CN106840512B - Four-hole dynamic pressure probe for measuring supersonic three-dimensional unsteady flow field - Google Patents

Four-hole dynamic pressure probe for measuring supersonic three-dimensional unsteady flow field Download PDF

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Publication number
CN106840512B
CN106840512B CN201710134910.2A CN201710134910A CN106840512B CN 106840512 B CN106840512 B CN 106840512B CN 201710134910 A CN201710134910 A CN 201710134910A CN 106840512 B CN106840512 B CN 106840512B
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China
Prior art keywords
hole
probe
probe head
plane
wedge
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CN201710134910.2A
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Chinese (zh)
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CN106840512A (en
Inventor
马宏伟
马融
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北京航空航天大学
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/26Details or accessories
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00Measuring or testing not otherwise provided for
    • G01D21/02Measuring two or more variables by means not covered by a single other subclass

Abstract

The invention belongs to the technical field of pressure testing, and discloses a four-hole dynamic pressure probe for measuring a supersonic three-dimensional unsteady flow field, which comprises a probe head and a support rod, wherein the probe head is of a wedge-top triangular prism structure, 4 dynamic pressure sensors are packaged in the probe head, the windward side of the probe head comprises a wedge-top inclined plane, a left side surface and a right side surface during measurement, 1 pressure sensing hole is respectively arranged on the front edge of the junction of the wedge-top inclined plane, the left side surface, the right side surface and the left and right side surfaces of the probe head, and is respectively communicated with the 4 dynamic pressure sensors, and cables of the 4 dynamic pressure sensors are led out of the tail part of the probe through an inner channel of the support. Compared with the existing pressure probe, the method can simultaneously measure the change of total pressure, static pressure, deflection angle, pitch angle and Mach number of the ultrasonic incoming flow along with time after calibration of the wind tunnel, and provides a means for efficiently and accurately measuring the parameters of the ultrasonic three-dimensional unsteady flow field for a turbine experiment.

Description

Four-hole dynamic pressure probe for measuring supersonic three-dimensional unsteady flow field

Technical Field

The invention belongs to the technical field of pressure testing, relates to a dynamic pressure measuring device of a supersonic three-dimensional unsteady flow field, and particularly relates to a four-hole dynamic pressure probe for measuring the supersonic three-dimensional unsteady flow field, which is suitable for testing supersonic three-dimensional dynamic flow fields at an inlet, an outlet and an interstage of an impeller machine.

Background

The three-dimensional flow field between the stages of the ultrasonic compressor is unusual in nature due to fluid viscosity, shock waves, rotation of a rotor, existence of blade tip gaps, staggered arrangement of movable and static blade rows and the like. The dynamic characteristics of a flow field cannot be measured by adopting a conventional steady-state pressure probe, and a hot wire anemometer can measure a dynamic speed signal but cannot measure pressure information. For turbomachines, researchers prefer to obtain interstage, rotor outlet dynamic pressure profiles for verification of design and flow field diagnostics in order to improve machine performance.

At present, because of the lack of a practical dynamic testing technology of engineering, steady-state measuring technologies such as a five-hole pressure probe are generally adopted in engineering, and the pressure probe is driven to move to a measured position by a displacement mechanism arranged on a casing to measure a supersonic three-dimensional flow field. The stable five-hole pressure probe has a longer pressure guiding pipe inside, so that the formed cavity effect damps dynamic pressure information of a measured flow field, the change rule of the total pressure, static pressure, deflection angle, pitch angle and Mach number of the measured flow field along with time cannot be truly reflected, and the parameter distribution of a rotor outlet from a pressure surface to a suction surface cannot be measured.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the problem that the measurement means of the three-dimensional dynamic flow field between stages of the ultrasonic compressor in the prior art is lack, the invention provides a four-hole dynamic pressure probe for measuring the supersonic three-dimensional unsteady flow field, and provides a technical means for measuring the supersonic three-dimensional unsteady flow field between stages of the ultrasonic compressor in the prior art.

The technical solution of the invention is as follows:

1. a four-hole dynamic pressure probe for measuring a supersonic three-dimensional unsteady flow field is characterized in that: the dynamic pressure sensor comprises a probe head (1) and a support rod (2), wherein the probe head (1) is of a wedge-top triangular prism structure, 4 dynamic pressure sensors are arranged in the probe head, and the windward side of the probe head (1) comprises a wedge-top inclined plane (3) of the wedge-top triangular prism, a symmetrical left side surface (4) and a symmetrical right side surface (5) during probe measurement; a pressure sensing hole is formed in a wedge top inclined plane (3) of a probe head (1) and is an upper hole (6), 1 pressure sensing hole is formed in the front edge of the boundary of the left side face (4), the right side face (5) and the two side faces of the probe head (1) respectively and is a left hole (7), a right hole (8) and a middle hole (9), and the 4 pressure sensing holes which are not communicated with each other are communicated with 4 dynamic pressure sensors in the probe head (1) respectively.

2. Furthermore, the probe supporting rod (2) is of a columnar structure, can be a cylinder or a triangular prism, and is internally provided with a circular channel.

3. Furthermore, the included angle of the left side surface (4) and the right side surface (5) of the probe head (1) is 24-76 degrees.

4. Furthermore, the included angle between the front edge line of the junction of the left side surface (4) and the right side surface (5) of the probe head (1) and the wedge top inclined plane is 35-54.5 degrees.

5. Furthermore, the distance between an upper hole (6) on the wedge top inclined plane (3) and the lowest point of the wedge top inclined plane (3) is 1 mm-5 mm.

6. Furthermore, the distance between the middle hole (9) and the lowest point of the wedge top inclined plane (3) is 1 mm to 3 mm.

7. Furthermore, the central line of the hole (6) on the probe head (1), the central line of the middle hole (9), the front edge line of the boundary of the left side surface (4) and the right side surface (5) are on the same plane, the left side surface (4) and the right side surface (5) are symmetrical along the plane, the left hole (7) and the right hole (8) are symmetrically distributed along the plane, and the back surface (10) of the probe head is vertical to the plane.

8. Further, the diameters of the upper hole (6), the left hole (7), the right hole (8) and the middle hole (9) are 0.6 mm to 1.5 mm.

9. Furthermore, a cable (11) of the dynamic pressure sensor is led out from the tail part of the probe through a channel in the probe supporting rod (2).

The invention has the beneficial effects that:

compared with the existing pressure probe, the method can simultaneously measure the change of total pressure, static pressure, deflection angle, pitch angle and Mach number of the ultrasonic incoming flow along with time after calibration of the wind tunnel, and provides a means for efficiently and accurately measuring the parameters of the ultrasonic three-dimensional unsteady flow field for a turbine experiment.

Drawings

FIG. 1 is a schematic diagram of a four-hole dynamic pressure probe for measuring supersonic three-dimensional unsteady flow fields in an embodiment of the present invention.

Fig. 2 is a left side view of fig. 1.

Fig. 3 is a view from direction a of fig. 2.

Wherein: 1-probe head, 2-probe support rod, 3-wedge top inclined plane, 4-left side, 5-right side, 6-upper hole, 7-left hole, 8-right hole, 9-middle hole, 10-probe head back and 11-cable.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

As shown in fig. 1, the embodiment introduces a four-hole dynamic pressure probe for measuring a supersonic three-dimensional unsteady flow field, which comprises a probe head (1) and a support rod (2), wherein the probe head (1) is of a wedge-top triangular prism structure, the diameter of an external circle is 6 mm, the height of the probe head (1) is 30 mm, 4 dynamic pressure sensors are arranged in the probe head, and the windward side of the probe head (1) during probe measurement comprises a wedge-top inclined plane (3) of the wedge-top triangular prism, a symmetrical left side surface (4) and a symmetrical right side surface (5); a pressure sensing hole is formed in a wedge top inclined plane (3) of a probe head (1) and is an upper hole (6), 1 pressure sensing hole is formed in the front edge of the boundary of the left side face (4), the right side face (5) and the two side faces of the probe head (1) respectively and is a left hole (7), a right hole (8) and a middle hole (9), and the 4 pressure sensing holes which are not communicated with each other are communicated with 4 dynamic pressure sensors in the probe head (1) respectively.

The probe supporting rod (2) is a cylinder with the diameter of 8 mm, and a circular channel with the diameter of 5 mm is arranged in the probe supporting rod.

The included angle of the left side surface (4) and the right side surface (5) of the probe head (1) is 40 degrees.

The front edge line of the junction of the left side surface (4) and the right side surface (5) of the probe head (1) forms an included angle of 45 degrees with the wedge top inclined plane.

The distance between an upper hole (6) on the wedge top inclined plane (3) and the lowest point of the wedge top inclined plane (3) is 2 mm.

The distance between the middle hole (9) and the lowest point of the wedge top inclined plane (3) is 1 mm.

The central line of the upper hole (6) of the probe head (1), the central line of the middle hole (9), the front edge line of the boundary of the left side surface (4) and the right side surface (5) are on the same plane, the left side surface (4) and the right side surface (5) are symmetrical along the plane, the left hole (7) and the right hole (8) are symmetrically distributed along the plane, and the back surface (10) of the probe head is vertical to the plane.

The diameters of the upper hole (6), the left hole (7), the right hole (8) and the middle hole (9) are 0.6 mm.

The circle centers of the left hole (7), the right hole (8) and the middle hole (9) are on the same plane, the distance between the circle center of the left hole (7) and a front edge line of a junction of the left side face (4) and the right side face (5) is 3 millimeters, and the distance between the circle center of the right hole (8) and the front edge line of a junction of the left side face (4) and the right side face (5) is 3 millimeters.

A cable (11) of the dynamic pressure sensor passes through a channel in the probe supporting rod (2) and is led out from the tail of the probe.

The four-hole dynamic pressure probe for measuring the supersonic three-dimensional unsteady flow field introduced in the embodiment of the invention can obtain calibration data through supersonic calibration wind tunnel calibration. When the supersonic three-dimensional unsteady flow field is actually measured, the 4 dynamic pressure sensors of the four-hole dynamic pressure probe simultaneously measure unsteady pressure data sensed by the sensors, and the obtained supersonic calibration wind tunnel calibration data is utilized to process the data, so that the change of the total pressure, the static pressure, the deflection angle, the pitch angle and the Mach number of the supersonic three-dimensional unsteady incoming flow along with the time can be obtained.

Claims (2)

1. A four-hole dynamic pressure probe for measuring a supersonic three-dimensional unsteady flow field is characterized in that: the dynamic pressure sensor comprises a probe head (1) and a support rod (2), wherein the probe head (1) is of a wedge-top triangular prism structure, 4 dynamic pressure sensors are arranged in the probe head, and the windward side of the probe head (1) comprises a wedge-top inclined plane (3), a symmetrical left side surface (4) and a symmetrical right side surface (5) of the wedge-top triangular prism during probe measurement; a pressure sensing hole is arranged on the wedge top inclined plane (3) of the probe head (1) and is an upper hole (6);
1 pressure sensing holes, namely a left hole (7), a right hole (8) and a middle hole (9), are respectively formed in the front edges of the left side surface (4), the right side surface (5) and the junction of the two side surfaces of the probe head (1), and the 4 pressure sensing holes which are not communicated with each other are respectively communicated with 4 dynamic pressure sensors in the probe head (1);
the probe supporting rod (2) is of a columnar structure, and a circular channel is formed in the probe supporting rod;
the included angle of the left side surface (4) and the right side surface (5) of the probe head (1) is 76 degrees;
the included angle between the front edge line of the junction of the left side face (4) and the right side face (5) of the probe head (1) and the wedge top inclined plane is 35-54.5 degrees;
the distance between an upper hole (6) on the wedge top inclined plane (3) and the lowest point of the wedge top inclined plane (3) is 1-5 mm;
the distance between the middle hole (9) and the lowest point of the wedge top inclined plane (3) is 1 mm to 3 mm;
the central line of an upper hole (6) of the probe head (1), the central line of a middle hole (9), the front edge line of the junction of the left side surface (4) and the right side surface (5) are on the same plane, the left side surface (4) and the right side surface (5) are symmetrical along the plane, the left hole (7) and the right hole (8) are symmetrically distributed along the plane, and the back surface (10) of the probe head is vertical to the plane;
the diameters of the upper hole (6), the left hole (7), the right hole (8) and the middle hole (9) are 0.6 mm to 1.5 mm;
and a cable (11) of the dynamic pressure sensor is led out from the tail part of the probe through a channel in the probe supporting rod (2).
2. The probe of claim 1, wherein: the probe supporting rod (2) is a cylinder or a triangular prism.
CN201710134910.2A 2017-03-09 2017-03-09 Four-hole dynamic pressure probe for measuring supersonic three-dimensional unsteady flow field CN106840512B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994020014A1 (en) * 1993-03-05 1994-09-15 Sahagen Armen N Probe for monitoring a fluid medium
DE4337402A1 (en) * 1993-10-26 1995-04-27 Mannesmann Ag Probe for measuring pressure and temperature profiles
CN103884467A (en) * 2014-04-14 2014-06-25 中国科学院工程热物理研究所 Plasma pressure probe and system for measuring pressure by utilizing plasma pressure probe
CN104048808A (en) * 2013-03-14 2014-09-17 中国科学院工程热物理研究所 Dynamic entropy probe
CN106404409A (en) * 2016-11-16 2017-02-15 中国科学院工程热物理研究所 Probe assembly suitable for strong-shearing unsteady flow test of aeroengine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994020014A1 (en) * 1993-03-05 1994-09-15 Sahagen Armen N Probe for monitoring a fluid medium
DE4337402A1 (en) * 1993-10-26 1995-04-27 Mannesmann Ag Probe for measuring pressure and temperature profiles
CN104048808A (en) * 2013-03-14 2014-09-17 中国科学院工程热物理研究所 Dynamic entropy probe
CN103884467A (en) * 2014-04-14 2014-06-25 中国科学院工程热物理研究所 Plasma pressure probe and system for measuring pressure by utilizing plasma pressure probe
CN106404409A (en) * 2016-11-16 2017-02-15 中国科学院工程热物理研究所 Probe assembly suitable for strong-shearing unsteady flow test of aeroengine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
基于数字信号处理功能实现的动态探针研制;姚君;《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》;20160215(第2期);正文第4-27页 *

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