CN103697935A - Device for testing transient-state pressure release combustion instability characteristic of base bleed propellant - Google Patents

Device for testing transient-state pressure release combustion instability characteristic of base bleed propellant Download PDF

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Publication number
CN103697935A
CN103697935A CN201310491701.5A CN201310491701A CN103697935A CN 103697935 A CN103697935 A CN 103697935A CN 201310491701 A CN201310491701 A CN 201310491701A CN 103697935 A CN103697935 A CN 103697935A
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plug
pressure release
electrode
pressure
igniting
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CN103697935B (en
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余永刚
曹永杰
叶锐
周彦煌
刘东尧
陆欣
刘殿金
张领科
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Abstract

The invention discloses a device for testing the transient-state pressure release combustion instability characteristic of a base bleed propellant. According to the device, a transparent observation window, an ignition combustion chamber, a temperature measuring component, a pressure release component and a pressure sensor are mounted on a main combustion chamber; the ignition combustion chamber is used for igniting an explosive bar to be tested; a micro thermoelectric couple is hermetically mounted on the temperature measuring component; when the pressure inside the main combustion chamber reaches the pressure resistance limit of the pressure release component, transient pressure release is achieved; when the pressure sensor is used for measuring the pressure change inside the main combustion chamber in the combustion process, a high-speed camera is used for shooting the combustion situation of the explosive bar to be tested through an optical path converter and the transparent observation window, and a thermocouple temperature measuring device is used for testing the solid-phase temperature distribution of the explosive bar to be tested; a data acquirer is used for acquiring and recording the output data of the pressure sensor, and the output data together with the images shot by the high-speed camera and the temperature measurement data measured by the thermocouple temperature measuring device are transmitted into a computer to be analyzed and processed. By adopting the device, the combustion velocity, the combustion state and the solid phase temperature distribution of the base bleed propellant under different initial pressure of release pressure and pressure drop velocities can be measured.

Description

End row's propellant transient state pressure release burning unstability characteristic test device
Technical field
The invention belongs to solid propellant technical field, particularly a kind of end row's propellant transient state pressure release burning unstability characteristic test device.
Background technology
AP/HTPB composite propellant is widely used in the base bleed range-extending technique of solid propellant rocket and large caliber gun.In order accurately to control the trajectory of rocket, improve its operation flexibility, conventionally need to realize thrust termination by thrust reverser, adopting reduction of blood pressure in high-speed to make propellant flame-out is one of the most attractive method; And end row plays AP/HTPB propellant used and goes out gun muzzle moment at bullet, will the experience transient state pressure leak process more more severe than rocket engine operating mode, may cause burning unstability, affect bullet fire accuracy.
As far back as the sixties in 20th century, with regard to starting the combustion characteristics under pressure-lowering condition to solid propellant, experiment and theoretical research have been carried out abroad.Experiment shows, has a flame-out minimum rate of pressure reduction of solid propellant (comprising compound and double-basis type) that makes smooth combustion; Researchers have proposed the flame-out mechanism of several solid propellant reduction of blood pressure in high-speed, and fundamental purpose is that prediction makes the propellant required critical rate of pressure reduction that stops working.There is not yet external report and take the AP/HTPB composite propellant transient state pressure release combustion characteristics research that end row bullet carries out as background, transient state pressure release condition when state inland spring justice waits people to use semi-closed bomb vessel simulation end row ejection gun muzzle, studied the transition combustion characteristics of AP/HTPB composite base row propellant under high rate of pressure reduction, think when the end of at, row ejects gun muzzle, the end row propellant unstability of may burning, basic critical conditions (the Lu Chunyi etc.: energetic material in flame-out/resume combustion, 16 (6): 587-591,2007).The semi-closed bomb vessel that they adopt does not have view window, cannot directly observe the combustion process of end row's propellant, does not measure propellant temperature yet and distributes, and the parameter that can test is very limited.The people such as Zhao Hongli have designed a kind of semi-closed bomb vessel containing single view window, have studied a kind of transient combustion characteristic (Zhao Hongli etc.: fiery explosive journal, 35 (1): 64-68,2012) of double-base propellant.They adopt the ignite sparking mode of sample powder column of black powder, for double base propellant, adopt and easily realize in this way igniting, but practice shows, for composite propellant, this sparking mode is insecure.In addition, they also fail to test the temperature variation in propellant combustion process.
Summary of the invention
The object of the present invention is to provide a kind of pressure that not only can test in pressure leak process to change, directly observe the combustion case of medicinal strip, also can measure exactly end row's propellant transient state pressure release burning unstability characteristic test device of the solid-state temperature distribution of medicinal strip.
The technical solution that realizes the object of the invention is:
A kind of end row's propellant transient state pressure release burning unstability characteristic test device, comprise main chamber, igniter chamber, pressure transducer, the pulse power, data acquisition unit and computing machine, also comprise temperature measurement component, pressure release assembly, optical path converter, high-speed camera instrument, thermocouple temperature measurement instrument; Main chamber one end is connected with temperature measurement component by screw thread, and the other end is connected with pressure release assembly by screw thread; Igniter chamber and pressure transducer are installed on main chamber side, on main chamber, perpendicular to the side of pressure tap, coaxially offer two windows, transparent windows is installed in sealing; In transparent windows the place ahead, optical path converter is set, high-speed camera instrument is arranged on optical path converter one side, data acquisition unit Bonding pressure sensor, and thermocouple temperature measurement instrument connects temperature measurement component, and the pulse power connects igniter chamber; High-speed camera instrument, data acquisition unit and thermocouple temperature measurement instrument are connected computing machine.
The present invention compared with prior art, its remarkable advantage:
(1) structure of the present invention can realize the reliable ignition to medicinal strip to be measured.
(2) structure of the present invention, owing to having adopted the design of view window, can utilize high-speed camera instrument clearly to photograph the combustion case of medicinal strip to be measured in transient state pressure leak process, is convenient to observe.
(3) design of adopts pressure sensor of the present invention and low-grade fever galvanic couple, the pressure that not only can test in pressure leak process changes, and the solid-state temperature that also can measure exactly medicinal strip distributes.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is general structure schematic diagram of the present invention.
Fig. 2 is that the structure of main chamber of the present invention forms and annexation schematic diagram.
Fig. 3 is that the structure of main chamber of the present invention and each parts that are connected thereof forms and annexation schematic diagram.
Fig. 4 is the present invention's medicinal strip fastening structure to be measured schematic diagram.
Fig. 5 is the typical transient combustion pressure process-time changing curve of the present invention.
Fig. 6 is the typical medicinal strip solid-state temperature-time changing curve to be measured of the present invention.
Embodiment
Row's propellant transient state pressure release burning of a kind of end of the present invention unstability characteristic test device, comprise main chamber 1, igniter chamber 2, pressure transducer 5, the pulse power 6, data acquisition unit 11 and computing machine 12, also comprise temperature measurement component 3, pressure release assembly 4, optical path converter 7, high-speed camera instrument 8, thermocouple temperature measurement instrument 10; Main chamber 1 one end is connected with temperature measurement component 3 by screw thread, and the other end is connected with pressure release assembly 4 by screw thread; Igniter chamber 2 and pressure transducer 5 are installed on main chamber 1 side, on main chamber 1, perpendicular to the side of pressure tap, coaxially offer two windows, transparent windows 1-3 is installed in sealing; In transparent windows 1-3 the place ahead, optical path converter 7 is set, high-speed camera instrument 8 is arranged on optical path converter 7 one sides, data acquisition unit 11 Bonding pressure sensors 5, and thermocouple temperature measurement instrument 10 connects temperature measurement component 3, and the pulse power 6 connects igniter chamber 2; High-speed camera instrument 8, data acquisition unit 11 and thermocouple temperature measurement instrument 10 are connected computing machine 12.
Igniter chamber 2 comprises igniter chamber body 2-1, igniting plug packing washer 2-2, igniting plug 2-3, the first electrode 2-4, the second electrode 2-5, third electrode 2-9, the 4th electrode 2-10, insulating sleeve 2-6, insulation spacer 2-7, spiral shell 2-8, igniter pad 2-11 and pressure limiting diaphragm 2-12 are pressed in igniting, on igniting plug 2-3, be embedded with igniting plug packing washer 2-2, be threaded connection on igniter chamber body 2-1, the first electrode 2-4 is arranged in igniting plug 2-3, away from one end of igniting combustion chamber body 2-1, stretch out igniting plug 2-3, insulation spacer 2-7 is arranged on the first electrode 2-4 near one end of igniter chamber body 2-1, insulating sleeve 2-6 and insulation spacer 2-7 wrap the first electrode 2-4, igniting presses spiral shell 2-8 to stretch into igniting plug 2-3, push down insulation spacer 2-7, third electrode 2-9 presses spiral shell 2-8 to be fixedly connected with the first electrode 2-4 with insulation spacer 2-7 through igniting, the second electrode 2-5 is fixedly connected on the one end that is positioned at third electrode 2-9 on igniting plug 2-3, and the 4th electrode 2-10 is fixedly connected on the one end that is positioned at the first electrode 2-4 on igniting plug 2-3, the first electrode 2-4 is connected the pulse power with the second electrode 2-5, and third electrode 2-9 is connected the nichrome wire through igniter pad 2-11 with the 4th electrode 2-10, pressure limiting diaphragm 2-12 is arranged between igniter chamber body 2-1 and main chamber 1.
Temperature measurement component 3 comprises thermometric plug 3-1, gasket seal 3-2, metal sleeve 3-3, encapsulation pad 3-4, thermometric pressure spiral shell 3-5, medicinal strip clamping plate 3-6, low-grade fever galvanic couple 3-7, medicinal strip 3-8 to be measured, trip bolt 3-9 and dog screw 3-10, gasket seal 3-2 is enclosed within on thermometric plug 3-1, thermometric plug 3-1 is threaded connection on main chamber 1, medicinal strip clamping plate 3-6 is fixed on thermometric plug 3-1, on medicinal strip clamping plate 3-6, be fixed with medicinal strip 3-8 to be measured, metal sleeve 3-3 is arranged in thermometric plug 3-1, its inner chamber is filled up by epoxy glue, encapsulation pad 3-4 covers metal sleeve 3-3, thermometric presses spiral shell 3-5 to push down encapsulation pad 3-4 and by being threaded into thermometric plug 3-1, thermometric presses the inner chamber of spiral shell 3-5 to fill up high-temp glue, the probe of low-grade fever galvanic couple 3-7 inserts in medicinal strip 3-8 to be measured, the other end is pressed spiral shell 3-5 through thermometric successively, encapsulation pad 3-4, metal sleeve 3-3 and thermometric plug 3-1, by high temperature wire, be connected to thermocouple temperature measurement instrument 10.
Pressure release assembly 4 comprises little pressure release plug 4-1, large pressure release plug 4-2, shears diaphragm 4-3 and gasket seal 4-4; Gasket seal 4-4 is enclosed within on large pressure release plug 4-2, large pressure release plug 4-2 is threaded connection on main chamber 1, shearing diaphragm 4-3 puts on the threaded hole shoulder of large pressure release plug 4-2, little pressure release plug 4-1 screws in the threaded hole of large pressure release plug 4-2, compresses the shearing diaphragm 4-3 between little pressure release plug 4-1 and large pressure release plug 4-2.
Main chamber 1 comprises main chamber body 1-1, pad 1-2, transparent windows 1-3, blind flange 1-4 and fastening bolt 1-5; On main chamber body 1-1, there is view window base, transparent windows 1-3 is fixed on view window base by blind flange 1-4 and fastening bolt 1-5, between view window base and transparent windows 1-3 and between transparent windows 1-3 and blind flange 1-4, pad 1-2 is set.
Between pressure transducer 5 and data acquisition unit 11, charge amplifier 9 is set.
Embodiment:
A kind of end row's propellant transient state pressure release burning unstability characteristic test device, comprise main chamber 1, igniter chamber 2, pressure transducer 5, the pulse power 6, data acquisition unit 11 and computing machine 12, also comprise temperature measurement component 3, pressure release assembly 4, optical path converter 7, high-speed camera instrument 8, thermocouple temperature measurement instrument 10; Main chamber 1 one end is connected with temperature measurement component 3 by screw thread, for testing the solid-state temperature of medicinal strip to be measured, distributes, and main chamber 1 other end is connected with pressure release assembly 4 by screw thread, when the pressure in main chamber 1 exceeds certain limitation, plays pressure release effect; Igniter chamber 2 and pressure transducer 5 are installed on main chamber 1 side, on main chamber 1, perpendicular to the side of pressure tap, coaxially offer two windows, transparent windows 1-3 is installed in sealing; In transparent windows 1-3 the place ahead, optical path converter 7 is set, high-speed camera instrument 8 is arranged on optical path converter 7 one sides, and high-speed camera instrument 8 is taken the combustion case of medicinal strip 3-8 to be measured under transient state pressure release and stable state combustion condition by optical path converter 7 and transparent windows 1-3; Data acquisition unit 11 is by charge amplifier 9 Bonding pressure sensors 5, and pressure transducer 5 can be measured 1 pressure variation in main chamber in whole combustion process; Thermocouple temperature measurement instrument 10 connects temperature measurement component 3; The pulse power 6 connects igniter chamber 2, for lighting medicinal strip 3-8 to be measured; High-speed camera instrument 8, data acquisition unit 11 and thermocouple temperature measurement instrument 10 are connected computing machine 12, data acquisition unit 11 gathers and records the output data of pressure transducer 5, together with high-speed camera photo and low-grade fever galvanic couple temperature measurement data, imports into and in computing machine 12, carries out analyzing and processing.
Igniter chamber 2 comprises igniter chamber body 2-1, igniting plug packing washer 2-2, igniting plug 2-3, the first electrode 2-4, the second electrode 2-5, third electrode 2-9, the 4th electrode 2-10, insulating sleeve 2-6, insulation spacer 2-7, spiral shell 2-8, igniter pad 2-11 and pressure limiting diaphragm 2-12 are pressed in igniting, on igniting plug 2-3, be embedded with igniting plug packing washer 2-2, be threaded connection on igniter chamber body 2-1, the first electrode 2-4 is arranged in igniting plug 2-3, away from one end of igniting combustion chamber body 2-1, stretch out igniting plug 2-3, insulation spacer 2-7 is arranged on the first electrode 2-4 near one end of igniter chamber body 2-1, insulating sleeve 2-6 and insulation spacer 2-7 wrap the first electrode 2-4, igniting presses spiral shell 2-8 by being threaded into igniting plug 2-3, push down insulation spacer 2-7, third electrode 2-9 presses spiral shell 2-8 and insulation spacer 2-7 to be threaded with the first electrode 2-4 through igniting, guarantee the first electrode 2-4 and third electrode 2-9 and igniting plug 2-3 insulation, the second electrode 2-5 is threaded connection the one end that is positioned at third electrode 2-9 on igniting plug 2-3, and with igniting plug 2-3 conducting, the 4th electrode 2-10 is threaded connection the one end that is positioned at the first electrode 2-4 on igniting plug 2-3, with igniting plug 2-3 conducting, the first electrode 2-4 is connected the pulse power with the second electrode 2-5, and third electrode 2-9 is connected the nichrome wire through igniter pad 2-11 with the 4th electrode 2-10, pressure limiting diaphragm 2-12 is arranged between igniter chamber body 2-1 and main chamber 1, when the pulse power 6 starts, light igniter pad 2-11 and additional propellant powder, when indoor 2 pressure of ignition reach certain value, break through pressure limiting diaphragm 2-12, produce lasting high-temperature fuel gas jet, be ejected into medicinal strip 3-8 to be measured surface and realize reliable ignition.
Temperature measurement component 3 comprises thermometric plug 3-1, gasket seal 3-2, metal sleeve 3-3, encapsulation pad 3-4, thermometric pressure spiral shell 3-5, medicinal strip clamping plate 3-6, low-grade fever galvanic couple 3-7, medicinal strip 3-8 to be measured, trip bolt 3-9 and dog screw 3-10, gasket seal 3-2 is enclosed within on thermometric plug 3-1, thermometric plug 3-1 is threaded connection on main chamber 1, medicinal strip clamping plate 3-6 is fixed on thermometric plug 3-1 by dog screw 3-10, medicinal strip clamping plate 3-6 is divided into two clamping plates, medicinal strip 3-8 to be measured is close to the clamping plate that a side is longer, trip bolt 3-9 screws in the screw on the shorter clamping plate of opposite side, clamps medicinal strip 3-8 to be measured, metal sleeve 3-3 is arranged in thermometric plug 3-1, its inner chamber is filled up by epoxy glue, encapsulation pad 3-4 covers metal sleeve 3-3, thermometric presses spiral shell 3-5 to push down encapsulation pad 3-4 and by being threaded into thermometric plug 3-1, thermometric presses the inner chamber of spiral shell 3-5 to fill up high-temp glue, the probe of low-grade fever galvanic couple 3-7 inserts in medicinal strip 3-8 to be measured, the other end is pressed spiral shell 3-5 through thermometric successively, encapsulation pad 3-4, metal sleeve 3-3 and thermometric plug 3-1, by high temperature wire, be connected to thermocouple temperature measurement instrument 10, concrete set-up mode is as follows: low-grade fever galvanic couple 3-7 is successively through thermometric plug 3-1, metal sleeve 3-3, encapsulation pad 3-4 and thermometric are pressed spiral shell 3-5, with epoxy glue, fill up metal sleeve 3-3 inner chamber, realize and solidify sealing, and cover metal sleeve 3-3 with encapsulation pad 3-4, press spiral shell 3-5 by being threaded into thermometric plug 3-1 thermometric, by high-temp glue, fill up thermometric and press spiral shell 3-5 inner chamber, the probe of low-grade fever galvanic couple 3-7 is inserted in medicinal strip 3-8 to be measured, by high temperature wire, be connected to thermocouple temperature measurement instrument 10, the solid-state temperature that can obtain medicinal strip 3-8 to be measured distributes.
Pressure release assembly 4 comprises little pressure release plug 4-1, large pressure release plug 4-2, shears diaphragm 4-3 and gasket seal 4-4; Gasket seal 4-4 is enclosed within on large pressure release plug 4-2, large pressure release plug 4-2 is threaded connection on main chamber 1, shearing diaphragm 4-3 puts on the threaded hole shoulder of large pressure release plug 4-2, little pressure release plug 4-1 screws in the threaded hole of large pressure release plug 4-2, compresses the shearing diaphragm 4-3 between little pressure release plug 4-1 and large pressure release plug 4-2; When main chamber 1 internal pressure reaches the withstand voltage limit of shearing diaphragm 4-3, to shear diaphragm 4-3 and punctured by high-pressure gas, the combustion gas in main chamber 1 discharges, and pressure declines rapidly; By regulating the dose of pressing aid cartridge bag in the injection diameter of little pressure release plug 4-1, the material of shearing diaphragm 4-3 and thickness and main chamber 1, can obtain different pressure release original pressure and rate of pressure reduction.
Main chamber 1 comprises main chamber body 1-1, teflon gasket, transparent windows 1-3, blind flange 1-4 and fastening bolt 1-5; On main chamber body 1-1, there is view window base, transparent windows 1-3 is fixed on view window base by blind flange 1-4 and fastening bolt 1-5, between view window base and transparent windows 1-3 and between transparent windows 1-3 and blind flange 1-4, teflon gasket is set; Concrete set-up mode is as follows: first in view window base, place one deck teflon gasket, then put into the transparent windows 1-3 of extraordinary quartz glass material, prevent that transparent windows 1-3 from directly contacting firmly with steel material, and play sealing function; In the groove of blind flange 1-4, also put into one deck teflon gasket, by fastening bolt 1-5, blind flange 1-4 is fixed on main chamber 1; High-speed camera instrument 8 is taken the combustion case of medicinal strip 3-8 to be measured under transient state pressure release and stable state combustion condition by optical path converter 7 and transparent windows 1-3.
Embodiment design parameter:
Main chamber 1 volume is about 430ml; It is the extraordinary quartz glass that 65mm, thickness are 20mm that transparent windows 1-3 adopts diameter; Igniter pad 2-11 is the mixing gunpowder that 2# nitrocotton and 3/1 gunpowder form; Nickel-chrome filament diameter is 0.1mm; The red copper diaphragm that pressure limiting diaphragm 2-12 is thick 0.1mm; Low-grade fever galvanic couple 3-7 adopts the K type thermopair that diameter is 0.1mm; The rectangular parallelepiped AP/HTPB propellant charge that medicinal strip 3-8 to be measured is 10mm * 10mm * 20mm; The injection diameter of little pressure release plug 4-1 has 3 kinds, is respectively 4.0mm, 6.0mm and 8.0mm; Shear red copper diaphragm and xylonite diaphragm that diaphragm 4-3 is thick 0.06mm～0.1mm, can have multiple combination mode; High-speed camera instrument 8 shooting speeds were 1000 frame/seconds.
Before experiment, need carry out the preparation of the preparation of main chamber 1, the preparation of building pressing bag, temperature measurement component 3, the preparation of pressure release assembly 5, the preparation of igniter chamber 2, the preparation of test macro:
The first, the preparation of main chamber 1 is first one deck teflon gasket to be put into the view window base of main chamber body 1-1, then puts into the transparent windows 1-3 of wiped clean; In the groove of blind flange 1-4, put into one deck teflon gasket, finally by fastening bolt 1-5, blind flange 1-4 is fixed on main chamber body 1-1.
The preparation of the second, building pressing bag is according to the size of required pressure release original pressure, weighs 4/7 and 5/7 gunpowder, and makes cartridge bag, is fixed on the longer clamping plate back side of medicinal strip clamping plate 3-6 on temperature measurement component 3.
Three, the preparation of temperature measurement component 3 is in advance low-grade fever galvanic couple 3-7 to be passed to metal sleeve 3-3 and encapsulation pad 3-4, with epoxy glue, fills up metal sleeve 3-3 inner chamber, covers encapsulation pad 3-4, stand-by after solidifying; Medicinal strip 3-8 to be measured is fixed on to thermometric plug 3-1 by medicinal strip clamping plate 3-6 upper, packaged low-grade fever galvanic couple 3-7 is assemblied in to thermometric plug 3-1 upper, with thermometric, press spiral shell 3-5 to compress, low-grade fever galvanic couple 3-7 probe is inserted in medicinal strip 3-8 to be measured; Packing washer is enclosed within to thermometric plug 3-1 upper, thermometric plug 3-1 is threaded connection on main chamber 1, guarantees good seal.
Four, the preparation of pressure release assembly 4 is that packing washer is enclosed within on large pressure release plug 4-2, large pressure release plug 4-2 is tightened on main chamber 1, by shearing diaphragm 4-3, put on the threaded hole shoulder of large pressure release plug 4-2, little pressure release plug 4-1 is screwed in to the threaded hole of large pressure release plug 4-2, compress and shear diaphragm 4-3.
Five, the preparation of igniter chamber 2 is that 2# nitrocotton and 3/1 gunpowder that all weighs 0.50g before each experiment made igniter pad 2-11, and the red copper diaphragm of cutting the thick 0.1mm of a slice is as pressure limiting diaphragm 2-12, to keep the consistance of lighting a fire; Spark electrode is assemblied in to igniting plug 2-3 upper, nichrome wire, through igniter pad 2-11, is connected on spark electrode, use multimeter inspection, guarantee conducting; Additional propellant powder is put into igniter chamber body 2-1, igniting plug packing washer 2-2 is bonded to igniting plug 2-3 upper, be tightened on igniter chamber body 2-1; Pressure limiting diaphragm 2-12 is bonded on the spout of igniter chamber 2, igniter chamber 2 is tightened on main chamber 1, guarantee good seal.
Six, the preparation of test macro is that pressure transducer 5 is arranged on main chamber 1, and ground wire grounded by charge amplifier 9, to reduce signal drift; Adjust optical path converter 7 and high-speed camera instrument 8, guarantee to obtain best shooting effect; After guaranteeing that each testing tool can normally be worked, the pulse power 6 start chargings are stand-by.
During experiment, first start charge amplifier 9, thermocouple temperature measurement instrument 10 and data acquisition unit 11, before the pulse power 6 is about to electric discharge, start high-speed camera instrument 8; After the pulse power 6 electric discharges, igniter pad 2-11 and additional propellant powder are lighted, igniter chamber 2 produces high-temperature fuel gas jet, and the pressing of building in main chamber 1 is coated with instantaneous lighting, and igniting jet is ejected on medicinal strip 3-8 to be measured surface and can be lighted after tens of milliseconds; When main chamber 1 internal pressure reaches the withstand voltage limit of shearing diaphragm 4-3, shearing diaphragm 4-3 is punctured by high-pressure gas, main chamber 1 internal pressure declines rapidly, and sustained combustion, flame-out-resume combustion, the transient combustion behavior such as completely flame-out will appear in medicinal strip 3-8 to be measured under transient state pressure release condition; If select enough thick shearing diaphragm 4-3, can bear the maximum pressure in main chamber 1, medicinal strip 3-8 to be measured will, at nearly quasi-stationary combusting under pressure, according to high-speed camera photo, can obtain its average steady state combustion rate.
For example the interior additional propellant powder quality of igniter chamber 2 is 1.38g; Taking gross weight is 4/7 and 5/7 gunpowder of 3.50g, makes and builds pressing bag; Adopt the little pressure release plug 4-1 that injection diameter is 4.0mm; Shearing diaphragm 4-3 is the red copper diaphragm that 0.06mm is thick.Respectively as shown in Figure 5 and Figure 6, the moment that the igniting jet of all usining in the combustion process sequence photo that high-speed camera instrument 8 is taken starts to spray is as start time for the pressure curve that once experiment records and solid-state temperature curve.According to Fig. 5, can obtain maximum pressure is p m=5.72MPa, maximum reducing speed is dp/dt=-52.7MPa/s; According to Fig. 6 propellant solid-state temperature, distribute to process and obtain burning surface temperature T s=961.9K; Actually can be observed that igniting jet sprays (t=0), builds that pressing bag catches fire (t=3ms), medicinal strip 3-8 to be measured catches fire (t=27ms), medicinal strip 3-8 to be measured smooth combustion (t=47ms), combustion gas starts the phenomenons such as outer spray (t=66ms), medicinal strip 3-8 to be measured flame-out (t=160ms) and resume combustion (t=2350ms), can conclude that this example experiment is flame-out-resume combustion state.

Claims (6)

1. row's propellant transient state pressure release burning unstability characteristic test device at the bottom of a kind, comprise main chamber (1), igniter chamber (2), pressure transducer (5), the pulse power (6), data acquisition unit (11) and computing machine (12), it is characterized in that, also comprise temperature measurement component (3), pressure release assembly (4), optical path converter (7), high-speed camera instrument (8), thermocouple temperature measurement instrument (10); Main chamber (1) one end is connected with temperature measurement component (3) by screw thread, and the other end is connected with pressure release assembly (4) by screw thread; Igniter chamber (2) and pressure transducer (5) are installed on main chamber (1) side, and main chamber (1) is upper coaxially offers two windows perpendicular to the side of pressure tap, and transparent windows (1-3) is installed in sealing; In transparent windows (1-3) the place ahead, optical path converter (7) is set, high-speed camera instrument (8) is arranged on optical path converter (7) one sides, data acquisition unit (11) Bonding pressure sensor (5), thermocouple temperature measurement instrument (10) connects temperature measurement component (3), and the pulse power (6) connects igniter chamber (2); High-speed camera instrument (8), data acquisition unit (11) and thermocouple temperature measurement instrument (10) are connected computing machine (12).
2. propellant transient state pressure release burning unstability characteristic test device is arranged at a kind of end according to claim 1, it is characterized in that: described igniter chamber (2) comprises igniter chamber body (2-1), igniting plug packing washer (2-2), igniting plug (2-3), the first electrode (2-4), the second electrode (2-5), third electrode (2-9), the 4th electrode (2-10), insulating sleeve (2-6), insulation spacer (2-7), spiral shell (2-8), igniter pad (2-11) and pressure limiting diaphragm (2-12) are pressed in igniting, on igniting plug (2-3), be embedded with igniting plug packing washer (2-2), be threaded connection on igniter chamber body (2-1), the first electrode (2-4) is arranged in igniting plug (2-3), away from one end of igniting combustion chamber body (2-1), stretch out igniting plug (2-3), insulation spacer (2-7) is arranged on the first electrode (2-4) near one end of igniter chamber body (2-1), insulating sleeve (2-6) and insulation spacer (2-7) wrap the first electrode (2-4), igniting presses spiral shell (2-8) to stretch into igniting plug (2-3), push down insulation spacer (2-7), third electrode (2-9) presses spiral shell (2-8) to be fixedly connected with the first electrode (2-4) with insulation spacer (2-7) through igniting, the second electrode (2-5) is fixedly connected on the one end that is positioned at third electrode (2-9) on igniting plug (2-3), and the 4th electrode (2-10) is fixedly connected on the one end that is positioned at the first electrode (2-4) on igniting plug (2-3), the first electrode (2-4) is connected the pulse power with the second electrode (2-5), and third electrode (2-9) is connected the nichrome wire through igniter pad (2-11) with the 4th electrode (2-10), pressure limiting diaphragm (2-12) is arranged between igniter chamber body (2-1) and main chamber (1).
3. a kind of end row's propellant transient state pressure release burning unstability characteristic test device according to claim 1, is characterized in that: described temperature measurement component (3) comprises thermometric plug (3-1), gasket seal (3-2), metal sleeve (3-3), encapsulation pad (3-4), thermometric pressure spiral shell (3-5), medicinal strip clamping plate (3-6), low-grade fever galvanic couple (3-7), medicinal strip to be measured (3-8), trip bolt (3-9) and dog screw (3-10), gasket seal (3-2) is enclosed within on thermometric plug (3-1), thermometric plug (3-1) is threaded connection on main chamber (1), medicinal strip clamping plate (3-6) are fixed on thermometric plug (3-1), on medicinal strip clamping plate (3-6), be fixed with medicinal strip to be measured (3-8), metal sleeve (3-3) is arranged in thermometric plug (3-1), its inner chamber is filled up by epoxy glue, encapsulation pad (3-4) covers metal sleeve (3-3), thermometric presses spiral shell (3-5) to push down encapsulation pad (3-4) and by being threaded into thermometric plug (3-1), thermometric presses the inner chamber of spiral shell (3-5) to fill up high-temp glue, the probe of low-grade fever galvanic couple (3-7) inserts in medicinal strip to be measured (3-8), the other end is pressed spiral shell (3-5) through thermometric successively, encapsulation pad (3-4), metal sleeve (3-3) and thermometric plug (3-1), by high temperature wire, be connected to thermocouple temperature measurement instrument (10).
4. a kind of end row's propellant transient state pressure release burning unstability characteristic test device according to claim 1, is characterized in that: described pressure release assembly (4) comprises little pressure release plug (4-1), large pressure release plug (4-2), shears diaphragm (4-3) and gasket seal (4-4); Gasket seal (4-4) is enclosed within on large pressure release plug (4-2), large pressure release plug (4-2) is threaded connection on main chamber (1), shearing diaphragm (4-3) puts on the threaded hole shoulder of large pressure release plug (4-2), little pressure release plug (4-1) screws in the threaded hole of large pressure release plug (4-2), compresses the shearing diaphragm (4-3) between little pressure release plug (4-1) and large pressure release plug (4-2).
5. a kind of end row's propellant transient state pressure release burning unstability characteristic test device according to claim 1, is characterized in that: described main chamber (1) comprises main chamber body (1-1), pad (1-2), transparent windows (1-3), blind flange (1-4) and fastening bolt (1-5); On main chamber body (1-1), there is view window base, transparent windows (1-3) is fixed on view window base by blind flange (1-4) and fastening bolt (1-5), between view window base and transparent windows (1-3) and between transparent windows (1-3) and blind flange (1-4), pad (1-2) is set.
6. a kind of end row's propellant transient state pressure release burning unstability characteristic test device according to claim 1, is characterized in that: between described pressure transducer (5) and data acquisition unit (11), charge amplifier (9) is set.
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