CN115752886A - Cylindrical four-hole pressure probe for measuring unsteady three-dimensional flow field - Google Patents
Cylindrical four-hole pressure probe for measuring unsteady three-dimensional flow field Download PDFInfo
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- CN115752886A CN115752886A CN202211340857.9A CN202211340857A CN115752886A CN 115752886 A CN115752886 A CN 115752886A CN 202211340857 A CN202211340857 A CN 202211340857A CN 115752886 A CN115752886 A CN 115752886A
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Abstract
The invention relates to a cylindrical four-hole pressure probe for measuring an unsteady three-dimensional flow field, which comprises a cylinder and an inclined plane arranged at the lower end of the cylinder, wherein three independent pressure measuring holes are formed in the position, close to the inclined plane, of the surface of the cylinder at the same height along the cylinder surface, a temperature sensing hole is formed below the middle pressure measuring hole, a lower hole serving as the pressure measuring hole is formed in the inclined plane, four pressure guide channels for mounting a micro pressure sensor are arranged in the cylinder along the circumference, a temperature sensor channel for mounting a temperature sensor is formed in the middle of the cylinder, the four pressure guide channels are respectively communicated with the four pressure measuring holes, and the temperature sensor channel is communicated with the temperature sensing hole. Compared with the existing pressure probe, the invention can directly install the miniature pressure sensor in the pressure guide channel, reduce the length and the volume of the pressure transmission pipe cavity of the probe, eliminate the influence of the damping action on the measurement of high-frequency pulsating pressure and provide a reliable method for the test of the unsteady three-dimensional flow field between the turbine and the compressor stages of the gas turbine.
Description
Technical Field
The invention relates to a test probe for an internal flow field of a gas turbine, in particular to a cylindrical four-hole pressure probe which is suitable for measuring unstable three-dimensional flow field parameters such as total pressure, static pressure, deflection angle, pitch angle, speed and the like of an interstage of a turbine and a gas compressor of the gas turbine.
Background
Reliable flow field measurements of turbine and compressor cascades are critical to 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 higher harmonics of the blade passing frequency, which can be as high as 5-20 kHz. The common long pressure transmission pipe probe scheme is difficult to obtain accurate three-dimensional flow field information.
Disclosure of Invention
The invention aims to solve the problems that: the cylindrical four-hole pressure probe for measuring the unsteady three-dimensional flow field is excellent in performance, the miniature pressure sensor can be directly installed in a pressure guide channel, the length and the volume of a probe pressure transmission pipe cavity are reduced, the influence of the damping effect on high-frequency pulsating pressure measurement is eliminated, and the miniature pressure sensor can be applied to the unsteady three-dimensional flow field test between a turbine and a compressor interstage of a gas turbine to obtain the parameters such as total pressure, static pressure, deflection angle, pitch angle, speed and the like.
In order to realize the purpose, the technical scheme of the invention is as follows: the utility model provides a measure cylindrical four-hole pressure probe in three-dimensional flow field of unsteady state, includes the inclined plane that cylinder, cylinder lower extreme set up, sets up three independent pressure measurement hole along the face of cylinder at the cylinder surface same height of nearly inclined plane position, sets up a temperature-sensing hole below the pressure measurement hole of centre, and inclined plane department opens and sets up down the hole as the pressure measurement hole, be equipped with four pressure channels of leading that are used for installing miniature pressure sensor along the circumference in the cylinder, the centre is equipped with the temperature sensor passageway that is used for installing temperature sensor, and four pressure channels of leading communicate four pressure measurement holes respectively, and the temperature sensor passageway communicates the temperature-sensing hole.
Further, the diameter of the cylinder is 5 mm to 5.8 mm, the length is 35 mm to 45 mm, and the inclined angle of the inclined plane is 40 degrees to 50 degrees.
Furthermore, the three independent pressure measuring holes are located at the same height, wherein the right hole and the left hole are respectively located at two sides of the middle hole, and the included angle is 110-130 degrees.
Furthermore, the mesopore is positioned on the cylindrical surface near the inclined plane, the distance between the mesopore and the lower edge of the inclined plane is 12.5 mm to 17.5 mm, the diameter of the mesopore is 0.2 mm to 0.4 mm, and the axis of the mesopore is vertical to the cylindrical surface and is communicated with the mesopore pressure guide channel.
Furthermore, the axis of the lower hole is perpendicular to the inclined plane, is in a vertical position with the middle hole, has a diameter of 0.2 mm to 0.4 mm, and is communicated with the lower hole pressure guide channel.
Furthermore, the diameters of the right hole and the left hole are 0.2 mm to 0.4 mm, the included angles of 25 degrees to 35 degrees are formed between the diameters and the cross section of the cylinder, and the diameters are respectively communicated with the right hole pressure guide channel and the left hole pressure guide channel.
Further, the diameter of the pressure guide 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.
The invention has the beneficial effects that:
compared with the existing pressure probe, the invention can directly install the miniature pressure sensor in the pressure guide channel, reduce the length and the volume of the pressure transmission pipe cavity of the probe, eliminate the influence of the damping action on the measurement of high-frequency pulsating pressure and provide a reliable method for the test of the unsteady three-dimensional flow field between the turbine and the compressor stages of the gas turbine.
Drawings
FIG. 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;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a right side view of FIG. 1;
in the figure: 1-cylinder, 2-slope, 3-mesopore, 4-right pore, 5-left pore, 6-lower pore, 7-temperature sensing pore, 8-mesopore pressure guide channel, 9-right pore pressure guide channel, 10-left pore pressure guide channel, 11-lower pore pressure guide channel and 12-temperature sensor channel.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1 to 3, the cylindrical four-hole pressure probe for measuring an unsteady three-dimensional flow field in this embodiment includes a cylinder 1 and an inclined plane 2 disposed at a lower end of the cylinder 1, three independent pressure measurement holes, namely a middle hole 3, a right hole 4, and a left hole 5, are disposed on the same height of the surface of the cylinder 1 near the inclined plane 2 along the surface of the cylinder 1, a temperature sensing hole 7 is further disposed below the middle hole 3, and a lower hole 6 for measuring pressure is disposed at the inclined plane 2. Four pressure guide channels used for installing a miniature pressure sensor are arranged along the circumference in the cylinder 1, namely a middle hole pressure guide channel 8, a right hole pressure guide channel 9, a left hole pressure guide channel 10 and a lower hole pressure guide channel 11, a temperature sensor channel 12 used for installing a temperature sensor is arranged in the middle, the four pressure guide channels are respectively communicated with four pressure measuring holes, and the temperature sensor channel 12 is communicated with a temperature sensing hole 7.
Preferably, the cylinder 1 has a diameter of 5 mm to 5.8 mm and a length of 35 mm to 45 mm, and has a slope 2 at one end, the slope being inclined at an angle of 40 ° to 50 °.
Preferably, the cylinder 1 has a diameter of 5.4 mm and a length of 40 mm, and has a bevel 2 at one end, the bevel being inclined at an angle of 45 °.
Preferably, the mesopore 3 is positioned on the surface of the cylinder 1 near the inclined plane 2 and is 12.5 mm to 17.5 mm away from the lower edge of the inclined plane, the axis of the mesopore 3 is vertical to the surface of the cylinder, and the diameter of the mesopore is 0.2 mm to 0.4 mm and is communicated with the mesopore pressure guide channel 8.
Preferably, the mesopore 3 is positioned on the surface of the cylinder 1 near the inclined plane 2 and is separated from the lower edge of the inclined plane by 125 mm, the axis of the mesopore 3 is vertical to the surface of the cylinder, and the diameter of the mesopore is 0.3 mm and is communicated with the mesopore pressure guide channel 8.
Preferably, the axis of the lower hole 6 is perpendicular to the inclined plane 2, is in a vertical position with the central hole 5, has a diameter of 0.2 mm to 0.4 mm and is communicated with the lower hole pressure guide channel 11.
Preferably, the axis of the lower hole 6 is perpendicular to the inclined plane 2, is in a vertical position with the central hole 5, has a diameter of 0.3 mm and is communicated with the lower hole pressure guide channel 11.
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 arranged at two sides of the middle hole 3, and the included angle is 110-130 degrees.
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 arranged at two sides of the middle hole 3 with an included angle of 120 °.
Preferably, the diameter of the right hole 4 and the left hole 5 is 0.2 mm to 0.4 mm, and the right hole and the left hole form an included angle of 25 degrees to 35 degrees with the cross section of the cylinder 1 and are respectively communicated with the right hole pressure guide channel 9 and the left hole pressure guide channel 10.
Preferably, the diameter of the right hole 4 and the left hole 5 is 0.3 mm, and the right hole and the left hole form an included angle of 30 degrees with the cross section of the cylinder 1 and are respectively communicated with the right hole pressure guide channel 9 and the left hole pressure guide channel 10.
Preferably, there is a temperature sensing hole 7 below the middle hole 3.
Preferably, the end face of the cylinder 1 is provided with a middle hole pressure guide channel 8, a right hole pressure guide channel 9, a left hole pressure guide channel 10 and a lower hole pressure guide channel 11, the diameter is 1.4 mm to 1.8 mm, and the diameter of the temperature sensor channel 12 is 0.6 mm to 1.0 mm.
Preferably, the end surface of the cylinder 1 is provided with a middle hole pressure guide channel 8, a right hole pressure guide channel 9, a left hole pressure guide channel 10 and a lower hole pressure guide channel 11, the diameter of the middle hole pressure guide channel is 1.6 mm, and the diameter of the temperature sensor channel 12 is 0.8 mm.
The cylindrical four-hole pressure probe for measuring the unsteady three-dimensional flow field introduced by the example of the invention can directly install the miniature pressure sensor in the pressure guide channel, reduce the length and the volume of a pressure transmission pipe cavity of the probe, eliminate the influence of the damping action on the measurement of the high-frequency pulsating pressure, and is applied to the testing of the unsteady three-dimensional flow field between the turbine and the compressor stages of the gas turbine.
Claims (7)
1. A cylindrical four-hole pressure probe for measuring an unsteady three-dimensional flow field is characterized in that: including the inclined plane that cylinder, cylinder lower extreme set up, set up three independent pressure cell along the face of cylinder at the cylinder surface co-altitude of nearly inclined plane position, set up a temperature-sensing hole below the pressure cell of centre, inclined plane department sets up down the hole as the pressure cell, be equipped with four pressure channels of leading that are used for installing miniature pressure sensor along the circumference in the cylinder, the centre is equipped with the temperature sensor passageway that is used for installing temperature sensor, and four lead and press the passageway and communicate four pressure cells respectively, temperature sensor passageway intercommunication temperature-sensing hole.
2. The cylindrical four-hole pressure probe for measuring an unsteady three-dimensional flow field according to claim 1, characterized in that: the diameter of the cylinder is 5 mm to 5.8 mm, the length of the cylinder is 35 mm to 45 mm, and the inclined angle of the inclined plane is 40 degrees to 50 degrees.
3. The cylindrical four-hole pressure probe for measuring an unsteady three-dimensional flow field according to claim 1, characterized in that: the three independent pressure measuring holes are located at the same height, wherein the right hole and the left hole are respectively located at two sides of the middle hole, and the included angle is 110-130 degrees.
4. The cylindrical four-hole pressure probe for measuring an unsteady three-dimensional flow field according to claim 3, characterized in that: the middle hole is positioned on the cylindrical surface close to the inclined plane, the distance between the middle hole and the lower edge of the inclined plane is 12.5 mm to 17.5 mm, the diameter of the middle hole is 0.2 mm to 0.4 mm, and the axis of the middle hole is vertical to the cylindrical surface and is communicated with the middle hole pressure guide channel.
5. The cylindrical four-hole pressure probe for measuring an unsteady three-dimensional flow field according to claim 3, characterized in that: the diameters of the right hole and the left hole are 0.2 mm to 0.4 mm, the right hole and the left hole form an included angle of 25 degrees to 35 degrees with the cross section of the cylinder, and the right hole and the left hole are respectively communicated with the right hole pressure guide channel and the left hole pressure guide channel.
6. The cylindrical four-hole pressure probe for measuring an unsteady three-dimensional flow field according to claim 1, characterized in that: the axis of the lower hole is perpendicular to the inclined plane, is in the vertical position with the middle hole, has the diameter of 0.2 mm to 0.4 mm, and is communicated with the lower hole pressure guide channel.
7. The cylindrical four-hole pressure probe for measuring an unsteady three-dimensional flow field according to claim 1, characterized in that: the diameter of the pressure guide 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211340857.9A CN115752886A (en) | 2022-10-29 | 2022-10-29 | Cylindrical four-hole pressure probe for measuring unsteady three-dimensional flow field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211340857.9A CN115752886A (en) | 2022-10-29 | 2022-10-29 | Cylindrical four-hole pressure probe for measuring unsteady three-dimensional flow field |
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| CN115752886A true CN115752886A (en) | 2023-03-07 |
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| CN202211340857.9A Pending CN115752886A (en) | 2022-10-29 | 2022-10-29 | Cylindrical four-hole pressure probe for measuring unsteady three-dimensional flow field |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106885680A (en) * | 2017-03-01 | 2017-06-23 | 北京航空航天大学 | A kind of hole dynamic pressure probe of wedge head four for measuring subsonic speed three dimensional unsteady flow |
| CN106989896A (en) * | 2017-04-17 | 2017-07-28 | 北京航空航天大学 | A kind of dynamic temperature force combination probe for measuring subsonics three-dimensional non-steady flow field |
| CN212082824U (en) * | 2020-01-20 | 2020-12-04 | 北京航空航天大学 | Probe for measuring whole parameters of transonic three-dimensional steady-state flow field |
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2022
- 2022-10-29 CN CN202211340857.9A patent/CN115752886A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106885680A (en) * | 2017-03-01 | 2017-06-23 | 北京航空航天大学 | A kind of hole dynamic pressure probe of wedge head four for measuring subsonic speed three dimensional unsteady flow |
| CN106989896A (en) * | 2017-04-17 | 2017-07-28 | 北京航空航天大学 | A kind of dynamic temperature force combination probe for measuring subsonics three-dimensional non-steady flow field |
| CN212082824U (en) * | 2020-01-20 | 2020-12-04 | 北京航空航天大学 | Probe for measuring whole parameters of transonic three-dimensional steady-state flow field |
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