CN106053083B - A kind of solid engines cold air impact experiment apparatus - Google Patents
A kind of solid engines cold air impact experiment apparatus Download PDFInfo
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- CN106053083B CN106053083B CN201610393318.XA CN201610393318A CN106053083B CN 106053083 B CN106053083 B CN 106053083B CN 201610393318 A CN201610393318 A CN 201610393318A CN 106053083 B CN106053083 B CN 106053083B
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- pressure
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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
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
Abstract
The invention discloses a kind of solid engines cold air impact experiment apparatus, including high pressure nitrogen tank, scratch pad air accumulator, removable fixing bracket, pneumatically-locked device, electric push rod, bindiny mechanism, test engine, pressure sensor, amplifying circuit and data collecting card；High pressure nitrogen tank is connect by tracheae with scratch pad air accumulator, pneumatically-locked device both ends are connect with scratch pad air accumulator and bindiny mechanism respectively by flange, end of holding one's breath is connect with electric push rod, bindiny mechanism's other end is connect with test engine, test engine is equipped with several pressure sensors, and pressure sensor is connect with amplifying circuit and data collecting card successively；All components are arranged on removable fixing bracket.The present invention, by measuring each position pressure of engine in real time, can preferably solve the engine ignition stage, complex pressure is difficult to the engineering roadblock measured in engine in the simulated engine course of work.
Description
Technical field
The invention belongs to Engine Block Test fields, and in particular to a kind of solid engines cold air impact experiment apparatus.
Background technology
When engine ignition, in tens to hundreds of milliseconds, chamber pressure increases to rapidly more than 100 by 1 atmospheric pressure
Atmospheric pressure, under the adverse circumstances of this high temperature, high pressure and high strain-rate, the logarithmic strain by test measurement powder column is extremely tired
It is difficult.
Tang Guojin etc. exists《The design and application of the cold pressurized test system of solid propellant rocket》（Solid-rocket technology
34.4(2011):423-425.）In one text design and it is self-service have developed solid propellant rocket cold air pressurized test system, this is
System pressurizes to powder column inner cavity using high pressure gas, simulated engine ignition pressurization process, realizes the strain of powder column inner surface
Real-time measurement.But as described herein, pilot system is pressurizeed by quick high-pressure solenoid valve, and response speed is
50ms, but response speed is slower, is not enough to simulation igniter shock transient response, and change pressure structure mode is needed to meet transient state
The mechanical characteristic of impact.
Yang Chen etc. exists《Solid propellant rocket cold air impact process numerical analysis》（Sichuan war industry's journal, 2015 (11)）
The high-pressure peak pair generated with simulated engine ignition transient using industrial nitrogen impact solid rocket motor grain in one text
The compression shock of engine wall surface, the pressure distribution in the work of analysis mode solid propellant rocket.But it is not referred in text
The concrete function how test engine constructs and realize, and then can not be tested.
Invention content
It is worked in simulated engine the purpose of the present invention is to provide a kind of solid engines cold air impact experiment apparatus
Cheng Zhong can preferably solve the engine ignition stage, be answered in engine by measuring each position pressure of engine in real time
Miscellaneous pressure is difficult to the engineering roadblock measured.
Realize that the technical solution of the object of the invention is：A kind of solid engines cold air impact experiment apparatus, including height
Pressure nitrogen gas tank, scratch pad air accumulator, removable fixing bracket, pneumatically-locked device, electric push rod, bindiny mechanism, experiment are started
Machine, pressure sensor, amplifying circuit and data collecting card；High pressure nitrogen tank is connect by tracheae with scratch pad air accumulator, pneumatically
Dead lock both ends are connect with scratch pad air accumulator and bindiny mechanism respectively by flange, and end of holding one's breath is connect with electric push rod, even
The connection mechanism other end is connect with test engine, and test engine is equipped with several pressure sensors, and pressure sensor is successively
It is connect with amplifying circuit and data collecting card；High pressure nitrogen tank, scratch pad air accumulator, pneumatically-locked device, electric push rod, connection
Mechanism and test engine are arranged on removable fixing bracket.
High pressure gas of the pneumatically-locked device when being closed in sealing scratch pad air accumulator, is pulled pneumatic by electric push rod
Dead lock makes it be latched the gas outlet moment of cylinder 4-1 opening, by bindiny mechanism, gas moment is made to pour test engine
In, pressure sensor acquires the pressure signal of test engine, converts pressure signal to electric signal and sends amplifying circuit to, puts
Big circuit is sent into data collecting card after amplifying electric signal, data collecting card converts electrical signals to digital signal, and input calculates
Machine, to obtain real-time pressure data inside test engine.
The bindiny mechanism includes connecting tube and nozzle, and connecting tube one end is connected by flange and pneumatically-locked device, another
End is connected by screw thread and test engine, and nozzle is threadedly secured to one end inner wall being connected with test engine.
The test engine includes motor body, grate, pressure sensor connector, powder column, end cap and pressure relief opening,
Motor body one end is connect by screw thread with connecting tube, and the other end is equipped with end cap, and two grate intervals are fixed on engine
In shell, powder column is arranged in the engine shell body between two grates, divides on the motor body between two grates
Several pressure sensor interfaces of cloth, pressure sensor connector are fixed on pressure sensor interface, and pressure sensor setting exists
On pressure sensor connector, pressure relief opening is arranged on motor body.
The grate is annular slab.
The pressure sensor connector includes fixed seat and screwed pipe, and screwed pipe one end is equipped with fixed seat, the other end and hair
Motivation shell is connected by screw thread, and fixed seat is connected to equipped with circular hole with screwed pipe with screwed pipe joint face, and pressure sensor is solid
It is scheduled in fixed seat.
The pressure sensor connector further includes extension pipe, and extension pipe is connected and communicates with the other end of screwed pipe.
The pneumatically-locked device includes dead lock cylinder, dead lock piston body, slide mass, top fastening bolt and connecting rod, dead lock cylinder
Center is equipped with location hole, and dead lock piston body is inserted into the location hole of dead lock cylinder, and locking is stretched out in the self-positioning hole bottom in bottom
Device cylinder, slide mass are fixed at the top of dead lock piston body, and top fastening bolt is pressed in slide body top across connecting rod, and passes through screw thread and company
One end of bar connects, and the other end of connecting rod is connect with electric push rod.
Compared with prior art, the present invention its remarkable advantage is：（1）In the simulated engine course of work, pass through reality
When measure each position pressure of engine, can preferably solve the engine ignition stage, complex pressure is difficult in engine
The engineering roadblock of measurement.
（2）Structure design is simple, is meeting basic experiment requirement, can change gas by changing nozzle form
Body sprays form；By changing grain configuration in engine, different powder column internal pressures or external pressure are tested；By processing wiring on end cap
Device can facilitate extraction to be affixed on the foil gauge line of grain surface, measure grain surface strain-responsive.
（3）Pilot system passes through accurate theoretical calculation and high precision machines is processed when designing processing, it is sufficient to
Ensure security and stability of the entire pilot system under high testing pressure；And entire experiment system design is succinct, only needs 2
The experiment personnel of grinding easily can build and operate.
Description of the drawings
Fig. 1 is solid engines cold air impact experiment apparatus work structure diagram of the present invention.
Fig. 2 is solid engines cold air impact experiment apparatus bindiny mechanism of the present invention and test engine structural schematic diagram.
Fig. 3 is the pneumatically-locked device structural schematic diagram of solid engines cold air impact experiment apparatus of the present invention.
Specific implementation mode
Present invention is further described in detail below in conjunction with the accompanying drawings.
In conjunction with Fig. 1, Fig. 2 and Fig. 3, a kind of solid engines cold air impact experiment apparatus of the present invention, including high pressure nitrogen tank
1, scratch pad air accumulator 2, removable fixing bracket 3, pneumatically-locked device 4, electric push rod 5, bindiny mechanism 6, test engine
7, pressure sensor, amplifying circuit 8 and data collecting card 9；High pressure nitrogen tank 1 is connect by tracheae with scratch pad air accumulator 2, gas
Dynamic 4 both ends of dead lock are connect with scratch pad air accumulator 2 and bindiny mechanism 6 respectively by flange, and end of holding one's breath connects with electric push rod 5
It connects, 6 other end of bindiny mechanism is connect with test engine 7, and test engine 7 is equipped with several pressure sensors, and pressure passes
Sensor is connect with amplifying circuit 8 and data collecting card 9 successively；High pressure nitrogen tank 1, scratch pad air accumulator 2, pneumatically-locked device 4, electricity
Dynamic push-pull rod 5, bindiny mechanism 6 and test engine 7 are bolted on removable fixing bracket 3.
High pressure gas of the pneumatically-locked device 4 when being closed in sealing scratch pad air accumulator 2, is pulled by electric push rod 5
Pneumatically-locked device 4 makes it be latched the gas outlet moment of cylinder 4-1 opening, by bindiny mechanism 6, gas moment is made to pour experiment
In engine 7, pressure sensor acquires the pressure signal of test engine 7, converts pressure signal to electric signal and sends to and puts
Big circuit 8, amplifying circuit 8 are sent into data collecting card 9 after amplifying electric signal, and data collecting card 9 converts electrical signals to number
Signal inputs computer, to obtain 7 inside real-time pressure data of test engine.
Bindiny mechanism 6 includes connecting tube 6-1 and nozzle 6-2, and the one end connecting tube 6-1 is solid by flange and pneumatically-locked device 4
Even, the other end is connected by screw thread and test engine 7, and nozzle 6-2 is threadedly secured to one to be connected with test engine 7
Hold inner wall.
The test engine 7 includes motor body 7-1, grate 7-2, pressure sensor connector 7-3, powder column, end
7-4 and pressure relief opening 7-5 is covered, the one end motor body 7-1 is connect by screw thread with connecting tube 6-16-1, and the other end is equipped with end cap 7-
4, two intervals grate 7-2 are fixed in motor body 7-1, and the engine between two grate 7-2 is arranged in powder column
In shell 7-1, it is distributed several pressure sensor interfaces, pressure sensing on the motor body 7-1 between two grate 7-2
Device connector 7-3 is fixed on pressure sensor interface, and pressure sensor is arranged on pressure sensor connector 7-3, pressure relief opening 7-5
It is arranged on motor body 7-1.
The grate 7-2 is annular slab.
The pressure sensor connector 7-3 includes fixed seat and screwed pipe, and screwed pipe one end is equipped with fixed seat, the other end with
Motor body 7-1 is connected by screw thread, and fixed seat is connected to equipped with circular hole with screwed pipe with screwed pipe joint face, pressure sensing
Device is fixed in fixed seat.
The pressure sensor connector 7-3 further includes extension pipe, and extension pipe is connected and communicates with the other end of screwed pipe.
The pneumatically-locked device 4 include dead lock cylinder 4-1, dead lock piston body 4-2, slide mass 4-3, top fastening bolt 4-4 and
Connecting rod 4-5, dead lock cylinder 4-1 are boss shape, and base diameter is small, and center is equipped with the variable diameters location hole through top and bottom,
Dead lock piston body 4-2 is inserted into the location hole of dead lock cylinder 4-1, and the self-positioning hole bottom in bottom is stretched out, and slide mass 4-3 is ten
Font, the tops dead lock piston body 4-2 are equipped with fixing groove, and slide mass 4-3 is fixed by screws at the top of dead lock piston body 4-2
In fixing groove, stretches into, be pressed at the top of slide mass 4-3 across connecting rod 4-5, and pass through at the top of the self-positioning hole of screw rod of top fastening bolt 4-4
Screw thread is connect with one end of connecting rod 4-5, and the other end of connecting rod 4-5 is connect with electric push rod 5.When connecting rod 4-5 is in electric push-and-pull
Under the pulling of bar 5, top fastening bolt 4-4 is driven to move left and right so that slide mass 4-3 is detached from the compacting on the left sides top fastening bolt 4-4, and dead lock is lived
Cock body 4-2 and slide mass 4-3 under pneumatic pressure, are moved upwards so that gas can smoothly enter into test engine 7.
Embodiment 1
In conjunction with Fig. 1, Fig. 2 and Fig. 3, a kind of solid engines cold air impact experiment apparatus of the present invention, including high pressure nitrogen tank
1, scratch pad air accumulator 2, removable fixing bracket 3, pneumatically-locked device 4, electric push rod 5, bindiny mechanism 6, test engine
7, pressure sensor, amplifying circuit 8 and data collecting card 9.High pressure nitrogen tank 1 is connect by tracheae with scratch pad air accumulator 2, gas
Dynamic 4 both ends of dead lock are connect with scratch pad air accumulator 2 and bindiny mechanism 6 respectively by flange, and end of holding one's breath connects with electric push rod 5
It connects, 6 other end of bindiny mechanism is connect with test engine 7, is set on test engine 7 there are five pressure sensor, pressure sensing
Device is connect with amplifying circuit 8 and data collecting card 9 successively；It is high pressure nitrogen tank 1, scratch pad air accumulator 2, pneumatically-locked device 4, electronic
Push-pull rod 5, bindiny mechanism 6 and test engine 7 are bolted on removable fixing bracket 3.
High pressure gas of the pneumatically-locked device 4 when being closed in sealing scratch pad air accumulator 2, is pulled by electric push rod 5
Pneumatically-locked device 4 makes it be latched the gas outlet moment of cylinder 4-1 opening, by bindiny mechanism 6, gas moment is made to pour experiment
In engine 7, pressure sensor acquires the pressure signal of test engine 7, converts pressure signal to electric signal and sends to and puts
Big circuit 8, amplifying circuit 8 are sent into data collecting card 9 after amplifying electric signal, and data collecting card 9 converts electrical signals to number
Signal inputs computer, to obtain 7 inside real-time pressure data of test engine.
High pressure nitrogen tank 1 releases the high pressure nitrogen that pressure is 2MPa and passes through the gas of closure into scratch pad air accumulator 2
Dynamic dead lock 4, is temporarily stored into scratch pad air accumulator 2, and controlling electric push rod 5 by motor pulls dead lock 4, opens air pressure and deposits
Storage device 2 makes gas moment pour in test engine 7, circular tube shaped medicine is housed, it is therefore desirable to test in test engine 7
7-3 sensor connectors are installed on engine 7 and are connected with the sensor connector of extension pipe, are connected to test engine 7 at this time
On pressure sensor collect output voltage signal after the pressure signal of pipe medicine inner cavity and exocoel, the voltage signal is by putting
Big circuit 8, is converted into digital signal by data collecting card 9 and digital signal is inputed to computer, letter is recorded in real time by software
Number.
9 collected signal of data collecting card is finally shown by software, at the beginning of the voltage signal of pressure sensor output
Moment beginning is 0s, pressure 0V（It is converted into 0MPa）, voltage signal reaches peak value in 0.02s, and pressure is 2.44V and 2.28V
（Converted about 1MPa and 0.9MPa, because there are the pressure losses）, whole process takes 0.15s, and pressure is reduced to 0V at this time.It is logical
Crossing to monitor 7 internal pressure of test engine in real time can simulate under actual engine igniter shock load, internal pressure and medicine
Column strain path can be tested for Real Rocket engine ignition and provide accurate fact references foundation.
Embodiment 2
In conjunction with Fig. 1, Fig. 2 and Fig. 3, a kind of solid engines cold air impact experiment apparatus of the present invention, including high pressure nitrogen tank
1, scratch pad air accumulator 2, removable fixing bracket 3, pneumatically-locked device 4, electric push rod 5, bindiny mechanism 6, test engine
7, pressure sensor, amplifying circuit 8 and data collecting card 9.High pressure nitrogen tank 1 is connect by tracheae with scratch pad air accumulator 2, gas
Dynamic 4 both ends of dead lock are connect with scratch pad air accumulator 2 and bindiny mechanism 6 respectively by flange, and end of holding one's breath connects with electric push rod 5
It connects, 6 other end of bindiny mechanism is connect with test engine 7, and test engine 7 is equipped with 3 pressure sensors, pressure sensor
It is connect successively with amplifying circuit 8 and data collecting card 9；High pressure nitrogen tank 1, pneumatically-locked device 4, electronic pushes away scratch pad air accumulator 2
Pull rod 5, bindiny mechanism 6 and test engine 7 are bolted on removable fixing bracket 3.
High pressure gas of the pneumatically-locked device 4 when being closed in sealing scratch pad air accumulator 2, is pulled by electric push rod 5
Pneumatically-locked device 4 makes it be latched the gas outlet moment of cylinder 4-1 opening, by bindiny mechanism 6, gas moment is made to pour experiment
In engine 7, pressure sensor acquires the pressure signal of test engine 7, converts pressure signal to electric signal and sends to and puts
Big circuit 8, amplifying circuit 8 are sent into data collecting card 9 after amplifying electric signal, and data collecting card 9 converts electrical signals to number
Signal inputs computer, to obtain 7 inside real-time pressure data of test engine.
High pressure nitrogen tank 1 releases the high pressure nitrogen that pressure is 2MPa and passes through the gas of closure into scratch pad air accumulator 2
Dynamic dead lock 4, is temporarily stored into scratch pad air accumulator 2, and controlling electric push rod 5 by motor pulls dead lock 4, opens air pressure and deposits
Storage device 2 makes gas moment pour in test engine 7, and test engine 7 is packed into similar by removing grate 7-2 herein
Adherent casting medicine only has powder column inner cavity at this time in engine, the installation on test engine 7 is only needed to be connected with extension pipe at this time
Sensor connector 7-3.The pressure sensor being connected on test engine 7 only collects the pressure signal of pipe medicine inner cavity,
Then output voltage signal, the voltage signal pass through amplifying circuit 8, are converted into digital signal by data collecting card 9 and will be digital
Signal inputs to computer, passes through the real-time tracer signal of software.
The present invention, can be preferable by measuring each position pressure of engine in real time in the simulated engine course of work
Ground solves the engine ignition stage, and complex pressure is difficult to the engineering roadblock measured in engine.
Structure design is simple, is meeting basic experiment requirement, can change gas spray by changing nozzle form
Go out form；By changing grain configuration in engine, different powder column internal pressures or external pressure are tested；By processing electric wire connecting junction on end cap,
Extraction can be facilitated to be affixed on the foil gauge line of grain surface, measure grain surface strain-responsive.
Pilot system passes through accurate theoretical calculation and high precision machines is processed, it is sufficient to ensure when designing processing
Entire security and stability of the pilot system under high testing pressure；And entire experiment system design is succinct, only needs 2 experiments
The personnel of grinding easily can build and operate.
Claims (6)
1. a kind of solid engines cold air impact experiment apparatus, it is characterised in that：Including high pressure nitrogen tank (1), scratch pad gas storage
Tank (2), removable fixing bracket (3), pneumatically-locked device (4), electric push rod (5), bindiny mechanism (6), test engine
(7), pressure sensor, amplifying circuit (8) and data collecting card (9)；High pressure nitrogen tank (1) passes through tracheae and scratch pad air accumulator
(2) it connects, pneumatically-locked device (4) both ends are connect respectively with scratch pad air accumulator (2) and bindiny mechanism (6) by flange, held one's breath
End is connect with electric push rod (5), and bindiny mechanism's (6) other end is connect with test engine (7), bindiny mechanism (6) packet
Connecting tube (6-1) and nozzle (6-2) are included, connecting tube one end (6-1) is connected by flange and pneumatically-locked device (4), and the other end is logical
It crosses screw thread to be connected with test engine (7), nozzle (6-2) is threadedly secured in the one end being connected with test engine (7)
Wall, test engine (7) are equipped with several pressure sensors, and pressure sensor is acquired with amplifying circuit (8) and data successively
Block (9) connection；High pressure nitrogen tank (1), scratch pad air accumulator (2), pneumatically-locked device (4), electric push rod (5), bindiny mechanism
(6) it is arranged on removable fixing bracket (3) with test engine (7)；
High pressure gas of the pneumatically-locked device (4) when being closed in sealing scratch pad air accumulator (2), is drawn by electric push rod (5)
It takes offence dynamic dead lock (4), so that it is latched the gas outlet moment of cylinder (4-1) and open, by bindiny mechanism (6), make gas moment
It pours in test engine (7), pressure sensor acquires the pressure signal of test engine (7), converts pressure signal to electricity
Signal sends amplifying circuit (8) to, and amplifying circuit (8) is sent into data collecting card (9), data collecting card after amplifying electric signal
(9) digital signal is converted electrical signals to, computer is inputted, to obtain the internal real-time pressure data of test engine (7).
2. solid engines cold air impact experiment apparatus according to claim 1, it is characterised in that：The test engine
(7) include motor body (7-1), grate (7-2), pressure sensor connector (7-3), powder column, end cap (7-4) and pressure relief opening
(7-5), motor body one end (7-1) are connect by screw thread with connecting tube (6-1), and the other end is equipped with end cap (7-4), two gears
Medicine plate (7-2) interval is fixed in motor body (7-1), the engine shell that powder column is arranged between two grates (7-2)
In body (7-1), it is distributed several pressure sensor interfaces, pressure on the motor body (7-1) between two grates (7-2)
Sensor connector (7-3) is fixed on pressure sensor interface, and pressure sensor is arranged on pressure sensor connector (7-3),
Pressure relief opening (7-5) is arranged on motor body (7-1).
3. solid engines cold air impact experiment apparatus according to claim 2, it is characterised in that：Grate (the 7-
2) it is annular slab.
4. solid engines cold air impact experiment apparatus according to claim 2, it is characterised in that：The pressure sensor
Connector (7-3) includes fixed seat and screwed pipe, and screwed pipe one end is equipped with fixed seat, and the other end passes through with motor body (7-1)
Screw thread is connected, and fixed seat is connected to equipped with circular hole with screwed pipe with screwed pipe joint face, and pressure sensor is fixed in fixed seat.
5. solid engines cold air impact experiment apparatus according to claim 4, it is characterised in that：The pressure sensor
Connector (7-3) further includes extension pipe, and extension pipe is connected and communicates with the other end of screwed pipe.
6. solid engines cold air impact experiment apparatus according to claim 1, it is characterised in that：The pneumatically-locked device
(4) include dead lock cylinder (4-1), dead lock piston body (4-2), slide mass (4-3), top fastening bolt (4-4) and connecting rod (4-5), close
It locks the center device cylinder (4-1) and is equipped with location hole, dead lock piston body (4-2) is inserted into the location hole of dead lock cylinder (4-1), bottom
Dead lock cylinder (4-1) is stretched out in self-positioning hole bottom, and slide mass (4-3) is fixed at the top of dead lock piston body (4-2), top fastening bolt
(4-4) is pressed in across connecting rod (4-5) at the top of slide mass (4-3), and is connect with one end of connecting rod (4-5) by screw thread, connecting rod (4-
5) the other end is connect with electric push rod (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610393318.XA CN106053083B (en) | 2016-06-06 | 2016-06-06 | A kind of solid engines cold air impact experiment apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610393318.XA CN106053083B (en) | 2016-06-06 | 2016-06-06 | A kind of solid engines cold air impact experiment apparatus |
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| CN106053083A CN106053083A (en) | 2016-10-26 |
| CN106053083B true CN106053083B (en) | 2018-11-13 |
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| CN107290112A (en) * | 2017-05-02 | 2017-10-24 | 北京理工大学 | A kind of engine valve performance testing device and method |
| CN108554307A (en) * | 2018-06-01 | 2018-09-21 | 郑州格德格瑞机械工程有限公司 | A kind of gravity type wheat measurer |
| CN109141888B (en) * | 2018-08-14 | 2020-04-28 | 南京理工大学 | Simulation test engine in high-speed rotating platform |
| CN109374307A (en) * | 2018-10-18 | 2019-02-22 | 南京理工大学 | A kind of visualization cold air impact experiment apparatus |
| CN110486191A (en) * | 2019-07-01 | 2019-11-22 | 中国人民解放军96901部队24分队 | A kind of large-sized solid rocket Structural Integrity of Propellant Grains test method and device |
| 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 |
| CN113623087A (en) * | 2021-07-22 | 2021-11-09 | 湖北航天化学技术研究所 | Portable solid engine cold supercharging test system |
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