CN108333385A - A kind of ion probe velocity-measuring system measuring Gaseous Detonation speed - Google Patents
A kind of ion probe velocity-measuring system measuring Gaseous Detonation speed Download PDFInfo
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- CN108333385A CN108333385A CN201810115629.9A CN201810115629A CN108333385A CN 108333385 A CN108333385 A CN 108333385A CN 201810115629 A CN201810115629 A CN 201810115629A CN 108333385 A CN108333385 A CN 108333385A
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- probe
- ion
- detonation
- processing circuit
- ion probe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/08—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring variation of an electric variable directly affected by the flow, e.g. by using dynamo-electric effect
Abstract
The invention discloses a kind of ion probe velocity-measuring systems measuring Gaseous Detonation speed, including ion probe, signal processing circuit, data acquisition recorder；Ion probe is made of copper wire probe, alundum tube, stainless steel sleeve pipe, pedestal etc.；The output end of each ion probe is connect with some input terminal of signal processing circuit respectively, and quantity is unrestricted；Each channel of signal processing circuit is parallel with one another, and function is consistent, is powered by 24V DC power supplies；When detonation wave front reaches probe, corresponding probe circuit is connected, and the capacitance repid discharge of branch road is to generate voltage pulse signal；The voltage signal that all branches generate accesses the single channel of data acquisition recorder, at the time of as detonation wave is to tat probe at the time of pulse signal occurs；The time difference finally occurred according to the spacing of different probe and signal calculates the mean propagation velocity of the flame between two neighboring probe；Present system is at low cost, can accurately measure premixed gas detonation velocity of wave propagation in stainless steel tube.
Description
Technical field
The present invention relates to Explosion measurement technical fields, and in particular to it is a kind of measure Gaseous Detonation speed ion probe test the speed
System.
Background technology
When major accident occurs for PWR nuclear power plant, the zirconium cladding of reactor core is generated greatly by steam or air oxidation
The hydrogen of amount.In addition, if reactor core fusant falls to reactor cavity, fusant and coagulation soil interaction will generate a large amount of again
Hydrogen or carbon monoxide.There may be flammable mixtures after these gases are mixed with the air of surrounding and steam, encounter electricity
Smoulder will occur for spark or heat source.And the combustion flame is extremely unstable, if there are barriers in flame transmission path, swashs
The turbulent flow risen causes combustion rate increase, propagating flame constantly to accelerate.Under suitable conditions, this will cause detonation to be converted into
Detonation.And the enormous impact force that detonation generates will cause the containment of nuclear power plant to rupture, and radioactive substance is caused to leak into
External environment threatens public security.In order to study the mechanism of production and propagation of Gaseous Detonation, the accurate detonation rate that measures becomes gas
Indispensable technological means in phase Detonation Experiments.
The common technological means of detonation rate is measured in Gaseous Detonation Physical Experiment has electric probe velocity-measuring system, optical fiber to visit
Needle velocity-measuring system, high-speed camera test the speed.
Optical fiber probe is in such a way that direct measuring shock waves reach the fixed measuring point time come indirect measuring shock waves speed
Degree.Its probe is generally made of the gradient silica fibre and metal sleeve of end face coating.Measuring principle is when shock front arrives
Optical signal is will produce when up to optical fiber probe end face, is transformed to electric signal after being transmitted through the optical fiber to photodetector, then by oscillograph
Record is it is known that at the time of shock wave or film flying are to tat probe.The advantages of this method is indirect non-cpntact measurement.The disadvantage is that
It is not suitable for Gaseous Detonation in stainless steel tube, because to arrange multiple optical fiber probes, then needs to open up multiple microlens windows, lens
It is easy to rupture due to detonation impact force at sealing between window and stainless steel tube.In addition, this method is to the bright and clean of lens
It spends more demanding, is not suitable for the scene with black smoke in Detonation Tube.
The operation principle that high-speed camera tests the speed is that form and the position of pipeline flame are recorded by camera shooting, to obtain fire
Flame speed.The advantages of this method is indirect non-cpntact measurement, and simple system.The disadvantage is that involving great expense, and it is not suitable for stainless
Gaseous Detonation tachometric survey in steel pipe.
The ion probe velocity measuring technique that the present invention uses belongs to one kind of electric probe velocity measuring technique.Measuring principle is flammable
Admixture of gas increasing temperature and pressure under the compression of leader shock waves generates a large amount of free radical after automatic ignition in chemical reaction zone
Or ion, when detonation wave front reaches probe, probe circuit is connected and electric signal is reached data collecting system, to generate
Voltage pulse signal, at the time of as detonation wave is to tat probe at the time of signal occurs.Finally according to the spacing of different probe and
The time difference that signal occurs calculates the mean propagation velocity of the detonation wave between two neighboring probe.
Invention content
The purpose of the present invention is overcome the deficiencies of the prior art and provide a kind of ion probe survey measuring Gaseous Detonation speed
Speed system is a kind of low cost, multiple probe pulse signals is acquired merely with single channel capture card, stainless to accurately measure
The method of premixed gas detonation velocity of wave propagation in steel pipe.
In order to achieve the above object, the present invention adopts the following technical scheme that：
A kind of ion probe velocity-measuring system measuring Gaseous Detonation speed, including ion probe, connect with ion probe
Signal processing circuit and the data acquisition recorder being connect with signal processing circuit；
The ion probe part is located in Detonation Tube, including is provided with the alundum tube 2 of doubled via, a pair of of copper wire probe 1
It is inserted into the doubled via of alundum tube 2, both ends head is stretched out, and 2 external concentric of alundum tube is provided with stainless steel sleeve pipe 3；Copper wire probe 1 with
It is filled using industrial insulating cement in gap between gap and alundum tube 2 and stainless steel sleeve pipe 3 between 2 doubled via of alundum tube；It is described
The length of alundum tube 2 and stainless steel sleeve pipe 3 is according to the wall thickness change of detonation tube wall 4；The probe output end 7 of the ion probe
It is connected with signal processing circuit；
The signal processing circuit provides excitation using 24V DC voltages, is formed by No. 24 probe branch circuit parallel connections, each to visit
Needle branch all same, including protective resistance, diode, ion probe and the 0.001uF in parallel with diode and ion probe
Capacitance, the output end of signal processing circuit are the voltage at the both ends resistance R0, and wherein the one end resistance R0 is grounded, and the other end accesses data
Acquisition and recording instrument；When detonation wave front passes through some ion probe, the branch conducting which is connected, branch road
Capacitance discharges rapidly, and to generate pulse voltage at the both ends resistance R0, which is recorded by data acquisition recorder；Due to using
The single channel of parallel circuit design, signal processing circuit output end and data logger connects；
No. 24 probe branch road ion probe is arranged in flame acceleration section and detonation section；24 ion probes respectively with
Input terminal in 24 branches of signal processing circuit is connected, when flame often passes through an ion probe, data acquisition recorder
A voltage pulse signal is generated, the time difference occurred according to the spacing of adjacent ions probe and successive pulse signals can
Calculate the mean propagation velocity of the flame between two neighboring ion probe.
No. 24 probe branch road ion probe is equally spaced 6 in the flame acceleration section of 1.2m long, in 8.8m long
Detonation section arrange 18.
The corundum pipe outside diameter is 4mm, a diameter of 1mm of interior doubled via；A diameter of 1mm of the copper wire probe 1, two
End head stretches out 5mm；The internal diameter of the stainless steel sleeve pipe 3 is 4.2mm, thickness 1mm.
The resistance value of the protective resistance is 1000k Ω, and the resistance value of resistance R0 is 20k Ω.
Compared to the prior art compared with the present invention has following advantage：
1. cost is relatively low.The component of material and corresponding signal processing circuit used by probe itself is cheap,
Purchase channel is convenient；
2. signal acquisition mode is simple.Due to using parallel circuit design, signal output to be by single channel capture card record
It can.Avoid the disadvantage that Circuit Design of Multi-channel Data is complicated, conducting wire is various, signal interference is serious.
3. signal response is fast, high resolution.The momentary capacitance that probe is connected can start to discharge, and the response time is nanosecond
Grade.Due to being much smaller than detonation wave battle array using the time of resistance R0 smaller smaller capacitance 0.001uF and resistance value, capacitance electric discharge
Two probe required times are passed through in face, therefore the resolution ratio of pulse signal is higher.
4. safe and reliable.The supply voltage of circuit is 24V DC voltages, is less than safe voltage 36V, therefore personal safety obtains
To guarantee.
Description of the drawings
Fig. 1 is ion probe structure, installation and data acquisition schematic diagram.
Fig. 2 is 3 road design drawing of signal processing circuit.
Fig. 3 is ion probe velocity-measuring system total figure.
1 it is copper wire probe in figure, 2 be alundum tube, 3 be stainless steel sleeve pipe, 4 be detonation tube wall, 5 be fixed pedestal, 6 is
Insulation filling glue, 7 are probe output ends.
Specific implementation mode
The present invention is described in detail with reference to the accompanying drawings and detailed description：
As shown in Figure 1, a kind of ion probe velocity-measuring system measuring Gaseous Detonation speed of the present invention is by ion probe, signal
Processing circuit, data acquisition recorder are constituted.Ion probe includes the copper wire probe 1 of 1 couple of a diameter of 1mm, outer diameter 4mm doubled vias
Alundum tube 2, the internal diameter of a diameter of 1mm is the stainless steel sleeve pipe 3 that 4.2mm thickness is 1mm.Copper wire probe 1 is inserted into after being stained with glue
3mm is stretched out on the doubled via of alundum tube 2, head, and probe gap is 1mm.Stainless steel sleeve is inserted into 2 outer surface of alundum tube after being stained with glue
Pipe 3, the two length are determined by the wall thickness of detonation tube wall 4.In order to ensure the electric conductivity of end of probe, with blade by the glue on head
Water is scraped totally.Fixed pedestal 5 is fixed on by the way of welding or glue on detonation tube wall 4, fixed pedestal 5 and stainless steel sleeve
Interstitial site between pipe 3 also uses edge filling glue 6 to seal.Contain plastic insulation in two conducting wire outer surfaces of probe output end 7
Rubber, the output of each ion probe are respectively connected to some input port of signal processing circuit, the output of signal processing circuit
Access data acquisition recorder.
As shown in Fig. 2, signal processing circuit provides excitation by 24V DC voltages.Since picture size limits, only given in figure
Going out 3 road ion probe signal processing circuit design diagrams, 3 road branch circuit parallel connections, the design of each branch is completely the same, including
Protective resistance, diode, probe and the 0.001uF capacitance in parallel with diode and probe of 1000k Ω.Remaining is unillustrated
Branch also uses identical design, with the 3 road branch circuit parallel connections drawn.The output end of signal processing circuit is the both ends resistance R0
Voltage.The wherein one end resistance R0 is grounded, and the other end accesses signal acquisition recorder.The resistance value of resistance R0 can be adopted according to signal
The range of collection recorder freely designs, and the present invention is designed as 20k Ω.It, should be from when detonation wave front passes through some ion probe
The circuit branch conducting that sub- probe is connected, the capacitance of branch road discharge rapidly, to generate pulse voltage at the both ends resistance R0,
The signal is recorded by data acquisition recorder.
As shown in figure 3, the present invention is total to 24 ion probes of design and installation, equidistantly pacify in the flame acceleration section of 1.2m long
6 are filled, 18 are arranged in the detonation section of 8.8m long.24 ion probes respectively with it is defeated in 24 branches of signal processing circuit
Enter end to be connected, the output of signal processing circuit accesses signal acquisition recorder.Flame often passes through an ion probe, signal acquisition
Recorder generates a voltage pulse signal, the time difference occurred according to the spacing of adjacent ions probe and successive pulse signals
The mean propagation velocity of the flame between two neighboring ion probe can be calculated.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
The specific implementation mode of the present invention is only limitted to this, for the ordinary technical staff in the technical field of the invention, as long as
Within the spirit of the present invention, variation and modification to embodiment described above all should be considered as the power in the present invention
Within the scope of sharp claim.
Claims (4)
1. a kind of ion probe velocity-measuring system measuring Gaseous Detonation speed, it is characterised in that：It is visited including ion probe, with ion
The signal processing circuit of needle connection and the data acquisition recorder being connect with signal processing circuit；
The ion probe part is located in Detonation Tube, including is provided with the alundum tube (2) of doubled via, a pair of of copper wire probe (1)
It is inserted into the doubled via of alundum tube (2), both ends head is stretched out, and alundum tube (2) external concentric is provided with stainless steel sleeve pipe (3)；Copper wire
Gap between gap and alundum tube (2) and stainless steel sleeve pipe (3) between probe (1) and alundum tube (2) doubled via is using industry
Insulating cement is filled；The length of the alundum tube (2) and stainless steel sleeve pipe (3) is according to the wall thickness changes of detonation tube wall (4)；It is described
The probe output end (7) of ion probe is connected with signal processing circuit；
The signal processing circuit provides excitation using 24V DC voltages, is formed by No. 24 probe branch circuit parallel connections, each probe branch
Road all same, including protective resistance, diode, ion probe and the 0.001uF capacitance in parallel with diode and ion probe,
The output end of signal processing circuit is the voltage at the both ends resistance R0, and wherein the one end resistance R0 is grounded, and the other end accesses data acquisition
Recorder；When detonation wave front passes through some ion probe, the branch conducting which is connected, the capacitance of branch road
Rapid electric discharge, to generate pulse voltage at the both ends resistance R0, which is recorded by data acquisition recorder；Due to using in parallel
The single channel of circuit design, signal processing circuit output end and data logger connects；
No. 24 probe branch road ion probe is arranged in flame acceleration section and detonation section；24 ion probes respectively with signal
Input terminal in 24 branches of processing circuit is connected, and when flame often passes through an ion probe, data acquisition recorder produces
A raw voltage pulse signal, the time difference occurred according to the spacing of adjacent ions probe and successive pulse signals can calculate
Go out the mean propagation velocity of the flame between two neighboring ion probe.
2. a kind of ion probe velocity-measuring system measuring Gaseous Detonation speed according to claim 1, it is characterised in that：Institute
It states No. 24 probe branch road ion probes and is equally spaced 6 in the flame acceleration section of 1.2m long, in the detonation section cloth of 8.8m long
Set 18.
3. a kind of ion probe velocity-measuring system measuring Gaseous Detonation speed according to claim 1, it is characterised in that：Institute
It is 4mm, a diameter of 1mm of interior doubled via to state alundum tube (2) outer diameter；A diameter of 1mm of the copper wire probe (1), two ends
5mm is stretched out in portion；The internal diameter of the stainless steel sleeve pipe (3) is 4.2mm, thickness 1mm.
4. a kind of ion probe velocity-measuring system measuring Gaseous Detonation speed according to claim 1, it is characterised in that：Institute
The resistance value for stating protective resistance is 1000k Ω, and the resistance value of resistance R0 is 20k Ω.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810115629.9A CN108333385B (en) | 2018-02-05 | 2018-02-05 | A kind of ion probe velocity-measuring system measuring Gaseous Detonation speed |
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| CN201810115629.9A CN108333385B (en) | 2018-02-05 | 2018-02-05 | A kind of ion probe velocity-measuring system measuring Gaseous Detonation speed |
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| CN108333385A true CN108333385A (en) | 2018-07-27 |
| CN108333385B CN108333385B (en) | 2019-08-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112230013A (en) * | 2020-09-18 | 2021-01-15 | 中国航发哈尔滨东安发动机有限公司 | Method and device for measuring flow velocity of high-temperature conductive fluid |
| CN113514146A (en) * | 2021-04-16 | 2021-10-19 | 中国人民解放军战略支援部队航天工程大学 | Induction plug capable of simultaneously measuring detonation combustion ion signal and combustion light signal |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111175435B (en) * | 2020-01-19 | 2021-12-17 | 上海交通大学 | Device and method for measuring propagation characteristics of detonation waves |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112230013A (en) * | 2020-09-18 | 2021-01-15 | 中国航发哈尔滨东安发动机有限公司 | Method and device for measuring flow velocity of high-temperature conductive fluid |
| CN113514146A (en) * | 2021-04-16 | 2021-10-19 | 中国人民解放军战略支援部队航天工程大学 | Induction plug capable of simultaneously measuring detonation combustion ion signal and combustion light signal |
| CN113514146B (en) * | 2021-04-16 | 2023-09-26 | 中国人民解放军战略支援部队航天工程大学 | Inductive plug capable of measuring detonation combustion ion signal and combustion light signal simultaneously |
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| CN108333385B (en) | 2019-08-30 |
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