Temperature rise environment temperature sensor group calibration device

Abstract

The invention discloses a temperature rise environment temperature sensor group calibration device which comprises a first-stage heating section, a first-stage rectification section, a first-stage stable test section, a second-stage heating section, a second-stage rectification section, a second-stage stable section, a second-stage contraction section, a second-stage test section, a reference airflow temperature sensor group, a calibrated temperature sensor group, a total pressure probe and a static pressure probe. The reference airflow temperature sensor groups are respectively arranged in the first-stage stable test section and the second-stage stable test section, and the calibrated temperature sensor groups are respectively arranged in the first-stage stable test section and the second-stage stable test section; the total pressure probe is arranged in the second-stage stable section, and the static pressure probe is arranged in the second-stage test section; a temperature difference standard value between the first-stage stable test section and the second-stage stable test section is obtained through the reference temperature sensor group and is used for calibrating the temperature sensor group in the temperature rise environment. According to the invention, accurate calibration of the temperature rise environment temperature sensor group can be realized, and the problem that the influence of the airflow velocity error on the reference temperature measurement in the temperature measurement deviation calibration of the existing airflow temperature sensor is large is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of airflow temperature measurement, and in particular relates to a temperature rise environment temperature sensor group calibration device. Background Art

[0002] In the process of aircraft engine development, in order to accurately measure the inlet and outlet temperature difference of compressor components, it is necessary to calibrate the temperature sensor group that measures the temperature rise, thereby improving the accuracy of the temperature difference measurement. At present, according to the "JJF (Military Industry) 73-2014 Airflow Temperature Sensor Steady-State Calibration Specification", the airflow temperature sensor can be calibrated for temperature measurement deviation, and the reference temperature sensor and the calibrated temperature sensor are placed in the test section of the wind tunnel, and the temperature measurement deviation is calibrated by the comparison method. However, when the reference temperature sensor is measured in the test section, it will still be affected by the speed error, and the uncertainty component introduced by the speed error is large. During the use of the calibrated sensor, in order to reduce the error introduced by the individual differences of the thermocouple sensor, the reverse series method is often used to directly measure the temperature difference. The existing temperature measurement deviation calibration method cannot calibrate the thermocouple sensor group measurement of the reverse series method. Therefore, it is necessary to study a new calibration device for the calibration of the temperature rise ambient temperature sensor group. Summary of the invention

[0003] The purpose of the present invention is to provide a temperature rise environment temperature sensor group calibration device, which can realize accurate calibration of the temperature rise environment temperature sensor group and solve the problem that the speed error has a great influence on the reference temperature measurement in the existing airflow temperature sensor temperature measurement deviation calibration.

[0004] In order to achieve the above-mentioned object, one aspect of the present invention provides a temperature rise environment temperature sensor group calibration device, comprising a primary heating section, a primary rectifying section, a primary stable test section, a secondary heating section, a secondary rectifying section, a secondary stable section, a secondary contraction section, a secondary test section, a reference airflow temperature sensor group, a calibrated temperature sensor group, a total pressure probe and a static pressure probe, wherein the primary heating section, the primary rectifying section, the primary stable test section, the secondary heating section, the secondary rectifying section, the secondary stable section, the secondary contraction section and the secondary test section are sequentially connected to form a wind tunnel;

[0005] The primary heating section and the secondary heating section are used to heat the airflow. The outer walls of the primary rectifying section, the primary stable test section, the secondary rectifying section, and the secondary stable section are provided with a temperature control and heating structure for heating and a temperature measuring element for monitoring the wall surface temperature. The temperature control and heating structure is wrapped with a thermal insulation layer, and the outer walls of the secondary contraction section and the secondary test section are wrapped with a thermal insulation layer.

[0006] The reference airflow temperature sensor group includes a first reference temperature sensor and a second reference temperature sensor, which are respectively arranged in the primary stable test section and the secondary stable section. By collecting the temperature value of the first reference temperature sensor to control and adjust the temperature control heating structure, the wall temperature of the primary rectifying section and the primary stable test section can be kept consistent with the airflow temperature therein. By collecting the temperature value of the second reference temperature sensor to control and adjust the temperature control heating structure, the wall temperature of the secondary rectifying section and the secondary stable section can be kept consistent with the airflow temperature therein. The calibrated temperature sensor group includes a first calibrated temperature sensor and a second calibrated temperature sensor, which are respectively arranged in the primary stable test section and the secondary test section.

[0007] The secondary contraction section is used to accelerate the airflow. The total pressure probe is installed in the primary stable test section, the secondary stable section or the secondary test section to measure the total pressure of the airflow. The static pressure probe is installed in the secondary test section to measure the static pressure of the airflow. The Mach number of the airflow in the secondary test section can be calculated based on the measurement results of the total pressure and static pressure.

[0008] Preferably, the reference temperature values ​​measured by the reference temperature sensor group are T 01 and T 02 The calibrated temperature sensor group measures the air flow temperature value T j1 and T j2 , then the calibration value of the temperature difference is: ΔT = T 01 -T 02 -(T j1 -T j2 ).

[0009] Preferably, the reference temperature sensor group is a thermocouple temperature sensor connected by a reverse series method, which can collect the temperature difference between the airflow in the primary stable test section and the secondary stable section.

[0010] Preferably, the reference temperature sensor is a standard platinum resistance sensor, which can measure reference temperature values ​​before and after a temperature rise environment.

[0011] Preferably, the temperature control heating structure is a heating belt, a heating plate, a heating cloth or a heating pad, the temperature measuring element is a platinum resistor, a thermocouple or a wall temperature sensor, and the insulation layer is an alumina fiber blanket insulation layer.

[0012] Preferably, the primary heating section, primary rectifying section, primary stability test section, secondary heating section, secondary rectifying section, secondary stability section, secondary contraction section, and secondary test section are all steel thin-walled cylinders, which are connected in sequence by flanges.

[0013] Preferably, the primary rectifying section and the secondary rectifying section adopt a combination of a honeycomb and a damping net for rectification.

[0014] Preferably, the temperature control and heating structure adopts platinum resistance temperature control, and the temperature control accuracy is less than 0.1°C.

[0015] Preferably, the primary heating section and the secondary heating section are heated by electric heaters.

[0016] The temperature rise environment temperature sensor group calibration device according to the above aspects of the present invention can realize accurate calibration of the temperature rise environment temperature sensor group, and solve the problem that the airflow velocity error has a great influence on the reference temperature measurement in the existing airflow temperature sensor temperature measurement deviation calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0018] Figure 1 It is a structural schematic diagram of a temperature rise environment temperature sensor group calibration device according to an embodiment of the present invention.

[0019] In the figure: 1-primary heating section 2-primary rectifying section 3-primary stable test section 4-secondary heating section 5-secondary rectifying section 6-secondary stable section 7-secondary contraction section 8-secondary test section 9-heater 10-temperature control and heating structure 11-first reference temperature sensor 12-first calibrated temperature sensor 13-second reference temperature sensor 14-total pressure probe 15-second calibrated temperature sensor 16-static pressure probe 17-insulation layer. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] An embodiment of the present invention provides a temperature rise environment temperature sensor group calibration device, such as Figure 1As shown, the temperature rise environment temperature sensor group calibration device of the embodiment of the present invention includes a primary heating section 1, a primary rectifying section 2, a primary stable test section 3, a secondary heating section 4, a secondary rectifying section 5, a secondary stable section 6, a secondary contraction section 7, a secondary test section 8, a reference airflow temperature sensor group, a calibrated temperature sensor group, a total pressure probe 14 and a static pressure probe 16. The primary heating section 1, the primary rectifying section 2, the primary stable test section 3, the secondary heating section 4, the secondary rectifying section 5, the secondary stable section 6, the secondary contraction section 7, and the secondary test section 8 are sequentially connected to form a wind tunnel.

[0022] The primary heating section 1, the primary rectifying section 2, the primary stable test section 3, the secondary heating section 4, the secondary rectifying section 5, the secondary stable section 6, the secondary contraction section 7, and the secondary test section 8 are all steel thin-walled cylinders connected by flanges. The primary rectifying section 2 and the secondary rectifying section 5 use a combination of honeycombs and damping nets for rectification. After rectification, the airflow forms a uniform and stable temperature field and velocity field in the primary stable test section 3 and the secondary stable section 6.

[0023] The primary heating section 1 and the secondary heating section 4 are used to heat the airflow, and both can be heated by electric heaters. The primary rectifying section 2, the primary stable test section 3, the secondary rectifying section 5, and the secondary stable section 6 are provided with a temperature control heating structure 10 and a temperature measuring element on the outer wall. The temperature control heating structure 10 is used for heating, and the temperature measuring element is used for monitoring the wall temperature. The temperature control heating structure 10 is wrapped with an insulation layer 17, and the secondary contraction section 7 and the secondary test section 8 are only wrapped with the insulation layer 17. By insulating the secondary contraction section 7 and the secondary test section 8, the temperature loss caused by heat dissipation is reduced, and the impact on the airflow temperature is reduced.

[0024] In one embodiment, the temperature control and heating structure 10 can be a heating belt, which is wrapped around the outer wall of the primary rectifying section 2, the primary stable test section 3, the secondary rectifying section 5, and the secondary stable section 6. The temperature control and heating structure 10 can also be in the form of a heating sheet, a heating cloth, a heating pad, etc. The temperature control and heating structure 10 uses a platinum resistor for temperature control, and the temperature control accuracy is less than 0.1°C. The temperature measuring element can be a platinum resistor, a thermocouple, a wall temperature sensor, etc. The insulation layer 17 is an alumina fiber blanket insulation layer, which is wrapped around the outside of the temperature control and heating structure 10 and the outer wall of the secondary contraction section 7 and the secondary test section 8.

[0025] The reference airflow temperature sensor group includes a first reference temperature sensor 11 and a second reference temperature sensor 13, which are respectively placed in the primary stable test section 3 and the secondary stable test section 6, and are used to obtain the standard value of the temperature difference between the primary stable test section 3 and the secondary test section 8, and are used to calibrate the temperature sensor group working in a temperature rise environment. The calibrated temperature sensor group includes a first calibrated temperature sensor 12 and a second calibrated temperature sensor 15, which are respectively placed in the primary stable test section 3 and the secondary test section 8.

[0026] In one embodiment, a second-class platinum resistor is used as the first reference temperature sensor 11 in the primary stable test section 3 to measure the inlet temperature of the airflow. By collecting the temperature value of the airflow in the primary stable test section 3 (the temperature value of the first reference temperature sensor 11), the temperature control and heating structure 10 is controlled and adjusted to keep the wall temperature of the primary rectifying section 2 and the primary stable test section 3 consistent with the airflow temperature therein. A second-class platinum resistor is used as the second reference temperature sensor 13 in the secondary stable section 6 to measure the outlet temperature of the airflow. By collecting the temperature value of the airflow in the secondary stable section 6 (the temperature value of the second reference temperature sensor 13), the temperature control and heating structure 10 is controlled and adjusted to keep the wall temperature of the secondary rectifying section 5 and the secondary stable section 6 consistent with the airflow temperature therein.

[0027] The first reference temperature sensor 11 and the second reference temperature sensor 13 can be thermocouples, which are connected in reverse series and can directly measure the temperature difference, or they can be platinum resistors, which use standard platinum resistors to measure the reference temperature values ​​before and after the temperature rise environment.

[0028] The secondary contraction section 7 accelerates the airflow to the Mach number required for calibration of the secondary test section 8 by reducing the flow area. The total pressure probe 14 is installed in the secondary stable section 6 to measure the total pressure of the airflow. The position of the total pressure probe 14 can be swapped to the primary stable test section 3 or the secondary test section 8. The static pressure probe 16 is installed in the secondary test section 8 to measure the static pressure of the test section. The Mach number of the airflow in the secondary test section 8 can be calculated based on the total pressure and static pressure results.

[0029] In the calibrated temperature sensor group, the first calibrated temperature sensor 12 is installed as the inlet temperature sensor in the primary stable test section 3, and the second calibrated temperature sensor 15 is installed as the outlet temperature sensor in the secondary test section 8. The reference temperature sensor group measures the reference temperature values ​​T 01 and T 02 The calibrated temperature sensor groups measure the air flow temperature values ​​as T j1 and T j2 , then the calibration value of the temperature difference is: ΔT = T 01 -T 02 -(T j1 -T j2 ).

[0030] The working process of the temperature rise environment temperature sensor group calibration device of the embodiment of the present invention is as follows:

[0031] The airflow flows through the primary heating section 1, the primary rectifying section 2, the primary stable test section 3, the secondary heating section 4, the secondary rectifying section 5, the secondary stable section 6, the secondary contraction section 7, and the secondary test section 8 in sequence; the primary heating section 1 is controlled to heat the airflow to the inlet temperature required for calibration. After the airflow passes through the primary rectifying section 2, the first reference temperature sensor 11 located in the primary stable test section 3 measures the inlet airflow temperature. The primary temperature control and heating structure 10 controls the heating of the outer wall according to the inlet airflow temperature to reduce the temperature gradient of the airflow, thereby reducing heat loss and forming a uniform and stable temperature field and velocity field in the primary stable test section 3; the airflow passes through After passing through the secondary heating section 4, the secondary heating section 4 is controlled to heat the airflow to the outlet temperature required for calibration. After the airflow passes through the secondary rectifying section 5, the outlet airflow temperature is measured by the second reference temperature sensor 13 located in the secondary stabilizing section 6. The secondary temperature control and heating structure 10 controls the heating of the outer wall according to the outlet airflow temperature to form a uniform and stable temperature field and velocity field in the secondary stabilizing section 6. After being accelerated through the secondary contraction section 7, the Mach number required for calibration is obtained in the secondary test section 8. The airflow Mach number of the secondary test section 8 can be calculated through the measurement results of the total pressure probe 14 of the secondary stabilizing section 6 and the static pressure probe 16 of the secondary test section 8.

[0032] To sum up, the temperature rise ambient temperature sensor group calibration device of the embodiment of the present invention aims at the problem that the speed error in the existing airflow temperature sensor temperature measurement deviation calibration has a great influence on the reference temperature measurement and the problem that the reverse-series thermocouple sensor group used for temperature difference measurement cannot be calibrated. A temperature rise ambient temperature sensor group calibration device is provided, which can effectively reduce the influence of the speed error on the reference temperature and can calibrate the reverse-series thermocouple sensor group used for temperature difference measurement.

[0033] Compared with the prior art, the temperature rise environment temperature sensor group calibration device of the embodiment of the present invention has the following beneficial effects:

[0034] 1. The present invention places the reference temperature sensor group in a stable section where the air flow velocity is low, thereby reducing the influence of the velocity on the temperature measured by the reference temperature sensor; performs temperature-controlled heating on the secondary rectifying section 5 and the secondary stabilizing section 6 to reduce the influence of radiation and heat conduction on the temperature measured by the reference temperature sensor; and performs heat preservation on the secondary contraction section 7 and the secondary test section 8 to reduce the influence of heat dissipation on the reference temperature, thereby improving the measurement accuracy of the reference temperature.

[0035] 2. The present invention sets two test sections in a wind tunnel. Under the premise that the airflow temperature in the secondary test section 8 is higher than the airflow temperature in the primary stable test section 3, the two test measurement areas can be temperature-controlled separately, thereby realizing calibration of the reverse-series thermocouple sensor group used for temperature difference measurement.

[0036] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A temperature rise environment temperature sensor group calibration device, characterized in that: It includes a primary heating section, a primary rectifying section, a primary stable test section, a secondary heating section, a secondary rectifying section, a secondary stable section, a secondary contraction section, a secondary test section, a reference airflow temperature sensor group, a calibrated temperature sensor group, a total pressure probe and a static pressure probe, wherein the primary heating section, the primary rectifying section, the primary stable test section, the secondary heating section, the secondary rectifying section, the secondary stable section, the secondary contraction section and the secondary test section are sequentially connected to form a wind tunnel; The primary heating section and the secondary heating section are used to heat the airflow. The outer walls of the primary rectifying section, the primary stable test section, the secondary rectifying section, and the secondary stable section are provided with a temperature control and heating structure for heating and a temperature measuring element for monitoring the wall surface temperature. The temperature control and heating structure is wrapped with a thermal insulation layer, and the outer walls of the secondary contraction section and the secondary test section are wrapped with a thermal insulation layer. The reference airflow temperature sensor group includes a first reference temperature sensor and a second reference temperature sensor, which are respectively arranged in the primary stable test section and the secondary stable section. By collecting the temperature value of the first reference temperature sensor to control and adjust the temperature control heating structure, the wall temperature of the primary rectifying section and the primary stable test section can be kept consistent with the airflow temperature therein. By collecting the temperature value of the second reference temperature sensor to control and adjust the temperature control heating structure, the wall temperature of the secondary rectifying section and the secondary stable section can be kept consistent with the airflow temperature therein. The calibrated temperature sensor group includes a first calibrated temperature sensor and a second calibrated temperature sensor, which are respectively arranged in the primary stable test section and the secondary test section. The secondary contraction section is used to accelerate the airflow. The total pressure probe is installed in the primary stable test section, the secondary stable section or the secondary test section to measure the total pressure of the airflow. The static pressure probe is installed in the secondary test section to measure the static pressure of the airflow. The Mach number of the airflow in the secondary test section can be calculated based on the measurement results of the total pressure and static pressure.

2. The device according to claim 1, characterized in that The reference temperature sensor group respectively measures the reference temperature T 01 and T 02 The calibrated temperature sensor group measures the air flow temperature value T j1 and T j2 , then the calibration value of the temperature difference is: ΔT = T 01 -T 02 -(T j1 -T j2 ).

3. The device according to claim 1 or 2, characterized in that The reference temperature sensor group is a thermocouple temperature sensor connected by a reverse series method, and can collect the temperature difference between the airflow in the primary stable test section and the secondary stable section.

4. The device according to claim 1 or 2, characterized in that The reference temperature sensor is a standard platinum resistor, which can measure reference temperature values ​​before and after the temperature rise environment.

5. The device according to claim 1 or 2, characterized in that The temperature control heating structure is a heating belt, a heating sheet, a heating cloth or a heating pad, the temperature measuring element is a platinum resistor, a thermocouple or a wall temperature sensor, and the insulation layer is an alumina fiber blanket insulation layer.

6. The device according to claim 1 or 2, characterized in that: The primary heating section, primary rectifying section, primary stable test section, secondary heating section, secondary rectifying section, secondary stable section, secondary contraction section, and secondary test section are all steel thin-walled cylinders, which are connected in sequence through flanges.

7. The device according to claim 1 or 2, characterized in that The primary rectifying section and the secondary rectifying section adopt a combination of honeycomb and damping net for rectification.

8. The device according to claim 1 or 2, characterized in that The temperature control heating structure adopts platinum resistance temperature control, and the temperature control accuracy is less than 0.1℃.

9. The device according to claim 1 or 2, characterized in that: The primary heating section and the secondary heating section are heated by electric heaters.

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