CN107515119B - Parameter measurement comprehensive test system and method for heat flow mechanics - Google Patents
Parameter measurement comprehensive test system and method for heat flow mechanics Download PDFInfo
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- CN107515119B CN107515119B CN201710619720.XA CN201710619720A CN107515119B CN 107515119 B CN107515119 B CN 107515119B CN 201710619720 A CN201710619720 A CN 201710619720A CN 107515119 B CN107515119 B CN 107515119B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
the invention relates to a parameter measurement comprehensive test system and a parameter measurement comprehensive test method for thermal flow mechanics. The test system takes a ducted fan as an air source, a turbine as a power device, PTC heating ceramics and a cylinder as a heating system and a displacement system respectively, and is assisted by pressure difference, pressure, temperature, displacement and rotating speed sensors, so that the measurement of some important parameters (flow, pressure, temperature, displacement, rotating speed and the like) in the operation of the aircraft engine is simulated, and the parameters can be adjusted by adjusting the opening of a valve and controlling input signals. The system can visually display the basic principle of the heat flow mechanics, has comprehensive covered measurement parameters, and has the characteristics of compact structure, low cost, strong operability and the like.
Description
Technical Field
The invention relates to a parameter measurement comprehensive test system for heat flow mechanics, and belongs to the field of testing and control.
background
The temperature, pressure and displacement sensor is widely used for measuring relevant parameters of fluid, but from relevant products of Brilliant corporation or ATPIO corporation of current international mainstream test instrument manufacturers, devices such as XB-9E and XORTS can only realize measurement of single or a few parameters, and test systems for comprehensive measurement simulation and control simulation of relevant parameters of airflow in the operation process of an aircraft engine are not available, and the systems have the characteristics of complex structure, complex operation, high price and the like, so that the requirements of specific customers in the market are difficult to meet.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and provides a parameter measurement comprehensive test system for thermal flow mechanics, which simulates the measurement of some important parameters (temperature, pressure, flow, rotating speed, displacement and the like) in the operation of an aircraft engine and can realize the control of the parameters by adjusting the opening of a valve and controlling input signals.
the invention adopts the following technical scheme for solving the technical problems:
The parameter measurement comprehensive test system for the thermal flow mechanics comprises a system main body module 1, a control module 3 and a measurement module 2,
the system main body module 1 takes the ducted fan 4 as an air source, takes the turbine 12 as a power device, and depends on the PTC heating ceramic 7 and the cylinder 8 to respectively serve as a heating system and a displacement system, wherein the heating system comprises pressure difference, pressure, temperature, displacement and rotating speed sensors, the ducted fan 4 is arranged on the turbine 12, the PTC heating ceramic 7 and the cylinder 8;
The pressure difference, pressure, temperature, displacement and rotating speed sensors are respectively arranged;
the control module 3 comprises an electric adjusting plate 31, a silicon controlled voltage adjusting module 32, a speed adjusting potentiometer 29 and a voltage adjusting potentiometer 30, wherein the electric adjusting plate 31 is connected with the speed adjusting potentiometer 29 and directly participates in the rotating speed control of the ducted fan 4; the silicon controlled voltage regulating module 32 is connected with the voltage regulating potentiometer 30 and directly participates in the temperature control of the PTC heating ceramic 7;
the measuring module 2 comprises a signal conditioning unit 24, a collecting interface 25, a signal collector 26 and a computer terminal 27, wherein the signal conditioning unit 24 connects the conditioned data signal with the signal collector 26 through the collecting interface 25, and then the signal acquisition card connected with the computer terminal 27 performs signal acquisition and processing.
further, the blades of the turbine 12 are made of an aluminum alloy material, the radial magnetizing high-strength magnet is fixed on the rotating shaft of the turbine 12, a reluctance pulse signal generated in the rotating process of the turbine 12 is collected by a reluctance type rotating speed sensor arranged 35-40mm above the rotating shaft of the turbine, and then the reluctance pulse signal is converted into a TTL signal through the signal conditioning unit 24 to be output.
Further, during operation, the ducted fan 4 adopts a PWM modulation mode to realize accurate control of the rotating speed, the initial airflow generated by the ducted fan is separated by the three-way valve A5, a part of the initial airflow is heated by the PTC heating ceramic 7, and then the initial airflow is mixed with the main pipeline airflow by the three-way valve B6 to further push the turbine 12 to rotate.
The comprehensive test method for measuring parameters of the thermal flow mechanics is characterized in that the control of the rotating speed of the turbine 12 comprises two adjusting schemes:
Firstly, a PWM (pulse-width modulation) mode is utilized to control the ducted fan 4 to generate main flow gas with different pressures and speeds, so that the control of the rotating speed of the turbine 12 is realized; or a throttle valve C11 is arranged at the position 15-20mm behind the turbine 12, and the rotation speed control is realized by adjusting the opening of the valve, namely adjusting the outlet back pressure of the turbine 12.
based on the test system, the invention provides a parameter measurement comprehensive test method for thermal flow mechanics, and the system main body module 1 is characterized in that the displacement measurement is realized by leading gas with certain pressure out of a main flow pipeline to be connected into a cylinder 8, converting a pressure signal into a displacement signal and utilizing an LVDT displacement sensor.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
Through the design of the comprehensive test system for measuring the parameters of the opposite thermohydrodynamics, the measurement of some important parameters (temperature, pressure, flow, rotating speed, displacement and the like) in the operation of the aircraft engine is simulated, and the measurement and the control of the parameters can be realized through regulating the opening of a valve and controlling input signals. The system can visually display the basic principle of the heat flow mechanics, has comprehensive covered measurement parameters, and has the characteristics of compact structure, low cost, strong operability and the like.
drawings
FIG. 1 is a schematic diagram of a parameter measurement comprehensive test system for thermal flow mechanics;
FIG. 2 is a schematic circuit diagram of a signal conditioning unit of a measurement module in a parameter measurement comprehensive test system for thermal flow mechanics.
Detailed Description
the technical scheme of the invention is further explained in detail by combining the attached drawings:
As shown in the attached figure 1, the parameter measurement comprehensive test system facing the thermal flow mechanics comprises a system main body module 1, a control module 3 and a measurement module 2. The system main body module is composed of ten different sensors in total, wherein the ducted fan 4 is used as an air source, the turbine 12 is used as a power device, the PTC heating ceramic 7 and the cylinder 8 are used as a heating system and a displacement system respectively, and the pressure difference sensors 13 and 20, the pressure sensors 14, 17 and 19, the temperature sensors 15, 16 and 21, the displacement sensor 22, the rotating speed sensor 18 and the like are used as auxiliary materials. In operation, a specific PWM signal is first provided to the electronic control board 31 of the ducted fan 4 through the PC terminal by using the related control program, so that the ducted fan 4 starts to operate, and generates an airflow with a certain speed and pressure, the initial airflow is separated when passing through the three-way valve a5, and a part of the airflow continues to flow out through the throttle valve a9 behind the main pipeline. The other part is heated by PTC heating ceramic 7 after the throttle valve B10, then mixed with the main pipeline air flow through the three-way valve B6 to push the turbine 12 to rotate, and finally the air flow is discharged to the outside atmosphere through the throttle valve C11.
The control module 3 is composed of an electric regulation plate 31 and a silicon controlled voltage regulation module 32, the electric regulation plate 31 is connected with a speed regulation potentiometer 29 and directly participates in the rotating speed control of the ducted fan 4, the silicon controlled voltage regulation module 32 is connected with a voltage regulation potentiometer 30 and directly participates in the temperature control of the PTC heating ceramic 7, and the two potentiometers 29 and 30 are connected with the measurement module 2 through a control interface 28.
The measuring module 2 is composed of a signal conditioning unit 24, an acquisition interface 25 and a signal collector 26, the signal conditioning unit 24 is used for designing and manufacturing corresponding circuit boards by utilizing the input and output characteristics of different sensors, conditioned data signals are connected with the signal collector 26 through the acquisition interface 25, and the signal collector 26 is used for collecting signals by adopting a myRIO1900 series signal acquisition card of NI corporation. The signal collector 26 then collects and collates the relevant data by connecting to a computer terminal 27.
the rotational speed control of the ducted fan 4 adopts a corresponding control program developed based on Labview software to provide a specific PWM signal for the electric adjusting plate 31 of the ducted fan 4, so that the rotational speed of the ducted fan is accurately controlled, and then the main air flow with certain speed and pressure generated by the ducted fan is utilized to carry out the next experiment.
The rotating speed of the turbine 12 is measured, blades of the turbine 12 are made of aluminum alloy, a piece of high-strength magnet which is magnetized in the radial direction is arranged on a rotating shaft of the turbine 12, the high-strength magnet which is magnetized in the radial direction can generate magnetic resistance pulse signals which change alternately in the rotating process of the turbine 12, and the KMI15/1 magnetic resistance type rotating speed sensor 18 which is fixed right above the high-strength magnet which is magnetized in the radial direction is used for capturing the magnetic resistance pulse signals generated in the rotating process of the turbine 12, and then the signals are converted into TTL signals which can be collected by a signal collection card to be output.
The heating system adopts the PTC heating ceramic 7, has the advantages of no open fire, high control precision and good safety, and utilizes the silicon controlled voltage regulating module 32 in the control module 3 to correspondingly control the temperature of the PTC heating ceramic 7 by outputting different voltage values.
the displacement system is composed of a cylinder 8 and an LVDT displacement sensor 22, the displacement measurement is realized by leading gas with certain pressure out of a main flow pipeline to be connected into the cylinder 8, converting a pressure signal into a displacement signal and utilizing the LVDT displacement sensor 22 to realize the measurement of displacement parameters.
The signal conditioning unit 24 is designed and manufactured based on different sensor input and output characteristics, wherein the pressure sensors 14, 17 and 19, the differential pressure sensors 13 and 20, the displacement sensor 22, the rotation speed sensor 18 and the temperature sensors 15, 16 and 21 all generate 4-20mA current output through a sensor bus, the current output is converted into 1-5V voltage output which can be processed by a signal acquisition card in the measuring module through connecting 250-ohm resistors R1, R2, R3, R4, R5, R6, R7 and R8, wherein each 250-ohm resistor is respectively connected with a 0.0001F capacitor in parallel for filtering, and a +24V power input end is connected with a diode D1 for preventing power supply short circuit.
The circuit board is provided with a processing unit which can process square wave signals generated by the KMI15/1 reluctance type rotating speed sensor 18, the LM339 voltage comparator 33 in the processing unit is used for correspondingly processing the square wave signals generated by the KMI15/1 reluctance type rotating speed sensor 18, namely, a standard comparison voltage of 0.58V is provided for No. 10 pin in the LM339 voltage comparator 33, and a related circuit is compared with the square wave signals input by No. 11 pin as shown in figure 2, so that the LM339 voltage comparator 33 generates 0-5V TTL signals which can be directly collected by a signal collection card and outputs the TTL signals.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit 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 protection scope of the present invention.
Claims (5)
1. a parameter measurement comprehensive test system for thermal flow mechanics is characterized by comprising a system main body module (1), a control module (3) and a measurement module (2),
the system main body module (1) is connected through a main channel by taking a ducted fan (4) as an air source and a turbine (12) as a power device, and is respectively taken as a heating system and a displacement system by relying on PTC heating ceramics (7) and a cylinder (8), and the test system further comprises a differential pressure sensor, a temperature sensor, a displacement sensor and a rotating speed sensor;
The ducted fan (4) is arranged at the front end of an inlet airflow position in the main body module, the turbine (12) is arranged at the tail end of an airflow outlet in the main body module, the PTC heating ceramic (7) is arranged in the middle of a pipeline which is connected with a main channel airflow in the main body module in parallel, and the air cylinder (8) is connected with a pipeline beside the middle airflow of the main channel in the system main body module;
The differential pressure sensors comprise at least two, wherein a first differential pressure sensor (13) is arranged close to the rear part of the ducted fan (4), a second differential pressure sensor (20) is arranged close to the rear part of the turbine (12), and the differential pressure sensors respectively measure the parameters of the air flow inlet differential pressure and the air flow outlet differential pressure;
The pressure sensors comprise at least three pressure sensors, wherein a first pressure sensor (14) is arranged at the rear part close to the ducted fan (4) and is distributed at the same circumference and opposite sides with a second pressure difference sensor (14), a second pressure sensor (17) is arranged at the front part close to the turbine (12), and a third pressure sensor (19) is arranged at the rear part close to the turbine (12) and is used for respectively measuring parameters of airflow inlet pressure, airflow outlet pressure and airflow outlet back pressure;
The temperature sensors comprise at least three temperature sensors, wherein a first temperature sensor (15) is arranged close to the front end of the PTC heating ceramic (7), a second temperature sensor (16) is arranged close to the rear part of the PTC heating ceramic (7), a third temperature sensor (21) is arranged close to the front part of the turbine (12), is distributed at the same circumference and opposite sides with the second pressure sensor (17), and respectively measures the temperature before heating, the temperature after heating and the temperature after mixing;
the displacement sensor (22) is arranged close to the rear part of the cylinder (8) and is used for measuring displacement parameters;
The rotating speed sensor (18) is arranged right above the outlet section of the turbine (12) and is used for measuring rotating speed parameters;
The control module (3) comprises an electric adjusting plate (31), a silicon controlled voltage regulating module (32), a speed regulating potentiometer (29) and a voltage regulating potentiometer (30), wherein the electric adjusting plate (31) is connected with the speed regulating potentiometer (29) and directly participates in the rotating speed control of the ducted fan (4); the silicon controlled voltage regulating module (32) is connected with the voltage regulating potentiometer (30) and directly participates in the temperature control of the PTC heating ceramic (7);
The measuring module (2) comprises a signal conditioning unit (24), an acquisition interface (25), a signal collector (26) and a computer terminal (27), wherein the signal conditioning unit (24) connects the conditioned data signal with the signal collector (26) through the acquisition interface (25), and then the signal acquisition card connected with the computer terminal (27) acquires and processes the signal.
2. The comprehensive test system for measuring parameters of thermodynamic engineering as claimed in claim 1, wherein the blades of the turbine (12) are made of aluminum alloy, and by fixing a high-strength magnet magnetized radially on the rotating shaft of the turbine (12), a reluctance pulse signal generated during the rotation of the turbine (12) is collected by a reluctance type rotation speed sensor arranged 35-40mm above the rotating shaft of the turbine, and then converted into a TTL signal by a signal conditioning unit (24) for output.
3. the test method of the parameter measurement comprehensive test system facing the thermal flow mechanics as claimed in claim 1, wherein in operation, the ducted fan (4) adopts a PWM modulation mode to realize accurate control of the rotation speed thereof, the initial airflow generated by the ducted fan is separated by a three-way valve A (5), a part of the initial airflow is heated by PTC heating ceramics (7), and then the initial airflow is mixed with the main pipeline airflow by a three-way valve B (6) to push the turbine (12) to rotate.
4. A test method as claimed in claim 3, characterized in that said control of the rotation speed of the turbine (12) comprises two regulation schemes:
Firstly, a PWM modulation mode is utilized to control a ducted fan (4) to generate main flow gas with different pressures and speeds, and further the control of the rotating speed of a turbine (12) is realized; or a throttle valve C (11) is arranged 15-20mm behind the turbine (12), and the rotation speed control is realized by adjusting the opening of the valve, namely adjusting the outlet back pressure of the turbine (12).
5. test method according to claim 3, characterized in that the displacement is measured by tapping a gas under pressure from the main flow line into a cylinder (8), converting the pressure signal into a displacement signal, and measuring the displacement parameter by means of an LVDT displacement sensor.
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| CN201710619720.XA CN107515119B (en) | 2017-07-26 | 2017-07-26 | Parameter measurement comprehensive test system and method for heat flow mechanics |
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| CN201710619720.XA CN107515119B (en) | 2017-07-26 | 2017-07-26 | Parameter measurement comprehensive test system and method for heat flow mechanics |
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| CN107515119A CN107515119A (en) | 2017-12-26 |
| CN107515119B true CN107515119B (en) | 2019-12-06 |
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| CN114162361B (en) * | 2022-02-14 | 2022-05-06 | 中国人民解放军战略支援部队航天工程大学 | Aerodynamic vector propulsion system of satellite ground simulation device |
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