CN114485996A - Alternating airflow temperature generating device based on supersonic jet element - Google Patents
Alternating airflow temperature generating device based on supersonic jet element Download PDFInfo
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- CN114485996A CN114485996A CN202111586227.5A CN202111586227A CN114485996A CN 114485996 A CN114485996 A CN 114485996A CN 202111586227 A CN202111586227 A CN 202111586227A CN 114485996 A CN114485996 A CN 114485996A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/002—Calibrated temperature sources, temperature standards therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
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- General Engineering & Computer Science (AREA)
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- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses an alternating airflow temperature generating device based on a supersonic jet element, and belongs to the field of dynamic temperature calibration. The invention comprises a supersonic jet element and a thermal calibration wind tunnel. The supersonic jet element comprises a main gas source, a control port, an output end and a three-position three-way electromagnetic control valve. The gas is divided into two parts through a pipeline, one part directly enters a main gas source inlet of the jet flow element, the other part controls two control ports of the jet flow element through a three-position three-way electromagnetic control valve, the quick switching of the main jet flow is realized by using the entrainment effect and the wall attachment effect of the jet flow and the control gas flow with small flow, the controllable cold gas flow changing according to the alternating rule is generated, and the high-temperature dynamic calibration of the gas flow temperature sensor is realized. The invention and the thermal calibration wind tunnel form a standard device for calibrating the dynamic performance of the high-temperature airflow temperature sensor. The invention has the advantages of simple structure, good stability, convenient control, easy realization and the like.
Description
Technical Field
The invention relates to an alternating airflow temperature generating device based on a supersonic jet element, and belongs to the field of dynamic temperature calibration.
Background
The dynamic performance indexes of the airflow temperature sensor are various, such as time constant, natural frequency, damping ratio and the like, at present, the dynamic characteristics of the airflow temperature sensor are mainly evaluated by adopting the time constant in China, and the time constant of the sensor is obtained by dynamically calibrating the airflow temperature sensor on a step-type dynamic temperature standard device. The time constant can reflect the lag time of the airflow temperature sensor, but dynamic errors, namely amplitude sensitivity errors, of the airflow temperature sensor caused by thermal lag cannot be given, so that the dynamic performance of the airflow temperature sensor cannot be comprehensively and accurately evaluated. In addition, many airflow temperature sensors are mounted downstream of the rotating components of the weapon model, and the measured airflow temperature is a periodically varying alternating signal. In order to ensure the accuracy and reliability of the alternating airflow temperature measurement result, an alternating dynamic temperature standard device needs to be developed to provide alternating dynamic temperature excitation for the airflow temperature sensor, simulate actual use conditions, dynamically calibrate the sensor, obtain the amplitude-frequency characteristic and the phase-frequency characteristic (including the inherent frequency and the damping ratio) of the sensor, and compensate and correct the measurement result of the airflow temperature sensor on the basis of the calibration result. In summary, in order to ensure the safety and control accuracy of the weapon model and improve the design level of the temperature sensor, an alternating dynamic airflow temperature standard device needs to be developed to calibrate the dynamic performance of the airflow temperature sensor.
The current dynamic airflow temperature standard devices established at home and abroad mainly comprise two types: one is a step type and the other is an alternating type. The device is relatively simple and easy to realize excitation, but the device cannot simulate the dynamic airflow temperature which changes periodically, in addition, the calibration result obtained by the method cannot give frequency domain information such as amplitude sensitivity error, phase error and the like of the temperature sensor, cannot comprehensively evaluate the dynamic performance of the temperature sensor, is inconvenient for compensating and correcting the alternating dynamic airflow temperature measurement result, and finally influences the accuracy of temperature measurement. The alternating air source is adopted to carry out dynamic calibration of the airflow temperature sensor, a rotating disc type alternating dynamic airflow temperature standard device is currently applied, a motor is used for driving a rotating disc to rotate at a high speed, cold airflow and hot airflow are alternately provided, and after the cold airflow and the hot airflow are mixed, alternating airflow temperature is formed around the calibrated sensor, so that frequency domain information of the dynamic characteristic of the temperature sensor can be obtained. However, the rotating disc type alternating airflow temperature generating device is large in size, the size and the frequency of generated cold airflow are not easy to control, and potential safety hazards are easily caused to field operators and instruments and equipment due to the high-speed rotation of the large-diameter disc.
The fluidic element is a fluidic control element which takes fluid as a working medium and has no moving part, controls and changes the fluid flow by utilizing the interaction of the fluid flow and some physical effects, realizes the functions of sensing, logic, amplification and the like, is also called as a fluidic amplifier abroad, and the internal jet of the fluidic control element has the characteristics of stable wall attachment and quick reversing. The supersonic jet element studied by the patent is one of compressible jet elements, can be used as a logic element of a control system to realize various logic functions, and can also be used as an execution component of the control system to directly generate large-energy driving force or torque through a small-energy control signal. The high-power high-voltage power-saving control system has good reliability, small volume and high power, can adapt to severe working environments such as radiation, corrosion, vibration, impact, high temperature and the like, and is successfully applied to certain control systems in the fields of aviation, aerospace, missiles and the like.
Disclosure of Invention
The invention discloses an alternating airflow temperature generating device based on a supersonic jet element, which aims to solve the technical problems that: an alternating cold airflow temperature signal with ideal amplitude and frequency periodically changing along with time is generated, and the alternating cold airflow temperature signal and the thermal calibration wind tunnel form a standard device for calibrating the dynamic performance of the high-temperature airflow temperature sensor. The invention has the advantages of simple structure, good stability, convenient control, easy realization and the like.
The purpose of the invention is realized by the following technical scheme.
The invention discloses an alternating airflow temperature generating device based on a supersonic jet element, which comprises the supersonic jet element and a thermal calibration wind tunnel, wherein the supersonic jet element is arranged in the supersonic jet element; the airflow passes through the supersonic speed jet element to generate cold airflow in a sine form, and the cold airflow is mixed with hot airflow generated by the thermal calibration wind tunnel at the outlet to form a high-temperature alternating hot airflow signal, so that the high-temperature dynamic calibration of the airflow temperature sensor is realized.
The high-temperature alternating hot airflow signal is an alternating cold airflow temperature signal with ideal amplitude and frequency periodically changing along with time.
The supersonic jet element comprises a main gas source, a control port, an output end and a three-position three-way electromagnetic control valve. The gas is divided into two parts through a pipeline, one part directly enters a main gas source inlet of the jet flow element, the other part controls two control ports of the jet flow element through a three-position three-way electromagnetic control valve, the quick switching of the main jet flow is realized by using small-flow control gas flow by utilizing the entrainment effect and the wall attachment effect of the jet flow, and controllable cold gas flow changing according to an alternating rule is generated.
The invention discloses an alternating airflow temperature generating device based on a supersonic jet element, which further comprises a throttle valve, wherein the throttle valve is arranged on a pipeline where a three-position three-way electromagnetic control valve is arranged, and the throttle valve is used for changing the flow of gas into micro flow.
The invention discloses an alternating airflow temperature generating device based on a supersonic jet element, which further comprises a pressure reducing valve, wherein the pressure reducing valve is connected with a high-pressure gas cylinder and is used for reducing the pressure of the high-pressure gas from the high-pressure gas cylinder to the required pressure and flow.
The invention discloses an alternating airflow temperature generating device based on a supersonic jet element, which further comprises a three-way diverter valve, wherein the three-way diverter valve divides the airflow which is diverted through a pressure reducing valve into two parts, the larger part serves as the air supply end of a main air source of the supersonic jet element, and the smaller part serves as the air supply end of a control port of the supersonic jet element.
The invention discloses an alternating airflow temperature generating device based on a supersonic jet element, which further comprises a sensor group, a data acquisition system 14 and a control system, wherein the sensor group mainly comprises a pressure sensor, a temperature sensor and a flow sensor which are used for measuring cold airflow after passing through a pressure reducing valve; the data acquisition system is used for acquiring voltage signals transmitted by the sensor group and carrying out denoising processing on the voltage signals. The control system is used for switching on and off and conversion of the valve group and acquisition and processing of data.
Advantageous effects
1. The invention discloses an alternating airflow temperature generating device based on a supersonic jet element, and belongs to alternating airflow temperature generating devices. Many temperature sensors are mounted downstream of the rotating parts of the weapon model, the measured temperature being a periodically varying alternating signal. In order to ensure the accuracy and reliability of the alternating airflow temperature measurement result, an alternating dynamic temperature standard device needs to be developed to provide alternating dynamic temperature excitation for the temperature sensor, simulate actual use conditions, dynamically calibrate the sensor, obtain the amplitude-frequency characteristics and the phase-frequency characteristics (including the inherent frequency and the damping ratio) of the sensor, and compensate and correct the measurement result of the temperature sensor on the basis of the calibration result.
2. The invention discloses an alternating airflow temperature generating device based on a supersonic jet element, which can be used as an alternating airflow temperature generating device based on a supersonic jet element, generates an alternating cold airflow temperature source with ideal amplitude and frequency changing periodically along with time, and forms a standard device for calibrating the dynamic performance of an airflow temperature sensor together with a thermal calibration wind tunnel.
3. The invention discloses an alternating airflow temperature generating device based on supersonic jet elements, which is characterized in that the supersonic jet elements are used as airflow control devices prominently, a three-position three-way electromagnetic control valve is used as a control valve for controlling the supersonic jet elements to be switched rapidly, alternating cold airflow signals with large amplitude and high frequency response can be generated, and the device is simple in structure, good in stability and easy to realize.
Drawings
FIG. 1 is a flow chart of the operation of an alternating airflow temperature generating device based on supersonic jet flow elements;
FIG. 2 is a structural diagram of an alternating air flow temperature generating device based on supersonic jet flow elements;
wherein: the device comprises a hot calibration wind tunnel 1, a pressure sensor 2, a temperature sensor 3, a gas collecting pipe 4, a pressure reducing valve 5, a cold air pressure sensor 6, a cold air temperature sensor 7, a flow meter 8, a three-way flow divider valve 9, a supersonic jet element 10 (a main gas source 10-1, a control port 10-2 and an output end 10-3), a throttle valve 11, a three-position three-way electromagnetic control valve 12, a high-pressure gas bottle group 13, a data acquisition system 14, a control system 15 and a calibrated sensor 16.
Detailed Description
For a better understanding of the objects and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1:
an alternating airflow temperature generating device based on a supersonic speed fluidic element is described by taking calibration of dynamic performance of an airflow temperature sensor as an example. The data acquisition and processing system is used for acquiring voltage signals transmitted by the sensor group and carrying out denoising processing on the voltage signals. The on-off of the stop valve, the conversion of the control valve and the acquisition and processing of data are controlled by the console.
As shown in fig. 2, the alternating airflow temperature generating device based on the supersonic jet element disclosed in this embodiment is mainly composed of a thermal calibration wind tunnel 1, a supersonic jet element 10, and a valve set. The valve group comprises a pressure reducing valve 5, a three-way flow dividing valve 9, a throttle valve 11 and a three-position three-way electromagnetic control valve 12
The thermal calibration wind tunnel 1 is an existing device and can generate hot air flow with certain temperature and speed in a test section.
The supersonic jet element 10 is an amplifying device which takes fluid as a working medium and has no moving part, utilizes the interaction of fluid flow and some physical effects to control and change the fluid flow and realize the functions of sensing, logic, amplification and the like, and consists of a main air source, a control port and an output end. The supersonic jet flow is formed by the airflow of the main air source passing through a Laval nozzle, and due to the entrainment effect and wall attachment effect of the jet flow, the supersonic jet flow can be stably attached to one end of the jet flow element, and under the alternating action of the left control port and the right control port, the jet flow can be rapidly switched, so that cold airflow which changes according to an alternating rule is formed at the output end.
The control valve group comprises four pressure reducing valves 5 which are connected with the high-pressure gas cylinder to reduce the pressure of the high-pressure gas from the high-pressure gas cylinder to a required pressure and flow; the three-way diverter valve 9 divides the air flow which is diverted after passing through the pressure reducing valve 5 into two parts, wherein the larger part is used as the air supply end of the main air source of the supersonic jet element, and the smaller part is used as the air supply end of the control port of the supersonic jet element; thirdly, a throttle valve 11 is used for further throttling the airflow passing through the air supply end of the control port of the supersonic jet element; and the fourth is a three-position three-way electromagnetic control valve 12 used for controlling the air intake condition of the control port of the supersonic jet element according to an alternating rule.
The three-position three-way electromagnetic control valve 12 is characterized in that three positions refer to three states of the three-position three-way electromagnetic valve, namely an on state, a keeping state and an off state. The tee joint refers to an air source port, a working port and an exhaust port. The structure is composed of a left coil, a right coil, a valve body and a valve core. The right coil of the three-position three-way electromagnetic valve is electrified, and the valve core moves leftwards to block the air source port, so that the valve is in an off state. The left coil of the three-position three-way electromagnetic valve is electrified, the valve core moves to the right to close the exhaust port, and then the valve core is in an open state. When the coil of the three-position three-way electromagnetic valve is not electrified, the valve core is in the middle position to seal the working port, and then the valve core is in a holding state.
The calibration method of the alternating airflow temperature generation device based on the supersonic jet element disclosed by the embodiment comprises the following steps:
step one, opening the thermal calibration wind tunnel 1 to generate stable hot air flow. Since the thermally calibrated wind tunnel 1 is a mature device, it is omitted here.
And step two, opening a pressure reducing valve 5, and reducing the pressure of the high-pressure gas from the high-pressure gas bottle to the required pressure and flow.
And step three, adjusting the three-way diverter valve 9, dividing the air flow which is divided by the pressure reducing valve 5 into two parts, wherein a larger part is used as an air supply end of a main air source of the supersonic jet element, and a smaller part is used as an air supply end of a control port of the supersonic jet element.
And step four, adjusting the throttle valve 11 to further throttle the airflow passing through the air supply end of the control port of the supersonic jet element.
And step five, adjusting the three-position three-way electromagnetic control valve 12, and controlling the jet flow element to generate alternating cold air flow through the control system 15.
And step six, transmitting the alternating cold airflow generated by the supersonic jet element 10 to a test section of the thermal calibration wind tunnel 1 through the gas collecting pipe 4, and mixing the alternating cold airflow with the hot airflow to form high-temperature dynamic calibration airflow.
And step seven, calibrating the calibrated sensor 16 according to the dynamic temperature calibration standard.
And step eight, acquiring signals through the data acquisition system 14, and processing data.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. An alternating airflow temperature generating device based on supersonic jet elements is characterized in that: the device comprises a supersonic jet element and a thermal calibration wind tunnel; the airflow passes through the supersonic speed jet element to generate cold airflow in a sine form, and the cold airflow is mixed with hot airflow generated by the thermal calibration wind tunnel at the outlet to form a high-temperature alternating hot airflow signal, so that the high-temperature dynamic calibration of the airflow temperature sensor is realized.
2. An alternating gas flow temperature generating device based on a supersonic fluidic component in accordance with claim 1, wherein: the high-temperature alternating hot airflow signal is an alternating cold airflow temperature signal with ideal amplitude and frequency periodically changing along with time.
3. An alternating gas flow temperature generating device based on a supersonic fluidic component in accordance with claim 1, wherein: the supersonic jet element comprises a main gas source, a control port, an output end and a three-position three-way electromagnetic control valve; the gas is divided into two parts through a pipeline, one part directly enters a main gas source inlet of the jet flow element, the other part controls two control ports of the jet flow element through a three-position three-way electromagnetic control valve, the quick switching of the main jet flow is realized by using small-flow control gas flow by utilizing the entrainment effect and the wall attachment effect of the jet flow, and controllable cold gas flow changing according to an alternating rule is generated.
4. An alternating gas flow temperature generating device based on a supersonic fluidic component in accordance with claim 1, wherein: the three-position three-way electromagnetic control valve is arranged on a pipeline where the three-position three-way electromagnetic control valve is located, and the throttle valve is used for changing the gas flow into micro flow.
5. An alternating gas flow temperature generating device based on a supersonic fluidic component in accordance with claim 1, wherein: the device also comprises a pressure reducing valve, wherein the pressure reducing valve is connected with the high-pressure gas cylinder and used for reducing the pressure of the high-pressure gas discharged from the high-pressure gas cylinder to the required pressure and flow.
6. An alternating gas flow temperature generating device based on a supersonic fluidic component in accordance with claim 1, wherein: the three-way flow divider divides the air flow divided by the pressure reducing valve into two parts, wherein the larger part is used as the air supply end of the main air source of the supersonic jet element, and the smaller part is used as the air supply end of the control port of the supersonic jet element.
7. An alternating gas flow temperature generating device based on a supersonic fluidic component as defined in claim 1 or 2 wherein: the system comprises a pressure sensor group, a data acquisition system and a control system, wherein the pressure sensor group mainly comprises a pressure sensor, a temperature sensor and a flow sensor which are used for measuring cold air flow passing through a pressure reducing valve; the data acquisition system is used for acquiring voltage signals transmitted by the sensor group and carrying out denoising treatment on the voltage signals; the control system is used for switching on and off and conversion of the valve group and acquisition and processing of data.
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| CN202111586227.5A CN114485996A (en) | 2021-12-22 | 2021-12-22 | Alternating airflow temperature generating device based on supersonic jet element |
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| CN202111586227.5A CN114485996A (en) | 2021-12-22 | 2021-12-22 | Alternating airflow temperature generating device based on supersonic jet element |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117870907A (en) * | 2023-11-23 | 2024-04-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | Dynamic temperature excitation source for thermal calibration wind tunnel |
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2021
- 2021-12-22 CN CN202111586227.5A patent/CN114485996A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117870907A (en) * | 2023-11-23 | 2024-04-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | Dynamic temperature excitation source for thermal calibration wind tunnel |
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