CN220418679U - Hanging type double stagnation cover total temperature probe head based on platinum resistor - Google Patents
Hanging type double stagnation cover total temperature probe head based on platinum resistor Download PDFInfo
- Publication number
- CN220418679U CN220418679U CN202221958974.7U CN202221958974U CN220418679U CN 220418679 U CN220418679 U CN 220418679U CN 202221958974 U CN202221958974 U CN 202221958974U CN 220418679 U CN220418679 U CN 220418679U
- Authority
- CN
- China
- Prior art keywords
- stagnation cover
- cover
- layer
- stagnation
- total temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 239000000523 sample Substances 0.000 title claims abstract description 37
- 229910052697 platinum Inorganic materials 0.000 title claims abstract description 35
- 239000010410 layer Substances 0.000 claims abstract description 103
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 7
- 230000005855 radiation Effects 0.000 claims abstract description 7
- 239000002356 single layer Substances 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 claims abstract description 4
- 238000009434 installation Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The utility model relates to the technical field of total temperature testing, in particular to a head of a suspended double stagnation cover total temperature probe based on a platinum resistor. In order to solve the problems of insufficient measurement precision and narrow insensitive angle range of the head of the existing total temperature probe, the utility model adopts an armored platinum resistor to replace a thermocouple as a temperature sensing element, improves the precision of the sensor, correspondingly improves the structure of a stagnation cover, adopts an inner stagnation cover and an outer stagnation cover, and is convenient to process and install because the inner stagnation cover is hung inside the outer stagnation cover through a connecting section; the air flow in the outer layer stagnation cover fully heats the root of the sensor and the wall surface of the inner layer stagnation cover, so that heat conduction and radiation errors are reduced; the inlets of the inner and outer stagnation covers are uniformly provided with a plurality of air inlet grooves along the circumferential direction, so that the insensitive angle range of total temperature measurement is effectively widened; compared with a single-layer stagnation cover, the double-layer stagnation cover has lower inner flow speed, better air flow stagnation effect and capability of obviously reducing speed errors.
Description
Technical Field
The utility model relates to the technical field of total temperature testing, in particular to a total temperature probe head adopting a hanging double stagnation cover based on an armored platinum resistance sensor.
Background
For the compressor part of an aeroengine, isentropic efficiency is an important performance parameter that can measure the advancement and economy of the compressor. In the compressor component experiment, the isentropic efficiency is usually measured by adopting a temperature rise method or a torque method, and for the isentropic efficiency of a single-stage compressor, only the temperature rise method can be adopted for measurement. Wen Shengfa the calculation formula for measuring the isentropic efficiency of the compressor is as follows:
wherein eta c Representing isentropic efficiency of the compressor, T t1 And T t2 Respectively representing the total temperature of the inlet and outlet of the air compressor, pi c Represents the total pressure ratio of the compressor, and k represents the specific heat ratio. For Wen Shengfa to measure isentropic efficiency, the smaller the inlet and outlet Wen Shengyue is, the greater the difficulty in accurately measuring isentropic efficiency is, and the main reason is that the temperature rise of the inlet and outlet is relatively larger than the measurement error.
The performance of a total temperature probe in measuring the total temperature of a gas stream is generally evaluated by using a total temperature recovery coefficient r, which is defined as:
T g indicating the temperature measured by the probe, T t Indicating total temperature of incoming flow, T s The incoming flow static temperature is represented, and due to a certain stagnation effect when the air flow flows around the total temperature probe, the air flow cannot be completely stopped, and is limited by the influence of the sensor precision, the heat conduction and radiation effect of the support rod, and the temperature sensor has a constant T t >T g >T s This is true. From this, the closer the probe measured temperature is to the total temperature of the incoming flow, the closer the total temperature recovery coefficient is to 1, and the better the performance of the total temperature probe.
When the total temperature of the flow field of the compressor is measured by adopting a thermocouple total temperature probe, three main defects exist: firstly, the thermocouple sensor has poor precision; secondly, when the air flow speed is higher, a single-layer stagnation cover adopted by the conventional total temperature probe is difficult to avoid larger speed errors, and when the air flow angle is increased, the total temperature recovery coefficient is greatly reduced; third, the total temperature measurement is performed in a flow field with little difference from the external environment temperature, but still has certain heat conduction errors and radiation errors. Therefore, there is an urgent need to develop a total temperature probe head with a wide insensitive angle range that can perform high accuracy measurement of total temperature in a small temperature rise compressor performance test.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims at providing a total temperature probe head based on a platinum resistance sensor and adopting a hanging type double stagnation cover so as to solve the problems of insufficient measurement precision and narrow insensitive angle range of the existing total temperature probe head.
In order to solve the technical problems, a platinum resistor is adopted to replace a thermocouple to serve as a temperature sensing element, so that the accuracy of the sensor is improved, the structure of the stagnation cover is correspondingly improved, an inner stagnation cover and an outer stagnation cover are adopted, and the inner stagnation cover is hung inside the outer stagnation cover through a connecting section, so that the processing and the installation are facilitated; the air flow in the inner layer stagnation chamber is subjected to first stagnation near the top of the sensor and exchanges heat with the sensor, then flows out of the air outlet hole in the root connecting section of the inner layer stagnation cover, is subjected to second stagnation, the speed of the air flow is obviously reduced after the two stagnation, and the total temperature recovery characteristic is good; the outer airflow flows into the outer stagnation cover, so that the root of the sensor and the wall surface of the inner stagnation cover can be fully heated, and the heat conduction and radiation errors are reduced; the inlets of the inner and outer stagnation covers are uniformly provided with a plurality of air inlet grooves along the circumferential direction, so that the insensitive angle range of total temperature measurement can be effectively widened. The method is characterized in that: consists of an armored platinum resistor (1), an inner layer stagnation cover (2) and an outer layer stagnation cover (3); the armored platinum resistor (1) is used as a temperature sensing element of the total temperature probe, and the armored or bare type can be selected according to the specific environment; an inlet of the inner layer stagnation cover (2) is provided with an air inlet groove (4), and an inlet of the outer layer stagnation cover (3) is provided with an air inlet groove (5); a connecting section (7) is arranged between the inner-layer stagnation cover and the outer-layer stagnation cover, the center of the connecting section is provided with an air outlet hole (6), and air flow entering the inner-layer stagnation cover flows out from the connecting section.
Preferably, the outer diameter of the outer layer stagnation cover (3) is 23/32 to 25/32 of the length thereof, and the wall thickness of the outer layer stagnation cover (3) is 1/16 to 5/48 of the outer diameter thereof.
Preferably, the length of the outer layer stagnation cover air inlet groove (5) is 5/16 to 7/16 of the length of the outer layer stagnation cover (3), the width of the outer layer stagnation cover air inlet groove (5) is 1/2 to 1 time of the wall thickness of the outer layer stagnation cover (3), and the number of the outer layer stagnation cover air inlet grooves (5) which are uniformly formed in the circumferential direction is 2 to 8.
Preferably, the length of the inner layer stagnation cover (2) is 21/32 to 23/32 of the length of the outer layer stagnation cover (3), the outer diameter of the inner layer stagnation cover (2) is 5/8 to 17/24 of the outer diameter of the outer layer stagnation cover (3), and the wall thickness of the inner layer stagnation cover (2) is 3/32 to 5/32 of the outer diameter thereof.
Preferably, the length of the inner layer stagnation cover air inlet groove (4) is 2/11 to 4/11 of the length of the inner layer stagnation cover (2), the width of the inner layer stagnation cover air inlet groove (4) is 1/2 to 1 times of the wall thickness of the inner layer stagnation cover (2), and the number of the inner layer stagnation cover air inlet grooves which are uniformly formed in the circumferential direction is 2 to 8.
Preferably, the distance between the axis of the connecting section (7) and the bottom surface of the inner-layer stagnation cover (2) is 5/22 to 7/22 of the length of the inner-layer stagnation cover (2), the diameter of the connecting section (7) is 5/22 to 7/22 of the length of the inner-layer stagnation cover (2), and the upper end and the lower end of the connecting section (7) are respectively inserted into the connecting holes which are pre-punched in the outer-layer stagnation cover (3) and the inner-layer stagnation cover (2) and are fixed through welding.
Preferably, the diameter of the air outlet hole (6) is 1/2 to 5/6 of the diameter of the connecting section (7), the length of the armored platinum resistor (1) extending into the stagnation cover is 19/32 to 21/32 of the length of the outer stagnation cover (3), and the diameter of the armored platinum resistor (1) is 7/32 to 9/32 of the outer diameter of the outer stagnation cover (3).
The head of the total temperature probe adopts an armored platinum resistor to replace a thermocouple as a temperature sensing element, so that the accuracy of the sensor is improved, the structure of the stagnation cover is correspondingly improved, an inner stagnation cover and an outer stagnation cover are adopted, and the inner stagnation cover is hung inside the outer stagnation cover through a connecting section, so that the processing and the installation are facilitated; the air flow in the outer layer stagnation cover fully heats the root of the sensor and the wall surface of the inner layer stagnation cover, so that heat conduction and radiation errors are reduced; the inlets of the inner and outer stagnation covers are uniformly provided with a plurality of air inlet grooves along the circumferential direction, so that the insensitive angle range of total temperature measurement is effectively widened; compared with a single-layer stagnation cover, the double-layer stagnation cover has lower inner flow speed, better air flow stagnation effect and capability of obviously reducing speed errors.
Compared with the prior art, the suspended double-stagnation cover total temperature probe head based on the platinum resistor has the advantages that due to the adoption of the armored platinum resistor and the double-layer stagnation cover, compared with the existing total temperature probe adopting the thermocouple and the single-layer stagnation cover, the sensor precision is effectively improved, the speed error, the heat conduction error and the radiation error are reduced, and the total temperature measurement precision is higher; the inlets of the inner and outer stagnation covers are provided with a plurality of air inlet grooves, so that the air flow insensitive angle range of the total temperature probe is effectively widened, and the total temperature recovery coefficient can be kept basically stable in a larger air flow angle range.
Drawings
Fig. 1 is a side view of an embodiment of the present utility model.
FIG. 2 is a cross-sectional view of an embodiment of the present utility model taken along the plane of the centerline of the exit aperture.
Fig. 3 is a top view of an embodiment of the present utility model.
Fig. 4 is a front view of an embodiment of the present utility model.
In the drawings, the reference numerals and corresponding part names: 1-platinum resistance; 2-an inner stagnation cover; 3-an outer stagnation cover; 4-an air inlet groove of the inner stagnation cover; 5-an outer layer stagnation cover air inlet groove; 6-connecting sections; 7-an air outlet hole.
Detailed Description
Aiming at the defects in the prior art, the utility model aims at providing a total temperature probe head based on a platinum resistance sensor and adopting a hanging type double stagnation cover so as to solve the problems of insufficient measurement precision and narrow insensitive angle range of the existing total temperature probe head.
The utility model provides a hanging type double stagnation cover total temperature probe head based on a platinum resistor, which is described in detail with reference to the accompanying drawings.
Fig. 1, fig. 2, fig. 3 and fig. 4 are schematic structural diagrams of an embodiment of the present utility model, which are a head of a suspended double-stagnation cover total temperature probe based on a platinum resistor, and are characterized in that the head consists of an armored platinum resistor (1), an inner stagnation cover (2) and an outer stagnation cover (3); the armored platinum resistor (1) is used as a temperature sensing element of the total temperature probe, and the armored or bare type can be selected according to the specific environment; an inlet of the inner layer stagnation cover (2) is provided with an air inlet groove (4), and an inlet of the outer layer stagnation cover (2) is provided with an air inlet groove (5); a connecting section (7) is arranged between the inner-layer stagnation cover and the outer-layer stagnation cover, the center of the connecting section is provided with an air outlet hole (6), and air flow entering the inner-layer stagnation cover flows out from the connecting section.
Preferably, the outer diameter of the outer layer stagnation cover (3) is 3/4 of the length thereof, and the wall thickness of the outer layer stagnation cover (3) is 1/12 of the outer diameter thereof.
Preferably, the length of the outer layer stagnation cover air inlet groove (5) is 3/8 of the length of the outer layer stagnation cover (3), the width of the outer layer stagnation cover air inlet groove (5) is 1/2 of the wall thickness of the outer layer stagnation cover (3), and the number of the outer layer stagnation cover air inlet grooves (5) which are uniformly formed in the circumferential direction is 4.
Preferably, the length of the inner layer stagnation cover (2) is 11/16 of the length of the outer layer stagnation cover (3), the outer diameter of the inner layer stagnation cover (2) is 2/3 of the outer diameter of the outer layer stagnation cover (3), and the wall thickness of the inner layer stagnation cover (2) is 1/8 of the outer diameter.
Preferably, the length of the inner-layer stagnation cover air inlet groove (4) is 3/11 of the length of the inner-layer stagnation cover (2), the width of the inner-layer stagnation cover air inlet groove (4) is 1/2 of the wall thickness of the inner-layer stagnation cover (2), and the number of the inner-layer stagnation cover air inlet grooves (4) which are uniformly formed in the circumferential direction is 4.
Preferably, the distance between the axis of the connecting section (7) and the bottom surface of the inner-layer stagnation cover (2) is 3/11 of the length of the inner-layer stagnation cover (2), the diameter of the connecting section (7) is 3/11 of the length of the inner-layer stagnation cover (2), and the upper end and the lower end of the connecting section (7) are respectively inserted into the connecting holes which are pre-punched in the outer-layer stagnation cover (3) and the inner-layer stagnation cover (2) and are fixed through welding.
Preferably, the diameter of the air outlet hole (6) is 2/3 of the diameter of the connecting section (7), the length of the armored platinum resistor (1) extending into the stagnation cover is 5/8 of the length (3) of the outer stagnation cover, and the diameter of the armored platinum resistor (1) is 1/4 of the outer diameter of the outer stagnation cover (3).
The suspended double-layer stagnation cover is adopted, so that the head of the total temperature probe can be conveniently processed and installed.
Through adopting armor platinum resistance and double-deck stagnation cover, compare with current total temperature probe that adopts thermocouple and individual layer stagnation cover, can improve the sensor precision, effectively reduce heat conduction error and radiation error, total temperature measurement accuracy is higher.
The inlet of the inner and outer stagnation covers is provided with a plurality of air inlet grooves, so that the air flow insensitive angle range of the total temperature probe is effectively widened, and the total temperature recovery coefficient can be kept basically stable in a larger air flow angle range.
Although the preferred embodiment has been described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the utility model. It is to be understood that the present utility model has been described by way of illustration and not limitation.
Claims (1)
1. A hanging type double stagnation cover total temperature probe head based on a platinum resistor is characterized in that: consists of an armored platinum resistor (1), an inner layer stagnation cover (2) and an outer layer stagnation cover (3); the armored platinum resistor (1) is used as a temperature sensing element of the total temperature probe; an air inlet of the inner-layer stagnation cover (2) is provided with an air inlet groove (4) of the inner-layer stagnation cover, and an air inlet of the outer-layer stagnation cover (3) is provided with an air inlet groove (5) of the outer-layer stagnation cover; a connecting section (7) is arranged between the inner layer stagnation cover and the outer layer stagnation cover, the center of the connecting section is provided with an air outlet hole (6), and air flow entering the inner layer stagnation cover flows out from the air outlet hole;
the outer-layer stagnation cover (3) of the head of the suspended double stagnation cover total temperature probe based on the platinum resistor has the outer diameter of 23/32 to 25/32 of the length, and the wall thickness of the outer-layer stagnation cover (3) is 1/16 to 5/48 of the outer diameter;
the length of an outer layer stagnation cover air inlet groove (5) of the head part of the hanging type double stagnation cover total temperature probe based on the platinum resistor is 5/16 to 7/16 of the length of the outer layer stagnation cover (3), the width of the outer layer stagnation cover air inlet groove (5) is 1/2 to 1 times of the wall thickness of the outer layer stagnation cover (3), and the number of the outer layer stagnation cover air inlet grooves is 2 to 8;
the length of the inner layer stagnation cover (2) of the head part of the suspended double stagnation cover total temperature probe based on the platinum resistor is 21/32 to 23/32 of the length of the outer layer stagnation cover (3), the outer diameter of the inner layer stagnation cover (2) is 5/8 to 17/24 of the outer diameter of the outer layer stagnation cover (3), and the wall thickness is 3/32 to 5/32 of the outer diameter;
the length of the inner layer stagnation cover air inlet groove (4) of the head part of the hanging type double stagnation cover total temperature probe based on the platinum resistor is 2/11 to 4/11 of the length of the inner layer stagnation cover (2), the width of the inner layer stagnation cover air inlet groove (4) is 1/2 to 1 times of the wall thickness of the inner layer stagnation cover (2), and the number of the inner layer stagnation cover air inlet grooves which are uniformly arranged in the circumferential direction is 2 to 8;
the distance between the axis of the head connecting section (7) of the hanging type double-stagnation cover total temperature probe based on the platinum resistor and the bottom surface of the inner-layer stagnation cover (2) is 5/22 to 7/22 of the length of the inner-layer stagnation cover (2), the diameter of the connecting section (7) is 5/22 to 7/22 of the length of the inner-layer stagnation cover (2), and the upper end and the lower end of the connecting section (7) are respectively inserted into the connecting holes of the outer-layer stagnation cover and the inner-layer stagnation cover which are pre-punched and are fixed through welding;
the diameter of the air outlet hole (6) at the head of the hanging type double-stagnation cover total temperature probe based on the platinum resistor is 1/2 to 5/6 of the diameter of the connecting section (7), the length of the armored platinum resistor (1) extending into the stagnation cover is 19/32 to 21/32 of the length of the outer-layer stagnation cover (3), and the diameter of the armored platinum resistor (1) is 7/32 to 9/32 of the outer diameter of the outer-layer stagnation cover (3);
the head of the total temperature probe adopts an armored platinum resistor to replace a thermocouple as a temperature sensing element, so that the accuracy of the sensor is improved, the structure of the stagnation cover is correspondingly improved, an inner stagnation cover and an outer stagnation cover are adopted, and the inner stagnation cover is hung inside the outer stagnation cover through a connecting section, so that the processing and the installation are facilitated; the air flow in the outer layer stagnation cover fully heats the root of the sensor and the wall surface of the inner layer stagnation cover, so that heat conduction and radiation errors are reduced; the inlets of the inner and outer stagnation covers are uniformly provided with a plurality of air inlet grooves along the circumferential direction, so that the insensitive angle range of total temperature measurement is effectively widened; compared with a single-layer stagnation cover, the double-layer stagnation cover has lower inner flow speed, better air flow stagnation effect and capability of obviously reducing speed errors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221958974.7U CN220418679U (en) | 2022-07-28 | 2022-07-28 | Hanging type double stagnation cover total temperature probe head based on platinum resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221958974.7U CN220418679U (en) | 2022-07-28 | 2022-07-28 | Hanging type double stagnation cover total temperature probe head based on platinum resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220418679U true CN220418679U (en) | 2024-01-30 |
Family
ID=89643627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221958974.7U Active CN220418679U (en) | 2022-07-28 | 2022-07-28 | Hanging type double stagnation cover total temperature probe head based on platinum resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220418679U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115435913A (en) * | 2022-07-28 | 2022-12-06 | 北京航空航天大学 | Suspension type double stagnation cover total temperature probe head based on platinum resistor |
-
2022
- 2022-07-28 CN CN202221958974.7U patent/CN220418679U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115435913A (en) * | 2022-07-28 | 2022-12-06 | 北京航空航天大学 | Suspension type double stagnation cover total temperature probe head based on platinum resistor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104048808B (en) | A kind of kolmogorov sinai entropy probe | |
| CN220418679U (en) | Hanging type double stagnation cover total temperature probe head based on platinum resistor | |
| CN109583067B (en) | Design method of high-speed aircraft transition position measurement sensor based on temperature balance | |
| CN219736607U (en) | Platinum resistance total temperature probe head with outer layer stagnation cover | |
| CN115435929A (en) | High-frequency total temperature and total pressure probe | |
| CN106940230B (en) | Nine-hole total temperature measuring probe | |
| CN110333090B (en) | Method for testing performance of lubricating oil-fired radiator | |
| CN111076832A (en) | Radiation-proof total temperature measuring probe | |
| CN111089704A (en) | Probe for measuring whole parameters of transonic three-dimensional steady-state flow field | |
| CN108917965B (en) | Total temperature probe head based on thermal resistor and provided with wide insensitive angle | |
| CN111089702A (en) | Probe for measuring full parameters of subsonic three-dimensional steady-state flow field | |
| CN212082825U (en) | Full-parameter probe for measuring high subsonic three-dimensional steady flow field | |
| CN106840268B (en) | Five-hole probe integrating total temperature measurement | |
| CN111256940A (en) | Multipoint dynamic measuring device with total pressure measuring points arranged back to back for total temperature | |
| CN111089700A (en) | Multi-point dynamic full-parameter measuring device for subsonic two-dimensional flow field | |
| CN115435915B (en) | Inner container type double stagnation cover total temperature probe head based on platinum resistor | |
| CN108318090B (en) | Flowmeter suitable for large-caliber pipeline flow measurement | |
| Uffrecht et al. | Electro-thermal measurement of heat transfer coefficients | |
| CN115435913A (en) | Suspension type double stagnation cover total temperature probe head based on platinum resistor | |
| CN106918409B (en) | Porous close-proximity total temperature probe | |
| CN211696881U (en) | Multipoint dynamic measuring device with total pressure measuring points arranged back to back for total temperature | |
| CN211668740U (en) | Multi-point dynamic full-parameter measuring device for subsonic two-dimensional flow field | |
| CN212082824U (en) | Probe for measuring whole parameters of transonic three-dimensional steady-state flow field | |
| Rupesh Ms et al. | Experimental and Computational Evaluation of Five Hole Five Probe Flow Analyzer for Subsonic Wind Calibration | |
| CN115435914A (en) | Platinum resistor total temperature probe head with outer stagnation cover |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |