CN107860511A - A kind of small Step Pressure generator of shock tube - Google Patents
A kind of small Step Pressure generator of shock tube Download PDFInfo
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- CN107860511A CN107860511A CN201711090473.5A CN201711090473A CN107860511A CN 107860511 A CN107860511 A CN 107860511A CN 201711090473 A CN201711090473 A CN 201711090473A CN 107860511 A CN107860511 A CN 107860511A
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- pressure
- membranes
- rupture
- low pressure
- shock
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
Abstract
The present invention relates to a kind of small Step Pressure generator of shock tube, belong to metrological testing technology.Including：High pressure chest, folder film machine, low pressure chamber, back pressure cavity and semo-infinite long tube；Also include transition apparatus and active rupture of membranes mechanism；Active rupture of membranes mechanism section is located in high pressure chest, and is contacted with folder film machine；Transition apparatus is located at low pressure chamber, and is contacted with folder film machine；The present invention is designed by transition apparatus, is effectively controlled rupture of membranes area, is realized the generation of small Step Pressure, while eliminates retardance whirlpool caused by imperfect rupture of membranes, caused shock wave is faster formed plane wave, so as to improve step plateau time.Effect is designed with using semo-infinite long tube and balances pressure in back pressure cavity and low pressure chamber, and avoids the incident shock after rupture of membranes before required Shock Step platform terminates in low pressure chamber from being delivered to back pressure cavity so as to influence real pressure difference step.The mould ratio fixed before rupture of membranes can be realized by the way of active rupture of membranes, improves the repeatability of experiment.
Description
Technical field
The present invention relates to a kind of small Step Pressure generator of shock tube, belong to metrological testing technology.
Background technology
Shock tube is a kind of classical dynamic pressure calibrator, it can be produced as Step Pressure generating means
Time very short Step Pressure is risen, and step wave rising edge ascending time can be (general in finite time within 0.1 microsecond
Within 10ms) plateau pressure is constant, and its amplitude can be calculated by initial parameters and shock velocity value, and the degree of accuracy is within 1%.But
Step Pressure amplitude is all relatively difficult to achieve in more than 10kPa, more low amplitude value caused by present.Simultaneously because many shock tubes are adopted at present
With the mode of passive rupture of membranes, lead to not obtain accurate hyperbaric chamber pressure condition.Reality is generally difficult to during shock tube experiment
Now complete rupture of membranes, thus whirlpool can be produced near diaphragm in incomplete rupture of membranes, and then the transmission of shock wave is influenceed, cause caused
Step Pressure platform shortens.
The content of the invention
The measurement that can not produce low order jump pressure magnitude the invention aims to solve prior art, and it is imperfect
Caused by rupture of membranes the problem of retardance whirlpool, there is provided a kind of small Step Pressure generator of shock tube.
The purpose of the present invention is achieved through the following technical solutions.
A kind of small Step Pressure generator of shock tube, including：High pressure chest, folder film machine, low pressure chamber, back pressure cavity and semo-infinite
Long tube；Also include transition apparatus and active rupture of membranes mechanism；
The active rupture of membranes mechanism including pricker and pilot seal pipe by forming；Pricker is placed in pilot seal pipe；It is main
Dynamic rupture of membranes mechanism is L-type structure；
The transition apparatus is provided with the pied geometry of trapezoidal hole for centre；
Active rupture of membranes mechanism section is located in high pressure chest, and is contacted with folder film machine；Transition apparatus is located at low pressure chamber, and with folder
Film machine contacts；
Beneficial effect
The present invention is designed by transition apparatus, is effectively controlled rupture of membranes area, is realized the generation of small Step Pressure, together
When eliminate retardance whirlpool caused by imperfect rupture of membranes, make caused by shock wave faster form plane wave, so as to improve step platform
Time.Effect is designed with using semo-infinite long tube and balances back pressure cavity and the pressure in low pressure chamber, and is swashed after avoiding rupture of membranes required
Incident shock before ripple step platform terminates in low pressure chamber is delivered to back pressure cavity so as to influence real pressure difference step.Using actively
The mode of rupture of membranes can realize the mould ratio fixed before rupture of membranes, improve the repeatability of experiment.
Brief description of the drawings
Fig. 1 is minute-pressure shock tube structural representation；
Fig. 2 is active rupture of membranes structural representation；
Fig. 3 is shock tube bottom face opening position pressure magnitude schematic diagram；
Fig. 4 is pressure magnitude schematic diagram at back pressure cavity endface position；
Fig. 5 is pressure distribution situation in shock wave transmittance process in shock tube when transition apparatus is not used；
Fig. 6 is pressure distribution situation in transmittance process in installation transition apparatus rear shock pipe.
Wherein, 1-high pressure chest, 2-folder film machine, 3-low pressure chamber, 4-back pressure cavity, 5-semo-infinite long tube, 6-transition dress
Put, 7-active rupture of membranes mechanism, 8-pricker, 9-pilot seal pipe.
Embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As shown in figure 1, a kind of small Step Pressure generator of shock tube, including：High pressure chest 1, folder film machine 2, low pressure chamber 3,
Back pressure cavity 4 and semo-infinite long tube 5；Also include transition apparatus 6 and active rupture of membranes mechanism 7；
High pressure chest 1 and low pressure chamber 3 are designed using cylindrical tube, and middle interconnecting piece point adds transition apparatus 6 and designed, and inwall is set
Oblique line construction is calculated as, diaphragm can be controlled to crush area and realize the appearance that whirlpool is avoided after imperfect rupture of membranes.Film machine 2 is pressed from both sides by film
Piece is placed in link position, and pricker 8 is placed in diaphragm rear end and is disposed vertically in diaphragm, the tip position alignment diaphragm center of circle, and uses
Hemispherical design, when the pressure difference in high pressure chest 1 and low pressure chamber 3 reaches desirable value, pricker 8 is promoted to realize active rupture of membranes, every time
Mould is born according to diaphragm in experimentation and selects suitable diaphragm than situation.Half nothing is used between low pressure chamber 3 and back pressure cavity 4
Limit for length's pipe connects 5 and connect, and pressure difference is not present in back pressure cavity 4 and low pressure chamber 3 during satisfaction.
It is that 11m, high pressure chest 1 and low pressure chamber 3 are connected by pressing from both sides film machine 2 and transition apparatus 6 with screw thread from shock tube total length
Connect, internal diameter 100mm, length is respectively 4m and 7m.
The 2 interior seal with elastometic washer of film machine is pressed from both sides, prevents that diaphragm position from leaking air phenomenon during the pressurising of high pressure chest 1,
The same O-ring that adds is sealed in threaded connection simultaneously.
Pricker 8 is drawn by pilot seal pipe 9, and needle point is designed as bias type apart from diaphragm 2cm positions, transition apparatus 6,
Angle of inclination is 12 °, total length 50mm.To realize small Step Pressure, by pressure magnitude control within 10kPa, low pressure
Chamber end is identical with low pressure chamber internal diameter, is 100mm.
The diaphragm of 2 supporting different-thickness of film machine is pressed from both sides, from 0.07mm to 1.8mm, it is possible to achieve different moulds are more broken than lower
The demand of film.By taking 0.07mm diaphragms as an example,
The course of work：
After 0.07mm diaphragm, caused rarefaction wave therefore reaches high with velocity of sound in high pressure indoor propagation after rupture of membranes
Time required for pressure chamber endface position is 11.7ms.
In high pressure chest, velocity of sound size is 329m/s, so the speed of reflection rarefaction wave is 384m/s.In the ideal case
Rarefaction wave reaches the time 21.6ms of bottom face, and now Step Pressure plateau time terminates, total time 14.6ms.
Reflected shock wave speed is 330m/s, reaches changeover portion and secondary reflection occurs, traveling to again needed for bottom face
The time wanted is 42ms, and now step platform is over, therefore the installation of changeover portion can't impact to Step Pressure.
Whirlpool occurs in tube chamber when being fitted without transition apparatus 6, pressure distribution is uneven, as shown in figure 5, can after installation transition apparatus 6
To be obviously improved intraluminal pressure distribution, ensure that the pressure platform time is not reflected by blast damage, as shown in Figure 6.
When back pressure cavity 4 is used for differential pressure (or micro- gauge pressure) pick up calibration a stable back pressure is provided to sensor.Half
Unlimited 5 one sections of long tube is drawn after the diaphragm of low pressure chamber 3 at 20cm, length 12m, is connected in back pressure cavity 4, is swashed by extending
Propagation time of the ripple in connecting pipe reaches the back pressure cavity time to delay shock wave, so as to which passage time dislocation prevents shock wave from reaching
The actual pressure difference Step Pressure platform experienced of differential pressure pick-up is destroyed after back pressure cavity.
Therefore, crush moment in diaphragm and start timing, the pressure at shock tube bottom position changes with time, with back pressure
Bottom of chamber end pressure changes over time as shown below：
It can be seen that shock wave reaches shock tube bottom face during 18.7ms after rupture of membranes, platform terminates during 33.3ms, shock wave during 50ms
Reach back pressure resonator end surface.Shock wave is formed at the low pressure chamber bottom face after pressure platform terminates, and shock wave just moves to back pressure resonator end surface
Position, therefore the plateau time needed for testing will not be impacted.
The small Step Pressure generator the key technical indexes of shock tube of design is based on more than：Pulse amplitude (1~
10) kPa, step platform is in more than 10ms.
Concrete operations are described as follows：
1) after laying O-ring in screw thread, diaphragm is installed；
2) changeover portion is installed in low pressure chamber, active film breaking unit is located in high pressure chest by L-type design, by high pressure
Chamber, presss from both sides film machine and low pressure chamber is assemblied together；
3) low pressure chamber is connected together by semo-infinite long tube with back pressure cavity, ensures that two chambers do not have pressure difference；
4) inflated into hyperbaric chamber, pressure monitoring is carried out to high pressure chest and low pressure chamber using pressure sensor, when reaching
Need to promote pricker during mould ratio, realize rupture of membranes；
5) Step Pressure monitoring is carried out by the pressure sensor at low pressure chamber bottom face；
6) gas exhaust in tube chamber is carried out by steam vent, high-low pressure section is separated when reaching equilibrium air pressure；
7) folder film machine upper diaphragm is changed, carries out repeating experiment.
There is no active rupture of membranes mechanism 7 and transition apparatus 6 in the case of other conditions identical；Low-pressure chamber keeps atmospheric pressure, to
Pressurising in hyperbaric chamber, until diaphragm crushes, it is about 1.1 not install the Mach number formed during transition apparatus, velocity of sound at normal temperatures
For 340m/s, therefore shock velocity is 374m/s.The length of low-pressure chamber is 7m, therefore since diaphragm is broken, shock wave reaches bottom
Time required for end face is 18.7ms.By transition apparatus, the reduction ratios for controlling diaphragm are 50%, and now diaphragm end is
50mm, Mach number can be caused to be reduced to 1.06, i.e., now the speed of incident shock is 360m/s, shock wave reach bottom face when
Between then extend to 19.4ms.
Above-described specific descriptions, the purpose, technical scheme and beneficial effect of invention are carried out further specifically
It is bright, it should be understood that the specific embodiment that the foregoing is only the present invention, the protection model being not intended to limit the present invention
Enclose, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., should be included in the present invention
Protection domain within.
Claims (2)
- A kind of 1. small Step Pressure generator of shock tube, it is characterised in that：Including：High pressure chest (1), folder film machine (2), low pressure chamber (3), back pressure cavity (4) and semo-infinite long tube (5)；Also include transition apparatus (6) and active rupture of membranes mechanism (7)；The active rupture of membranes mechanism (7) including pricker (8) and pilot seal pipe (9) by forming；Pricker (8) is placed on pilot seal Manage in (9)；Active rupture of membranes mechanism (7) is L-type structure；The transition apparatus (6) is provided with the pied geometry of trapezoidal hole for centre；Active rupture of membranes mechanism (7) partly contacts in high pressure chest (1), and with folder film machine (2)；Transition apparatus (6) is located at low pressure Chamber (3), and contacted with folder film machine (2).
- A kind of 2. small Step Pressure generator of shock tube as claimed in claim 1, it is characterised in that：The work of the generator It is as process：To high pressure chest (1) interior pressurising, pass through active rupture of membranes film breaking machine when the pressure in high pressure chest (1) reaches predetermined value Structure (7), which is realized, actively punctures film, and the shock wave that the transition apparatus (6) of installation can avoid the formation of in low pressure chamber (2) is in low pressure The nearly diaphragm position of chamber (2) produces whirlpool, so as to ensure that low pressure chamber (2) interior pressure is more uniformly spread, the Step Pressure platform of formation Time is longer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711090473.5A CN107860511B (en) | 2017-11-08 | 2017-11-08 | Shock tube micro step pressure generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711090473.5A CN107860511B (en) | 2017-11-08 | 2017-11-08 | Shock tube micro step pressure generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107860511A true CN107860511A (en) | 2018-03-30 |
| CN107860511B CN107860511B (en) | 2020-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711090473.5A Active CN107860511B (en) | 2017-11-08 | 2017-11-08 | Shock tube micro step pressure generator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827738A (en) * | 2019-04-10 | 2019-05-31 | 王春晖 | A kind of shock tube rupture of diaphragm device |
| CN112415228A (en) * | 2020-11-18 | 2021-02-26 | 中国航空工业集团公司北京长城计量测试技术研究所 | Step acceleration calibrating device based on shock tube |
| CN113092050A (en) * | 2021-04-06 | 2021-07-09 | 北京理工大学 | Low-resistance active membrane breaking device for shock tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109827738A (en) * | 2019-04-10 | 2019-05-31 | 王春晖 | A kind of shock tube rupture of diaphragm device |
| CN112415228A (en) * | 2020-11-18 | 2021-02-26 | 中国航空工业集团公司北京长城计量测试技术研究所 | Step acceleration calibrating device based on shock tube |
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| CN107860511B (en) | 2020-04-24 |
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