CN206771335U - For improving the liquid fuel injection device of jet penetration - Google Patents
For improving the liquid fuel injection device of jet penetration Download PDFInfo
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- CN206771335U CN206771335U CN201720213341.6U CN201720213341U CN206771335U CN 206771335 U CN206771335 U CN 206771335U CN 201720213341 U CN201720213341 U CN 201720213341U CN 206771335 U CN206771335 U CN 206771335U
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- air jetting
- jetting holes
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- spray orifice
- jet
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Abstract
The utility model provides a kind of liquid fuel injection device for being used to improve jet penetration, by filling gas jet in supersonic speed liquid transverse jet upstream, it can advance by gas jet with jet, so as to make jet go deep into main flow and realize effective blending.
Description
Technical field
Hypersonic flight technical field is the utility model is related to, is specifically related to a kind of for improving jet penetration
Liquid fuel injection device.
Background technology
Scramjet engine is as one of the ideal power device of hypersonic aircraft and key technology.In high ultrasound
Under fast flying condition, because scramjet engine combustion chamber dimensions are limited, the residence time is only millisecond magnitude to air-flow wherein,
Under the conditions of hypersonic flight, the residence time of scramjet engine burning indoor air flow is short, and liquid fuel is burning
The processes such as experience atomization, evaporation, mixing are needed before.Atomization is the starting stage of combustion process, and atomization process directly decides
Evaporation, mixing and burning efficiency.In order to improve the penetration depth of horizontal liquid jet, improve the spray mixed characteristic of fuel, prop up
The passive enhancing technology such as plate, pneumatic slope and effervescent atomization is put into substantial amounts of research.
Airflow passes support plate can produce recirculating zone and vortex structure behind support plate, vortex structure have to jet certain lifting and
Involving velocity；But support plate is put into flow field as the physical arrangement of a physical presence, it can greatly change flow field mechanism, increase
Add the resistance of incoming air, produce larger pitot loss.It is existing studies have found that flight Mach number 6, during flying height 24.5km
The nearly 1670K of support plate leading edge temperature, Mach number 8, support plate leading edge temperature is more than 2800K during height 30km, beyond current resistance to ablation
The limit of material, in order to ensure the implementation of the program, also need to provide thermal protection to branch harden structure.
The high pressure that pneumatic ramp structure is sprayed by upstream nozzle owes expanded gas flow and forms obstruction to incoming, produces arch and swashs
Ripple, and downstream produce flow to whirlpool on a large scale, compared with single hole direct projection, pneumatic slope have more preferable mixing effect and always
Pressure is recovered.Research to pneumatic slope at present is to be directed to gas jet, and the research to liquid jet is not carried out.
Effervescent atomization jet nozzle, penetration depth can be improved by improving hydraulic pneumatic amount flux ratio.Effervescent atomization jet phase
Denser spraying and smaller atomized drop can be obtained for neat liquid jet, while effervescent atomization jet penetration is bright
It is aobvious to be higher than neat liquid jet.But the process of effervescent atomizer is complicated compared with neat liquid jet nozzle.
Although the above method can largely improve jet penetration and atomizing effect, all exist not
With degree to sacrifice flow field stabilization, pitot loss, structure and reliability as cost, therefore, being badly in need of one kind can very big journey
Degree ground improves jet penetration, and and can changes flow field structure so as to obtain the flat board spray of higher total pressure recovery as few as possible
Scheme.
Utility model content
The purpose of this utility model is to provide a kind of liquid fuel injection device for being used to improve jet penetration, is somebody's turn to do
It is inadequate that utility model solves liquid fuel jet penetration depth in the prior art, it is impossible to is fully blended with main flow, wall
Neighbouring jet atomization effect is poor；Raising of the existing method to jet penetration, the excessive technology of change of convection current field structure are asked
Topic.
The utility model provides a kind of liquid fuel injection device for being used to improve jet penetration, including combustion chamber,
It is spaced apart to be provided with sidewall of combustion chamber and is used to jet be brought in main flow to and improved the air jetting holes of the two degree of mixing into and for shape
Into the liquid spray orifice of jet, air jetting holes are set close to main flow source, and one end of air jetting holes is connected with air accumulator by pipeline
Connect, the other end of air jetting holes is provided with the nozzle for gas injection；Liquid spray orifice is set away from main flow source, liquid spray orifice
One end be connected with the storage tank of liquid fuel by pipeline, the other end is provided with the nozzle for injecting LPG in liquefied condition, liquid
The aligning inner of one end and combustion chamber of the nozzle of spray orifice and the nozzle of air jetting holes；
The nozzle diameter of air jetting holes is more than the nozzle diameter of liquid spray orifice；
Air jetting holes are respectively vertical with main flow direction of flow with the axis of liquid spray orifice, the axis and liquid of air jetting holes
The vertical join line of the axis of spray orifice is parallel with the direction of flow of main flow.
Further, body spray orifice is a diameter ofWhereinRepresent liquid fuel mass flow, Δ p
Liquid injection pressure is represented, ρ represents liquid fuel density；Air jetting holes equivalent diameter dg=(2~4) dl, air jetting holes and liquid
The spacing of spray orifice is Δ l=(15~30) dl。
Further, the cross section of air jetting holes is circular, ellipse, rhombus or rectangle.
Technique effect of the present utility model：
The liquid fuel injection device provided by the utility model for being used to improve jet penetration, by supersonic speed liquid
Body transverse jet upstream fills gas jet, can advance by gas jet with jet, so as to go deep into jet
Main flow simultaneously realizes effective blending.
The liquid fuel injection device provided by the utility model for being used to improve jet penetration, with using the things such as support plate
The blending enhancement measures of reason structure are compared, and temperature barrier is set up without for support plate used.Reduce redundancy structure to jet
Interference.
Specific refer to proposes according to the liquid fuel injection device of the present utility model for being used to improve jet penetration
Various embodiments it is described below, will cause apparent in terms of above and other of the present utility model.
Brief description of the drawings
Fig. 1 is the side view that the utility model preferred embodiment is used to improve the liquid fuel injection device of jet penetration
Schematic cross-sectional view；
Fig. 2 is the vertical view that the utility model preferred embodiment is used to improve the liquid fuel injection device of jet penetration
Schematic cross-sectional view；
Fig. 3 is the gas that the utility model preferred embodiment is used to improve the liquid fuel injection device of jet penetration
Spray orifice and liquid spray orifice multiple combinations spray spatial distribution position view, a) it is wherein the first embodiment；B) it is second
Kind embodiment；C) it is the third embodiment；
Fig. 4 be in the utility model preferred embodiment liquid jet penetration depth curve with the change of gas jet injection pressure
Change situation schematic diagram；
Fig. 5 is that liquid jet penetration depth is bent with the change of gas jet injection pressure in the utility model preferred embodiment
Line schematic diagram；
Fig. 6 is change feelings of the liquid jet penetration depth before and after gas jet is added in the utility model preferred embodiment
Condition schematic diagram, a) it is wherein jet distribution situation during to provide device using the utility model；B) it is mutually to sympathize with a) figure
The utility model has been used to provide the jet distribution situation after device under condition.
Marginal data：
100th, air jetting holes；200th, liquid spray orifice.
Embodiment
The accompanying drawing for forming the part of the application is used for providing further understanding to of the present utility model, of the present utility model
Schematic description and description is used to explain the utility model, does not form to improper restriction of the present utility model.
Referring to Fig. 1~2, the liquid fuel injection device provided by the utility model for being used to improve jet penetration, bag
Combustion chamber is included, the air jetting holes for being provided with and being used for that jet to be brought into degree of mixing in main flow and both raising are spaced apart on sidewall of combustion chamber
100 and for forming the liquid spray orifice 200 of jet, air jetting holes 100 are set close to main flow source, one end of air jetting holes 100
It is connected with air accumulator by pipeline, the other end of air jetting holes 100 is provided with the nozzle for gas injection；Liquid spray orifice
200 are set away from main flow source, and one end of liquid spray orifice 200 is connected with the storage tank of liquid fuel by pipeline, and the other end is set
It is equipped with one end and combustion chamber of the nozzle for injecting LPG in liquefied condition, the nozzle of liquid spray orifice 200 and the nozzle of air jetting holes 100
Aligning inner；
The nozzle diameter of air jetting holes 100 is more than the nozzle diameter of liquid spray orifice 200；
Air jetting holes 100 are respectively vertical with main flow direction of flow with the axis of liquid spray orifice 200, air jetting holes 100
Axis is parallel with the vertical join line of the axis of liquid spray orifice 200 and the direction of flow of main flow.
Air-flow is increased by the upstream at fluidic vectoring thrust, jet can be effectively improved and enter the depth of main flow, and improved
The mixing uniformity of the two, so as to improve the spray mixed characteristic of fuel.Air jetting holes 100 and the liquid spray that this place opens up
Hole 200 can be configured by the requirement of jet generating device.
Gas can be supplied by gas tank, and pipeline is connected with nozzle using welding manner；Liquid fuel rushes with common super burn
Hydraulic motor liquid fuel supply system is the same.In order to reduce redundancy quality, gas also can from the air intake duct of engine or its
He is acquired part.
The set location of air jetting holes 100 and liquid spray orifice 200 can take various forms, referring to Fig. 3 a), air jetting holes
100 is arranged in parallel with liquid spray orifice 200, and gas-liquid spray orifice axis line is parallel with incoming.Referring to Fig. 3 b) it is horizontal along combustion chamber
To two air jetting holes 100 that be arranged in parallel, liquid is set to spray on the extended line at the midpoint of two axis lines of air jetting holes 100
Hole 200.The homalographic of air jetting holes 100 is divided into two combination bores, is distributed in the symmetrical position in the upstream of liquid spray orifice 200.Referring to
Fig. 3 c), air jetting holes 100 can be along the longitudinally displaced setting in combustion chamber with liquid spray orifice 200.On the basis of direction of flow, gas
The axis of spray orifice 100 and liquid spray orifice 200 is non-coplanar, the deviation of certain distance be present.
Preferably, liquid spray orifice 200 is a diameter ofWhereinLiquid fuel mass flow is represented,
Δ p represents liquid injection pressure, and ρ represents liquid fuel density；The equivalent diameter d of air jetting holes 100g=(2~4) dl, air jetting holes
100 and the spacing of liquid spray orifice 200 are Δ l=(15~30) dl.The gas ejected by this setting from air jetting holes 100 can
Effectively forming and hindered before liquid jet, and produce shock wave, Mach number reduces after making ripple, weakens interaction of gas and liquid after ripple,
Hydraulic pneumatic amount flux ratio when liquid jet sprays is lifted simultaneously.2~4 herein refer to that the equivalent diameter of air jetting holes 100 is
2~4 times of the diameter of liquid spray orifice 200.
Preferably, the cross section of the air jetting holes 100 is circular, ellipse, rhombus or rectangle.
Embodiment
Experiment is carried out on the cold examination atomization test platform of hypersonic Speed Ramjet Technique key lab of University of Science and Technology for National Defence
's.
Operating condition of test：Free stream Mach number 2.85, incoming stagnation pressure 1.32MPa, stagnation temperature 300K, the diameter of air jetting holes 100
2.0mm, the diameter 0.7mm of liquid spray orifice 200, gas-liquid spray orifice spacing 30mm, liquid injection pressure 2.0MPa, obtain liquid jet and wear
Saturating depth with gas with jet penetration change curve as shown in Figures 4 and 5.Fig. 4 abscissa origins represent liquid jet
Outlet, abscissa are that edge flows to distance, and ordinate is jet penetration.With triangle under square, rhombus, upper trigonometric sum in Fig. 4
Curve represent the liquid for extracting to obtain when gas jet injection pressure is respectively 0,0.98MPa, 1.99MPa and 3.05MPa respectively
Body jet coboundary.Jet penetration maximum under four kinds of operating modes is extracted and is plotted in Fig. 5, abscissa is gas in Fig. 5
Body injection pressure, ordinate jet penetration.As can see from Figure 5 in constant (the liquid injection pressure of liquid injection pressure
In the case of 2.0MPa), with the increase of gas injection pressure, jet penetration increase.
In the Fig. 6 obtained by Data Processing in Experiment a) and b) as can be seen that not increasing the situation of air jetting holes 100
Under, the diffusion depth of jet is smaller.And in b) figure by increasing air jetting holes 100 after, freedom of entry that jet can be deeper is come
In stream.In the case of adding air jetting holes 100, liquid jet penetration depth is obviously improved.
Those skilled in the art will be clear that the scope of the utility model is not restricted to example discussed above, it is possible to it
Some changes and modification are carried out, the scope of the utility model limited without departing from appended claims.Although oneself is through attached
The utility model is illustrated and described in detail in figure and specification, but such explanation and description are only explanations or schematical,
It is and nonrestrictive.The utility model is not limited to the disclosed embodiments.
By to accompanying drawing, the research of specification and claims, those skilled in the art when implementing the utility model
It is appreciated that and realize the deformation of the disclosed embodiments.In detail in the claims, term " comprising " be not excluded for other steps or
Element, and indefinite article "one" or " one kind " be not excluded for it is multiple.That quotes in mutually different dependent claims is some
The fact that measure, does not mean that the combination of these measures can not be advantageously used.Any reference marker in claims is not
Form the limitation to the scope of the utility model.
Claims (3)
- A kind of 1. liquid fuel injection device for being used to improve jet penetration, it is characterised in that including combustion chamber, the combustion Burn to be spaced apart to be provided with the side wall of room and be used to jet be brought in main flow to and improved the air jetting holes of the two degree of mixing into and for being formed The liquid spray orifice of the jet, the air jetting holes are set close to the main flow source, one end of the air jetting holes and gas storage Tank is connected by pipeline, and the other end of the air jetting holes is provided with the nozzle for gas injection；The liquid spray orifice is remote Set from the main flow source, one end of the liquid spray orifice is connected with the storage tank of the liquid fuel by pipeline, another End is provided with nozzle for spraying the liquid fuel, and the one of the nozzle of the liquid spray orifice and the nozzle of the air jetting holes The aligning inner at end and the combustion chamber；The nozzle diameter of the air jetting holes is more than the nozzle diameter of the liquid spray orifice；The air jetting holes are respectively vertical with the main flow direction of flow with the axis of the liquid spray orifice, the air jetting holes Axis it is parallel with the direction of flow of the main flow with the vertical join line of the axis of the liquid spray orifice.
- 2. the liquid fuel injection device according to claim 1 for being used to improve jet penetration, it is characterised in that institute State a diameter of of body spray orificeWhereinLiquid fuel mass flow is represented, Δ p represents liquid injection pressure Power, ρ represent liquid fuel density；The air jetting holes equivalent diameter dg=(2~4) dl, the spacing of air jetting holes and liquid spray orifice is Δ l=(15~30) dl。
- 3. the liquid fuel injection device according to claim 1 or 2 for being used to improve jet penetration, its feature exist In the cross section of the air jetting holes is circular, ellipse, rhombus or rectangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720213341.6U CN206771335U (en) | 2017-03-07 | 2017-03-07 | For improving the liquid fuel injection device of jet penetration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720213341.6U CN206771335U (en) | 2017-03-07 | 2017-03-07 | For improving the liquid fuel injection device of jet penetration |
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| Publication Number | Publication Date |
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| CN206771335U true CN206771335U (en) | 2017-12-19 |
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| CN201720213341.6U Active CN206771335U (en) | 2017-03-07 | 2017-03-07 | For improving the liquid fuel injection device of jet penetration |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106678791A (en) * | 2017-03-07 | 2017-05-17 | 中国人民解放军国防科学技术大学 | Liquid fuel injection device used for increasing jet flow penetration depth |
| CN111810316A (en) * | 2020-07-01 | 2020-10-23 | 中国空气动力研究与发展中心 | Fuel spray hole structure of scramjet engine |
-
2017
- 2017-03-07 CN CN201720213341.6U patent/CN206771335U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106678791A (en) * | 2017-03-07 | 2017-05-17 | 中国人民解放军国防科学技术大学 | Liquid fuel injection device used for increasing jet flow penetration depth |
| CN106678791B (en) * | 2017-03-07 | 2019-04-16 | 中国人民解放军国防科学技术大学 | For improving the liquid fuel injection device of jet penetration |
| CN111810316A (en) * | 2020-07-01 | 2020-10-23 | 中国空气动力研究与发展中心 | Fuel spray hole structure of scramjet engine |
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