CN101718626B - Heat sink wall panel structure arrangement for increasing absorption of plume gas - Google Patents
Heat sink wall panel structure arrangement for increasing absorption of plume gas Download PDFInfo
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- CN101718626B CN101718626B CN2009102372012A CN200910237201A CN101718626B CN 101718626 B CN101718626 B CN 101718626B CN 2009102372012 A CN2009102372012 A CN 2009102372012A CN 200910237201 A CN200910237201 A CN 200910237201A CN 101718626 B CN101718626 B CN 101718626B
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- heat sink
- liquid nitrogen
- plume
- nitrogen heat
- gas
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Abstract
The invention relates to a heat sink wall panel for plume test, mainly consisting of a liquid nitrogen heat sink fin (1), a liquid nitrogen heat sink branch pipe (2), a liquid nitrogen heat sink branch pipe (3) and a liquid nitrogen heat sink fin (4). The liquid nitrogen heat sink is located inside the liquid nitrogen heat sink to reduce the heat load of a vacuum container to the liquid nitrogen heat sink; the liquid nitrogen heat sink directly faces to the gas in plume test ensuring high pumping speed and high plume absorption efficiency; the opening direction of the liquid nitrogen heat sink wall panel is opposite to the direction of the plume, and the plume gas can rapidly enter into the liquid nitrogen heat sink and the liquid nitrogen heat sink interlayer to reduce the plume ejection sped and improve the absorption efficiency via multiple bounce; the opening direction of the liquid nitrogen heat sink wall panel is in the plume direction and is in geometric symmetry with the opening direction of the liquid nitrogen heat sink wall panel so that the plume gas is easy to enter and difficult to come out, the capturing rate of gas is increased; gap is left between the fins so that both sides of the heat sink can absorb flume gas, thereby effectively increasing the plume absorption area; and the materials adopt stainless steel branch pipes and copper fins, thereby effectively improving the static and dynamic vacuum degree inside the vacuum container.
Description
[technical field]
The present invention relates to be used to increase the heat sink wall panel structure of plume gas absorption.The present invention is applied to increase the cylindrical section heat sink wall panel structure of plume gas absorption especially.
[background technology]
A large amount of rail control engines that use on artificial satellite, airship, space station, deep space probe, guided missile and the carrier rocket, its jet flow can form the vacuum plume to external environment condition free expansion when working under the thin environment in high-altitude.Plume can produce plume influences such as plume contamination, plume perturbed force and plume thermal effect to spacecraft.These influences gently then reduce the performance of operation element, and are heavy then cause the failure of aerial mission.Along with developing rapidly of aerospace industry, the plume problem that space flight design department produces when more and more paying close attention to rail control engine operation on the spacecraft.
An important prerequisite of plume effect problem research is the quick absorption that guarantees the plume experimental gas, makes environment vacuum tightness to reach the set quota.The nitrogen simulation is mostly adopted in plume experiment in high-altitude, and the equipment that is used to adsorb the plume experimental gas mainly is the cryogenic pump around the vacuum tank inside surface, i.e. helium plate (liquid helium is heat sink).
The nineties in 20th century, in the hydrazine engine thrust experiment that the U.S. carries out in high-vacuum apparatus the Ge Dade space research center, adopting has the helium plate (secondary cryopump) that liquid nitrogen blocks the screening glass cooling that principal ingredient is comprised N
2, H
2Combustion gas carry out condensation and bleed.The area of bleeding of helium plate is 57m
2, when the mass rate 0.0445g/s of combustion gas, realized dynamic duty vacuum height 128km (1.33 * 10-3Pa) plume effect test research.
Late 1990s, German DLR has built STG vacuum plume experimental system.This system is different with the equipment of Ge Dade space research center, and the helium intralamellar part does not have the liquid nitrogen barricade, and plume gas directly acts on helium plate surface.The cryopump helium plate area of STG is 30m
2, can guarantee 0.5N (the respective quality flow is 0.2g/s) trust engine running hours, keep pressure less than 10
-3Pa.
According to the layout structure of this cryopump, realize that (dynamic vacuum degree is less than 10 for high-altitude than high thrust motor
-3Pa) research work will increase the area of helium plate and the capture rate of gas molecule accordingly.In fact, according to the kind and the temperature thereof of gas, the area of helium plate and the capture rate of gas molecule have very big difference.The capture rate that how as far as possible to strengthen adsorption area and gas molecule in effective space becomes high-altitude plume Experimental design key.
The basic process of plume experiment is, jet flow gas sprays with supersonic speed in the experimentation, and diffusion rapidly in vacuum tank is in order to keep high dynamic vacuum degree, need adsorb (speed reduces to zero) to the gas moment condensation of ejection, thus space environment that is virtually reality like reality.
[summary of the invention]
The objective of the invention is to improve the capture rate of gas molecule, to keep high dynamic vacuum degree by rational heat sink structure layout.
The heat sink wall panel that is used for plume testing mainly is made up of liquid nitrogen heat sink fin (1), liquid nitrogen heat sink arm (2), the heat sink arm of liquid helium (3), the heat sink fin of liquid helium (4), wallboard commonly used is to be welded by copper fin and stainless steel arm, wherein logical liquid nitrogen or liquid helium refrigerant in the stainless steel arm.
The advantage that the present invention has is: (a) the heat sink liquid nitrogen heat sink inside that is positioned at of liquid helium has reduced vacuum tank to the heat sink thermal load of liquid helium; (b) liquid helium is heat sink directly in the face of plume testing gas, and pumping speed is big, plume adsorption efficiency height; (c) liquid helium heat sink wall panel opening direction comes flow path direction against plume, and plume gas can enter in the heat sink and liquid nitrogen heat sink interlayer of liquid helium fast, reduces the plume jet speed by bounce-back repeatedly, improves adsorption efficiency; (d) liquid nitrogen heat sink wallboard opening direction comes flow path direction along plume, becomes symmetry how much with liquid helium heat sink wall panel opening direction, and plume gas is easily advanced, and is difficult for, and has increased the capture rate of gas; (e) leave the space between fin and the fin, make heat sink tow sides can adsorb plume gas, effectively increased the plume adsorption area; (f) material adopts stainless steel arm and copper fin; (g) quiet, the dynamic vacuum degree of vacuum tank inside have effectively been improved.
[description of drawings]
Fig. 1 is the plume heat sink wall panel structure
Fig. 2 is a vacuum tank inner cylinder section heat sink wall panel structure schematic layout pattern
[embodiment]
Further specify the present invention below in conjunction with accompanying drawing.
The heat sink wall panel that is used for plume testing shown in Figure 1 mainly is made up of liquid nitrogen heat sink fin (1), liquid nitrogen heat sink arm (2), the heat sink arm of liquid helium (3), the heat sink fin of liquid helium (4), wallboard commonly used is to be welded by copper fin and stainless steel arm, wherein logical liquid nitrogen or liquid helium refrigerant in the stainless steel arm.
Liquid nitrogen heat sink stainless-steel tube spacing 400mm, stainless-steel tube size Φ 20 * 2; Liquid helium is heat sink stainless-steel tube spacing 200mm, stainless-steel tube size Φ 20 * 2.This heat sink wall panel size form can guarantee the homogeneity of heat sink temperature, satisfies the experiment demand.
With formula the influence to heat sink pumping speed of heat sink adsorption area and gas molecule trapping rate is described below.
The static desirable Calculation of Pumping formula that liquid helium is heat sink is as follows:
S
0=3.64 * 10
4A
Helium(T
g/ M)
1/2
In the formula:
S
0---the desirable pumping speed of helium cyropump, L/s;
A
Helium---the area of helium plate, m2;
T
g---the temperature of gas, T is got at vacuum plume effect experiment system place
g=300K;
The relative molecular weight of M---gas, g/mol.
In the practical work process, the gas molecule absorption that on a certain cryosurface, can not be condensed fully, the portion of energy king-sized molecule of collision on heat sink surface can reflect back (because speed is too fast, supersonic flow).Actual pumping speed is littler than theoretical pumping speed.
The actual Calculation of Pumping formula that liquid helium is heat sink is as follows:
S=C S
0=3.64 * 10
4CA
Helium(T
g/ M)
1/2
In the formula:
The actual pumping speed of S---helium cyropump, L/s;
The capture rate of C---gas molecule (condensation coefficient);
S
0---the desirable pumping speed of helium cyropump, L/s;
A
Helium---the area of helium plate, m
2
The temperature of Tg---gas, Tg=300K is got at vacuum plume effect experiment system place;
The relative molecular weight of M---gas, g/mol.
Table 1 gas is 300K, to the ε/K value on the deep cooling surface of 20K
| Gas | N 2 | Ar | CO 2 | N 2O | O 2 | 90％N 2，10％O 2 | 80％N 2，20％O 2 | CO |
| ε/K | 290 | 293 | 289 | 288 | 532 | 361 | 416 | 532 |
The condensation coefficient of the gas of table 2 300K under various condensing surface temperature
From above formula and chart as can be seen: heat sink adsorption area is big more, and pumping speed is big more; The capture rate of gas molecule depends on kind, speed, heat sink temperature and the wall panel structure of gas, and the heat sink wall panel structure of the present invention's design is according to the singularity design of plume testing gas.
Claims (1)
1. increase the cylindrical section heat sink wall panel structure of plume gas absorption, it is characterized in that, form by liquid nitrogen heat sink fin (1), liquid nitrogen heat sink arm (2), the heat sink arm of liquid helium (3), the heat sink fin of liquid helium (4); Liquid helium is heat sink to be positioned at liquid nitrogen heat sink inside, and liquid helium is heat sink directly in the face of plume testing gas, and liquid helium heat sink wall panel opening direction comes flow path direction against plume, and liquid nitrogen heat sink wallboard opening direction comes flow path direction along plume;
Leave the space between the fin of described liquid nitrogen heat sink and the fin, leave the space between fin that liquid helium is heat sink and the fin, make the heat sink tow sides of liquid nitrogen heat sink and liquid helium can adsorb plume gas; Liquid nitrogen heat sink arm (2) and the heat sink arm of liquid helium (3) adopt the stainless steel arm, and liquid nitrogen heat sink fin (1) and the heat sink fin of liquid helium (4) adopt copper fin; Stainless steel arm and copper fin adopt and are welded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102372012A CN101718626B (en) | 2009-11-10 | 2009-11-10 | Heat sink wall panel structure arrangement for increasing absorption of plume gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102372012A CN101718626B (en) | 2009-11-10 | 2009-11-10 | Heat sink wall panel structure arrangement for increasing absorption of plume gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101718626A CN101718626A (en) | 2010-06-02 |
| CN101718626B true CN101718626B (en) | 2011-11-16 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101947474B (en) * | 2010-07-21 | 2012-03-21 | 北京航空航天大学 | Fractional liquid supply temperature self compensation liquid helium heat sink structure |
| CN102175457B (en) * | 2011-01-28 | 2012-07-04 | 北京航空航天大学 | Flat-shaped liquid-nitrogen and liquid-helium dual-media compatible heat sink device and cooling method thereof |
| CN106275524A (en) * | 2016-08-08 | 2017-01-04 | 北京航天试验技术研究所 | The low temperature of a kind of big adsorption area is heat sink |
| CN107340139B (en) * | 2017-06-21 | 2020-06-02 | 北京卫星环境工程研究所 | Sputtering target device for system-level ignition test of electric propulsion spacecraft |
| CN108020434B (en) * | 2018-01-12 | 2019-03-08 | 北京航空航天大学 | Bottom end splashproof is shot at the target |
| CN108240910B (en) * | 2018-01-12 | 2019-03-08 | 北京航空航天大学 | Band cylinder bilayer Anti-splash molsink and its cooling means |
| CN108051235B (en) * | 2018-01-12 | 2019-03-08 | 北京航空航天大学 | The double-deck Anti-splash molecule sink structure and its cooling means of ground electric propulsion test |
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Inventor after: Cai Guobiao Inventor after: Ling Guilong Inventor after: Wang Wenlong Inventor after: Li Xiaojuan Inventor after: Huang Bencheng Inventor after: Zhang Guozhou Inventor before: Ling Guilong Inventor before: Cai Guobiao Inventor before: Wang Wenlong Inventor before: Li Xiaojuan Inventor before: Huang Bencheng Inventor before: Zhang Guozhou |
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Free format text: CORRECT: INVENTOR; FROM: LING GUILONG CAI GUOBIAO WANG WENLONG LI XIAOJUAN HUANG BENCHENG ZHANG GUOZHOU TO: CAI GUOBIAO LING GUILONG WANG WENLONG LI XIAOJUAN HUANG BENCHENG ZHANG GUOZHOU |
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