CN212254530U - Free molecular flow generation device for rarefied gas dynamic test - Google Patents
Free molecular flow generation device for rarefied gas dynamic test Download PDFInfo
- Publication number
- CN212254530U CN212254530U CN202021639665.4U CN202021639665U CN212254530U CN 212254530 U CN212254530 U CN 212254530U CN 202021639665 U CN202021639665 U CN 202021639665U CN 212254530 U CN212254530 U CN 212254530U
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- chamber
- free molecular
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- molecular flow
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- 238000000926 separation method Methods 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 102000004310 Ion Channels Human genes 0.000 claims abstract description 11
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 230000001133 acceleration Effects 0.000 claims abstract description 6
- 230000005684 electric field Effects 0.000 claims abstract description 6
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 35
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 description 14
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model discloses a free molecular flow generates device for rarefied gas dynamics is experimental. The generating device comprises a heating ionization chamber, a first separation chamber, an ion channel, an ion electric field acceleration chamber, an ion neutralization chamber, a second separation chamber, a free molecular flow channel and a test chamber which are sequentially arranged; the first separation chamber is divided into two branches and connected with the first electronic receiver, one branch is an ion channel, and the other branch is a first pumping section; the second separation chamber is also divided into two branches and connected with a second electron receiver, one branch is a free molecular flow channel, and the other branch is a second pumping section; the first suction section is communicated with the upper part of the test chamber, the free molecular flow channel is communicated with the test area of the test chamber, and the second suction section is communicated with the lower part of the test chamber; the test chamber is internally and symmetrically provided with cryogenic pumps, and the outside of the test chamber is provided with a molecular pump unit; the heating ionization chamber is communicated with the air inlet. The free molecular flow generated by the generating device can truly simulate extremely thin gas environment, and the structure is simple and reliable.
Description
Technical Field
The utility model belongs to the technical field of the rarefied gas dynamics is experimental, concretely relates to free molecular flow generates device for rarefied gas dynamics is experimental.
Background
The free molecular flow generating device is mainly used for simulating high-speed test airflow in an extremely thin gas environment of 120 kilometers above high altitude and is used for thin gas dynamics tests of satellites, spacecrafts and the like flying at a first cosmic speed or even higher. At present, high-temperature gas is adopted to form thin test airflow through Laval nozzle high-speed expansion, because the boundary layer of the nozzle is thick under the thin condition, the expanded airflow is difficult to form real free molecular flow, and the high-speed expanded gas molecules are difficult to reach the molecular energy of a first cosmic velocity, so that the difference with the actual flight simulation is larger.
Currently, there is a need to develop a free molecular flow generating device for lean gas dynamic experiments.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a free molecular flow generates device for rarefied gas dynamics is experimental is provided.
The utility model discloses a free molecular flow generates device for rarefied gas dynamics is experimental, its characteristics are: the generating device comprises a heating ionization chamber, a first separation chamber, an ion channel, an ion electric field acceleration chamber, an ion neutralization chamber, a second separation chamber, a free molecular flow channel and a test chamber which are sequentially arranged along the flow direction of the free molecular flow; the first separation chamber is divided into two branches, one branch is communicated with the ion channel, the other branch is communicated with the first suction section, and the first separation chamber is also connected with a first electronic receiver; the second separation chamber is also divided into two branches, one branch is communicated with the free molecular flow channel, the other branch is communicated with the second pumping section, and the second separation chamber is also connected with a second electron receiver; the first suction section is communicated with the upper part of the test chamber, the free molecular flow channel is communicated with a test area positioned on the axis of the test chamber, and the second suction section is communicated with the lower part of the test chamber; the upper part and the lower part in the test chamber are symmetrically provided with cryogenic pumps, and a molecular pump unit is arranged outside the test chamber; the heating ionization chamber is communicated with the air inlet.
Furthermore, the air inlet is externally connected with an inert gas source, a carbon dioxide gas source, a nitrogen gas source or an air gas source.
Furthermore, the air inlet is provided with a regulating valve and a stop valve.
Furthermore, the temperature range of the heating ionization chamber is between room temperature and 1000K.
Furthermore, the first separation chamber, the second separation chamber and the free molecular flow channel are all provided with a pressure sensor and a temperature sensor.
Furthermore, the molecular pump unit comprises a molecular pump fixed on the test chamber and an external foreline vacuum unit communicated through a pipeline.
Furthermore, the cryopump is a built-in cryopump and is divided into two layers, the inner-layer cryopump faces the test area, and the running medium is liquid nitrogen; the outer-layer cryogenic pump is tightly attached to the inner wall surface of the test chamber, and the operation medium is liquid helium.
The utility model discloses a free molecular stream of a free molecular stream generation device for rarefied gas dynamics is experimental generates the process as follows: the stop valve of the air inlet is opened, the gas flowing into the air inlet from the gas source is controlled by the adjusting valve, the gas generates ions, electrons and unionized gas molecules under the action of the heating ionization chamber and then enters the first separation chamber, the ions enter the ion channel, the electrons are received by the first electron receiver, and the unionized molecules sequentially enter the first suction section and the upper part of the test chamber to be recovered. Ions in the ion channel are accelerated by the ion electric field acceleration chamber, the ions enter the second separation chamber after being neutralized in the ion neutralization chamber, the second separation chamber comprises gas molecules, non-neutralized electrons and non-neutralized ions, the gas molecules enter a test area of the test chamber through the free molecular flow channel, the non-neutralized electrons are received by the second electron receiver, and the non-neutralized ions sequentially enter the second suction section and the lower part of the test chamber to be recovered.
The utility model discloses a free molecular stream that is used for thin gas dynamic experimental free molecular stream to generate device to generate can the extreme thin gas environment of true simulation, generates device simple structure, reliable.
Drawings
Fig. 1 is a schematic structural diagram of a free molecular flow generating device for a rarefied gas dynamic test according to the present invention.
In the figure, 1, an air inlet 2, a heating ionization chamber 3, a first separation chamber 4, a first electron receiver 5, a first pumping section 6, an ion channel 7, an ion electric field acceleration chamber 8, an ion neutralization chamber 9, a second separation chamber 10, a second electron receiver 11, a second pumping section 12, a molecular pump unit 13, a low-temperature pump 14, a test chamber 15 and a free molecular flow channel are arranged in the vacuum chamber.
Detailed description of the preferred embodiments
The present invention will be described in detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, the free molecular flow generating apparatus for the lean gas dynamic test of the present embodiment includes a thermal ionization chamber 2, a first separation chamber 3, an ion channel 6, an ion electric field acceleration chamber 7, an ion neutralization chamber 8, a second separation chamber 9, a free molecular flow channel 15, and a test chamber 14, which are sequentially arranged in the flow direction of the free molecular flow; the first separation chamber 3 is divided into two branches, one branch leads to an ion channel 6, the other branch leads to a first suction section 5, and the first separation chamber 3 is also connected with a first electron receiver 4; the second separation chamber 9 is also divided into two branches, one branch leads to the free molecular flow channel 15, the other branch leads to the second suction section 11, and the second separation chamber 9 is also connected with a second electron receiver 10; the first suction section 5 is communicated with the upper part of a test chamber 14, the free molecular flow channel 15 is communicated with a test area positioned on the axis of the test chamber 14, and the second suction section 11 is communicated with the lower part of the test chamber 14; the upper part and the lower part in the test chamber 14 are symmetrically provided with cryogenic pumps 13, and a molecular pump unit 12 is arranged outside the test chamber 14; the heating ionization chamber 2 communicates with the gas inlet 1.
Further, the air inlet 1 is externally connected with an inert gas source, a carbon dioxide gas source, a nitrogen gas source or an air gas source.
Further, the air inlet 1 is provided with a regulating valve and a stop valve.
Further, the temperature range of the heating ionization chamber 2 is room temperature-1000K.
Furthermore, the first separation chamber 3, the second separation chamber 9 and the free molecular flow channel 15 are all provided with a pressure sensor and a temperature sensor.
Further, the molecular pump assembly 12 includes a molecular pump fixed on the test chamber 14, and an external forevacuum assembly communicated with the molecular pump through a pipeline.
Further, the cryopump 13 is a built-in cryopump and is divided into two layers, the inner-layer cryopump faces the test area, and the operation medium is liquid nitrogen; the outer cryogenic pump is tightly attached to the inner wall surface of the test chamber 14, and the operation medium is liquid helium.
Claims (7)
1. A free molecular flow generating device for lean gas dynamic testing, comprising: the generating device comprises a heating ionization chamber (2), a first separation chamber (3), an ion channel (6), an ion electric field acceleration chamber (7), an ion neutralization chamber (8), a second separation chamber (9), a free molecular flow channel (15) and a test chamber (14) which are sequentially arranged along the flowing direction of the free molecular flow; the first separation chamber (3) is divided into two branches, one branch leads to the ion channel (6), the other branch leads to the first pumping section (5), and the first separation chamber (3) is also connected with a first electron receiver (4); the second separation chamber (9) is also divided into two branches, one branch leads to the free molecular flow channel (15), the other branch leads to the second pumping section (11), and the second separation chamber (9) is also connected with a second electron receiver (10); the first suction section (5) is communicated with the upper part of the test chamber (14), the free molecular flow channel (15) is communicated with a test area positioned on the axis of the test chamber (14), and the second suction section (11) is communicated with the lower part of the test chamber (14); the upper part and the lower part in the test chamber (14) are symmetrically provided with low-temperature pumps (13), and a molecular pump unit (12) is arranged outside the test chamber (14); the heating ionization chamber (2) is communicated with the air inlet (1).
2. The free molecular stream generating device for lean gas dynamic test according to claim 1, wherein: the air inlet (1) is externally connected with an inert gas source, a carbon dioxide gas source, a nitrogen gas source or an air gas source.
3. The free molecular stream generating device for lean gas dynamic test according to claim 1, wherein: the air inlet (1) is provided with a regulating valve and a stop valve.
4. The free molecular stream generating device for lean gas dynamic test according to claim 1, wherein: the temperature range of the heating ionization chamber (2) is room temperature-1000K.
5. The free molecular stream generating device for lean gas dynamic test according to claim 1, wherein: and the first separation chamber (3), the second separation chamber (9) and the free molecular flow channel (15) are respectively provided with a pressure sensor and a temperature sensor.
6. The free molecular stream generating device for lean gas dynamic test according to claim 1, wherein: the molecular pump unit (12) comprises a molecular pump fixed on the test chamber (14) and an external foreline vacuum unit communicated through a pipeline.
7. The free molecular stream generating device for lean gas dynamic test according to claim 1, wherein: the cryopump (13) is a built-in cryopump and is divided into two layers, the inner-layer cryopump faces a test area, and the running medium is liquid nitrogen; the outer-layer cryogenic pump is tightly attached to the inner wall surface of the test chamber (14), and the operation medium is liquid helium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021639665.4U CN212254530U (en) | 2020-08-10 | 2020-08-10 | Free molecular flow generation device for rarefied gas dynamic test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021639665.4U CN212254530U (en) | 2020-08-10 | 2020-08-10 | Free molecular flow generation device for rarefied gas dynamic test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212254530U true CN212254530U (en) | 2020-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021639665.4U Withdrawn - After Issue CN212254530U (en) | 2020-08-10 | 2020-08-10 | Free molecular flow generation device for rarefied gas dynamic test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111811767A (en) * | 2020-08-10 | 2020-10-23 | 中国空气动力研究与发展中心超高速空气动力研究所 | Free molecular flow generation device for rarefied gas dynamic test |
-
2020
- 2020-08-10 CN CN202021639665.4U patent/CN212254530U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111811767A (en) * | 2020-08-10 | 2020-10-23 | 中国空气动力研究与发展中心超高速空气动力研究所 | Free molecular flow generation device for rarefied gas dynamic test |
| CN111811767B (en) * | 2020-08-10 | 2024-06-04 | 中国空气动力研究与发展中心超高速空气动力研究所 | Free molecular flow generating device for lean gas dynamic test |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20201229 Effective date of abandoning: 20240604 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20201229 Effective date of abandoning: 20240604 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |