CN105588145A - Micro-engine combustion chamber spiral evaporating pipe with fins arranged inside - Google Patents
Micro-engine combustion chamber spiral evaporating pipe with fins arranged inside Download PDFInfo
- Publication number
- CN105588145A CN105588145A CN201610045519.0A CN201610045519A CN105588145A CN 105588145 A CN105588145 A CN 105588145A CN 201610045519 A CN201610045519 A CN 201610045519A CN 105588145 A CN105588145 A CN 105588145A
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- Prior art keywords
- evaporation tube
- evaporating pipe
- oil
- diameter
- spiral
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
- F23R3/30—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising fuel prevapourising devices
- F23R3/32—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising fuel prevapourising devices being tubular
Abstract
The invention provides a micro-engine combustion chamber spiral evaporating pipe with fins arranged inside. The micro-engine combustion chamber spiral evaporating pipe is internally provided with a plurality of fin structures and is in a spiral shape. The fin structures are arranged in two forms, namely a circular hole type and an 8-shaped hole type. Due to the fin structures added inside the evaporating pipe, the superficial area of the inner wall face can be greatly increased, the contact area of oil-mixing gas and the evaporating pipe is increased and the heat exchange effect is enhanced. In addition, the fin structures can decrease the flow speed of the oil-mixing gas to a certain degree, so that the effect that stay time of the oil-mixing gas in the evaporating pipe is prolonged is achieved and the heat exchange effect is enhanced. The circular hole type fins has a large effect on gas flow speed decrease, and stay time of gas flow in the evaporating pipe is greatly prolonged. The 8-shaped hole type fins are capable of largely increasing the area of the inner wall face of the evaporating pipe. Accordingly, both the two types of fins have corresponding advantages. The two types of fins can be combined and simultaneously arranged inside the same evaporating pipe so as to achieve the optimal atomization-vaporization effect. By means of the spiral shape, the stay time of the oil-mixing gas in the evaporating pipe is prolonged and the heat exchange area of the oil-mixing gas in the evaporating pipe is increased, so that the oil atomization-vaporization is facilitated. The good oil atomization-vaporization effect can improve the combustion performance.
Description
Technical field
The invention belongs to field, tiny engine combustion chamber, be specifically related to a kind of novel evaporation tube design and can effectively improveFuel-oil atmozation evaporation effect in combustion chamber, thus the efficiency of combustion in miniature combustion chamber improved.
Background technology
Micro power systems had become domestic and international study hotspot in recent years, and wherein micro turbine engine is the most promisingOne of power, have that volume is little, lightweight, output energy is large, density advantages of higher. The design of miniature combustion chamberBeing key link in micro turbine engine, is also most important part, compared with conventional yardstick combustion chamber, and this kind of combustionBurn chamber and there is the little and large feature of surface to volume ratio of characteristic size, cause that the air-flow time of staying is short, radiation loss is large, thereby leadCause the appearance of combustion instability phenomenon.
Though carried out the correlative study work of miniature combustion chamber both at home and abroad, for flow performance and the property of miniature combustion chamberThe research of energy is less, for the tiny engine combustion chamber of (thrust is less than 50daN), mainly contains two kinds: direct current ringShape combustion chamber and backflow toroidal combustion chamber, high-performance micro engine adopts direct current annular firing more, due to cost and skyBetween restriction, aspect fuel-oil atmozation, evaporation, substantially adopt evaporation tubular type fuel feeding simple in structure, adopt this kind of modeFuel system can obtain higher combustibility under shorter burning time of staying condition. And wherein evaporate tubular typeToroidal combustion chamber has that atomization is good, efficiency of combustion is high, charge oil pressure is low, cost is low and is lightweight etc. many-sided excellentPoint. In this kind of combustion chamber, the structural design of evaporation tube plays key effect to atomization in combustion chamber, efficiency of combustion.
Kind of design for evaporation tube structure aspects mainly contains " L " type and straight barrel type, and wall major part still adoptsHydraulically smooth surface structure, fuel oil is short in the time of staying of this type of evaporation tube, few with the contact area of wall, the atomization obtainingEvaporation effect is poor, make the atomization of evaporation tube and evaporation effect better, and the design of internal structure plays key effect.It is whether good that evaporation tube designs, and miniature chamber performance is had a significant impact, and has in this respect very large Research Prospects.
Summary of the invention
Technical problem to be solved by this invention is to propose one can strengthen fuel oil evaporation fog effect in miniature combustion chamberEvaporation tube structural design scheme. This technology employing built-in fin of evaporation tube and profile are spiral, advantage: increase fuel oilAt evaporation intraductal retention time, increase internal face surface area, increase the heat exchange of wall and mixed gas.
Technical scheme
The object of the present invention is to provide the spiral evaporation tube of the built-in fin in a kind of tiny engine combustion chamber.
Technical solution of the present invention is as follows:
The spiral evaporation tube of the built-in fin in tiny engine combustion chamber, built-in multiple fins. For the evaporation tube of Centimeter Level,Wall thickness is 1～2mm, and diameter is 5～10mm, and length is 4～10cm.
The built-in fin of described evaporation tube, is characterized in that: in evaporation tube, by axial direction, multiple rib structures are set.Rib structure is divided into circular hole and " 8 " word pass.
Described circular hole rib structure, is characterized in that: branch center great circle and periphery roundlet structure. Center axis of great circleThe half that is of a size of evaporation tube diameter is 2.5mm～5mm; Periphery roundlet, diameter dimension is set between 0.5～2mm,Distribute around central circular, distributed quantity is 15-40, and concrete Circularhole diameter and quantity should be according to the diameters of evaporation tubeDesign.
Described " 8 " word pass rib structure, is characterized in that: branch center great circle and periphery roundlet structure. Center great circleDiameter dimension is that the half of evaporation tube diameter is 2.5mm～5mm; " 8 " word pass of periphery divides upper and lower two circles, twoIndividual circular diameter design can adopt equal diameter design, and diameter dimension is 1-2mm, distribute around central circular, and distributed quantityFor 10-20, concrete size and quantity are according to the actual size design of evaporation tube.
Described spiral profile, is characterized in that: pitch is 30～60mm, and screw diameter is 30～50mm, spiralThe number of turns is 1～3, and concrete helix parameter designs according to actual evaporation pipe size.
Described rib structure is characterized as in axial directional distribution: carry out linear distribution along evaporation tube axial direction, and spiralProfile is longer compared to straight pipe type, can adopt the fin of a greater number, and quantity is 10-50, concrete quantity basisEvaporation tube length is determined. Meanwhile, the rib structure that diverse location adopts can be different, and two kinds of evaporation tubes combinations are madeWith, can reach more excellent atomization and vaporization effect.
The present invention has following beneficial effect:
In tiny engine combustion chamber, adopt rib-type evaporation tube, different from common evaporation tube, in evaporation tube, increase ribChip architecture and adopt spiral profile, increased the time that air-flow stops in evaporation tube, allow its have the sufficient time withEvaporation inner air tube evaporates premix, and meanwhile, rib structure has increased internal face area, increases combustion gas and evaporation tubeThe contact area of wall, heat exchange strengthens, and the atomization and vaporization of fuel oil is had to stiffening effect, has the evaporation tube of fin, energyEnough atomization and vaporization effects that better improves the fuel oil of the evaporation tube of flowing through, good fuel-oil atmozation, to chamber performanceRaising has very great help.
Brief description of the drawings
Fig. 1: the spiral evaporation tube entirety of built-in fin graphics
Fig. 2: the spiral evaporation tube import of built-in fin partial enlarged drawing
Fig. 3: (1) is single circular hole fin schematic diagram, (2) " 8 " word pass schematic diagram
Fig. 4: the spiral evaporation tube import of built-in fin axial section schematic diagram
Detailed description of the invention
Now the invention will be further described by reference to the accompanying drawings:
In conjunction with Fig. 1, Fig. 3, Fig. 4, the invention provides a kind of new can effectively strengthening heat exchange and improve EVAPThe spiral evaporation tube of the built-in fin in tiny engine combustion chamber of atomization. Fig. 3 is that the single rib structure of evaporation tube cross section showsIntention, Fig. 4 is generalized section in axial direction.
Detailed process: extraneous air-flow through the import of rib-type evaporation tube and along with spray fuel oil jointly enter in evaporation tube,Evaporation tube has rib structure (Fig. 3), and fuel oil and gas mix common impact tube inner rib plate, increase both blending,Can make the speed of air-flow and fuel oil slow down, both were increased in the time of staying of evaporation tube simultaneously, and, rib structureIncrease, make evaporation tube internal face area change, thereby make the contact area increase of mixed gas and evaporation tube wall, air-flowStrengthened with the heat exchange of evaporation tube wall. The fin of different structure shown in Fig. 3, to the effect difference of fuel-oil atmozation,Adopt circular hole fin, the mixed gas time of staying of fuel oil is longer, adopts " 8 " font hole fin, the mixed gas of fuel oil and wallContact area is larger, and both all can obtain good effect to fuel-oil atmozation evaporation. Be straight barrel type compared to profile in the pastEvaporation tube, the present invention adopts profile spiral, in limited length space, expands evaporation tube space and inside and outside wallFace surface area, fuel oil this evaporation tube of flowing through, the time of stop increases, and is strengthened with the heat exchange of wall. Fuel oil is upperState under these effects, obtain good atomization and vaporization.
The mixed gas of premix enters burner inner liner inside through evaporation tube outlet, owing to having mixed filling very much of evaporation in evaporation tubePoint, can burn better more fully in evaporation tube outlet, thereby reach raising efficiency of combustion, also to chamber performanceImprove a lot, engine performance also can further improve.
Claims (5)
1. the spiral evaporation tube of the built-in fin in tiny engine combustion chamber, evaporation tube inside arranges multiple rib structures, its spyProperty is: circular hole fin and " 8 " font fin, profile adopts spiral.
2. circular hole rib structure according to claim 1, is characterized in that: branch center great circle and periphery roundlet structure.The half that center axis of great circle is of a size of evaporation tube diameter is 2.5mm～5mm; Periphery roundlet, diameter dimension settingBe between 0.5～2mm, distribute around central circular, distributed quantity is 15-40, concrete Circularhole diameter and numberAmount should be according to the diameter design of evaporation tube.
3. " 8 " word pass rib structure according to claim 1, is characterized in that: branch center great circle and periphery roundletStructure. The half that center axis of great circle is of a size of evaporation tube diameter is 2.5mm～5mm; " 8 " word hole of peripheryType divides upper and lower two circles, and two circular diameter designs can adopt equal diameter design, and diameter dimension is 1-2mm, aroundCentral circular distributes, and distributed quantity is 10-20, and concrete size and quantity are established according to the actual size of evaporation tubeMeter.
4. according to rib-type evaporation tube described in claims 1 to 3, axial direction is characterised in that: along evaporation tube axial directionCarry out linear distribution, quantity is 10-50, and concrete quantity is determined according to evaporation tube length.
5. the spiral evaporation tube of the built-in fin in tiny engine according to claim 1 combustion chamber, spiral profile,It is characterized in that: pitch is 30～60mm, screw diameter is 30～50mm, and the spiral number of turns is 1～3, concreteHelical shape parameter design according to actual evaporation pipe size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610045519.0A CN105588145A (en) | 2016-01-25 | 2016-01-25 | Micro-engine combustion chamber spiral evaporating pipe with fins arranged inside |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610045519.0A CN105588145A (en) | 2016-01-25 | 2016-01-25 | Micro-engine combustion chamber spiral evaporating pipe with fins arranged inside |
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| CN105588145A true CN105588145A (en) | 2016-05-18 |
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| CN201610045519.0A Pending CN105588145A (en) | 2016-01-25 | 2016-01-25 | Micro-engine combustion chamber spiral evaporating pipe with fins arranged inside |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106678874A (en) * | 2016-11-18 | 2017-05-17 | 西北工业大学 | Micro engine combustor annular concave-convex wall face spiral type evaporating pipe |
| CN106678872A (en) * | 2016-11-18 | 2017-05-17 | 西北工业大学 | Mini-type engine combustion chamber cavity wall face spiral evaporation pipe |
| CN106918055A (en) * | 2017-03-02 | 2017-07-04 | 蔡肃民 | A kind of Micro Turbine Jet Engine fuel oil choked flow atomizer |
| CN109340822A (en) * | 2018-10-08 | 2019-02-15 | 西北工业大学 | The spiral evaporation tube of discount vibram outlet shape baffle plate built in tiny engine combustion chamber |
| CN111520754A (en) * | 2020-03-17 | 2020-08-11 | 西北工业大学 | Novel miniature aeroengine combustion chamber |
| CN112948970A (en) * | 2021-03-01 | 2021-06-11 | 西北工业大学 | Design method of spiral evaporation tube structure based on spherical convex fins |
| CN114608031A (en) * | 2022-03-09 | 2022-06-10 | 西北工业大学 | Novel spiral evaporating pipe |
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| CN201025157Y (en) * | 2007-02-12 | 2008-02-20 | 深圳市康铖机械设备有限公司 | Micro turbine jet engine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106678874A (en) * | 2016-11-18 | 2017-05-17 | 西北工业大学 | Micro engine combustor annular concave-convex wall face spiral type evaporating pipe |
| CN106678872A (en) * | 2016-11-18 | 2017-05-17 | 西北工业大学 | Mini-type engine combustion chamber cavity wall face spiral evaporation pipe |
| CN106918055A (en) * | 2017-03-02 | 2017-07-04 | 蔡肃民 | A kind of Micro Turbine Jet Engine fuel oil choked flow atomizer |
| CN109340822A (en) * | 2018-10-08 | 2019-02-15 | 西北工业大学 | The spiral evaporation tube of discount vibram outlet shape baffle plate built in tiny engine combustion chamber |
| CN111520754A (en) * | 2020-03-17 | 2020-08-11 | 西北工业大学 | Novel miniature aeroengine combustion chamber |
| CN112948970A (en) * | 2021-03-01 | 2021-06-11 | 西北工业大学 | Design method of spiral evaporation tube structure based on spherical convex fins |
| CN114608031A (en) * | 2022-03-09 | 2022-06-10 | 西北工业大学 | Novel spiral evaporating pipe |
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Application publication date: 20160518 |