CN109808902A - A kind of method for arranging of aircraft fuel oil diffuser and pressure-regulating device - Google Patents
A kind of method for arranging of aircraft fuel oil diffuser and pressure-regulating device Download PDFInfo
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- CN109808902A CN109808902A CN201811612124.XA CN201811612124A CN109808902A CN 109808902 A CN109808902 A CN 109808902A CN 201811612124 A CN201811612124 A CN 201811612124A CN 109808902 A CN109808902 A CN 109808902A
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- pressure
- fuel oil
- diffuser
- baffle plate
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Abstract
The present invention relates to a kind of aircraft fuel oil diffuser and the method for arranging of pressure-regulating device, propose a kind of fuel oil diffuser with pressure-regulating device, and pressure-regulating device is several baffle plates for being vertically mounted on fuel oil diffuser inner surface.The fuel pressure of the adjustable diffuser inside of these baffle plates eliminates " building the pressure " phenomenon, so that the pressure distribution at mesh tends to be uniform.The invention also provides the method for arranging of the pressure-regulating device, i.e., the installation of baffle plate is carried out based on the fuel oil diffuser inside pressure characteristic distributions for not installing pressure-regulating device.The invention reside in the principles using theory analysis and numerical simulation, by in several baffle plates of fuel oil diffuser inside right angle setting, so that the fuel pressure distribution in diffuser at mesh tends to be uniform, it reduces fuel oil spouting velocity and improves its uniformity, and then reduce the probability that electrostatic occurs in pressure filling for aircraft.
Description
Technical field
The present invention relates to aircraft refuelling fields, more particularly, to the fuel oil diffuser field of Airplane Pressure Fueling System.
Background technique
Aircraft fuel oil is generally aviation kerosine, and static characteristic is that fuel flow rate is bigger, electrostatic pressure is bigger namely fuel oil from
The risk of combustion is also bigger.Aircraft fuel oil enters fuel tank from bottom, needs to meet " 25.1301 (a) in " airplane in transportation category airworthiness standard "
The requirement of function and installation ".Fuel oil diffuser belongs to the end equipment in a kind of fuel pressure filling conduit system, and function is
Fuel oil speed is reduced, reduces the electrostatic pressure of fuel oil, and then guarantee the safety of pressure filling process.Due to the straight peace of fuel oil diffuser
It mounted in bottom of aircraft fuel tanks, therefore is only capable of half side wall on it and carries out aperture, as illustrated in fig. 1 and 2.
Since the root of such fuel oil diffuser blocks, the fuel pressure that this will lead to its root is excessively high, occurs " building the pressure "
Phenomenon, as shown in Figure 3.By aperture flow behavior it is found that the speed that fuel oil is sprayed from mesh is determined by diffuser inside and outside differential pressure.Cause
This, the speed that fuel oil is sprayed from diffuser wall mesh is directly affected by the pressure of diffuser inside, especially at mesh
Fuel oil diffuser inside pressure distribution." building the pressure " phenomenon will lead to fuel oil from the mesh spouting velocity mistake close to diffuser root
Greatly, the safety requirements of aircraft pressure filling is not met.
For the internal flow of pipeline, by Bernoulli equation it is found that change its internal pressure distribution means need
Change the velocity flow profile of pipeline.In addition, by the continuity equation of fluid it is found that the velocity flow profile of change pipeline, can pass through
It is realized by the sectional area for changing pipeline.It can be seen that the velocity flow profile feature of change pipeline, Lai Shixian pipeline can be passed through
The adjusting of internal pressure, this will be eliminated " building the pressure " phenomenon, reduce fuel oil spouting velocity and improve the key breakthrough of its uniformity
Mouthful.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of aircraft fuel oil diffuser with pressure-regulating device and
A kind of method for arranging of pressure-regulating device, it is therefore intended that " the building the pressure " for eliminating diffuser inside by pressure-regulating device is existing
As improving the fuel pressure distribution consistency degree in diffuser at mesh, and then realize fuel oil from diffuser wall mesh
It uniformly sprays, and realizes that spouting velocity size meets associated specifications.
The present invention provides a kind of aircraft fuel oil diffuser with pressure-regulating device, including one section of closed circle in root are cut
Facial canal road.The root of the pipeline is closed, and half side wall offers netted aperture, if other half side wall for not opening up mesh is equipped with
Dry baffle plate, entrance control valve outlet with aircraft refuelling by one section of connecting tube and are connected；Entrance stream of the fuel oil from the pipeline
Enter, and through being sprayed at side wall mesh, into fuel tanker.The pipeline is straight to be mounted on bottom of aircraft fuel tanks, described netted small
Hole is uniformly provided with half side wall backwards to bottom of aircraft fuel tanks；It is straight at the top of the baffle plate, and be vertically installed tightly to close
Half side wall of bottom of aircraft fuel tanks.
The baffle plate of the fuel oil diffuser, it is characterised in that: the height of the baffle plate is no more than diffuser inside diameterD's
1/4, number is at least 3.Wherein, the height of first baffle plate is 0.125D, the length apart from diffusor entry is 0.1L；
The height of remaining baffle plate is 0.25D, two necessary baffle plates are arranged in apart from diffusor entry 0.3LWith 0.5L
Place.
The present invention also provides a kind of method for arranging of fuel oil diffuser pressure-regulating device, it is characterised in that: chooses
0.125DWith 0.25DSeveral baffle plates of height carry out pressure adjusting, and baffle plate is closely vertically mounted on close to fuel tanker bottom
The fuel oil diffuser inner sidewall in portion.The position of baffle plate and number, not install the pressure of the fuel oil diffuser inside of baffle plate
Characteristic distributions are reference frame.Method for arranging specifically: 1) obtained not using experiment measurement or computational fluid dynamics simulation means
The pressure distribution of the fuel oil diffuser inside of baffle plate is installed；2) expansion for needing to adjust pressure is determined according to the pressure characteristic distributions
Dissipate device range；3) several baffle plates of close installation in the range, and then adjust the pressure within the scope of this.
A kind of aircraft fuel oil diffuser and pressure-regulating device method for arranging disclosed by the invention are compared with the existing technology
Beneficial effect is:
Aircraft fuel oil diffuser disclosed in this invention, inner sidewall vertical close installation baffle plate, and provide it is a kind of such as
The method what arranges baffle plate.Baffle plate can significantly improve " building the pressure " phenomenon of diffuser root, so that leaning in diffuser
Fuel pressure distribution at nearly mesh tends to uniformly, reduce fuel oil spouting velocity and improve its uniformity, and then reduces aircraft and exist
The probability of electrostatic occurs when pressure filling.
Detailed description of the invention
Fig. 1 is the 3-d modelling schematic diagram of aircraft fuel oil diffuser；
Fig. 2 is the fuel oil diffuser diagrammatic cross-section for not installing baffle plate；
Fig. 3 is the diffuser inside fuel pressure curve graph for not installing baffle plate；
Fig. 4 is the mounting design conceptual scheme of baffle plate of the present invention；
Fig. 5 is the diffuser inside fuel pressure contrast curve chart for not installing and installing baffle plate；
Fig. 6 is not install and install fuel oil spouting velocity contrast curve chart at the diffuser mesh of baffle plate.
Figure label title: the 1, interface of connecting tube and petroleum pipeline control valve, 2, connecting tube, 3, connecting tube and diffuser
Interface, 4, be provided with the mesh of diffuser upper half side wall, 5, the lower half side wall of the non-aperture of diffuser, 6, diffuser root.
Specific embodiment
The arrangement side of the present invention provides a kind of aircraft fuel oil diffuser and pressure-regulating device with pressure-regulating device
Method.The upper side wall of fuel oil diffuser uniformly opens up mesh as fuel outlet, and the lower wall that diffuser inside does not open up mesh is hung down
Several baffle plates of straight close installation make it tend to be uniform for adjusting the fuel pressure distribution in diffuser at mesh.Into
One step, fuel oil can uniformly be sprayed from mesh with lower speed, and then reduced and caused since fuel oil spouting velocity is excessively high
Electrostatic probability of happening.
In order to enable technical solution of the present invention and effect are more clear and define, it is detailed further to make as evidence with certain example
It describes in detail bright.It should be pointed out that specific implementation described herein is not intended to limit the present invention only to explain the present invention.
The present invention is further illustrated with a specific embodiment below.Take the length of fuel oil diffuserL =300mm, diameterD =
50mm, the entrance velocity of fuel oil diffuser are 3.6m/s.Mesh is opened up in the upper half side wall of diffuser, it is desirable that fuel oil is from mesh
Spouting velocity is all satisfied less than 1m/s.
The arrangement of baffle plate needs to consider three important design parameters, the i.e. height of baffle plate, position and quantity.In order to set
The convenience of meter and processing, the design of baffle plate need to meet following principle: 1) quantity of baffle plate should be lacked as far as possible；2) height of baffle plate
Degree should be consistent as far as possible, it is contemplated that baffle plate is excessively high to will lead to pipeline blockage, therefore height is no more than the 1/4 of tubing internal diameter；
3) baffle plate top is straight, and close installation vertical with fuel oil diffuser inner tubal wall；4) Position Design of baffle plate, needs with not
The fuel oil diffuser inside pressure characteristic distributions for installing baffle plate are reference frame.
The fuel oil diffuser inside pressure distribution of baffle plate is not installed, can be obtained, can also be passed through by testing measurement
Computational fluid dynamics simulation means obtain.Here, the fuel oil diffuser inside pressure distribution for not installing baffle plate passes through Numerical-Mode
It is quasi- to obtain, as shown in Figure 2 (pressure is gauge pressure value in figure).It can be seen that when fuel oil diffuser inside does not install baffle plate, pipeline
" building the pressure " phenomenon of root is more serious, and the pressure near line entry is obviously relatively low.The low-pressure area of diffuser inside is main
Concentrate on the front half section of diffuser.In the low-pressure area of fuel oil diffuser inside, it can substantially be divided into two ranges: first is that apart from expansion
Dissipate device entrance 0.1LLow pressure in range maintains area；Second is that 0.1L~0.7LRapid increase area in range.
It is not difficult to learn by Bernoulli equation, the pressure of pipeline low-pressure area will necessarily reduce its height while getting a promotion
The pressure of pressure area.Therefore, the pressure adjusting of fuel oil diffuser inside can pay close attention to low-pressure area.It is distributed according to above-mentioned pressure special
Sign is as can be seen that the pressure of diffuser low-pressure area needs to make following adjust: first is that low pressure maintain area (apart from diffusor entry 0 ~
0.1LIn range) pressure need to be promoted；Second is that rapid increase area leading portion is (apart from diffusor entry 0.3LNear) pressure need
It is promoted；Third is that rapid increase area middle section is (apart from diffusor entry 0.5LNear) pressure need to maintain.Therefore, it at least needs
3 baffle plates adjust the pressure of fuel oil diffuser inside.A kind of simple way is apart from diffusor entry 0.1LPlace's peace
A baffle plate is filled, other two baffle plate is 0.1L~0.5LIt is equidistantly installed in range, that is, is mounted on 0.3LWith 0.5L
Place.By fluid mechanics knowledge it is found that the tail area at first baffle plate rear can the voltage regulation result to second baffle plate generate
It influences, therefore the height of first baffle plate should be significantly lower than remaining baffle plate.Further, since the last one baffle plate is for tieing up
Local stress level is held, therefore its height can be consistent with the height of second baffle plate.Based on above-mentioned consideration, first folding
The height of flowing plate can be taken as 0.125D, the baffle plate height at another two is taken as 0.25D。
Fig. 5 is the diffuser inside fuel pressure correlation curve for not installing and installing baffle plate.Here pressure curve edge
Value near the diffuser plane of symmetry and close mesh.After baffle plate is installed, exported in the middle part of fuel oil diffuser with the mesh of leading portion
Pressure is promoted, and " building the pressure " phenomenon of root obtains biggish alleviation, and the outlet pressure overall distribution of mesh tends to be uniform.
Fig. 6 is the fuel oil spouting velocity correlation curve do not installed and installed near the diffuser mesh of baffle plate.As can be seen that not installing
When baffle plate, the requirement that is obvious bigger than normal and being more than 1m/s in the back segment of diffuser of fuel oil spouting velocity.However, fuel oil spouting velocity
Obviously less than normal in the middle leading portion of diffuser, especially close to the range of diffusor entry, fuel oil spouting velocity is almost nil, this meaning
Taste at this time mesh almost do not play the role of spread fuel oil.After installing baffle plate, fuel oil spouting velocity is in diffuser
Back segment is obviously weakened, and the fuel oil spouting velocity in diffuser at leading portion mesh is then significantly improved, fuel oil spouting velocity
The uniformity obviously improved.Further, since the uniformity of fuel oil spouting velocity is improved, therefore the fuel oil at whole mesh
Spouting velocity is all satisfied the requirement less than 1m/s.
Claims (6)
1. a kind of aircraft fuel oil diffuser, which is characterized in that the diffuser includes that one section of internal diameter of tank bottoms is arranged in beD, length beLCircular section pipeline；The root of the pipeline is closed, and half side wall offers netted aperture；Mesh is not being opened up
Other half sidewall bottom is equidistantly equipped with several baffle plates, and the entrance of the diffuser passes through one section of connecting tube and aircraft refuelling
Valve outlet is controlled to be connected；Fuel oil is flowed into from the entrance of the pipeline, and through spraying at side wall mesh, into fuel tanker.
2. a kind of aircraft fuel oil diffuser according to claim 1, it is characterised in that: the pipeline is straight to be mounted on aircraft
Tank bottoms, the netted aperture are uniformly provided with half side wall backwards to bottom of aircraft fuel tanks；It is straight at the top of the baffle plate, and
Vertically it is installed tightly to half side wall close to bottom of aircraft fuel tanks.
3. a kind of aircraft fuel oil diffuser according to claim 1, it is characterised in that: the height of the baffle plate is no more than
0.25D。
4. a kind of aircraft fuel oil diffuser according to claim 1, it is characterised in that: the number of the baffle plate is at least
3；Wherein, the height of first baffle plate is 0.125D, the distance apart from diffusor entry is 0.1L；Other two baffle plate
Height be 0.25D, it is arranged in apart from diffusor entry 0.3LWith 0.5LPlace.
5. a kind of method for arranging of fuel oil diffuser pressure-regulating device, which is characterized in that the method for arranging specifically: 1) sharp
The pressure distribution for the fuel oil diffuser inside for not installing baffle plate is obtained with experiment measurement or computational fluid dynamics simulation means；2)
The diffuser range for needing to adjust pressure is determined according to the pressure characteristic distributions；3) several bafflings of close installation in the range
Plate, and then adjust the pressure within the scope of this.
6. a kind of method for arranging of fuel oil diffuser pressure-regulating device according to claim 5, it is characterised in that: choose
0.125DWith 0.25DSeveral baffle plates of height carry out pressure adjusting, and baffle plate is closely vertically mounted on close to fuel tanker bottom
The fuel oil diffuser inner sidewall in portion；The position of baffle plate and number, not install the pressure of the fuel oil diffuser inside of baffle plate
Distribution situation determines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811612124.XA CN109808902A (en) | 2018-12-27 | 2018-12-27 | A kind of method for arranging of aircraft fuel oil diffuser and pressure-regulating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811612124.XA CN109808902A (en) | 2018-12-27 | 2018-12-27 | A kind of method for arranging of aircraft fuel oil diffuser and pressure-regulating device |
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| Publication Number | Publication Date |
|---|---|
| CN109808902A true CN109808902A (en) | 2019-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811612124.XA Pending CN109808902A (en) | 2018-12-27 | 2018-12-27 | A kind of method for arranging of aircraft fuel oil diffuser and pressure-regulating device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113911379A (en) * | 2021-11-23 | 2022-01-11 | 中国商用飞机有限责任公司 | Refueling system for aircraft |
| CN114313280A (en) * | 2022-01-07 | 2022-04-12 | 彩虹无人机科技有限公司 | Fuel oil diffuser |
Citations (5)
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|---|---|---|---|---|
| US6355096B1 (en) * | 2000-04-05 | 2002-03-12 | Aeromix Systems, Inc. | Mass transfer system |
| US6360730B1 (en) * | 1996-03-18 | 2002-03-26 | Fuel Dynamics | Inert loading jet fuel |
| JP2010195212A (en) * | 2009-02-25 | 2010-09-09 | Honda Motor Co Ltd | Fuel tank |
| CN103917437A (en) * | 2011-11-11 | 2014-07-09 | 考特克斯·特克斯罗恩有限公司及两合公司 | Method of producing a deflector device for fuel-refilling systems and construction kit with prefabricated components for producing a deflector device prototype |
| CN105438484A (en) * | 2015-11-30 | 2016-03-30 | 中航飞机股份有限公司西安飞机分公司 | Aircraft fuel system |
-
2018
- 2018-12-27 CN CN201811612124.XA patent/CN109808902A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6360730B1 (en) * | 1996-03-18 | 2002-03-26 | Fuel Dynamics | Inert loading jet fuel |
| US6355096B1 (en) * | 2000-04-05 | 2002-03-12 | Aeromix Systems, Inc. | Mass transfer system |
| JP2010195212A (en) * | 2009-02-25 | 2010-09-09 | Honda Motor Co Ltd | Fuel tank |
| CN103917437A (en) * | 2011-11-11 | 2014-07-09 | 考特克斯·特克斯罗恩有限公司及两合公司 | Method of producing a deflector device for fuel-refilling systems and construction kit with prefabricated components for producing a deflector device prototype |
| CN105438484A (en) * | 2015-11-30 | 2016-03-30 | 中航飞机股份有限公司西安飞机分公司 | Aircraft fuel system |
Non-Patent Citations (1)
| Title |
|---|
| 肖炎等: "民用飞机燃油扩散器设计研究", 《2016中国航空学会流体传动与控制学术会议》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113911379A (en) * | 2021-11-23 | 2022-01-11 | 中国商用飞机有限责任公司 | Refueling system for aircraft |
| CN114313280A (en) * | 2022-01-07 | 2022-04-12 | 彩虹无人机科技有限公司 | Fuel oil diffuser |
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Application publication date: 20190528 |