Total static pressure probe with temperature measurement function

Abstract

The invention discloses a total static pressure probe with a temperature measuring function, which comprises an end part, a static pressure tube, a total pressure tube, an aviation plug connector, a ferrule connector and a mounting seat, a groove is formed in an air flow stagnation area of the end part, an insulating layer is plated in the groove, a thin film platinum resistor is plated on the insulating layer, the line type of the thin film platinum resistor is snake-shaped, the end part is welded with the total pressure tube and the static pressure tube, and the end part is welded with the aviation plug connector and the ferrule connector. The total pressure pipe is inserted into the static pressure pipe and located in the center of the static pressure pipe, a static pressure hole is formed in the wall face of the static pressure pipe, the static pressure pipe is bent by 90 degrees to form a transverse rod part and a vertical rod part, the clamping sleeve connector, the aviation plug connector and the installation base are welded to the lower end of the vertical rod part, the total pressure pipe and the static pressure pipe are synchronously bent by 90 degrees, and the molded surfaces of the ends are 1 / 4 oval molded surfaces. According to the invention, the total pressure, static pressure and temperature of airflow can be measured at the same time, the pneumatic stability of the test room can be monitored, whether gas backflow occurs during engine test can be monitored, and the flow field condition in the test room can be mastered in time.

Description

Technical Field

[0001] The invention belongs to the technical field of flow field testing, and in particular relates to a total static pressure probe with a temperature measuring function. Background Art

[0002] The aircraft engine test bench is an important test platform for obtaining engine performance parameters such as engine thrust. From development, production, delivery to use and maintenance, the engine needs to undergo a large number of whole-machine tests and tests. It is often necessary to record data on the test benches of different factories, institutes, and user units to determine the long-term stability or consistency of engine performance. The stable aerodynamic flow field in the test shop is the basis for ensuring the accuracy and consistency of engine performance parameter measurement and evaluation. At present, most test shops are not equipped with aerodynamic stability monitoring devices, which is not conducive to timely grasping the flow field conditions in the test shop during engine testing. Summary of the invention

[0003] The purpose of the present invention is to provide a total static pressure probe with a temperature measurement function, which can realize aerodynamic stability monitoring and gas reflux monitoring in a test chamber, and is conducive to timely grasping the flow field conditions in the test chamber.

[0004] In order to achieve the above-mentioned purpose, one aspect of the present invention provides a total static pressure probe with a temperature measurement function, comprising an end, a static pressure pipe, a total pressure pipe, an aviation plug joint, a ferrule joint and a mounting seat, a groove is provided in the airflow stagnation area of ​​the end, an insulating layer is plated in the groove, a thin film platinum resistor is plated on the insulating layer, and the line shape of the thin film platinum resistor is serpentine, the end is welded to the total pressure pipe and the static pressure pipe, the total pressure pipe is inserted into the static pressure pipe and is located at the center of the static pressure pipe, a static pressure hole is provided on the wall of the static pressure pipe, the static pressure pipe is bent 90° to form a horizontal bar part and a vertical bar part, the ferrule joint, the aviation plug joint and the mounting seat are respectively welded to the lower end of the vertical bar part, and the total pressure pipe and the static pressure pipe are synchronously bent 90°;

[0005] The profile of the end adopts a 1 / 4 elliptical profile, and the profile curve equation is as follows:

[0006]

[0007] Among them, x is the horizontal coordinate and y is the vertical coordinate;

[0008] a is the major radius of the ellipse, a = 1.5 ~ 2.5d, d is the outer diameter of the static pressure tube, d = 5 ~ 1 0mm;

[0009] b is the minor radius of the ellipse,

[0010] c is the inner diameter of the total pressure pipe, c=0.5~2mm.

[0011] Preferably, the distance from the center line of the static pressure hole to the end is 3d, the distance from the center line of the static pressure hole to the center line of the vertical rod part is 7.5d, the diameter of the static pressure hole is 0.5-1mm, the number is 6-8, and the center line of the static pressure hole is perpendicular to the wall of the static pressure pipe.

[0012] Preferably, the thin film platinum resistor is obtained by the following plating process:

[0013] Clean the surface of the end groove to ensure a smooth surface;

[0014] An insulating layer is plated on the surface of the end groove by magnetron sputtering, and the thickness of the insulating layer is the minimum thickness that can achieve the insulating effect;

[0015] A thin film platinum resistor layer is plated on the insulating layer by magnetron sputtering, a photolithography plate is made according to the line shape of the thin film platinum resistor, and then the line shape of the thin film platinum resistor is washed out by a chemical wash.

[0016] Preferably, the surface roughness of the end groove does not exceed Ra0.1, and the material of the insulating layer is selected from Al2O3 or Si3N4.

[0017] Preferably, the surface roughness of the end groove is Ra0.08, the material of the insulating layer is Al2O3, and the thickness of the insulating layer is 9 μm.

[0018] Preferably, the thickness of the thin film platinum resistor layer is 400 nm, and the thin film platinum resistor line is washed out with acetone, and the line width of the thin film platinum resistor is 0.05 mm.

[0019] Preferably, the plating area of ​​the thin film platinum resistor does not exceed 1.5 mm×1 mm.

[0020] The total static pressure probe with temperature measurement function according to the above aspect of the present invention can realize aerodynamic stability monitoring and gas reflux monitoring in the test chamber, which is conducive to timely understanding of the flow field conditions in the test chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0022] Figure 1 is a schematic structural diagram of a total static pressure probe with a temperature measurement function according to an embodiment of the present invention;

[0023] Figure 2 is a cross-sectional view of a total static pressure probe with a temperature measurement function according to an embodiment of the present invention;

[0024] Figure 3 is a cross-sectional view of an end portion of an embodiment of the present invention;

[0025] Figure 4 is a position diagram of a thin film platinum resistor according to an embodiment of the present invention;

[0026] Figure 5 is a profile diagram of an end portion of an embodiment of the present invention;

[0027] Figure 6 FIG. 4 is a line graph of a thin film platinum resistor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The embodiment of the present invention provides a total static pressure probe with a temperature measurement function, such as Figure 1 to Figure 4 As shown, the total static pressure probe with temperature measurement function of the embodiment of the present invention includes an end 1, a static pressure pipe 2, a total pressure pipe 3, an aviation plug joint 4, a ferrule joint 5, and a mounting seat 6. The airflow stagnation area of ​​the end 1 is provided with a groove, and an insulating layer 8 is plated in the groove, and a thin film platinum resistor 7 is plated on the insulating layer 8. A static pressure hole 9 is provided on the wall of the static pressure pipe 2. The end 1 is first welded to the total pressure pipe 3, and then inserted into the static pressure pipe 2 with the static pressure hole 9, and then welded to the end of the static pressure pipe 2. The total pressure pipe 3 is at the center of the static pressure pipe 2. The static pressure pipe 2 is bent 90° to form a horizontal bar part and a vertical bar part. The lower end of the vertical bar part of the static pressure pipe 2 is respectively welded with the aviation plug joint 4, the ferrule joint 5 and the mounting seat 6. The total pressure pipe 3 and the static pressure pipe 2 are synchronously bent 90°. The aviation plug joint 4 is a platinum resistor lead aviation plug joint, which is used to connect the total static pressure probe and the measuring equipment. The ferrule joint 5 is a total static pressure pipe ferrule joint, which is used to connect the total static pressure probe and the fluid transmission system. The mounting seat 6 is used to mount the total static pressure probe at a measuring position.

[0030] like Figure 5 As shown, the profile of the end 1 adopts a 1 / 4 elliptical profile, and the profile curve equation is as follows:

[0031]

[0032] in,

[0033] x is the horizontal axis,

[0034] y is the vertical coordinate,

[0035] a is the major radius of the ellipse, a = (1.5-2.5) d, d is the outer diameter of the probe, that is, the outer diameter of the static pressure tube 2, d = (5-10) mm;

[0036] b is the minor radius of the ellipse,

[0037] c is the total pressure measuring hole diameter, that is, the inner diameter of the total pressure pipe 3, c = (0.5 ~ 2) mm.

[0038] In one embodiment, the outer diameter d of the probe is 8 mm, the major radius a of the ellipse is 6.5 mm, the minor radius b is 3.5 mm, and the total pressure hole diameter c is 1 mm. Then, the profile curve equation of the end 1 is:

[0039]

[0040] The static pressure hole 9 is located at the end of the static pressure pipe 2, the distance from the center line of the static pressure hole 9 to the air inlet of the end 1 is 3d, the distance from the center line of the static pressure hole 9 to the center line of the vertical rod part of the static pressure pipe 2 is 7.5d, the diameter of the static pressure hole 9 is e = (0.5 ~ 1) mm, the number n = (6 ~ 8), the edge of the static pressure hole 9 is sharp, smooth and has no burrs, and the center line of the static pressure hole 9 is perpendicular to the center line of the horizontal rod part of the static pressure pipe 2.

[0041] In one embodiment, the distance from the center line of the static pressure hole 9 to the end is 24 mm, the distance from the center line of the static pressure hole 9 to the center line of the vertical rod part of the static pressure pipe 2 is 60 mm, the diameter e of the static pressure hole 9 is 0.8 mm, and the number n is 8.

[0042] In the airflow stagnation area of ​​the end 1, a thin film platinum resistor 7 is plated by magnetron sputtering, and the area of ​​the plated thin film platinum resistor 7 does not exceed 1.5mm×1mm. In one embodiment, the plated thin film platinum resistor 7 has a line width of 0.05mm, a film thickness of 400nm, a resistance value of 100Ω, and a plated area of ​​1.4mm×1mm.

[0043] like Figure 6 As shown in the embodiment, the line shape of the thin film platinum resistor 7 is serpentine. During plating, the resistance of the thin film platinum resistor 7 is controlled at a constant value by the line width, line length and film thickness, and has good repeatability.

[0044] The plating process of the thin film platinum resistor 7 includes steps S1 to S4.

[0045] Step S1: The surface roughness of the end groove does not exceed Ra0.1, and the end groove is cleaned to ensure a smooth surface. Preferably, the surface roughness of the end groove is Ra0.08.

[0046] Step S2: an insulating layer is plated on the surface of the end groove by magnetron sputtering, and an insulating material such as Al2O3 or Si3N4 is selected, and the film thickness is the minimum thickness that can achieve the insulating effect (not less than 100MΩ). Preferably, Al2O3 material is selected, and the film thickness is 9μm.

[0047] Step S3: A thin film platinum resistor layer is plated on the insulating layer by magnetron sputtering, a photolithography plate is made according to the line shape of the thin film platinum resistor, and then the line shape of the thin film platinum resistor is washed out by a chemical detergent. Preferably, the film thickness is 400nm, acetone is used to wash out the line shape of the thin film platinum resistor, and the line width of the sensing part of the thin film platinum resistor is 0.05mm.

[0048] The total static pressure probe with temperature measurement function in the embodiment of the present invention is calibrated, and the obtained Pitot tube coefficient is 0.999 in the range of 0m / s to 25m / s, which meets the standard Pitot tube coefficient requirement.

[0049] The total static pressure probe with temperature measurement function in the above embodiment of the present invention can simultaneously measure the total pressure, static pressure and effective temperature of the airflow. In the aerodynamic stability monitoring system of the test workshop, the intake pressure loss, pressure drop, etc. can be analyzed and calculated by measuring the total static pressure difference of different cross sections, and at the same time, it can monitor whether the gas reflux occurs during the engine test, which can be further extended to occasions where the airflow pressure and temperature need to be measured simultaneously.

[0050] The total static pressure probe with temperature measurement function according to the embodiment of the present invention has the following beneficial effects:

[0051] 1. By designing a new end profile curve, the airflow disturbance is effectively reduced, and the applicability of the probe to different flow fields is improved;

[0052] 2. By plating a thin film platinum resistor in the airflow stagnation area, real-time measurement of the effective temperature of the airflow can be achieved;

[0053] 3. On the basis of achieving the above beneficial effects 1 and 2, it can simultaneously realize the real-time measurement of airflow velocity and airflow temperature, and provide experimental data support for the aerodynamic stability monitoring and gas reflux monitoring in the test workshop;

[0054] 4. The present invention has the advantages of compact structure and easy installation, which greatly saves installation space.

[0055] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A total static pressure probe with temperature measurement function, characterized in that: It includes an end, a static pressure pipe, a total pressure pipe, an aviation plug joint, a ferrule joint and a mounting seat. A groove is provided in the airflow stagnation area of ​​the end. An insulating layer is plated in the groove. A thin film platinum resistor is plated on the insulating layer. The line type of the thin film platinum resistor is serpentine. The end is welded to the total pressure pipe and the static pressure pipe. The total pressure pipe is inserted into the static pressure pipe and is located at the center of the static pressure pipe. A static pressure hole is provided on the wall of the static pressure pipe. The static pressure pipe is bent 90° to form a horizontal bar part and a vertical bar part. The ferrule joint, the aviation plug joint and the mounting seat are respectively welded to the lower end of the vertical bar part. The total pressure pipe and the static pressure pipe are synchronously bent 90°. The profile of the end adopts a 1 / 4 elliptical profile, and the profile curve equation is as follows: Among them, x is the horizontal coordinate and y is the vertical coordinate; a is the major radius of the ellipse, a = 1.5 ~ 2.5d, d is the outer diameter of the static pressure tube, d = 5 ~ 1 0mm; b is the minor radius of the ellipse, c is the inner diameter of the total pressure pipe, c=0.5~2mm.

2. The total static pressure probe according to claim 1, characterized in that: The distance from the center line of the static pressure hole to the end is 3d, the distance from the center line of the static pressure hole to the center line of the vertical rod part is 7.5d, the diameter of the static pressure hole is 0.5~1mm, the number is 6~8, and the center line of the static pressure hole is perpendicular to the wall of the static pressure pipe.

3. The total static pressure probe according to claim 1 or 2, characterized in that: Thin film platinum resistors are obtained through the following plating process: Clean the surface of the end groove to ensure a smooth surface; An insulating layer is plated on the surface of the end groove by magnetron sputtering, and the thickness of the insulating layer is the minimum thickness that can achieve the insulating effect; A thin film platinum resistor layer is plated on the insulating layer by magnetron sputtering, a photolithography plate is made according to the line shape of the thin film platinum resistor, and then the line shape of the thin film platinum resistor is washed out by a chemical wash.

4. The total static pressure probe according to claim 3, characterized in that: The surface roughness of the end groove does not exceed Ra0.1, and the material of the insulating layer is selected from Al2O3 or Si3N4.

5. The total static pressure probe according to claim 4, characterized in that: The surface roughness of the end groove is Ra0.08, the material of the insulating layer is Al2O3, and the thickness of the insulating layer is 9 μm.

6. The total static pressure probe according to claim 3, characterized in that: The thickness of the thin film platinum resistor layer is 400 nm. The thin film platinum resistor line is washed out with acetone. The line width of the thin film platinum resistor is 0.05 mm.

7. The total static pressure probe according to claim 3, characterized in that: The plating area of ​​the thin film platinum resistor does not exceed 1.5mm×1mm.

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