm. The height of the cone (from the spherical cone apex to the upper surface of the mounting flange) is 105mm. According to simulation results, the area within 30mm of the cone apex is a turbulence zone. Therefore, the pressure measuring groove 101 on the windward side of the product is 35mm from the cone apex to avoid the adverse effects of the top-end turbulence zone on pressure measurement.

[0029] In this embodiment, the generatrix length of the hypotenuse of the conical sensing part 1 is 15mm, the width of the pressure measuring groove 101 is 1mm, and it is opened in the normal direction. The long side of the pressure measuring groove 101 is in the same direction as the generatrix of the conical body. The angle between the pressure measuring grooves 101 in the circumferential direction of the conical body is evenly distributed at 45°, so a total of 8 pressure measuring grooves 101 are opened. Among the 8 pressure measuring grooves 101, the 5 pressure measuring grooves 101 on the windward side (1#, 2#, 3#, 4#, 5#) are closer to the cone apex, while the 3 pressure measuring grooves 101 on the leeward side (6#, 7#, 8#) are farther from the cone apex. The axial distance between the pressure measuring grooves 101 on the windward and leeward sides is 5mm. When the aerodynamic angle is 0°, the middle pressure measuring groove 101 on the windward side should be directly facing the incoming flow. The other pressure measuring grooves 101 on the conical body are symmetrical along the center line of the pressure measuring groove 101. Therefore, under normal conditions, the pressure values ​​measured by two mutually symmetrical pressure measuring grooves 101 are consistent. When the aerodynamic angle changes, the pressure values ​​of each pressure measuring groove 101 symmetrical about the pressure measuring groove 101 change. The aerodynamic angle value can be deduced from the pressure difference of the symmetrical grooves.

[0030] In this embodiment, the air passage 102 inside the cone-shaped sensing part 1 consists of 8 independent and mutually airtight air passages 102. To avoid pressure signal delay and to have a certain capacity to accommodate foreign objects, the minimum diameter area of ​​the air passage 102 is 7.065 mm2 (equivalent to Φ3 mm cross-sectional area).

[0031] The product's icing protection uses armored heating wire 3 as the heating element. This heater operates at 115V, is double-wound, and is tightly bonded to the inside of the cone-shaped body via silver brazing. The heater is connected to the inside of the calculation component 2 using a miniaturized glass adapter 4.

[0032] The calculation component 2 consists of a pressure sensor 201 and a calculation circuit 202. The pressure measuring cone air path 102 transmits the measured pressure signals from various paths to the pressure sensor 201. The pressure sensor 201 converts the pressure signals into electrical signals and transmits them to the calculation circuit 202, thereby calculating the angle of attack. The pressure sensor 201 is arranged in a silicon piezoresistive sensor array. One high-precision silicon piezoresistive sensor serves as the self-test benchmark when the product starts working, namely the pressure self-test sensor 203. The other eight are conventional silicon piezoresistive sensors connected to the product air path 102. When the product starts, the eight conventional silicon piezoresistive sensors perform self-tests based on the high-precision silicon piezoresistive sensor.

[0033] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A solid-state pneumatic angle probe, characterized in that, The device includes a conical sensing part (1), on which pressure measuring grooves (101) are provided. There are 8 pressure measuring grooves (101), each of which is provided on the conical surface along the corresponding generatrix of the conical body. The 8 pressure measuring grooves (101) are evenly distributed around the conical sensing part (1). Each pressure measuring groove (101) is provided with an air passage (102) connected to a pressure sensor (201). One of the 8 pressure measuring grooves (101) faces the incoming flow direction, and the remaining pressure measuring grooves (101) are spatially symmetrically distributed with the central axis of the pressure measuring groove (101) facing the incoming flow direction as the axis of symmetry. The distance from the 3 pressure measuring grooves (101) facing away from the incoming flow direction to the cone apex is greater than the distance from the 5 pressure measuring grooves (101) facing the incoming flow direction to the cone apex.

2. The solid-state pneumatic angle probe according to claim 1, characterized in that, The cone apex of the cone-shaped sensor (1) is a spherical structure, and the spherical structure is tangent to the cone surface of the cone-shaped sensor (1).

3. The solid-state pneumatic angle probe according to claim 1, characterized in that, The cone-shaped sensing part (1) is located near the cone apex in a turbulence zone, and the pressure measuring groove (101) is located on the cone surface away from the turbulence zone at the cone apex.

4. The solid-state pneumatic angle probe according to claim 1, characterized in that, It also includes a calculation component (2), which includes a pressure sensor (201) and a calculation circuit (202). The pressure sensor (201) is used to communicate with the corresponding air path (102), and the calculation circuit (202) is used to receive the pressure signal collected by the pressure sensor (201) and calculate the angle of attack based on the pressure signal.

5. The solid-state pneumatic angle probe according to claim 4, characterized in that, It also includes a pressure self-test sensor (203), which is arranged with the eight pressure sensors (201) in a silicon piezoresistive sensor array. The pressure self-test sensor (203) is used to perform self-tests with the pressure self-test sensor (203) as a reference when the solid-state pneumatic angle probe is in operation.

6. The solid-state pneumatic angle probe according to any one of claims 1-5, characterized in that, The cone-shaped sensing part (1) has a hollow structure inside, and a heating wire (3) is installed on the inner surface of the cone-shaped sensing part (1).

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