A full-parameter probe for measuring high-subsonic three-dimensional steady-state flow fields

Abstract

The present invention belongs to the technical field of flow field testing, and discloses a full-parameter probe for measuring a high-subsonic three-dimensional steady-state flow field, including a probe head, a pressure sensing hole, a convection heat exchange hole, a temperature sensor, a heat-insulating seal, a pressure-leading pipe, a temperature sensor cable, a temperature sensor cable lead-out channel, a pressure-leading pipe lead-out channel, and a probe support rod. Three pressure sensing holes are opened on the windward surface of the cylinder of the probe head, and one pressure sensing hole is opened on the windward surface of the blunt cone. The temperature sensor is placed in the convection heat exchange hole on the leeward side of the probe head to protect the temperature sensor from the impact of the high-speed mainstream. Compared with the existing probe, the present invention can simultaneously measure the total temperature, static temperature, total pressure, static pressure, deflection angle, pitch angle, Mach number, density and three-dimensional velocity of the high-subsonic three-dimensional steady-state flow field, and is suitable for the three-dimensional steady-state flow field between the inlet, outlet and impeller stages of high-subsonic compressors, fans, compressors, etc., and can achieve high-precision, refined, and multi-parameter flow field measurement.

Description

Technical Field

[0001] The present invention belongs to the field of flow field testing technology, and specifically relates to a full-parameter probe for measuring high-subsonic three-dimensional steady-state flow fields. The probe is suitable for measuring the three-dimensional steady-state flow fields at the inlet, outlet and between impeller stages of high-subsonic compressors, fans, compressors, etc. Background Art

[0002] For the three-dimensional flow field between the inlet, outlet and impeller stages of high-subsonic compressors, fans, and compressors, the flow field is chaotic and exhibits a very strong three-dimensional nature due to the interactions of rotor rotation, blade tip clearance, staggered arrangement of moving and static blade rows, and mixing of mainstream flow, wake and secondary flow. Therefore, accurately measuring the complex three-dimensional flow field parameters between the inlet, outlet and impeller stages of high-subsonic compressors, fans, compressors, etc. has always been a challenge for researchers. Currently, there are generally two solutions for measuring complex three-dimensional flow fields.

[0003] One is to use a five-hole pressure probe alone, and with the help of a displacement mechanism installed on the casing, drive the five-hole pressure probe to the measured position for measurement. The five-hole pressure probe can only measure the total pressure, static pressure, deflection angle, pitch angle and Mach number of the incoming flow, but cannot measure the total temperature; a separate total temperature probe is also required, and with the help of a displacement mechanism installed on the casing, drive the total temperature probe to the measured position for a separate total temperature measurement. When using the five-hole pressure probe and the total temperature probe alone, on the one hand, the measurement time is long, the test cost is high, and the two incoming flow conditions may vary to a certain extent; on the other hand, the measurement point positions of different probes are affected by the positioning of the displacement mechanism, resulting in different measurement positions for the two measurements. Therefore, the flow field parameters measured by the two probes must not be the same streamline. If the measurement data of these probes are combined to calculate the speed, it will lead to huge errors.

[0004] The second approach is to use a combined temperature and pressure probe for measurement. Traditional combined temperature and pressure probes place both the temperature sensor and pressure sensing hole on the windward side of the probe, facing the incoming flow. This occupies a relatively large area on the probe surface, resulting in poor spatial resolution of the flow field measurement. Existing total temperature probes or combined temperature and pressure probes are mostly designed with the temperature sensor facing the main flow. The temperature probe head uses a stagnation hood structure to collect the incoming flow, with the temperature sensor placed inside the stagnation hood. Its disadvantages are: First, the incoming flow directly impacts the temperature sensor. For high subsonic flow fields, due to the high flow velocity, it will cause a huge impact on the temperature sensor, which is very easy to damage the temperature sensor. It is also easily affected by impurities such as dust and oil droplets in the incoming flow, resulting in very low measurement reliability; Second, the insensitive angle range of total temperature measurement is small. When the incoming flow to be measured has a large deflection angle, the airflow cannot be fully stagnant. At the same time, the heat exchange on the surface of the temperature sensor is insufficient, and the total temperature measurement error is large; Third, the strength of the temperature sensor is usually improved by increasing the size of the temperature sensor. Coupled with the size of the stagnation cover, this will result in a larger probe size and poor spatial resolution.

[0005] Due to the aforementioned measurement issues, existing probes are unable to accurately measure the complex three-dimensional flow fields at the inlet, outlet, and between impeller stages of high-subsonic compressors, fans, and compressors. Researchers hope to simultaneously obtain refined, high-precision flow fields for design verification and diagnosis, enabling design improvements. Therefore, there is an urgent need for a probe with high precision, high reliability, and full-parameter measurement capabilities. This probe can be used to measure the total temperature, static temperature, total pressure, static pressure, deflection angle, pitch angle, Mach number, density, and velocity of the complex three-dimensional flow fields at the inlet, outlet, and between impeller stages of high-subsonic compressors, fans, and compressors. Summary of the Invention

[0006] Aiming at the problems of low spatial resolution, insufficient flow field measurement, large measurement error, low measurement accuracy and easy damage of temperature sensors when existing probes measure high subsonic three-dimensional steady-state flow fields, a full-parameter probe is proposed, which can simultaneously measure the total temperature, static temperature, total pressure, static pressure, deflection angle, pitch angle, Mach number, density and velocity of high subsonic three-dimensional steady-state flow fields. The probe head of the present invention is composed of a cylinder and a blunt cone. Four pressure sensing holes are opened on the conical surface and the cylindrical surface to realize three-dimensional flow field parameter measurement. Compared with the existing high subsonic flow field measurement probe, the blunt cone can effectively reduce the impact on the measured flow field and the impact of shock waves on the measurement results; in addition, the present invention abandons the design concept of the traditional total temperature probe, but based on the applicant's many years of research, creatively proposes a layout and structural design of placing the temperature sensor in the leeward convection heat exchange hole of the probe head, and making the temperature sensor face the pressure sensing hole, which can ensure the simultaneous measurement of multiple parameters of the same streamline; it can also effectively reduce the impact of the airflow on the temperature sensor and the influence of dust and oil droplets contained in the airflow on the temperature sensor, greatly improving the life of the temperature sensor; strengthening the convective heat exchange between the airflow and the temperature sensor, and the temperature recovery coefficient is high and stable within a larger deflection angle range; under a limited probe head size, full flow field parameter measurement is achieved. Most importantly, compared with existing high-subsonic flow field measurement probes, the present invention can simultaneously measure the total temperature, static temperature, total pressure, static pressure, deflection angle, pitch angle, Mach number, density and speed of the high-subsonic three-dimensional steady-state flow field with high precision and high reliability, and can realize refined measurement of the flow field.

[0007] The technical solution of the present invention is:

[0008] 1. A full-parameter probe for measuring high-subsonic three-dimensional steady-state flow fields, comprising a probe head (1), a probe support rod (2), a cylinder (3), a cone (4), a pressure-sensing left hole (5), a pressure-sensing middle hole (6), a pressure-sensing right hole (7), a pressure-sensing upper hole (8), a heat-insulating seal (9), a temperature sensor (10), a convection heat exchange left hole (11), a convection heat exchange middle hole (12), a convection heat exchange right hole (13), a temperature sensor cable lead-out channel (14), a pressure lead-out channel (15), a temperature sensor cable (16) and a pressure lead-out channel (17), wherein the probe head (1) comprises a cylinder (3) and a blunt cone (4) with a common bottom surface, and four mutually independent openings are provided on the windward side of the probe head (1). The cylinder (3) has three pressure sensing holes, namely, a left pressure sensing hole (5), a middle pressure sensing hole (6), and a right pressure sensing hole (7), on the windward side of the cylinder (3); a top pressure sensing hole (8) is opened on the windward side of the cone (4); and three convection heat exchange holes are opened on the leeward side of the cylinder (3), namely, a left convection heat exchange hole (11), a middle convection heat exchange hole (12), and a right convection heat exchange hole (13). A temperature sensor cable lead-out channel (14) is opened in the middle convection heat exchange hole (12) along the axis of the cylinder (3); the head of the temperature sensor (10) is placed in the middle convection heat exchange hole (12); and a heat insulating seal (9) is located in the temperature sensor cable lead-out channel (14) to fix the temperature sensor (10).

[0009] 2. Furthermore, the diameter of the cylinder (3) is 2 mm to 6 mm, the length is 20 mm to 60 mm, the blunt cone angle of the cylinder (3) and the bottom surface is 90° to 120°, and the cone tip is a quarter spherical structure after being blunted. Four mutually unconnected pressure pipe lead-out channels (15) and a temperature sensor cable lead-out channel (14) are opened inside the cylinder (3) along the axial direction of the cylinder (3). The four pressure pipe lead-out channels (15) are respectively connected to the pressure sensing left hole (5), the pressure sensing middle hole (6 ), the pressure sensing right hole (7), and the pressure sensing upper hole (8) are connected, the pressure leading pipe (17) is connected to the pressure sensing left hole (5), the pressure sensing middle hole (6), the pressure sensing right hole (7), and the pressure sensing upper hole (8) respectively, and is led out of the tail of the probe support rod (2) through the pressure leading pipe leading channel (15), and the temperature sensor cable (16) is led out of the tail of the probe support rod (2) through the temperature sensor cable leading channel (14), and the axis of the cylinder (3) of the probe head (1) coincides with the axis of the probe support rod (2).

[0010] 3. Furthermore, the pressure sensing left hole (5), the pressure sensing middle hole (6), the pressure sensing right hole (7), and the pressure sensing upper hole (8) are all circular, with the same diameter of 0.2 mm to 1.2 mm. The center line of the pressure sensing middle hole (6) and the center line of the pressure sensing upper hole (8) are on the same plane as the axis of the cylinder (3) of the probe head (1). The pressure sensing left hole (5) and the pressure sensing right hole (7) are symmetrically distributed along the plane. The center line of the pressure sensing left hole (5) and the pressure sensing hole (8) are symmetrically distributed along the plane. The center line of the right hole (7) is cocircumferential and intersects with the axis of the cylinder (3), and the circumferential surface is perpendicular to the axis of the cylinder (3). The circumferential angle between the center of the pressure-sensing left hole (5) and the center of the pressure-sensing right hole (7) on the surface of the cylinder (3) is 60° to 120°. The distance between the center of the pressure-sensing middle hole (6) and the arc of the bottom surface of the blunt cone (4) is 0.6 mm to 1.2 mm. The distance between the center of the pressure-sensing upper hole (8) and the arc of the bottom surface of the blunt cone (4) is 0.4 mm to 1 mm.

[0011] 4. Furthermore, the center line of the convection heat exchange hole (12) coincides with the center line of the pressure sensing hole (6), the left convection heat exchange hole (11) and the right convection heat exchange hole (13) are symmetrically distributed along the center line of the convection heat exchange hole (12), the center line of the left convection heat exchange hole (11), the center line of the convection heat exchange hole (12), and the center line of the right convection heat exchange hole (13) are located on the same circumferential surface and intersect at one point, the circumferential surface is perpendicular to the axis of the cylinder (3), the intersection point is close to the leeward side of the cylinder (3), and the distance from the axis of the cylinder (3) is The diameter of the left convection heat exchange hole (11) is 0.3 mm to 1 mm, the middle convection heat exchange hole (12) and the right convection heat exchange hole (13) are all circular, the diameter of the middle convection heat exchange hole (12) is 1 mm to 2 mm, the diameter of the left convection heat exchange hole (11) and the right convection heat exchange hole (13) is 0.3 mm to 0.8 mm, the distance between the center of the middle convection heat exchange hole (12) and the bottom arc of the blunt cone (4) is 0.6 mm to 1.2 mm, and the center line angle of the left convection heat exchange hole (11) and the right convection heat exchange hole (13) is 160°.

[0012] 5. Furthermore, the temperature sensor cable lead-out channel (14) is located in the convection heat exchange hole (12), its axis is parallel to the axis of the cylinder (3), and the distance from the axis of the cylinder (3) is 0.6 mm to 2 mm. The head of the temperature sensor (10) is located on the center line of the convection heat exchange hole (12) and is fixed by the thermal insulation seal (9).

[0013] 6. After the probe of the present invention is calibrated in a calibration wind tunnel, a probe calibration curve is obtained. In actual measurement, based on the data measured by the pressure sensing left hole (5), the pressure sensing middle hole (6), the pressure sensing right hole (7), the pressure sensing upper hole (8) and the temperature sensor (10), and then according to the calibration coefficient curve and formula obtained by the calibration wind tunnel, through data processing, all parameters such as the total temperature, static temperature, total pressure, static pressure, deflection angle, pitch angle, Mach number, density and speed of the high subsonic three-dimensional steady-state flow field can be obtained at the same time. A structural design of placing the temperature sensor (10) on the leeward side of the probe head (1) is creatively proposed, which improves the service life of the temperature sensor (10) and the airflow insensitive angle range, and improves the spatial resolution. Under the limited size of the probe head (1), high-precision, refined and full-parameter measurement of the high subsonic three-dimensional steady-state flow field is achieved.

[0014] The beneficial effects of the present invention are:

[0015] Beneficial effect 1: The present invention can simultaneously measure the total temperature, static temperature, total pressure, static pressure, deflection angle, pitch angle, Mach number, density and speed in a high-subsonic three-dimensional steady-state flow field, solving the problems of long measurement time, high test cost, poor consistency of measurement conditions and large measurement error caused by the traditional measurement scheme using a five-hole pressure probe and a total temperature probe respectively.

[0016] Beneficial effect 2: The existing temperature probe or temperature-pressure combination probe faces the temperature sensor directly to the mainstream, and relies on the incoming flow to stagnate on the temperature sensor to measure the temperature. However, when the mainstream is high subsonic, the temperature sensor will be subjected to a great impact force. If the mainstream is also mixed with impurities such as dust and oil droplets, the temperature sensor is easily damaged. Based on the applicant's many years of research, the present invention creatively places the temperature sensor in the convection heat exchange hole on the leeward side, avoiding the high-speed incoming flow from directly impacting the temperature sensor, so that a smaller and thinner temperature sensor can be selected to improve the response time. In addition, a left convection heat exchange hole and a right convection heat exchange hole are opened on both sides of the probe head, so the airflow will flow and exchange heat between the three convection heat exchange holes, which can enhance the convection heat exchange in the temperature sensor area to achieve accurate measurement of the total temperature.

[0017] Beneficial Effect 3: Existing temperature and pressure probes place both the temperature sensor and the pressure sensing hole on the windward side of the probe, which requires a larger layout space and results in low spatial resolution. This probe places the temperature sensor on the leeward side of the probe head and the pressure sensing hole on the windward side of the probe head, with the temperature sensor facing the pressure sensing hole. This ensures simultaneous measurement of multiple parameters along the same streamline. By using a displacement mechanism to drive the probe along its movement, multi-plane flow field parameter measurements can be achieved, ensuring sufficiently high spatial resolution. Compared to existing temperature and pressure probes, this probe can achieve refined, high-precision flow field measurements.

[0018] Beneficial Effect 4: Conventional temperature probes or combined temperature and pressure probes face the temperature sensor directly toward the incoming flow, resulting in a very small stagnation zone and a narrow temperature measurement insensitivity angle. The present invention's probe head forms a larger low-speed recirculation zone and a stagnation high-temperature zone on the leeward side. The larger high-temperature zone means a wider temperature measurement insensitivity angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a full-parameter probe for measuring high-subsonic three-dimensional steady-state flow field in the first embodiment of the present invention.

[0020] Figure 2 yes Figure 1 rear view.

[0021] Figure 3 yes Figure 1 A partial sectional view of the left side view.

[0022] Figure 4 yes Figure 3 B-direction view.

[0023] Figure 5 yes Figure 3 C-direction view.

[0024] Figure 6 yes Figure 3 D-direction view.

[0025] Among them: 1—probe head, 2—probe support rod, 3—cylinder, 4—blunt cone, 5—pressure sensing left hole, 6—pressure sensing middle hole, 7—pressure sensing right hole, 8—pressure sensing upper hole, 9—thermal insulation seal, 10—temperature sensor, 11—convection heat exchange left hole, 12—convection heat exchange middle hole, 13—convection heat exchange right hole, 14—temperature sensor cable lead-out channel, 15—pressure pipe lead-out channel, 16—temperature sensor cable, 17—pressure pipe.

[0026] Figure 7 This is a schematic diagram of the probe of the present invention being used for the inlet of a high subsonic compressor, fan, compressor, etc.

[0027] Among them: 1 is the probe of the present invention, 2 is the first-stage stator, 3 is the first-stage rotor, and 4 is the second-stage stator.

[0028] Figure 8 This is a schematic diagram of the structure of a full-parameter probe for measuring high-subsonic three-dimensional steady-state flow field in the second embodiment of the present invention.

[0029] Figure 9 yes Figure 8 rear view.

[0030] Figure 10 yes Figure 8A partial sectional view of the left side view.

[0031] Figure 11 yes Figure 10 B-direction view.

[0032] Figure 12 yes Figure 10 C-direction view.

[0033] Figure 13 yes Figure 10 D-direction view.

[0034] Among them: 1—probe head, 2—probe support rod, 3—cylinder, 4—blunt cone, 5—pressure sensing left hole, 6—pressure sensing middle hole, 7—pressure sensing right hole, 8—pressure sensing upper hole, 9—thermal insulation seal, 10—temperature sensor, 11—convection heat exchange left hole, 12—convection heat exchange middle hole, 13—convection heat exchange right hole, 14—temperature sensor cable lead-out channel, 15—pressure pipe lead-out channel, 16—temperature sensor cable, 17—pressure pipe.

[0035] Figure 14 It is a schematic diagram of the interstage of the high subsonic compressor, fan, and compressor outlet impeller of the probe of the present invention.

[0036] Among them: 1 is the first-stage rotor, 2 is the first-stage stator, 3 is the probe of the present invention, and 4 is the second-stage stator. DETAILED DESCRIPTION

[0037] Implementation Case 1:

[0038] For the inlet of a high subsonic compressor, the incoming flow velocity is large and the three-dimensionality of the flow field is relatively weak. Therefore, the probe head (1) can be selected to have a larger diameter to ensure strength and rigidity; the temperature sensor can be selected to have an armored thermocouple with greater strength; the pressure sensing holes (5, 6, 7, 8) can be selected to have a larger diameter, and a larger angle can be selected between the pressure sensing left hole (5) and the pressure sensing right hole (7). Therefore, the following implementation method can be adopted:

[0039] Figures 1 to 6 This is a schematic diagram of the structure of a full-parameter probe for measuring high subsonic three-dimensional steady-state flow fields according to the present invention. Figure 7The present invention is a schematic diagram of a probe used for a high subsonic compressor inlet. The present invention comprises a probe head (1), a probe support rod (2), a cylinder (3), a blunt cone (4), a pressure sensing left hole (5), a pressure sensing middle hole (6), a pressure sensing right hole (7), a pressure sensing upper hole (8), a heat insulating seal (9), a temperature sensor (10), a convection heat exchange left hole (11), a convection heat exchange middle hole (12), a convection heat exchange right hole (13), a temperature sensor cable lead-out channel (14), a pressure lead-out channel (15), a temperature sensor cable (16) and a pressure lead-out tube (17), and is characterized in that: the probe head (1) comprises a cylinder (3) and a cone (4) with a common bottom surface, and four pressure sensing holes that are not connected to each other are opened on the windward side of the probe head (1). Three pressure sensing holes are opened on the windward side of the cylinder (3), namely, a pressure sensing left hole (5), a pressure sensing middle hole (6), and a pressure sensing right hole (7); one pressure sensing upper hole (8) is opened on the windward side of the cone (4); three convection heat exchange holes are opened on the leeward side of the cylinder (3), namely, a convection heat exchange left hole (11), a convection heat exchange middle hole (12), and a convection heat exchange right hole (13); a temperature sensor cable lead-out channel (14) is opened in the convection heat exchange middle hole (12) along the axis direction of the cylinder (3); the head of the temperature sensor (10) is placed in the convection heat exchange middle hole (12); and a heat insulating seal (9) is located in the temperature sensor cable lead-out channel (14) to fix the temperature sensor (10).

[0040] The diameter of the cylinder (3) is 6 mm and the length is 60 mm. The blunt cone angle of the cylinder (3) is 120°. The cone tip is a quarter spherical structure after being blunted. Four mutually unconnected pressure pipe outlet channels (15) and a temperature sensor cable outlet channel (14) are opened inside the cylinder (3) along the axial direction of the cylinder (3). The four pressure pipe outlet channels (15) are respectively connected to the pressure sensing left hole (5), the pressure sensing middle hole (6), and the pressure sensing right hole ( 7), the pressure sensing upper hole (8), the pressure leading pipe (17) is respectively connected to the pressure sensing left hole (5), the pressure sensing middle hole (6), the pressure sensing right hole (7), and the pressure sensing upper hole (8) and leads out of the tail of the probe support rod (2) through the pressure leading pipe leading channel (15), and the temperature sensor cable (16) leads out of the tail of the probe support rod (2) through the temperature sensor cable leading channel (14), and the axis of the cylinder (3) of the probe head (1) coincides with the axis of the probe support rod (2).

[0041] The pressure sensing left hole (5), the pressure sensing middle hole (6), the pressure sensing right hole (7), and the pressure sensing upper hole (8) are all circular, with the same diameter of 1.2 mm. The center line of the pressure sensing middle hole (6) and the center line of the pressure sensing upper hole (8) are on the same plane as the axis of the cylinder (3) of the probe head (1). The pressure sensing left hole (5) and the pressure sensing right hole (7) are symmetrically distributed along the plane. The center line of the pressure sensing left hole (5) and the center line of the pressure sensing right hole (7) share a circumferential surface and intersect with the axis of the cylinder (3). The circumferential surface is perpendicular to the axis of the cylinder (3). The circumferential angle between the center of the pressure sensing left hole (5) and the center of the pressure sensing right hole (7) on the surface of the cylinder (3) is 120°. The distance between the center of the pressure sensing middle hole (6) and the arc of the bottom surface of the blunt cone (4) is 1.2 mm, and the distance between the center of the pressure sensing upper hole (8) and the arc of the bottom surface of the blunt cone (4) is 1 mm.

[0042] The center line of the convection heat exchange hole (12) coincides with the center line of the pressure sensing hole (6), the left convection heat exchange hole (11) and the right convection heat exchange hole (13) are symmetrically distributed along the center line of the convection heat exchange hole (12), the center line of the left convection heat exchange hole (11), the center line of the convection heat exchange hole (12), and the center line of the right convection heat exchange hole (13) are located on the same circumferential surface and intersect at a point, the circumferential surface is perpendicular to the axis of the cylinder (3), the intersection point is close to the leeward side of the cylinder (3), and the cylinder ( 3) The distance between the axes is 1 mm, the left convection heat exchange hole (11), the middle convection heat exchange hole (12), and the right convection heat exchange hole (13) are all circular, the diameter of the middle convection heat exchange hole (12) is 2 mm, the diameters of the left convection heat exchange hole (11) and the right convection heat exchange hole (13) are 0.8 mm, the distance between the center of the middle convection heat exchange hole (12) and the bottom arc of the blunt cone (4) is 1.2 mm, and the center line angle of the left convection heat exchange hole (11) and the right convection heat exchange hole (13) is 160°.

[0043] The temperature sensor cable lead-out channel (14) is located in the convection heat exchange hole, and its axis is parallel to the axis of the cylinder (3) and is 2 mm away from the axis of the cylinder (3). The head of the temperature sensor (10) is located on the center line of the convection heat exchange hole (12) and is fixed by the thermal insulation seal (9).

[0044] Before use, the present invention needs to be calibrated in a standard wind tunnel. The probe is placed in a uniform incoming flow. When the incoming flow velocity and angle are known, the total pressure coefficient, static pressure coefficient, deflection angle coefficient, pitch angle coefficient and temperature coefficient at different Mach numbers are calibrated.

[0045] The specific steps include:

[0046] Step A: In a standard wind tunnel with known incoming flow Mach number and velocity, allow the incoming flow to flow over a temperature and pressure probe to generate a surrounding flow.

[0047] Step B: Measure the pressure of the four pressure sensing holes on the windward surface of the probe;

[0048] Step C: measuring the temperature of the temperature sensor on the leeward side of the probe;

[0049] Step D: Define the pressure measured by the left pressure sensing hole (5) as P1, the pressure measured by the middle pressure sensing hole (6) as P2, the pressure measured by the right pressure sensing hole (7) as P3, the pressure measured by the upper pressure sensing hole (8) as P4, and the temperature measured by the temperature sensor (10) as T s , the total pressure of the incoming flow is P t , the static pressure of the incoming flow is P s , total temperature of incoming flow T t , from which we can obtain the total pressure coefficient, static pressure coefficient, deflection angle coefficient, pitch angle coefficient, and total temperature recovery coefficient at different incoming flow Mach numbers. The definitions of each coefficient are as follows:

[0050] Total pressure coefficient:

[0051] Static pressure coefficient:

[0052] Deflection angle coefficient:

[0053] Pitch angle coefficient:

[0054] Temperature recovery coefficient:

[0055] In this way, the calibration curves of the total pressure coefficient, static pressure coefficient, deflection angle coefficient, pitch angle coefficient and total temperature recovery coefficient at different Mach numbers, different deflection angles and different pitch angles can be obtained.

[0056] The measurement process of the present invention comprises the following steps:

[0057] Step A: placing the probe head in the abortion to be tested, and allowing the fluid to be tested to flow through the probe head;

[0058] Step B: Measure the pressure of the three pressure sensing holes on the windward side;

[0059] Step C: measuring the temperature of the leeward temperature sensor;

[0060] Step D: Based on the data from the four pressure sensing holes and the temperature data measured by the temperature sensor, calculate the deflection angle coefficient and pitch angle coefficient. Then, combined with the calibrated coefficient curve, interpolate and calculate the deflection angle, pitch angle, total pressure, static pressure, and Mach number. The incoming flow velocity can be solved using the following formula:

[0061]

[0062]

[0063]

[0064] c 2 =γRT s

[0065] P=ρRT

[0066] Among them, γ is the adiabatic index of the flow field, Ma is the Mach number of the flow field, v is the flow field velocity, c is the local sound speed of the flow field, ρ is the incoming flow density, and R is the gas constant.

[0067] Implementation Case 2:

[0068] For high subsonic compressor impeller interstage, the flow field velocity is relatively small, but the measurement space is narrow and the flow field three-dimensionality is relatively strong. Therefore, the probe head (1) can be selected with a smaller diameter to ensure spatial resolution and reduce interference with the measured flow field; the temperature sensor can be selected with a bare wire thermocouple or a temperature optical fiber sensor with a higher response; the pressure sensing holes (5, 6, 7, 8) can be selected with a smaller diameter, and the angle between the pressure sensing left hole (5) and the pressure sensing right hole (7) can be selected with a smaller angle. Therefore, the following implementation method can be adopted:

[0069] Figures 8 to 13 This is a schematic diagram of the structure of a full-parameter probe for measuring high subsonic three-dimensional steady-state flow fields according to the present invention. Figure 14The present invention is a schematic diagram of a probe used for a high subsonic compressor impeller interstage. The present invention comprises a probe head (1), a probe support rod (2), a cylinder (3), a blunt cone (4), a pressure sensing left hole (5), a pressure sensing middle hole (6), a pressure sensing right hole (7), a pressure sensing upper hole (8), a heat insulating seal (9), a temperature sensor (10), a convection heat exchange left hole (11), a convection heat exchange middle hole (12), a convection heat exchange right hole (13), a temperature sensor cable lead-out channel (14), a pressure lead-out channel (15), a temperature sensor cable (16) and a pressure lead-out tube (17), and is characterized in that: the probe head (1) comprises a cylinder (3) and a cone (4) with a common bottom surface, and four pressure sensing holes that are not connected to each other are opened on the windward side of the probe head (1). The cylinder (3) has three pressure sensing holes on its windward side, namely, a left pressure sensing hole (5), a middle pressure sensing hole (6), and a right pressure sensing hole (7). The cone (4) has one upper pressure sensing hole (8) on its windward side. The cylinder (3) has three convection heat exchange holes on its leeward side, namely, a left convection heat exchange hole (11), a middle convection heat exchange hole (12), and a right convection heat exchange hole (13). A temperature sensor cable lead-out channel (14) is provided in the middle convection heat exchange hole (12) along the axis of the cylinder (3). The temperature sensor (10) is placed in the middle convection heat exchange hole (12). A heat insulating seal (9) is located at the outlet of the temperature sensor cable lead-out channel (14) to fix the temperature sensor (10).

[0070] The diameter of the cylinder (3) is 2 mm and the length is 20 mm. The blunt cone angle of the cylinder (3) is 90°. The cone tip is blunted to form a quarter spherical structure. Four mutually unconnected pressure pipe outlet channels (15) and a temperature sensor cable outlet channel (14) are opened inside the cylinder (3) along the axial direction of the cylinder (3). The four pressure pipe outlet channels (15) are connected to the pressure sensing left hole (5), the pressure sensing middle hole (6), and the pressure sensing right hole (7). ), the pressure sensing upper hole (8), the pressure leading pipe (17) is respectively connected to the pressure sensing left hole (5), the pressure sensing middle hole (6), the pressure sensing right hole (7), and the pressure sensing upper hole (8) and leads out of the tail of the probe support rod (2) through the pressure leading pipe leading channel (15), the temperature sensor cable (16) leads out of the tail of the probe support rod (2) through the temperature sensor cable leading channel (14), and the axis of the cylinder (3) of the probe head (1) coincides with the axis of the probe support rod (2).

[0071] The pressure sensing left hole (5), the pressure sensing middle hole (6), the pressure sensing right hole (7), and the pressure sensing upper hole (8) are all circular, with the same diameter of 0.2 mm. The center line of the pressure sensing middle hole (6) and the center line of the pressure sensing upper hole (8) are on the same plane as the axis of the cylinder (3) of the probe head (1). The pressure sensing left hole (5) and the pressure sensing right hole (7) are symmetrically distributed along the plane. The center line of the pressure sensing left hole (5) and the center line of the pressure sensing right hole (7) share a circumferential surface and intersect with the axis of the cylinder (3). The circumferential surface is perpendicular to the axis of the cylinder (3). The circumferential angle between the center of the pressure sensing left hole (5) and the center of the pressure sensing right hole (7) on the surface of the cylinder (3) is 60°. The distance between the center of the pressure sensing middle hole (6) and the arc of the bottom surface of the blunt cone (4) is 0.6 mm, and the distance between the center of the pressure sensing upper hole (8) and the arc of the bottom surface of the blunt cone (4) is 0.4 mm.

[0072] The center line of the convection heat exchange hole (12) coincides with the center line of the pressure sensing hole (6), the left convection heat exchange hole (11) and the right convection heat exchange hole (13) are symmetrically distributed along the center line of the convection heat exchange hole (12), the center line of the left convection heat exchange hole (11), the center line of the convection heat exchange hole (12), and the center line of the right convection heat exchange hole (13) are located on the same circumferential surface and intersect at a point, the circumferential surface is perpendicular to the axis of the cylinder (3), the intersection point is close to the leeward side of the cylinder (3), and the cylinder ( 3) The distance between the axes is 1 mm; the left convection heat exchange hole (11), the middle convection heat exchange hole (12), and the right convection heat exchange hole (13) are all circular, the diameter of the middle convection heat exchange hole (12) is 1 mm, and the diameters of the left convection heat exchange hole (11) and the right convection heat exchange hole (13) are 0.3 mm; the distance between the center of the middle convection heat exchange hole (12) and the bottom arc of the blunt cone (4) is 0.6 mm, and the center line angle of the left convection heat exchange hole (12) and the right convection heat exchange hole (13) is 160°.

[0073] The temperature sensor cable lead-out channel (14) is located in the convection heat exchange hole, and its axis is parallel to the axis of the cylinder (3) and the distance from the axis of the cylinder (3) is 0.6 mm. The temperature sensor (10) is located on the center line of the convection heat exchange hole (12) and is fixed by the thermal insulation seal (9).

[0074] After wind tunnel calibration, the present invention can realize the simultaneous measurement of all parameters such as total temperature, static temperature, total pressure, static pressure, deflection angle, pitch angle, Mach number, density and speed of the three-dimensional steady-state flow field between the impeller stages of a high subsonic compressor.

Claims

1. A method for using a full-parameter probe for measuring high-subsonic three-dimensional steady-state flow field to realize the measurement of the three-dimensional steady-state flow field between the inlet and outlet and the impeller stage of a high-subsonic compressor, fan compressor, etc. The structure of the full-parameter probe for measuring the high-subsonic three-dimensional steady-state flow field is composed of a probe head (1), a probe support rod (2), a cylinder (3), a blunt cone (4), a pressure sensing left hole (5), a pressure sensing middle hole (6), a pressure sensing right hole (7), a pressure sensing upper hole (8), an insulating seal (9), a temperature sensor (10), a convection heat exchange left hole (11), a convection heat exchange middle hole (12), a convection heat exchange right hole (13), a temperature sensor cable lead-out channel (14), a pressure lead-out channel (15), a temperature sensor cable (16) and a pressure lead-out tube (17), and is characterized in that: The probe head (1) comprises a cylinder (3) and a blunt cone (4) with a common bottom surface. Four pressure sensing holes which are not connected to each other are opened on the windward surface of the probe head (1). Three pressure sensing holes are opened on the windward surface of the cylinder (3), namely, a left pressure sensing hole (5), a middle pressure sensing hole (6), and a right pressure sensing hole (7). One upper pressure sensing hole (8) is opened on the windward surface of the blunt cone (4). Three pressure sensing holes are opened on the leeward surface of the cylinder (3). The heat exchange holes are respectively a left heat exchange hole (11), a middle heat exchange hole (12), and a right heat exchange hole (13). A temperature sensor cable lead-out channel (14) is opened in the middle heat exchange hole (12) along the axis of the cylinder (3). The head of the temperature sensor (10) is placed in the middle heat exchange hole (12). The heat insulating seal (9) is located in the temperature sensor cable lead-out channel (14) to fix the temperature sensor (10); Furthermore, the diameter of the cylinder (3) is 2 mm to 6 mm, the length is 20 mm to 60 mm, the blunt cone (4) having the same bottom surface as the cylinder (3) has a cone angle of 90° to 120°, and the cone tip is a quarter spherical structure after being blunted. Four mutually unconnected pressure lead pipe lead channels (15) and a temperature sensor cable lead channel (14) are opened inside the cylinder (3) along the axial direction of the cylinder (3), and the four pressure lead pipe lead channels (15) are respectively connected to the pressure sensing left hole (5), the pressure sensing middle hole ( 6), the pressure sensing right hole (7) and the pressure sensing upper hole (8) are connected, the pressure lead pipe (17) is respectively connected with the pressure sensing left hole (5), the pressure sensing middle hole (6), the pressure sensing right hole (7) and the pressure sensing upper hole (8) and leads out of the tail of the probe support rod (2) through the pressure lead pipe lead channel (15), the temperature sensor cable (16) leads out of the tail of the probe support rod (2) through the temperature sensor cable lead channel (14), and the axis of the cylinder (3) of the probe head (1) coincides with the axis of the probe support rod (2); Furthermore, the pressure sensing left hole (5), the pressure sensing middle hole (6), the pressure sensing right hole (7), and the pressure sensing upper hole (8) are all circular, and have the same diameter of 0.2 mm to 1.2 mm. The center line of the pressure sensing middle hole (6) and the center line of the pressure sensing upper hole (8) are in the same plane as the axis of the cylinder (3) of the probe head (1). The pressure sensing left hole (5) and the pressure sensing right hole (7) are symmetrically distributed along the plane. The center lines of the holes (7) are coplanar and intersect with the axis of the cylinder (3), and the circumferential surface is perpendicular to the axis of the cylinder (3). The circumferential angles of the center points of the pressure-sensing left hole (5) and the pressure-sensing right hole (7) on the surface of the cylinder (3) are 60° to 120°. The distance between the center point of the pressure-sensing middle hole (6) and the arc of the bottom surface of the blunt-headed cone (4) is 0.6 mm to 1.2 mm. The distance between the center point of the pressure-sensing upper hole (8) and the arc of the bottom surface of the blunt-headed cone (4) is 0.4 mm to 1 mm. Furthermore, the center line of the convection heat exchange hole (12) coincides with the center line of the pressure sensing hole (6), the left convection heat exchange hole (11) and the right convection heat exchange hole (13) are symmetrically distributed along the center line of the convection heat exchange hole (12), the center line of the left convection heat exchange hole (11), the center line of the convection heat exchange hole (12), and the center line of the right convection heat exchange hole (13) are located on the same circumferential surface and intersect at one point, the circumferential surface is perpendicular to the axis of the cylinder (3), the intersection point is close to the leeward side of the cylinder (3), and the distance from the axis of the cylinder (3) is 0. .3 mm to 1 mm, the left convection heat exchange hole (11), the middle convection heat exchange hole (12), and the right convection heat exchange hole (13) are all circular, the diameter of the middle convection heat exchange hole (12) is 1 mm to 2 mm, the diameter of the left convection heat exchange hole (11) and the right convection heat exchange hole (13) is 0.3 mm to 0.8 mm, the distance between the center of the middle convection heat exchange hole (12) and the bottom arc of the blunt cone (4) is 0.6 mm to 1.2 mm, and the center line angle of the left convection heat exchange hole (11) and the right convection heat exchange hole (13) is 160°; Furthermore, the temperature sensor cable lead-out channel (14) is located in the convection heat exchange hole (12), and its axis is parallel to the axis of the cylinder (3), and the distance from the axis of the cylinder (3) is 0.6 mm to 2 mm. The head of the temperature sensor (10) is located on the center line of the convection heat exchange hole (12) and is fixed by the heat-insulating seal (9); The use steps are as follows: first, place the probe head in the flow field to be measured, and allow the fluid to be measured to flow through the probe head; second, measure the pressure of the three pressure sensing holes on the windward side; Step 3: Measure the temperature of the leeward temperature sensor; Step 4: Based on the data from the four pressure sensing holes and the temperature data measured by the temperature sensor, calculate the deflection angle coefficient and the pitch angle coefficient. Then, combined with the calibrated coefficient curve, interpolate to calculate the deflection angle, pitch angle, total pressure, static pressure and Mach number.

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