CN105588703A - 12-hole omni-directional probe for subsonic-speed and complex three-dimensional flow field measurement - Google Patents
12-hole omni-directional probe for subsonic-speed and complex three-dimensional flow field measurement Download PDFInfo
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- CN105588703A CN105588703A CN201510937312.XA CN201510937312A CN105588703A CN 105588703 A CN105588703 A CN 105588703A CN 201510937312 A CN201510937312 A CN 201510937312A CN 105588703 A CN105588703 A CN 105588703A
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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
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
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Abstract
The invention discloses a 12-hole omni-directional probe for the subsonic-speed and complex three-dimensional flow field measurement. The 12-hole omni-directional probe comprises a pressure measuring head 1, a pressure measuring rod, an installation base 5, a positioning ring 6, a pressure measuring pipe 7 and a pressure mouthpiece 8. The pressure measuring rod is of a hollow structure and is composed of a first strut 3, a second strut 3 and a third strut 4. The pressure measuring head 1 is of a spherical structure and the diameter of the spherical structure is 5-30 mm. The spherical structure is machined through the electric spark molding step or the electrolytic molding step. 12 pressure measuring holes are arranged at 12 vertexes of a regular icosahedron in internal connection with the pressure measuring head 1. One end of the pressure measuring pipe 7 is connected with the pressure mouthpiece 8. The other end of the pressure measuring pipe 7 is connected with the pressure measuring head 1 after passing through the pressure measuring pipe 7. The pressure measuring head 1, the pressure measuring rod and the pressure measuring pipe 7 are connected together through the silver-based brazing process. One end of the pressure mouthpiece 8 is connected with the pressure measuring pipe 7. The other end of the pressure mouthpiece 8 is connected with a rear-end pressure scanning element so as to convert pressure signals into electric signals.
Description
Technical field:
The invention belongs to subsonic speed flow field field tests, be specifically related to a kind of 12 hole omnidirectional probes for subsonic speed complex three-dimensional flow field survey.
Background technology:
In the measurement in air force flow field, should measure the size of flow velocity, determine again the direction of flow velocity, as near complex flowfield free jet test, the survey of Flow Field in Wind Tunnel quality school, aero-engine altitude simulation test, turbine blade of gas turbine trailing edge and airfoil type etc.
At present, for the measurement of flow field velocity and deflection, the more of use is five-hole probe and seven-hole probe. The maximum air-flow angle of measuring of five-hole probe and seven-hole probe depends on pressure-measuring head geometry and pressure tap position distribution, and air-flow angle that can Measurement accuracy can reach 70 degree. For the flow field of a lot of complexity, as tail district or the recirculation zone of non-streamline object, the angular range that airflow direction angle (150 ° of left and right) can be measured much larger than five-hole probe and seven-hole probe.
Other flow-field test equipment, as LDV (LDV) and particle imaging tachymeter (PIV) etc., apparatus expensive, using method complexity, has relatively high expectations to environment for use, realizes difficulty large for the flow field survey of a lot of complexity.
Summary of the invention:
Goal of the invention:
The subsonic speed 12 hole omnidirectional probes that project organization is simple and reliable, for the measurement of complicated subsonic speed three-dimensional flow field medium velocity, deflection and total static pressure, mainly comprise wind tunnel test, Aero Engine Testing and other occasions of testing for subsonic speed flow field, realize the omnirange angular surveying in complex three-dimensional flow field.
The present invention realizes the scheme of above-mentioned purpose:
For 12 hole omnidirectional probes of subsonic speed complex three-dimensional flow field survey, comprise that pressure-measuring head (1), pressure measuring rod, mount pad (5), locating ring (6), pressure-measuring pipe (7), pressure connect mouth (8); Wherein, pressure measuring rod is hollow-core construction, comprises the first pole (2), the second pole (3), the 3rd pole (4); Pressure-measuring head (1) is sphere structure, pressure-measuring head (1) diameter is 5mm～30mm, through electric spark or electrolytic formation processing, on pressure-measuring head (1), be distributed with 12 pressure taps, pressure tap is positioned on 12 summits of positive 20 bodies that connect with pressure-measuring head (1); Pressure-measuring head (1) diameter is 20～40 with pressure tap diameter ratio; The diameter ratio of pressure-measuring head (1) diameter and the first pole (2) is 2～5; The length ratio of pressure-measuring head diameter and the first pole (2) is 1～3; Pressure-measuring pipe (7) one end connects mouth (8) with pressure and is connected, the other end is connected with pressure-measuring head (1) through pressure-measuring pipe (7), between pressure-measuring head (1) and pressure measuring rod and pressure-measuring pipe (7), adopt money base brazing, mount pad (5) is placed on the 3rd pole (3) outside, for location and installation, pressure connects mouth (8) one end and is connected with pressure-measuring pipe (7), the other end is connected with rear end pressure scanning element, changes pressure signal into the signal of telecommunication. Pressure-measuring head (1) adopts 304 stainless steels, GH128 high temperature alloy or brass material to be processed into.
Description about technique effect:
The present invention is directed to traditional five-hole probe and seven-hole probe, proposed a kind of 12 hole omnidirectional probes of measuring for complicated subsonic speed three-dimensional flow field. That this 12 hole omnidirectional probe has is simple in structure, certainty of measurement is high and can measure the features such as flow angle scope is wide. It can reach following technical indicator:
Flow angle measurement category :-165～165 °;
Measurement result: angular resolution: ± 1 °;
Flowing velocity scope: 5m/s～306m/s (Ma=0.9);
Total velocity error: ± 1%;
Measuring media: the 12 hole probes that pressure-measuring head diameter is 5mm～15mm are air, the 12 hole probes that pressure-measuring head diameter is 15mm～30mm are water;
Flow field temperature limiting: 200K～1500K;
Maximum sample frequency: 2KHz;
About Figure of description
Fig. 1 is omnidirectional's probe structure schematic diagram;
Wherein, 1, pressure-measuring head; 2, the first pole; 3, the second pole; 4, the 3rd pole; 5, mount pad; 6, locating ring; 7, pressure-measuring pipe; 8, pressure connects mouth;
Detailed description of the invention:
The 12 hole omnidirectional probes that the present invention is designed, concrete structure comprises that pressure-measuring head (1), pressure measuring rod, mount pad (5), locating ring (6), pressure-measuring pipe (7), pressure connect mouth (8); Wherein, pressure measuring rod is hollow-core construction, comprises the first pole (2), the second pole (3), the 3rd pole (4); Pressure-measuring head (1) is sphere structure, and pressure-measuring head (1) diameter is 5mm～30mm, and through electric spark or electrolytic formation processing, pressure-measuring head (1) adopts 304 stainless steels, GH128 high temperature alloy or brass material to be processed into. On pressure-measuring head (1), be distributed with 12 pressure taps, pressure tap is positioned on 12 summits of positive 20 bodies that connect with pressure-measuring head (1); Pressure-measuring head (1) diameter is 20～40 with pressure tap diameter ratio; The diameter ratio of pressure-measuring head (1) diameter and the first pole (2) is 2～5; The length ratio of pressure-measuring head diameter and the first pole (2) is 1～3; Pressure-measuring pipe (7) one end connects mouth (8) with pressure and is connected, the other end is connected with pressure-measuring head (1) through pressure-measuring pipe (7), between pressure-measuring head (1) and pressure measuring rod and pressure-measuring pipe (7), adopt money base brazing, mount pad (5) is placed on the 3rd pole (3) outside, for location and installation, pressure connects mouth (8) one end and is connected with pressure-measuring pipe (7), the other end is connected with rear end pressure scanning element, changes pressure signal into the signal of telecommunication.
12 designed hole omnidirectional probe detailed description of the invention of the present invention comprise: theory analysis, engineering design, calibration and using method four steps:
1 theory analysis
First calculate and analogue simulation by theory, determine the situation current downflow characteristic of Gai Xing12Kong omnidirectional probe at friction speed and flow field angularity, such as pressure size, temperature range. Prepare for calibration process medium velocity and choosing of deflection scope simultaneously.
2 engineering designs and processing
1) choose pressure-measuring head size according to tested object, then according to material behavior and Design Processing pressure tap diameter;
2) choose material and the size of air hose according to theory analysis pressure and temperature scope;
3) determine supporting construction form (straight-bar, L-type or C type) according to test request, and analyze its bearing capacity; Design corresponding group section form and size simultaneously;
4) design corresponding mount pad according to displacement mechanism.
5) pressure-measuring head adopts spark machined mode, needs to carry out the tolerances such as each pressure tap position degree and circularity and detect after processing;
6) weld according to design general assembly drawing, the present invention all adopts money base soldering everywhere. Postwelding sanding weld seam, keeps external form, and all weld seam dye penetration inspections, require postwelding without slag inclusion, defects i.e.cracks;
7) air hose polishing burr, maintenance sharp edge; Before assembling, should clean ventilation inspection;
3 calibrations
After 12 hole omnidirectional probe design, need could use through calibration, concrete calibration process is:
1) determine speed point and deflection calibration point according to test condition;
2) according to calibration point, 12 hole omnidirectional probes are arranged on to calibration with on displacement mechanism, be placed in standard wind-tunnel, calibrate;
3) by the data allocations of calibration data base to All Ranges, subregion is organized into dimensionless factor C by measurement result by formula (5-20)θ-cal，Cφ-cal，Cs-calAnd Ct-cal。
4) calculate the stationary point of each subregion the coordinate figure of local frame of reference (θ,)。
5) according to the result of calibration point data surface of second order matching, pressure tap coordinate figure is carried out to preliminary assessment.
4 usings method
1) according to three maximum pressure values in 12 hole omnidirectional probes, the zone number at place, stationary point and corresponding coefficient of region can obtain measuring time. Now, need inspection area numbering existence and reasonability.
2) the coefficient C of calculating test dataθWithAnd estimate qest。
3) from select 30 groups with close Cθ-cal，And calculating formula (21) is calculated apart from d. In order rationally to process near the test data point in partition boundaries, need to select adjacent 10 regions to calculate. Meanwhile, the calibration data of selection point is distributed in CθWithIn rectangular coordinate system for reference axis.
4) select 8 calibration data points of d minimum, simulate the minimum curved surface of its four flow parameters (both direction angle and total static pressure).
5) calculate test data according to fitting surface and put corresponding local coordinate system parameter θ,CsAnd Ct。
6) by the θ of test data point,Convert global coordinate system coning angle Θ and roll angle Ф to.
7) static pressure and stagnation pressure are pressed equation (23,24) calculating,
Ps＝Pmax1-Cs·qest(23)
Pt＝Pmax1-Ct·qest(24)。
Claims (2)
1. for 12 hole omnidirectional probes of subsonic speed complex three-dimensional flow field survey, comprise pressure-measuring head (1), pressure measuring rod, peaceDress seat (5), locating ring (6), pressure-measuring pipe (7), pressure connect mouth (8); Wherein, pressure measuring rod is hollow-core construction, comprises firstPole (2), the second pole (3), the 3rd pole (4); Pressure-measuring head (1) is sphere structure, pressure-measuring head (1) diameter be 5mm～30mm, through electric spark or electrolytic formation processing, is distributed with 12 pressure taps on pressure-measuring head (1), pressure tap is positioned at and pressure-measuring head(1) on 12 summits of positive 20 bodies that connect in; Pressure-measuring head (1) diameter is 20～40 with pressure tap diameter ratio; Pressure-measuring head(1) the diameter ratio of diameter and the first pole (2) is 2～5; The length ratio of pressure-measuring head diameter and the first pole (2) is 1～3; Pressure-measuring pipe (7) one end connects mouth (8) with pressure and is connected, and the other end is connected with pressure-measuring head (1) through pressure-measuring pipe (7), surveysBetween pressure head (1) and pressure measuring rod and pressure-measuring pipe (7), adopt money base brazing, mount pad (5) is placed on the 3rd pole (3)Outside, for location and installation, pressure connects mouth (8) one end and is connected with pressure-measuring pipe (7), the other end and rear end pressure scanning unitPart is connected, and changes pressure signal into the signal of telecommunication.
2. the 12 hole omnidirectional probes for subsonic speed complex three-dimensional flow field survey as claimed in claim 1, is characterized in that,Pressure-measuring head (1) adopts 304 stainless steels, GH128 high temperature alloy or brass material to be processed into.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510937312.XA CN105588703A (en) | 2015-12-15 | 2015-12-15 | 12-hole omni-directional probe for subsonic-speed and complex three-dimensional flow field measurement |
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| CN201510937312.XA CN105588703A (en) | 2015-12-15 | 2015-12-15 | 12-hole omni-directional probe for subsonic-speed and complex three-dimensional flow field measurement |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106885683A (en) * | 2017-03-08 | 2017-06-23 | 北京航空航天大学 | A kind of hole steady state pressure probe of hemispherical head 12 for measuring 3 D complex flow field |
| 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 |
| CN106908191A (en) * | 2017-03-09 | 2017-06-30 | 北京航空航天大学 | A kind of dynamic temperature force combination probe for measuring across sound Two Dimensional Unsteady flow field |
| CN106989895A (en) * | 2017-04-17 | 2017-07-28 | 北京航空航天大学 | A kind of 12 hole dynamic pressure probes for measuring three-dimensional non-steady complex flowfield |
| CN108072528A (en) * | 2016-11-16 | 2018-05-25 | 中国科学院工程热物理研究所 | A kind of test system of suitable aero-engine Strong shear nonstationary flow |
| CN109596361A (en) * | 2018-12-16 | 2019-04-09 | 中国航发沈阳发动机研究所 | Pressure-measuring pipe installation method and engine complete machine combustor exit stagnation pressure test suite |
| PL441163A1 (en) * | 2022-05-13 | 2023-11-20 | General Electric Company Polska Spółka Z Ograniczoną Odpowiedzialnością | Methods, apparatus and products for measuring fluid pressure |
| WO2024040230A1 (en) * | 2022-08-19 | 2024-02-22 | Schlumberger Technology Corporation | Electrical stability probe with temperature sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108072528A (en) * | 2016-11-16 | 2018-05-25 | 中国科学院工程热物理研究所 | A kind of test system of suitable aero-engine Strong shear nonstationary flow |
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| CN106885683A (en) * | 2017-03-08 | 2017-06-23 | 北京航空航天大学 | A kind of hole steady state pressure probe of hemispherical head 12 for measuring 3 D complex flow field |
| CN106908191A (en) * | 2017-03-09 | 2017-06-30 | 北京航空航天大学 | A kind of dynamic temperature force combination probe for measuring across sound Two Dimensional Unsteady flow field |
| CN106908191B (en) * | 2017-03-09 | 2020-11-13 | 北京航空航天大学 | Dynamic temperature and pressure combined probe for measuring transonic two-dimensional unsteady flow field |
| CN106989895A (en) * | 2017-04-17 | 2017-07-28 | 北京航空航天大学 | A kind of 12 hole dynamic pressure probes for measuring three-dimensional non-steady complex flowfield |
| CN106989895B (en) * | 2017-04-17 | 2019-04-16 | 北京航空航天大学 | A kind of 12 hole dynamic pressure probes measuring three-dimensional non-steady complex flowfield |
| CN109596361A (en) * | 2018-12-16 | 2019-04-09 | 中国航发沈阳发动机研究所 | Pressure-measuring pipe installation method and engine complete machine combustor exit stagnation pressure test suite |
| PL441163A1 (en) * | 2022-05-13 | 2023-11-20 | General Electric Company Polska Spółka Z Ograniczoną Odpowiedzialnością | Methods, apparatus and products for measuring fluid pressure |
| WO2024040230A1 (en) * | 2022-08-19 | 2024-02-22 | Schlumberger Technology Corporation | Electrical stability probe with temperature sensor |
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