Porous probe with anti-icing function

Abstract

The invention relates to the technical field of fluid measurement, and discloses a porous probe with an ice melting prevention function, the porous probe comprises a pressure sensing probe, a gas path support arm and a gas path guide pipe, the pressure sensing probe is of a spherical structure, a plurality of sensing holes are formed in the outer wall surface of the pressure sensing probe, and each sensing hole is formed in the windward side of the pressure sensing probe. The pressure sensing probe is designed to be spherical, and compared with a traditional five-hole probe with a conical profile, the pressure sensing probe can meet measurement of the speed and the direction in a larger range; besides, in order to avoid the influence of the leeside vortex of the spherical probe and the interference of the gas path support arm on the flow field, the sensing holes are all positioned on the windward side of the pressure sensing probe, so that the influence of the leeside vortex and the gas path support arm on the measurement of the flow field is avoided, and a more accurate and stable measurement result 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 the flight, the aircraft needs to measure its aerodynamic field in real time. It is necessary not only to measure the magnitude of the relative airflow velocity field velocity, but also to determine the direction of the velocity to reflect its flight attitude. Currently, the commonly used multifunctional atmospheric data probes for aircraft include five-hole pressure probes, which use the pressure difference of the pressure holes to calculate the flight speed, angle of attack and sideslip angle. However, the measurement accuracy and range of the five-hole pressure probes are limited. With the pursuit of high maneuverability, a wider range of flow field parameter solutions is required. Summary of the invention

[0003] The purpose of the present invention is to provide a porous probe with an anti-icing function, which can meet the measurement of a wider range of speeds and directions, avoid the influence of leeward vortices and air path branches 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 arranged on the outer wall of the pressure sensing probe; each of the sensing holes is opened on the windward surface of the pressure sensing probe;

[0007] An air path support arm, wherein an air path channel is provided in the air path support arm, and the number of the air path channels 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 communicated with one of the sensing holes;

[0008] An air conduit, each of the air passages is connected to an air conduit, 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 in 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 staggeredly distributed 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 path conduit is inserted into the air path channel at the rear end of the air path support arm, and the air path conduit is fixedly connected to the air path channel by welding.

[0016] Compared with the prior art, the present invention has the following beneficial effects: the present invention designs the pressure sensing probe to be spherical, which 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 an 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 A right view structural diagram of ;

[0021] Among them, 1. pressure sensing 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 is further described in detail below in conjunction with the embodiments and drawings. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0023] Example

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

[0025] A pressure sensing probe 1, which is a spherical structure, has a plurality of sensing holes 2 on its outer wall; each of the sensing holes 2 is opened on the windward side of the pressure sensing probe 1;

[0026] An air path support arm 3, wherein an air path channel is provided 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;

[0027] An air conduit 4 , each of the air passages is connected with 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 branch 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 branch 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 will make the probe structure design and processing more complicated, and during the ice wind tunnel test, the existing porous probes are very easy to freeze because they rarely have a heating function. Once the pressure-sensing hole is blocked, it is impossible to correctly sense the flow field information, which causes errors in the measurement. Based on this, in this embodiment, a reserved hole is opened in the airflow support arm, and the reserved hole extends from the end of the air path support arm 3 away from the pressure-sensing probe 1 to the pressure-sensing probe 1, and a heating component 5 is inserted in the reserved hole. The heating component 5 can heat the pressure-sensing probe 1, and can effectively and real-timely control the temperature of the pressure-sensing probe 1, avoiding the cumbersomeness of the traditional heating method to achieve temperature control by an external temperature control circuit. It has a simple structure and high reliability, and can meet the anti-icing requirements of the porous probe in extreme environments, thereby effectively avoiding the freezing of the cold airflow when passing through the sensing hole 2 during the ice wind tunnel test, 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 thermal conductive silicone; the thermal 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, and 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 6 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, and are used to sense the static pressure value, and can reduce the error of static pressure measurement. The remaining 6 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 punched perpendicular to the spherical surface and connected to the corresponding gas path inside the pressure probe 1. The pressure probe 1 and the gas path arm 3 are integrally formed using metal 3D printing technology. A certain margin is left for the outer dimensions of the pressure probe 1 and the gas path arm 3, and the roughness of the pressure probe 1 is ensured through supplementary processing; the pressure probe 1 is spherical, and the gas path inside the probe is also completed through 3D printing to reduce the difficulty of machining. The catheter is inserted into the gas path at the bottom of the gas path 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 protection scope of the present invention.

Claims

1. A porous probe with anti-icing function, characterized in that: include: A pressure sensing probe (1), the pressure sensing probe (1) being of a spherical structure, and a plurality of sensing holes (2) being arranged on the outer wall surface of the pressure sensing probe (1); each of the sensing holes (2) being arranged on the windward surface of the pressure sensing probe (1); An air path support arm (3), wherein an air path channel is provided 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 airflow support arm, and the reserved hole extends from one end of the airway 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 in the reserved hole.

3. The porous 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 filled with thermally conductive silica gel.

4. The porous probe with anti-icing function according to claim 1, characterized in that: The number of the sensing holes (2) is 13, one of which 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 evenly 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 symmetry center, and are used to sense the static pressure value; the remaining six sensing holes (2) are evenly distributed at the circumferential position of the maximum diameter of the pressure sensing probe (1), with the axis of the central hole (201) as the symmetry center.

5. The porous probe with anti-icing function according to claim 4, 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 staggeredly distributed along the circumference of the pressure sensing probe (1).

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

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

8. The porous probe with anti-icing function according to claim 6, characterized in that: The air path conduit (4) is inserted into the air path passage at the rear 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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