CN106950005A - It is a kind of to measure any direction to flow the cylinder octal pressure probe of two-dimensional flow parameter - Google Patents

Abstract

The invention belongs to the technical field of pressure testing, and discloses a cylindrical eight-hole pressure probe for measuring two-dimensional flow parameters of incoming flow in any direction, including a probe head and a support rod. The probe head is a cylindrical structure. There are 8 pressure-sensing holes that are not connected to each other evenly along the circumference of the surface. The centerlines of these 8 holes are on the same plane, which is perpendicular to the cylinder axis of the probe head. The 8 pressure-sensing holes are respectively connected to the The 8 pressure introduction tubes packaged in the probe head are connected, and the pressure introduction tubes lead out to the tail of the probe through the inner channel of the probe support rod. Compared with the existing pressure probe, the present invention is calibrated and can simultaneously measure the total pressure, static pressure, Mach number and flow direction of the incoming flow in any direction within the plane where eight pressure sensing holes are located, and is suitable for measuring aviation Engines, compressors, fans, etc. have a two-dimensional complex flow field of backflow at the inlet, outlet, and stage of the blade discharge during the process of panting.

Description

A cylindrical eight-hole pressure probe for measuring two-dimensional flow parameters of incoming flow in any direction

technical field

The invention belongs to the technical field of pressure testing, and relates to a pressure measuring device of a two-dimensional flow field, in particular to a cylindrical eight-hole pressure probe for measuring two-dimensional flow parameters of incoming flow in any direction, which is suitable for measuring aero-engines, compressors, fans, etc. During the forced panting process, there is a two-dimensional complex flow field of backflow at the blade row inlet, outlet, and between stages.

Background technique

Pressure probes, such as three-hole pressure probes, five-hole pressure probes, and seven-hole pressure probes, are widely used in aero-engines, gas turbines, compressors, fans, and pumps due to their simple structure, durability, and easy operation. Isostatic flow field measurement. Three-hole pressure probes are used to measure two-dimensional flow parameters, and five-hole pressure probes and seven-hole pressure probes are used to measure three-dimensional flow parameters. However, the range of the three-hole pressure probe and the five-hole pressure probe to measure the incoming flow direction is limited, generally not exceeding ±45°. The angle range of the incoming flow measured by the seven-hole pressure probe generally does not exceed ±70°.

When measuring a flow field with an unknown direction of flow, if these probes are not roughly aligned with the direction of flow when installed, exceeding the effective angle measurement range of the probes, although the data obtained from the pressure sensing hole measurement, the flow cannot be calculated. Direction, total pressure, static pressure and other flow parameters.

When there is backflow in the measured flow field, the commonly used three-hole pressure probe, five-hole pressure probe or seven-hole pressure probe cannot complete accurate measurement, especially for aero-engines, gas turbines, compressors, fans, compressors, turbines For the measurement of complex internal flow fields such as fans, pumps, etc., there is a lack of engineering and practical pressure probe technology that can take into account the measurement of backflow.

Contents of the invention

The technical problem mainly solved by the present invention is: in the measurement of complex internal flow fields of aero-engines, gas turbines, compressors, turbines, fans, pumps, etc., there is a lack of engineering and practical pressure probe technology that can take into account the measurement of backflow, and to invent a method for measuring any The cylindrical eight-hole pressure probe with two-dimensional flow parameters of direction and incoming flow can measure the two-dimensional complex flow field deflection angle, Total pressure, static pressure, Mach number.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

1. A cylindrical eight-hole pressure probe for measuring two-dimensional flow parameters of incoming flow in any direction, characterized in that it includes a probe head (1) and a support rod (2), and the probe head (1) is The cylindrical structure has 8 pressure sensing holes (3) that are not connected to each other evenly along the circumference of the cylindrical surface, and the angle between the centerlines of two adjacent pressure sensing holes (3) is 45°. The center line of the pressure sensing hole (3) is on the same plane, which is perpendicular to the cylinder axis of the probe head (1), and the 8 pressure sensing holes (3) and 8 pressure induction tubes (4) are packaged in the probe One end in the head (1) communicates with each other.

2. Further, the probe support rod (2) is a cylinder with a circular channel inside, and the 8 pressure induction tubes (4) packaged in the probe head (1) pass through the inner channel of the probe support rod (2) , elicited from the tail of the probe.

3. Further, the plane where the centers of the 8 pressure sensing holes (3) of the probe head (1) are located is not less than 1 mm from the top surface (5) of the probe head (1).

4. Further, the diameter of the 8 pressure sensing holes (3) on the probe head (1) is 0.2 mm to 1 mm.

5. Further, the probe head (1) has a diameter of 4 mm to 8 mm and a length of 10 mm to 50 mm.

The beneficial effects of the present invention are:

After a calibration experiment, the present invention obtains the data of eight pressure sensing holes of a cylindrical eight-hole pressure probe under different flow directions under the condition of known total flow pressure, static pressure and flow direction, and sorts out the characteristics of the total pressure , static pressure characteristics and deflection angle characteristics three curves. During the actual measurement, the pressure data felt by the eight pressure-sensing holes is measured by the eight-hole cylindrical pressure probe, and the total pressure, static pressure, Mach number and deflection angle data.

Compared with the prior art, adopting the cylindrical eight-hole pressure probe of the present invention can achieve the following technical effects:

1. After the probe is installed, there is no need to adjust the installation angle of the probe during measurement.

2. It can measure the flow deflection angle, total pressure, static pressure, and Mach number when the flow direction is unknown, the flow direction changes greatly, the installation angle cannot be adjusted after the probe is installed, and there is backflow.

It can be applied to the measurement of the two-dimensional complex flow field where there is backflow at the inlet, outlet, and interstage of the blade row in the process of aero-engine, compressor, fan, etc.

Description of drawings

Fig. 1 is a schematic structural diagram of a cylindrical eight-hole pressure probe for measuring two-dimensional flow parameters of incoming flow in any direction in an embodiment of the present invention.

Among them: 1-probe head, 2-probe support rod, 3-pressure sensing hole, 4-pressure induction tube, 5-top surface.

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, this embodiment introduces a cylindrical eight-hole pressure probe for measuring the two-dimensional flow parameters of incoming flow in any direction, including a probe head (1), a support rod (2), and a probe head (1) is a cylindrical structure, and there are 8 pressure sensing holes (3) that are not connected to each other evenly along the circumference of the cylindrical surface, and the angle between the centerlines of two adjacent pressure sensing holes (3) is 45° , the centerlines of these 8 pressure sensing holes (3) are on the same plane, which is perpendicular to the cylinder axis of the probe head (1), and the 8 pressure sensing holes (3) and the 8 pressure induction tubes (4) The ends encapsulated in the probe head (1) are connected to each other.

The probe support rod (2) is a cylinder with a diameter of 6 mm. There is a circular channel inside it with a diameter of 4 mm. 2) The inner channel is drawn out from the tail of the probe.

The plane where the centers of the 8 pressure sensing holes (3) of the probe head (1) are located is 2 millimeters away from the top surface (5) of the probe head (1).

The eight pressure sensing holes (3) of the probe head (1) have a diameter of 0.4 mm.

The probe head (1) has a diameter of 4 mm and a length of 40 mm.

After a calibration experiment, the present invention obtains the data of eight pressure sensing holes of a cylindrical eight-hole pressure probe under different flow directions under the condition of known total flow pressure, static pressure and flow direction, and sorts out the characteristics of the total pressure , static pressure characteristics and deflection angle characteristics three curves. During the actual measurement, the pressure data felt by the eight pressure-sensing holes is measured by the eight-hole cylindrical pressure probe, and the total pressure, static pressure, Mach number and deflection angle data. It can measure the deflection angle, total pressure, static pressure, and Mach number of the two-dimensional complex flow field where there is backflow at the inlet, outlet, and interstage of the blade row of the aero-engine, compressor, fan, etc., and is also suitable for measuring incoming flow The direction is unknown, the flow direction changes greatly, the installation angle cannot be adjusted after the probe is installed, and there is a two-dimensional complex flow field with backflow.

Claims (5)

1. A cylindrical eight-hole pressure probe for measuring two-dimensional flow parameters in any direction, characterized in that: it comprises a probe head (1), a pole (2), and the probe head (1) is The cylindrical structure has 8 pressure sensing holes (3) that are not connected to each other evenly along the circumference of the cylindrical surface, and the angle between the centerlines of two adjacent pressure sensing holes (3) is 45°. The center line of the pressure sensing hole (3) is on the same plane, which is perpendicular to the cylinder axis of the probe head (1), and the 8 pressure sensing holes (3) and 8 pressure induction tubes (4) are packaged in the probe One end in the head (1) communicates with each other. 2. A cylindrical eight-hole pressure probe for measuring two-dimensional flow parameters of incoming flow in any direction according to claim 1, characterized in that: the probe support rod (2) is a cylinder, and a circular channel is opened inside it , the eight pressure-inducing tubes (4) packaged in the probe head (1) pass through the inner channel of the probe support rod (2) and are led out from the probe tail. 3. A cylindrical eight-hole pressure probe for measuring two-dimensional flow parameters of incoming flow in any direction according to claim 1, characterized in that: where the centers of the eight pressure sensing holes (3) of the probe head (1) are located The distance from the top surface (5) of the probe head (1) is not less than 1 mm. 4. A cylindrical eight-hole pressure probe for measuring two-dimensional flow parameters of incoming flow in any direction according to claim 1, characterized in that: the diameters of the eight pressure sensing holes (3) of the probe head (1) are 0.2 mm to 1 mm. 5. A cylindrical eight-hole pressure probe for measuring two-dimensional flow parameters of incoming flow in any direction according to claim 1, characterized in that: the diameter of the probe head (1) is 4 mm to 8 mm, 10 mm to 50 mm long.