A large-scale ultra-gravity centrifuge cooling and rotating airflow measurement device and method

Abstract

The present invention discloses a large-scale ultra-gravity centrifuge cooling and rotating airflow measurement device, comprising a heat exchanger, a frame, a temperature measurement plate, a pressure measurement plate, an airspeed measurement plate, a heat transfer coefficient measurement plate, a central temperature sensor, and an absolute pressure sensor. In the present invention, by adopting an integrated design, the centrifuge is cooled while measuring airflow parameters; the main structure of the present application is a complete cylindrical shape, not penetrating too deeply into the flow field to avoid interference with the airflow; a comprehensive method for measuring, calculating, and correcting the convective heat transfer coefficient is adopted to obtain high-precision convective heat transfer coefficient measurement results; the measurement device and method provided by the present application solve the internal cooling problem during the centrifuge internal flow field test experiment and the interference problem of the flow field itself when measuring various internal airflow parameters, thereby achieving the effect of accurately measuring various internal airflow parameters while cooling the centrifuge internally.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifuge temperature control, and in particular to a device and method for measuring the cooling and rotating airflow of a large-scale ultra-gravity centrifuge. Background Art

[0002] When the arm of a large ultra-gravity centrifuge rotates at high speed, it drives the gas around the arm to rotate at high speed. The arm stirs the air and generates heat through friction. Therefore, appropriate temperature control measures must be adopted to cool the inside of the centrifuge.

[0003] A common temperature control measure for centrifuges is a sidewall heat exchanger. These cylindrical devices are located on the sidewalls of the centrifuge chamber. Their cooling capacity can be quantified using the wall's convective heat transfer coefficient and the airflow temperature. The convective heat transfer coefficient depends on multiple parameters, including the chamber's internal air pressure, airflow rotational speed, and velocity pulsation. Heat transfer is complex, and no established heat transfer model exists. Therefore, internal centrifuge flow field testing and verification studies using field data are necessary to clarify the airflow patterns and convective heat transfer coefficient within the centrifuge chamber.

[0004] Parameters required for centrifuge internal flow field testing include airflow temperature, pressure, velocity, and convective heat transfer coefficient. Each parameter is measured using corresponding temperature sensors, pressure sensors, pitot tubes, and other sensors. Existing flow field measurement devices often use brackets to secure the sensors within the centrifuge chamber, exposing them directly to the airflow and obtaining various flow parameters. However, this mounting method presents several issues. The brackets and sensors themselves are located within the flow field, interfering with the internal airflow and causing significant errors that can severely impact test results. Summary of the Invention

[0005] The purpose of the present invention is to provide a large-scale ultra-gravity centrifuge cooling and rotating airflow measurement device and method, so as to solve the internal cooling problem during the centrifuge internal flow field test experiment and the interference problem of the flow field itself when measuring various parameters of the internal airflow, so as to achieve the effect of accurately measuring various parameters of the internal airflow while cooling the centrifuge.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A large-scale ultra-gravity centrifuge cooling and rotating airflow measurement device includes a heat exchanger, a frame, a temperature measuring plate, a pressure measuring plate, an airspeed measuring plate, a heat transfer coefficient measuring plate, a central temperature sensor, and an absolute pressure sensor. The heat exchanger includes four arc-shaped heat exchange units, which form a cylindrical surface with four gaps and are fixed into an integral body by the frame. The temperature measuring plate, pressure measuring plate, airspeed measuring plate, and heat transfer coefficient measuring plate are respectively embedded in the four gaps and together with the four arc-shaped heat exchange units of the heat exchanger form a complete cylindrical surface. The central temperature sensor and absolute pressure sensor are located near the centrifuge shaft.

[0008] Preferably, the temperature measurement board includes several total temperature sensors.

[0009] Preferably, the pressure measuring plate includes a plurality of pressure inlet holes and a static pressure tube, the pressure inlet holes penetrate the pressure measuring plate, and the static pressure tube is located at the rear side of the pressure measuring plate.

[0010] Preferably, the airspeed measurement panel includes a plurality of airspeed tubes.

[0011] Preferably, the heat transfer coefficient measuring plate includes a plurality of heat transfer coefficient measuring devices, and the front faces of the heat transfer coefficient measuring devices are flush with the front face of the heat transfer coefficient measuring plate to avoid interference with the airflow.

[0012] Preferably, a method for measuring a large-scale ultra-gravity centrifuge cooling and rotating airflow measurement device comprises the following steps:

[0013] S1. Measure the temperature and absolute pressure at the center of the centrifuge chamber using a central temperature sensor and an absolute pressure sensor;

[0014] S2. Several total temperature sensors use the airflow stagnation effect to measure the stagnation temperature of the high-speed airflow near the wall, that is, the total temperature of the high-speed airflow;

[0015] S3. Compare the pressures at the pressure-inlet port and the static pressure pipe to measure the pressure difference across the pressure-measuring plate caused by the centrifuge's rotating airflow. Because the pressure-measuring plate and the heat exchanger together form a complete cylindrical surface and are positioned similarly, the measured pressure difference across the pressure-measuring plate is equivalent to the pressure difference across the heat exchanger.

[0016] S4. Comparing the pressure drawn from the absolute pressure sensor and the static pressure pipe, the pressure difference between the center of the rotating shaft and the edge of the chamber caused by the inertial centrifugal force caused by the rotating airflow of the centrifuge can be measured, i.e., the centrifugal pressure difference;

[0017] S5. By combining the absolute pressure sensor, the centrifugal pressure difference, and the pressure difference on both sides of the heat exchanger, the absolute pressure on the back and front of the heat exchanger can be obtained;

[0018] S6. Measure the airflow velocity through a pitot tube, derive the total pressure and static pressure of the airflow, measure the pressure difference, and calculate the dynamic pressure and velocity of the airflow;

[0019] S7. The heat transfer coefficient measuring device calculates the wall convection heat transfer coefficient using the measured wall heat flux density and the wall heat transfer temperature difference through the reverse heat flow method.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] 1. The present application adopts an integrated design to measure airflow parameters while cooling the centrifuge. The main structure of the present application is a complete cylindrical shape, which does not penetrate too deep into the flow field to avoid interference with the airflow. A complete convective heat transfer coefficient measurement, calculation, and correction method is adopted to obtain high-precision convective heat transfer coefficient measurement results. The measurement device and method provided by the present application solve the internal cooling problem during the centrifuge internal flow field test experiment and the interference problem of the flow field itself when measuring various internal airflow parameters, thereby achieving the effect of accurately measuring various internal airflow parameters while cooling the centrifuge. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the main structure of a large-scale ultra-gravity centrifuge cooling and rotating airflow measurement device provided in accordance with an embodiment of the present invention is shown;

[0023] Figure 2 A schematic structural diagram of a temperature measurement board according to an embodiment of the present invention is shown;

[0024] Figure 3 A schematic structural diagram of a pressure measurement plate according to an embodiment of the present invention is shown;

[0025] Figure 4 A schematic structural diagram of an airspeed measurement plate provided according to an embodiment of the present invention is shown;

[0026] Figure 5 A schematic structural diagram of a heat transfer coefficient measurement plate provided according to an embodiment of the present invention is shown.

[0027] Legend:

[0028] 1. Heat exchanger; 2. Frame; 3. Temperature measuring plate; 31. Total temperature sensor; 4. Pressure measuring plate; 41. Pressure inlet; 42. Static pressure tube; 5. Airspeed measuring plate; 51. Airspeed tube; 6. Heat transfer coefficient measuring plate; 61. Heat transfer coefficient measuring device; 7. Center temperature sensor; 8. Absolute pressure sensor. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0030] See also Figure 1-5 , the present invention provides a technical solution:

[0031] A large-scale ultra-gravity centrifuge cooling and rotating airflow measurement device includes a heat exchanger 1, a frame 2, a temperature measuring plate 3, a pressure measuring plate 4, an airspeed measuring plate 5, a heat transfer coefficient measuring plate 6, a central temperature sensor 7, and an absolute pressure sensor 8. The heat exchanger 1 includes four arc-shaped heat exchange units, which form a cylindrical surface with four gaps and are fixed into an integral body by the frame 2. The temperature measuring plate 3, the pressure measuring plate 4, the airspeed measuring plate 5, and the heat transfer coefficient measuring plate 6 are respectively embedded in the four gaps and together with the four arc-shaped heat exchange units of the heat exchanger 1 form a complete cylindrical surface. The central temperature sensor 7 and the absolute pressure sensor 8 are located near the centrifuge shaft and measure the temperature and absolute pressure at the center of the centrifuge chamber.

[0032] Specifically, such as Figure 2 As shown, the temperature measurement board 3 includes several total temperature sensors 31, which use the airflow stagnation effect to measure the stagnation temperature of the high-speed airflow near the wall, that is, the total temperature of the high-speed airflow, as shown in FIG. Figure 3 As shown, the pressure measuring plate 4 includes a plurality of pressure-introducing holes 41 and a static pressure tube 42. The pressure-introducing holes 41 penetrate the pressure measuring plate 4 and draw out the pressure of the airflow in front of it. The static pressure tube 42 is located at the rear side of the pressure measuring plate 4 and draws out the static pressure of the air behind it.

[0033] Specifically, such as Figure 4 As shown, the airspeed measurement panel 5 includes several airspeed tubes 51 for measuring the airspeed near the wall, such as Figure 5 As shown, the heat transfer coefficient measuring plate 6 includes a plurality of heat transfer coefficient measuring devices 61 , and the front of the heat transfer coefficient measuring device 61 is flush with the front of the heat transfer coefficient measuring plate 6 to avoid interference with the airflow.

[0034] A method for measuring a large-scale ultra-gravity centrifuge cooling and rotating airflow measurement device comprises the following steps:

[0035] S1, measuring the temperature and absolute pressure at the center of the centrifuge chamber through the central temperature sensor 7 and the absolute pressure sensor 8;

[0036] S2, a plurality of total temperature sensors 31 use the airflow stagnation effect to measure the stagnation temperature of the high-speed airflow near the wall, that is, the total temperature of the high-speed airflow;

[0037] S3. Compare and measure the pressures drawn from the pressure-introducing hole 41 and the static pressure pipe 42 to measure the pressure difference across the pressure-measuring plate 4 caused by the centrifuge's rotating airflow. Because the pressure-measuring plate 4 and the heat exchanger 1 together form a complete cylindrical surface and are positioned at the same position, the measured pressure difference across the pressure-measuring plate 4 is equivalent to the pressure difference across the heat exchanger 1.

[0038] S4. Comparing the pressures drawn from the absolute pressure sensor 8 and the static pressure pipe 42, the pressure difference between the center of the rotating shaft and the edge of the chamber caused by the inertial centrifugal force caused by the rotating airflow of the centrifuge can be measured, i.e., the centrifugal pressure difference;

[0039] S5. By combining the absolute pressure sensor 8, the centrifugal pressure difference, and the pressure difference on both sides of the heat exchanger 1, the absolute pressures on the back and front sides of the heat exchanger 1 can be obtained.

[0040] S6. Measure the airflow velocity through the pitot tube 51, derive the total pressure and static pressure of the airflow, measure the pressure difference, and calculate the dynamic pressure and velocity of the airflow;

[0041] S7. The heat transfer coefficient measuring device 61 calculates the wall convection heat transfer coefficient using the measured wall heat flux density and the wall heat transfer temperature difference through the reverse heat flow method.

[0042] The present application adopts an integrated design to measure airflow parameters while cooling the centrifuge. The main structure of the present application is a complete cylindrical shape, which does not penetrate too deep into the flow field to avoid interference with the airflow. A complete convective heat transfer coefficient measurement, calculation, and correction method is adopted to obtain high-precision convective heat transfer coefficient measurement results. The measurement device and method provided by the present application solve the internal cooling problem during the centrifuge internal flow field test experiment and the interference problem of the flow field itself when measuring various internal airflow parameters, thereby achieving the effect of accurately measuring various internal airflow parameters while cooling the centrifuge.

[0043] The above description of the embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A large-scale ultra-gravity centrifuge cooling and rotating airflow measurement device, characterized in that: The invention comprises a heat exchanger (1), a frame (2), a temperature measuring plate (3), a pressure measuring plate (4), an airspeed measuring plate (5), a heat transfer coefficient measuring plate (6), a central temperature sensor (7) and an absolute pressure sensor (8). The heat exchanger (1) comprises four arc-shaped heat exchange units, which form a cylindrical surface with four gaps and are fixed into a whole by the frame (2). The temperature measuring plate (3), the pressure measuring plate (4), the airspeed measuring plate (5) and the heat transfer coefficient measuring plate (6) are respectively embedded in the four gaps and together with the four arc-shaped heat exchange units of the heat exchanger (1) form a complete cylindrical surface. The central temperature sensor (7) and the absolute pressure sensor (8) are located near the rotating shaft of the centrifuge. The heat transfer coefficient measuring plate (6) comprises a plurality of heat transfer coefficient measuring devices (61). The front of the heat transfer coefficient measuring device (61) is flush with the front of the heat transfer coefficient measuring plate (6) to avoid interference with the airflow.

2. A large-scale ultra-gravity centrifuge cooling and rotating airflow measuring device according to claim 1, characterized in that: The temperature measurement plate (3) includes a plurality of total temperature sensors (31).

3. A large-scale ultra-gravity centrifuge cooling and rotating airflow measuring device according to claim 2, characterized in that: The pressure measuring plate (4) comprises a plurality of pressure-inducing holes (41) and a static pressure tube (42), wherein the pressure-inducing holes (41) penetrate the pressure measuring plate (4), and the static pressure tube (42) is located at the rear side of the pressure measuring plate (4).

4. A large-scale ultra-gravity centrifuge cooling and rotating airflow measuring device according to claim 3, characterized in that: The airspeed measurement plate (5) includes a plurality of airspeed tubes (51).

5. A measurement method based on the large-scale ultra-gravity centrifuge cooling and rotating airflow measurement device according to claim 4, characterized in that: The following steps are involved: S1, measuring the temperature and absolute pressure at the center of the centrifuge chamber through a central temperature sensor (7) and an absolute pressure sensor (8); S2, a plurality of total temperature sensors (31) use the airflow stagnation effect to measure the stagnation temperature of the high-speed airflow near the wall, that is, the total temperature of the high-speed airflow; S3. Comparing and measuring the pressures drawn out of the pressure-introducing hole (41) and the static pressure pipe (42), the pressure difference on both sides of the pressure measuring plate (4) caused by the rotating airflow of the centrifuge can be measured. Since the pressure measuring plate (4) and the heat exchanger (1) together form a complete cylindrical surface, the positions of the two are equivalent, and the pressure difference on both sides of the pressure measuring plate (4) measured is equivalent to the pressure difference on both sides of the heat exchanger (1); S4. Comparing and measuring the outlet pressures of the absolute pressure sensor (8) and the static pressure tube (42), the pressure difference between the center of the rotating shaft and the edge of the chamber caused by the inertial centrifugal force caused by the rotating airflow of the centrifuge can be measured, that is, the centrifugal pressure difference; S5. By combining the absolute pressure sensor (8), the centrifugal pressure difference and the pressure difference on both sides of the heat exchanger (1), the absolute pressure on the back and front sides of the heat exchanger (1) can be obtained; S6, measuring the airflow velocity through the pitot tube (51), respectively deriving the total pressure and static pressure of the airflow and measuring the pressure difference, and calculating the dynamic pressure and velocity of the airflow; S7. The heat transfer coefficient measuring device (61) calculates the wall convection heat transfer coefficient using the measured wall heat flux density and the wall heat transfer temperature difference through the reverse heat flow method.

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