CN211785266U - System for realizing synchronous control of multiple targets in detonation experiment testing system - Google Patents
System for realizing synchronous control of multiple targets in detonation experiment testing system Download PDFInfo
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Abstract
The utility model relates to a system for realizing synchronous control of a plurality of targets in a deflagration experiment testing system, which comprises a shock tube, a premixed gas supply system, a fire retardant injection system, a flame signal acquisition system, a pressure signal acquisition system, a data acquisition system, a laser schlieren system, a high-pressure ignition system and a synchronous control system for controlling each system; the shock tube comprises a plurality of experiment pipelines and 1 visual observation window experiment section which are sequentially connected; the premixed gas supply system is communicated with the interior of the shock tube, generates premixed gas with a preset equivalence ratio and inputs the premixed gas into the shock tube; the fire retardant spraying system and the laser schlieren system are both connected with the visual observation window experiment section; the flame signal acquisition system and the pressure signal acquisition system are arranged on the side wall of each section of experiment pipeline; the high-voltage ignition system is connected with the end part of the shock tube and is used for ignition. The utility model discloses can wide application in safe science and technical field.
Description
Technical Field
The utility model belongs to the technical field of safe science and, a system for realizing a plurality of target synchro control in deflagration experiment test system is related to.
Background
The underground gas/air premixed gas deflagration of the coal mine brings great disasters to mine safety production, and meanwhile, the problems are also the classic problems and the front-edge problems researched by the mechanics and safety disciplines.
In recent years, researchers can classify the research methods into numerical simulation research and shock tube experimental research. At present, although numerical simulation research can reveal the flow phenomenon in the flame propagation process and is helpful for understanding the transition from laminar flame to turbulent flame, combustion instability, flame form change and the like, the calculation result of the method can be deviated due to the influence of an algorithm and a grid, so that the experimental research of a shock tube is still an irreplaceable research method for the problems.
At present, pressure and flame speed test systems are mostly adopted in shock tube experimental research, the methods can only provide single point source information in a premixed gas deflagration flow field, can only qualitatively analyze pressure peak values, the change trend of flame speed in a roadway and influence factors, and cannot be used for micro scientific problems such as shock waves, flame structures, barriers to flame acceleration mechanisms, flame retardant inhibition mechanisms and the like. Therefore, the traditional pressure and flame speed sensor test system must be replaced by a modern ultra-high-speed laser schlieren and transient spectrum test system, and the evolution process of the shock wave and the microstructure of the flame in the premixed gas deflagration process can be obtained. However, when the shock tube is matched with an ultra-high-speed laser schlieren and transient spectrum test system to perform a micro flow field test, the time scale control problems of a plurality of targets with large time difference are involved, such as the response time of electric spark ignition, the time of a shock wave front reaching an observation window, the time of a flame front reaching the observation window, the control of the response time of an inert flame retardant injection system, the response time of an electronic shutter of an ICCD (instantaneous spectrum charge coupled device) camera, the response time of a CCD (charge coupled device) electronic shutter of an ultra-high-speed camera. The time characteristics of the targets are from second to nanosecond, the time of the multiple targets needs to be coordinated for obtaining clear flow field microstructures and spectrum images, and the problem of synchronous control of a test system is solved.
Disclosure of Invention
To the problem that above-mentioned provided, the utility model aims at providing a realize among the detonation experiment test system a plurality of target synchro control's system, through the time characteristic of the different targets of analysis, provide a reasonable time delay control method, establish the basis for among the completion system in advance gas detonation process shock wave evolution and flame microstructure's test.
In order to achieve the purpose, the utility model adopts the following technical proposal: a system for realizing synchronous control of a plurality of targets in a detonation experiment testing system comprises a shock tube, a premixed gas supply system, a flame retardant injection system, a flame signal acquisition system, a pressure signal acquisition system, a data acquisition system, a laser schlieren system, a high-pressure ignition system and a synchronous control system; the shock tube comprises a plurality of experiment pipelines and 1 visual observation window experiment section which are sequentially connected; the premixed gas supply system is communicated with the interior of the shock tube and used for generating premixed gas with a preset equivalence ratio according to experimental requirements and inputting the premixed gas into the shock tube; the flame retardant injection system is communicated with the interior of the shock tube through an inert medium injection hole arranged on the visual observation window experimental section and is used for researching the influence of flame retardant parameters on the gas explosion propagation characteristic and the DDT process; the flame signal acquisition system and the pressure signal acquisition system are arranged on the side wall of each section of the experimental pipeline and are used for measuring the whole-course pressure in the shock tube and the rule of flame propagation speed, and the measurement result is sent to the synchronous control system through the data acquisition system; the laser schlieren system is arranged at the experimental section of the visual observation window and is used for measuring the distribution image of the typical free radical concentration and temperature of the explosion flow field; the high-pressure ignition system is connected with the end part of the experimental pipeline of the shock tube and is used for igniting the premixed gas in the shock tube; the synchronous control system is used for synchronously controlling the fire retardant injection system, the flame signal acquisition system, the pressure signal acquisition system, the laser texture system and the high-pressure ignition system.
Furthermore, each experimental pipeline in the shock tube adopts a square pipeline with the cross section shape of 200mm multiplied by 200mm, the length of each experimental pipeline is 2500mm, the total length is 14 sections, and the total length is 35 m; the visual observation window experiment section adopts two K9 quartz organic glasses with the diameter of 200mm, and the length of the glass is 1000 mm.
Further, the premixed gas supply system comprises a premixing system, a vacuum pumping system, a first control cabinet and a second control cabinet; the premixing system comprises a premixing tank, and the premixing tank is connected with the first control cabinet through a ball valve and a high-pressure air pump line; the vacuum pumping system comprises a rotary vane pump and a roots pump, the rotary vane pump and the roots pump are communicated with the interior of the shock tube through high-pressure gas pump lines, and control ends of the rotary vane pump and the roots pump are connected with the first control cabinet and the second control cabinet and are used for pumping vacuum and charging gas for the shock tube according to control signals of the first control cabinet and the second control cabinet; and the output port of the first control cabinet is respectively connected with the air compressor, the methane gas cylinder and the second control cabinet and is used for respectively filling methane and air into the premixing tank according to a predetermined volume percentage according to a partial pressure law.
Furthermore, the fire retardant injection system comprises a nitrogen storage tank, an electromagnetic valve and a nozzle, wherein the outlet end of the nitrogen storage tank is connected with the nozzle through an injection pipeline, the nozzle is arranged in an inert gas injection hole arranged in an experimental section of a visual observation window in the shock tube, and the electromagnetic valve is arranged on the injection pipeline and controlled by the synchronous control system; the flame signal acquisition system comprises a photodiode, and the photodiode is used for leading in an optical signal generated by flame through an optical fiber, converting the optical signal into an electric signal and sending the electric signal to the synchronous control system through the data acquisition system.
Furthermore, the pressure signal acquisition system comprises 16 piezoelectric pressure sensors, each piezoelectric pressure sensor is arranged on each experimental pipeline of the shock tube at equal intervals, and pressure signals acquired by each piezoelectric pressure sensor are sent to the data acquisition system through a data line.
Furthermore, the laser schlieren system comprises a pulse laser emission platform, two concave spherical reflectors, an ultra-high speed camera and a transient spectrometer; the two concave spherical reflectors are symmetrically arranged on two sides of a visual observation window experiment section of the shock tube, and laser emitted by the pulse laser emission platform is reflected by the two concave spherical reflectors and then is respectively subjected to image and spectrum collection by the ultra-high speed camera and the transient spectrometer.
Furthermore, the synchronous control system comprises a signal function generator, a time delayer and a solid relay; the output port of the function signal generator is connected with the input port of the time delayer, the output ports of the time delayer are respectively connected with the ultra-high-speed camera, the transient spectrometer, the solid relay and the data acquisition system, and the output port of the solid relay is connected with the flame retardant injection system and the high-pressure ignition system.
Because the utility model discloses take above technical scheme, it has following advantage: 1. the utility model discloses the deflagration experiment test system of putting up, including fire retardant injection system, flame signal collection system, pressure signal collection system, multichannel high resolution data collection system, laser schlieren system, high-pressure ignition system and synchronous control system, can study gas/air in the shock tube more accurately and mix the gas explosion in-process shock wave formation process, maximum pressure and flame propagation speed and flame and inert fire retardant interact's flow field evolution image and study, the research result is more comprehensive accurate. 2. The utility model discloses the shock tube includes end to end's a plurality of experiment pipelines and 1 visual observation window experiment section, has realized when gathering shock tube pressure, gathers flame image through visual observation window. 3. The utility model discloses thoughts that the premixing system adopted the jar outer premixing, and the premixing gas can be after the intensive mixing again enter test system, avoided because the influence that the premixing gas mixes the inadequately and cause the experimental result. 4. The utility model discloses evacuation system includes rotary vane pump and lobe pump, through mutually supporting of two pumps, carries out the evacuation to the shock tube, has guaranteed the inside vacuum of shock tube, has further guaranteed the accuracy of result. 5. The utility model discloses at first carry out the analysis to the time characteristic of each variable among the explosion experiment test system, through studying electric spark response time, data acquisition system response time, laser instrument response time, fire retardant injection system response time, CCD ICCD shutter response time etc. among the experiment test system, realized the time relation formula to the synchro control of a plurality of big time difference targets among the explosion experiment test system. 6. The utility model discloses an experiment is tested many times to the response time of high-pressure ignition system and fire retardant injection system to its average value carries out synchronous control as the basis, and the synchronous control result accords with actual conditions more. To sum up, the utility model discloses can the wide application in gaseous detonation technology field is mixed in advance to gas/air in the pit.
Drawings
FIG. 1 is an experimental schematic diagram of a multi-objective synchronous control system in a deflagration experimental test system of the present invention;
FIG. 2 is a schematic diagram of the experimental scheme for synchronously controlling the high-pressure ignition system and the fire retardant injection system of the utility model;
FIG. 3 shows the discharge response time t of the high-voltage ignition system of the present invention1A schematic diagram of a measurement protocol;
FIG. 4 shows the response time t of the flame retardant injection system2A schematic diagram of a measurement protocol;
FIG. 5a and FIG. 5b are the discharge response time t of the high-voltage ignition system of the present invention1And (6) actually measuring data.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
In order to more accurately obtain the flow field evolution image of the shock wave forming process, the maximum pressure and the flame propagation speed and the interaction of the flame and the inert flame retardant in the gas/air premixed gas deflagration process in the explosion shock tube. The utility model discloses a time response characteristic and the control mode of a plurality of targets in the analysis shock tube test system utilize equipment such as hypervelocity camera, photomultiplier, time delay ware, solid state relay, charge amplifier and data acquisition system, provide a gas/air in the shock tube mixes gas detonation high pressure ignition system response time and inert medium fire retardant injection system response time's test method in advance.
As shown in fig. 1, the utility model provides a system for realizing a plurality of target synchro control in deflagration experiment test system, it includes shock tube 1, mixes gaseous feed system 2, fire retardant injection system 3, flame signal collection system 4, pressure signal collection system 5, data acquisition system 6, laser schlieren system 7, high pressure ignition system 8 and synchro control system 9 in advance. The shock tube 1 comprises a plurality of experiment pipelines and 1 visual observation window experiment section which are sequentially connected; the premixed gas supply system 2 is communicated with the interior of the shock tube 1 and is used for generating premixed gas with a preset equivalence ratio according to experimental requirements and inputting the premixed gas into the shock tube 1; the flame retardant injection system 3 is connected with the visual observation window experiment section and is used for researching the influence of flame retardant parameters on the gas explosion propagation characteristic and the DDT process; the flame signal acquisition system 4 and the pressure signal acquisition system 5 are arranged on the side wall of each section of experimental pipeline and are used for measuring the whole-course pressure and flame propagation speed rule in the shock tube 1, and the measurement result is sent to the synchronous control system 9 through the data acquisition system 6; the laser schlieren system 7 is connected with the visual observation window experiment section through a multi-channel optical fiber and is used for measuring the distribution image of the typical free radical concentration and temperature of the explosion flow field, and further understanding the nature of gas explosion and the mechanism of the inhibition effect of the flame retardant from the elementary reaction layer; the high-voltage ignition system 8 is connected with the end part of the shock tube 1 and is used for igniting the premixed gas in the shock tube 1; the synchronous control system 9 is used for synchronously controlling the fire retardant spraying system 3, the flame signal acquisition system 4, the pressure signal acquisition system 5, the laser schlieren system 7 and the high-pressure ignition system 8.
Furthermore, each experimental pipeline in the shock tube 1 adopts a square pipeline with the cross section shape of 200mm multiplied by 200mm, and the length of each experimental pipeline is 2500mm, the shock tube of the utility model comprises 14 experimental pipelines, and the total length is 35 m; the experimental section of the visual observation window is two pieces of K9 quartz organic glass with the diameter of 200mm, and the length of the organic glass is 1000 mm.
Further, the visual observation window experiment section of the shock tube 1 is also communicated with an explosion venting bin 10, and the explosion venting bin 10 is connected with a pump 11 through an air pump line.
Further, the premixed gas supply system 2 includes a premixing system 21, an evacuation system 22, a control cabinet 23 and a control cabinet 24. The premixing system 21 adopts an out-of-tank premixing concept and comprises a premixing tank 211, wherein the premixing tank 211 is connected with the control cabinet 23 through a ball valve 212 and a high-pressure gas pump line; the vacuum-pumping system 22 comprises a rotary vane pump and a roots pump, the rotary vane pump and the roots pump are communicated with the interior of the shock tube 1 through a high-pressure gas pump line, and the control ends of the rotary vane pump and the roots pump are connected with the control cabinet 23 and the control cabinet 24 and are used for vacuumizing and inflating the shock tube 1 according to control signals of the control cabinet 23 and the control cabinet 24; the output port of the control cabinet 23 is connected with the air compressor 25, the methane gas cylinder 26 and the control cabinet 24 respectively, and is used for filling methane and air into the premixing tank 211 according to the dalton partial pressure law and preset volume percentages respectively, and filling the premixed gas into the shock tube 1 for standby as experimental gas after the premixed gas is static for 6-8 hours.
Further, the air pumping speed of the rotary vane pump is 90m3H, the ultimate vacuum degree is 0.7Pa, and the pumping speed of the roots pump is 500m3The ultimate vacuum degree is 0.4 Pa. At the initial stage of vacuumizing the shock tube 1 (the initial pressure in the shock tube of the system is 1 atmospheric pressure), the rotary vane pump is started, and when the pressure is reduced to a certain magnitude (usually 0.01 atmospheric pressure), the rotary vane pump is stopped, and the roots pump is started at the same time.
Further, as shown in fig. 2, the fire retardant spraying system 3 includes a nitrogen storage tank 31, an electromagnetic valve 32 and a nozzle 33, wherein an outlet end of the nitrogen storage tank 31 is connected with the nozzle 33 through a spraying pipeline, the nozzle 33 is disposed in an inert gas spraying hole disposed in the experimental section of the visual observation window in the shock tube 1, and the electromagnetic valve 32 is disposed on the spraying pipeline and controlled by the synchronous control system 9.
Further, the flame signal collection system 4 includes a photodiode for guiding the light signal generated by the flame through the optical fiber, converting the light signal into an electrical signal, and transmitting the electrical signal to the data collection system 6.
Further, the pressure signal acquisition system 5 includes 16 piezoelectric pressure sensors, each of the piezoelectric pressure sensors is disposed on each of the experimental pipelines of the shock tube 1 at equal intervals, and the pressure signals acquired by each of the piezoelectric pressure sensors are transmitted to the multi-channel high-resolution data acquisition system 6 through a data line. The sampling frequency of the piezoelectric pressure sensor is 500KHz, and the maximum measuring range is 6.9 MPa.
Further, the data acquisition system 6 adopts a multi-channel high-resolution data acquisition system, and the maximum sampling frequency is 20 MHz.
Further, the laser schlieren system 7 comprises a pulse laser emitting platform 71, concave spherical reflecting mirrors 72-73, an ultra-high speed camera 74 and a transient spectrometer 75; the concave spherical reflector 72 and the concave spherical reflector 73 are symmetrically arranged on two sides of the visual observation window experiment section of the shock tube 1, and laser emitted by the pulse laser emission platform 71 is reflected by the concave spherical reflector 72 and the concave spherical reflector 73, then is respectively subjected to image and spectrum collection by the ultra-high speed camera 74 and the transient spectrometer 75, and is uploaded to the synchronous control system 9. The ultra-high speed camera 74 and the transient spectrometer 75 both refer to devices with an electronic shutter response time on the order of nanoseconds, and preferably, in the present invention, the ultra-high speed camera 74 employs a CCD camera, and the transient spectrometer 75 employs a transient spectrum ICCD camera.
Further, as shown in fig. 2, the high-voltage ignition system 8 includes a capacitor 81 and a diode 82, the anode of the capacitor 81 and the cathode of the diode 82 are connected with a 220V power supply, the cathode of the capacitor 81 and the anode of the diode 82 are connected with a ground, the anode of the capacitor 81 is used as the high-voltage anode of the high-voltage ignition system, a discharge is generated by the ground and the low-voltage anode output by the synchronous control system 9, an air medium between the high-voltage anode and the ground is broken through, and the ignition of the gas-air premixed gas is completed.
Further, the synchronous control system 9 includes a function signal generator 91, a time delay 92, and a solid-state relay 93. An output port of the function signal generator 91 is connected to an input port of the time delay 92, output ports of the time delay 92 are respectively connected to the ultra-high speed camera 74, the transient spectrometer 75, the solid relay 93 and the data acquisition system 6, and output ports of the solid relay 93 are connected to the flame retardant injection system 3 and the high-pressure ignition system 8.
As shown in fig. 2, the working principle of the high-pressure ignition system 8 and the fire retardant injection system 3 in the system of the present invention is: the function signal generator 91 generates a standard TTL signal (e.g., level TTL0) and sends it to the input of the time delay 92 (the present invention adopts DG645), and the two channels CH1 and CH2 at the output of the time delay 92 generate level TTL1 and TTL2, respectively; the level TTL1 controls the low-voltage anode and the ground wire in the high-voltage ignition system 8 to generate discharge through the solid-state relay 93, and the energy of the level TTL1 can break down the medium between the high-voltage anode and the ground wire in the system to realize high-voltage discharge; the level TTL2 starts the fire retardant injection system 3 through the solid-state relay 93 to inject CO2/N2/H2O, and the like.
Based on above-mentioned multi-target synchronous control system in gas explosion experimental system in advance, the utility model provides a method for realizing multi-target synchronous control in explosion experimental test system, it includes following step:
1) and analyzing the time characteristics of all variables in the explosion experiment test system, and determining all time variables and time relational expressions which need to be synchronously controlled.
In order to obtain a better flow field image of interaction of flame and a flame retardant through an ultra-high speed schlieren system, time characteristics of all variables in an experimental system need to be analyzed, and the purpose is to enable the flame retardant to be just sprayed to act with the flame and simultaneously open a CCD (charge coupled device) and an ICCD (integrated circuit CD) electronic shutter when the flame reaches an observation window so as to obtain microscopic information of an explosion flow field. The time variables required for synchronous control in the whole set of experimental system are shown in table 1, and the analysis shows that the time relation formula for realizing synchronous control is as follows:
t1+t2+t3＝t4+t5+td＝t6＝t7(1)
here, it is still necessary to analyze the formula (1) to define T1＝t1+t2+t3、T2＝t4+t5+tdIf T1>T2Delay time t of channel settingdIf the flame is too small, the flame retardant injection system 3 starts to work before the flame does not reach the observation window, and the inert medium interferes with the components of the premixed gas near the observation window to change the microscopic information of the explosion flow field; if T1<T2Delay time t of channel settingdIf the flame intensity is too large, the flame retardant spraying system still does not work after the flame reaches the observation window, and the analysis of the flame retardant effect by the inert medium is influenced.
TABLE 1 synchronous control of variables in an experimental system
2) And testing the response time from the discharge of the low-voltage anode and the ground wire to the breakdown of the medium between the high-voltage anode and the ground wire in the high-voltage ignition system to obtain the average value of the response time.
As shown in fig. 3, in order to realize the synchronous control of a plurality of targets in the experimental system, the utility model discloses an among the high-pressure ignition system is confirmed in the experiment, the low pressure positive pole produces with the ground wire and discharges to the response time who punctures medium between high-pressure positive pole and ground wire, and the test scheme is as follows:
firstly, a high-pressure ignition experiment system is built: the experimental system comprises a function signal generator, a solid-state relay, a high-pressure ignition system, a flame sensor and an oscilloscope (such as DH 5960); the output channel of the function signal generator is respectively connected with the input ends of the solid-state relay and the oscilloscope, the output end of the solid-state relay is connected with the high-pressure ignition system, the high-pressure ignition system comprises an ignition device, an ignition end and an ignition electrode, the ignition device is respectively connected with the solid-state relay and the ignition end, and the ignition end is arranged on the experiment table through a nylon flange; the flame sensor is fixed near the ignition electrode through a bracket, the flame sensor is connected with the other input end of the oscilloscope, and the output end of the oscilloscope is connected with the computer terminal. The flame sensor adopts a flame speed measuring optical fiber and a photodiode PD which are integrated into a whole or a flame speed measuring optical fiber and a photomultiplier PMT which are integrated into a whole.
Secondly, starting the function signal generator, and respectively recording the time t of starting the solid-state relay by TTL signals generated by the function signal generator by adopting an oscilloscope11And the time t of the output signal of the flame sensor12。
Thirdly, starting the moment t of the solid-state relay according to the TTL signal generated by the function signal generator recorded by the oscilloscope11And the time t of the output signal of the flame sensor12And calculating the response time t from the discharge of the low-voltage anode and the ground wire to the breakdown of the medium between the high-voltage anode and the ground wire in the high-voltage ignition system1＝t12-t11；
And fourthly, repeating the test process (namely the steps II to III) to obtain the average value of the N times of experiments.
3) And testing the working response time of the fire retardant injection system to obtain the average value of the working response time of the fire retardant injection system.
As shown in fig. 4, the method for testing the response time of the fire retardant spraying system comprises the following steps:
covering a piece of printing paper on an inert medium injection hole in a visual observation window experiment section of a shock tube 1, and shooting a printing paper motion track through an organic glass observation window;
secondly, generating a standard TTL level by using a function signal generator, dividing two paths of signals after a time delay, and simultaneously acting on the solid-state relay and an external trigger port of the CCD camera;
thirdly, respectively recording the external trigger time t of the CCD camera by adopting an oscilloscope21And a printing paper movement time t22Then t is2＝t22-t21The motion moment of the printing paper can be determined according to the number of frames of the images shot at high speed after the flame retardant is sprayed and the interval time of the number of the frames;
and fourthly, repeating the test process to obtain the average value of the N experiments.
4) And measuring the whole-course pressure in the shock tube 1 and the flame propagation speed rule by adopting a flame signal acquisition system and a pressure signal acquisition system to obtain the time from the flame to the visual observation window.
5) And obtaining the time for triggering the transient spectrometer and the ultrahigh-speed camera according to the time relation in the step 1) and the obtained discharge response time of the high-pressure ignition system, the response time of the flame retardant injection system and the time for the flame to move to the visual observation window, so that a plurality of targets simultaneously act at the same time.
Example (b): in this example, 8 sets of tests were performed on the response time of the high-voltage ignition system.
As shown in fig. 5, the signal is a measured signal of response time of the high voltage ignition system, wherein the ignition voltage is 5000V, the sampling frequency of the data acquisition card is 1MHz, the sensitivity of the flame signal is 1mv/mv, the TTL signal is 10mv/mv, the triggering mode is signal triggering, the 07 channel signal is a TTL level signal, and the 09 channel signal is an electric spark signal. The above experiment was repeated and the data are shown in table 2:
TABLE 2 high-pressure ignition system discharge response time t1Experimental data
| Experimental number | Response time t1/μs | Experimental number | Response time t1/μs |
| 1 | 26 | 5 | 23 |
| 2 | 24 | 6 | 24 |
| 3 | 22 | 7 | 20 |
| 4 | 21 | 8 | 22 |
The average value of the discharge response time of the high-voltage ignition system measured by 8 groups of experiments is 22.75 mu s, the intensity of electric spark illumination generated by discharge is between 500mv and 900mv, and the flame test system of the embodiment has interference signals, special waveform and amplitude of about 275 mv.
In the embodiment, 6 groups of tests are carried out on the response time of the inert medium fire retardant injection system, the average value of the response time of the inert medium fire retardant injection system obtained by the 6 groups of tests is 4.492ms, and each group of experimental data is given in table 3.
TABLE 3 inert media flame retardant injection system response time t2Experimental data
| Experimental number | Shooting speed/s-1 | Number of photo frames | Response time t2/μs |
| 1 | 4000 | N19 | 4500 |
| 2 | 4000 | N20 | 4750 |
| 3 | 8000 | N36 | 4375 |
| 4 | 8000 | N38 | 4625 |
| 5 | 10000 | N45 | 4400 |
| 6 | 10000 | N44 | 4300 |
Above-mentioned each embodiment only is used for explaining the utility model discloses, wherein structure, connected mode and the preparation technology etc. of each part all can change to some extent, all are in the utility model discloses equal transform and improvement of going on technical scheme's the basis all should not exclude outside the protection scope of the utility model.
Claims (9)
1. A system for realizing synchronous control of a plurality of targets in a detonation experiment testing system is characterized in that: the system comprises a shock tube, a premixed gas supply system, a flame retardant injection system, a flame signal acquisition system, a pressure signal acquisition system, a data acquisition system, a laser schlieren system, a high-pressure ignition system and a synchronous control system;
the shock tube comprises a plurality of experiment pipelines and 1 visual observation window experiment section which are sequentially connected;
the premixed gas supply system is communicated with the interior of the shock tube, generates premixed gas with a preset equivalence ratio and inputs the premixed gas into the shock tube;
the flame retardant injection system is communicated with the interior of the shock tube through an inert medium injection hole arranged on the visual observation window experimental section and is used for researching the influence of flame retardant parameters on the gas explosion propagation characteristic and the DDT process;
the flame signal acquisition system and the pressure signal acquisition system are arranged on the side wall of each section of the experimental pipeline, the pressure in the whole course of the shock tube and the rule of flame propagation speed are measured, and the measurement result is sent to the synchronous control system through the data acquisition system;
the laser schlieren system is arranged at the experimental section of the visual observation window and is used for measuring the distribution image of the typical free radical concentration and temperature of the explosion flow field;
the high-pressure ignition system is connected with the end part of an experimental pipeline of the shock tube and is used for igniting premixed gas in the shock tube;
the synchronous control system is connected with the flame retardant injection system, the flame signal acquisition system, the pressure signal acquisition system, the laser texture system and the high-pressure ignition system.
2. A system for achieving synchronous control over multiple objectives in a deflagration test system according to claim 1, wherein: each experimental pipeline in the shock tube adopts a square pipeline with the cross section shape of 200mm multiplied by 200mm, the length of each experimental pipeline is 2500mm, the total length is 14 sections, and the total length is 35 m; the visual observation window experiment section adopts two K9 quartz organic glasses with the diameter of 200mm, and the length of the glass is 1000 mm.
3. A system for achieving synchronous control over multiple objectives in a deflagration test system according to claim 1, wherein: the premixed gas supply system comprises a premixing system, a vacuumizing system, a first control cabinet and a second control cabinet; the premixing system comprises a premixing tank, and the premixing tank is connected with the first control cabinet through a ball valve and a high-pressure air pump line; the vacuum pumping system comprises a rotary vane pump and a roots pump, the rotary vane pump and the roots pump are communicated with the interior of the shock tube through a high-pressure gas pump line, and the control ends of the rotary vane pump and the roots pump are connected with the first control cabinet and the second control cabinet; and the output port of the first control cabinet is respectively connected with the air compressor, the methane gas cylinder and the second control cabinet.
4. A system for achieving synchronous control over multiple objectives in a deflagration test system according to claim 3, wherein: the air pumping speed of the rotary vane pump is 90m3H, the ultimate vacuum degree is 0.7Pa, and the pumping speed of the roots pump is 500m3The ultimate vacuum degree is 0.4 Pa.
5. A system for achieving synchronous control over multiple objectives in a deflagration test system according to claim 1, wherein: the flame retardant injection system comprises a nitrogen storage tank, an electromagnetic valve and a nozzle, wherein the outlet end of the nitrogen storage tank is connected with the nozzle through an injection pipeline, the nozzle is arranged in an inert gas injection hole formed in an experimental section of a visual observation window in a shock tube, and the electromagnetic valve is arranged on the injection pipeline and electrically connected with the synchronous control system.
6. A system for achieving synchronous control over multiple objectives in a deflagration test system according to claim 1, wherein: the flame signal acquisition system comprises a photodiode, and the photodiode converts an optical signal into an electric signal and sends the electric signal to the synchronous control system through the data acquisition system.
7. A system for achieving synchronous control over multiple objectives in a deflagration test system according to claim 1, wherein: the pressure signal acquisition system comprises 16 piezoelectric pressure sensors, each piezoelectric pressure sensor is arranged on each experimental pipeline of the shock tube at equal intervals, and pressure signals acquired by each piezoelectric pressure sensor are sent to the data acquisition system through a data line.
8. A system for achieving synchronous control over multiple objectives in a deflagration test system according to claim 1, wherein: the laser schlieren system comprises a pulse laser emission platform, two concave spherical reflectors, an ultra-high speed camera and a transient spectrometer; the two concave spherical reflectors are symmetrically arranged on two sides of a visual observation window experiment section of the shock tube, and laser emitted by the pulse laser emission platform is reflected by the two concave spherical reflectors and then is respectively subjected to image and spectrum collection by the ultra-high speed camera and the transient spectrometer.
9. A system for achieving synchronous control over multiple objectives in a deflagration test system according to claim 8, wherein: the synchronous control system comprises a signal function generator, a time delayer and a solid relay; the output port of the signal function generator is connected with the input port of the time delayer, each output port of the time delayer is respectively connected with the ultra-high-speed camera, the transient spectrometer, the solid relay and the data acquisition system, and the output port of the solid relay is connected with the flame retardant injection system and the high-pressure ignition system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020073052.2U CN211785266U (en) | 2020-01-14 | 2020-01-14 | System for realizing synchronous control of multiple targets in detonation experiment testing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122653A (en) * | 2020-01-14 | 2020-05-08 | 华北科技学院 | System and method for realizing synchronous control of multiple targets in detonation experiment testing system |
| CN113154962A (en) * | 2021-03-18 | 2021-07-23 | 北京理工大学 | Large-size visual cylindrical detonation experimental device and detonation experimental optical recording method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122653A (en) * | 2020-01-14 | 2020-05-08 | 华北科技学院 | System and method for realizing synchronous control of multiple targets in detonation experiment testing system |
| CN111122653B (en) * | 2020-01-14 | 2024-05-31 | 华北科技学院 | System and method for realizing synchronous control of multiple targets in deflagration experiment test system |
| CN113154962A (en) * | 2021-03-18 | 2021-07-23 | 北京理工大学 | Large-size visual cylindrical detonation experimental device and detonation experimental optical recording method |
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