CN115435913A - Suspension type double stagnation cover total temperature probe head based on platinum resistor - Google Patents
Suspension type double stagnation cover total temperature probe head based on platinum resistor Download PDFInfo
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- CN115435913A CN115435913A CN202210894804.5A CN202210894804A CN115435913A CN 115435913 A CN115435913 A CN 115435913A CN 202210894804 A CN202210894804 A CN 202210894804A CN 115435913 A CN115435913 A CN 115435913A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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Abstract
The invention relates to the technical field of total temperature testing, in particular to a head of a total temperature probe based on a platinum resistance sensor and adopting a hanging type double stagnation cover. In order to solve the problems of insufficient measurement precision and narrow insensitive angle range of the head part of the conventional total temperature probe, a platinum resistor is adopted to replace a thermocouple as a temperature sensing element, so that the precision of the sensor is improved; an inner stagnation cover and an outer stagnation cover are adopted, and the inner stagnation cover is hung in the outer stagnation cover through a connecting section, so that the processing and the installation are convenient; airflow in the inner stagnation chamber is subjected to first stagnation near the top of the sensor, then flows out of the air outlet hole at the root of the inner stagnation cover and is subjected to second stagnation, the airflow speed is obviously reduced after twice stagnation, and the total temperature recovery characteristic is good; the air flow in the outer stagnation chamber can fully heat the root of the sensor and the wall surface of the inner stagnation cover, so that the heat conduction and radiation errors can be reduced; a plurality of air inlet grooves are uniformly formed in the inlets of the inner stagnation cover and the outer stagnation cover along the circumferential direction, so that the insensitive angle range of total temperature measurement can be effectively widened.
Description
Technical Field
The invention relates to the technical field of total temperature testing, in particular to a head part of a total temperature probe based on an armored platinum resistance sensor and adopting a hanging type double stagnation cover.
Background
For compressor components of aircraft engines, isentropic efficiency is an important performance parameter that can measure the advancement and economy of the compressor. Usually, in the experiment of the compressor part, the isentropic efficiency is measured by adopting a temperature rise method or a torque method, and for the isentropic efficiency of the single-stage compressor, the temperature rise method can only be adopted for measurement. The calculation formula for measuring the isentropic efficiency of the gas compressor by the temperature rise method is as follows:
wherein eta c Expressing compressor isentropic efficiency, T t1 And T t2 Respectively represents the total temperature of the inlet and the outlet of the gas compressor, pi c And k represents a total pressure ratio of the compressor, and k represents a specific heat ratio. For measuring the isentropic efficiency by a temperature rise method, the smaller the temperature rise of an inlet and an outlet is, the greater the difficulty in accurately measuring the isentropic efficiency is, and the main reason is that the relative measurement error of the temperature rise of the inlet and the outlet is larger.
The performance of the total temperature probe to measure the total temperature of the gas stream is generally evaluated using a total temperature recovery coefficient r, which is defined as:
T g indicates the measured temperature, T, of the probe t Indicates the total temperature of the incoming flow, T s The static temperature of incoming flow is shown, because the air flow flows around the total temperature probe, the static temperature of the incoming flow is not completely stopped due to a certain stagnation effect, and the static temperature is limited by the influence of the precision of the sensor, the heat conduction of the supporting rod and the radiation effect, and T is constant t >T g >T s This is true. Therefore, the closer the temperature measured by the probe 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 is.
When a thermocouple total temperature probe is generally adopted to measure the total temperature of a flow field of a gas compressor, the thermocouple total temperature probe mainly has three defects: firstly, the accuracy of the thermocouple sensor is poor; secondly, when the air flow velocity is high, a single-layer stagnation cover adopted by a conventional total temperature probe is difficult to avoid a large velocity error, and the total temperature recovery coefficient is greatly reduced when the air flow angle is increased; thirdly, although the total temperature measurement is carried out in a flow field with little difference with the external environment temperature, certain heat conduction errors and radiation errors still exist. Therefore, the development of a total temperature probe head which can perform total temperature high-precision measurement in a small temperature rise compressor performance test and has a wide insensitive angle range is urgently needed.
Disclosure of Invention
Aiming at the defects in the prior art, the core object of the invention is to provide a head part of a total temperature probe 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 head part of the conventional total temperature probe.
In order to solve the technical problems, a platinum resistor is adopted to replace a thermocouple as a temperature sensing element, the precision 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 in the outer stagnation cover through a connecting section, so that the processing and the installation are convenient; the airflow in the inner stagnation chamber generates first stagnation near the top of the sensor, exchanges heat with the sensor, then flows out of the air outlet hole in the connecting section at the root part of the inner stagnation cover, generates second stagnation, and has better total temperature recovery characteristic because the airflow speed is obviously reduced after twice stagnation; the outer layer airflow flows into the outer layer stagnation cover, so that the root of the sensor and the wall surface of the inner layer stagnation cover can be fully heated, and heat conduction and radiation errors are reduced; a plurality of air inlet grooves are uniformly formed in the inlets of the inner stagnation cover and the outer stagnation cover along the circumferential direction, so that the insensitive angle range of total temperature measurement can be effectively widened. The method is characterized in that: the resistor is composed of a platinum resistor (1), an inner stagnation cover (2) and an outer stagnation cover (3); the platinum resistor (1) is used as a temperature sensing element of the total temperature probe, and the armored or naked type can be selected according to the specific environment; an inlet of the inner stagnation cover (2) is provided with an air inlet groove (4), and an inlet of the outer 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, an air outlet (6) is formed in the center, and air flow entering the inner layer stagnation cover flows out from the air outlet.
Preferably, the outer diameter of the outer stagnation cover (3) is 23/32 to 25/32 of the length of the outer stagnation cover, and the wall thickness of the outer stagnation cover (3) is 1/16 to 5/48 of the outer diameter of the outer stagnation cover.
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 arranged in the circumferential direction is 2 to 8.
Preferably, the length of the inner stagnation cover (2) is 21/32 to 23/32 of the length of the outer stagnation cover (3), the outer diameter of the inner stagnation cover (2) is 5/8 to 17/24 of the outer diameter of the outer stagnation cover (3), and the wall thickness of the inner stagnation cover (2) is 3/32 to 5/32 of the outer diameter of the inner stagnation cover.
Preferably, the length of the air inlet grooves (4) of the stagnation cover at the inner layer is 2/11 to 4/11 of the length of the stagnation cover at the inner layer, the width of the air inlet grooves (4) of the stagnation cover at the inner layer is 1/2 to 1 time of the wall thickness of the stagnation cover at the inner layer, and the number of the air inlet grooves uniformly arranged at the circumferential direction of the stagnation cover at the inner layer 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 pre-drilled connecting holes of 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 (6) is 1/2 to 5/6 of the diameter of the connecting section (7), the length of the platinum resistor (1) extending into the stagnation cover is 19/32 to 21/32 of the length (3) of the outer stagnation cover, and the diameter of the platinum resistor (1) is 7/32 to 9/32 of the outer diameter of the outer stagnation cover (3).
Compared with the prior art, the platinum resistor and the double-layer stagnation cover are adopted, so that the accuracy of the sensor is effectively improved, the speed error, the heat conduction error and the radiation error are reduced, and the total temperature measurement accuracy is higher; a plurality of air inlet grooves are formed in inlets of the inner stagnation cover and the outer stagnation cover, the air flow insensitive angle range of the total temperature probe is effectively widened, and the total temperature recovery coefficient can be kept stable basically in a larger air flow angle range.
Drawings
FIG. 1 is a side view of an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a face of the outlet hole at the centerline according to an embodiment of the present invention.
Fig. 3 is a top view of an embodiment of the present invention.
Fig. 4 is a front view of an embodiment of the present invention.
Reference numbers and corresponding part names in the figures: 1-platinum resistance; 2-inner layer stagnation cover; 3-outer stagnation cover; 4-inner layer stagnation cover air inlet groove; 5-outer layer stagnation cover air inlet groove; 6-a connecting segment; and 7, air outlet holes.
Detailed Description
Aiming at the defects in the prior art, the core object of the invention is to provide a head part of a total temperature probe 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 head part of the conventional total temperature probe.
The head of a suspended double-stagnation-cover total temperature probe based on a platinum resistor is described in detail by combining the attached drawings of the specification.
Fig. 1, fig. 2, fig. 3 and fig. 4 are schematic structural views of an embodiment of the invention, and a suspended double stagnation cover total temperature probe head based on a platinum resistor is characterized by comprising a platinum resistor (1), an inner stagnation cover (2) and an outer stagnation cover (3); the platinum resistor (1) is used as a temperature sensing element of the total temperature probe, and the armored or naked type can be selected according to the specific environment; an inlet of the inner stagnation cover (2) is provided with an air inlet groove (4), and an inlet of the outer 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, an air outlet (6) is formed in the center, and air flow entering the inner layer stagnation cover flows out from the air outlet.
Preferably, the outer diameter of the outer stagnation cover (3) is 3/4 of the length of the outer stagnation cover, and the wall thickness of the outer stagnation cover (3) is 1/12 of the outer diameter of the outer stagnation cover.
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 arranged in the circumferential direction is 4.
Preferably, the length of the inner stagnation cover (2) is 11/16 of the length of the outer stagnation cover (3), the outer diameter of the inner stagnation cover (2) is 2/3 of the outer diameter of the outer stagnation cover (3), and the wall thickness of the inner stagnation cover (2) is 1/8 of the outer diameter of the inner stagnation cover.
Preferably, the length of the air inlet grooves (4) of the stagnation cover at the inner layer is 3/11 of the length of the stagnation cover at the inner layer, the width of the air inlet grooves (4) of the stagnation cover at the inner layer is 1/2 of the wall thickness of the stagnation cover at the inner layer (2), and the number of the air inlet grooves (4) of the stagnation cover at the inner layer is 4.
Preferably, the distance between the axis of the connecting section (7) and the bottom surface of the inner stagnation cover (2) is 3/11 of the length of the inner stagnation cover (2), the diameter of the connecting section (7) is 3/11 of the length of the inner stagnation cover (2), and the upper end and the lower end of the connecting section (7) are respectively inserted into connecting holes which are punched in advance in the outer stagnation cover (3) and the inner stagnation cover (2) and are fixed through welding.
Preferably, the diameter of the air outlet (6) is 2/3 of that of the connecting section (7), the length of the platinum resistor (1) extending into the stagnation cover is 5/8 of that of the stagnation cover on the outer layer, and the diameter of the platinum resistor (1) is 1/4 of the outer diameter of the stagnation cover on the outer layer (3).
The head of the total temperature probe can be conveniently processed and installed by adopting the hanging double-layer stagnation cover.
By adopting the 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 accuracy of the sensor can be improved, the heat conduction error and the radiation error are effectively reduced, and the measurement accuracy of the total temperature is higher.
A plurality of air inlet grooves are formed in the inlets of the inner stagnation cover and the outer stagnation cover, 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 preferred embodiments have been described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. It is understood, therefore, that the present invention has been described by way of illustration and not limitation.
Claims (1)
1. The utility model provides a two stagnant cover total temperature probe heads of suspension type based on platinum resistance which characterized in that: the resistor is composed of a platinum resistor (1), an inner layer stagnation cover (2) and an outer layer stagnation cover (3); the platinum resistor (1) is used as a temperature sensing element of the total temperature probe, and the armored or naked 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, an air outlet hole (6) is formed in the center, and air flow entering the inner layer stagnation cover flows out from the air outlet hole;
the outer diameter of the outer layer stagnation cover (3) at the head part of the suspension type double stagnation cover total temperature probe based on the platinum resistor is 23/32 to 25/32 of the length of the probe, and the wall thickness of the outer layer stagnation cover (3) is 1/16 to 5/48 of the outer diameter of the probe;
the length of an air inlet groove (5) of an outer layer stagnation cover at 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 air inlet groove (5) of the outer layer stagnation cover is 1/2 to 1 time of the wall thickness of the outer layer stagnation cover (3), and the number of the air inlet grooves (5) of the outer layer stagnation cover is 2 to 8;
the length of an inner layer stagnation cover (2) at the head part of the hanging type double stagnation cover total temperature probe based on the platinum resistor is 21/32 to 23/32 of the length of an 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 of the inner layer stagnation cover;
the length of an air inlet groove (4) of an inner layer stagnation cover of the head of the suspended 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 air inlet groove (4) of the inner layer stagnation cover is 1/2 to 1 time of the wall thickness of the inner layer stagnation cover (2), and the number of the air inlet grooves (4) of the inner layer stagnation cover is 2 to 8;
the distance between the axis of the connecting section (7) of the head part of the hanging type double stagnation cover total temperature probe based on the platinum resistor and the bottom surface of the inner stagnation cover (2) is 5/22 to 7/22 of the length of the inner stagnation cover (2), the diameter of the connecting section (7) is 5/22 to 7/22 of the length of the inner stagnation cover (2), and the upper end and the lower end of the connecting section (7) are respectively inserted into connecting holes which are punched in advance in the outer stagnation cover (3) and the inner stagnation cover (2) and are fixed by welding;
the diameter of an air outlet hole (6) at the head part 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 a connecting section (7), the length of the platinum resistor (1) extending into the stagnation cover is 19/32 to 21/32 of the length (3) of the outer stagnation cover, and the diameter of the 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 a 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 in the outer stagnation cover through a connecting section, so that the processing and the installation are convenient; the airflow in the inner stagnation chamber is subjected to first stagnation near the top of the sensor, exchanges heat with the sensor, flows out of the air outlet hole in the connecting section at the root part of the inner stagnation cover, is subjected to second stagnation, and is remarkably reduced in speed after twice stagnation, so that the total temperature recovery characteristic is good; the outer layer airflow flows into the outer layer stagnation cover, so that the root of the sensor and the wall surface of the inner layer stagnation cover can be fully heated, and heat conduction and radiation errors are reduced; a plurality of air inlet grooves are uniformly formed in the inlets of the inner stagnation cover and the outer stagnation cover along the circumferential direction, so that the insensitive angle range of total temperature measurement can be effectively widened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210894804.5A CN115435913A (en) | 2022-07-28 | 2022-07-28 | Suspension type double stagnation cover total temperature probe head based on platinum resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210894804.5A CN115435913A (en) | 2022-07-28 | 2022-07-28 | Suspension type double stagnation cover total temperature probe head based on platinum resistor |
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| Publication Number | Publication Date |
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| CN115435913A true CN115435913A (en) | 2022-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210894804.5A Pending CN115435913A (en) | 2022-07-28 | 2022-07-28 | Suspension type double stagnation cover total temperature probe head based on platinum resistor |
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| CN (1) | CN115435913A (en) |
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2022
- 2022-07-28 CN CN202210894804.5A patent/CN115435913A/en active Pending
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