CN104405532A - Vacuum jet flow protective cover - Google Patents
Vacuum jet flow protective cover Download PDFInfo
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- CN104405532A CN104405532A CN201410588508.8A CN201410588508A CN104405532A CN 104405532 A CN104405532 A CN 104405532A CN 201410588508 A CN201410588508 A CN 201410588508A CN 104405532 A CN104405532 A CN 104405532A
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- safety cover
- taper
- protective cover
- jet flow
- straight tube
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Abstract
The invention provides a vacuum jet flow protective cover. The protective cover can restrain the on-track liquid drainage plume angle of a spacecraft to be less than 100 degrees. With circular arc transition, liquid jet flow can continuously enter a conical vacuum zone; turbulence and disturbance caused due to a clearance formed between the jet flow and a conical wall are avoided through a 45-degree conical angle; the flash evaporation length of 50 mm can ensure the sufficient flash evaporation of liquid, and the secondary flash evaporation of the liquid flowing out of the protective cover is avoided, and the vacuum jet flow plume angle is effectively restrained; meanwhile, the attachment of ice particles generated by flash evaporation is avoided through the smoothened inner surface and the sharpened opening of the protective cover, the profile of the protective cover is maintained complete, and the vacuum jet flow plume angle is effectively restrained.
Description
Technical field
The present invention relates to protective cover, particularly, relate to a kind of can the protective cover at operative constraint liquid vacuum jet plume angle.
Background technique
China astrovehicle discharge in orbit requires that liquid discharge stream plume angle is less than 100 °, to protect astrovehicle wall near floss hole and instrument.The measure that domestic and international constraint plume angle is commonly used has: change liquid initial temperature, change liquid discharge Flow Velocity and change caliber etc.Although these measures can improve to a certain extent stream plume angle, but for the icing phenomenon that the discharge middle and later periods mouth of pipe unavoidably occurs, these measures are helpless, because freeze to change the mouth of pipe and pipeline profile, cause flow path direction uncontrollable irregular, the requirement that China's astrovehicle is less than 100 ° cannot be met.
Summary of the invention
For defect of the prior art; the problem of China's astrovehicle discharge in orbit requirement cannot be met in order to solve existing constraint plume angle measure; the invention provides a kind of conical vacuum jet safety cover; this safety cover can guarantee that plume angle is all less than 100 ° of degree in the overall process of discharge, and does not have the expansion of plume angle and backflow phenomenon in safety cover outer rim.
According to a kind of vacuum jet safety cover provided by the invention, comprise taper safety cover, described taper safety cover is made up of straight tube, cone section, and straight tube is to the smooth arc transition of cone section, and taper safety cover internal surface is smooth, and the lip cutting of taper safety cover keeps sharp keen.
Preferably,
The semi-cone angle of taper safety cover is 45 degree;
Taper safety cover cone segment length is 50mm;
Straight tube is 1/3 of straight tube caliber to the interior chamfering diameter of cone section;
Straight tube is 2/3 of straight tube caliber to the outer chamfering diameter of cone section.
Preferably, taper safety cover inside surface roughness is 1.6.
Preferably, the lip outer rim tangent plane of taper safety cover and the axis being parallel of taper safety cover.
Compared with prior art, the present invention has following beneficial effect:
The present invention can provide the protection of safety conscientiously on the basis of additional a small amount of structure the outer surface near astrovehicle floss hole and instrument, ensures the ordinary life of astrovehicle.Pass through arc transition, liquid jet is made to enter conical vacuum district continuously, 45 ° of cone angles can be avoided occurring between jet and taper wall that gap forms turbulent perturbation, and the flash distillation length of 50mm can guarantee the abundant flash distillation of liquid, avoid secondary flash after liquid flows out safety cover, operative constraint vacuum jet plume angle; Meanwhile, the smooth treatment of safety cover internal surface and the sharp keen process of lip, can avoid the attachment of flash distillation ice pellets, keeps the profile that safety cover is complete, operative constraint vacuum jet plume angle.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is schematic diagram of the present invention.
In figure:
1--straight tube;
2-cone section;
3-lip.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
The present invention solves the scheme that astrovehicle discharge in orbit plume angle is less than 100 °: the 45 ° of taper safety covers adopting arc transition, safety cover internal surface is smooth, and lip is sharp keen.What arc transition can ensure liquid continuous gradation enters safety cover inner region; after the vacuum area entering safety cover inside; liquid is because of the violent flash of steam of contact vacuum environment; due to liquid be continuous gradation enter taper safety cover; when vaporizing liquid; turbulent flow gap is there will not be to go out to flow to upset jet between liquid and safety cover wall; simultaneously because 45 ° of cone angle spaces can meet the volumetric spaces needed for liquid vacuum phase transformation, when making liquid flow out safety cover, reexpansion larger plume cone angle can not be formed because phase transformation is insufficient.Safety cover internal surface smooth treatment and the sharp keen process of lip all can prevent ice pellets attachment during liquid vacuum flash distillation, keep the complete profile of safety cover, effectively retrain vacuum jet plume angle.
Particularly; in FIG; vacuum jet safety cover comprises taper safety cover; the semi-cone angle of taper safety cover is 45 degree, and straight tube is 1/3 of caliber to the interior chamfering diameter of cone section, and straight tube is 2/3 of caliber to the outer chamfering diameter of cone section; cone segment length is 50mm; safety cover inside surface roughness is 1.6, the axis being parallel of cone section lip outer rim tangent plane and vacuum jet safety cover, and lip outer rim keeps sharp keen.
About design parameter of the present invention, it should be noted:
(1) semi-cone angle of taper safety cover is 45 degree
The establishment of semi-cone angle of the present invention 45 degree is in analysis liquid vacuum jet characteristic; supersonic expansion stream is there is because of overheated; with the taper safety cover vertex of a cone for expansion point source radially flows out with axial expansion; because of the gas-liquid mixed stream supersonic speed after expansion; the impact of liquid initial speed and ignoring, thus, the resultant velocity of dilatant flow is and axially points to downstream in 45 degree; the angle of safety cover namely should with mixed flow in the same way, excessive or too small and non-tapered all can affect the protected effect of safety cover.
(2) taper safety cover cone segment length is 50mm
The longer protected effect of taper safety cover length is better in theory; based on the most effective principle; choose different length safety cover simulation calculation; when comparative analysis shows 50mm length; mixed flow expands fully; can not form secondary point source to expand, protected effect is best, and on From Math, verification experimental verification shows that 50mm length protected effect is best.
(3) taper safety cover inside surface roughness is 1.6
Jet because of violent phase transformation freeze time, the micro-protuberance of tube wall and micro-pits are temperature gradient biggest place, this place the most easily freezes, and the micro-protuberance of tube wall and micro-pits are the Microscopic of roughness, roughness higher then projection depression is less, more not-easy-to-freeze, and definitely hydraulically smooth surface is the most effective in theory, but consider applicable industry working ability, therefore provide higher roughness 1.6.
(4) straight tube is 1/3 of straight tube caliber to the interior chamfering diameter of cone section, and straight tube is 2/3 of straight tube caliber to the outer chamfering diameter of cone section
Outer chamfering is convenient processing under the condition of guarantee rigidity, and interior chamfering is that simulation calculation obtains the minimum chamfering of turbulent flow loss.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (4)
1. a vacuum jet safety cover, is characterized in that, comprises taper safety cover, and described taper safety cover is made up of straight tube, cone section, and straight tube is to the smooth arc transition of cone section, and taper safety cover internal surface is smooth, and the lip cutting of taper safety cover keeps sharp keen.
2. vacuum jet safety cover according to claim 1, is characterized in that,
The semi-cone angle of taper safety cover is 45 degree;
Taper safety cover cone segment length is 50mm;
Straight tube is 1/3 of straight tube caliber to the interior chamfering diameter of cone section;
Straight tube is 2/3 of straight tube caliber to the outer chamfering diameter of cone section.
3. vacuum jet safety cover according to claim 1, is characterized in that, taper safety cover inside surface roughness is 1.6.
4. vacuum jet safety cover according to claim 1, is characterized in that, the lip outer rim tangent plane of taper safety cover and the axis being parallel of taper safety cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410588508.8A CN104405532B (en) | 2014-10-28 | 2014-10-28 | Vacuum jet protective cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410588508.8A CN104405532B (en) | 2014-10-28 | 2014-10-28 | Vacuum jet protective cover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104405532A true CN104405532A (en) | 2015-03-11 |
| CN104405532B CN104405532B (en) | 2016-08-24 |
Family
ID=52643186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410588508.8A Active CN104405532B (en) | 2014-10-28 | 2014-10-28 | Vacuum jet protective cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104405532B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090205311A1 (en) * | 2006-11-10 | 2009-08-20 | Aerojet-General Corporation, A Corporation Of The State Of Ohio | Combined cycle missile engine system |
| CN101886972A (en) * | 2010-04-09 | 2010-11-17 | 中国科学院上海技术物理研究所 | System and method for testing influence of vacuum plume on infrared laser characteristics |
| CN102174914A (en) * | 2011-03-10 | 2011-09-07 | 西北工业大学 | Test device for studying distribution of plume condensed-phase particles of spray pipe |
| CN103675084A (en) * | 2013-11-27 | 2014-03-26 | 北京航空航天大学 | System and method for measuring plume multi-component space distribution in vacuum low-temperature environment |
-
2014
- 2014-10-28 CN CN201410588508.8A patent/CN104405532B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090205311A1 (en) * | 2006-11-10 | 2009-08-20 | Aerojet-General Corporation, A Corporation Of The State Of Ohio | Combined cycle missile engine system |
| CN101886972A (en) * | 2010-04-09 | 2010-11-17 | 中国科学院上海技术物理研究所 | System and method for testing influence of vacuum plume on infrared laser characteristics |
| CN102174914A (en) * | 2011-03-10 | 2011-09-07 | 西北工业大学 | Test device for studying distribution of plume condensed-phase particles of spray pipe |
| CN103675084A (en) * | 2013-11-27 | 2014-03-26 | 北京航空航天大学 | System and method for measuring plume multi-component space distribution in vacuum low-temperature environment |
Non-Patent Citations (1)
| Title |
|---|
| 杜军等: "《真空羽流污染的数值模拟》", 《北京航空航天大学学报》 * |
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| Publication number | Publication date |
|---|---|
| CN104405532B (en) | 2016-08-24 |
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