CN106950004A - A kind of pore pressure force probe of cylinder nine - Google Patents

Abstract

The invention belongs to the technical field of pressure testing, and discloses a cylindrical nine-hole pressure probe, which includes a probe, a support rod, and a pressure introduction tube. The probe is a cylinder, and the probe is fixed on the support rod. There are nine holes on the same side of the probe Pressure-sensing holes, each pressure-sensing hole is independently connected with one end of a pressure-inducing tube packaged in the probe, there is a channel inside the rod, and the other end of the nine pressure-inducing tubes is drawn out from the tail of the probe through the channel in the rod . The invention can measure the total pressure, static pressure, deflection angle and Mach number of the incoming flow at three spatial positions simultaneously after being calibrated by the wind tunnel, and is suitable for measuring the incoming flow of two-dimensional flow fields at the inlet, outlet, and interstage of turbomachinery blades The distribution of parameters along the blade height direction. Compared with the existing three-hole pressure probe for measuring the two-dimensional flow field, the time required for the measurement process is reduced by two-thirds, and the parameters of the two-dimensional flow field at the inlet, outlet, and interstage of the blade row can be completed in a relatively short period of time. Measurement of leaf height direction distribution and reduced test cost.

Description

A cylindrical nine-hole pressure probe

technical field

The invention belongs to the technical field of pressure testing, and relates to a two-dimensional flow field pressure measurement device, in particular to a cylindrical nine-hole pressure probe, which is suitable for measuring the flow deflection of the two-dimensional flow field between the inlet and outlet of blades in the flow channel of a turbomachinery Distribution of angle, total pressure, static pressure and Mach number along blade height.

Compared with the existing three-hole pressure probe, the time required for measurement is reduced by two-thirds, and it can complete the flow deflection angle, total pressure, static The measurement of pressure and Mach number distribution along the blade height direction can reduce the test cost.

Background technique

Experiments on compressors, turbines, pumps, fans, fans, etc. often need to measure the two-dimensional flow field parameters of the blade discharge inlet, outlet, and interstage in the flow channel, including incoming flow deflection angle, total pressure, static pressure, and Mach number, etc. along the blade height direction At present, the three-hole pressure probe is generally used, and the probe is driven to different leaf height positions by means of the probe displacement mechanism, and measured separately. Since it is a single-point measurement, the probe needs to be moved to complete the multi-point measurement. The experimental measurement time The longer the experiment, the higher the cost of the experiment.

In some tests, due to the short effective test time, only a few minutes, or even tens of seconds, the existing three-hole pressure probe cannot complete the two-dimensional testing of the inlet, outlet or interstage of the test piece within a given time. Measurement of the distribution of flow field parameters along the blade height direction.

Contents of the invention

The technical problem to be solved by the present invention is: aiming at the problem that the existing three-hole pressure probe cannot complete the distribution measurement of the two-dimensional flow field parameters of the test piece inlet, outlet or interstage along the blade height direction within a given time, a new method is invented. The cylindrical nine-hole pressure probe, compared with the existing three-hole pressure probe, reduces the measurement time by two-thirds, and can complete the two-dimensional flow field flow at the inlet, outlet or interstage of the test piece in a short time Measurement of deflection angle, total pressure, static pressure and Mach number distribution along blade height direction, and reduce test cost.

Technical solution of the present invention is:

1. A cylindrical nine-hole pressure probe, characterized in that: it includes a probe (1), a support rod (2), and a pressure introduction tube (3), the probe (1) is a cylinder, and the probe (1) is fixed On the support rod (2), there are 9 pressure sensing holes on the same side of the probe (1), namely hole 1 (4), hole 2 (5), hole 3 (6), hole 4 (7), hole 5(8), hole 6(9), hole 7(10), hole 8(11), hole 9(12), each pressure sensing hole and a pressure induction tube (3) are packaged in the probe (1) One end is connected independently, and a channel is opened in the support rod (2), and the other ends of the nine pressure-inducing tubes (3) pass through the channel in the support rod (2), and are led out from the tail of the probe.

2. Further, the centerlines of hole 1 (4), hole 2 (5), and hole 3 (6) are on a plane and perpendicular to the axis of the probe (1), and the centerline of hole 2 (5) is aligned with the probe (1) The axis is on a plane, and holes 1(4) and 3(6) are distributed symmetrically along this plane. , hole 2 (5), hole 3 (6) diameter is 0.2 mm to 1 mm.

3. Further, the centerlines of hole 4 (7), hole 5 (8), and hole 6 (9) are on a plane and perpendicular to the axis of the probe (1), and the centerline of hole 5 (8) is aligned with the probe (1) The axis is on one plane, holes 4(7) and holes 6(9) are distributed symmetrically along this plane, the angle between the center lines of holes 4(7) and holes 6(9) is 60° to 100°, hole 4(7) , hole 5 (8), hole 6 (9) diameter is 0.2 millimeter to 1 millimeter.

4. Further, the centerlines of hole 7 (10), hole 8 (11), and hole 9 (12) are on the same plane and perpendicular to the axis of the probe (1), and the centerline of hole 8 (11) and the probe (1) The axis is on a plane, and the holes 7 (10) and 9 (12) are distributed symmetrically along the plane. , Hole 8 (11), hole 9 (12) diameter is 0.2 millimeter to 1 millimeter.

5. Further, the distance between the center of the hole 2 (5) and the top surface of the probe (1) is 1 mm to 5 mm.

6. Further, the distance between hole 5 (8) and the centerline of hole 1 (4), hole 2 (5), and hole 3 (6) is 2 mm to 20 mm, and the distance between hole 5 (8) and hole 7 (10 ), the distance between the centerlines of hole 8 (11), and hole 9 (12) is 2 millimeters to 20 millimeters.

7. Further, the probe (1) has a diameter of 2 mm to 8 mm and a length of 6 mm to 50 mm.

8. Further, the diameter of the pressure induction pipe (3) is 0.2 mm to 1 mm.

9. Further, the support rod (2) is a cylinder with an outer diameter of 2 mm to 10 mm.

The invention can measure the total pressure, static pressure, deflection angle and Mach number of the incoming flow at three spatial positions simultaneously after being calibrated by the wind tunnel, and is suitable for measuring the incoming flow of two-dimensional flow fields at the inlet, outlet, and interstage of turbomachinery blades The distribution of parameters along the blade height direction. Compared with the existing three-hole pressure probe for measuring the two-dimensional flow field, the time required for the measurement process is reduced by two-thirds, and the parameters of the two-dimensional flow field at the inlet, outlet, and interstage of the blade row can be completed in a relatively short period of time. Measurement of leaf height direction distribution and reduced test cost.

Description of drawings

Fig. 1 is a schematic structural view of a cylindrical nine-hole pressure probe in an embodiment of the present invention.

Fig. 2 is a sectional view along the line A of Fig. 2 .

Among them: 1-probe, 2-strut, 3-pressure pipe, 4-hole 1, 5-hole 2, 6-hole 3, 7-hole 4, 8-hole 5, 9-hole 6, 10-hole 7, 11-hole 8, 12-hole 9.

detailed description

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

As shown in Figure 1, a cylindrical nine-hole pressure probe is introduced in this embodiment, including a probe (1), a support rod (2), and a pressure introduction tube (3), and the probe (1) is a cylinder , the probe (1) is fixed on the pole (2), and there are 9 pressure sensing holes on the same side of the probe (1), which are respectively hole 1 (4), hole 2 (5), hole 3 (6), hole 4(7), hole 5(8), hole 6(9), hole 7(10), hole 8(11), hole 9(12), each pressure sensing hole is packaged with a pressure induction tube (3) One end of the probe (1) is independently connected, and a channel is opened inside the support rod (2), and the other ends of the nine pressure-inducing tubes (3) are led out from the tail of the probe through the channel in the support rod (2).

The centerlines of hole 1 (4), hole 2 (5), and hole 3 (6) are on the same plane and perpendicular to the axis of the probe (1), and the centerline of hole 2 (5) is on the same plane as the axis of the probe (1) Above, hole 1(4) and hole 3(6) are distributed symmetrically along the plane, the angle between the centerlines of hole 1(4) and hole 3(6) is 90°, hole 1(4), hole 2(5), Hole 3 (6) has a diameter of 0.5 mm.

The centerlines of hole 4(7), hole 5(8), and hole 6(9) are on the same plane and perpendicular to the axis of the probe (1), and the centerline of hole 5(8) is on the same plane as the axis of the probe (1) On the top, holes 4(7) and holes 6(9) are symmetrically distributed along the plane, the angle between the center lines of holes 4(7) and holes 6(9) is 90°, holes 4(7), holes 5(8), The hole 6 (9) has a diameter of 0.5 mm.

The centerlines of hole 7 (10), hole 8 (11), and hole 9 (12) are on the same plane and perpendicular to the axis of the probe (1), and the centerline of hole 8 (11) is on the same plane as the axis of the probe (1) On the top, holes 7 (10), holes 9 (12) are symmetrically distributed along the plane, the angle between the center lines of holes 7 (10), holes 9 (12) is 90°, holes 7 (10), holes 8 (11), The hole 9 (12) has a diameter of 0.5 mm.

The distance between the center of hole 2 (5) and the top surface of the probe (1) is 2 millimeters.

The distance between hole 5(8) and the centerline of hole 1(4), hole 2(5) and hole 3(6) is 2 mm, and hole 5(8) and hole 7(10) and hole 8(11) 1. The distance between the plane where the center line of the hole 9 (12) is located is 2 millimeters.

The probe (1) has a diameter of 4 mm and a length of 10 mm.

The diameter of the pressure introduction pipe (3) is 0.5 mm.

The pole (2) is a cylinder with an outer diameter of 6 millimeters.

The invention can measure the total pressure, static pressure, deflection angle and Mach number of the incoming flow at three spatial positions at the same time through the calibration of the wind tunnel, and is suitable for measuring the incoming flow of the two-dimensional flow field at the inlet, outlet, and interstage two-dimensional flow field of the turbomachinery blade. The distribution of parameters along the blade height direction. Compared with the existing three-hole pressure probe for measuring the two-dimensional flow field, the time required for the measurement process is reduced by two-thirds, and the parameters of the two-dimensional flow field at the inlet, outlet, and interstage of the blade row can be completed in a relatively short period of time. Measurement of leaf height direction distribution and reduced test cost.

Claims (9)

1. A cylindrical nine-hole pressure probe is characterized in that: it comprises a probe (1), a pole (2), and a pressure pipe (3), and the probe (1) is a cylinder, and the probe (1) is fixed On the support rod (2), there are 9 pressure sensing holes on the same side of the probe (1), namely hole 1 (4), hole 2 (5), hole 3 (6), hole 4 (7), hole 5(8), hole 6(9), hole 7(10), hole 8(11), hole 9(12), each pressure sensing hole and a pressure induction tube (3) are packaged in the probe (1) One end is connected independently, and there is a channel inside the support rod (2), and the other ends of the nine pressure-inducing tubes (3) pass through the channel in the support rod (2), and are led out from the tail of the probe. 2. A kind of cylindrical nine-hole pressure probe according to claim 1, characterized in that: the centerlines of hole 1 (4), hole 2 (5), and hole 3 (6) are on a plane, and are connected to the probe ( 1) The axes intersect vertically, the centerline of hole 2 (5) and the axis of the probe (1) are on the same plane, hole 1 (4), hole 3 (6) are symmetrically distributed along this plane, hole 1 (4), hole 3 ( 6) The included angle of the center line is 60° to 100°, and the diameters of hole 1 (4), hole 2 (5), and hole 3 (6) are 0.2 mm to 1 mm. 3. A kind of cylinder nine hole pressure probe according to claim 1, is characterized in that: hole 4 (7), hole 5 (8), hole 6 (9) center line is on a plane, and probe ( 1) The axes intersect vertically, the center line of hole 5(8) and the axis of the probe (1) are on the same plane, holes 4(7), 6(9) are distributed symmetrically along this plane, hole 4(7), hole 6( 9) The included angle of the center line is 60° to 100°, and the diameters of hole 4 (7), hole 5 (8), and hole 6 (9) are 0.2 mm to 1 mm. 4. A kind of cylindrical nine hole pressure probe according to claim 1, is characterized in that: hole 7 (10), hole 8 (11), hole 9 (12) center line is on a plane, and probe ( 1) The axes intersect perpendicularly, the center line of hole 8 (11) and the axis of probe (1) are on the same plane, holes 7 (10) and holes 9 (12) are distributed symmetrically along this plane, holes 7 (10), holes 9 ( 12) The included angle of the center line is 60° to 100°, and the diameter of hole 7 (10), hole 8 (11), and hole 9 (12) is 0.2 mm to 1 mm. 5. A cylindrical nine-hole pressure probe according to claim 1, characterized in that the distance between the center of the hole 2 (5) and the top surface of the probe (1) is 1 mm to 5 mm. 6. A cylindrical nine-hole pressure probe according to claim 1, characterized in that: the plane where the centerlines of hole 5 (8) and hole 1 (4), hole 2 (5), and hole 3 (6) are located The distance is 2 mm to 20 mm, and the distance between the centerlines of hole 5 (8) and hole 7 (10), hole 8 (11), and hole 9 (12) is 2 mm to 20 mm. 7. A cylindrical nine-hole pressure probe according to claim 1, characterized in that: the probe (1) has a diameter of 2 mm to 8 mm and a length of 6 mm to 50 mm. 8. A cylindrical nine-hole pressure probe according to claim 1, characterized in that: the diameter of the pressure induction tube (3) is 0.2 mm to 1 mm. 9. A cylindrical nine-hole pressure probe according to claim 1, characterized in that: the strut (2) is a cylinder with an outer diameter of 2 mm to 10 mm.