Dynamic static pressure measuring device for high-temperature airflow

Abstract

The utility model belongs to the technical field of high-temperature pressure testing, and discloses a dynamic static pressure measuring device for high-temperature airflow, which is suitable for dynamic static pressure measurement of turbine inlets, turbine outlets and interstage wall surfaces. Comprising a cylindrical supporting rod, a pressure sensing hole, a dynamic pressure sensor, a pressure measuring channel, a water inlet channel, a water outlet channel, a partition plate, a cavity, a multifunctional positioning block, a fixing thread and a cable. The axis of the pressure sensing hole coincides with the axis of the supporting rod and communicates with the dynamic pressure sensor through the pressure measuring channel. The supporting rod is of a double-layer coaxial structure, the inner layer and the outer layer are divided by a vertically-arranged partition plate to form a water inlet channel and a water drainage channel, the sections of a water inlet and a water outlet are smoothly transited from a cashew nut shape to a round shape, and the flow area is constant. The lower end of the supporting rod is provided with a fixing thread and is matched with a multifunctional positioning block for positioning and fixing with the wall surface of the casing, thereby realizing dynamic static pressure measurement of the wall surface in a 2000K environment.

Description

Technical Field

[0001] This invention belongs to the field of high-temperature pressure testing technology, specifically relating to a dynamic static pressure measuring device for high-temperature airflow, suitable for dynamic static pressure measurement of turbine inlet, outlet and interstage walls. Background Technology

[0002] To further enhance the thermal efficiency and thrust output of turbine engines, the inlet temperature of the new generation of turbines is becoming increasingly higher, even exceeding 2200K. This places more stringent requirements on flow field measurement devices in terms of accuracy, response speed, and long-term reliability. In high-temperature, high-speed aerodynamic environments, accurate measurement of thermal flow parameters is a key requirement for assessing the health status and operational performance of engine components. To deeply analyze the pressure field distribution between turbine stages and at the turbine inlet and outlet, high-precision static pressure measurements are required, along with recording continuous pressure-time series.

[0003] However, in high-temperature, high-speed flow fields, traditional pressure probes suffer from significant shortcomings in measurement accuracy and long-term stability due to intense airflow disturbances, thermal expansion of the probe structure, and limited material temperature resistance. Furthermore, they struggle to achieve real-time monitoring of wall static pressure. To address the severe thermal load challenges, static pressure measurement devices must be equipped with efficient cooling systems to maintain the probe temperature below the material's temperature limit, ensuring continuous and reliable operation. Therefore, there is an urgent need to develop a high-temperature airflow dynamic static pressure measurement device with optimized structure, rapid response, high-temperature tolerance, and the ability to dynamically measure static pressure. This device would accurately capture the time-varying characteristics of static pressure in high-temperature aerodynamic environments, providing reliable data support for the design optimization, operational evaluation, and engineering applications of aero-engine turbine flow fields. Summary of the Invention

[0004] The technical problem to be solved by this invention is: to address the issue that the ambient temperature is too high during the measurement of pressure in the flow field between turbine stages and at the turbine inlet and outlet, which can easily damage the structure of the measuring device. This invention provides a high-temperature dynamic static pressure measuring device with high-temperature resistance. Compared with existing pressure probes, it can be continuously exposed to high-temperature fluid, responds quickly, and can measure the dynamic static pressure of the casing wall. This provides a practical technical means for measuring the dynamic static pressure of the turbine inlet, outlet, and interstage walls under high-temperature conditions.

[0005] The technical solution of this invention is:

[0006] A device for measuring dynamic static pressure of high-temperature airflow, characterized in that it includes a pressure sensing hole (1), a support rod (2), a dynamic pressure sensor (3), a pressure measuring channel (4), a water inlet channel (5), a drainage channel (6), a partition (7), a cavity (8), a multi-functional positioning block (9), a fixing thread (10), and a cable (11). The support rod (2) is a cylindrical structure. The head of the support rod (2) has a pressure sensing hole (1) that is connected to the dynamic pressure sensor (3) through the pressure measuring channel (4). The cable (11) of the dynamic pressure sensor (3) is connected to the outside through the tail of the support rod (2). The support rod (2) has a double-layer coaxial structure inside, and the inner and outer layers are separated by a vertically arranged partition (7). The support rod has an inlet channel (5) and a drain channel (6). The lower end of the support rod is provided with a fixing thread (10) for connecting and fixing to the casing wall. The support rod is provided with a pressure measuring channel (4), an inlet channel (5) and a drain channel (6) along the axial direction. The three are not connected to each other. The support rod (2) is provided with a multi-functional positioning block (9) at the rear end. One side is used for positioning, and the other side is a tightening device for fixing and connecting to the casing wall, ensuring accurate installation and stable positioning of the support rod. The support rod is made of stainless steel and the outer surface is sprayed with a high-temperature heat-insulating coating. The dynamic pressure sensor (3) has a measurement accuracy of 0.1% to 1% and a response frequency of 300Hz to 500kHz, thereby ensuring high-frequency response and high-precision performance in high-temperature airflow environment.

[0007] Furthermore, the pressure sensing hole (1) has a diameter of 0.8 mm to 2 mm, and the distance from its center to the bottom surface of the inner cavity of the support rod (2) is 0.5 mm to 4 mm. The center of the pressure sensing hole (1) and the center line of the support rod (2) are on the same axis, and the water inlet channel (5) and the drainage channel (6) are symmetrical along this axis.

[0008] Furthermore, the support rod (2) is a cylindrical structure with a diameter of 3 mm to 6 mm and a length of 10 mm to 30 mm;

[0009] Furthermore, the dynamic pressure sensor (3) has a measurement accuracy of 0.1%~1% and a response frequency of 300Hz~500kHz;

[0010] Furthermore, the water inlet channel (5) and the drainage channel (6) are integrated with the support rod (2) in a single processing structure. A chamfer is designed in the head corner area to effectively prevent the cooling water from boiling in a local area and prevent thermal stress concentration caused by high temperature from causing structural damage.

[0011] Furthermore, the cooling water channel inlet and outlet are designed to gradually transition from a special cashew-shaped cross-section to a circular cross-section structure. The flow area of ​​each cross-section is equal, avoiding flow separation and eddy current phenomena caused by abrupt changes in cross-section. The cashew-shaped cross-section can effectively guide the fluid to generate appropriate turbulence in the early stage of entering the pipe, increase the local heat exchange efficiency, and improve the cooling effect.

[0012] Cooling water is pumped into the support rod (2) through the water inlet channel (5) by a water pump. The cooling water flows along the length of the support rod in the channel and enters the drainage channel (6) for discharge. Throughout the process, the cooling water continuously circulates in the interlayer of the support rod (2) in a reflux manner. Under the effect of structural sealing, it will not enter the inner cavity of the support rod (2) and leak through the pressure measuring channel (4), thereby achieving effective cooling of the dynamic pressure sensor (3) and the internal space of the support rod (2). This design prevents the adverse effects of high temperature environment on the sensor measurement accuracy and structural stability, and improves the long-term stable operation capability and service life of the device under high temperature conditions.

[0013] The high-temperature airflow dynamic static pressure measurement device provided by this invention can obtain accurate calibration coefficients through wind tunnel calibration. In practical applications, the pressure sensing port at the device head is arranged perpendicular to the airflow direction, making it suitable for dynamic static pressure measurement of the turbine inlet, outlet, and interstage walls of aero-engines, and capable of acquiring dynamic static pressure data of the walls. This device can operate stably in airflow environments up to 2000K, and its probe frequency response exceeds 80kHz, meeting the requirements for dynamic static pressure measurement in complex high-temperature and high-speed flow fields.

[0014] The beneficial effects of this invention are:

[0015] Beneficial Effect 1: Compared with existing pressure measuring devices, this invention adopts a double-layer coaxial structure with a support rod and sets independent water inlet channels (5) and drainage channels (6) between the inner and outer layers. The circulating flow of cooling water in the interlayer achieves efficient cooling of the dynamic pressure sensor (3) and the internal space of the support rod (2). The cooling water can quickly conduct and remove the heat accumulated in the head shell, significantly improving the overall heat dissipation performance of the probe head. The water inlet channel has a large contact area with the cooling water and a short heat conduction path, allowing for rapid heat release through efficient convection heat transfer. This combines structural reinforcement with cooling heat transfer, greatly improving the heat dissipation efficiency and structural reliability of the measuring device. This ensures that even with an external ambient temperature as high as 2000K, the temperature near the sensor can be effectively controlled below 500K.

[0016] Second beneficial effect: The present invention introduces a chamfered structure design at the connecting corner between the cooling water inlet channel (5) and the outlet channel (6), which effectively alleviates the problem of thermal stress concentration caused by local structural changes, and can prevent the cooling water from local boiling in the high temperature area or thermal ablation caused by the cavity effect, further enhancing the safety of the measuring device in extreme thermal environments.

[0017] Benefit 3: The cooling water channel inlet and outlet are designed to gradually transition from a special cashew-shaped cross-section to a circular cross-section structure. The flow area of ​​each cross-section is equal, avoiding flow separation and eddy current phenomena caused by abrupt changes in cross-section. The cashew-shaped cross-section can effectively guide the fluid to generate appropriate turbulence in the early stage of entering the pipe, increase the local heat exchange efficiency, and improve the cooling effect.

[0018] Fourthly, the invention adheres closely to the casing wall and does not interfere with the flow field. After calibration in the wind tunnel, it can achieve dynamic static pressure measurement of the turbine inlet, outlet, and interstage walls of aero-engines, with a frequency response of up to 80kHz, meeting the requirements of high-speed dynamic measurement. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a device for measuring dynamic static pressure of high-temperature airflow in an embodiment of the present invention.

[0020] Figure 2 for Figure 1 The main view.

[0021] Figure 3 for Figure 1 The left view.

[0022] Figure 4 for Figure 1 A bottom view.

[0023] Figure 5 for Figure 2 Sectional view of section AA.

[0024] Figure 6 for Figure 2 BB section sectional view.

[0025] Figure 7 for Figure 4 The CC section sectional view.

[0026] Figure 8 for Figure 5 DD section sectional view.

[0027] Figure 9 This is a cross-sectional view showing the changing shape of the water inlet and outlet sections.

[0028] Figure 10 This is a schematic diagram illustrating the specific implementation.

[0029] Among them: 1-pressure sensing hole, 2-support rod, 3-pressure sensor, 4-pressure measuring channel, 5-water inlet channel, 6-drainage channel, 7-partition plate, 8-cavity, 9-multi-functional positioning block, 10-fixing thread, 11-cable. Detailed Implementation

[0030] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0031] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0032] like Figures 1-9 The image shows a device for measuring dynamic static pressure of high-temperature airflow according to the present invention. Figure 10 This is a schematic diagram of the device of the present invention used to measure the dynamic static pressure of the second stage stator wall of a multi-stage turbine. 1. It includes a pressure sensing hole (1), a support rod (2), a dynamic pressure sensor (3), a pressure measuring channel (4), a water inlet channel (5), a drainage channel (6), a partition (7), a cavity (8), a multi-functional positioning block (9), a fixing thread (10), and a cable (11). The support rod (2) is a cylindrical structure. The head of the support rod (2) has a pressure sensing hole (1) that is connected to the dynamic pressure sensor (3) through the pressure measuring channel (4). The cable (11) of the dynamic pressure sensor (3) is connected to the outside through the tail of the support rod (2). The support rod (2) is internally equipped with a pressure sensing hole (1). The double-layer coaxial structure is used. The inner and outer layers are separated by a vertically set partition (7) to form a water inlet channel (5) and a drainage channel (6). The lower end of the support rod is provided with a fixing thread (10) for connection and fixation with the casing wall. The support rod is provided with a pressure measuring channel (4), a water inlet channel (5) and a drainage channel (6) along the axial direction. The three are not connected to each other. The rear end of the support rod (2) is provided with a multi-functional positioning block (9) for fixed connection with the casing wall to ensure accurate installation and stable positioning of the support rod. The support rod is made of stainless steel and the outer surface is sprayed with a high-temperature heat-insulating coating.

[0033] The diameter of the pressure sensing hole (1) is 0.8 mm, and the distance from the center to the bottom surface of the inner cavity of the support rod (2) is 2 mm.

[0034] The support rod (2) is a cylindrical structure with a diameter of 5 mm and a length of 15 mm;

[0035] The dynamic pressure sensor (3) has a measurement accuracy of 1% and a response frequency of 500kHz;

[0036] The water inlet channel (5) and the drainage channel (6) are designed with a 90° chamfer near the corner of the device head to prevent the cooling water from generating cavitation at the corner, which can effectively prevent the cooling water from boiling in a local area and prevent thermal stress concentration caused by high temperature from causing structural damage.

[0037] Figure 9 The cooling water inlet and outlet are designed to gradually transition from a special cashew-shaped cross section to a circular cross section structure. The flow area of ​​each cross section is equal, avoiding flow separation and eddy current phenomena caused by abrupt changes in cross section. The cashew-shaped cross section can effectively guide the fluid to generate appropriate turbulence in the early stage of entering the pipe, increase the local heat exchange efficiency, and improve the cooling effect.

[0038] Cooling water is pumped into the support rod (2) through the water inlet channel (5) by a water pump. The cooling water flows along the length of the support rod in the channel and enters the drainage channel (6) for discharge. Throughout the process, the cooling water continuously circulates in the interlayer of the support rod (2) in a backflow manner. Under the effect of structural sealing, it will not enter the inner cavity of the support rod (2) and leak through the pressure measuring channel (4), thereby achieving effective cooling of the dynamic pressure sensor (3) and the internal space of the support rod (2), preventing the adverse effects of high temperature environment on the sensor measurement accuracy and structural stability, and improving the long-term stable operation capability and service life of the device under high temperature conditions.

[0039] The present invention describes a dynamic static pressure measuring device for high-temperature airflow, which adopts a double-layer coaxial structure with an inner and outer layer and an independent water inlet channel (5) and a drainage channel (6). The circulating flow of cooling water within the interlayer achieves efficient cooling of the dynamic pressure sensor (3) and the internal space of the support rod (2), effectively controlling the temperature near the sensor below 500K even when the external ambient temperature reaches 2000K. This significantly improves the stability and service life of the measuring device under high-temperature conditions. The present invention introduces a chamfered structure design at the connecting corner between the cooling water inlet channel (5) and the outlet channel (6), effectively alleviating the problem of thermal stress concentration caused by sudden changes in local structure, and preventing local boiling of the cooling water in the high-temperature zone or thermal ablation due to the cavity effect, further enhancing the safety of the measuring device under extreme thermal environments.

Claims

1. A device for measuring dynamic static pressure of high-temperature airflow, characterized in that: The system includes a pressure sensing hole (1), a support rod (2), a dynamic pressure sensor (3), a pressure measuring channel (4), a water inlet channel (5), a drainage channel (6), a partition (7), a cavity (8), a multi-functional positioning block (9), a fixing thread (10), and a cable (11). The support rod (2) is a cylindrical structure. The head of the support rod (2) has a pressure sensing hole (1) that connects to the dynamic pressure sensor (3) through the pressure measuring channel (4). The cable (11) of the dynamic pressure sensor (3) connects to the outside through the tail of the support rod (2). The support rod (2) has a double-layer coaxial structure inside. The inner and outer layers are separated by a vertically set partition (7) to form the water inlet channel (5) and the drainage channel (6). The support rod (6) has a fixed thread (10) at the lower end for connection and fixation with the casing wall. The support rod has a pressure measuring channel (4), a water inlet channel (5) and a drainage channel (6) arranged axially inside. The three are not connected to each other. The support rod (2) has a multi-functional positioning block (9) at the rear end. One side is used for positioning and the other side is a tightening device for fixed connection with the casing wall, ensuring accurate installation and stable positioning of the support rod. The support rod is made of stainless steel and the outer surface is sprayed with a high-temperature heat-insulating coating. The dynamic pressure sensor (3) has a measurement accuracy of 0.1% to 1% and a response frequency of 300Hz to 500kHz, thus ensuring high-frequency response and high-precision performance in high-temperature airflow environment. The pressure sensing hole (1) has a diameter of 0.8 mm to 2 mm, and the distance from its center to the bottom surface of the inner cavity of the support rod (2) is 0.5 mm to 4 mm. The center line of the pressure sensing hole (1) and the center line of the support rod (2) are on the same axis. The water inlet channel (5) and the drainage channel (6) are symmetrical along this axis. The support rod (2) is a cylindrical structure with a diameter of 3 mm to 6 mm and a length of 10 mm to 30 mm; The dynamic pressure sensor (3) has a measurement accuracy of 0.1%~1% and a response frequency of 300Hz~500kHz; The water inlet channel (5) and the drainage channel (6) are integrated with the support rod (2) in a single processing structure, and a chamfer is designed in the head corner area; Furthermore, the cooling water inlet and outlet are designed to smoothly transition from a cashew nut-shaped cross-section to a circular cross-section, with equal flow areas at each cross-section. Cooling water is injected into the support rod (2) by a water pump through the water inlet channel (5). The cooling water flows along the length of the support rod in the channel and enters the drainage channel (6) for discharge. Throughout the process, the cooling water continuously circulates in the interlayer of the support rod (2) in a reflux manner. Under the effect of structural sealing, it will not enter the inner cavity of the support rod (2) and leak through the pressure measuring channel (4), thereby achieving effective cooling of the dynamic pressure sensor (3) and the internal space of the support rod (2).

Images