CN105911213A - Constant-pressure apparatus used in testing of burning rate of solid propellant - Google Patents
Constant-pressure apparatus used in testing of burning rate of solid propellant Download PDFInfo
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- CN105911213A CN105911213A CN201610213355.8A CN201610213355A CN105911213A CN 105911213 A CN105911213 A CN 105911213A CN 201610213355 A CN201610213355 A CN 201610213355A CN 105911213 A CN105911213 A CN 105911213A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
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Abstract
The invention discloses a constant-pressure apparatus used in testing of the burning rate of a solid propellant. The constant-pressure apparatus is composed of a combustion chamber, a pedestal, a plurality of cylinders and a weight disk, wherein the combustion chamber is fixedly connected with the pedestal; a sealing ring is installed at the joint of the pedestal and a flange of the sidewall of the combustion chamber; two cylindrical cylinders are symmetrically installed at two sides of the combustion chamber, and two same rubber pistons are arranged in the cylinders; one end of a support bar is connected with a groove located on the outer bottom of the weight disk, and the other end of the support bar is connected with the two rubber pistons in the cylinders; the distance between the two rubber pistons is adjustable; the combustion chamber is connected with the cylinders through arc circular pipes; the side wall of the combustion chamber is provided with a nitrogen filling hole, a gas vent, a sensor connection hole and a vacuum pump connection hole which are respectively connected with a high-pressure nitrogen cylinder, an exhaust valve, a pressure sensor and a vacuum pump; and a propellant strip is fixed in a groove located on the pedestal in the combustion chamber. The constant-pressure apparatus is simple in structure and convenient to dismount; combustion products in a cleaning device are easy to clean, which is beneficial for maintenance of the apparatus; and testing precision is improved.
Description
Technical field
The present invention relates to solid propellant rocket low voltage experiment technical field, specifically, relate to a kind of solid propellant
Burning rate testing constant-voltage equipment.
Background technology
Combustion speed is a core technology index of solid propellant, is also a weight in rocket engine interior trajectory design
Want performance parameter, therefore generally require the combustion speed to propellant when propellant formulation regulation and batch production and test, with
Confirm the combustion speed of propellant.The combustion speed of solid propellant typically increases with the rising of pressure, and fires speed and the satisfied dimension of pressure
Also exponential law in
R=apn
In formula, r is the combustion speed of propellant；A is burning rate coefficient；N is burning rate pressure exponent.Therefore, to learn propellant
Burning rate test, need the combustion speed value under the different pressure of test, the most again by the matching of experiment value obtain burning rate coefficient and
Burning rate pressure exponent value.
Solid propellant burning velocity testing method mainly has constant voltage bullet method, motor method and closed burner method, wherein constant voltage
Bullet method is owing to having spy with low cost, that test result accuracy high, Data Processing in Experiment convenient, pressure range applicability is strong
Point, and become the most widely used method of current solid propellant burning velocity testing.Constant voltage bullet method can be divided into again target by timing principles
Collimation method, acoustic-emission and supercritical ultrasonics technology, wherein, target collimation method and acoustic-emission are method in national military standard GJB770B-2005 respectively
706.1, the method introduced in method 706.2, its test pressure range is 1～25MPa, the basic and burning pressure of conventional propellant
Strong scope is consistent, and both approaches is all by the way of the surge flask that combustion chamber is bigger with several volumes is connected simultaneously,
Realize the constant of combustion chamber pressure during propellant combustion.
Along with rocket engine and the development of propellant technology, to some propellant, as oxidizing combustible propellant its
Operating pressure is minimum up to about 0.2MPa, owing to the combustion speed of oxidizing combustible propellant is higher, and the generation speed of under low pressure combustion gas
Rate is the biggest.From The Ideal-Gas Equation, for the combustion gas of same molar, pressure is the highest, and its shared volume is also
The biggest, therefore to when under low pressure, the combustion speed of propellant is tested, general fluctuation of pressure is bigger, it is difficult to meet in test process
The requirement of constant voltage.If keeping constant voltage by the volume and pipeline diameter increasing surge flask, then the volume of surge flask can be very big,
Make whole test device the heaviest.It addition, the Burning rate testing for propellant it has been generally acknowledged that pressure range is below 5MPa,
High Voltage 5MPa is 25 times of minimum pressure, if by can keep under minimum pressure invariablenes pressure of liquid to set the volume of surge flask,
Then very big due to the volume of surge flask, can there is voltage stabilizing gas waste serious phenomenon in the test experiments under high pressure.
Summary of the invention
In order to avoid under solid propellant low pressure in prior art, Burning rate testing process exists pressure and is difficult to constant problem,
The present invention proposes a kind of solid propellant burning velocity testing constant-voltage equipment.
The technical solution adopted for the present invention to solve the technical problems is: includes combustion chamber, base, cylinder, scale pan, prop up
Strut, rubber piston, fixing nut, arc pipe, ignition wire, ignitor, propellant medicinal strip, sealing ring, described combustion chamber
For U-shaped structure, opening end circumferential side wall flange being evenly equipped with four screws, two cylindrical cylinder are positioned at combustion chamber bilateral symmetry
Installing, combustion chamber and cylinder are connected by arc pipe and communicate, and sidewall of combustion chamber is provided with nitrogen air-filled pore, steam vent, sensor
Connect hole and vavuum pump connects hole, and be connected with high-pressure nitrogen bottle, air bleeding valve, pressure transducer and vavuum pump respectively；Described cylinder
Being built-in with two external diameter rubber pistons identical with cylinder bore diameter, rubber piston two ends have fixing nut respectively, by regulation two
The spacing of nut regulates the decrement of rubber piston；Described support bar is threaded rod, support bar one end and scale pan outer bottom
Circular fixed groove threaded, the support bar other end is positioned at cylinder and is connected with two rubber pistons respectively, two rubber
Between piston, spacing is adjustable；Boss, boss centre is had to have square groove in the middle of described base, equidistant according to base axle center
It is connected that extension has four screws to fit through bolt respectively with the screw on sidewall of combustion chamber flange, and propellant medicinal strip is fixed on the end
In the groove of seat boss, the top of propellant medicinal strip is installed with ignition wire, and ignition wire two ends are respectively wound around on two ignitors.
Circumferentially distributed at least two along combustion chamber, described cylinder.
Described base boss diameter is identical with combustion chamber internal diameter.
Described sealing ring is arranged on base and sidewall of combustion chamber flange junction.
Beneficial effect
The solid propellant burning velocity testing constant-voltage equipment that the present invention proposes, is made by the volume-adjusting member of constant-voltage equipment
Pressure keeps constant, the Stationary Random Environments of pressure in combustion chamber during maintenance propellant combustion；Its compared with prior art just like
Lower feature:
(1) need not the surge flask of large volume to make pressure keep constant, the volume of combustion chamber and cylinder is the least, is subtracting
Decrease the usage amount of voltage stabilizing gas nitrogen while few device volume, there is preferable economic benefit.
(2) size of combustion chamber is less, to becoming the propellant that tolerance is high, the combustion by propellant of the Burning rate testing under low pressure
Burn, it is achieved combustion chamber from supercharging, thoroughly break away from the use of nitrogen, thus save great many of experiments cost.
(3) introduce vacuum extractor, can effectively get rid of the air impact on Burning rate testing result in combustion chamber, effectively carry
High measuring accuracy.
(4) typically can generate corrosive hydrogen chloride gas during propellant combustion, often can cause the corrosion of device.And for
The condensed phase combustion product of fuel-rich propellant is more, makes pipeline be prone to blocking and causes experiment danger to increase.The present invention is permanent
The pipeline of pressure device is simple, the convenient dismounting of cylinder, it is easy to the maintenance of the combustion product in cleaning plant, beneficially device.
Accompanying drawing explanation
With embodiment, one solid propellant burning velocity testing constant-voltage equipment of the present invention is made further below in conjunction with the accompanying drawings
Describe in detail.
Fig. 1 is solid propellant burning velocity testing constant-voltage equipment schematic diagram of the present invention.
Fig. 2 is the partial enlarged drawing of Fig. 1.
Fig. 3 is the base schematic diagram of solid propellant burning velocity testing constant-voltage equipment of the present invention.
In figure
1. counterweight 2. scale pan 3. support bar 4. cylinder 5. rubber piston 6. fixes nut 7. arc pipe 8. nitrogen
Gas air-filled pore 9. steam vent 10. combustion chamber 11. ignitor 12. base 13. sensor connects hole 14. vavuum pump and connects hole
15. ignition wire 16. propellant medicinal strip 17. sealing rings
Detailed description of the invention
The present embodiment is a kind of solid propellant burning velocity testing constant-voltage equipment.
Refering to Fig. 1, Fig. 2, Fig. 3, the present embodiment solid propellant burning velocity testing constant-voltage equipment is arranged on Special-purpose bench, with
Ensure the steady operation of device during experiment test.Combustion chamber 10 is bolted to connection with base 12, and by being placed in base
The sealing ring 17 at groove position ensures the air-tightness between combustion chamber 10 and base 12.Boss is had, in boss in the middle of base 12
There is square groove at heart position, has four screws according to the isometrical extension in base axle center, and with four screws on sidewall of combustion chamber flange
Coordinating, combustion chamber 10 is connected by bolt with base 12.Have on the sidewall of combustion chamber 10 nitrogen air-filled pore 8, steam vent 9,
Sensor connects hole 13 and vavuum pump connects hole 14, and by nitrogen air-filled pore 8, steam vent 9, sensor connects hole 13 and vavuum pump connects hole
14 are connected with high-pressure nitrogen bottle, air bleeding valve, pressure transducer and vavuum pump respectively.Propellant medicinal strip 16 is fixed on base boss
On groove in, the top of propellant medicinal strip 16 is installed with ignition wire 15, and the two ends of ignition wire 15 are respectively wound around two ignition power
On pole 11, by applying voltage on two ignitors 11, propellant medicinal strip 16 is lighted a fire.Combustion chamber 10 leads to cylinder 4
Cross arc pipe 7 connection to communicate.Cylinder 4 is built-in with two external diameter rubber pistons identical with cylinder bore diameter 5, rubber piston 5 liang
End is equipped with fixing nut 6 respectively, and support bar 3 is through the endoporus of rubber piston 5 with fixing nut 6, by two fixing spiral shells of regulation
The spacing of female 6 regulates the decrement of rubber piston 5, realizes the sealing of cylinder；Support bar 3 is threaded rod, support bar 3 one end with
The circular fixed groove of scale pan 2 outer bottom is threaded, the support bar other end be positioned at cylinder respectively with two rubber pistons 5
Connecting, between two rubber pistons 5, spacing is adjustable.Two rubber pistons 5 it are furnished with support bar to ensure to live in each cylinder 4
Plug stable movement.
During experiment test, according to the difference of propellant combustion gas generating amount, the adjustable gas being connected with combustion chamber 10
Cylinder 4 number, it is achieved the Burning rate testing to different propellants.Before experiment test, scale pan 2 adds the counterweight 1 of Different Weight,
Test the minimum counterbalance mass keeping piston static under each predetermined experiment pressure, complete the staking-out work of experiment.Experiment
Time propellant medicinal strip burn in a combustion chamber, burning generate gas the stress not releveling of piston can be made upwards to move
It is dynamic, so that the pressure of combustion chamber 10 keeps constant.
Example one
The boron-based fuel-rich that the present embodiment uses Boron contents to be 35%, as the test specimen of Burning rate testing, advances
The cuboid of agent medicinal strip a size of 4 × 4 × 150mm, test pressure is the combustion speed of propellant under 0.2MPa.Chamber diameter is
50mm, a height of 200mm, quantity N=2 of cylinder, cylinder bore diameter d0=65mm, cylinder length L0=1.5m, piston external diameter D1=
65mm, piston inner diameter d1=30mm, piston length L1=40mm, in scale pan, counterbalance mass is 115kg.
Constant-voltage equipment is arranged on Special-purpose bench, the steady operation of device during to ensure experiment test.By each for combustion chamber zero
After parts have assembled, close high pressure nitrogen charge valve and the air bleeding valve of combustion chamber, meanwhile, open vavuum pump, and pass through vacuum
Combustion chamber is vacuumized by pump, discharges the air in combustion chamber.Two ignitors being connected with propellant medicinal strip are applied 20V's
Voltage, lights propellant medicinal strip, and along with the burning of propellant medicinal strip, in combustion chamber, pressure is rapidly achieved 0.2MPa by normal pressure, and
It is that 0.2MPa terminates to the burning of propellant medicinal strip by the pressure of the mobile maintenance combustion chamber of piston.At this experiment bar
Under part, it is not necessary to high pressure nitrogen just can be tested, source of the gas cost can be saved.The height of whole constant-voltage equipment is less than 1.7m,
It is easy to the assembling of constant-voltage equipment and to the placement of counterweight in scale pan.Constant-voltage equipment and connecting line simple in construction, it is simple to advance
The cleaning of agent combustion product.And, experiment counterbalance mass used is less, can realize one man operation.
Example two
The present embodiment uses Boron contents to be that the boron-based fuel-rich of 35% is as test specimen, COMPOSITE SOLID PROPELLANT bar size
It is the cuboid of 4 × 4 × 150mm, tests the combustion speed that its pressure is propellant under 5MPa.Chamber diameter is 50mm, a height of
200mm, quantity N=2 of cylinder, cylinder bore diameter d0=24mm, cylinder length L0=1.0m, piston external diameter D1=24mm, in piston
Footpath d1=12mm, piston length L1=40mm, in scale pan, counterbalance mass is 397kg.
After each for combustion chamber parts are assembled, close the air bleeding valve of combustion chamber, meanwhile, open vavuum pump to combustion chamber
Vacuumize, discharge the air in combustion chamber.Then open high pressure nitrogen charge valve in combustion chamber, be filled with nitrogen, when in combustion chamber
Pressure when reaching 5MPa, close high pressure nitrogen charge valve.Apply the voltage of 20V to two ignitors, light propellant medicinal strip,
Along with the burning of propellant medicinal strip, piston constantly moves up, and in maintenance combustion chamber, pressure is that 5MPa is to COMPOSITE SOLID PROPELLANT
Bar burning terminates.Due to the small volume of combustion chamber, experiment nitrogen amount used is less, and source of the gas cost is relatively low.In view of pressure relatively
Time high, counterbalance mass is relatively big, and cylinder length arranges less, makes the height of whole constant-voltage equipment less than 1.3m, it is simple to constant-voltage equipment
Assembling and the placement of big mass weight.Constant-voltage equipment and connecting line are simple, it is simple to the cleaning of propellant combustion product.
Example three
The present embodiment uses aluminium content to be that the composite propellant of 17% is as test specimen, COMPOSITE SOLID PROPELLANT bar a size of 4 × 4
The cuboid of × 150mm, when test pressure is the combustion speed of propellant under 1MPa, in scale pan, counterbalance mass is 52kg, test
Combustion speed under 5MPa.Chamber diameter is 50mm, a height of 200mm, quantity N=4 of cylinder, cylinder bore diameter d0=15mm, cylinder is long
Degree L0=1.5m, piston external diameter D1=15mm, piston inner diameter d1=8mm, piston length L1=40mm, counterbalance mass in scale pan
For 342kg.
After each for combustion chamber parts are assembled, close the air bleeding valve of combustion chamber, meanwhile, open vavuum pump and combustion chamber is taken out
Vacuum, discharges the air in combustion chamber.Then open high pressure nitrogen charge valve in combustion chamber, be filled with nitrogen, when in combustion chamber
When pressure is 5MPa, close high pressure nitrogen charge valve.Apply the voltage of 20V to two ignitors, light propellant medicinal strip, along with
The burning of propellant medicinal strip, piston constantly moves, and in maintenance combustion chamber, pressure is that 5MPa is to propellant medicinal strip burning knot
Bundle.Due to the small volume of combustion chamber, experiment nitrogen amount used is less, and source of the gas cost is relatively low.Consider that aluminized propellant burning is produced
Raw gas flow is relatively big, and the quantity of cylinder is set to 4, makes the cylinder length will not be long.The height of constant-voltage equipment is less than
1.8m, it is convenient to carry out assembling and the placement of big mass weight of constant-voltage equipment.
Claims (4)
1. a solid propellant burning velocity testing constant-voltage equipment, it is characterised in that: include combustion chamber, base, cylinder, scale pan,
Support bar, rubber piston, fixing nut, arc pipe, ignition wire, ignitor, propellant medicinal strip, sealing ring, described burning
Room is U-shaped structure, and opening end circumferential side wall flange is evenly equipped with four screws, and two cylindrical cylinder are positioned at both sides pair, combustion chamber
Claiming to install, combustion chamber and cylinder are connected by arc pipe and communicate, and sidewall of combustion chamber is provided with nitrogen air-filled pore, steam vent, sensing
Device connects hole and vavuum pump connects hole, and is connected with high-pressure nitrogen bottle, air bleeding valve, pressure transducer and vavuum pump respectively；Described gas
Cylinder is built-in with two external diameter rubber pistons identical with cylinder bore diameter, and rubber piston two ends have fixing nut respectively, by regulation
The spacing of two nuts regulates the decrement of rubber piston；Described support bar is threaded rod, support bar one end and scale pan outer bottom
The circular fixed groove in portion is threaded, and the support bar other end is positioned at cylinder and is connected with two rubber pistons respectively, two rubbers
Between glue piston, spacing is adjustable；Boss, boss centre is had to have square groove in the middle of described base, equidistant according to base axle center
Having four screws to fit through bolt respectively with the screw on sidewall of combustion chamber flange from extension to be connected, propellant medicinal strip is fixed on
In the groove of base boss, the top of propellant medicinal strip is installed with ignition wire, and ignition wire two ends are respectively wound around two ignitors
On.
Solid propellant burning velocity testing constant-voltage equipment the most according to claim 1, it is characterised in that: described cylinder is along burning
Circumferentially distributed at least two of room.
Solid propellant burning velocity testing constant-voltage equipment the most according to claim 1, it is characterised in that: described base boss is straight
Footpath is identical with combustion chamber internal diameter.
Solid propellant burning velocity testing constant-voltage equipment the most according to claim 1, it is characterised in that: described sealing ring is installed
In base and sidewall of combustion chamber flange junction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610213355.8A CN105911213B (en) | 2016-04-07 | 2016-04-07 | A kind of solid propellant burning velocity testing constant-voltage equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610213355.8A CN105911213B (en) | 2016-04-07 | 2016-04-07 | A kind of solid propellant burning velocity testing constant-voltage equipment |
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| CN105911213B CN105911213B (en) | 2018-01-02 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107328598A (en) * | 2017-08-29 | 2017-11-07 | 南京磁谷科技有限公司 | A kind of adjustable constant-pressure load testing device |
| CN109801544A (en) * | 2019-01-31 | 2019-05-24 | 燕山大学 | A kind of carbonate rock forming environment condition simulation experimental provision and its application method |
| CN110376245A (en) * | 2019-07-08 | 2019-10-25 | 常州大学 | A kind of visual combustion chamber |
| CN111208255A (en) * | 2020-02-24 | 2020-05-29 | 北京理工大学 | Visual high-pressure burning rate instrument and method for multiple solid propellant drug strips |
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| CN108663475A (en) * | 2018-05-18 | 2018-10-16 | 西北工业大学 | A kind of real-time Burning rate testing apparatus and method of micro- powder column |
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| CN109801544A (en) * | 2019-01-31 | 2019-05-24 | 燕山大学 | A kind of carbonate rock forming environment condition simulation experimental provision and its application method |
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| CN111208255B (en) * | 2020-02-24 | 2021-01-05 | 北京理工大学 | Visual high-pressure burning rate instrument and method for multiple solid propellant drug strips |
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| CN105911213B (en) | 2018-01-02 |
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