CN109209729A - A kind of microwave ignition system can be applied to engine chamber and method - Google Patents
A kind of microwave ignition system can be applied to engine chamber and method Download PDFInfo
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- CN109209729A CN109209729A CN201811089366.5A CN201811089366A CN109209729A CN 109209729 A CN109209729 A CN 109209729A CN 201811089366 A CN201811089366 A CN 201811089366A CN 109209729 A CN109209729 A CN 109209729A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P23/00—Other ignition
- F02P23/04—Other physical ignition means, e.g. using laser rays
- F02P23/045—Other physical ignition means, e.g. using laser rays using electromagnetic microwaves
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- Optics & Photonics (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
The invention discloses a kind of microwave ignition systems that can be applied to engine chamber, including control unit of engine, microwave source, microwave distributor and combustion chamber, microwave source by microwave distributor respectively with several combustion chambers, microwave plug is mounted in each assignment channel of microwave distributor, control unit of engine is connected with repetition high voltage power supply, microwave distributor and burner control respectively, described to repeat high voltage power supply and microwave source electric connection.In the present invention, microwave frequency is consistent with some electromagnetism eigenfrequency of combustion chamber, thus resonantly microwave energy can be coupled in combustion chamber.The microwave energy of certain frequency is coupled into the cylinder of engine when engine operation, and lights the burning indoor air-fuel mixture gas at the time of appropriate.Point then, action of plasma caused by remaining microwave energy and burning Indoor Combustion, to reach integral combustion in combustion chamber as quick as thought, gas mixture is promoted more completely to burn and reduce the discharge of tail gas.
Description
Technical field
The present invention relates to a kind of microwave ignition system and methods, in particular to a kind of to can be applied to the micro- of engine chamber
Wave point fire system and method, belongs to technical field of engines.
Background technique
A basic component is the combustion chamber for converting the chemical energy of fuel to mechanical energy in engine.To propeller for turboprop
Machine, such as gas-turbine aircraft engine, typical combustion-chamber shape is for tubbiness open at one end or partly or entirely by ring
Shape shape shell is constituted.In fact, an engine can have multiple tubbiness combustion chambers or an annulus combustion chamber.Engine
There can be precombustion chamber and mend combustion chamber.Other engines include: to start for the rotary engine and reciprocating-piston of automobile
Machine；Rocket engine；Ramjet engine and impulse duct engine.
Fuel in combustion chamber is lighted depending on several factors: oil gas temperature, the type of igniter, ignition energy, fuel
Air ratio, ignition energy input point, etc..
Combustion chamber needs an igniter to trigger combustion process.It is well known that being commonly used to automobile and aircraft engine
On igniter be plug ignition system.The ignition system generates a high voltage pulse and is added on spark plug, in spark plug
Two electrodes between generate a transient state high electric field (107Lie prostrate every meter of magnitude).This high electric field causes air-fuel mixture gas
Breakdown or electric discharge form plasma spark then and lead to the burning of oil gas mixture in combustion chamber.But spark plug is commonly mounted in
Or close to chamber wall with increase its in service life (it during fuel combustion can slowly ablation damage), while preventing its obstruction
The movement of piston.In the combustion chamber of certain aircraft engines, igniter is even mounted on chamber wall recessed grain.Cause
For chamber wall can absorb heat and the extinguishing of flame is caused (only just this initial stage to be overcome to put out when the volume of flame kernel is sufficiently large
Fire), it is wasted so as to cause three to ten percent fuel oil.
In addition, in order to reach the disruptive discharge of air-fuel mixture gas, the size and distance all very littles (2mm) of electrode, thus
Electric discharge occurs (to light) on a very small point, since the spread speed of burning point is extremely slow, needs about 100-200 micro-
The cylinder of the engine of the time automobile of second can be only achieved integral combustion, this slow combustion process results in following result: (1)
In order to engine synchronization, igniting need to shift to an earlier date.During this period of time, partial combustion work done resists the kinetic energy of engine, from
And leading to energy dissipation, whole efficiency is low (energy of waste five to ten percent).In fact the engine of plug ignition is used
Energy efficiency it is really lower, only about 30%, waste valuable fuel oil.(2) pollution is generated to environment.It is well known that an oxygen
The discharge amount for changing carbon (CO) is reduced with the increase of internal combustion engine air-fuel ratio.The fuel-air ratio choosing of best internal combustion engine
In the range of selecting being more than " chemical industry ideal " ratio (1:14.7) and reach ' poor limit ', for example, 1:20-25.On the other hand, it aoxidizes
The generation of nitrogen (NOx) is most sensitive to the time of igniting (being measured with the degree of before top dead center [BTDC]).Between upon initiation in advance
At 20 degree, nitrogen oxide caused by every mile (NOx) is from about 1,000 anxious increasing to 3000 parts.Therefore in order to reduce by an oxidation
Carbon, nitrogen oxide and other hydrocarbons, it is necessary to make that internal combustion engine operation is relatively low in fuel-air and the duration of ignition is closer to upper
(TDC) is better at dead point.
Recently, laser energy or infrared laser power have been introduced into igniting concept, see DeFreitas U.S. Patent number
5367869.Before this invention, movement and its fuel of the someone using piston in microwave energy research piston internal combustion engines
Combustion process is shown in Merlo U.S. Patent number 3589177 and Merlo U.S. Patent number 3703825.These patents stress how
Obtain its cylindrical body head in an engine cylindrical body cylinder, the resonance between cylindrical wall and piston area, to analyze piston
Ingredient in movement and cylinder.Because these methods to be to diagnose engine as target, thus using low-down microwave energy with
Exempt from the operation of interference system.
The target of this patent is to find a kind of more preferable, equipment that is more reliable and more effectively lighting and maintain burning and side
Method.This includes providing a kind of follow-on igniter, possessed by its not conventional plasma spark and flame igniter
Disadvantage.From the point of view of actual angle, this igniter and ignition system should be able to be as a kind of direct substitute or the existing points of substitution
Fiery system, to minimum or not need to redesign combustion chamber to use new system, easily to replace existing point
The upgrading of fiery system and ignition system.
Summary of the invention
It is a principal object of the present invention to provide a set of efficiency that internal combustion engine can be improved, the igniting system of exhaust emissions is reduced
System.Need only the smallest change can be used for existing internal combustion engine, low cost, easy to manufacture and installation, and operating cost requirement
It is low.This is a kind of microwave ignition system that can be applied to engine chamber and method.
In order to solve the problems in the existing technology, the present invention provides the following technical solutions:
The present invention provides a kind of microwave ignition system that can be applied to engine chamber and methods, including engine control
Unit processed, microwave source repeat high voltage power supply, microwave distributor and combustion chamber, the combustion chamber and are provided with several, the microwave
Source, respectively with several combustion chambers, is mounted in each assignment channel of the microwave distributor micro- by microwave distributor
Wave plug, the control unit of engine are connected with repetition high voltage power supply, microwave distributor and burner control respectively, the repetition
High voltage power supply and microwave source are electrically connected.
As a preferred technical solution of the present invention, the microwave source in the microwave ignition system produces in due course
It gives birth to and by the electromagnetic energy of microwave distributor transmission certain frequency, power and pulse length to combustion chamber, the electromagnetism of the frequency
Energy is consistent with some electromagnetism eigenfrequency of combustion chamber, thus resonantly microwave energy can be coupled in combustion chamber.
As a preferred technical solution of the present invention, the engine is that the rotation of automobile and reciprocating-piston start
The gas-turbine engine or aircraft jet formula engine or rocket engine or internal combustion engine generator of machine or aircraft and tank.
As a preferred technical solution of the present invention, when the internal combustion engine has multiple combustion chambers, the electromagnetic energy
Amount is respectively transmitted to each combustion chamber by a microwave distributor in due course.
As a preferred technical solution of the present invention, the eigen mode of the combustion chamber includes any suitable electromagnetism sheet
Sign mode, the microwave are the electromagnetic wave of any suitable frequency.
As a preferred technical solution of the present invention, the specific size and shape of the combustion chamber use electricity appropriate
Magnetic eigen mode and frequency, for example, cavity modes TM can be used when shape is cylindricalmn0, eigenfrequency and the combustion chamber
Length it is unrelated, wherein TM010More preferably, eigenfrequency is minimum for mode, thus the low cost of microwave source.
As a preferred technical solution of the present invention, the electromagnetic energy is provided by microwave sources such as magnetron, klystrons,
Wherein magnetron be optimal selection, because its cost is minimum, using most universal.
As a preferred technical solution of the present invention, the intrinsic frequency of microwave frequency and combustion chamber that the microwave source generates
Rate is consistent, and its output band width should meet eigenfrequency possible offset when combustion chamber is repeatedly lighted.
As a preferred technical solution of the present invention, the microwave energy that the microwave source generates should generate in the combustion chamber
Sufficiently strong electric field is to puncture and light the indoor air-fuel mixture gas of burning.
As a preferred technical solution of the present invention, the electromagnetic energy is finally defeated by microwave by each micro-wave coupler
Enter corresponding combustion chamber, the micro-wave coupler can be coupled in including toroidal magnetic field coupling or field coupling or waveguide openings
Interior all suitable methods.
The beneficial effects obtained by the present invention are as follows be devise fixed applied to shape, combustion chamber made of metal it is micro-
Wave ignition system, device and method.For microwave, such combustion chamber is also a microwave cavity.The system is appropriate
When generate and transmission certain frequency, power and pulse length microwave energy to the combustion chamber.What as long as we selected
Microwave frequency is identical as the eigenfrequency of some microwave resonance modes of the cavity, then microwave can be defeated with the mode of resonance
Enter into the cavity.When the microwave power of input is sufficiently large, the intracorporal electric field strength of chamber can enhance in a very short period of time to foot
Enough high-amplitudes (107Lie prostrate every meter of magnitude), breakdown or electric discharge, formation plasma so as to cause the intracorporal oil gas mixture of chamber
Spark is then directed at the indoor combustion reaction of burning.The plasma for lighting rear remaining microwave energy and Indoor Combustion of burning is made
With the electronics in plasma quickly moves in the cavity, to reach integral combustion in combustion chamber as quick as thought, that is, reaches ideal
Body light purpose.Later all remaining microwave energies continue to promote oil and gas mixture more completely to fire with action of plasma
It burns.
Compared with igniting, body igniting can shorten 5 to 25 times of burning time, the plasma bodily form that microwave or microwave generate
At body ignition energy will narrow down to possible minimum value burning time and do not generate detonation.This will lead to energy efficiency and improves about
20%.The discharge amount of HC, CO, NO also relatively reduce by 60%, 35% and 15% respectively.Therefore after using microwave ignition system,
Automobile engine is expected equally to be able to satisfy existing exhaust gas discharge limit standard without catalyst.Using microwave ignition system
Afterwards, function is started to generate bigger power, and can in the case where the low oil-gas ratio of 1:20-25 reliable ignition.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is microwave ignition system block diagram of the present invention；
Fig. 2 is the TM of cylindrical cavity of the present invention010Eigenfrequency and quality factor are with cavity radius and the variation relation of length
Figure；
Fig. 3 is the schematic diagram that microwave is inputted jet, turbogenerator by waveguide of the invention；
Fig. 4 is the magnetic field coupling method schematic diagram that coaxial line of the invention inputs microwave in engine combustion room；
Fig. 5 is the field coupling method schematic diagram that coaxial line of the invention inputs microwave in engine combustion room；
Fig. 6 is the computer simulation distribution map of the electric field (TM in inventive engine cylinder010)；
Fig. 7 is that the present invention by cylindrical waveguide goes to the microwave distributor schematic diagram that four square traveling waves are led；
Fig. 8 is the mechanical distribution block diagram that the present invention is used for microwave distributor；
Fig. 9 is repeat pulse power line map of the present invention.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, and preferred embodiment described herein is only used for
The description and interpretation present invention, is not intended to limit the present invention.
Embodiment 1
As shown in figs 1-9, the present invention provides a kind of microwave ignition system that can be applied to engine chamber and method,
Including control unit of engine, microwave source, high voltage power supply, microwave distributor and combustion chamber are repeated, if the combustion chamber is provided with
Dry, for the microwave source by microwave distributor respectively with several combustion chambers, each distribution of the microwave distributor is logical
Be mounted on microwave plug in road, the control unit of engine respectively with repeat high voltage power supply, microwave distributor and burner control
System connection, it is described to repeat high voltage power supply and microwave source electric connection.
Figure one is the composition figure of entire ignition system.First select one can export suitable frequency, frequency bandwidth, power and
The microwave source of pulse length.The method for how choosing these parameters has specific descriptions later.The microwave source is by a repetition arteries and veins
Rush power drives.The pulse power according to control unit of engine come instruction export microwave source when suitable needed for arteries and veins
Rush electric energy.This pulse electric energy is converted into microwave energy by microwave source.
Since the output pulse power of the microwave source is bigger, it is therefore desirable to be isolated with isolator.Such microwave energy
Amount can only be transferred out unidirectionally from microwave source.Any possible reflected microwave energy will be isolated or absorb, to prevent microwave
Source is damaged.The microwave of microwave source output later is transferred to four-way microwave distributor by waveguide or coaxial line.Certain microwave sources
Output may be led with square traveling wave.At this point, a rectangle will be needed to coaxial converter, vice versa if being transmitted with coaxial line.
The attachment of figure microwave source shown in includes the attachmentes such as above-mentioned isolator and converter.
The function of microwave distributor shown in figure one is that microwave is transferred to like clockwork in some cylinder.The microwave
Distributor receives the instruction come from control unit of engine, and when No. n-th cylinder needs to light a fire, n microwave channel will be beaten
It opens, microwave energy is all transferred in No. n-th cylinder.It is with reference to (i.e. engine turns with the degree of rotation of engine crankshaft
Two circles), in the slewing area of 0-4 π, four cylinders are successively ignited.For example, No. 1 cylinder is lighted when " 0 " is spent, and No. 2,3
Number and No. 4 cylinders be ignited respectively at " π ", " 2 π " and " 3 π ".Then No. 1 cylinder is ignited at " 4 π " again, it is all in this way and
It renews.
In order to which microwave is inputted some cylinder, it is necessary to have a microwave coupling device in transmission end.Microwave coupling dress
That sets is mainly used in microwave coupling to cylinder, while also functioning to the effect of sealing of cylinder, thus may be simply referred to as microwave
Plug.
When piston is compressed to away from top dead-centre about 10-20 microsecond, i.e., when piston reaches the position away from top dead-centre about 1-2 degree
(the 0.5-1 degree for being equivalent to engine crankshaft), microwave inputs in cylinder and its resonating electric field is strong within the time of submicrosecond
Degree reaches 107 volts every meter, so that cylinder charge punctures immediately.Due to the body ignition effect of microwave, and piston is moved to extremely
Cylinder total volume when point only has 50 cubic centimetres or less, thus Combustion Energy travels in cylinder within the time of submicrosecond
Every nook and cranny.The time quantum lighted a fire in advance in this way is minimum negligible, no longer with the revolving speed of engine, load or environment temperature and
Become.To greatly simplifie the ignition control of engine.
As known to microwave engineering techniques personnel, the combustion chamber as microwave cavity can have infinite multiple electromagnetism
Intrinsic cavity mode.These usual modes are TEmnlOr TMmnl, and each mode have a corresponding eigenfrequency f and
Quality factor q.For possessing the cavity of simple shape, for example, cylindrical body or square row body, these modes, eigenfrequency and quality
The factor can be indicated with analytic formula.Cavity for complicated shape possesses inhomogeneous medium in the cavity of simple shape
When, this tittle can simulate to obtain with general electromagnetic wave software.The FEMLAB software of the HFSS or Comsol of Agilent all may be used
To meet requirement here.For the piston h type engine h that some aircrafts and all automobiles use, cylinder be it is cylindrical, it is optional
TMmn0As resonance mode.The mode generates an axial electric field in cylinder, and its eigenfrequency is not with the round-trip fortune of piston
Dynamic variation.Suitable nonnegative integer m and n, which can be selected, according to the radius of cylinder keeps the frequency of microwave source consistent with its.In identical function
Under rate, the price of the usual humbleer wave source of frequency is also lower.So the value of m and n should be selected lower.
Figure two gives TM010The relationship that the eigenfrequency and quality factor of mode change with the radius and length of cylinder.
For 4.0-5.5 centimetres of radius of typical Motor Engine Cylinder, corresponding eigenfrequency is 2.875-2.1GHz.If
Manufacturing material used in cylinder is aluminium alloy, then quality factor is about 3000.Certainly, there are fuel-air mixtures in practical casing top half
Body, at this moment its eigenfrequency should be 1-2% more slightly lower than the result in figure two.And actual cylinder is due to oil spout and the presence of gas nozzle
Its eigenfrequency can be slightly changed with the movement of piston.
Since microwave igniting has the advantage of " body is lighted ", microwave igniting is always chosen under certain point of very close TDC
It carries out, the resonant frequency of such cavity just has almost no change.But under different operating condition, due to combustion used every time
Oil will be different, for example, in cold climates, when engine is initially run, inputting the fuel oil phase of cylinder when igniting every time
To more, in this way when steam-cylinder piston is compressed to TDC, the dielectric constant of air-fuel mixture gas will be slightly changed.It is sent out according to automobile
(0.15-0.6 centimetres) of variation reckoning of the common each oil inlet quantity of motivation, the intracorporal Gases dielectric constant variation of chamber is 1.005-
1.020.This will bring the changes delta f/f=- Δ ε of resonant frequencyr/2εr, i.e., about 0.75% variation, even if frequency bandwidth is very poor
Magnetron can meet such bandwidth requirement.
The eigenfrequency and quality factor of cavity mode can also be obtained by testing measurement.As long as microwave professional
The use experience for possessing the adjustable microwave source of frequency and vector network analyzer, both knows about and how to measure.Therefore this patent is no longer
Carefully state.
The pulse power of microwave source output must the sufficiently large breakdown that can just cause oil gas mixture in cylinder.For above-mentioned
TM mode, if field strength 10 in cylinder7Every meter is lied prostrate as required breakdown voltage, then r=5 centimetres and l=0.5 lis of length of radius
Total electromagnetic energy in the cylinder of rice (in TDC) when igniting is calculated as 4 millijoules by following formula.
If we select microwave pulse length for τ, input power Pin, then in cavity electromagnetic energy W at any time t with such as
Lower mathematical relationship increases:
In order to reach required W in pulse length τ0, it is necessary to meet:
τ≈Q/2f
And
Pin=2 π fW0/Q
For above-mentioned Motor Engine Cylinder, microwave pulse length should 0.5-1 microsecond, microwave pulse
Power should at least 20kW.In view of the highest frequency of common Motor Engine Cylinder igniting is 280Hz, then microwave pulse
Time duty factor maximum value is 3 × 10-5, therefore the mean power of microwave source is several watts.When in view of microwave in systems
Loss and part microwave will be used for the heating of air-fuel mixture gas, and actually required power can be more greatly.
As described in claims of the present invention, microwave plug of the present invention can be coupled with including toroidal magnetic field, electricity
The method of field coupling or waveguide coupling.In order to be described in further detail, below with three different types come schematically illustrate.
Figure three is that microwave is inputted aircraft jet formula engine chamber using rectangular waveguide (being also possible to circular waveguide)
Interior schematic diagram.The end of waveguide is sealed with ceramics and sprays into waveguide to prevent fuel oil and gas.And it can be using Waveguide end face
The different orientation of long side chooses TM or TE wave as cavity modes.For air E from right, microwave F from upper and enter, A is combustion in figure three
Expect that input part, B are combustion chamber, C is closing ceramics, and D is input waveguide, and G is air intake.The thickness of ceramics and waveguide
Specific size the reflection of microwave should be kept minimum under the working frequency of design by the software simulation of similar HFSS.
Figure four is the schematic diagram inputted microwave using coaxial line in engine combustion room.The center of coaxial line and crust exist
End is by an annular or rectangular coil short.This is magnetic field coupling method, and microwave is inputted from indoor circumferential edge of burning.Coaxial line
End with ceramics seal with high temperature-proof damage coaxial line.And can by using different coils be orientated choose TM or
TE wave is as cavity modes.
Figure five is the schematic diagram inputted microwave using coaxial line in Motor Engine Cylinder.A is coaxial line in figure, and B is
Combustion chamber, C are piston.The coaxial line of terminal open circuit is used in microwave input, and is sealed with ceramics and damaged coaxial line with high temperature-proof.This
Kind method can excite TM cavity modes.And the external form of microwave plug can be designed to and the shape of standard spark plug and size one
It causes, can be mounted directly on engine, without modification engine.
Figure six is the computer simulation that microwave inputs in the cylinder of automobile engine.R=4.5 centimetres of cylinder radius and length
L=2 centimetres, the microwave frequency of input is 2.5GHz, and pulse power P is 100kW.Analog result shows the microwave excited in cylinder
Cavity modes are TM010, an axial electric field is generated in cylinder.And the axial electric field reaches 10 within submicrosecond7Volt is every
Rice.
Heretofore described microwave distributor can suitably be done with all including machine driving, electronic control
Method.In order to be described in further detail, below with an example come schematically illustrate (see figure seven).Figure seven illustrate one by cylinder
Waveguide goes to the method that four square traveling waves are led.Four square traveling waves, which are led, is divided to two pairs and is located at different positions on cylinder axis.Its
Between be divided into λg/ 2 integral multiple, and have the end of a pair of cylindrical waveguide against short circuit.Two of them square traveling wave is led in circumference
Position on direction is identical, and remaining two differ 180 ° with the first two in circumferential phase.It can be in rectangular waveguide and cylinder
Four interfaces of waveguide respectively dispose a wealthy door by the instruction of control unit of engine to control to open or close to control it, just
As in-engine other valves.When cylinder when certain channel needs to light a fire, the valve in the channel, which turns on, allows microwave to pass
The defeated past.
Microwave channel also can choose purely mechanic method.Figure eight show a cylindrical metal box open at one end,
The can is assemblied in cylinder tip shown in figure seven, and its internal diameter is identical as the internal diameter of above-mentioned cylindrical waveguide.In its circle
Two bigger rectangular openings are opened on week.The two rectangular openings differ 90 ° in phase.The device can freely turn in cylindrical waveguide
It moves and its revolving speed is controlled by engine.Choose the half that it is engine speed, when the cylinder when certain channel needs to light a fire, opening
It is just corresponding with the rectangular waveguide in the channel, thus microwave energy is transferred to this channel and goes.
The repeat pulse power of driving microwave source can use the existing high pressure generation route of engine and slightly change.
The high pressure that the existing ignition system of automobile engine generates is that a RC discharges the transient pulse to be formed, without flat-top width.And
Microwave source needs the voltage repetition pulse for having certain flat-top width τ.The existing high pressure of engine is generated to the electricity in route
Container, which changes a pulse-forming line into, can reach requirement (see figure nine).It is " Blumlein " pulse shaping shown in figure nine
Line is made of the coaxial line of two sections of equal lengths.τ=l/v that the circuit generates, l is the total length of two sections of coaxial lines, v here
The spread speed for being electromagnetic wave in coaxial line.For common 50 Ω coaxial line, v is about 2 × 108Metre per second (m/s).Pulse shaping
Line can also concentrate circuit composition with inductance capacitance.Pulse-forming line in figure nine is also possible to other forms.And the arteries and veins
Punching, which forms line, can also change to the secondary to generate better impulse waveform, but the pressure resistance to line is formed of transformer shown in figure nine
It is required that higher.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (10)
1. a kind of microwave ignition system that can be applied to engine chamber, including control unit of engine, microwave source, repetition height
Voltage source, microwave distributor and combustion chamber, which is characterized in that the combustion chamber is provided with several, and the microwave source passes through micro-
Wavelength-division orchestration with several combustion chambers, is mounted on microwave plug, institute in each assignment channel of the microwave distributor respectively
Control unit of engine is stated to connect with repetition high voltage power supply, microwave distributor and burner control respectively, it is described to repeat high-voltage electricity
Source and microwave source are electrically connected.
2. a kind of microwave ignition method that can be applied to engine chamber according to claim 1, which is characterized in that institute
The microwave source in microwave ignition system is stated to generate in due course and transmit certain frequency, power and arteries and veins by microwave distributor
The electromagnetic energy of length is rushed to combustion chamber, the electromagnetic energy of the frequency and some electromagnetism eigenfrequency of combustion chamber are consistent, thus
Resonantly microwave energy can be coupled in combustion chamber.
3. a kind of microwave ignition system that can be applied to engine chamber according to claim 2, which is characterized in that institute
State gas-turbine engine or the aircraft spray of rotation and conventional engine or aircraft and tank that engine is automobile
Gas formula engine or rocket engine or internal combustion engine generator.
4. a kind of microwave ignition system that can be applied to engine chamber according to claim 3, which is characterized in that institute
When stating internal combustion engine has multiple combustion chambers, the electromagnetic energy is respectively transmitted in due course by a microwave distributor
Each combustion chamber.
5. a kind of microwave ignition system that can be applied to engine chamber according to claim 2, which is characterized in that institute
The eigen mode for stating combustion chamber includes any suitable electromagnetism eigen mode, and the microwave is the electromagnetism of any suitable frequency
Wave.
6. a kind of microwave ignition system that can be applied to engine chamber according to claim 2 or 4, feature exist
In the specific size and shape of the combustion chamber, using electromagnetism eigen mode appropriate and frequency, for example, shape is cylinder
When, cavity modes TM can be usedmn0, eigenfrequency is unrelated with the length of the combustion chamber, wherein TM010Mode is more preferably, intrinsic
Frequency is minimum, thus the low cost of microwave source.
7. a kind of microwave ignition system that can be applied to engine chamber according to claim 2, which is characterized in that institute
It states electromagnetic energy to be provided by microwave sources such as magnetron, klystrons, wherein magnetron is optimal selection, because its cost is minimum, uses
It is most universal.
8. a kind of microwave ignition system that can be applied to engine chamber according to claim 7, which is characterized in that institute
The microwave frequency for stating microwave source generation is consistent with the eigenfrequency of combustion chamber, and should to meet combustion chamber more for its output band width
Secondary eigenfrequency possible offset when lighting.
9. a kind of microwave ignition system that can be applied to engine chamber according to claim 8, which is characterized in that institute
The microwave energy for stating microwave source generation should generate sufficiently strong electric field in the combustion chamber to puncture and light the indoor oil of burning
Oxygen mixture.
10. a kind of microwave ignition system that can be applied to engine chamber according to claim 2, which is characterized in that
Microwave is finally inputted corresponding combustion chamber by each micro-wave coupler by the electromagnetic energy, and the micro-wave coupler can use packet
It includes toroidal magnetic field coupling or field coupling or waveguide openings is coupled in interior all suitable methods.
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| CN201811089366.5A CN109209729A (en) | 2018-09-18 | 2018-09-18 | A kind of microwave ignition system can be applied to engine chamber and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810326A (en) * | 2020-08-18 | 2020-10-23 | 武汉大学 | Microwave gasoline mixing type cylinder engine |
| EP4160001A1 (en) * | 2021-09-29 | 2023-04-05 | MWI Micro Wave Ignition AG | Microwave pre-chamber ignition for a combustion engine |
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| US3934566A (en) * | 1974-08-12 | 1976-01-27 | Ward Michael A V | Combustion in an internal combustion engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111810326A (en) * | 2020-08-18 | 2020-10-23 | 武汉大学 | Microwave gasoline mixing type cylinder engine |
| EP4160001A1 (en) * | 2021-09-29 | 2023-04-05 | MWI Micro Wave Ignition AG | Microwave pre-chamber ignition for a combustion engine |
| WO2023052082A1 (en) * | 2021-09-29 | 2023-04-06 | Mwi Micro Wave Ignition Ag | Microwave prechamber ignition for an internal combustion engine |
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