CN105890804B - A method of it improving temperature sensor and measures total airflow temperature precision - Google Patents
A method of it improving temperature sensor and measures total airflow temperature precision Download PDFInfo
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- CN105890804B CN105890804B CN201610214774.3A CN201610214774A CN105890804B CN 105890804 B CN105890804 B CN 105890804B CN 201610214774 A CN201610214774 A CN 201610214774A CN 105890804 B CN105890804 B CN 105890804B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
- G01K13/024—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow of moving gases
Abstract
The invention discloses a kind of methods of raising temperature sensor measurement total airflow temperature precision.In the test such as engine, turbine, total airflow temperature generally is measured using temperature sensors such as thermocouple, thermal resistance, total temperature comb, total temperature rakes.The temperature data that these pick-ups measure at present generally ignores error caused by three-dimensional air velocity, it is believed that is exactly the total airflow temperature of measured point, be easy to cause larger measurement error.A kind of method for improving temperature sensor measurement total airflow temperature precision of invention, it proposes that total temperature is experienced to be associated between coefficient and gasflow mach number, deflection angle, pitch angle, its mapping relations is established by calibration experiments, using calibration data and related information of flow, the temperature data that pick-up can be measured converses total airflow temperature.This method can reduce the three-dimensional velocity error of temperature sensor measurement total airflow temperature, effectively improve the precision of temperature sensor measurement total airflow temperature.
Description
Technical field
The present invention relates to use contact temperature pick-ups, such as use the temperature probe of thermocouple, thermal resistance sensor,
The technical field of total airflow temperature is measured, in particular to a kind of reduction three-dimensional velocity error, raising temperature sensor measurement air-flow are total
The method of warm precision.
Background technique
When air-flow is around leaching material flows in the gas flow, the so-called critical point of face incoming flow on object, due to air-flow
Stagnation effect, air velocity be equal to zero, just reach maximum value in the temperature of this point, this temperature is exactly total temperature, is called stagnant
Only temperature.In steady flow, total temperature variation can be used to measure heat or function transfer.
Total airflow temperature is generally measured using contact temperature pick-up in engineering at present, including single-point total temperature pick-up, more
Point total temperature pick-up, such as single-point thermocouple total temperature probe, total temperature comb, total temperature rake.
In fact, temperature sensor has certain bulk, such as the ball head at thermocouple measurement end, only just
To on the stagnation point of incoming flow, the temperature of the total temperature for being only air-flow of impression, other positions impression of pick-up is below total temperature, i.e.,
Make pick-up head install additional stagnation cover, due in order to allow pick-up experience fresh incoming flow total temperature, reduce conduction error, stagnation
It is provided with discharge orifice on cover downstream wall surface, pick-up head still has certain speed, and there is no complete stagnation to get off for air-flow,
In this way, the temperature that temperature sensor measures actually is lower than total temperature, and related with flow-deviation angle, pitch angle and Mach number.
Current measurement method and technology, it is considered that the temperature data that above-mentioned temperature sensor measures is exactly the total temperature for being measured point,
Even if being modified, also only carried out the amendment of one-dimensional speed, had ignored error caused by three-dimensional air velocity, be easy to cause compared with
Big measurement error especially changes violent operating condition in speed of incoming flow height, direction of flow.
A kind of method for improving temperature sensor measurement total airflow temperature precision of invention, proposes that total temperature experiences coefficient
It is associated between gasflow mach number, flow-deviation angle, air-flow pitch angle, establishes its mapping relations by calibration experiments, utilize school
Quasi- data and related information of flow, the data reduction that pick-up can be measured go out total airflow temperature.It can reduce in this way
Pick-up measures the velocity error of total temperature, effectively improves the precision of temperature sensor measurement total airflow temperature.
Summary of the invention
The present invention solves the technical problem of: invent a kind of raising temperature sensor measurement total airflow temperature precision
Method can be reduced the three-dimensional velocity error of pick-up measurement total airflow temperature, and it is total to can effectively improve temperature sensor measurement air-flow
The precision of temperature.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: introduce the total temperature impression system of temperature sensor
Several definition experiences coefficient gamma and gasflow mach number M, flow-deviation angle first with the total temperature that calibration experiments obtain temperature sensor
Corresponding relationship between α, air-flow pitch angle β;Again in actual measurement, according to the gasflow mach number of measured point, flow-deviation angle,
Air-flow pitch angle experiences coefficient by the total temperature that calibration data obtains temperature sensor, and the definition for recycling total temperature to experience coefficient is done
Pick-up can be surveyed the temperature data T that flow field obtains by data processing by indentily transformationpConverse total airflow temperature T0。
Compared with prior art, following technical effect can achieve using method of the invention:
1. the present invention points out that the total temperature of temperature sensor is experienced coefficient and not only influenced by Mach number, flow-deviation angle, also by
Air-flow pitch angle influence, propose total temperature experience coefficient simultaneously with Mach number, flow-deviation angle, air-flow pitching angular correlation, it is contemplated that
Three-dimensional velocity influences the error of temperature sensor measurement total temperature, and proposes modification method.
2. existing temperature sensor measures total airflow temperature, velocity error amendment is seldom carried out, the velocity error of progress is repaired
Just only considered one-dimensional speed influences, and does not recognize that flow-deviation angle, pitch angle variation also bring along temperature sensor speed
The variation of error does not carry out the three-dimensional velocity error correction influenced comprising flow-deviation angle, pitch angle.
3. the present invention can effectively reduce the three-dimensional velocity error of temperature sensor measurement total airflow temperature, temperature is greatly improved
The precision of pick-up measurement total airflow temperature.
Detailed description of the invention
Fig. 1 is air-flow pitch angle β, angle of deflection definition, the relativeness with temperature sensor.
Fig. 2 is the thermocouple schematic diagram with stagnation cover.
Fig. 3 is calibration wind tunnel experimental system schematic diagram, by calibration experiments, can obtain the total temperature impression of temperature sensor
Coefficient.Calibration wind tunnel experimental system (contains 3 pressurizer tanks, contraction section, 7 in fact including 1 valve, 2 centrifugal blowers (gas source), calibration wind tunnel
Test section etc.), measurement 4 total pressure probes of incoming flow, 5 total temperature probes, 6 static probes, 8 displacement mechanisms, 9 passed to school probe, 10 pressure
Sensor, 11 temperature transmitters, 14 atmospheric pressure meters, 12 data actuations, 13 computer systems.
Fig. 4, Fig. 5 be respectively certain temperature sensor total temperature in M=0.5, M=0.8 experience coefficient and flow-deviation angle and
The association of pitch angle is to test actual measurement by calibration wind tunnel to obtain, it can be seen that different Mach number, different air-flows are inclined
In the case of corner, different air-flow pitch angle incoming flows, the total temperature of the temperature sensor experiences factor v difference.
Specific embodiment
1, the total temperature for introducing temperature sensor experiences the definition of coefficient:
Or its indentily transformation, such as
K is specific heats of gases ratio, psFor air-flow static pressure, p0For air-flow stagnation pressure, TpThe temperature measured for pick-up.
2, using calibration experiments, the total temperature for obtaining temperature sensor experiences coefficient gamma and gasflow mach number M, flow-deviation angle
Corresponding relationship between α, air-flow pitch angle β.
It can use calibration wind tunnel experimental system as shown in the figure coefficient experienced to temperature sensor total temperature and calibrate.School
Quasi- wind tunnel experiment system includes centrifugal blower (gas source), calibration wind tunnel (containing pressurizer tank, contraction section, experimental section etc.), measurement incoming flow
Total pressure probe, total temperature probe, static probe, displacement mechanism, pressure sensor, temperature transmitter, atmospheric pressure meter, computer
Data collection system.
The total temperature and stagnation pressure of measurement air-flow are exported in wind-tunnel pressurizer tank, it is quiet to measure to be provided with static pressure hole in experimental section wall surface
Pressure.
Wind tunnel experiment section is located in by displacement mechanism by school temperature sensor, deflection angle between pick-up and air-flow and
Pitch angle can be changed, measurement by displacement mechanism, can change the Mach number of incoming flow by adjusting gas source operating condition.
At each mach number, change pitch angle, such as -20 °~+20 °, be spaced 10 °;In each pitch angle position
Set, change deflection angle, such as -30 °~+30 °, be spaced 10 °, measure respectively total airflow temperature, stagnation pressure, static pressure, Mach number, by school temperature
Temperature sensor is calculated under different Mach number, different pitch angles, different deflection angles in the measured temperature for spending pick-up
Total temperature experiences coefficient, and is associated.
Fig. 3 is that certain temperature sensor total temperature in M=0.5 experiences being associated with for coefficient and flow-deviation angle and pitch angle, Fig. 4
For certain temperature sensor, in M=0.8, total temperature experiences being associated with for coefficient and flow-deviation angle and pitch angle.
3, after the completion of actual measurement, according to the gasflow mach number of measured point, flow-deviation angle, air-flow pitch angle, by upper
Calibration associated data is stated, for example, certain temperature sensor is in M=0.5, -10 ° of flow-deviation angle, 20 ° of air-flow pitch angle, it is known that,
It is 0.46 that total temperature, which experiences coefficient,.
4, indentily transformation is done in the definition for recycling total temperature to experience coefficient, pick-up can be surveyed flow field by data processing and obtained
The temperature data T arrivedpConverse total airflow temperature T0。
Claims (4)
1. a kind of method for improving temperature sensor measurement total airflow temperature precision, proposes that the total temperature of temperature sensor experiences coefficient gamma
It is associated between gasflow mach number M, flow-deviation angle α, air-flow pitch angle β;It tests first with calibration wind tunnel to temperature sensor
It is calibrated, is tested by calibration wind tunnel and obtain the temperature sensor in incoming flow difference gasflow mach number M, different flow-deviation angles
Total temperature under α, different air-flow pitch angle β experiences coefficient gamma, i.e. the total temperature of acquisition temperature sensor experiences coefficient gamma and air-flow horse
Conspicuous several M, flow-deviation angle α, the corresponding relationship between air-flow pitch angle β;Again in temperature sensor actual measurement, according to tested
Gasflow mach number M, the flow-deviation angle α, air-flow pitch angle β of point, by the total temperature for the temperature sensor that calibration wind tunnel experiment obtains
Experience coefficient gamma and gasflow mach number M, flow-deviation angle α, the corresponding relationship between air-flow pitch angle β, obtains the temperature and felt
The total temperature of device in the case experiences coefficient gamma, and indentily transformation is done in the definition for recycling total temperature to experience coefficient gamma, at data
The temperature data T that reason obtains temperature sensor actual measurement flow fieldpConverse the total temperature T of the air-flow0。
2. a kind of method for improving temperature sensor measurement total airflow temperature precision according to claim 1, temperature sensor
Total temperature experience coefficient gamma definition be:
Or its indentily transformation, such as
K is specific heats of gases ratio, psFor air-flow static pressure, p0For air-flow stagnation pressure, TpFor the temperature that pick-up measures, M is air-flow Mach
Number.
3. a kind of method for improving temperature sensor measurement total airflow temperature precision according to claim 1, it is characterized in that: suitable
With the measurement probe that range includes using thermocouple, thermal resistance temperature sensor.
4. a kind of method for improving temperature sensor measurement total airflow temperature precision according to claim 1, it is characterized in that: suitable
It include single point temperature pick-up, multi-point temperature pick-up, blade profile temperature detector probe, total temperature probe, thermometric rake, thermometric with range
Comb.
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CN106885681A (en) * | 2017-03-02 | 2017-06-23 | 北京航空航天大学 | A kind of monocline hole dynamic pressure probe for measuring rotor outlet subsonics three-dimensional flow field |
CN106885682A (en) * | 2017-03-06 | 2017-06-23 | 北京航空航天大学 | A kind of cylindrical type diplopore dynamic pressure probe for measuring rotor outlet subsonics three-dimensional flow |
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 |
CN107131974B (en) * | 2017-05-08 | 2019-08-23 | 北京航空航天大学 | A kind of temperature probe comb with air-breathing branching rod structure |
CN109186815B (en) * | 2018-10-31 | 2020-04-07 | 北京航空航天大学 | Probe temperature calibration device for low-temperature high-Mach number test |
CN111649848A (en) * | 2020-05-29 | 2020-09-11 | 西安联创分布式可再生能源研究院有限公司 | Temperature recovery coefficient determination method |
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CN102692278A (en) * | 2012-06-06 | 2012-09-26 | 中北大学 | Optical fiber total temperature sensor for high-speed airflow and temperature measurement system for optical fiber total temperature sensor |
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