A cylindrical four-hole pressure probe for measuring unsteady three-dimensional flow fields

Abstract

The present invention relates to a cylindrical four-hole pressure probe for measuring unsteady three-dimensional flow fields, comprising a cylinder, an inclined surface arranged at the lower end of the cylinder, three independent pressure measuring holes at the same height along the cylindrical surface near the inclined surface, a temperature sensing hole arranged below the middle pressure measuring hole, a lower hole arranged at the inclined surface as a pressure measuring hole, four pressure-conducting channels for installing micro pressure sensors arranged along the circumference of the cylinder, a temperature sensor channel for installing a temperature sensor arranged in the middle, and the four pressure-conducting channels respectively connected to the four pressure measuring holes, and the temperature sensor channel connected to the temperature sensing hole. Compared with the existing pressure probe, the present invention can directly install the micro pressure sensor in the pressure-conducting channel, reduce the length and volume of the pressure transmission tube cavity of the probe, eliminate the influence of its damping effect on the high-frequency pulsating pressure measurement, and provide a reliable method for testing the unsteady three-dimensional flow field between the turbine and compressor stages of a gas turbine.

Description

Technical Field

[0001] The present invention relates to a gas turbine internal flow field test probe, in particular to a cylindrical four-hole pressure probe, which is suitable for measuring non-steady-state three-dimensional flow field parameters such as total pressure, static pressure, deflection angle, pitch angle, speed, etc. between stages of gas turbine turbines and compressors. Background Art

[0002] Reliable flow field measurements of turbine and compressor cascades are essential for validating the numerical design process of gas turbines. The internal flow field of a gas turbine is inherently unstable. These instabilities are mainly caused by phenomena such as wake, secondary flow, tip clearance flow and blade interaction. The frequency range of these phenomena extends to the higher harmonics of the blade pass frequency, which can be as high as 5–20kHz. It is difficult to obtain accurate 3D flow field information with ordinary long pressure tube probe solutions. Summary of the invention

[0003] The problem to be solved by the present invention is to provide a cylindrical four-hole pressure probe for measuring unsteady three-dimensional flow fields. The probe has excellent performance, and a micro pressure sensor can be directly installed in a pressure-conducting channel, thereby reducing the length and volume of the probe pressure transmission tube cavity, eliminating the influence of its damping effect on the high-frequency pulsating pressure measurement, so that it can be used in the unsteady three-dimensional flow field test between gas turbine turbines and compressor stages to obtain parameters such as total pressure, static pressure, deflection angle, pitch angle, speed, etc.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a cylindrical four-hole pressure probe for measuring non-steady-state three-dimensional flow fields, including a cylinder and an inclined surface arranged at the lower end of the cylinder, three independent pressure measuring holes are opened along the cylindrical surface at the same height near the inclined surface, a temperature sensing hole is opened below the middle pressure measuring hole, and a lower hole is opened at the inclined surface as a pressure measuring hole, four pressure conducting channels for installing micro pressure sensors are arranged along the circumference of the cylinder, a temperature sensor channel for installing a temperature sensor is arranged in the middle, and the four pressure conducting channels are respectively connected to the four pressure measuring holes, and the temperature sensor channel is connected to the temperature sensing hole.

[0005] Furthermore, the cylinder has a diameter of 5 mm to 5.8 mm, a length of 35 mm to 45 mm, and an inclination angle of 40° to 50°.

[0006] Furthermore, the three independent pressure measuring holes are located at the same height, wherein the right hole and the left hole are located on both sides of the middle hole, respectively, with an included angle of 110° to 130°.

[0007] Furthermore, the middle hole is located on the cylindrical surface near the bevel, with a distance from the lower edge of the bevel of 12.5 mm to 17.5 mm, a diameter of the middle hole of 0.2 mm to 0.4 mm, an axis of the middle hole perpendicular to the cylindrical surface, and connected to the middle hole pressure-conducting channel.

[0008] Furthermore, the axis of the lower hole is perpendicular to the inclined plane and is in the same vertical position as the middle hole. The diameter of the lower hole is 0.2 mm to 0.4 mm and is connected to the lower hole pressure conducting channel.

[0009] Furthermore, the diameters of the right hole and the left hole are 0.2 mm to 0.4 mm, and they form an angle of 25° to 35° with the cross section of the cylinder, and are respectively connected to the right hole pressure conducting channel and the left hole pressure conducting channel.

[0010] Furthermore, the diameter of the pressure-conducting channel is 1.4 mm to 1.8 mm, and the diameter of the temperature sensor channel is 0.6 mm to 1.0 mm.

[0011] The beneficial effects of the present invention are:

[0012] Compared with the existing pressure probes, the present invention can directly install the micro pressure sensor in the pressure-conducting channel, reduce the length and volume of the probe pressure-transmitting tube cavity, eliminate the influence of its damping effect on the high-frequency pulsating pressure measurement, and provide a reliable method for testing the unsteady three-dimensional flow field between the turbine and compressor stages of a gas turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 1 is a schematic structural diagram of a cylindrical four-hole pressure probe for measuring an unsteady three-dimensional flow field in an embodiment of the present invention;

[0014] Figure 2 is a top view of 1;

[0015] Figure 3 is the right view of 1;

[0016] In the figure: 1-cylinder, 2-inclined surface, 3-middle hole, 4-right hole, 5-left hole, 6-lower hole, 7-temperature sensing hole, 8-middle hole pressure conducting channel, 9-right hole pressure conducting channel, 10-left hole pressure conducting channel, 11-lower hole pressure conducting channel, 12-temperature sensor channel. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figures 1 to 3As shown, a cylindrical four-hole pressure probe for measuring unsteady three-dimensional flow field in this embodiment includes a cylinder 1, an inclined surface 2 set at the lower end of the cylinder 1, and three independent pressure measuring holes are opened along the surface of the cylinder 1 at the same height near the inclined surface 2, namely, the middle hole 3, the right hole 4, and the left hole 5. A temperature sensing hole 7 is also opened below the middle hole 3, and a lower hole 6 for pressure measurement is opened at the inclined surface 2. Four pressure-conducting channels for installing micro pressure sensors are arranged along the circumference of the cylinder 1, namely, the middle hole pressure-conducting channel 8, the right hole pressure-conducting channel 9, the left hole pressure-conducting channel 10, and the lower hole pressure-conducting channel 11, and a temperature sensor channel 12 for installing a temperature sensor is arranged in the middle, and the four pressure-conducting channels are respectively connected to the four pressure measuring holes, and the temperature sensor channel 12 is connected to the temperature sensing hole 7.

[0019] Preferably, the cylinder 1 has a diameter of 5 mm to 5.8 mm, a length of 35 mm to 45 mm, and a slope 2 at one end, with an inclination angle of 40° to 50°.

[0020] Preferably, the cylinder 1 has a diameter of 5.4 mm, a length of 40 mm, and one end is a slope 2 with an inclination angle of 45°.

[0021] Preferably, the middle hole 3 is located on the surface of the cylinder 1 near the bevel 2, with a distance of 12.5 mm to 17.5 mm from the lower edge of the bevel. The axis of the middle hole 3 is perpendicular to the cylindrical surface. The diameter of the middle hole is 0.2 mm to 0.4 mm, and it is connected to the middle hole pressure conducting channel 8.

[0022] Preferably, the middle hole 3 is located on the surface of the cylinder 1 near the inclined surface 2, 125 mm away from the lower edge of the inclined surface, the axis of the middle hole 3 is perpendicular to the cylindrical surface, the diameter of the middle hole is 0.3 mm, and it is connected to the middle hole pressure conducting channel 8.

[0023] Preferably, the axis of the lower hole 6 is perpendicular to the inclined surface 2 , and is in the same vertical position as the middle hole 5 . The diameter of the lower hole is 0.2 mm to 0.4 mm, and the lower hole is connected to the lower hole pressure-conducting channel 11 .

[0024] Preferably, the axis of the lower hole 6 is perpendicular to the inclined surface 2 , and is in the same vertical position as the middle hole 5 . The lower hole has a diameter of 0.3 mm and is connected to the lower hole pressure-conducting channel 11 .

[0025] Preferably, the middle hole 3, the right hole 4 and the left hole 5 are at the same height, and the right hole 4 and the left hole 5 are respectively located on both sides of the middle hole 3, with an included angle of 110° to 130°.

[0026] Preferably, the middle hole 3, the right hole 4 and the left hole 5 are at the same height, and the right hole 4 and the left hole 5 are respectively located on both sides of the middle hole 3, with an included angle of 120°.

[0027] Preferably, the right hole 4 and the left hole 5 have a diameter of 0.2 mm to 0.4 mm, form an angle of 25° to 35° with the cross section of the cylinder 1, and are connected to the right hole pressure conducting channel 9 and the left hole pressure conducting channel 10 respectively.

[0028] Preferably, the right hole 4 and the left hole 5 have a diameter of 0.3 mm, form an angle of 30° with the cross section of the cylinder 1, and are connected to the right hole pressure conducting channel 9 and the left hole pressure conducting channel 10 respectively.

[0029] Preferably, a temperature sensing hole 7 is provided below the middle hole 3 .

[0030] Preferably, the end surface of the cylinder 1 has a middle hole pressure conducting channel 8, a right hole pressure conducting channel 9, a left hole pressure conducting channel 10, and a lower hole pressure conducting channel 11, with diameters of 1.4 mm to 1.8 mm, and the temperature sensor channel 12 has a diameter of 0.6 mm to 1.0 mm.

[0031] Preferably, the end surface of the cylinder 1 has a middle hole pressure conducting channel 8, a right hole pressure conducting channel 9, a left hole pressure conducting channel 10, and a lower hole pressure conducting channel 11, with a diameter of 1.6 mm, and the temperature sensor channel 12 has a diameter of 0.8 mm.

[0032] The cylindrical four-hole pressure probe for measuring unsteady three-dimensional flow fields introduced in the example of the present invention can directly install a micro pressure sensor in a pressure-conducting channel, reduce the length and volume of the probe pressure transmission tube cavity, eliminate the influence of its damping effect on high-frequency pulsating pressure measurement, and is applied to the unsteady three-dimensional flow field test between gas turbine turbine and compressor stages.

Claims

1. A cylindrical four-hole pressure probe for measuring unsteady three-dimensional flow fields, characterized in that: It includes a cylinder and an inclined surface arranged at the lower end of the cylinder. Three independent pressure measuring holes are opened along the cylindrical surface at the same height near the inclined surface. A temperature sensing hole is opened below the middle pressure measuring hole. A lower hole is opened at the inclined surface as a pressure measuring hole. Four pressure conducting channels for installing micro pressure sensors are arranged along the circumference of the cylinder. The micro pressure sensors are directly installed in the pressure conducting channels to reduce the length and volume of the probe pressure transmission cavity and eliminate the influence of its damping effect on the high-frequency pulsating pressure measurement. A temperature sensor channel for installing a temperature sensor is arranged in the middle, and the four pressure conducting channels are connected to the four pressure measuring holes respectively, and the temperature sensor channel is connected to the temperature sensing hole. The three independent pressure measuring holes Located at the same height, the right hole and the left hole are respectively located on both sides of the middle hole, with an included angle of 110° to 130°; the middle hole is located on the cylindrical surface near the inclined surface, with a distance of 12.5 mm to 17.5 mm from the lower edge of the inclined surface, the middle hole diameter is 0.2 mm to 0.4 mm, the middle hole axis is perpendicular to the cylindrical surface, and is connected to the middle hole pressure conducting channel; the right hole and the left hole have a diameter of 0.2 mm to 0.4 mm, and form an included angle of 25° to 35° with the cross section of the cylinder, and are respectively connected to the right hole pressure conducting channel and the left hole pressure conducting channel; the axis of the lower hole is perpendicular to the inclined surface, and is in the same vertical position as the middle hole, the lower hole diameter is 0.2 mm to 0.4 mm, and is connected to the lower hole pressure conducting channel.

2. The cylindrical four-hole pressure probe for measuring unsteady three-dimensional flow field according to claim 1, characterized in that: The cylinder has a diameter of 5 mm to 5.8 mm, a length of 35 mm to 45 mm, and an inclination angle of 40° to 50°.

3. The cylindrical four-hole pressure probe for measuring unsteady three-dimensional flow field according to claim 1, characterized in that: The diameter of the pressure-conducting channel is 1.4 mm to 1.8 mm, and the diameter of the temperature sensor channel is 0.6 mm to 1.0 mm.

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