CN107991101A - A kind of propellant combustion smokescope test device - Google Patents
A kind of propellant combustion smokescope test device Download PDFInfo
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- CN107991101A CN107991101A CN201711248620.7A CN201711248620A CN107991101A CN 107991101 A CN107991101 A CN 107991101A CN 201711248620 A CN201711248620 A CN 201711248620A CN 107991101 A CN107991101 A CN 107991101A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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Abstract
The invention discloses a kind of propellant combustion smokescope test device, is mainly made of closed combustion chamber, pressure adjusting module, test chamber, light source, light-intensity test sensor, priming supply, high-pressure air source and digital sampling and processing.Pressure adjusting module adjusts the indoor pressure of closed burning and controls the break-make of closed combustion chamber and test chamber.There is symmetrical detecting window on test chamber, light intensity of the light source with light-intensity test sensor when smog is passed through in the detecting window both sides of test chamber, test chamber changes.Compared with traditional smokescope test device, the separation of the device combustion chamber and test chamber, on the one hand so that closed chamber structure is simple, reduces the difficulty of device design processing；On the other hand, to the dynamic test mode of smog so that the compressive resistance requirement of test chamber is low, while maintenance easy to clean.The present invention can be used for the propellant of small pit goaf and the combustion fumes concentration determination of propellant powder.
Description
Technical field
The present invention relates to a kind of propellant combustion smokescope test device, and in particular to propellant small pit goaf test sample
Combustion fumes concentration determination device.
Background technology
Solid propellant and its covering material work in rocket engine caused by a large amount of smog, guided missile can be directly affected
Guidance and Stealth Fighter.Solid propellant smoke concentration be low characteristic signal propellant development and production process in must be tight
The important indicator of lattice control, it is propellant formulation research and weapon type to establish the measurement of propellant smokescope and evaluation method
An important content in number index request.
In the engine plume smog testing field of propellant, have in National Military Standard GJB 770B-2005
801.1 " solid propellant exhaust plume infrared transmittivity test smog passage methods ", patent 201610164586.4 also discloses that
A kind of muzzle smoke concentration determination device and method, it is collected the thorax mouth smog of propellant powder using muzzle smoke box, and profit
Smokescope is tested with photoelectric sensor.Both of which is to propellant powder/propulsion using smog collecting box/smoke path
The smog that agent powder charge burning produces carries out a degree of collection.In these methods, first to test sample-propellant/hair
Penetrating the charge structure of medicine has strict demand, and needs sample size larger.On the other hand, smog collecting box/smoke path all only
Smog, the high temperature and pressure flow field of weapons with pipes/engine at work can be collected to a certain extent so that smog collecting box has
Standby relief valve, smoke path distance test engine certain distance, the part smog that propellant/gun propellant combustion produces not by
Collect, detect.In patent 201610164586.4, smog is a kind of relatively quiet for closed combustion chamber (or smog collecting box)
Only state, and in " solid propellant exhaust plume infrared transmittivity test smog passage method ", smog is for smoke path
A kind of state of relative motion.But both approaches require relatively stringent, test sample dose more to the charge structure of test sample
Greatly, test result is not suitable for promoting by clad, engine/weapons with pipes/test environment etc. environmental impact factor bigger
Agent and the formulating stage of propellant powder.
For the propellant test sample of small pit goaf, industry uses the more ripe solid based on closed combustion chamber more at present
Propellant smog optical transmittance longitudinal direction multi-pass multiband measuring device (patent 201410422746.1) carries out dependence test.
The device possesses the advantages that required test sample amount is few, and test method is simple, test result stability and good accuracy, but structure
Design causes it to come with some shortcomings in processing and maintenance.3 pairs of optical glass are installed on existing closed combustion chamber.It is this
On the one hand structure causes the difficulty of processing of closed combustion chamber larger, right particularly when increasing closed combustion chamber compressive resistance
The perforate design of combustion chamber and the mechanical performance of optical glass propose harsh requirement, and optical glass is the weak ring of its safety
Section.During closed combustion chamber operational, inside needs to fill high pressure nitrogen, once optical glass fragmentation, in itself and can test device
The property and life security in laboratory cause huge loss.On the other hand, the optical glass cleaning in closed combustion chamber
Difficulty it is larger.After test device uses several times, agent burning can be pushed on the inside of the optical glass on closed combustion chamber
Smog residual contamination, can cause the response performance of device entirety to be deteriorated, it is necessary to clean on the inside of optical glass.It is clear to dismantle optical glass
It is clean, it is not only bothersome laborious, but also easily the overall air-tightness of closed combustion chamber is impacted.
The content of the invention
In order to overcome the shortcomings of the prior art and defect, the present invention provides a kind of propellant combustion smokescope test
Device.
Propellant combustion smokescope test device provided by the invention, by closed combustion chamber, pressure adjusting module, test
Chamber, light source, light-intensity test sensor, priming supply, high-pressure air source and digital sampling and processing composition.
The function of closed combustion chamber is that the burning situation for possessing certain initial pressure is provided for test sample；Module pressure tune
High-pressure air source provides initial pressure to section module for closed combustion chamber in order to control, and controls the break-make of closed combustion chamber and test chamber；
Light source and light-intensity test sensor are located at the detecting window both sides of test chamber respectively；Priming supply is the closed indoor test specimens of burning
Product provide initial firing current；Data acquisition module is responsible for gathering the pressure sensor signal of pressure regulating unit and light-intensity test passes
The output signal of sensor and the data processing in later stage.
The closed combustion chamber is made of housing, plug, blanking cover.Housing is cylindrical drum, and both ends are by screw thread respectively with stifled
Head, blanking cover connection blend rubber circle sealing.Pressure tap, air admission hole, exhausting-gas hole on plug.There are 2 binding posts to pass through on blanking cover
Power cord is connected to priming supply, and the priming supply is DC current source.
The pressure adjusting module is made of intake valve, air bleeding valve, pressure sensor；Intake valve one end connects high pressure gas
Source, the other end are connected on the air admission hole of plug；Pressure sensor is installed to the pressure tap of plug, the connection of its signal output part
To digital sampling and processing；The exhausting-gas hole of air bleeding valve one end connection plug is connected, and the other end is connected to test chamber.Filled to improve
The precision and the degree of automation of journey are pressed through, the pneumatic operated valve with PID regulatory functions can be selected in intake valve.Device is in discharge flue gas process
In, corrosive gas is usually contained in flue gas, therefore air bleeding valve usually selects the preferable solenoid valve of corrosion resistance.
During in order to reduce test, the vortex and smog that occur when flue gas passes through pipeline in pipeline corner glue wall and sink
Phenomenon drops, and all pipelines being directly connected to air bleeding valve are straight tube.
Test chamber is cylindrical shape, in general, the volume in test chamber is much smaller than the intracavitary volume of combustion chamber.Test chamber both ends one
End is connected to air bleeding valve, and other end connecting line will test exhaust gas discharge.Test chamber stack shell symmetrically opens detection window, detection window
Upper installation optical glass, in perforate both sides, installs light source and light-intensity test sensor respectively.The optical signalling that light source is sent is from survey
The detecting window one end tried on chamber enters, through after test chamber, the light-intensity test sensor by tested chamber opposite side detection window
Sensing receives.Distinguished from the wave band of detection light, light-intensity test module includes a variety of different-wavebands such as infrared, visible, laser
Light source and light-intensity test sensor assembly.
The digital sampling and processing is made of industrial personal computer and data collector, and pressure sensor, light-intensity test pass
The signal output part of sensor is connected to data collector by data cable.Industrial personal computer control data collector carries out data acquisition,
And carry out the data processing in later stage.
The application method of the device：
The first step：By load weighted test sample by ignition wire be fixed on closed combustion chamber plug two binding posts it
Between, then plug is installed on the housing of combustion chamber.
Second step：The air bleeding valve of pressure regulating unit is closed, opens intake valve, chamber pressure is adjusted to designated value.
3rd step：Test sample is lighted by priming supply.
4th step：When initial pressure is relatively low, the intake valve of pressure regulating unit is opened, chamber pressure is risen to specific
Value.(step is optional)；
5th step：Control data collector to gather light-intensity test sensor by industrial personal computer to export signal, open pressure tune
The vent valve of unit is saved, until chamber pressure is atmospheric pressure.
6th step：Stop data acquisition, the smog transmitance of test sample is drawn with time graph, meter using collection result
Calculate the Average smoke transmitance of test sample.
The advantage of the invention is that：
1st, the design difficulty of processing of closed combustion chamber is relatively low in the device.The device divides test chamber and closed combustion chamber
From, on the one hand, so that optical glass window is not required in closed chamber structure, greatly reduce the difficult processing of closed combustion chamber
Degree.On the other hand, test chamber one end is designed for opening, reduces the resistance to pressure to optical glass on test chamber and above
Degree, so as to reduce the difficulty of processing of test chamber.When the closed combustion chamber for needing to process high pressure resistant (more than compressive resistance 20MPa)
When, the superiority of the present apparatus becomes apparent from.
2nd, device maintenance easy to clean.Test chamber is cleaned, directly optical glass can be pulled down and be cleaned.Behaviour
Make simply, and be not concerned about dismounting refitting process and device entirety air-tightness is impacted；When being cleaned to closed combustion chamber, it will burn
Room plug unloads, and combustion chamber inner cavity is straight tube structure, easy to clean.
3rd, the security of the device is higher.Closed combustion chamber critical piece in device is metal, and surface is without optics material
Material, under high pressure working environment, its security is secure.
4th, real working condition of the test environment that the device is provided closer to propellant/propellant powder.Propellant/propellant powder dress
After medicine burns in engine/weapons with pipes, as flow field is into motion state.The present apparatus with closed combustion chamber simulated engine/
Initial pressure in weapons with pipes, utilizes closed combustion chamber and the pressure difference of test chamber so that flue gas passes through detection into flow regime
Chamber.Compared with prior art, the smoke condition that the present apparatus is detected burns what is generated closer to test sample under real working condition
Smoke condition.
Brief description of the drawings
Fig. 1 propellant combustion smokescope test device schematic diagrames.Wherein, the closed combustion chamber 2- pressure adjusting modules of 1-,
3- test chambers, 4- light sources, 5- light-intensity test sensors, 6- priming supplies, 7- high-pressure air sources, 8- priming supplies, 9- data acquisitions
Module.
The closed chamber structure figures of Fig. 2, wherein 1-1 are housing, and 1-2 is plug, and 1-3 is blanking cover, and 1-4 is pressure tap, 1-5
For air admission hole, 1-6 is exhausting-gas hole, and 1-7 is binding post.
Embodiment
Explanation is further explained to the present invention below by embodiment.
As shown in Figure 1, propellant combustion smokescope test device is by closed combustion chamber 1, pressure adjusting module 2, test
Chamber 3, light source 4, light-intensity test sensor 5, priming supply 6, high-pressure air source 7 and digital sampling and processing 8 form；
The function of closed combustion chamber 1 is that the burning situation for possessing certain initial pressure is provided for test sample；Module pressure
High-pressure air source 7 provides initial pressure to the function of adjustment module 2 for closed combustion chamber 1 in order to control, and controls closed combustion chamber 1 with surveying
Try the break-make of chamber 3；Light source 4 and light-intensity test sensor 5 are located at the both sides of the glass window of test chamber 3 respectively；Priming supply 6 is
Test sample in closed combustion chamber 1 provides initial firing current；The pressure that data acquisition module 8 is responsible for collection pressure regulating unit passes
Sensor signal and the output signal of light-intensity test sensor and the data processing in later stage；
The case material of closed combustion chamber 1 is 1Cr18Ni9Ti, and intracavitary volume is 1L.Combustion chamber is by housing 1-1, plug 1-
2nd, blanking cover 1-3 is formed；The housing 1-1 that burns is cylindrical drum, its internal diameter is Φ 50mm.Housing both ends plug 1- is used by screw thread respectively
2nd, blanking cover 1-3 connections, the sealing of blend rubber circle；Pressure tap, air admission hole, exhausting-gas hole on plug 1-2；There are 2 to connect on blanking cover 1-3
Terminal is connected to priming supply 6 by power cord, and priming supply is DC current source.
Pressure adjusting module 2 is made of intake valve 2-1, air bleeding valve 2-2, pressure sensor 2-3；Intake valve 2-1 one end connects
High-pressure air source 7 is connect, the other end is connected on the air admission hole of plug 1-2；Pressure sensor 2-3 is installed to the pressure tap of plug 1-2
On, its signal output part is connected to digital sampling and processing 8；The exhausting-gas hole of air bleeding valve 2-2 one end connection plug 1-2 is connected,
The other end is connected to test chamber 3；All pipelines being directly connected to air bleeding valve 2-2 are straight tube.Air bleeding valve selects break-make type electricity
Magnet valve.
Test chamber 3 is cylindrical shape, its barrel diameter is Φ 40mm, and length 200mm, 3 both ends one end of test chamber is connected to
Air bleeding valve, other end connecting line will test exhaust gas discharge.Test chamber stack shell has the detecting window of 3 couples of Φ 20mm, and detecting window is built-in
K9 optical glass.The light source on 3 pairs of detecting window both sides is respectively with light-intensity test sensor：The parallel light tube and sulphur of visible light wave range
Cadmium photo resistance, tungsten halogen lamp parallel light tube and vulcanized lead sensor, 0.808 μm of laser is with adding narrow band filter slice (center
Wavelength be 0.808 μm) vulcanized lead sensor.
Digital sampling and processing 8 is made of industrial personal computer 8-1 and data collector 8-2.The sampling of data collector 8-2 is led to
Road is 8, and highest sampling rate is 1K.Pressure sensor 2-3, the signal output part of light-intensity test sensor 5 are connected by data cable
It is connected to data collector 8-2；Industrial personal computer 8-1 controls data collector 8-2 carries out data acquisition, and carries out at the data in later stage
Reason.
Application method：
The first step：The propellant test sample that quality is 0.1g is fixed on the two of closed combustion chamber plug by ignition wire
Between a binding post, then plug is installed on the housing of combustion chamber.
Second step：The air bleeding valve of pressure regulating unit is closed, opens intake valve, chamber pressure is adjusted to 7MPa.
3rd step：The electric current of priming supply is arranged to 5A, and switching on the ignition circuit, test sample is lighted.
5th step：Control data collector to start to gather light-intensity test sensor output signal by industrial personal computer, open pressure
The vent valve of power adjustment unit, until chamber pressure is atmospheric pressure.
6th step：By industrial personal computer stop data acquisition, using collection result draw test sample smog transmitance with
Time graph, calculates Average smoke transmitance of the test sample in visible, near-infrared and 0.808 μm of laser wavelength.
Present invention is not limited to the embodiments described above, using identical with the above embodiment of the present invention or approximate structure, and
Obtained other structures design, within protection scope of the present invention.
Claims (5)
1. a kind of propellant combustion smokescope test device, it is characterised in that by closed combustion chamber (1), pressure adjusting module
(2), test chamber (3), light source (4), light-intensity test sensor (5), priming supply (6), high-pressure air source (7) and data acquisition process
Module (8) forms；
The closed combustion chamber (1) provides burning situation for test sample, by housing (1-1), plug (1-2), blanking cover (1-3) group
Into；Housing (1-1) is cylindrical drum, and both ends are sealed with plug (1-2), blanking cover (1-3), had on plug (1-2) respectively by screw thread
Pressure tap, air admission hole, exhausting-gas hole, have 2 binding posts to be connected to priming supply (7) by power cord on blanking cover (1-3)；
Module pressure adjustment module (2) the control high-pressure air source (7) provides initial pressure for closed combustion chamber (1), and controls
Closed combustion chamber (1) and the break-make of test chamber (3)；Pressure adjusting module (2) is by intake valve (2-1), air bleeding valve (2-2), pressure
Sensor (2-3) forms；Intake valve (2-1) one end connection high-pressure air source (7), the air admission hole of other end connection plug (1-2)；Pressure
Force snesor (2-3) is installed on the pressure tap of plug (1-2), its signal output part is connected to digital sampling and processing (8)；
The exhausting-gas hole of air bleeding valve (2-2) one end connection plug (1-2), the other end are connected with cylindric test chamber (3), and test chamber (3) is another
One end connecting line discharges flue gas；Test chamber (3) stack shell has symmetrical detection window, and optics glass is installed on detection window
Glass；Light source (4) and light-intensity test sensor (5) are located at detection window both sides；
The data acquisition module (8) is made of industrial personal computer (8-1) and data collector (8-2), is responsible for collection pressure sensor
The data processing for going out signal and later stage of (2-3) signal and light-intensity test sensor (5)；Pressure sensor (2-3), light intensity
The signal output part of detection sensor (5) is connected to data collector (8-2) by data cable；Industrial personal computer (8-1) controls data
Collector (8-2) carries out data acquisition, and carries out the data processing in later stage.
2. propellant combustion smokescope test device according to claim 1, it is characterised in that test chamber (3) stack shell pair
Perforate is claimed to have multipair, multiple light sources (4) and light-intensity test sensor (5) are placed in both sides respectively.
3. propellant combustion smokescope test device according to claim 1, it is characterised in that light-intensity test sensor
(5) the light-intensity test sensor of the different response wave bands such as infrared, visible, laser may be selected.
4. propellant combustion smokescope test device according to claim 1, it is characterised in that in pressure adjusting module
Intake valve (2-1) be the pneumatic operated valve with PID regulatory functions, air bleeding valve (2-2) is corrosion resistant solenoid valve.
5. propellant combustion smokescope test device according to claim 1, it is characterised in that all and air bleeding valve (2-
2) pipeline being directly connected to is straight tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711248620.7A CN107991101A (en) | 2017-12-01 | 2017-12-01 | A kind of propellant combustion smokescope test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711248620.7A CN107991101A (en) | 2017-12-01 | 2017-12-01 | A kind of propellant combustion smokescope test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107991101A true CN107991101A (en) | 2018-05-04 |
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ID=62035150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711248620.7A Pending CN107991101A (en) | 2017-12-01 | 2017-12-01 | A kind of propellant combustion smokescope test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044492A (en) * | 2019-11-29 | 2020-04-21 | 泸州北方化学工业有限公司 | Device and method for testing concentration of smoke emitted by small-caliber bullet |
| PL441442A1 (en) * | 2022-06-10 | 2023-12-11 | Politechnika Warszawska | Test stand for measuring smoke during the combustion of solid rocket propellants |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201607402U (en) * | 2010-03-02 | 2010-10-13 | 东南大学 | Ultraviolet absorption spectrum measuring device of coal sulfur content |
| CN102564959A (en) * | 2012-01-09 | 2012-07-11 | 武汉理工大学 | Device for detecting combustion flue gas amount of combustible material |
| CN105911220A (en) * | 2016-04-13 | 2016-08-31 | 西安近代化学研究所 | Gunpowder combustion gas component test apparatus |
| CN107300541A (en) * | 2017-06-21 | 2017-10-27 | 云南中烟工业有限责任公司 | A kind of method of quantitatively characterizing electronic cigarette smog mass concentration |
-
2017
- 2017-12-01 CN CN201711248620.7A patent/CN107991101A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201607402U (en) * | 2010-03-02 | 2010-10-13 | 东南大学 | Ultraviolet absorption spectrum measuring device of coal sulfur content |
| CN102564959A (en) * | 2012-01-09 | 2012-07-11 | 武汉理工大学 | Device for detecting combustion flue gas amount of combustible material |
| CN105911220A (en) * | 2016-04-13 | 2016-08-31 | 西安近代化学研究所 | Gunpowder combustion gas component test apparatus |
| CN107300541A (en) * | 2017-06-21 | 2017-10-27 | 云南中烟工业有限责任公司 | A kind of method of quantitatively characterizing electronic cigarette smog mass concentration |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044492A (en) * | 2019-11-29 | 2020-04-21 | 泸州北方化学工业有限公司 | Device and method for testing concentration of smoke emitted by small-caliber bullet |
| PL441442A1 (en) * | 2022-06-10 | 2023-12-11 | Politechnika Warszawska | Test stand for measuring smoke during the combustion of solid rocket propellants |
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