Porous probe with anti-icing function

Abstract

The present application relates to the technical field of fluid measurement, and discloses a porous probe with anti-icing function, which comprises a pressure sensing probe, an air path support arm and an air path guide pipe, the pressure sensing probe is of a spherical structure, and a plurality of sensing holes are arranged on the outer wall surface of the pressure sensing probe, and each sensing hole is arranged on the windward surface of the pressure sensing probe. The pressure sensing probe is designed as a spherical structure, so that the measurement of a larger range of speed and direction can be achieved compared with the conical surface of a traditional five-hole probe. In addition, in order to avoid the influence of the vortex on the leeward surface of the spherical probe and the interference of the air path support arm on the flow field, the sensing holes are all arranged on the windward surface of the pressure sensing probe, so that the influence of the vortex on the leeward surface and the air path support arm on the flow field measurement is avoided, and more accurate and stable measurement results can be provided.

Description

Technical Field

[0001] The invention relates to the technical field of fluid measurement and discloses a porous probe with an anti-icing function. Background Art

[0002] During flight, aircraft require real-time measurement of their aerodynamic fields. This requires not only measuring the magnitude of the relative airflow velocity field but also determining the direction of the velocity to reflect the aircraft's flight attitude. Currently, multifunctional atmospheric data probes commonly used on aircraft include five-hole pressure probes, which use the pressure differential across the pressure holes to calculate flight speed, angle of attack, and sideslip angle. However, these probes have limited measurement accuracy and range. The pursuit of high maneuverability requires a wider range of flow field parameter calculations. Summary of the Invention

[0003] The purpose of the present invention is to provide a porous probe with anti-icing function, which can meet the measurement of speed and direction in a wider range, avoid the influence of leeward vortex and air path support arm on flow field measurement, and provide more accurate and stable measurement results.

[0004] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0005] A porous probe with anti-icing function, comprising:

[0006] The pressure-sensing probe is a spherical structure, and a plurality of sensing holes are provided on the outer wall of the pressure-sensing probe; each of the sensing holes is opened on the windward side of the pressure-sensing probe;

[0007] An air path support arm is provided with an air path channel, the number of which is the same as the number of the sensing holes; the pressure sensing probe is fixedly mounted on the cantilever end of the air path support arm, and each of the air path channels is connected to one of the sensing holes;

[0008] An air conduit is connected to each of the air channels, and the air conduit is used to guide the airflow introduced by the sensing hole to the pressure sensing end.

[0009] Furthermore, a reserved hole is provided in the airflow support arm, and the reserved hole extends from one end of the air path support arm away from the pressure sensing probe to the inside of the pressure sensing probe, and a heating component is inserted into the reserved hole.

[0010] Furthermore, the heating component is a PTC heating rod, and the gap between the PTC heating rod and the reserved hole is also filled with thermal conductive silica gel.

[0011] Furthermore, the number of the sensing holes is 13, one of which is a central hole, which is located at the center of the outer wall of the sensing hole and is used to sense the total pressure of the incoming flow in the direction of the incoming flow; the other 6 sensing holes are symmetrically distributed at the position where the spherical pressure distribution is equal to the static pressure of the incoming flow with the axis of the central hole as the center of symmetry, and are used to sense the static pressure value; the remaining 6 sensing holes are symmetrically distributed at the circumferential position of the maximum diameter of the pressure sensing probe with the axis of the central hole as the center of symmetry.

[0012] Furthermore, the six sensing holes for sensing the static pressure value and the six sensing holes located at the circumferential position of the maximum diameter are staggered along the circumference of the pressure sensing probe.

[0013] Furthermore, each sensing hole is drilled in a direction perpendicular to the spherical surface and is connected to a corresponding air path inside the pressure sensing probe.

[0014] Furthermore, the pressure sensing probe and the air path support arm are integrally formed using metal 3D printing technology.

[0015] Furthermore, the air conduit is inserted into the air passage at the tail end of the air support arm, and the air conduit is fixedly connected to the air passage by welding.

[0016] Compared with the existing technology, the beneficial effects of the present invention are: by designing the pressure sensing probe into a spherical shape, the present invention can meet the measurement of a wider range of speed and direction compared to the conical surface of the traditional five-hole probe; in addition, all the sensing holes are located on the windward side of the pressure sensing probe, avoiding the influence of leeward vortex and air path support arm on flow field measurement, and can provide more accurate and stable measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of a porous probe with anti-icing function in an embodiment;

[0018] Figure 2 Schematic diagram of the position of the center hole on the windward side of the pressure sensing probe in the embodiment;

[0019] Figure 3 for Figure 2 Schematic diagram of the left view structure;

[0020] Figure 4 for Figure 2 Schematic diagram of the right view structure;

[0021] Among them, 1. pressure probe; 2. sensing hole; 201. center hole; 3. air path support arm; 4. air path channel; 5. air path duct; 6. heating component. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the present invention to the following embodiments, as all technologies implemented based on the present invention fall within the scope of the present invention.

[0023] Example

[0024] See also Figure 1-Figure 4 , a porous probe with anti-icing function, comprising:

[0025] The pressure probe 1 is a spherical structure, and a plurality of sensing holes 2 are provided on the outer wall of the pressure probe 1; each of the sensing holes 2 is opened on the windward side of the pressure probe 1;

[0026] An air path arm 3 is provided with an air path channel, the number of which is the same as the number of the sensing holes 2; the pressure sensing probe 1 is fixedly mounted on the cantilever end of the air path arm 3, and each of the air paths is connected to one of the sensing holes 2;

[0027] An air conduit 4 is provided, and each of the air channels is connected to an air conduit 4 , and the air conduit 4 is used to guide the airflow introduced by the sensing hole 2 to the pressure sensing end.

[0028] In this embodiment, the pressure sensing probe 1 is designed to be spherical, which can meet the measurement of speed and direction in a wider range compared to the conical surface of the traditional five-hole probe; in addition, in order to avoid the influence of the vortex on the leeward side of the spherical probe and the interference of the air path arm 3 on the flow field, all the sensing holes 2 are located on the windward side of the pressure sensing probe 1, avoiding the influence of the vortex on the leeward side and the interference of the air path arm 3 on the flow field measurement, and can provide more accurate and stable measurement results.

[0029] In addition, the increase in the number of holes complicates the design and processing of the probe structure. Furthermore, during ice wind tunnel testing, existing multi-hole probes are prone to ice formation because they rarely have a heating function. Once the pressure-sensing holes are clogged, they cannot correctly sense the flow field information, causing errors in the measurement. For this reason, in this embodiment, a reserved hole is provided in the airflow support arm. The reserved hole extends from the end of the airway support arm 3 away from the pressure-sensing probe 1 into the pressure-sensing probe 1, and a heating component 5 is inserted into the reserved hole. The heating component 5 is capable of heating the pressure-sensing probe 1 and performing effective, real-time temperature control on the pressure-sensing probe 1, avoiding the cumbersome need for external temperature control circuits to achieve temperature control in traditional heating methods. The simple structure and high reliability enable the multi-hole probe to meet the anti-icing requirements in extreme environments, thereby effectively preventing the cold airflow from freezing when passing through the sensing hole 2 during ice wind tunnel testing, ensuring that the sensing hole 2 of the probe is always unobstructed. The heating component 5 in this embodiment is a PTC heating rod, and the gap between the PTC heating rod and the reserved hole is also filled with thermally conductive silicone; the thermally conductive silicone has good thermal conductivity and can evenly transfer the heat generated by the PTC heating rod to various parts of the pressure sensing probe 1, thereby ensuring uniform temperature distribution of the entire pressure sensing probe 1 and preventing local overheating or freezing.

[0030] In this embodiment, the number of the sensing holes 2 is 13, one of which is a center hole 201. The center hole 201 is located at the center of the outer wall of the sensing hole 2 and is used to sense the total pressure of the incoming flow in the direction of the incoming flow. The other six sensing holes 2 are symmetrically distributed at the position where the spherical pressure distribution is equal to the static pressure of the incoming flow, with the axis of the center hole 201 as the center of symmetry. They are used to sense the static pressure value and reduce the error of the static pressure measurement. The remaining six sensing holes 2 are symmetrically distributed at the circumferential position of the maximum diameter of the pressure sensing probe 1 with the axis of the center hole 201 as the center of symmetry. The joint decoupling of the two rows of static pressure holes can solve the angle measurement with a larger range and higher accuracy. In this embodiment, the six sensing holes 2 used to sense the static pressure value and the six sensing holes 2 located at the circumferential position of the maximum diameter are staggered along the circumference of the pressure sensing probe 1.

[0031] Each sensing hole 2 is drilled perpendicular to the spherical surface and connects to the corresponding air passage inside the pressure probe 1. The pressure probe 1 and air passage arm 3 are integrally formed using metal 3D printing technology. A certain margin is left in the outer dimensions of the pressure probe 1 and the air passage arm 3, and additional machining is performed to ensure the roughness of the pressure probe 1. The pressure probe 1 is spherical, and the air passage inside the probe is also 3D printed to reduce machining complexity. A catheter is inserted into the air passage at the bottom of the air passage arm 3 and connected by welding.

[0032] The above are only 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 in the scope of protection of the present invention.

Claims

1. A porous probe with anti-icing function, characterized in that: include: A pressure probe (1) is a spherical structure, and a plurality of sensing holes (2) are provided on the outer wall of the pressure probe (1); each of the sensing holes (2) is opened on the windward side of the pressure probe (1); the number of the sensing holes (2) is 13, one of the sensing holes (2) is a central hole (201), and the central hole (201) is located at the center of the outer wall of the sensing hole (2), and is used to sense the total pressure of the incoming flow in the direction of the incoming flow; the other six sensing holes (2) are symmetrically distributed at positions where the spherical pressure distribution is equal to the static pressure of the incoming flow, with the axis of the central hole (201) as the center of symmetry, and are used to sense the static pressure value; the remaining six sensing holes (2) are symmetrically distributed at the circumferential position of the maximum diameter of the pressure probe (1) with the axis of the central hole (201) as the center of symmetry. An air path support arm (3) is provided with air path channels in the air path support arm (3), and the number of the air path channels is the same as the number of the sensing holes (2); the pressure sensing probe (1) is fixedly mounted on the cantilever end of the air path support arm (3), and each of the air path channels is communicated with one of the sensing holes (2); An air conduit (4), each of the air passages is connected to an air conduit (4), and the air conduit (4) is used to guide the airflow introduced by the sensing hole (2) to the pressure sensing end.

2. The porous probe with anti-icing function according to claim 1, characterized in that: A reserved hole is also provided in the air path support arm (3), and the reserved hole extends from one end of the air path support arm (3) away from the pressure sensing probe (1) to the inside of the pressure sensing probe (1), and a heating component (5) is inserted into the reserved hole.

3. The multi-hole probe with anti-icing function according to claim 2, characterized in that: The heating component (5) is a PTC heating rod, and the gap between the PTC heating rod and the reserved hole is also filled with heat-conducting silica gel.

4. The porous probe with anti-icing function according to claim 1, characterized in that: The six sensing holes (2) for sensing static pressure values ​​and the six sensing holes (2) located at the circumferential position of the maximum diameter are staggered and distributed along the circumference of the pressure sensing probe (1).

5. The porous probe with anti-icing function according to any one of claims 1 to 4, characterized in that: Each sensing hole (2) is punched in a direction perpendicular to the spherical surface and is connected to a corresponding air passage inside the pressure sensing probe (1).

6. The multi-hole probe with anti-icing function according to claim 5, characterized in that: The pressure sensing probe (1) and the air path support arm (3) are integrally formed using metal 3D printing technology.

7. The multi-hole probe with anti-icing function according to claim 5, characterized in that: The air path conduit (4) is inserted into the air path passage at the tail end of the air path support arm (3), and the air path conduit (4) is fixedly connected to the air path passage by welding.

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