Supporting tool and calibration method for calibration of flow meter in hang-off test

Abstract

The invention provides a hanging flight test flowmeter calibration supporting tool and a calibration method.The hanging flight test flowmeter calibration supporting tool comprises a base, a metal level bubble and a mounting bracket, the base is provided with a mounting top face, the metal level bubble is mounted on the mounting top face, and the metal level bubble is used for detecting the levelness of the mounting top face; therefore, the installation top surface is horizontal. The installation support is installed on the installation top face, the installation support is provided with the installation inclined face, the installation inclined face is used for installing and fixing the flow meter, on one hand, it is guaranteed that the flow meter is effectively fixed, and on the other hand, the flow meter is located at a preset angle. The angle where the flowmeter is located is the inclination angle of the installation inclined face, and therefore it is guaranteed that the flowmeter is located at the installation angle during actual hanging flight test detection when being calibrated, and the accuracy of measured data is guaranteed when the calibrated flowmeter is used for fuel oil measurement in a hanging flight test.

Description

Technical Field

[0001] This invention relates to the field of flowmeter calibration technology, and more specifically, to a calibration support fixture and calibration method for a flowmeter used in flight testing. Background Technology

[0002] In aero-engines, fuel flow rate is one of the important parameters for monitoring fuel consumption, engine performance, and stability, and its measurement results are particularly crucial for evaluating the overall engine performance. Currently, fuel flow rate parameters in aero-engine flight tests are measured using a fuel flow rate measurement system with piping on the engine side. To ensure the accuracy of this system, calibration is necessary, especially for the flow meters within it.

[0003] However, the inventors discovered that the existing flow meter calibration for aircraft engine flight tests is often performed with reference to JJG103. This calibration process is only performed under 0° horizontal installation. However, the actual installation angle of the flow meter in flight tests is often not horizontal. The installation angle has a significant impact on the measurement accuracy of the fuel measurement system, resulting in a large error in the measurement data obtained by the calibrated flow meter when measuring fuel flow. Summary of the Invention

[0004] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0005] The purpose of this invention is to provide a calibration support fixture for a flow meter used in flight tests, which can improve the technical problem that the data measured by the calibrated flow meter still has a large error when used for fuel measurement in flight tests.

[0006] The present invention also aims to provide a method for calibrating a flow meter for flight testing, which can improve the technical problem in the prior art that the data measured by the calibrated flow meter still has a large error when used for fuel measurement in flight testing.

[0007] Embodiments of the present invention can be implemented in the following ways:

[0008] A calibration support fixture for a flow meter undergoing a flight test is provided for mounting the flow meter to be calibrated. The calibration support fixture includes:

[0009] The base has a mounting top surface;

[0010] A metal spirit level mounted on the mounting surface, the metal spirit level being used to detect the levelness of the mounting surface to ensure that the mounting surface is level; and

[0011] A mounting bracket is installed on the mounting top surface. The mounting bracket has a mounting slope for mounting and fixing the flow meter, and so that the flow meter is at a preset angle; wherein, the preset angle is the inclination angle of the mounting slope.

[0012] Optionally, the calibration support fixture for the test flowmeter further includes an adjustable foot cup disposed below the base. The adjustable foot cup includes a foot cup body and an adjusting screw. The adjusting screw is connected to the base, and the foot cup body is screwed to the adjusting screw, so that the height of the base is adjustable.

[0013] Optionally, there may be multiple adjustable feet, all of which are located below the base, so that the levelness of the mounting top surface can be adjusted by adjusting the height of the adjustable feet.

[0014] Optionally, the calibration support fixture for the flight test flow meter further includes an oil inlet pipe assembly, one end of which is connected to the flow station, and the other end of which is connected to the flow meter to deliver calibration fluid from the flow station to the flow meter.

[0015] Optionally, the oil inlet pipe assembly includes a pipe support and an interconnected rigid oil inlet pipe and a flexible oil inlet pipe. The end of the rigid oil inlet pipe away from the flexible oil inlet pipe is used to communicate with the flow meter, and the end of the flexible oil inlet pipe away from the rigid oil inlet pipe is used to communicate with the flow meter. The pipe support is used to support the rigid oil inlet pipe and to adjust the height of the rigid oil inlet pipe so that the flexible oil inlet pipe is coaxial with the flow meter.

[0016] Optionally, the oil inlet hose is wrapped with an insulation layer.

[0017] Optionally, the oil inlet pipe assembly further includes a temperature transmitter, which is mounted on the rigid oil inlet pipe, and the connection between the pipe support and the rigid oil inlet pipe is located on the side of the temperature transmitter away from the flexible oil inlet pipe.

[0018] Optionally, the calibration support fixture for the test flow meter further includes an oil outlet pipe assembly, which includes an oil outlet hose. One end of the oil outlet pipe assembly is used to communicate with the flow station, and the other end of the oil outlet pipe assembly is used to communicate with the flow meter, so as to guide the calibration liquid oil flowing through the flow meter back to the flow station.

[0019] Optionally, the inclination angle of the mounting ramp is 29.2°.

[0020] A method for calibrating a flow meter for a fly-off test, the method comprising:

[0021] The flow meter is installed on the mounting slope of the mounting bracket so that the flow meter is at a preset angle; wherein, the mounting bracket is set on the mounting top surface of the base, the mounting top surface is adjusted to be horizontal according to the metal spirit level, and the preset angle is the tilt angle of the mounting slope when the mounting top surface is horizontal;

[0022] The flow meter is calibrated.

[0023] The beneficial effects of the calibration support fixture and calibration method for the fly test flowmeter provided in the embodiments of the present invention include:

[0024] This invention provides a calibration support fixture for a flow meter used in flight tests. The fixture includes a base, a metal spirit level, and a mounting bracket. The base has a mounting top surface, and the metal spirit level is mounted on this surface to check its levelness. The mounting bracket, which has an inclined surface, is used to mount and fix the flow meter. This ensures effective fixation of the flow meter and positions it at a preset angle. Since the mounting top surface is horizontal, the angle at which the flow meter is mounted on the inclined surface is the inclination angle of the inclined surface. In other words, the inclination angle of the inclined surface can be set according to the actual installation requirements of the flow meter, ensuring that the flow meter is at the same installation angle used in actual flight tests during calibration. This avoids the impact of angle changes on detection accuracy and guarantees the accuracy of the data measured by the calibrated flow meter when used for fuel measurement in flight tests.

[0025] An embodiment of the present invention provides a method for calibrating a flow meter for flight testing, comprising mounting the flow meter on an inclined mounting surface of a mounting bracket so that the flow meter is at a preset angle; wherein, the mounting bracket is disposed on the top mounting surface of a base, the top mounting surface is adjusted to be horizontal according to a metal spirit level, and the preset angle is the inclination angle of the inclined mounting surface when the top mounting surface is horizontal; and calibrating the flow meter. Because the flow meter is installed at a preset angle during calibration, the accuracy of the data measured by the calibrated flow meter when used for fuel measurement in flight testing can be guaranteed. Attached Figure Description

[0026] The above-described features and advantages of the present invention will be better understood after reading the following detailed description of embodiments of the present disclosure in conjunction with the accompanying drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related properties or features may have the same or similar reference numerals.

[0027] Figure 1 A schematic diagram of the structure of the test flowmeter calibration support tool according to one aspect of the present invention is shown from a first perspective;

[0028] Figure 2 A schematic diagram of the structure of the test flowmeter calibration support tool according to one aspect of the present invention is shown from a second perspective.

[0029] Figure label:

[0030] 100-Calibration support fixture for the test flowmeter; 110-Base; 111-Base plate; 112-Column; 113-Mounting plate; 114-Hex socket head cap screw; 115-Mounting top surface; 116-Metal spirit level; 120-Adjusting feet; 121-Adjusting screw; 122-Foot body; 130-Mounting bracket; 131-Frame; 132-Fixing plate; 133-Mounting ramp; 134-Fasteners; 140-Inlet pipe assembly; 141 142-First oil inlet; 143-Rigid oil inlet pipe; 144-Hose inlet; 145-Temperature transmitter; 146-Pipeline support; 1461-First support section; 1462-First pin hole; 1463-Second support section; 1464-Second pin hole; 1465-Third support section; 150-Oil outlet pipe assembly; 151-Oil outlet hose; 152-Second oil inlet; 153-Second oil outlet; 154-Rigid oil outlet pipe;

[0031] 200-Flow Meter. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0033] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," "outer," or "vertical" appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use, and does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0034] At the same time, it should be noted that the terms "first" and "second" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0035] In the description of this invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components, etc. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In the description of this invention, "airborne test" refers to a flight test conducted in a real flight environment to verify the performance characteristics, working quality and reliability of the engine and its various systems and accessories when the engine is installed on an aircraft, or to complete a predetermined research project.

[0037] Figure 1 This is a schematic diagram of the calibration support fixture 100 for the flight test flowmeter provided in this embodiment from a first-view perspective. Figure 2 This is a schematic diagram of the structure of the flowmeter calibration support fixture 100 provided in this embodiment from a second perspective, specifically a top-down view. Please refer to the reference diagram. Figure 1 and Figure 2 This embodiment provides a calibration support fixture 100 for a test flow meter, which includes a base 110, a metal spirit level 116, and a mounting bracket 130. The base 110 has a mounting top surface 115, and the metal spirit level 116 is mounted on the mounting top surface 115. The metal spirit level 116 is used to detect the levelness of the mounting top surface 115 to ensure that the mounting top surface 115 is level. Mounting bracket 130 is mounted on mounting top surface 115. Mounting bracket 130 has mounting ramp 133, which is used to mount and fix flow meter 200. On the one hand, it ensures effective fixation of flow meter 200, and on the other hand, it ensures that flow meter 200 is at a preset angle. Since mounting top surface 115 is horizontal, the angle of flow meter 200 after it is mounted on mounting ramp 133 is the tilt angle of mounting ramp 133. In other words, the tilt angle of mounting ramp 133 can be set according to the actual installation requirements of flow meter 200, thereby ensuring that the flow meter 200 is at the installation angle used in the actual flight test when it is calibrated. This avoids the impact of angle changes on the detection accuracy and ensures the accuracy of the data measured by the calibrated flow meter 200 when it is used for fuel measurement in the flight test.

[0038] The following embodiment provides a further explanation of the calibration support fixture 100 for the flight test flowmeter:

[0039] Please continue to refer to Figure 1 and Figure 2In this embodiment, the base 110 includes a base plate 111, a mounting plate 113, and columns 112. Multiple columns 112 are supported between the base plate 111 and the mounting plate 113, fixing the base plate 111 and the mounting plate 113 into a single unit. Specifically, the upper and lower ends of the columns 112 are fixedly connected to the base plate 111 and the mounting plate 113, respectively. The upper end of the column 112 can be used to fix the mounting plate 113 to the column 112 using hexagonal head screws 114. The upper end face of the mounting plate 113 forms a mounting top surface 115, and the mounting bracket 130 is fixedly mounted above the mounting plate 113.

[0040] Furthermore, the calibration support fixture 100 for the flight test flowmeter also includes an adjustable foot cup 120 disposed below the base 110. The adjustable foot cup 120 includes a foot cup body 122 and an adjusting screw 121. The adjusting screw 121 is connected to the base 110, and the foot cup body 122 is screwed to the adjusting screw 121, so that the height of the base 110 is adjustable.

[0041] Specifically, the adjusting screw 121 is fixedly connected to the lower part of the column 112. The foot cup body 122 is a cup-shaped part with a larger lower end and a smaller upper end. The lower end of the foot cup body 122 is supported on a supportable surface such as the ground. The foot cup body 122 is screwed onto the adjusting screw 121. By operating the foot cup body 122 to rotate relative to the adjusting screw 121, the foot cup body 122 can move relative to the adjusting screw 121 in the axial direction, thereby adjusting the distance from the lower end of the foot cup body 122 to the base plate 111, realizing the height adjustment of the base 110, and thus achieving the purpose of adjusting the height of the mounting top surface 115, so that the installation height of the flow meter 200 is adapted to the height of the flow platform.

[0042] Furthermore, there are multiple adjustable feet 120, all of which are located below the base 110, to adjust the levelness of the mounting top surface 115 by adjusting the height of the adjustable feet 120. Since there are multiple adjustable feet 120, the height of different positions on the base 110 can be changed by adjusting the height of the multiple adjustable feet 120, thereby adjusting the mounting top surface 115 to a horizontal position. Specifically, in this embodiment, the adjustable feet 120 are arranged in a one-to-one correspondence with the columns 112. There are four columns 112, located at the four corners of the base plate 111 and the mounting plate 113, and correspondingly, there are four adjustable feet 120. It is understood that in other embodiments, the specific structure of the base 110 and the number of columns 112 and adjustable feet 120 can be set according to requirements.

[0043] In this embodiment, the mounting bracket 130 includes a frame 131 and a fixing plate 132 mounted on the frame 131. The frame 131 is fixedly connected to the mounting top surface 115, and the fixing plate 132 is fixedly connected to the frame 131. The fixing plate 132 is inclined relative to the mounting top surface 115, thus forming a mounting inclined surface 133. The inclination angle of the mounting inclined surface 133 relative to the mounting top surface 115 is the preset angle required for the flow meter 200. The fixing plate 132 is also provided with fasteners 134 for fixing the flow meter 200. The flow meter 200 is fixed to the fixing plate 132 by the fasteners 134, so that the angle of the flow meter 200 is at the required preset angle. When fixing the flow meter 200, the flow meter 200 should be fixed to the key parts for obtaining flow information, such as the rotor, and fixed to the fixing plate 132 at the preset angle. Specifically, the fixed connection between the frame 131 and the mounting plate 113 can be a non-removable method such as welding, or a detachable method such as bolt fastening.

[0044] Optionally, the tilt angle of the mounting ramp 133 is 29.2°. It is understood that in some other embodiments, the tilt angle of the mounting ramp 133 can also be set according to specific test requirements.

[0045] In this embodiment, the flow meter calibration support fixture 100 for flight testing also includes an oil inlet pipe assembly 140. One end of the oil inlet pipe assembly 140 is used to communicate with a flow meter (not shown in the figure), and the other end of the oil inlet pipe assembly 140 is used to communicate with a flow meter 200 to deliver calibration fluid from the flow meter to the flow meter 200. The flow meter is the device used to calibrate the flow meter 200.

[0046] Specifically, the oil inlet pipe assembly 140 has a first oil inlet end 141 and a first oil outlet end 142. The first oil inlet end 141 is used to communicate with the flow meter, and the first oil outlet end 142 is used to communicate with the flow meter 200. Optionally, both the first oil inlet end 141 and the first oil outlet end 142 are provided with flange structures, and the communication with the flow meter and the flow meter 200 is realized through the flange structures.

[0047] Furthermore, the oil inlet pipe assembly 140 includes a pipe support 146 and interconnected rigid oil inlet pipe 143 and flexible oil inlet pipe 144. The end of the rigid oil inlet pipe 143 away from the flexible oil inlet pipe 144 is connected to the flow meter, and the end of the flexible oil inlet pipe 144 away from the rigid oil inlet pipe 143 is connected to the flow meter 200. The pipe support 146 is used to support the rigid oil inlet pipe 143 and to adjust the height of the rigid oil inlet pipe 143 so that the flexible oil inlet pipe 144 is coaxially arranged with the flow meter 200.

[0048] Specifically, one end of the rigid oil inlet pipe 143 forms a first oil inlet end 141, and the other end of the rigid oil inlet pipe 143 is connected to the oil inlet hose 144. The other end of the oil inlet hose 144 forms a first oil outlet end 142. The pipeline support member 146 is a telescopic support rod structure, and its upper end is connected to the rigid oil inlet pipe 143. By raising and lowering the pipeline support member 146, the extension direction of the oil inlet hose 144 is adjusted to be consistent with the axis of the flow meter 200, that is, the oil inlet hose 144 and the flow meter 200 are coaxially set. At the same time, the pipeline support member 146 can also support the oil inlet pipeline to a suitable position to avoid damage to other engine pipelines.

[0049] Optionally, the pipeline support 146 includes a first support section 1461, a second support section 1463, and a third support section 1465. The first support section 1461 and the second support section 1463 are inserted together. The first support section 1461 is provided with a plurality of first pin holes 1462, and the second support section 1463 is provided with a plurality of second pin holes 1464. By pulling the second support section 1463, the first pin holes 1462 and / or the second pin holes 1464 at different height positions are aligned. The first support section 1461 and the second support section 1463 are fixed by passing a pin through the aligned first pin holes 1462 and second pin holes 1464, thereby achieving coarse height adjustment. The second support section 1463 is screwed to the third support section 1465, and the connection forms a threaded rod structure, which is used to achieve fine height adjustment. The above structure enables precise height adjustment of the pipeline support 146. Optionally, the adjustment range of the pipeline support 146 can be set to 0–400 mm. The upper end of the third support section 1465, i.e., the end of the third support section 1465 furthest from the second support section 1463, is connected to the oil inlet rigid pipe 143. Thus, the height of the oil inlet rigid pipe 143 can be precisely adjusted through coarse and fine adjustments of the height of the pipeline support 146, effectively ensuring the coaxiality of the oil inlet hose 144 and the flow meter 200.

[0050] It should be noted that the structure of the height-adjustable pipe support 146 is not limited here. It is understood that in some other embodiments, other structures of pipe support 146 may also be used. For example, the first support section 1461 and the second support section 1463 may be configured to be locked at different height positions by a clamp structure.

[0051] Optionally, the inlet pipe assembly 140 also includes a temperature transmitter 145, which is mounted on the inlet rigid pipe 143. The connection between the pipe support 146 and the inlet rigid pipe 143 is located at the end of the temperature transmitter 145 away from the inlet hose 144. The temperature transmitter 145 detects the temperature of the calibration fluid delivered to the flow meter 200 from the inlet pipe assembly 140. Specifically, the temperature transmitter 145 can be a temperature transmitter that can display the temperature, thus obtaining temperature information more directly.

[0052] Furthermore, to ensure the test temperature remains between -40℃ and +60℃, the oil inlet hose 144 is also wrapped with an insulation layer. Optionally, the insulation layer can be made of the same insulation material used in air conditioning pipes, such as foam insulation cotton.

[0053] In this embodiment, the flow meter calibration support fixture 100 for flight testing also includes an oil outlet pipe assembly 150. The oil outlet pipe assembly 150 includes an oil outlet hose 151, one end of which is connected to the flow meter, and the other end of which is connected to the flow meter 200 to guide the calibration fluid flowing through the flow meter 200 back to the flow meter. Specifically, the two ends of the oil outlet pipe assembly 150 are a second oil inlet 152 and a second oil outlet 153, respectively. The second oil inlet 152 is connected to the flow meter 200, and the second oil outlet 153 is connected to the flow meter.

[0054] Furthermore, the oil outlet pipe assembly 150 also includes an oil outlet rigid pipe 154, and the oil outlet hose 151 is connected to the oil outlet rigid pipe and communicates with the flow meter through the oil outlet rigid pipe 154. Specifically, the end of the oil outlet hose 151 connected to the flow meter 200 forms a second oil inlet end 152, and the end of the oil outlet rigid pipe 154 connected to the flow meter forms a second oil outlet end 153. Optionally, the oil outlet pipe assembly 150 also includes flanges disposed at the second oil inlet end 152 and the second oil outlet end 153, and the oil outlet hose 151 and the oil outlet rigid pipe 154 are respectively connected to the flanges through a compression fitting structure.

[0055] Embodiments of the present invention also provide a method for calibrating a fly-through test flowmeter, which can be implemented based on the fly-through test flowmeter calibration support fixture 100 provided above. Specifically, the fly-through test flowmeter calibration method includes:

[0056] S01: Install the flow meter 200 on the mounting ramp 133 of the mounting bracket 130 so that the flow meter 200 is at a preset angle.

[0057] The mounting bracket 130 is set on the mounting top surface 115 of the base 110. The mounting top surface 115 is adjusted to be horizontal according to the metal spirit level 116. The preset angle is the tilt angle of the mounting slope 133 when the mounting top surface 115 is horizontal.

[0058] Specifically, to ensure that the mounting top surface 115 is horizontal, before or during step S01, an adjustment step is included to make the mounting top surface 115 horizontal. Specifically, this adjustment process includes: adjusting the adjusting foot cup 120, and observing the metal level bubble 116 during the adjustment process to ensure that the metal level bubble 116 is within the specified area, thereby determining that the mounting top surface 115 is horizontal, and thus ensuring the installation angle of the flow meter 200.

[0059] Furthermore, after performing step S01, the oil inlet pipe assembly 140 can be adjusted to a suitable height by adjusting the pipe support 146 to ensure that the oil inlet hose 144 is coaxial with the flow meter 200.

[0060] S02: Calibrate the flow meter 200.

[0061] The inlet pipe assembly 140 and the outlet pipe assembly 150 are installed on the flow meter, thereby forming an oil path between the flow meter and the flow meter 200 through the inlet pipe assembly 140 and the outlet end assembly, thus realizing the calibration of the flow meter 200.

[0062] The flow meter calibration support fixture 100 and calibration method provided in the embodiments of the present invention calibrate the flow meter 200 by fixing it at an angle consistent with the actual installation angle during the flight test, thereby obtaining the flow calibration data at the actual installation angle. This helps to ensure the accuracy of flow monitoring during the flight test after calibration, provides support for the correction of fuel flow measurement data, and the support fixture is not limited by the site, enabling calibration service support at the test site.

[0063] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A calibration support fixture for a flow meter under test, used to mount the flow meter to be calibrated, characterized in that, The calibration support fixture for the flight test flowmeter includes: The base has a mounting top surface; A metal spirit level mounted on the mounting surface, the metal spirit level being used to detect the levelness of the mounting surface to ensure that the mounting surface is level; and A mounting bracket is installed on the mounting top surface. The mounting bracket has a mounting slope for mounting and fixing the flow meter, and so that the flow meter is at a preset angle; wherein, the preset angle is the inclination angle of the mounting slope.

2. The calibration support fixture for the test flowmeter according to claim 1, characterized in that, The calibration support fixture for the test flowmeter also includes an adjustable foot cup located below the base. The adjustable foot cup includes a foot cup body and an adjusting screw. The adjusting screw is connected to the base, and the foot cup body is screwed to the adjusting screw so that the height of the base is adjustable.

3. The calibration support fixture for the flight test flowmeter according to claim 2, characterized in that, The number of adjustable feet is multiple, and all of the adjustable feet are located below the base so as to adjust the levelness of the mounting top surface by adjusting the height of the adjustable feet.

4. The calibration support fixture for the test flowmeter according to claim 1, characterized in that, The calibration support fixture for the flight test flow meter also includes an oil inlet pipe assembly. One end of the oil inlet pipe assembly is used to connect with the flow station, and the other end of the oil inlet pipe assembly is used to connect with the flow meter to deliver the calibration fluid oil from the flow station to the flow meter.

5. The calibration support fixture for the test flowmeter according to claim 4, characterized in that, The oil inlet pipe assembly includes a pipe support and an interconnected rigid oil inlet pipe and a flexible oil inlet pipe. The end of the rigid oil inlet pipe away from the flexible oil inlet pipe is used to communicate with the flow meter, and the end of the flexible oil inlet pipe away from the rigid oil inlet pipe is used to communicate with the flow meter. The pipe support is used to support the rigid oil inlet pipe and to adjust the height of the rigid oil inlet pipe so that the flexible oil inlet pipe is coaxial with the flow meter.

6. The calibration support fixture for the test flowmeter according to claim 5, characterized in that, The oil inlet hose is wrapped with an insulation layer.

7. The calibration support fixture for the test flowmeter according to claim 5, characterized in that, The oil inlet pipe assembly also includes a temperature transmitter, which is mounted on the rigid oil inlet pipe, and the connection between the pipe support and the rigid oil inlet pipe is located on the side of the temperature transmitter away from the flexible oil inlet pipe.

8. The calibration support fixture for the test flowmeter according to claim 1, characterized in that, The calibration support fixture for the flight test flow meter also includes an oil outlet pipe assembly, which includes an oil outlet hose. One end of the oil outlet pipe assembly is used to communicate with the flow station, and the other end of the oil outlet pipe assembly is used to communicate with the flow meter to guide the calibration liquid oil flowing through the flow meter back to the flow station.

9. The calibration support fixture for the test flowmeter according to claim 1, characterized in that, The inclination angle of the mounting ramp is 29.2°.

10. A method for calibrating a flow meter for a flight test, characterized in that, The calibration method for the flow meter used in the flight test includes: The flow meter is installed on the inclined surface of the mounting bracket so that the flow meter is at a preset angle; wherein, the mounting bracket is set on the top surface of the base, the top surface of the mounting bracket is adjusted to be horizontal according to the metal spirit level, and the preset angle is the inclination angle of the mounting bracket when the top surface of the mounting bracket is horizontal; The flow meter is calibrated.

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