CN218331614U - Splayed hot wire probe for measuring interstage two-dimensional velocity field of gas compressor - Google Patents
Splayed hot wire probe for measuring interstage two-dimensional velocity field of gas compressor Download PDFInfo
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- CN218331614U CN218331614U CN202222356155.1U CN202222356155U CN218331614U CN 218331614 U CN218331614 U CN 218331614U CN 202222356155 U CN202222356155 U CN 202222356155U CN 218331614 U CN218331614 U CN 218331614U
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Abstract
The invention belongs to the technical field of subsonic two-dimensional flow field parameter testing, and particularly relates to an eight-shaped hot wire probe for measuring an interstage two-dimensional velocity field of a gas compressor. The probe comprises a probe head, a probe supporting rod, a hot wire and a positioning block, wherein two long fork rods and two short fork rods which are distributed in a trapezoidal mode are arranged on the probe head, the hot wire is welded between each long fork rod and the corresponding short fork rod, the fork rods are connected with a cable through a through hole in the probe head, the cable leads out the probe tail through a channel in the probe supporting rod, and the positioning block is sleeved on the probe tail. The two hot wires are in a splayed shape when viewed along the incoming flow direction, the interference on the hot wires is small, the whole probe is in a shape of a | and the change of the interstage two-dimensional speed of the multi-stage compressor along with the time can be measured through calibrating the wind tunnel, the test frequency can reach dozens of kilohertz, and the measured data basis is provided for improving the performance of the compressor.
Description
Technical Field
The invention belongs to the technical field of subsonic two-dimensional flow field parameter testing, and particularly relates to an eight-shaped hot wire probe for measuring a two-dimensional velocity field between stages of a gas compressor, which is suitable for measuring the change of the two-dimensional velocity between stages of the multistage gas compressor along with time, and the frequency response of the probe can reach dozens of kilohertz.
Background
The method has the advantages that the two-dimensional unsteady speed field between stages of the multistage compressor is obtained, and the method has an important effect on improving the performance of the compressor. The interstage flow field is influenced by the sweep of the wake of the movable blade, leakage vortex, angular vortex and other secondary flows, so that the flow field has strong non-stationarity and rotation; in addition, the interstage clearance of the multi-stage compressor is relatively small, and especially the interstage clearance of the later stage is smaller.
The principle of hot wire speed measurement is as follows: the hot wire is placed in the air flow, the heat of the hot wire is taken away by the air flow due to heat exchange, so that the temperature of the hot wire changes, the size and the speed of the temperature change mainly depend on the speed of the air flow, the temperature difference between the hot wire and the air flow, the physical property of the gas and the physical property and the geometric dimension of the wire, generally, the last three items can be known in advance or are given artificially, and therefore, a corresponding relation can be established between the temperature of the hot wire and the speed of the air flow. The resistance of the hot wire changes with temperature, and the output voltage and the incoming current speed keep a specific relation.
For the measurement of two-dimensional velocity fields, it is conventional to use a "X" -type twin wire probe, which can measure two instantaneous velocities (u and v) in the plane of the two hot wires, which are very close together, as shown in fig. 1. The main problem with the use of "X" type probes between compressor stages is, firstly, that the measured u and v do not match the axial and circumferential speeds of interest, and as shown in figure 2, to match u and v with the axial and axial speeds of interest requires the probe head to be "L" shaped, which is difficult to measure by inserting an "L" shaped probe between the compressor rotor and stator due to size. Second, when the "X" type twin wire probe is used, the hot wire is affected by the trail of the fork. When the hot wire is used, in order to ensure high frequency response, a larger overheating ratio is selected, the overheating temperature rise is over 200 ℃ compared with the temperature of the air flow, when the distance between the two hot wires is too close, the temperature of the air flow after flowing through the hot wires is rapidly increased, the downstream hot wires are interfered, the condition is particularly obvious when an included angle exists between the air flow and a plane where the two hot wires are located, as shown in fig. 2, when the circumferential speed exists, the relation between the output voltage of the hot wire and the incoming flow speed is complex, and the speed cannot be accurately measured. Thirdly, the existing 'X' -shaped twin-wire probe is mostly in a plug-in type, although the replacement is convenient, the interstage flow field of the gas compressor faces serious strength problems, particularly for a transonic gas compressor, the gas flow speed of the transonic gas compressor is high, the probe can be impacted by the high speed of the gas flow, and the hot wire probe cannot be used in the region due to safety considerations. Fourth, the existing "X" type double-filament probe lacks a positioning device and is difficult to position when in use.
The two-dimensional speed field of the compressor interstage has high change speed and narrow measurement space, the existing X-shaped twin-wire probe has strength problem when being used in the compressor interstage, is difficult to insert into the compressor interstage, and has unreliable measurement result and difficult positioning. Therefore, the development of a hot wire probe which is accurate, reliable, applied in a narrow space, high in strength and simple in positioning and is used for measuring the two-dimensional velocity field between compressor stages is urgently needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the splayed hot wire probe for measuring the interstage two-dimensional velocity field of the compressor, the whole probe is I-shaped, the size is small, the probe can be directly inserted into a rotating chamber for measurement, two hot wires are splayed when viewed along the incoming flow direction, the probe is sensitive to deflection of a main flow, the two-dimensional velocity can be calculated in principle, the calibration can be carried out when the probe is actually applied, the hot wires are not influenced by a fork rod due to the arrangement, the mutual interference among the hot wires can be avoided, the accurate measurement can be realized, the head part of the probe is connected with a probe support rod through threads, the strength is reliable, and the probe support rod has a positioning function.
The technical solution of the invention is as follows:
1. the utility model provides a measure "eight" style of calligraphy hot wire probe in compressor interstage two-dimensional velocity field, comprises probe head (1), probe branch (2), hot wire (3), long fork arm (4), short fork arm (5), cable (7), locating piece (9), its characterized in that: the probe head (1) is cylindrical, the top end of the cylinder extends out of the long fork rod (4) and the short fork rod (5) and is provided with two hot wires (3), and the two hot wires (3) are welded between the long fork rod (4) and the adjacent short fork rod (5) and are in a splayed shape when viewed along the incoming flow direction.
2. Furthermore, the diameter of the hot wire (3) is 1 micron to 30 microns, the length is 1 millimeter to 10 millimeters, the material is tungsten wire, platinum wire or gold-plated tungsten wire, the included angle between the hot wire (3) and the long fork rod (4) is theta, and the value range of theta is more than or equal to 5 degrees and less than or equal to 85 degrees.
3. Furthermore, the long fork rod (4) is conical, the diameter of the head of the long fork rod is 0.1 mm to 0.3 mm, the length of the long fork rod (4) exposed out of the probe head (1) is 1 mm to 30 mm, the arrangement mode of the long fork rod (4) and the short fork rod (5) on the probe head (1) is an isosceles trapezoid, the height of the isosceles trapezoid is 0.5 mm to 8 mm, the acute angle of the isosceles trapezoid is alpha, the value range is more than or equal to 5 degrees and less than or equal to 85 degrees, the short fork rod (5) is arranged in front of the long fork rod (4), and the hot wire long fork rod (4) is made of stainless steel.
4. Furthermore, the short fork rod (5) is conical, the diameter of the head of the short fork rod is 0.1 mm to 0.3 mm, the length of the short fork rod (5) exposed out of the probe head (1) is 0.5 mm to 30 mm, the short fork rod (5) is shorter than the long fork rod (4) by h, the value range is that h is more than or equal to 0.5 mm and less than or equal to 30 mm, and the short fork rod (5) is made of stainless steel.
5. Furthermore, the probe head part (1) is cylindrical, the diameter is d, the value range of d is more than or equal to 2 mm and less than or equal to 10 mm, the length is 4d to 8d, and a probe head part through hole (6) is formed in the probe head part (1).
6. Furthermore, the long fork rod (4) and the short fork rod (5) are connected with the cable (7) through the probe head through hole (6), and the long fork rod (4) and the short fork rod (5) are fixed and insulated from the probe head (1) through the insulating glue (8).
7. Furthermore, the probe supporting rod (2) is a cylinder, the diameter of the probe supporting rod is D, the value range is that D is not less than 2 millimeters and not more than 10 millimeters, a circular pipeline is arranged in the probe supporting rod, the probe head (1) is connected with the probe supporting rod (2) through threads, the cable (6) leads out the probe tail through the pipeline in the probe supporting rod (2), and the probe tail is sleeved with a cuboid positioning block (9).
8. Furthermore, a cuboid positioning block (9) is sleeved at the tail of the probe through a positioning block through hole (10), a countersunk screw (12) penetrates through threaded holes (11) on two sides of the cuboid positioning block (9) to be fixed, and the countersunk screw (12) is completely embedded into the threaded holes (11).
9. Furthermore, 4 side faces of the cuboid positioning block (9) can be used as positioning faces, the diameter of a through hole of the positioning block is D +0.05 mm, the bottom face of the cuboid positioning block (9) is square, the side length of the square is M, the value range is D +2 mm or less and M or less and D +8 mm or less, the thickness of the cuboid positioning block (9) is H, and the value range is 2 mm or less and H or less and 5 mm or less.
The invention has the beneficial effects that:
compared with the existing X-shaped double-wire probe, the splayed hot wire probe for measuring the interstage two-dimensional velocity field of the compressor has the following beneficial effects:
the beneficial effects are as follows: the arrangement mode of the fork bars on the probe head is isosceles trapezoid, the short fork bar is arranged in front of the long fork bar, and the two hot wires are in a splayed shape in the incoming flow direction. Because the short fork rod is in the front, the tail track of the short fork rod cannot influence the hot wire. The two hot wires are in a splayed shape, and the interference between the hot wires can be ignored. At this time, the output voltage of the hot wire is only related to the incoming flow speed, and the measurement result is more accurate.
The beneficial effects are two: the whole probe is I-shaped, and is smaller than an L-shaped probe in size, on one hand, the probe can be inserted into a multi-stage compressor to be measured in a static rotation mode, interference on a measured flow field is small, and on the other hand, the probe has higher spatial resolution.
The beneficial effects are three: the fork arm passes probe head through-hole to realize the fixed of fork arm and probe head and insulating with the insulating cement, the probe structure is simpler, and insulating nature and leakproofness are good. The probe head is connected with the probe support rod through threads, so that the probe is high in strength and more suitable for being used between compressor stages with high air flow speed.
The beneficial effects are four: the positioning block adopted by the invention has small size, has small influence on the probe in the measuring process, and is simple and convenient in the positioning process and more suitable for practical engineering application because four side surfaces of the positioning block can be used as positioning surfaces and can be replaced mutually.
Drawings
FIG. 1 is an "X" -type double-filament probe.
FIG. 2 is a test layout of an "X" type twin wire probe.
Fig. 3 is a schematic structural diagram of the present invention.
Fig. 4 is a right side view of fig. 3.
Fig. 5 is a partially enlarged view of fig. 4.
Wherein: 1-probe head, 2-probe supporting rod, 3-hot wire, 4-long fork rod, 5-short fork rod, 6-probe head through hole, 7-cable, 8-insulating glue, 9-cuboid positioning block, 10-positioning block through hole, 11-threaded hole and 12-countersunk head screw.
Detailed Description
As shown in figure 3, a high frequency hot wire probe of "eight" style of calligraphy of measuring compressor interstage two-dimensional velocity field comprises probe head (1), probe branch (2), hot wire (3), long fork arm (4), short fork arm (5), cable (7), cuboid locating piece (9), its characterized in that: the probe head (1) is cylindrical, the top end of the cylinder extends out of the long fork rod (4) and the short fork rod (5), two hot wires (3) are welded between the long fork rod (4) and the adjacent short fork rod (5), and the two hot wires (3) are in a splayed shape when viewed along the incoming flow direction;
the diameter of the hot wire (3) is 10 micrometers, the length of the hot wire is 3 millimeters, and the material is gold-plated tungsten wires. The included angle between the hot wire (3) and the long fork rod (4) is 45 degrees;
the long fork rod (4) is conical, the diameter of the head of the long fork rod is 0.2 mm, the length of the long fork rod (4) exposed out of the probe head (1) is 6 mm, the arrangement mode of the long fork rod (4) and the short fork rod (5) on the probe head (1) is an isosceles trapezoid, the acute angle of the isosceles trapezoid is 45 degrees, the short fork rod (5) is in front of the long fork rod (4), and as shown in figure 4, the hot-line long fork rod (4) is made of stainless steel;
the short fork rod (5) is conical, the diameter of the head of the short fork rod is 0.2 mm, the length of the short fork rod (5) exposed out of the probe head (1) is 4 mm, the short fork rod (5) is 2 mm shorter than the long fork rod (4), and the short fork rod (5) is made of stainless steel;
the probe head (1) is cylindrical, the diameter of the probe head is 4 mm, the length of the probe head is 20 mm, and a probe head through hole (7) is formed in the probe head (1);
the long fork rod (4) and the short fork rod (5) are connected with a cable (7) through a probe head through hole (6), and the long fork rod (4) and the short fork rod (5) are fixed and insulated with the probe head (1) through insulating glue (8);
the probe supporting rod (2) is a cylinder, the diameter of the probe supporting rod is 4 mm, a circular pipeline is arranged in the probe supporting rod, the head part (1) of the probe is connected with the probe supporting rod (2) through threads, a cable (7) is led out of the tail part of the probe through the pipeline in the probe supporting rod (2), and the tail part of the probe is sleeved with a cuboid positioning block (9);
a cuboid positioning block (9) is sleeved at the tail of the probe through a positioning block through hole (10), a countersunk screw (12) penetrates through threaded holes (11) at two sides of the cuboid positioning block (9) for fixation, and the countersunk screw (12) is completely embedded into the threaded holes (11) as shown in figure 5;
4 side surfaces of the cuboid positioning block (10) can be used as positioning surfaces, the diameter of a through hole of the positioning block is 4.05 mm, the bottom surface of the cuboid positioning block (9) is square, the side length of the bottom surface is 10 mm, and the thickness of the cuboid positioning block (9) is 5 mm;
before the calibration wind tunnel is used, the probe is calibrated in the calibration wind tunnel, one side face of a cuboid positioning block (9) is selected as a positioning face, the relative position of the positioning face of the cuboid positioning block (9) and a hot wire (3) is determined through a level gauge, the cuboid positioning block (9) is fixed through a countersunk screw (12), and the pneumatic calibration coefficient of the hot wire probe is obtained in different incoming flow directions and different speeds. When the interstage measurement of the compressor is carried out, the magnitude and the direction of the incoming flow are calculated back by utilizing the measurement data through the hot wire probe pneumatic calibration coefficient.
Claims (1)
1. The utility model provides a measure "eight" style of calligraphy hot wire probe in compressor interstage two-dimensional velocity field, comprises probe head (1), probe branch (2), hot wire (3), long fork arm (4), short fork arm (5), cable (7), locating piece (9), its characterized in that: the probe head (1) is cylindrical, the top end of the cylinder extends out of the long fork rod (4) and the short fork rod (5), two hot wires (3) are welded between the long fork rod (4) and the adjacent short fork rod (5), and the two hot wires (3) are in a splayed shape when viewed along the incoming flow direction;
the diameter of the hot wire (3) is 1-30 micrometers, the length of the hot wire is 1-10 millimeters, the hot wire is made of tungsten wires, platinum wires or gold-plated tungsten wires, the included angle between the hot wire (3) and the long fork rod (4) is theta, and the value range of theta is more than or equal to 5 degrees and less than or equal to 85 degrees;
the long fork rod (4) is conical, the diameter of the head of the long fork rod is 0.1 mm to 0.3 mm, the length of the long fork rod (4) exposed out of the probe head (1) is 1 mm to 30 mm, the arrangement mode of the long fork rod (4) and the short fork rod (5) on the probe head (1) is isosceles trapezoid, the height of the isosceles trapezoid is 0.5 mm to 8 mm, the acute angle of the isosceles trapezoid is alpha, the value range is more than or equal to 5 degrees and less than or equal to 85 degrees, the short fork rod (5) is arranged in front of the long fork rod (4), and the material of the hot wire long fork rod (4) is stainless steel;
the short fork rod (5) is conical, the diameter of the head of the short fork rod is 0.1 mm to 0.3 mm, the length of the short fork rod (5) exposed out of the probe head (1) is 0.5 mm to 30 mm, the short fork rod (5) is shorter than the long fork rod (4) by h, the value range is that h is more than or equal to 0.5 mm and less than or equal to 30 mm, and the short fork rod (5) is made of stainless steel;
the probe head part (1) is cylindrical, the diameter is d, the value range of d is more than or equal to 2 mm and less than or equal to 10 mm, the length is 4d to 8d, and a probe head part through hole (6) is formed in the probe head part (1);
the long fork rod (4) and the short fork rod (5) are connected with a cable (7) through a probe head through hole (6), and the long fork rod (4) and the short fork rod (5) are fixed and insulated with the probe head (1) through insulating glue (8);
the probe supporting rod (2) is a cylinder, the diameter of the probe supporting rod is D, the value range of D is more than or equal to 2 mm and less than or equal to 10 mm, a circular pipeline is arranged in the probe supporting rod, the head part (1) of the probe is connected with the probe supporting rod (2) through threads, a cable (7) is led out of the tail part of the probe through the pipeline in the probe supporting rod (2), and a cuboid positioning block (9) is sleeved on the tail part of the probe;
a cuboid positioning block (9) is sleeved at the tail of the probe through a positioning block through hole (10), a countersunk screw (12) penetrates through threaded holes (11) at two sides of the cuboid positioning block (9) to be fixed, and the countersunk screw (12) is completely embedded into the threaded holes (11);
4 sides of the cuboid positioning block (9) can be used as positioning surfaces, the diameter of a through hole of the positioning block is D +0.05 mm, the bottom surface of the cuboid positioning block (9) is square, the side length of the square is M, the value range is D +2 mm or less and is not more than D +8 mm, the thickness of the cuboid positioning block (9) is H, and the value range is 2 mm or less and is not more than H or not more than 5 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222356155.1U CN218331614U (en) | 2022-09-06 | 2022-09-06 | Splayed hot wire probe for measuring interstage two-dimensional velocity field of gas compressor |
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| CN202222356155.1U CN218331614U (en) | 2022-09-06 | 2022-09-06 | Splayed hot wire probe for measuring interstage two-dimensional velocity field of gas compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115436656A (en) * | 2022-09-06 | 2022-12-06 | 北京航空航天大学 | Splayed hot wire probe for measuring interstage two-dimensional velocity field of gas compressor |
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- 2022-09-06 CN CN202222356155.1U patent/CN218331614U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115436656A (en) * | 2022-09-06 | 2022-12-06 | 北京航空航天大学 | Splayed hot wire probe for measuring interstage two-dimensional velocity field of gas compressor |
| CN115436656B (en) * | 2022-09-06 | 2024-05-21 | 北京航空航天大学 | Eight-shaped hot wire probe for measuring two-dimensional velocity field between stages of compressor |
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