CN106950003B - Conical single-hole dynamic pressure probe for measuring rotor outlet transonic three-dimensional flow field - Google Patents

Abstract

The invention belongs to the technical field of pressure testing, and discloses a conical single-hole dynamic pressure probe for measuring transonic three-dimensional flow field at a rotor outlet. A dynamic pressure sensor is encapsulated inside, and a pressure sensing hole is opened on the side of the probe cone. The hole is communicated with the dynamic pressure sensor in the probe head, and the sensor cable leads out the probe through the channel in the probe support rod. tail. The invention can measure the three-dimensional flow parameters such as pitch angle, deflection angle, total pressure, static pressure and Mach number of the transonic three-dimensional flow field with a large positive pitch angle at the rotor outlet from the pressure surface to the suction surface after the calibration of the calibrated wind tunnel. Circumferential distribution provides measured data basis for improving rotor performance. Compared with the porous dynamic pressure probe for measuring transonic three-dimensional flow field, only one dynamic pressure sensor is installed in the head, which has the advantages of simple structure, small size and low cost.

Description

A conical single-hole dynamic pressure probe for measuring transonic three-dimensional flow field at rotor outlet

technical field

The invention belongs to the technical field of pressure testing, relates to a dynamic pressure measuring device for a transonic flow field, and in particular relates to a conical single-hole dynamic pressure probe for measuring a transonic three-dimensional flow field at the rotor outlet, which is suitable for measuring the rotor outlet of an impeller machine with a large positive pressure. The transonic three-dimensional flow field of the pitch angle can measure the circumferential distribution of three-dimensional flow parameters such as the incoming flow pitch angle, deflection angle, total pressure, static pressure and Mach number from the pressure surface to the suction surface.

Background technique

Due to the rotation of rotors such as transonic compressors, fans, and turbines, conventional steady-state pressure probes cannot truly reflect the dynamic flow field at the rotor outlet, and cannot measure the circumferential direction of the flow parameters from the pressure surface to the suction surface at the rotor outlet. Distribution, the hot wire anemometer can measure the dynamic velocity signal at the rotor outlet, but cannot provide dynamic pressure information. In the transonic turbine test, it is more desirable to obtain the measurement data containing dynamic pressure information at the rotor outlet. For the transonic three-dimensional flow field at the rotor outlet, due to the centrifugal force, it generally has a large positive pitch angle. It is hoped to obtain the rotor outlet pitch angle and deflection angle. Circumferential distribution of three-dimensional flow parameters such as total pressure, static pressure, and Mach number from the pressure side to the suction side for validating rotor design and flow field diagnostics for improved machine performance.

The existing dynamic pressure probe for measuring transonic three-dimensional flow parameters at the rotor outlet has at least two pressure sensing holes, and two dynamic pressure sensors are installed inside. On the one hand, the size of the dynamic pressure probe is not easy to make small, Dynamic pressure probes are too expensive.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: measuring the three-dimensional flow parameters such as pitch angle, deflection angle, total pressure, static pressure and Mach number from the pressure surface to the suction surface in the transonic three-dimensional flow field with a large positive pitch angle at the rotor outlet. Circumferential distribution.

Therefore, the present invention provides a conical single-hole dynamic pressure probe for measuring the transonic three-dimensional flow field at the rotor outlet. Compared with the porous dynamic pressure probe, only one dynamic pressure sensor is installed on the head, which is relatively simple in structure. , small size and low cost, it is suitable for measuring the three-dimensional flow parameters such as pitch angle, deflection angle, total pressure, static pressure and Mach number in the transonic three-dimensional flow field with a large positive pitch angle at the rotor outlet from the pressure surface to the suction force. Circumferential distribution of the surface.

The technical solution of the present invention is:

1. A conical single-hole dynamic pressure probe for measuring transonic three-dimensional flow field at rotor outlet, characterized in that it comprises a probe head (1) and a support rod (2), and the probe head (1) includes A cylinder (3) and a cone (4) with a common bottom surface encapsulate a dynamic pressure sensor inside, and a pressure sensing hole (5) is opened on the side surface of the cone (4) of the probe head (1). , the pressure sensing hole (5) communicates with the dynamic pressure sensor packaged in the probe head (1). The center line of the pressure sensing hole (5) is on the same plane as the axis of the cylinder (3) of the probe head (1). The axis of the cylinder (3) of the probe head (1) coincides with the axis of the probe support rod (2).

2. Further, the diameter of the pressure sensing hole (5) of the probe head (1) is 0.6 mm to 1.5 mm, and the distance between the center of the pressure sensing hole (5) and the circumference of the bottom surface of the cone (4) is 1 mm to 5 mm .

3. Further, the diameter of the cylinder (3) of the probe head (1) is 1.5 mm to 6 mm.

4. Further, the cone angle of the cone (4) of the probe head (1) is 40° to 160°.

5. Further, the cylinder (3) of the probe head (1) is 10 mm to 40 mm long.

6. Further, the probe support rod (2) is a cylinder, and a circular pipe is opened inside the probe head (1), and the cable (6) of the dynamic pressure sensor packaged in the probe head (1) passes through the probe support rod (2). The inner pipe leads out the probe tail.

The beneficial effects of the present invention are:

The invention can measure the three-dimensional flow parameters such as pitch angle, deflection angle, total pressure, static pressure and Mach number of the transonic three-dimensional flow field with a large positive pitch angle at the rotor outlet from the pressure surface to the suction surface after the calibration of the calibrated wind tunnel. Circumferential distribution provides measured data basis for improving rotor performance. Compared with the porous dynamic pressure probe for measuring transonic three-dimensional flow field, only one dynamic pressure sensor is installed in the head, which has the advantages of simple structure, small size and low cost.

Description of drawings

FIG. 1 is a schematic structural diagram of a conical single-hole dynamic pressure probe for measuring a transonic three-dimensional flow field at a rotor outlet in an embodiment of the present invention.

Among them: 1-probe head, 2-probe rod, 3-cylinder, 4-cone, 5-pressure sensing hole, 6-cable.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figure 1, this embodiment introduces a conical single-hole dynamic pressure probe for measuring transonic three-dimensional flow field at the rotor outlet, including a probe head (1) and a support rod (2). The probe head (1) It includes a cylinder (3) and a cone (4) with a common bottom surface, a dynamic pressure sensor is encapsulated inside, and a pressure sensor is opened on the side of the cone (4) of the probe head (1). The hole (5), the pressure sensing hole (5) communicates with the dynamic pressure sensor packaged in the probe head (1). The center line of the pressure sensing hole (5) is on the same plane as the axis of the cylinder (3) of the probe head (1). The axis of the cylinder (3) of the probe head (1) coincides with the axis of the probe support rod (2).

The diameter of the pressure sensing hole (5) of the probe head (1) is 0.6 mm, and the distance between the center of the pressure sensing hole (5) and the circumference of the bottom surface of the cone (4) is 2.1 mm.

The diameter of the cylinder (3) of the probe head (1) is 3 mm.

The cone (4) of the probe head (1) has a cone angle of 90°.

The cylinder (3) of the probe head (1) is 35 mm long.

The probe support rod (2) is a cylinder with a diameter of 6 mm, and a circular channel is opened in the interior with a diameter of 4 mm. The cable (6) of the dynamic pressure sensor packaged in the probe head (1) passes through the probe support rod. The pipe inside the rod (2) leads out the probe tail.

The conical single-hole dynamic pressure probe for measuring the transonic three-dimensional flow field at the rotor outlet introduced in the embodiment of the present invention can be calibrated by the transonic velocity calibration wind tunnel, and the calibration data can be obtained. When actually measuring the transonic three-dimensional flow field at the rotor outlet, the conical single-hole dynamic pressure probe rotates around the axis of the probe support rod, and is placed in several different angular positions for measurement respectively. Obtain several sets of unsteady pressure data, and use the obtained transonic calibration wind tunnel calibration data for data processing to obtain the pitch angle, yaw angle, total pressure, static pressure in the transonic three-dimensional flow field with a large positive pitch angle at the rotor outlet. Circumferential distribution of three-dimensional flow parameters such as pressure and Mach number from the pressure side to the suction side.

Claims (1)

1. A conical single-hole dynamic pressure probe measuring a transonic three-dimensional flow field at a rotor outlet, characterized in that: comprising a probe head (1), a strut (2), and the probe head (1) includes A cylinder (3) and a cone (4) with a common bottom surface encapsulate a dynamic pressure sensor inside, and a pressure sensing hole (5) is opened on the side surface of the cone (4) of the probe head (1). , the pressure sensing hole (5) is in communication with the dynamic pressure sensor packaged in the probe head (1); the center line of the pressure sensing hole (5) and the axis of the cylinder (3) of the probe head (1) are in On the same plane; the axis of the cylinder (3) of the probe head (1) coincides with the axis of the probe support rod (2); The probe support rod (2) is a cylinder, a circular pipe is opened inside the probe head (1), and the cable (6) of the dynamic pressure sensor packaged in the probe head (1) passes through the probe support rod (2). The pipe leads to the tail of the probe; The diameter of the pressure sensing hole (5) of the probe head (1) is 0.6 mm to 1.5 mm, and the distance between the center of the pressure sensing hole (5) and the circumference of the bottom surface of the cone (4) is 1 mm to 5 mm; The diameter of the cylinder (3) of the probe head (1) is 1.5 mm to 6 mm; The cone angle of the cone (4) of the probe head (1) is 40° to 160°; The cylinder (3) of the probe head (1) is 10 mm to 40 mm long; Compared with the porous dynamic pressure probe, the conical single-hole dynamic pressure probe for measuring the transonic three-dimensional flow field at the rotor outlet has only one dynamic pressure sensor installed on the head, which is relatively simple in structure, small in size and low in cost. It is suitable for measuring the circumferential distribution of the three-dimensional flow parameters of pitch angle, deflection angle, total pressure, static pressure and Mach number from the pressure surface to the suction surface in the transonic three-dimensional flow field with a large positive pitch angle at the rotor outlet.

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