CN115436066A - Device for measuring dynamic total pressure of intake distorted flow field - Google Patents
Device for measuring dynamic total pressure of intake distorted flow field Download PDFInfo
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- CN115436066A CN115436066A CN202210874700.8A CN202210874700A CN115436066A CN 115436066 A CN115436066 A CN 115436066A CN 202210874700 A CN202210874700 A CN 202210874700A CN 115436066 A CN115436066 A CN 115436066A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention belongs to the technical field of dynamic total pressure parameter testing, and particularly relates to a device for measuring dynamic total pressure of an intake distorted flow field. The intake distortion flow field area is large, if the dynamic total pressure measurement is carried out on the intake distortion flow field area, a multi-point dynamic total pressure probe comb is generally adopted, and the traditional measurement method has the following problems: the number of probe combs is large, and the blockage of a convection field is large; (2) The probe structure of the probe comb has a small insensitive angle to the airflow direction and low frequency response; and (3) low utilization efficiency and high cost. In order to solve the problems, the invention consists of a probe comb support rod, a single-hole dynamic total pressure probe, a mounting seat and a rotating mechanism, can reduce the number of pressure sensors and the number of probe combs, weaken the interference of the probe comb support rod on a measured flow field, simplify test operation, reduce test cost, increase an insensitive angle of the probe for measurement, improve measurement frequency response, realize 360-degree all-around measurement on a certain plane of the flow field to be measured, and improve test precision.
Description
Technical Field
The invention belongs to the technical field of dynamic total pressure parameter testing, and particularly relates to a device for measuring dynamic total pressure of an intake distorted flow field.
Background
The total pressure distortion is a phenomenon that the total pressure is not uniformly distributed in the circumferential direction or the radial direction, the working performance loss of an engine can be caused, the stability problem can be caused, the severe total pressure distortion can cause the stalling or surging of a fan/a gas compressor, the engine enters an unstable working state, and even the engine is stopped in the air, so that the serious accident of the airplane can be caused; meanwhile, the total pressure distortion can bring structural damage and faults of the engine; the total pressure distortion can induce synchronous vibration response of a fan/compressor blade and a wheel disc, so that the combustion temperature field of a combustion chamber is not uniform, and the problems of early damage and the like caused by overlarge thermal stress of the turbine blade are caused;
only steady-state total pressure distortion is considered in the initial pressure distortion research, and it is gradually found that only steady-state total pressure distortion is considered insufficiently, and dynamic total pressure distortion has different influences from steady-state total pressure distortion; the pressure fluctuation causes the fluctuation of the inlet flow of the engine, thereby bringing about the loss of performance; on the other hand, due to the existence of pressure fluctuation, the actual total pressure distortion value of the dynamic peak value is larger than the steady-state total pressure distortion value, so that the influence on the stability is brought;
the intake distortion flow field area is large, if the dynamic total pressure is measured, a multi-point dynamic total pressure probe comb is generally adopted, and 6 probe combs or 8 probe combs are usually required to be arranged in a shape of a Chinese character 'mi' at equal angles in the circumferential direction; the conventional measurement method has the following problems: the number of probe combs is large, and the blockage of a convection field is large; (2) The probe structure of the probe comb has a small insensitive angle to the airflow direction and low frequency response, so that the measurement error is large; (3) The sensor adopts the connected mode of mosaic, can't demolish after the installation, if a sensor damages, can lead to whole probe comb to scrap, and the utilization efficiency is low.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: acquiring dynamic total pressure parameters of an intake distorted flow field; therefore, the invention particularly relates to a device for measuring dynamic total pressure of an intake distorted flow field, which aims to solve the defects of the traditional test method.
The design scheme of the invention is as follows:
1. a device for measuring dynamic total pressure of an intake distorted flow field consists of a probe comb supporting rod (1), a single-hole dynamic total pressure probe (2), a mounting seat (3) and a rotating mechanism (4), wherein a pressure sensor (8) is fixed on the single-hole dynamic total pressure probe (2) in a gluing mode, the single-hole dynamic total pressure probe (2) is mounted on the probe comb supporting rod (1) through a thread (7), and a probe comb is mounted on the rotating mechanism (4) through the mounting seat (3);
2. furthermore, the single-hole dynamic total pressure probe (2) is in a ball socket shape (9), and the section line of the single-hole dynamic total pressure probe is 1/4 of the circumference; the probe is provided with a small round hole (5) which can be disassembled and assembled by a special clamp; the tail part of the probe is provided with a tool withdrawal groove (6) and a thread (7) behind the tool withdrawal groove. (ii) a
3. Further, a groove (12) is formed in the rear part of the probe comb support rod (1) so as to arrange a pressure sensor cable; the front part of the device is provided with a threaded hole (13) so as to install a single-hole dynamic total pressure probe (2); the arrangement mode of the probe can be arranged according to an isotorus, and also can be arranged according to a Chebyshev integral method and a logarithmic linear method; after the single-hole dynamic total pressure probe (2) is installed, the filling material seals the groove (12) opened at the rear part, the pressure sensor cable is fixed, the air flow is ensured not to enter from the groove opened at the rear part of the probe combing rod, the influence on measurement is avoided, and the strength of the probe combing rod is enhanced.
4. Furthermore, the probe comb is fixed on the rotating mechanism (4) through four designed round holes (10) and bolts; the front part of the mounting seat is designed with a straight section (11) for positioning;
5. furthermore, the rotating mechanism (4) mainly comprises a gear transmission mechanism (14) and a motor (15), and the probe comb can rotate 360 degrees around the axis direction;
the invention can reduce the number of pressure sensors and the number of probe combs, weaken the interference of the probe comb support rods on a measured flow field, simplify test operation, reduce test cost, increase the insensitive angle of the probe for measurement, improve measurement frequency response, realize 360-degree all-around measurement on a certain plane of the measured flow field, and improve test precision.
Compared with the traditional test scheme, the invention has the beneficial effects that:
the beneficial effects are that: the insensitive angle of the total pressure probe is improved; the single-hole total pressure probe on the traditional probe comb adopts a 45-degree internal chamfer angle, the inventor compares various probe structure forms through numerical simulation and experiments, finds that the insensitive angle of the spherical socket-shaped probe is larger and can reach 50 degrees, and improves the measurement precision;
the beneficial effects are two: the frequency response of the total pressure probe is improved; the single-hole total pressure probe on the traditional probe comb generally adopts a pressure guiding pipe, or a pressure sensor is arranged at the rear part of the single-hole total pressure probe, and the installation mode causes obvious cavity effect and low measurement frequency response; according to the invention, the pressure sensor is directly arranged on the single-hole total pressure probe, a cavity between the sensor and the pressure sensing hole is small, the cavity effect is not obvious, the frequency response of the probe is high and can reach 100kHz;
the beneficial effects are three: the number of measurement points is increased; the traditional test scheme is that 6 probe combs are arranged at equal angles in a water shape or 8 probe combs are arranged at equal angles in a meter shape on a section to be measured, the method cannot be adopted, the probe combs are rotated by utilizing a rotating mechanism, and multipoint measurement is realized because a total pressure probe of the traditional probe comb is stable and is measured by a pressure-leading pipe, or a pressure sensor is arranged at the rear part of the probe, the measurement frequency response of the pressure sensor is low, a distortion flow field is dynamic, if the pressure sensor is rotated, the traditional probe comb cannot meet the measurement frequency response requirement, and the measurement result precision is very low; the invention can realize 360-degree dynamic measurement by utilizing the rotating mechanism, the number of measurement points is several times or even dozens of times of that of the traditional scheme, and the measurement precision is improved;
the beneficial effects are four: the utilization rate is high, and the test cost is reduced; the traditional probe comb adopts an integrated design, namely a probe is usually embedded on a probe comb support rod, and if one probe is damaged, the whole probe comb is scrapped; the probe is designed with small round holes and threads for disassembly, and particularly, the probe is designed on the aspect of repeated utilization and disassembly, if one probe is damaged, only a single probe needs to be processed for replacement, the processing cost of the single probe is much lower than that of the whole probe comb, the overall utilization rate is high, and the test cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a device for measuring dynamic total pressure of an intake distorted flow field.
Fig. 2 is a front view of fig. 1.
FIG. 3 is a schematic view of a single-bore dynamic pressure probe.
Fig. 4 is a sectional view of fig. 3.
Figure 5 is a schematic view of the probe comb struts of figure 3.
Fig. 6 is a rear view of fig. 5.
Wherein: 1-probe comb supporting rod, 2-single-hole dynamic total pressure probe, 3-mounting seat, 4-rotating mechanism, 5-small round hole on the probe, 6-tool withdrawal groove, 7-screw thread on the rear part of the probe, 8-pressure sensor, 9-ball socket, 10-round hole on the mounting seat, 11-straight section on the mounting seat, 12-groove on the rear part of the probe comb supporting rod, 13-threaded hole, 14-gear transmission mechanism and 15-motor.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 3 and 4, the outer diameter of the single-hole total pressure probe (2) is 5mm, and the inner diameter is 1.8mm; a small round hole (5) formed in the middle of the single-hole total pressure probe (2) is 1mm in diameter and 1mm in depth, the probe at the hole is thickened, and the outer diameter of the probe is 6mm; the length of the front part of the single-hole total pressure probe (2), namely the part in front of the tool withdrawal groove (6), is 10mm; the width of the tool withdrawal groove is 1mm, and the depth is 0.5mm; the screw thread (7) at the rear part of the single-hole total pressure probe (2) is a standard screw thread with the length of 7mm, and the screw thread is M5 multiplied by 0.5; the head part of the single-hole total pressure probe (2) is chamfered in a spherical socket shape (9), and is a 1/4 circular arc line with the radius of 1.6mm from the angle of figure 4; a pressure sensor (8) is arranged in the single-hole total pressure probe (2);
as shown in fig. 5 and 6, 6 threaded holes (13) with the depth of 7mm and the diameter of M5 multiplied by 0.5 are formed in the probe comb support rod (1), the positions of the threaded holes are arranged along a radial isotorus, and the distances from the centers of the threaded holes to the center of the bottom of the mounting seat are respectively 19.5mm, 60.5mm, 106.5mm, 160.5mm, 226.5mm and 321.5mm; the probe comb support rod (1) is a waist-shaped rod, the radial length is 330mm, the thickness is designed along the radial direction with equal strength, a groove (12) is formed in the back, the width of the groove (12) is 5mm, and the length of the groove is 310mm; the diameter of a cross section circle of the mounting seat (3) is 100mm, the thickness of the cross section circle is 6mm, round holes in the four mounting seats are distributed at equal angles, the diameter of each round hole is 10mm, the round holes penetrate through the mounting seat, and the distance between the center of each round hole (10) and the center of the mounting seat (3) is 80mm; the length of the straight section on the mounting seat (3) is 30mm;
as shown in fig. 1 and fig. 2, the rotating mechanism (4) mainly comprises a motor (14) and a gear transmission mechanism (13), wherein a single-hole total pressure probe is arranged (2) on a probe comb support rod (1), and then the whole probe is arranged on the rotating mechanism (4) to measure the dynamic total pressure of an air inlet distortion flow field of the aircraft engine;
the invention can be installed on the inner wall surface of the switching section of the air inlet passage of the aircraft engine, the probe comb is firmly installed, the structural strength is reliable, and the measurement of the dynamic total pressure of the inlet distorted flow field can be realized.
Claims (1)
1. The utility model provides a device for measuring intake distortion flow field developments are total presses which characterized in that: the probe comb is composed of a probe comb supporting rod (1), a single-hole dynamic total pressure probe (2), a mounting seat (3) and a rotating mechanism (4), wherein a pressure sensor (8) is fixed on the single-hole dynamic total pressure probe (2) in a gluing mode, the single-hole dynamic total pressure probe (2) is installed on the probe comb supporting rod (1) through a thread (7), and a probe comb is installed on the rotating mechanism (4) through the mounting seat (3);
the single-hole dynamic total pressure probe (2) is in a spherical socket shape (9), and the section profile of the probe is 1/4 of the circumference; the probe is provided with a small round hole (5) which can be disassembled and assembled by a special fixture; the tail part of the probe is provided with a tool withdrawal groove (6) and a thread (7) behind the tool withdrawal groove. (ii) a
A groove (12) is formed in the rear part of the probe comb support rod (1) so as to arrange a pressure sensor cable; the front part of the device is provided with a threaded hole (13) so as to install a single-hole dynamic total pressure probe (2); the arrangement mode of the probe can be arranged according to an isotorus, and also can be arranged according to a Chebyshev integral method and a logarithmic linear method; after the single-hole dynamic total pressure probe (2) is installed, the rear-opened groove (12) is sealed by filling materials, the pressure sensor cable is fixed, the air flow is guaranteed not to enter from the rear-opened groove of the probe comb supporting rod, the influence on measurement is avoided, and meanwhile the strength of the probe comb supporting rod is enhanced.
The probe comb is fixed on the rotating mechanism (4) through four designed round holes (10) in combination with bolts; the front part of the mounting seat is designed with a straight section (11) for positioning;
the rotating mechanism (4) mainly comprises a gear transmission mechanism (14) and a motor (15), and the probe comb can rotate 360 degrees around the axis direction;
the invention can reduce the number of pressure sensors and the number of probe combs, weaken the interference of the probe comb support rods on a measured flow field, simplify test operation, reduce test cost, increase the probe measurement insensitive angle which can reach 50 degrees, improve measurement frequency response which can reach 100kHz, realize 360-degree all-dimensional measurement on a certain plane of the flow field to be measured, and improve test precision.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210874700.8A CN115436066A (en) | 2022-07-25 | 2022-07-25 | Device for measuring dynamic total pressure of intake distorted flow field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210874700.8A CN115436066A (en) | 2022-07-25 | 2022-07-25 | Device for measuring dynamic total pressure of intake distorted flow field |
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| Publication Number | Publication Date |
|---|---|
| CN115436066A true CN115436066A (en) | 2022-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210874700.8A Pending CN115436066A (en) | 2022-07-25 | 2022-07-25 | Device for measuring dynamic total pressure of intake distorted flow field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117890063A (en) * | 2024-03-15 | 2024-04-16 | 中国空气动力研究与发展中心高速空气动力研究所 | Pressure test section design method for concurrent direct connection high-speed wind tunnel test |
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2022
- 2022-07-25 CN CN202210874700.8A patent/CN115436066A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117890063A (en) * | 2024-03-15 | 2024-04-16 | 中国空气动力研究与发展中心高速空气动力研究所 | Pressure test section design method for concurrent direct connection high-speed wind tunnel test |
| CN117890063B (en) * | 2024-03-15 | 2024-05-14 | 中国空气动力研究与发展中心高速空气动力研究所 | Pressure test section design method for concurrent direct connection high-speed wind tunnel test |
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