CN108561232A - The igniting fuel flow control method of auxiliary power unit point circle fuel feeding - Google Patents
The igniting fuel flow control method of auxiliary power unit point circle fuel feeding Download PDFInfo
- Publication number
- CN108561232A CN108561232A CN201711293773.3A CN201711293773A CN108561232A CN 108561232 A CN108561232 A CN 108561232A CN 201711293773 A CN201711293773 A CN 201711293773A CN 108561232 A CN108561232 A CN 108561232A
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- Prior art keywords
- fuel
- apu
- oil
- fuel flow
- igniting
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3076—Controlling fuel injection according to or using specific or several modes of combustion with special conditions for selecting a mode of combustion, e.g. for starting, for diagnosing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Feeding And Controlling Fuel (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Fuel-Injection Apparatus (AREA)
- Nozzles For Spraying Of Liquid Fuel (AREA)
Abstract
The invention belongs to aero-engine digital control technology fields, specially the igniting fuel flow control method of auxiliary power unit point circle fuel feeding.Using the Duty ratio control pattern of switch quick on-off, the fuel flow in auxiliary power unit (APU) the starting ignition stage of adjusting, aim to solve the problem that APU ignition phases, when the working connection of fuel dispenser is connected, since fuel oil flow area is uprushed, cause that fuel flow is excessive, fuel pressure is too low, fuel-oil atmozation is insufficient, so that the burning things which may cause a fire disaster that working connection is formed before connecting in start oil circuit fuel feeding, it is put out by water by this excessive low-voltage fuel, the failure for causing starting process flame-out.Method using the present invention can reduce its fuel flow, solve the problem of that the original constant flow rate of APU start oil circuits is excessive, can not light a fire under high altitude conditions starting.
Description
Technical field
The invention belongs to aero-engine digital control technology fields, the specially igniting of auxiliary power unit point circle fuel feeding
Fuel flow control method.
Background technology
The fuel control system of one major class APU, structural principle is as shown in Figure 1, by fuel oil regulating device, priming valve SFV
It is constituted with main valve MFV, SFV, MFV control the break-make of start oil circuit, working connection respectively, the pilot jet being connected with start oil circuit
Circulation area is small so that the fuel oil flow resistance of start oil circuit is big, flow is small, atomizing effect is good, is easily formed igniting burning things which may cause a fire disaster；With main oil
The circulation area of the connected main burner in road is big, and the adjustable range of fuel flow is big, and the fuel oil to adapt to big state controls.
The timing control that this one kind APU is started is as shown in Fig. 2, as APU turn up NG1, and only start oil circuit connects fuel feeding,
Since start oil circuit circulation area is small, small flow, high oil pressure, the good fuel oil of atomizing effect and air fully blend, and are ignited
The spark ignition that attachment generates, forms stable burning things which may cause a fire disaster；Since start oil circuit fuel delivery is limited, as APU turn up NG2,
Working connection is connected, since working connection circulation area is big, transports to the fuel pressure rapid drawdown of combustion chamber, fuel-oil atmozation is deteriorated, by main oil
The low-voltage fuel that road sprays may put the burning things which may cause a fire disaster formed by start oil circuit out by water, lead to starting failure.
When being connected for working connection, since fuel flow communication area is uprushed, cause fuel pressure plunge and fuel-oil atmozation effect
Fruit is deteriorated so that APU is easy to flame-out problem, and traditional control method is to increase to start fuel flow, to offset oil pressure reduction
Influence, fuel flow formula：
In formula, WF is fuel flow, and μ is discharge coefficient, and A is circulation area, and ρ is fuel density, and Δ P is before and after nozzle
Oil pressure is poor.
Since fuel feeding pressure difference and circulation area are at quadratic relationship, to offset oil pressure reduction certainly will greatly increase fuel delivery,
The APU overtemperatures for easily causing starting process, on the one hand jeopardize that APU is safe to use, are on the other hand also for the service life of APU
Unfavorable.
Invention content
The purpose of the present invention
In order to solve in APU starting process, when working connection is connected, since fuel flow communication area is uprushed so that fuel pressure
The problem of bust, fuel-oil atmozation are deteriorated, stop working so as to cause combustion chamber, lead to starting failure, it is proposed that auxiliary power unit point
Enclose the igniting fuel flow control method of fuel feeding.
Technical scheme of the present invention
The igniting fuel flow control method of the auxiliary power unit point circle fuel feeding of the present invention, when according to APU starting controls
Sequence adopts the following technical scheme that：
1.APU remains static, and after receiving starting order, connects starting motor band and turns APU, and it is attached to connect igniting
Part forms the electric spark for igniting.
2. when motor band, which turns APU, reaches NG1 rotating speeds, priming valve is powered, and start oil circuit is connected, by the rotation on start oil circuit
The fuel oil of liquid is formed the good mist of oil of atomization quality by flow nozzle, by the spark ignition for attachment of lighting a fire, is formed torch, is risen
The fuel flow of dynamic oil circuit is controlled by WF=F (NG, P1).
3. when APU rotating speeds reach NG2, priming valve on-state is kept, the quick of duty ratio mode is carried out to main valve
On-off controls, to ensure the fuel flow provided in a manner of Duty ratio control in unit interval planted agent and engine start fuel oil stream
It is flux matched；
4. with the promotion of APU rotary regimes, chamber pressure, temperature increase, and fuel oil burning condition gradually improves, and burn
Stability enhancing, when rotating speed reaches NGX, main valve is transferred to long logical fuel feeding pattern, by main valve and priming valve fuel feeding simultaneously, fuel oil
Flow is controlled by WF=F (NG, P1).
5. when APU rotating speeds reach NG3, disengage and start motor, accelerate by the power that itself combustion gas generates, by main valve and
Fuel feeding, fuel flow are controlled priming valve by WF=F (NG, P1) simultaneously.
6. when APU rotating speeds reach NG4, priming valve and igniting attachment are disconnected, by main valve fuel feeding, fuel flow presses WF=F
(NG, P1) is controlled.
7. when APU rotating speeds reach NGSTD, APU starting control processes terminate, and are transferred to the control of steady operational status.
The present invention has the advantage that effect
Core of the invention thought is quick change fuel flow communication area A, needs oil mass to carry out fuel feeding with normal starting, keeps away
Exempted from conventional method due to over feeding overtemperature；Simultaneously as main valve quick on-off, priming valve length are logical, disconnected in main valve
Cheng Zhong, start oil circuit can form stable, the good mist of oil of atomizing effect by its swirl nozzle, in the electrical fire of igniting attachment
Under flower effect, there is stable lighting-off torch, the penetrating fuel oil when working connection that goes to ignite is connected ensures reliable ignition.
Description of the drawings
Fig. 1 is fuel feeding sequence diagram；
Fig. 2A PU fuel control systems；
Fig. 3 APU start timing logics；
APU start timings logic under Fig. 4 Duty ratio controls；
Fig. 5 Duty ratio controls.
Specific implementation mode
The igniting fuel feeding control method to the present invention is described in detail with reference to the accompanying drawings and examples.
Embodiment：
APU fuel control systems export fuel oil as shown in Figure 1, fuel oil regulating device presses control plan WF=F (NG, P1),
Main valve and priming valve control the break-make of working connection, start oil circuit respectively.In formula, NG is APU rotating speeds, and P1 is APU inlet pressures, WF
For fuel flow.In this example, working connection circulation area is big, and after main valve is connected, fuel pressure plunges, easily flame-out.
Specific implementation step and relevant parameter are as follows：
1.APU is in illegal state, after receiving starting order, connects and starts motor and igniting attachment, start motor band
Turn APU；
When 2.APU turn ups 3%, delivery temperature this moment is recorded, is denoted as T40, priming valve is connected, by WF=F (NG, P1)
Fuel feeding；
When the difference of 18% or more 3.APU turn ups and current delivery temperature T4 and T40 are more than 50 DEG C, priming valve length is logical,
By the break-make of duty ratio mode control bound, it is 100ms to take duty cycle, by 5% precision controlling duty ratio, duty ratio control
Mode processed as shown in figure 4, the duty ratios that export in order to control of note X, X values are 0,5,10,15,20,25,30,35,40,45,50,
55,60,65,70,75,80,85,90,95, one of 100, fuel oil regulating device exports fuel flow, i.e. F by NG=55%
(55%, P1), by gradually increasing duty ratio X, it is F (NG, P1) to make the fuel flow that working connection and start oil circuit export；
A. when main valve is connected, fuel oil is flowed out from working connection, and flow is big, pressure is low, atomization is poor, may put torch out by water, unburned
The fuel oil of burning some residual in the combustion chamber；
B. when main valve disconnects, only priming valve fuel feeding, fuel-oil atmozation is good, forms torch, rekindles entire combustion chamber (this
When the indoor fuel oil that burns it is more).
Such fuel system make the lasting fuel feeding that the mist of oil formed by priming valve in combustion chamber and main valve are formed compared with
It is alternately present in short controlling cycle, ensure that small fuel flow reliable ignition.This stage start fuel flow by WF=F (NG,
P1 it) controls.
When the difference of 45% or more 4.APU turn ups and current delivery temperature T4 and T40 are more than 450 DEG C, main valve, starting
Valve length is logical, by WF=F (NG, P1) fuel feeding；
When 5.APU turn ups 50%, shutdown starts motor, and main valve, priming valve length are logical, by WF=F (NG, P1) fuel feeding；
When 6.APU turn ups 70%, shutdown igniting attachment and priming valve, main valve length is logical, by WF=F (NG, P1) fuel feeding；
When 7.APU turn ups 95%, starting process terminates, and main valve length is logical, and APU fuel oil streams are controlled by steady state operation
Amount.
Claims (2)
1. the igniting fuel flow control method of auxiliary power unit point circle fuel feeding, it is characterised in that：This method includes following step
Suddenly：
Step 1, APU remain static, and after receiving starting order, connect starting motor band and turn APU, and it is attached to connect igniting
Part forms the electric spark for igniting；
Step 2, when motor band, which turns APU, reaches NG1 rotating speeds, priming valve is powered, and start oil circuit is connected, by start oil circuit
The fuel oil of liquid is formed the good mist of oil of atomization quality by swirl nozzle, by the spark ignition for attachment of lighting a fire, forms torch,
The fuel flow of start oil circuit is controlled by WF=F (NG, P1)；
Step 3 keeps priming valve on-state when APU rotating speeds reach NG2, and the quick of duty ratio mode is carried out to main valve
On-off controls, to ensure the fuel flow of Duty ratio control pattern offer in unit interval planted agent and engine start fuel oil stream
It is flux matched；
Step 4, with the promotion of APU rotary regimes, chamber pressure, temperature increase, and fuel oil burning condition gradually improves, and fire
The stability of burning enhances, and when rotating speed reaches NGX, main valve is transferred to long logical fuel feeding pattern, by main valve and priming valve while fuel feeding, combustion
Oil stream amount is controlled by WF=F (NG, P1)；
Step 5 disengages when APU rotating speeds reach NG3 and starts motor, accelerates by the power that itself combustion gas generates, by main valve
Fuel feeding, fuel flow are controlled by WF=F (NG, P1) simultaneously with priming valve；
Step 6 disconnects priming valve and igniting attachment when APU rotating speeds reach NG4, and by main valve fuel feeding, fuel flow presses WF=F
(NG, P1) is controlled；
Step 7：When APU rotating speeds reach NGSTD, APU starting control processes terminate, and are transferred to the control of steady operational status.
2. according to claim 1, it is characterised in that：The Duty ratio control pattern is continuous Duty ratio control mould
Formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711293773.3A CN108561232B (en) | 2017-12-07 | 2017-12-07 | Ignition fuel flow control method for sub-circle oil supply of auxiliary power device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711293773.3A CN108561232B (en) | 2017-12-07 | 2017-12-07 | Ignition fuel flow control method for sub-circle oil supply of auxiliary power device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108561232A true CN108561232A (en) | 2018-09-21 |
| CN108561232B CN108561232B (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711293773.3A Active CN108561232B (en) | 2017-12-07 | 2017-12-07 | Ignition fuel flow control method for sub-circle oil supply of auxiliary power device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109441645A (en) * | 2018-12-11 | 2019-03-08 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of fuel flow control method starting auxiliary power unit APU |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070095070A1 (en) * | 2004-02-17 | 2007-05-03 | Riley Harold J | Control logic for fuel controls on APUs |
| EP2772438B1 (en) * | 2013-02-28 | 2016-01-20 | Honeywell International Inc. | Auxiliary power units (APUs) and methods and systems for activation and deactivation of a load compressor therein |
| CN105569847A (en) * | 2015-12-11 | 2016-05-11 | 中国航空工业集团公司西安航空计算技术研究所 | Auxiliary power unit starting acceleration fuel oil flow control method |
| CN206095604U (en) * | 2016-08-30 | 2017-04-12 | 成都飞亚航空设备应用研究所有限公司 | Aircraft auxiliary power device test system |
| CN206309518U (en) * | 2016-12-02 | 2017-07-07 | 中国直升机设计研究所 | A kind of air pipe system started for helicopter engine |
-
2017
- 2017-12-07 CN CN201711293773.3A patent/CN108561232B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070095070A1 (en) * | 2004-02-17 | 2007-05-03 | Riley Harold J | Control logic for fuel controls on APUs |
| EP2772438B1 (en) * | 2013-02-28 | 2016-01-20 | Honeywell International Inc. | Auxiliary power units (APUs) and methods and systems for activation and deactivation of a load compressor therein |
| CN105569847A (en) * | 2015-12-11 | 2016-05-11 | 中国航空工业集团公司西安航空计算技术研究所 | Auxiliary power unit starting acceleration fuel oil flow control method |
| CN206095604U (en) * | 2016-08-30 | 2017-04-12 | 成都飞亚航空设备应用研究所有限公司 | Aircraft auxiliary power device test system |
| CN206309518U (en) * | 2016-12-02 | 2017-07-07 | 中国直升机设计研究所 | A kind of air pipe system started for helicopter engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109441645A (en) * | 2018-12-11 | 2019-03-08 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of fuel flow control method starting auxiliary power unit APU |
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| Publication number | Publication date |
|---|---|
| CN108561232B (en) | 2020-06-09 |
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