CN109374307A - A kind of visualization cold air impact experiment apparatus - Google Patents
A kind of visualization cold air impact experiment apparatus Download PDFInfo
- Publication number
- CN109374307A CN109374307A CN201811211717.5A CN201811211717A CN109374307A CN 109374307 A CN109374307 A CN 109374307A CN 201811211717 A CN201811211717 A CN 201811211717A CN 109374307 A CN109374307 A CN 109374307A
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- Prior art keywords
- combustion chamber
- cold air
- piston
- bottom plate
- spring
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Classifications
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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
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
- G01M15/106—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases using pressure sensors
-
- 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
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
- G01M15/108—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases using optical methods
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Engines (AREA)
Abstract
The invention discloses a kind of visualization cold air impact experiment apparatus, including being equipped with the combustion chamber of rectangular enclosure, the first flange for being separately fixed at combustion chamber front and back end, second flange；First flange and converting interface are connected；Converting interface is connected by latch and air accumulator；Gas is provided by the nitrogen cylinder that ventilation pipe connects in air accumulator, and ventilation pipe section is equipped with control valve；Control valve mainly includes pressure reducing valve and safety valve；Combustion chamber includes side plate, top plate and bottom plate；Two constitute rectangular enclosure between side plate and top plate and bottom plate；Side plate is made of transparent material；Bottom plate is equipped with multiple pressure sensors from front to back；Main charge is filled in combustion chamber, bottom plate is equipped with multiple connecting holes, and main charge is fixed in the combustion chamber；Main charge is equipped with multiple foil gauges；High-speed camera and schlieren are equipped with outside combustion chamber.The present invention simulation engine combustion chamber working condition can change under cold air percussion.
Description
Technical field
The invention belongs to solid propellant rocket propellant structure field, especially a kind of visualization cold air impact experiment dress
It sets.
Background technique
Rocket engine is the power plant of rocket, missile flight, is mainly filled by combustion chamber, igniter, propellant
The components such as medicine and jet pipe composition has the features such as structure is simple, at low cost, easy to maintain quick, quick-reaction capability is strong.Solid
Rocket motor ignition is the important stage of solid propellant rocket work, and ignition process has instantaneity and complexity.Igniting
The safety and reliability of process determines the normal work of solid propellant rocket, be judge engine quality it is important according to
According to.
The ignition process of solid propellant rocket contains ignition-delay period, flame propagation phase and combustion chamber full of the phase three
Stage, while also with irregular phenomenons such as superpressure, hangfire, burning concussions, it is a sufficiently complex process.At the initial stage of ignition,
For the shock wave that ignition charge conflagration is formed in motor charge surface, the pressurization of transient state can be to motor charge
Structural intergrity, which has some impact on, even to be destroyed, while microdefect may be formed inside powder charge, reduces bullet in engine
The reproducibility in road influences the working performance of engine.
Reappear true ignition procedure and need to expend a large amount of preparation, while there is certain risk.Cold air punching
Hitting experiment basic principle is in the case where not considering gas temperature, and the initial pressure peak generated by energy-storage system is to experiment mesh
Mark impact, thus reach simulated engine really light a fire generation initial pressure peak generate moment impact effect, be that one kind is ground
Study carefully igniter shock effect simple and efficient method.Cold air impact test apparatus at this stage is mostly opaque or translucent structure
It makes, is unable to satisfy the use of the optical measuring apparatus such as schlieren, the measurement of part physical phenomenon in Transient Process of Bump is caused to be caught
Catch method missing.
Summary of the invention
The purpose of the present invention is to provide a kind of visualization cold air impact experiment apparatus, are being rushed a little with simulating propellant loading
The impact effect for the initial pressure peak moment that fire generates, analysis engine internal pressure of combustion chamber distribution rule under cold air percussion
Situations such as rule, propellant stress and displacement.
The technical solution for realizing the aim of the invention is as follows:
A kind of visualization cold air impact experiment apparatus, the combustion chamber including being equipped with rectangular enclosure, is separately fixed at combustion chamber
First flange, the second flange of front and back end, converting interface, latch, air accumulator, control valve and gas cylinder；The first flange with
Converting interface is connected；The converting interface is that circle turns square interface, is connected by latch and air accumulator；The air accumulator is through ventilation pipe
It is connect with control valve with gas cylinder；The second flange center is equipped with rectangular opening, and rectangular opening size and rectangular enclosure are in the same size；
The combustion chamber includes the side plate for being located at front and back end, top plate and bottom plate；Two constitute burning between side plate and top plate and bottom plate
The rectangular enclosure of room；The side plate is made of transparent material；The bottom plate is equipped with multiple mounting holes from front to back；In mounting hole
Equipped with pressure sensor, to detect pressure law in cold air percussion lower combustion chamber；Filled with master in the combustion chamber
Powder charge, bottom plate are equipped with multiple connecting holes, and self-tapping screw is fixed in the combustion chamber by main charge by connecting hole；The main charge
On be adhesive with multiple foil gauges, to detect the stress that main charge under cold air percussion generates；Height is equipped with outside the combustion chamber
Fast video camera and schlieren, respectively to measure the displacement and the indoor flow field change of burning that main charge generates under cold air percussion
Change.
Compared with prior art, the present invention its remarkable advantage:
(1) experimental provision of the invention can simulate igniting combustion gas to the percussion of propellant loading, and carrying out to it can
It is studied depending on changing, makes up the deficiency that existing research method is not available measuring method.
(2) experimental provision of the invention can realize gas passage by replacing entrance transfer mouth according to test needs
The change of area, shape adjusts the parameters such as impact strength in combination with gas pressure in air accumulator.
Present invention is further described in detail with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is the main view of visualization cold air impact test apparatus of the invention.
Fig. 2 is the main view of combustion chamber.
Fig. 3 is the top view of combustion chamber.
Fig. 4 is combustion chamber top plate schematic front view.
Fig. 5 is combustion chamber soleplate schematic top plan view.
Fig. 6 is second flange front sectional view.
Fig. 7 is second flange left view.
Fig. 8 is latch front sectional view.
Specific embodiment
In order to illustrate technical solution of the present invention and technical purpose, with reference to the accompanying drawing and specific embodiment is the present invention
It is further to introduce.
In conjunction with Fig. 1-Fig. 7, a kind of visualization cold air impact experiment apparatus of the invention, the burning including being equipped with rectangular enclosure
Room, the first flange 4 for being separately fixed at combustion chamber front and back end, second flange 5, converting interface 6, latch 7, air accumulator 8, control valve
Door 10 and gas cylinder 11；The first flange 4 is connected with converting interface 6；The converting interface 6 is that circle turns square interface, by latch 7 with
Air accumulator 8 is connected；The air accumulator 8 is connect through ventilation pipe 9 and control valve 10 with gas cylinder 11；5 center of second flange
Equipped with rectangular opening, rectangular opening size is in the same size with rectangular enclosure, and enabling burning, indoor air flow is smooth passes through.The burning
Room includes the side plate 1, top plate 2, bottom plate 3 for being located at front and back end；Combustion chamber is constituted between two side plates 1 and top plate 2, bottom plate 3
Rectangular enclosure；The side plate 1 is made of transparent material.The bottom plate 3 is equipped with multiple mounting hole 3-1 from front to back；Installation
Pressure sensor is equipped in the 3-1 of hole, to detect pressure law in cold air percussion lower combustion chamber；It is filled out in the combustion chamber
Filled with main charge, bottom plate 3 is equipped with multiple connecting hole 3-2, and self-tapping screw is fixed in the combustion chamber by main charge by connecting hole,
Main charge is avoided to deviate；Multiple foil gauges are adhesive on the main charge, to detect main charge generation under cold air percussion
Stress；It is equipped with high-speed camera and schlieren outside the combustion chamber, is produced respectively to measure main charge under cold air percussion
Raw displacement and the indoor flow field change of burning.
In conjunction with Fig. 8, the latch 7 includes fixing seat 71, baffle 72, piston cylinder 73, piston 74, striker 75, locked machine
Structure, metallic membrane 76, bracket 77, the first spring 78；
Described 73 one end of piston cylinder and fixing seat 71 are connected, and the other end is connected with converting interface 6；It is set inside the piston cylinder 73
There is metallic membrane 76, to be sealed；One end is equipped with the first spring 78 in the piston cylinder 73；The baffle 72 is fixed on fixation
In the centre bore of seat 71, axially position is carried out to piston cylinder 73 and 78 one end of the first spring；First spring, 78 other end and piston
74 are connected；The striker 75 is connected by bracket 77 with piston 74；The locking mechanism is arranged on piston cylinder 73, passes through piston
Cylinder 73 locks piston 74；Locking mechanism is opened, piston 74 drives striker 75 to metallic membrane 76 under the effect of the first spring 78
Operation, striker 75 puncture metallic membrane 76, and 8 mesohigh gas of air accumulator flows rapidly into experiment percussion mechanism.
Further, the locking mechanism includes fastening bolt 79, slide mass 80, locking cylinder 81, second spring 82, top
Column 83；The locking cylinder 81 is fixed on piston cylinder 73, and the setting of slide mass 80 is in locking cylinder 81, the locking gas
Second spring 82 is equipped between 81 bottom of cylinder and slide mass 80；80 bottom plate of slide mass is fixed with top pillar 83；The top pillar 83
It is contacted across piston cylinder 73 with piston 74；Fastening bolt 79 pushes down slide mass 80, and slide mass 80 compresses second spring 82；Top pillar 83
Piston 74 is blocked；Unscrew fastening bolt 79,80 upward sliding of slide mass, under the effect of second spring 82, top pillar 83 and piston
74 separation, locking mechanism are opened.
Preferably, the material using light transmittance greater than 90% of the side plate 1 is made.
Preferably, the side plate 1 uses optical quartz glass, tempered glass, organic glass (polymethyl methacrylate)
Equal materials, selected material can proof strength require (anti-HI high impact), while meeting light transmittance requirement.
Further, the top plate 2, multiple fixing seats 7 are equipped on bottom plate 3, fixing seat 7 is equipped with threaded hole, will
It is fastenedly connected between top plate 2, bottom plate 3 and side plate 1, guarantees bonding strength, and be additionally provided between side plate 1 and top plate 2, bottom plate 3 close
Packing is fastened by bolts compacting, guarantees leakproofness.
Further, for some shock sensive main charges, the main charge bottom is additionally provided with pedestal, self-tapping screw
It is connected by connecting hole with pedestal, main charge is fixed in the combustion chamber.
Before experiment, impact experiment model is fixed in simulated combustion room, and according to experiment demand in experimental model, simulation
The internal measurements equipment such as placement sensor in combustion chamber.Striker in experimental system inside Locked segment is adjusted to compressive state,
Then metallic membrane is mounted on the striker front end after retracting, group section and simulated combustion room section is finally installed, by experimental facilities
Completed assembled.Meanwhile being required according to measuring device, it is external that high-speed camera, schlieren, light etc. are placed around experimental provision
Measuring device.Then, nitrogen cylinder and valve are opened, is flowed into high pressure gas in caisson, control valve include pressure reducing valve and
Safety valve, by gas pressure intensity in pressure reducing valve and safety valve control air accumulator, closing control valve after inflation.
When experiment, the mobile mobile top fastening bolt of latch, release striker makes its fast forward movement crash through metallic membrane.Metal
Diaphragm generates destruction under the collective effect of high speed striker and high pressure gas, and higher-pressure region gas quickly flows into the combustion of II pulsed motor
Interior is burnt, percussion, and the fast propagation in II pulse-combustion room are generated to experimental model.Simultaneously.Using pressure sensor,
The measurement of the test equipments such as high speed camera bat, schlieren captures, records required experiment parameter.
Claims (6)
1. a kind of visualization cold air impact experiment apparatus, which is characterized in that the combustion chamber including being equipped with rectangular enclosure is fixed respectively
First flange (4), second flange (5) in combustion chamber front and back end, converting interface (6), latch (7), air accumulator (8), control valve
Door (10) and gas cylinder (11)；The first flange (4) and converting interface (6) are connected；The converting interface (6) is that circle turns square interface, is led to
Latch (7) and air accumulator (8) are crossed to be connected；The air accumulator (8) is through ventilation pipe (9) and control valve (10) and gas cylinder (11)
Connection；Second flange (5) center is equipped with rectangular opening, and rectangular opening size and rectangular enclosure are in the same size；The combustion chamber packet
Include the side plate (1), top plate (2), bottom plate (3) for being located at front and back end；Structure between two side plates (1) and top plate (2), bottom plate (3)
At the rectangular enclosure of combustion chamber；The side plate (1) is made of transparent material；The bottom plate (3) is equipped with multiple peaces from front to back
It fills hole (3-1)；Pressure sensor is equipped in mounting hole (3-1), to detect pressure distribution rule in cold air percussion lower combustion chamber
Rule；Main charge is filled in the combustion chamber, bottom plate (3) is equipped with multiple connecting holes (3-2), and self-tapping screw will by connecting hole
Main charge is fixed in the combustion chamber；Multiple foil gauges are adhesive on the main charge, to detect main charge under cold air percussion
The stress of generation；High-speed camera and schlieren are equipped with outside the combustion chamber, it is main under cold air percussion to measure respectively
The displacement and the indoor flow field change of burning that powder charge generates.
2. visualization cold air impact experiment apparatus according to claim 1, which is characterized in that the latch (7) includes
Fixing seat (7) 1, baffle (72), piston cylinder (73), piston (74), striker (75), locking mechanism, metallic membrane (76), bracket
(77), the first spring (78)；
Described piston cylinder (73) one end and fixing seat (71) are connected, and the other end is connected with converting interface (6)；In the piston cylinder (73)
Portion is equipped with metallic membrane (76), to be sealed；The interior one end of the piston cylinder (73) is equipped with the first spring (78)；The baffle
(72) it is fixed in the centre bore of fixing seat (71), axially position is carried out to piston cylinder (73) and the first spring (78) one end；The
One spring (78) other end is connected with piston (74)；The striker (75) is connected by bracket (77) with piston (74)；The lock
Crash structure is arranged on piston cylinder (73), passes through piston cylinder (73) piston (74) are locked；Locking mechanism is opened, piston (74) exists
Under first spring (78) effect, striker (75) is driven to run to metallic membrane (76), striker (75) punctures metallic membrane (76), stores up
Gas tank (8) mesohigh gas flows rapidly into experiment percussion mechanism.
3. visualization cold air impact experiment apparatus according to claim 1, which is characterized in that the locking mechanism includes tight
Fixing bolt (79), slide mass (80), locking cylinder (81), second spring (82), top pillar (83)；The locking cylinder (81) is fixed
On piston cylinder (73), slide mass (80) setting is in locking cylinder (81), the locking cylinder (81) bottom and sliding
Second spring (82) are equipped between body (80)；Slide mass (80) bottom plate is fixed with top pillar (83)；The top pillar (83) passes through
Piston cylinder (73) is contacted with piston (74)；Fastening bolt (79) is pushed down slide mass (80), and slide mass (80) compresses second spring
(82)；Top pillar (83) blocks piston (74)；It unscrews fastening bolt (79), slide mass (80) upward sliding, in second spring
(82) under acting on, top pillar (83) is separated with piston (74), and locking mechanism is opened.
4. visualization cold air impact experiment apparatus according to claim 1, which is characterized in that the use of the side plate (1)
Material of the light transmittance greater than 90% is made.
5. visualization cold air impact experiment apparatus according to claim 1, which is characterized in that the side plate (1) uses light
Learn quartz glass, tempered glass or organic glass.
6. visualization cold air impact experiment apparatus according to claim 1, which is characterized in that the top plate (2), bottom plate
(3) be equipped on multiple fixing seats (7), fixing seat (7) be equipped with threaded hole, by top plate (2), bottom plate (3) and side plate (1) it
Between be fastenedly connected；And side plate (1) and top plate (2), bottom plate are additionally provided with gasket between (3), are fastened by bolts compacting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811211717.5A CN109374307A (en) | 2018-10-18 | 2018-10-18 | A kind of visualization cold air impact experiment apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811211717.5A CN109374307A (en) | 2018-10-18 | 2018-10-18 | A kind of visualization cold air impact experiment apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN109374307A true CN109374307A (en) | 2019-02-22 |
Family
ID=65400736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811211717.5A Pending CN109374307A (en) | 2018-10-18 | 2018-10-18 | A kind of visualization cold air impact experiment apparatus |
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| Country | Link |
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| CN (1) | CN109374307A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111678769A (en) * | 2020-07-13 | 2020-09-18 | 南京理工大学 | Gas impact type composite material crack simulation test device and method |
| CN113375945A (en) * | 2021-06-18 | 2021-09-10 | 广西玉柴机器股份有限公司 | Simulation engine backfire generating device |
| CN116735386A (en) * | 2023-06-19 | 2023-09-12 | 北京理工大学 | Free-filling solid propellant ignition impact visual test device and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4981033A (en) * | 1990-05-04 | 1991-01-01 | Yang Lien C | Gage for rocket motor data acquisition |
| EP0987418A2 (en) * | 1998-09-15 | 2000-03-22 | Beru AG | System for the heating and measuring of ion currents and glowplugs for this system |
| CN104975985A (en) * | 2015-07-09 | 2015-10-14 | 南京理工大学 | Solid rocket engine igniting test device |
| CN105157848A (en) * | 2015-07-31 | 2015-12-16 | 南京理工大学 | Device for measuring temperature of solid propellant during laser loading by using infrared thermometer |
| CN106053083A (en) * | 2016-06-06 | 2016-10-26 | 南京理工大学 | Solid engine cool-air impact experimental device |
| CN107796631A (en) * | 2016-09-05 | 2018-03-13 | 南京理工大学 | A kind of stopper formula dipulse engine cold air impact experiment apparatus and its experimental method |
-
2018
- 2018-10-18 CN CN201811211717.5A patent/CN109374307A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4981033A (en) * | 1990-05-04 | 1991-01-01 | Yang Lien C | Gage for rocket motor data acquisition |
| EP0987418A2 (en) * | 1998-09-15 | 2000-03-22 | Beru AG | System for the heating and measuring of ion currents and glowplugs for this system |
| CN104975985A (en) * | 2015-07-09 | 2015-10-14 | 南京理工大学 | Solid rocket engine igniting test device |
| CN105157848A (en) * | 2015-07-31 | 2015-12-16 | 南京理工大学 | Device for measuring temperature of solid propellant during laser loading by using infrared thermometer |
| CN106053083A (en) * | 2016-06-06 | 2016-10-26 | 南京理工大学 | Solid engine cool-air impact experimental device |
| CN107796631A (en) * | 2016-09-05 | 2018-03-13 | 南京理工大学 | A kind of stopper formula dipulse engine cold air impact experiment apparatus and its experimental method |
Non-Patent Citations (2)
| Title |
|---|
| 宋仕雄: "低温状态点火瞬间固体发动机药柱结构响应分析", 《固体火箭技术》 * |
| 邓康清: "自由装填式固体火箭发动机药柱低温点火结构完整性分析", 《固体火箭技术》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111678769A (en) * | 2020-07-13 | 2020-09-18 | 南京理工大学 | Gas impact type composite material crack simulation test device and method |
| CN111678769B (en) * | 2020-07-13 | 2022-12-13 | 南京理工大学 | Gas impact type composite material crack simulation test device and method |
| CN113375945A (en) * | 2021-06-18 | 2021-09-10 | 广西玉柴机器股份有限公司 | Simulation engine backfire generating device |
| CN116735386A (en) * | 2023-06-19 | 2023-09-12 | 北京理工大学 | Free-filling solid propellant ignition impact visual test device and method |
| CN116735386B (en) * | 2023-06-19 | 2024-04-19 | 北京理工大学 | Free-filling solid propellant ignition impact visual test device and method |
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Application publication date: 20190222 |
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