CN112539939B - Phase change engine tail flame temperature testing device and control method - Google Patents
Phase change engine tail flame temperature testing device and control method Download PDFInfo
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Abstract
The invention discloses a phase change engine tail flame temperature testing device and a control method, the device comprises an engine combustion chamber, a gas nozzle, a temperature calibration sensor, an infrared thermometer and a controller, wherein the controller is used for collecting the initial temperature and the instantaneous temperature of the tail flame of a phase change engine sensed by a plurality of gas temperature sensors, receiving the initial temperature and the instantaneous temperature monitored by the infrared thermometer and calculating the corrected actual temperature; and recording the temperature of the tail flame of the phase change engine according to the time interval of the set sampling frequency and drawing a temperature-time change curve. The invention can automatically calibrate the measurement data of the infrared thermometer and record the process change of the tail flame temperature in real time; accurately measuring the temperature of the tail flame of the phase change engine; through analyzing and researching the measured data, the design of the phase change engine can be corrected, the propellant fuel ratio can be adjusted, the infrared radiation characteristic of the engine can be optimized, and the like; the temperature averaging algorithm can eliminate the artificial deviation in the installation process more greatly.
Description
Technical Field
The invention relates to the field of temperature testing of phase change engines, and particularly discloses a device and a method for testing the temperature of tail flames of a phase change engine.
Background
The tail flame is high-temperature and high-speed airflow sprayed by an aircraft engine, has important significance for researching the infrared radiation characteristic of the aircraft tail flame, and can provide reliable data for infrared protection. The temperature field, the pressure field, the tail flame components and the like of the tail flame must be obtained when the infrared radiation intensity of the tail flame is researched. The study on the temperature, the pressure, the components and the like of the tail flame has important significance for better performing the infrared stealth technology of the tail flame. Engine flame temperature is one of the important thermodynamic parameters of the combustion process. At present, data show that certain research is carried out on the missile flame temperature testing technology; moreover, for the design of various tactical and strategic weapon systems, the flame temperature of the engine gas flow directly affects the design index and the way to reach the design index; the temperature of the nozzle of the engine has important significance for selecting and increasing the specific impulse of the throat lining material.
In the temperature test of the tail flame sprayed out from the engine, because the highest temperature can reach about 700 ℃, an infrared thermometer is generally adopted for non-contact measurement, and the measurement temperature of the tail flame is displayed through a display window of the infrared thermometer. In the prior art, the focal length is adjusted through an optical lens of an infrared thermometer to lock a laser spot of a tail flame measuring point, corresponding parameters are set through a setting panel, and finally the temperature measured by the tail flame is displayed in a window. Patent CN1080511011A discloses an engine temperature test system based on STM32 singlechip, including PCB board circuit, thermocouple and host computer, PCB board circuit includes STM32 main control unit module, analog amplification circuit module, cold junction compensation module, serial circuits module, LCD display module, FlaSH data storage module, nRF-2.4G wireless transmission module, crystal oscillator module and reset module, analog amplification circuit module is used for amplifying the temperature signal that thermocouple and cold junction compensation module surveyed and sends STM32 main control unit module to, LCD display module is used for showing the temperature in real time, FlaSH data storage module is used for the storage temperature data. In the prior art, the following defects exist: 1. the accuracy of the surface temperature of the measured object cannot be determined; 2. the manual setting of temperature parameters is complicated; 3. the course of the temperature cannot be recorded.
Therefore, the above-mentioned defects of the existing engine temperature testing system are a technical problem to be solved urgently.
Disclosure of Invention
The invention provides a phase change engine tail flame temperature testing device and a control method, and aims to solve the technical problem of the defects of the existing engine temperature testing system.
One aspect of the invention relates to a phase change engine tail flame temperature testing device, which comprises an engine combustion chamber, a gas nozzle, a temperature calibration sensor, an infrared thermometer and a controller, wherein,
the jet port is communicated with the engine combustion chamber and is used for jetting tail flames of the phase change engine;
the temperature calibration sensors are circumferentially arranged at the outlet of the gas nozzle and used for sensing the temperature of the tail flame of the phase change engine in all directions to calibrate the installation position of the phase change engine;
the infrared thermometer is arranged in front of the combustion chamber of the engine and used for monitoring the tail flame temperature of the tail flame infrared temperature measuring point of the phase change engine;
the controller is respectively connected with the plurality of gas temperature sensors and the infrared thermometer and is used for acquiring the initial temperature and the instantaneous temperature of the tail flame of the phase change engine sensed by the plurality of gas temperature sensors, receiving the initial temperature and the instantaneous temperature monitored by the infrared thermometer and calculating the actual temperature of the tail flame of the phase change engine after correction; and recording the temperature of the tail flame of the phase change engine according to the time interval of the set sampling frequency and drawing a temperature-time change curve.
Furthermore, the temperature calibration sensor adopts four gas temperature sensors, and the four gas temperature sensors are circumferentially arranged in the upper, lower, left and right directions of the gas jet outlet.
Further, the phase change engine tail flame temperature testing device also comprises a first self-reset calibration switch and a second self-reset calibration switch,
the first self-reset calibration switch and the second self-reset calibration switch are connected to the positive input end of the switching value signal of the controller; the temperature calibration sensor and the infrared thermometer are connected to the analog quantity signal input end of the controller.
Further, the phase change engine tail flame temperature testing device further comprises a USB-to-CAN module and a terminal, wherein the controller is connected with the terminal through the USB-to-CAN module and is used for broadcasting the calculated actual temperature corrected by the phase change engine tail flame to the terminal in a PDO mode through a CAN bus in real time and recording the actual temperature through CANKing software.
Further, the infrared thermometer is ABSD-3014 manufactured by Obose Saddy, Shandong.
Furthermore, the model of the gas temperature sensor is KL-H-T-2-2 produced by the Seaman Crick company; the self-reset calibration switch is manufactured by KN1A-112M of Vighua of Guizhou.
The invention also relates to a phase change engine tail flame temperature test control method, which is applied to the phase change engine tail flame temperature test device and comprises the following steps:
acquiring initial temperature and instantaneous temperature of tail flame of a phase change engine sensed by a plurality of temperature calibration sensors;
receiving the initial temperature and the instantaneous temperature of an infrared temperature measuring point of the tail flame of the phase change engine monitored by an infrared thermometer;
calculating the corrected actual temperature of the tail flame of the phase change engine according to the initial temperature and the instantaneous temperature of the tail flame of the phase change engine sensed by the plurality of collected temperature calibration sensors and the initial temperature and the instantaneous temperature of the infrared temperature measuring point of the tail flame of the phase change engine monitored by the received external temperature measuring instrument;
and recording the temperature of the tail flame of the phase change engine according to the calculated actual temperature after the tail flame of the phase change engine is corrected and the time interval of the set sampling frequency, and drawing a temperature-time change curve graph.
Further, the step of calculating the actual temperature of the phase change engine tail flame after correction according to the initial temperature and the instantaneous temperature of the phase change engine tail flame sensed by the plurality of collected temperature calibration sensors and the initial temperature and the instantaneous temperature of the phase change engine tail flame infrared temperature measurement point monitored by the received external thermometer comprises the following steps:
receiving a first control signal sent by a first self-reset calibration switch, calculating initial average calibration temperature of tail flame of the phase change engine and recording initial current of an infrared thermometer at the moment according to the initial temperature of the tail flame of the phase change engine sensed by four collected temperature calibration sensors and the received initial temperature of the infrared temperature measuring point of the tail flame of the phase change engine monitored by an external thermometer;
receiving a second control signal sent by a second self-reset calibration switch, calculating the instantaneous average calibration temperature of the tail flame of the phase change engine and recording the instantaneous current of the infrared thermometer at the moment according to the instantaneous temperature of the tail flame of the phase change engine sensed by the four collected temperature calibration sensors and the instantaneous temperature of the infrared temperature measuring point of the tail flame of the phase change engine monitored by the external thermometer;
and fitting a trend line of the actual correction temperature according to the calculated initial average calibration temperature and initial current of the phase change engine tail flame and the instantaneous average calibration temperature and instantaneous current of the phase change engine tail flame, and calculating the accurate real-time temperature of the phase change engine tail flame according to a function expression of the trend line.
Further, the initial average calibration temperature of the phase change engine tail flame is calculated by the following equation:
MeanT_1＝(T1_1+T2_1+T3_1+T4_1-min(T1_1，T2_1，T3_1，T4_1))/3
where MeanT _1 represents an initial average calibration temperature of the phase change engine tail flame, and T1_1 is a first initial temperature of the phase change engine tail flame sensed by the first temperature calibration sensor; t2_1 is a second initial temperature of the phase change engine tail flame sensed by the second temperature calibration sensor; t3_1 is a third initial temperature of the phase change engine tail flame sensed by the third temperature calibration sensor; t4_1 is a fourth initial temperature of the phase change engine tail flame sensed by the fourth temperature calibration sensor; min (T1_1, T2_1, T3_1, T4_1) represents the minimum initial temperature among the four gas temperature sensors;
the instantaneous average calibration temperature of the phase change engine tail flame is calculated by the following formula:
MeanT_2＝(T1_2+T2_2+T3_2+T4_2-min(T1_2，T2_2，T3_2，T4_2))/3
where MeanT _2 represents the instantaneous average calibration temperature of the phase change engine tail flame; t1_2 is the first instantaneous temperature of the phase change engine tail flame sensed by the first temperature calibration sensor; t2_2 is a second instantaneous temperature of the phase change engine tail flame sensed by the second temperature calibration sensor; t3_2 is the third instantaneous temperature of the phase change engine tail flame sensed by the third temperature calibration sensor; t4_2 is the fourth instantaneous temperature of the phase change engine tail flame sensed by the fourth temperature calibration sensor; min (T1_2, T2_2, T3_2, T4_2) represents the minimum instantaneous temperature among the four gas temperature sensors;
the actual temperature after the phase change engine tail flame correction is calculated by the following formula:
(MeanT-MeanT_1)/(I-I_1)＝(MeanT_2-MeanT_1)/(I_2-I_1)
wherein MeanT represents the corrected actual temperature value, and I represents the current value of the infrared thermometer at that time; MeanT _1 represents the initial average calibration temperature of the phase change engine tail flame, and MeanT _2 represents the instantaneous average calibration temperature of the phase change engine tail flame; i _1 represents the initial current of the phase change engine tail flame; i _2 represents the instantaneous current of the phase change engine tail flame.
The beneficial effects obtained by the invention are as follows:
the invention provides a phase change engine tail flame temperature testing device and a control method, wherein the device adopts an engine combustion chamber, a gas nozzle, a temperature calibration sensor, an infrared thermometer and a controller, and the controller collects the initial temperature and the instantaneous temperature of the tail flame of the phase change engine sensed by a plurality of gas temperature sensors, receives the initial temperature and the instantaneous temperature monitored by the infrared thermometer and calculates the actual temperature of the tail flame of the phase change engine after correction; recording the temperature of the tail flame of the phase change engine according to the time interval of the set sampling frequency, drawing a temperature-time change curve, automatically calibrating the temperature collected by an infrared thermometer through a controller algorithm and control logic, and completely recording the temperature change in the ignition experiment process of the phase change engine; the algorithm of the temperature average value can eliminate the artificial deviation in the installation process; and the two times of sampling and calibration enable the calculated temperature to be more accurate and closer to the actual temperature. The phase change engine tail flame temperature testing device and the control method provided by the invention can automatically calibrate the measurement data of the infrared thermometer and record the process change of the tail flame temperature in real time; accurately measuring the temperature of the tail flame of the phase change engine; through analyzing and researching the measured data, the design of the phase change engine can be corrected, the propellant fuel ratio can be adjusted, the infrared radiation characteristic of the engine can be optimized, and the like; the temperature averaging algorithm can eliminate the artificial deviation in the installation process more greatly.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a phase change engine tail flame temperature testing device according to the present invention;
FIG. 2 is a schematic perspective view of an embodiment of a phase change engine tail flame temperature testing apparatus according to the present invention;
FIG. 3 is a schematic side view of an embodiment of a phase change engine tail flame temperature testing apparatus according to the present invention;
FIG. 4 is a schematic front structural diagram of an embodiment of a phase change engine tail flame temperature testing apparatus provided in the present invention;
FIG. 5 is a schematic circuit diagram of an embodiment of a phase change engine tail flame temperature testing apparatus provided in the present invention;
FIG. 6 is a functional block diagram of one embodiment of the controller shown in FIG. 5;
FIG. 7 is a functional block diagram of one embodiment of the computing module shown in FIG. 6;
FIG. 8 is a graph of temperature data collected recorded by a phase change engine tail flame temperature testing apparatus provided in the present invention;
FIG. 9 is a schematic flow chart illustrating an embodiment of a phase change engine tail flame temperature test control method provided by the present invention;
fig. 10 is a detailed flowchart of an embodiment of the step shown in fig. 9 for calculating the corrected actual temperature of the phase change engine tail flame according to the initial temperature and the instantaneous temperature of the phase change engine tail flame sensed by the plurality of collected temperature calibration sensors and the initial temperature and the instantaneous temperature of the phase change engine tail flame infrared temperature measurement point monitored by the received external thermometer.
The reference numbers illustrate:
10. an engine combustion chamber; 20. an air jet; 30. a temperature calibration sensor; 40. an infrared thermometer; 50. a controller; 60. a first self-reset calibration switch; 70. a second self-reset calibration switch; 80. USB changes CAN module; 90. a terminal; 100. phase change engine tail flame; 200. an infrared temperature measuring point; 11. a test bench; 12. a base; 13. a support frame; 121. a convex strip; 131. a slider; 122. a stopper; 14. mounting screws on the bracket; 51. an acquisition module; 52. a communication module; 53. a calculation module; 54. a drawing module; 531. a first calculation unit; 532. a second calculation unit; 533. and a third calculation unit.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
As shown in fig. 1 to 5, a phase change engine tail flame temperature testing apparatus according to a first embodiment of the present invention includes an engine combustion chamber 10, a gas nozzle 20, a temperature calibration sensor 30, an infrared thermometer 40, and a controller 50, wherein the gas nozzle 20 is communicated with the engine combustion chamber 10 and is used for injecting a phase change engine tail flame 100; the temperature calibration sensors 30 are arranged in a plurality, and the plurality of temperature calibration sensors 30 are circumferentially arranged at the outlet of the gas nozzle 20 and used for sensing the temperature of the tail flame 100 of the phase change engine in all directions to calibrate the installation position of the phase change engine; the infrared thermometer 40 is arranged in front of the engine combustion chamber 10 and is used for monitoring the tail flame temperature of the phase change engine tail flame infrared temperature measuring point 200; the controller 50 is respectively connected with the plurality of temperature calibration sensors 30 and the infrared thermometer 40, and is configured to collect the initial temperature and the instantaneous temperature of the phase change engine tail flame 100 sensed by the plurality of temperature calibration sensors 30, receive the initial temperature and the instantaneous temperature of the phase change engine tail flame 100 monitored by the infrared thermometer 40, and calculate an actual temperature of the phase change engine tail flame after correction; and recording the temperature of the tail flame of the phase change engine according to the time interval of the set sampling frequency and drawing a temperature-time change curve. This phase change engine tail flame temperature testing arrangement is still including the test bench 11 that is used for installing engine combustion chamber 10, test bench 11 includes base 12, support frame 13 and slider 131, base 12 and support frame 13 fixed connection, base 12 top is located to support frame 13, be equipped with on the support frame 13 with sand grip 121, the one end and the engine combustion chamber 10 fixed connection of slider 131, the other end and the support frame 13 sliding connection of slider 131, it is equipped with the recess corresponding with sand grip 121 to correspond on the slider 131, slider 131 can slide in order to drive engine combustion chamber 10 and remove along the horizontal direction relatively sand grip 121, be equipped with the dog 122 that is used for backstop jet 20 on the engine combustion chamber 10 to remove on the base 12, be equipped with the support mounting screw 14 that is used for installing temperature calibration sensor 30 on the outer wall that engine combustion chamber 10 is close to jet 20 one side. In this embodiment, the laser spot is positioned at the infrared temperature measuring point 200 of the tail flame exit by adjusting the focal length of the infrared thermometer 40, so that the infrared thermometer 40 can monitor the tail flame temperature of the laser spot. In this embodiment, the model of the infrared thermometer is ABSD-3014 manufactured by Obose Saidel, Shandong.
In the above structure, referring to fig. 3 and fig. 4, in the phase change engine tail flame temperature testing apparatus provided in this embodiment, the temperature calibration sensor 30 employs four gas temperature sensors, and the four gas temperature sensors are circumferentially disposed in four directions, namely, up, down, left, and right, at the outlet of the gas nozzle 20. In the present embodiment, the temperature calibration sensors 30 are arranged in four directions, i.e., up, down, left, and right, at the outlet of the gas nozzle 20, and a gas temperature sensor is temporarily installed in each direction for calibration, and the model of the gas temperature sensor is KL-H-T-2-2 manufactured by sienna leitec corporation.
Further, referring to fig. 5, fig. 5 is a schematic circuit structure diagram of an embodiment of the phase change engine tail flame temperature testing apparatus provided by the present invention, in this embodiment, the phase change engine tail flame temperature testing apparatus further includes a first self-resetting calibration switch 60, a second self-resetting calibration switch 70, a USB-to-CAN module 80, and a terminal 90, wherein the first self-resetting calibration switch 60 is respectively connected to the plurality of temperature calibration sensors 30, the infrared thermometer 40, and the forward switching value signal input pins of the controller 50; the second self-resetting calibration switch 70 is respectively connected to the negative switch signal input pins of the plurality of temperature calibration sensors 30, the infrared thermometer 40 and the controller 50. The controller 50 is connected with the terminal 90 through the USB-to-CAN module 80, and is configured to broadcast and send the calculated actual temperature of the phase change engine tail flame after correction in a PDO manner through the CAN bus in real time. In the present embodiment, the self-reset calibration switch is manufactured by KN1A-112M manufactured by Vighua of Guizhou.
Preferably, referring to fig. 6, fig. 6 is a functional block diagram of an embodiment of the controller shown in fig. 5, in this embodiment, the controller 50 includes an acquisition module 51, a communication module 52, a calculation module 53 and a mapping module 54, the acquisition module 51 is configured to acquire an initial temperature and an instantaneous temperature of an end flame of the phase change engine sensed by a plurality of temperature calibration sensors; the communication module 52 is configured to receive the initial temperature and the instantaneous temperature of the phase change engine tail flame infrared temperature measurement point monitored by the infrared thermometer; the calculation module 53 is configured to calculate an actual temperature of the phase change engine after the phase change engine tail flame is corrected according to the initial temperature and the instantaneous temperature of the phase change engine tail flame sensed by the collected multiple temperature calibration sensors and the initial temperature and the instantaneous temperature of the phase change engine tail flame infrared temperature measurement point monitored by the received external temperature detector; the drawing module 54 is configured to record the temperature of the phase change engine tail flame according to the time interval of the set sampling frequency and draw a temperature-time change curve according to the calculated actual temperature after the phase change engine tail flame is corrected. Specifically, referring to fig. 7, fig. 7 is a functional module schematic diagram of an embodiment of the computing module shown in fig. 6, where the computing module 53 includes a first computing unit 531, a second computing unit 532, and a third computing unit 533, where the first computing unit 531 is configured to receive a first control signal sent from a first self-reset calibration switch, and calculate an initial average calibration temperature and an initial current of a phase change engine tail flame according to the collected initial temperature of the phase change engine tail flame sensed by the four temperature calibration sensors and the received initial temperature of the phase change engine tail flame infrared temperature measurement point monitored by the external thermometer; the second calculating unit 532 is configured to receive a second control signal sent by the second self-resetting calibration switch, and calculate an instantaneous average calibration temperature and an instantaneous current of the phase change engine tail flame according to the acquired instantaneous temperature of the phase change engine tail flame sensed by the four temperature calibration sensors and the received instantaneous temperature of the phase change engine tail flame infrared temperature measurement point monitored by the external thermometer; the third calculating unit 533 is configured to fit a linear relationship of an actual correction line according to the calculated initial average calibration temperature and initial current of the phase change engine tail flame and the calculated instantaneous average calibration temperature and instantaneous current of the phase change engine tail flame, and calculate an actual temperature of the phase change engine tail flame after correction.
The initial average calibration temperature of the phase change engine tail flame is calculated by the following equation:
MeanT_1＝(T1_1+T2_1+T3_1+T4_1-min(T1_1，T2_1，T3_1，T4_D)/3 (1)
in formula (1), mean _1 represents the initial average calibration temperature of the phase change engine tail flame, and T1_1 is the first initial temperature of the phase change engine tail flame sensed by the first temperature calibration sensor; t2_1 is a second initial temperature of the phase change engine tail flame sensed by the second temperature calibration sensor; t3_1 is a third initial temperature of the phase change engine tail flame sensed by the third temperature calibration sensor; t4_1 is a fourth initial temperature of the phase change engine tail flame sensed by the fourth temperature calibration sensor; min (T1_1, T2_1, T3_1, T4_1) represents the minimum initial temperature among the four gas temperature sensors.
The instantaneous average calibration temperature of the phase change engine tail flame is calculated by the following formula:
MeanT_2＝(T1_2+T2_2+T3_2+T4_2-min(T1_2，T2_2，T3_2，T4_2))/3 (2)
in formula (2), MeanT _2 represents the instantaneous average calibration temperature of the phase change engine tail flame; t1_2 is the first instantaneous temperature of the phase change engine tail flame sensed by the first temperature calibration sensor; t2_2 is a second instantaneous temperature of the phase change engine tail flame sensed by the second temperature calibration sensor; t3_2 is the third instantaneous temperature of the phase change engine tail flame sensed by the third temperature calibration sensor; t4_2 is the fourth instantaneous temperature of the phase change engine tail flame sensed by the fourth temperature calibration sensor; min (T1_2, T2_2, T3_2, T4_2) represents the minimum instantaneous temperature among the four gas temperature sensors.
The actual temperature after the phase change engine tail flame correction is calculated by the following formula:
(MeanT-MeanT_1)/(I-I_1)＝(MeanT_2-MeanT_1)/(I_2-I_1) (3)
in the formula (3), MeanT represents the corrected actual temperature value, and I represents the current value of the infrared thermometer at that time; MeanT _1 represents the initial average calibration temperature of the phase change engine tail flame, and MeanT _2 represents the instantaneous average calibration temperature of the phase change engine tail flame; i _1 represents the initial current of the phase change engine tail flame; i _2 represents the instantaneous current of the phase change engine tail flame.
The phase change engine tail flame temperature testing device provided by the embodiment can draw a temperature acquisition data graph as shown in fig. 8 through two times of data acquisition; the controller 50 broadcasts the temperature process value MeanT in real time over the CAN bus in PDO mode. Signals are connected into a computer by a USB-CAN conversion module (the model is Kvaser Leaf Light HS V2 in Sweden), the sampling frequency is set to be 20ms in CANKing software, and the temperature of the tail flame of the phase change engine CAN be recorded according to the time interval of 20ms and a temperature-time change curve CAN be drawn. In the embodiment, through analyzing and researching the recorded measurement data, the design of the phase change engine can be corrected, the propellant fuel ratio can be adjusted, the infrared radiation characteristic of the engine can be optimized, the limitation that only one temperature can be displayed in the past is overcome, and meanwhile the problem that cost waste of introducing millions of devices for collecting imports is solved.
As shown in fig. 9, fig. 9 is a schematic flowchart of an embodiment of a phase change engine tail flame temperature test control method provided by the present invention, and is applied to the phase change engine tail flame temperature test device, where the phase change engine tail flame temperature test control method includes the following steps:
and S100, acquiring initial temperature and instantaneous temperature of the tail flame of the phase change engine sensed by a plurality of temperature calibration sensors.
And S200, receiving the initial temperature and the instantaneous temperature of the phase change engine tail flame infrared temperature measuring point monitored by an infrared thermometer.
And S300, calculating the corrected actual temperature of the tail flame of the phase change engine according to the initial temperature and the instantaneous temperature of the tail flame of the phase change engine sensed by the plurality of collected temperature calibration sensors and the initial temperature and the instantaneous temperature of the infrared temperature measuring point of the tail flame of the phase change engine monitored by the received external temperature measuring instrument.
And step S400, recording the temperature of the tail flame of the phase change engine according to the calculated actual temperature after the tail flame of the phase change engine is corrected and the time interval of the set sampling frequency, and drawing a temperature-time change curve graph.
Referring to fig. 10, fig. 10 is a schematic view illustrating a detailed flow of the step S300 in fig. 9, in this embodiment, the step S300 includes:
and S310, receiving a first control signal sent by a first self-reset calibration switch, calculating an initial average calibration temperature of the tail flame of the phase change engine according to the initial temperature of the tail flame of the phase change engine sensed by the four collected temperature calibration sensors and the initial temperature of an infrared temperature measuring point of the tail flame of the phase change engine monitored by the external thermometer, and recording the initial current of the infrared temperature measuring instrument at the moment.
And S320, receiving a second control signal sent by a second self-reset calibration switch, calculating the instantaneous average calibration temperature of the tail flame of the phase change engine according to the instantaneous temperature of the tail flame of the phase change engine sensed by the four collected temperature calibration sensors and the instantaneous temperature of the infrared temperature measuring point of the tail flame of the phase change engine monitored by the external thermometer, and recording the instantaneous current of the infrared thermometer at the moment.
Step S330, fitting a trend line of the actual correction temperature according to the calculated initial average calibration temperature and initial current of the phase change engine tail flame and the calculated instantaneous average calibration temperature and instantaneous current of the phase change engine tail flame, and calculating the accurate real-time temperature of the phase change engine tail flame according to a function expression of the trend line.
The initial average calibration temperature of the phase change engine tail flame is calculated by the following equation:
MeanT_1＝(T1_1+T2_1+T3_1+T4_1-min(T1_1，T2_1，T3_1，T4_1))/3 (4)
in formula (4), mean _1 represents the initial average calibration temperature of the phase change engine tail flame, and T1_1 is the first initial temperature of the phase change engine tail flame sensed by the first temperature calibration sensor; t2_1 is a second initial temperature of the phase change engine tail flame sensed by the second temperature calibration sensor; t3_1 is a third initial temperature of the phase change engine tail flame sensed by the third temperature calibration sensor; t4_1 is a fourth initial temperature of the phase change engine tail flame sensed by the fourth temperature calibration sensor; min (T1_1, T2_1, T3_1, T4_1) represents the minimum initial temperature among the four gas temperature sensors.
The instantaneous average calibration temperature of the phase change engine tail flame is calculated by the following formula:
MeanT_2＝(T1_2+T2_2+T3_2+T4_2-min(T1_2，T2_2，T3_2，T4_2))/3 (5)
in equation (5), MeanT — 2 represents the instantaneous average calibration temperature of the phase change engine tail flame; t1_2 is the first instantaneous temperature of the phase change engine tail flame sensed by the first temperature calibration sensor; t2_2 is a second instantaneous temperature of the phase change engine tail flame sensed by the second temperature calibration sensor; t3_2 is the third instantaneous temperature of the phase change engine tail flame sensed by the third temperature calibration sensor; t4_2 is the fourth instantaneous temperature of the phase change engine tail flame sensed by the fourth temperature calibration sensor; min (T1_2, T2_2, T3_2, T4_2) represents the minimum instantaneous temperature among the four gas temperature sensors.
The actual temperature after the phase change engine tail flame correction is calculated by the following formula:
(MeanT-MeanT_1)/(I-I_1)＝(MeanT_2-MeanT_1)/(I_2-1_1) (6)
in the formula (6), MeanT represents the corrected actual temperature value, and I represents the current value of the infrared thermometer at that time; MeanT _1 represents the initial average calibration temperature of the phase change engine tail flame, and MeanT _2 represents the instantaneous average calibration temperature of the phase change engine tail flame; i _1 represents the initial current of the phase change engine tail flame; i _2 represents the instantaneous current of the phase change engine tail flame.
According to the phase change engine tail flame temperature test control method provided by the embodiment, the temperature acquisition data graph shown in fig. 8 can be drawn through two times of data acquisition; the controller broadcasts and sends out the temperature process value MeanT in real time in a PDO mode through the CAN bus. Signals are connected into a computer by a USB-CAN conversion module (the model is Kvaser Leaf Light HS V2 in Sweden), the sampling frequency is set to be 20ms in CANKing software, and the temperature of the tail flame of the phase change engine CAN be recorded according to the time interval of 20ms and a temperature-time change curve CAN be drawn. In the embodiment, through analyzing and researching the recorded measurement data, the design of the phase change engine can be corrected, the propellant fuel ratio can be adjusted, the infrared radiation characteristic of the engine can be optimized, the limitation that only one temperature can be displayed in the past is overcome, and meanwhile the problem that cost waste of introducing millions of devices for collecting imports is solved.
Compared with the prior art, the phase change engine tail flame temperature testing device and the control method provided by the embodiment adopt the engine combustion chamber, the gas nozzle, the temperature calibration sensor, the infrared thermometer and the controller, collect the initial temperature and the instantaneous temperature of the phase change engine tail flame sensed by the plurality of gas temperature sensors through the controller, receive the initial temperature and the instantaneous temperature monitored by the infrared thermometer, and calculate the actual temperature of the phase change engine tail flame after correction; recording the temperature of the tail flame of the phase change engine according to the time interval of the set sampling frequency, drawing a temperature-time change curve, automatically calibrating the temperature collected by an infrared thermometer through a controller algorithm and control logic, and completely recording the temperature change in the ignition experiment process of the phase change engine; the algorithm of the temperature average value can eliminate the artificial deviation in the installation process; and the two times of sampling and calibration enable the calculated temperature to be more accurate and closer to the actual temperature. The phase change engine tail flame temperature testing device and the control method provided by the embodiment can automatically calibrate the measurement data of the infrared thermometer and record the process change of the tail flame temperature in real time; the temperature of the tail flame of the phase change engine is accurately measured, and the design of the phase change engine can be corrected, the propellant fuel ratio can be adjusted, the infrared radiation characteristic of the engine can be optimized and the like by analyzing and researching the measured data; the temperature averaging algorithm can eliminate the artificial deviation in the installation process more greatly.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A phase change engine tail flame temperature test control method is applied to a phase change engine tail flame temperature test device and is characterized in that the phase change engine tail flame temperature test device comprises an engine combustion chamber (10), a jet orifice (20), a temperature calibration sensor (30), an infrared thermometer (40) and a controller (50), wherein,
the gas jet (20) is communicated with the engine combustion chamber (10) and is used for jetting phase change engine tail flames;
the temperature calibration sensor (30) is arranged in a plurality, and the temperature calibration sensors (30) are circumferentially arranged at the outlet of the gas jet (20) and used for sensing the temperature of the tail flame of the phase change engine in all directions to calibrate the installation position of the phase change engine;
the infrared thermometer (40) is arranged in front of the engine combustion chamber (10) and used for monitoring the tail flame temperature of the tail flame infrared temperature measuring point of the phase change engine:
the controller (50) is respectively connected with the plurality of temperature calibration sensors (30) and the infrared thermometer (40) and is used for acquiring the initial temperature and the instantaneous temperature of the phase change engine tail flame sensed by the plurality of temperature calibration sensors (30), receiving the initial temperature and the instantaneous temperature monitored by the infrared thermometer (40) and calculating the actual temperature of the phase change engine tail flame after correction; recording the temperature of the tail flame of the phase change engine according to the time interval of the set sampling frequency and drawing a temperature-time change curve;
the phase change engine tail flame temperature test control method comprises the following steps:
acquiring initial temperature and instantaneous temperature of phase change engine tail flame sensed by a plurality of temperature calibration sensors;
receiving the initial temperature and the instantaneous temperature of an infrared temperature measuring point of the tail flame of the phase change engine monitored by an infrared thermometer;
calculating the corrected actual temperature of the tail flame of the phase change engine according to the acquired initial temperature and instantaneous temperature of the tail flame of the phase change engine sensed by the plurality of temperature calibration sensors and the received initial temperature and instantaneous temperature of the infrared temperature measuring point of the tail flame of the phase change engine monitored by the external temperature measuring instrument;
recording the temperature of the tail flame of the phase change engine according to the calculated actual temperature after the tail flame of the phase change engine is corrected and a time interval of a set sampling frequency, and drawing a temperature-time change curve graph;
the step of calculating the corrected actual temperature of the phase change engine tail flame according to the acquired initial temperature and instantaneous temperature of the phase change engine tail flame sensed by the plurality of temperature calibration sensors and the received initial temperature and instantaneous temperature of the phase change engine tail flame infrared temperature measurement point monitored by the external thermometer comprises the following steps:
receiving a first control signal sent by a first self-reset calibration switch, calculating initial average calibration temperature of the tail flame of the phase change engine according to the initial temperature of the tail flame of the phase change engine sensed by the four collected temperature calibration sensors and the initial temperature of an infrared temperature measuring point of the tail flame of the phase change engine monitored by the external thermometer, and recording the initial current of the infrared temperature measuring instrument at the moment;
receiving a second control signal sent by a second self-reset calibration switch, calculating the instantaneous average calibration temperature of the tail flame of the phase change engine according to the acquired instantaneous temperature of the tail flame of the phase change engine sensed by the four temperature calibration sensors and the received instantaneous temperature of the infrared temperature measuring point of the tail flame of the phase change engine monitored by the external thermometer, and recording the instantaneous current of the infrared temperature measuring instrument at the moment;
and fitting a trend line of the actual correction temperature according to the calculated initial average calibration temperature and initial current of the phase change engine tail flame and the instantaneous average calibration temperature and instantaneous current of the phase change engine tail flame, and calculating the accurate real-time temperature of the phase change engine tail flame according to a function expression of the trend line.
2. The phase change engine tail flame temperature test control method according to claim 1,
the initial average calibration temperature of the phase change engine tail flame is calculated by the following formula:
MeanT_1＝(T1_1+T2_1+T3_1+T4_1-min(T1_1，T2_1，T3_1，T4_1))/3
where MeanT _1 represents an initial average calibration temperature of the phase change engine tail flame, and T1_1 is a first initial temperature of the phase change engine tail flame sensed by the first temperature calibration sensor; t2_1 is a second initial temperature of the phase change engine tail flame sensed by the second temperature calibration sensor; t3_1 is a third initial temperature of the phase change engine tail flame sensed by the third temperature calibration sensor; t4_1 is a fourth initial temperature of the phase change engine tail flame sensed by the fourth temperature calibration sensor; min (T1_1, T2_1, T3_1, T4_1) represents the minimum initial temperature among the four gas temperature sensors;
the instantaneous average calibration temperature of the phase change engine tail flame is calculated by the following formula: MeanT _2 ═ (T1_2+ T2_2+ T3_2+ T4_2-min (T1_2, T2_2, T3_2, T4_2))/3
Where MeanT _2 represents the instantaneous average calibration temperature of the phase change engine tail flame; t1_2 is the first instantaneous temperature of the phase change engine tail flame sensed by the first temperature calibration sensor; t2_2 is a second instantaneous temperature of the phase change engine tail flame sensed by the second temperature calibration sensor; t3_2 is the third instantaneous temperature of the phase change engine tail flame sensed by the third temperature calibration sensor; t4_2 is the fourth instantaneous temperature of the phase change engine tail flame sensed by the fourth temperature calibration sensor; min (T1_2, T2_2, T3_2, T4_2) represents the minimum instantaneous temperature among the four gas temperature sensors;
the actual temperature after the phase change engine tail flame is corrected is calculated through the following formula:
(MeanT-MeanT_1)/(I-I_1)＝(MeanT_2-MeanT_1)/(I_2-I_1)
wherein MeanT represents the corrected actual temperature value, and I represents the current value of the infrared thermometer at that time; MeanT _1 represents the initial average calibration temperature of the phase change engine tail flame, and MeanT _2 represents the instantaneous average calibration temperature of the phase change engine tail flame; i _1 represents the initial current of the phase change engine tail flame; i _2 represents the instantaneous current of the phase change engine tail flame.
3. The phase change engine tail flame temperature test control method according to claim 1,
the temperature calibration sensor (30) adopts four gas temperature sensors which are circumferentially arranged in the upper, lower, left and right directions of the outlet of the gas nozzle (20).
4. The phase change engine tail flame temperature test control method according to claim 3,
the phase change engine tail flame temperature testing device also comprises a first self-resetting calibration switch (60) and a second self-resetting calibration switch (70),
the first self-reset calibration switch (60) and the second self-reset calibration switch (70) are connected to the positive input end of the switching value signal of the controller (50); the temperature calibration sensor (30) and the infrared thermometer (40) are connected to the analog quantity signal input end of the controller (50).
5. The phase change engine tail flame temperature test control method according to claim 4,
the phase change engine tail flame temperature testing device further comprises a USB-to-CAN module (80) and a terminal (90), wherein the controller (50) is connected with the terminal (90) through the USB-to-CAN module (80) and is used for broadcasting and sending the actual temperature obtained after the phase change engine tail flame correction is calculated to the terminal (90) in a PDO mode through a CAN bus in real time and recording the actual temperature through CANKing software.
6. The phase change engine tail flame temperature test control method according to claim 1,
the model of the infrared thermometer (40) is ABSD-3014 produced by Shandong Obo Saddy company.
7. The phase change engine tail flame temperature test control method according to claim 4,
the type of the gas temperature sensor is KL-H-T-2-2 produced by the Seaanke company; the self-reset calibration switch is manufactured by KN1A-112M of Vighua of Guizhou.
8. The phase change engine tail flame temperature test control method according to claim 1,
the controller (50) is an EPEC3724 programmable logic controller.
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