CN108562689A - A kind of constant volume burning experimental provision and combustion experimental system and method including it - Google Patents
A kind of constant volume burning experimental provision and combustion experimental system and method including it Download PDFInfo
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- CN108562689A CN108562689A CN201810008056.XA CN201810008056A CN108562689A CN 108562689 A CN108562689 A CN 108562689A CN 201810008056 A CN201810008056 A CN 201810008056A CN 108562689 A CN108562689 A CN 108562689A
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Abstract
The invention discloses a kind of constant volume burning experimental provisions, including cavity, ignitor, motor, frequency converter, control unit and the more desk fan leaf devices being installed on cavity, wherein, ignitor is installed in the cavity, the center of discharge tip is located at the center of cavity, it is all connected with a frequency converter and a motor per desk fan leaf device, control unit is connect with each frequency converter, it is instructed by being sent to each frequency converter, control the rotating speed of corresponding motor, corresponding flabellum device is driven to rotate, to form Turbulent Flow Field in the cavity.The present invention controls the rotation direction and velocity of rotation of more desk fan leaf devices by control unit respectively, can form various types of turbulent environments in the cavity, for simulating all kinds of true combustion processes, while can control the turbulence intensity of the turbulent environment of formation again.A kind of method for carrying out premixed combustion experiment the invention also discloses constant volume burning experimental system including above-mentioned constant volume burning experimental provision and using the system.
Description
Technical field
The present invention relates to technical field of fuel combustion, and in particular, to a kind of constant volume burning experimental provision and including its
Combustion experimental system and method.
Background technology
Utilization and control to burning, which are the mankind, can be detached from other animals, increase productivity, realize good life most
Important production practices, the burning of fuel are the main energy sources in human being's production and life.In production and living practice, combustion
The burning of material, which is all the turbulent environment for being happened among turbulent environment, and burning when occurring, to be complicated and is also varied
's.Only combustion process of the full cognizance fuel in various Complex Flows environment, understand fuel in depth in various Complex Flows
Combustion characteristics in environment could efficiently and effectively control according to the difference of flowing environment and optimize combustion process, improve heat
Can and power-equipment dynamic property and fuel economy, and the problems such as control the generation and discharge of burning pollutant.Therefore, it is firing
In the research of the combustion characteristics of material, the combustion process in turbulent environment is the emphasis and core of research.
Currently, in turbulent environment in the research of the combustion process of fuel, carry out work usually using bunsen burner
Make, experiment work that is a small number of then quickly moving construction turbulent environment development constant volume premixed combustion using orifice plate in CONSTANT VOLUME MODEL COMBUSTION CHAMBER
Make.
When being conducted a research using bunsen burner, mainly by setting up hole in the gas transport pipe of bunsen burner
Plate realizes the construction of turbulent environment using gas by the region of turbulent wake of orifice plate, in bunsen burner gas transport pipe end
Igniting is implemented to fuel to realize Premixed Turbulent Flames.Although bunsen burner can simulate some simple practical flames, such as
Flame combustion process in static environment on gas-cooker, but its working method determine it simulate it is more true, generally
There are many technical bottlenecks when combustion process.For example, using automobile engine as representative internal combustion engine and using gas turbine as generation
In the external-combustion engine of table, the combustion process of fuel be flame in Complex Flows environment to space Free Development, and this life is burnt
Flame on device transports pipe end in burner gas is scheduled on, and the achievable flame of bunsen burner can not simulate this completely
Combustion process in a little true power plants；The flowing environment that bunsen burner can be built, which is one, has the flowing of mainstream to pulse,
This flowing environment exists only in the root stayed and determine flame, however flame can seldom occur in actual production practical experience of life and there was only certain
One local location local phenomenon in laminar flow environment of other flames in turbulent environment.And bunsen burner turbulent flow
Characteristic be by change orifice plate position and structure and gaseous state fuel flow rate realize turbulence intensity variation,
The turbulence intensity that this simulator is built depends greatly on orifice plate aperture size and fuel flow rate, and turbulence intensity is being fired
Significant changes do not occur during burning, this turbulent flow environment for not meeting actual combustion process Flame periphery continues sending out
Changing.
CONSTANT VOLUME MODEL COMBUSTION CHAMBER may be implemented simulation internal combustion engine and with ball flame similar in gas turbine, but rely on
Orifice plate quickly turbulent flow caused by movement be rapid decay there are the turbulent flows of single mainstream, pass through the movement for changing orifice plate
Speed realizes that the variation of turbulence intensity, the turbulence intensity that this experimental provision is built depend greatly on orifice plate speed.
Turbulence intensity is rapid decay, can not carry out the experimental work under isotropic turbulence environment, it is also difficult to be simulated increasingly complex
Turbulent environment in combustion experiment.
To sum up, the existing experimental provision that fuel combustion process in turbulent environment is studied, either bunsen burner, also
It is the CONSTANT VOLUME MODEL COMBUSTION CHAMBER that orifice plate quickly moves, essence is all region of turbulent wake, cannot achieve complicated turbulent flowing and is used for mould
Intend all kinds of true burning situations, while the turbulence intensity of this turbulent flow can be controlled again.
Invention content
In view of the foregoing, it is an object to provide a kind of constant volume burning experimental provision and the combustion experiment including it
System and method for simulating all kinds of true burning situations, while can control this turbulent flow again to realize that complicated turbulent is flowed
The turbulence intensity of flowing.
To achieve the goals above, it is an aspect of the invention to provide a kind of constant volume burning experimental provision, including cavity,
Ignitor, motor, frequency converter, control unit and the more desk fan leaf devices being installed on the cavity,
Wherein, the cavity is for providing confined space, and the ignitor is installed in the cavity, the ignition power
The center of pole discharge tip is located at the center of the cavity, for lighting the gas in the cavity, is all connected with per desk fan leaf device
One frequency converter and a motor, described control unit are connect with the ignitor and each frequency converter, by each frequency converter
Instruction is sent, the rotating speed of corresponding motor is controlled, it is rapid to be formed in the cavity to drive corresponding flabellum device to rotate
Flow flow field.
Preferably, the constant volume burning experimental provision further includes magnetic coupling, and the magnetic coupling is connected by magnetic force
Connect the flabellum device and the motor.
Preferably, the structure of more desk fan leaf devices is identical, is in center on the cavity centered on the center of the cavity
The form of symmetrical structure is arranged.
To achieve the goals above, another aspect of the present invention is to provide a kind of constant volume burning experimental system, including：
Constant volume burning experimental provision as described above；
Vacuum pump is connect with the cavity, for the gas in cavity to be discharged, establishes vacuum environment in the cavity；
Air inlet system and exhaust system are connect with the cavity, for each component of target gaseous mixture to be injected institute according to required amount
It states in cavity；And
Auxiliary test unit is connect with cavity, for the combustion characteristics in test flame communication process；
Wherein, described control unit is connect with the ignitor and the auxiliary test unit, by control unit to
The ignitor and the auxiliary test unit send instruction, obtain premixed flame under the turbulent environment that cavity is formed and are propagated through
Combustion characteristics in journey.
Preferably, the constant volume burning experimental system further includes heating device, is installed on the cavity, the heating dress
It sets for the target gaseous mixture to be heated to experiment target temperature.
Preferably, further include optical window, be mounted on the cavity, installation of the optical window on the cavity
Installation site of the position not with the flabellum device interferes.
To achieve the goals above, another aspect of the invention is to provide a kind of constant volume burning experimental method, using such as
The upper constant volume burning experimental system carries out target turbulence premixed combustion experiment, includes the following steps：
S1 calibrates the velocity of rotation of flabellum device and the correspondence of rotation direction and turbulence intensity；
The gas in cavity is discharged by vacuum pump by S2, establishes vacuum environment；
S3 is injected according to required amount in the cavity by air inlet system and exhaust system, by each component gas of target gaseous mixture；
S4 is sent to frequency converter by control unit and is instructed according to target turbulence intensity, and the velocity of rotation of flabellum device is controlled
And rotation direction, target turbulence environment is formed in the cavity；
After target turbulence ambient stable described in S5, referred to ignitor and auxiliary test unit transmission by control unit
It enables, lights target gaseous mixture, and obtain the combustion characteristics in the premixed flame communication process under the target turbulence environment.
Preferably, in step s 4, described control unit to more frequency converters by sending same instructions so that more electricity
Machine rotates, and more desk fan leaf devices is driven to be rotated synchronously according to the same direction with same rotational speed, to form dereliction in the cavity
Isotropic Turbulent Flow Field of stream.
Preferably, in step s 4, described control unit to a frequency converter by sending instruction so that a motor list
Solely rotation drives the flabellum device rotation being connect with the motor, other flabellum devices do not rotate, to be formed in the cavity
The Turbulent Flow Field of single mainstream.
Preferably, in step s 4, described control unit sends different fingers by two or more into more frequency converters
It enables so that an at least difference in the rotation direction and velocity of rotation of the flabellum device rotated in more desk fan leaf devices, in institute
It states and forms anisotropic Turbulent Flow Field in cavity.
Compared with prior art, the present invention has the following advantages and beneficial effect：
The present invention controls the rotation direction and velocity of rotation of more desk fan leaf devices by control unit respectively, in the cavity shape
It at various types of turbulent environments, can be used for simulating all kinds of true combustion processes, while the turbulent environment of formation can be controlled again
Turbulence intensity.
The present invention utilizes the various types of turbulent environments formed in cavity, studies in all kinds of complicated turbulent flowing environments
In combustion process, can get each combustion characteristics in premixed flame communication process under target turbulence environment, be conducive to according to stream
The difference in rotating ring border controls and optimizes combustion process, improves the dynamic property and fuel economy of thermal energy and power-equipment, to
Control the generation and discharge of burning pollutant, energy saving, environmental protection.
Description of the drawings
Fig. 1 is the structural schematic diagram according to the constant volume burning experimental provision of a preferred embodiment of the present invention；
Fig. 2 is the enlarged drawing of part A in Fig. 1；
Fig. 3 is the constant volume burning experimental system schematic diagram according to a preferred embodiment of the present invention；
Fig. 4 is the constant volume burning experimental method flow diagram according to a preferred embodiment of the present invention；
Fig. 5 is according to the turbulence intensity and flabellum device under the isotropic turbulence environment of a preferred embodiment of the present invention
The schematic diagram of relationship between rotational characteristic.
Specific implementation mode
Embodiment of the present invention described below with reference to the accompanying drawings.Those skilled in the art may recognize that
It arrives, it without departing from the spirit and scope of the present invention, can be with a variety of different modes or combinations thereof to described
Embodiment is modified.Therefore, attached drawing and description are regarded as illustrative in nature, rather than the protection for limiting claim
Range.In addition, in the present specification, attached drawing is drawn not in scale, and identical reference numeral indicates identical part.
The present embodiment is described in detail with reference to Fig. 1-Fig. 5.
Fig. 1 is according to the structural schematic diagram of the constant volume burning experimental provision of a preferred embodiment of the present invention, such as Fig. 1 institutes
Show, constant volume burning experimental provision of the present invention, including cavity 1, ignitor 6, motor 3, frequency converter 4, control unit 7 and
The more desk fan leaf devices 2 being installed on cavity 1.Wherein, for providing confined space, ignitor 6 is installed in cavity 1 cavity 1,
The center of the discharge tip of ignitor 6 is located at the center of cavity 1, for lighting the gas in cavity 1, per desk fan leaf device 2
One frequency converter 4 of connection and a motor 3, control unit 7 are connect with ignitor 6 and each frequency converter 4, by each frequency converter
4 send instruction, the rotating speed for the corresponding motor 3 that control connect with frequency converter 4, thus drive connected to the motor 3 it is corresponding
Flabellum device 2 rotate, to form Turbulent Flow Field in the cavity 1.
Since every desk fan leaf device 2 is all connected with a frequency converter 4 and a motor 3, every is controlled respectively by control unit 7
The rotation of flabellum device 2 so that various types of turbulent environments can be formed in cavity 1, can be used for simulating all kinds of true burnings
Process, meanwhile, the rotational characteristic of every desk fan leaf device 2 is controlled by control unit 7, and the turbulent flow of the turbulent environment formed can be controlled
Intensity, so as to for carrying out the combustion experiment in complicated turbulent environment.
Preferably, symmetrical structure centered on the structure of cavity 1 can eliminate space structure to combustion pressure in combustion process
Irreflexive influence ensures that the release of pressure and heat generally keeps uniformity in space, to subtract in combustion
Intermediate factor variation is lacked to the interference in research contents；Meanwhile centrosymmetric structure is conducive to building for homogeneous turbulence flow field
Vertical, the data of the collected pressure and temperature in any position may be incorporated for the quick-fried of research fuel near 1 internal face of cavity
Fried and exothermic character.For example, the structure of cavity 1 can be spherical shape, the inside diameter of spherical cavity 1 is preferably 380 millimeters (mm).
There is " eye of wind " in generated eddy flow when being rotated in order to avoid flabellum device 2, flabellum device 2 uses the form of axis stream,
That is axial flow fan leaf device.In a preferred embodiment, axial flow fan leaf device 2 uses the circumferential axis stream flabellum device of five blade of cast iron system
2, outer diameter 90mm, width of blade 15mm overlap 0 ° of angle.
In order to ensure that each flabellum device 2 can when structure is rotated with same rotational speed and the same direction under the same conditions
Isotropic homogeneous turbulence is formed in center position, it is preferable that the structure of more desk fan leaf devices 2 is identical, with the center of cavity 1
Centered on, the form for the structure that is centrosymmetric on cavity 1 is arranged.Preferably, flabellum device 2 has four, and four desk fan leaf devices 2 are pacified
It loaded on cavity 1, is arranged in the form of positive triangular pyramid in cavity 1, and the center of positive triangular pyramid is mutually be overlapped with the center of cavity 1
It closes, the Turbulent Flow Field of formation is region and is no longer that place is put at center in order.Positive trigone wimble structure is built using four number of units, is
Because positive trigone wimble structure is the minimum centrosymmetric structure of required endpoint, mounting hole few as possible can be opened on cavity 1, with
The safety in combustion experimental device structural strength is utmostly ensured under conditions of guaranteeing construction target turbulence environment,
Reduce the damage to 1 space structure of cavity.
Motor 3 is preferably electric rotary machine, is installed on except cavity 1, is connect with frequency converter 4.Wherein, the work of frequency converter 4
Depending on the turbulence intensity in the flow field that working frequency is built as needed, specific restriction is had no in the present invention.It is controlled and is revolved by frequency converter 4
Rotating motor 3 rotates rotary speed and the direction of rotation of terminal, and the rotation of the axial flow fan leaf device 2 in cavity 1 is moved by rotation terminal band
Turn, to form turbulent flow in cavity 1.The number of units of frequency converter 4 is corresponded with the number of units of electric rotating machine 3, so as to every
Platform electric rotating machine 3 is independently controlled.Correspondingly, the number of units of electric rotating machine 3 and the number of units of axial flow fan leaf device 2 correspond, with
Just every axial flow fan leaf device 2 is independently controlled, to form various types of Turbulent Flow Fields in cavity 1.
Control unit 7 is connect with each frequency converter 4, is instructed by being sent to each frequency converter 4, to be controlled by controlling motor 3
The rotation for making corresponding flabellum device 2 can form following three kinds of Turbulent Flow Fields in cavity 1：
Control unit 7 to a frequency converter 4 by sending instruction so that a motor 3 individually rotates, and drives and the motor
The flabellum device 2 of 3 connections rotates, other flabellum devices 2 do not rotate, to be formed with the Turbulent Flow Field of single mainstream in cavity 1；
Alternatively, control unit 7 to more frequency converters 4 by sending same instructions so that multiple electric motors 3 rotate, and drive more
Desk fan leaf device 2 is rotated synchronously with same rotational speed according to the same direction, to form isotropic rapids without mainstream in cavity 1
Flow flow field；
Alternatively, control unit 7 sends different instruction by two or more into more frequency converters 4 so that more desk fan leaves
An at least difference in the rotation direction and velocity of rotation of the flabellum device 2 rotated in device 2, to formed in the cavity 1 it is each to
Anisotropic Turbulent Flow Field.
Control unit 7 is also connect with ignitor 6, and control unit 7 can send trigger signal to ignitor 6, with point
Fire the gas in cavity.Side formula Integrated electrode may be used in ignitor 6, can also use two opposed ignitors 6.
No matter which kind of electrode approach is used, require that the center of 6 discharge tip of ignitor is located at the center of cavity 1, to realize
The igniting of center position.When more desk fan leaf devices 2 are centrosymmetric structure type arrangement, in 6 discharge tip of ignitor
The heart is overlapped with the center of cavity 1 and the center of more desk fan leaf devices 2.
Preferably, the constant volume burning experimental provision further includes magnetic coupling 5, and magnetic coupling 5 is preferably attached to fan
Vertical direction of the leaf device 2 outside the installation end on cavity 1, passes through magnetic connection flabellum device 2 and motor 3.In order to coordinate magnetic force to join
The magnetic force of axis device 5 is coupled, and the material of flabellum device 2 is magnetic conductive material.Fig. 2 is the enlarged drawing of part A in Fig. 1, as shown in Fig. 2,
Using magnetic coupling 5, the outer magnet 51 of magnetic coupling is connected with motor 3, inner magnet 52 and the flabellum device 2 of magnetic coupling
It is connected so that be not in contact formula connection when being driven between flabellum device 2 and motor 3, pass through outer magnet 51 and inner magnet
Magnetic Jie 53 arranged between 52 occurs magnetic force and is coupled, and the leakproofness of cavity 1 can be ensured, so as in the CONSTANT VOLUME MODEL COMBUSTION CHAMBER
The upper turbulent combustion carried out under varying environment pressure (including high back pressure and negative pressure) tests and with the fuel for poisoning property
Turbulent combustion is tested, simultaneously as the problem of pressure leakages are not present in combustion process in cavity 1, can acquire and study quick-fried
The relevant information of fried pressure and blast wave.
Another invention of the present invention is to provide a kind of constant volume burning experimental system, and Fig. 3 is excellent according to of the invention one
The constant volume burning experimental system schematic diagram of embodiment is selected, as shown in figure 3, constant volume burning experimental system of the present invention includes：On
Constant volume burning experimental provision, vacuum pump 8, air inlet system and exhaust system 9 and the auxiliary test unit stated.Wherein, vacuum pump 8 and cavity 1
Connection establishes vacuum environment, cavity 1, which is used as offer premix fuel, to carry out for being discharged the gas in cavity 1 in cavity 1
The enclosure space for mixing, lighting and burning；Air inlet system and exhaust system 9 are connect with cavity 1, for pressing each component of target gaseous mixture
According in required amount injection cavity 1；Auxiliary test unit is connect with cavity 1, special for the burning in test flame communication process
Property.Ignitor 6 and auxiliary test unit are connect with control unit 7, and control unit 7 not only controls frequency converter 4, also control point
The triggering of thermoelectricity pole 6 and auxiliary test unit sends instruction to ignitor 6 and auxiliary test unit by control unit 7, obtains
Take the combustion characteristics in premixed flame communication process under the turbulent environment of the formation of cavity 1.
Since constant volume burning experimental provision can form various types of Turbulent Flow Fields in cavity 1, different rapidss is built
Therefore stream environment using above-mentioned constant volume burning experimental system when carrying out Premixed Turbulent Combustion, may be implemented isotropic
In turbulent environment premixed combustion experiment, can also realize there are in the turbulent environment of single mainstream premixed combustion experiment,
It can also realize the premixed combustion experiment in the anisotropic turbulent environment of various complexity.Meanwhile in various turbulent environments
Turbulence characteristic can be convenient and accurately control.
Preferably, the constant volume burning experimental system further includes heating device, is installed on cavity 1, heating device is used for
Target gaseous mixture is heated to experiment target temperature.Wherein, experiment target temperature according to the needs of actual experiment into
Row setting, specific restriction is had no in of the invention to the heating temperature range of heating device, depends on the power of heating device.This hair
It is illustrated so that heating device is the heating rod being installed on cavity 1 as an example in bright, according to the needs of actual experiment, if in room temperature
Lower carry out related experiment is then not necessarily to start heating device.
Preferably, auxiliary test unit includes one kind of pressure test device, temperature testing device and optical testing device
Or it is a variety of.Wherein, pressure test device is the pressure sensor being installed on cavity 1, and temperature testing device is to be installed on cavity 1
On temperature sensor, optical testing device is for observing the flowing in 1 space of cavity and the process of flame propagation.According to reality
The difference of the optical testing technology used in the experimentation of border installs the optical window 10 of different number, and optics on cavity 1
Form 10 must not be interfered in the installation site on cavity 1 with the installation site of flabellum device 2.For example, using holographic shooting skill
When art or laser fluorescence induction measuring technology, need that six optical windows 10 are installed on cavity 1；Using schelieren technology
When, it needs that four optical windows 10 are installed on cavity 1；When using shadow testing technology, need that two light are installed on cavity 1
Learn form 10；When using pressure wave measuring technology, then optical window 10 is not necessarily to.In order to make the same cavity 1 be suitable for not sharing the same light
Six optical window mounting holes are reserved in the application for learning measuring technology on cavity 1.According to the optic test means of selection, if peace
The optical window 10 of dress is less than six, then installation substitutes flange at remaining optical window mounting hole.Six are installed on cavity 1
When optical window 10, six optical windows 10 orthogonal thereto mode on cavity 1 is distributed, and in orthogonal center and cavity 1
Heart position coincides, to realize the capture to the maximum magnitude of combustion flame profile.In a preferred embodiment, optics regards
A diameter of 110mm of window 10.
In a preferred embodiment, control unit 7 be used for control frequency converter 4, ignitor 6 triggering and other
Auxiliary signal, wherein other described auxiliary signals include but not limited to the opening and closing of air inlet system and exhaust system 9, optic test
The setting and triggering of device, the setting of pressure test device and triggering, the setting of temperature testing device and triggering, heating device
Setting etc..
In a preferred embodiment, multiple mounting holes, including multiple optical window mounting holes are opened up on cavity 1,
Remaining mounting hole is used to connect air inlet system and exhaust system 9, pressure sensor, temperature sensor, heating rod, safety valve etc. and cavity 1, and
Installation site of the position of mounting hole not with flabellum device 2 and optical window 10 interferes.Wherein, for connecting air inlet system and exhaust system
9, the mounting hole of pressure sensor, temperature sensor, heating rod etc. and cavity 1 can be opened in some or certain several optics and regard
On the replacement flange of window 10；And on cavity 1 must there are at least one mounting holes, for installing safety valve, to ensure turbulent flow
Quickly discharge accident uses CONSTANT VOLUME MODEL COMBUSTION CHAMBER in use.And when six optical window mounting holes are mounted on optical window 10
When, more connectors can be also installed at the mounting hole on cavity 1, to facilitate connection safety valve and air inlet system and exhaust system 9.
It should be noted that the present invention for the size of cavity 1, specified turn of the structure snd size of flabellum device 2, motor 3
Speed and power, the working range of frequency converter 4, the size of magnetic coupling 5, the structure snd size of ignitor 6, optical window 10
Size, the quantity of mounting hole and specific location and control unit 7 extension sexual function, limited without specific, can basis
Real work needs to carry out different designs and adjustment.
Another aspect of the invention provides a kind of constant volume burning experimental method, and Fig. 4 is preferred according to of the invention one
The constant volume burning experimental method flow diagram of embodiment, as shown in figure 4, using constant volume burning experimental system as described above into
Row target turbulence premixed combustion is tested, and is included the following steps：
S1 calibrates the velocity of rotation of flabellum device 2 and the correspondence of rotation direction and turbulence intensity；
The gas in cavity 1 is discharged by vacuum pump 8 by S2, establishes vacuum environment；
S3 is by air inlet system and exhaust system 9, by each component of target gaseous mixture according in required amount injection cavity 1；
S4 is sent to frequency converter 4 by control unit 7 and is instructed according to target turbulence intensity, the rotation speed of control flabellum device 2
Degree and rotation direction form target turbulence environment in cavity 1；
After S5 target turbulence ambient stables, referred to ignitor 6 and auxiliary test unit transmission by control unit 7
It enables, lights target gaseous mixture, and obtain the combustion characteristics in the premixed flame communication process under target turbulence environment.
Preferably, further include step S3a between step S3 and step S4, start heating device, target gaseous mixture is added
Heat arrives experiment target temperature.According to the needs of actual experiment, if carrying out Related Experimental Study at normal temperatures, without carrying out
Step S3a.
In step s 4, different instructions is sent to frequency converter 4 by control unit 7, can be formed in the cavity various
Complicated target turbulence environment.For example, control unit to more frequency converters by sending same instructions so that multiple electric motors turn
It is dynamic, drive more desk fan leaf devices to be rotated synchronously according to the same direction with same rotational speed, to formed in the cavity no mainstream it is each to
The Turbulent Flow Field of the same sex；Control unit to a frequency converter by sending instruction so that a motor individually rotates, and drives and electricity
The flabellum device rotation of machine connection, other flabellum devices do not rotate, to be formed with the Turbulent Flow Field of single mainstream in the cavity；Control
Unit sends different instruction by two or more into more frequency converters so that the flabellum device rotated in more desk fan leaf devices turns
An at least difference in dynamic direction and velocity of rotation, to form anisotropic Turbulent Flow Field in the cavity.
The present invention is better described with reference to embodiment 1-3 and carries out target turbulence premix using constant volume burning experimental system
The method flow of combustion experiment.
It should be noted that in embodiment 1-3, by taking following constant volume burning experimental system as an example, and it is without being limited thereto.Constant volume
Combustion experimental system includes：Spherical cavity 1 is opened up with the layout of positive triangular pyramid there are four mounting hole on the wall surface of the cavity 1,
And the positive triangular pyramid being made of four mounting holes center and the center of spherical cavity 1 coincide；It is installed on four
Four axial flow fan leaf devices 2 at a position of mounting hole；Four electric rotating machines 3, are installed on outside spherical cavity 1, are respectively used to drive
Four corresponding desk fan leaf devices 2；Four frequency converters 4 are used for the work of four electric rotating machines 3 of independent control；Four magnetic force shaft couplings
Device 5, is installed on except spherical cavity 1 and closely four axial flow fan leaf devices 2；Six optical windows 10 are installed in the form of orthogonal
In on spherical cavity 1；The form of one group of ignitor 6, face-off is installed on spherical cavity 1, and two interelectrode centers
The center of the positive triangular pyramid built with spherical cavity 1 and four axial flow fan leaf devices 2 coincides；Auxiliary test unit, including
Pressure sensor, temperature sensor and high-speed motion picture camera 11；Multiple mounting holes are opened on spherical cavity 1, for connecting into row
Gas system 9 and pressure sensor, temperature sensor etc. and spherical cavity 1；Control unit 7 realizes four frequency converters 4, ignition powers
The Comprehensive Control of pole 6 and auxiliary test unit；And vacuum pump 8.
Embodiment 1：
Fig. 5 is according to the turbulence intensity and flabellum device under the isotropic turbulence environment of a preferred embodiment of the present invention
The schematic diagram of relationship between 2 rotational characteristics, as shown in figure 5, the flame propagation in carrying out isotropic turbulence environment tests it
Before, calibrate in advance axial flow fan leaf device 2 rotating speed n (unit be rev/min, r/min) and rotation direction and turbulence intensity (with
Fluctuation velocity root mean square u ' rms indicate that unit is meter per second, m/s) correspondence, to carry out Premixed Turbulent Combustion experiment
When, according to target turbulence intensity, the velocity of rotation and rotation direction of control shaft stream flabellum device 2, in spherical cavity 1
Heart district domain forms expected isotropic turbulence environment.
It is first sharp after the velocity of rotation and the correspondence of rotation direction and turbulence intensity that calibrate axial flow fan leaf device 2
The gas in spherical cavity 1 is discharged with vacuum pump 8, vacuum environment is established in spherical cavity 1.Pass through Dalton's law (of partial pressures)
Or Armagh lattice partial volume law, each component experimental gas of target gaseous mixture is noted by air inlet system and exhaust system 9 according to required amount
Enter in spherical cavity 1, injection rate by the pressure gauge that is installed on spherical cavity 1 or can be installed in air inlet system and exhaust system 9 each
The flowmeter of gas branch road is monitored.
After the completion of waiting for the target gaseous mixture configuration in spherical cavity 1, pass through heating of the control unit 7 on spherical cavity 1
Device sends instruction, starts heating device and the target gaseous mixture in spherical cavity 1 is heated to experiment target temperature, example
Such as, 500K can be heated to.When the initial thermodynamic parameter of the target gaseous mixture in spherical cavity 1 reaches target, according to mesh
Turbulence intensity is marked, same instructions are sent to four frequency converters 4 by control unit 7, enable four electric rotating machines 3 with identical rotating speed
Start to rotate according to identical direction, by magnetic coupling 5, four axial flow fan leaf devices 2 of transmission are with identical rotating speed according to phase
Same direction starts to rotate.The rotation of every axial flow fan leaf device 2 will form a branch of forward eddy flow, when the eddy flow of four direction exists
It crosses at the center (while being also the center of the positive triangular pyramid constructed by four axial flow fan leaf devices 2) of spherical cavity 1
It, will be expected each in being formed in positive triangular pyramid inscribed sphere (one third of 1 inscribe bulb diameter of a diameter of spherical cavity) when collision
To the Turbulent Flow Field of the same sex.
After axial flow fan leaf device 2 persistently rotates 1 minute, the isotropic turbulence environment of center position is up to " stabilization "
State.It is sent out at this point, being synchronized to ignitor 6, pressure sensor, temperature sensor and high-speed motion picture camera 11 by control unit 7
Send trigger signal, the lighting of synchronous implementation goal gaseous mixture, the acquisition of pressure change and temperature change and fire in spherical cavity 1
The shooting of flame image, to obtain each combustion characteristics in the premixed flame communication process under target turbulence environment.
Embodiment 2：
Before flame propagation experiment in the turbulent environment for have single mainstream, axial flow fan leaf device 2 is calibrated in advance
Velocity of rotation and rotation direction and turbulence intensity correspondence, so as to when carrying out Premixed Turbulent Combustion experiment, according to
Target turbulence intensity, the velocity of rotation and rotation direction of control shaft stream flabellum device 2, in the central area of spherical cavity 1
There is the turbulent environment of single mainstream expected from formation.
It is first sharp after the velocity of rotation and the correspondence of rotation direction and turbulence intensity that calibrate axial flow fan leaf device 2
The gas in spherical cavity 1 is discharged with vacuum pump 8, vacuum environment is established in spherical cavity 1.Pass through Dalton's law (of partial pressures)
Or Armagh lattice partial volume law, each component experimental gas of target gaseous mixture is noted by air inlet system and exhaust system 9 according to required amount
Enter in spherical cavity 1, injection rate by the pressure gauge that is installed on spherical cavity 1 or can be installed in air inlet system and exhaust system 9 each
The flowmeter of gas branch road is monitored.
After the completion of waiting for the target gaseous mixture configuration in spherical cavity 1, pass through heating of the control unit 7 on spherical cavity 1
Device sends instruction, starts heating device and the target gaseous mixture in spherical cavity 1 is heated to experiment target temperature, example
Such as, 500K can be heated to.When the initial thermodynamic parameter of the target gaseous mixture in spherical cavity 1 reaches target, according to mesh
Mark turbulence intensity, instruction sent to frequency converter 4 by control unit 7, enable an electric rotating machine 3 individually rotation and other three
Platform electric rotating machine 3 does not work, and by magnetic coupling 5, is driven the axial flow fan leaf device 2 being connect with the electric rotating machine 3 of rotation and starts
Rotation, to be upwardly formed the expected Turbulent Flow Field for having single mainstream along the Vertical Square of the axial flow fan leaf device 2 of the rotation.
After axial flow fan leaf device 2 persistently rotates 1 minute, the turbulent environment with single mainstream is up to " steady in spherical cavity 1
State calmly ".At this point, being synchronized to ignitor 6, pressure sensor, temperature sensor and high-speed motion picture camera by control unit 7
11 send trigger signals, the lighting of synchronous implementation goal gaseous mixture, in spherical cavity 1 pressure change and temperature change acquisition with
And the shooting of flame image, to obtain each combustion characteristics in the premixed flame communication process under target turbulence environment.
Embodiment 3：
Before the flame propagation experiment in carrying out anisotropic turbulent environment, axial flow fan leaf device 2 is calibrated in advance
The correspondence of velocity of rotation and rotation direction and turbulence intensity, so as to when carrying out Premixed Turbulent Combustion experiment, according to mesh
Mark turbulence intensity, the velocity of rotation and rotation direction of control shaft stream flabellum device 2, in the central area shape of spherical cavity 1
At expected anisotropic turbulent environment.
It is first sharp after the velocity of rotation and the correspondence of rotation direction and turbulence intensity that calibrate axial flow fan leaf device 2
The gas in spherical cavity 1 is discharged with vacuum pump 8, vacuum environment is established in spherical cavity 1.Pass through Dalton's law (of partial pressures)
Or Armagh lattice partial volume law, each component experimental gas of target gaseous mixture is noted by air inlet system and exhaust system 9 according to required amount
Enter in spherical cavity 1, injection rate by the pressure gauge that is installed on spherical cavity 1 or can be installed in air inlet system and exhaust system 9 each
The flowmeter of gas branch road is monitored.
After the completion of waiting for the target gaseous mixture configuration in spherical cavity 1, pass through heating of the control unit 7 on spherical cavity 1
Device sends instruction, starts heating device and the target gaseous mixture in spherical cavity 1 is heated to experiment target temperature, example
Such as, 500K can be heated to.When the initial thermodynamic parameter of the target gaseous mixture in spherical cavity 1 reaches target, according to mesh
Turbulence intensity is marked, different instruction is sent to four frequency converters 4 by control unit 7, enables four electric rotating machines 3 rotate, passes through magnetic
Power shaft coupling 5, four axial flow fan leaf devices 2 of transmission start to rotate with peculiar specified rotating speed and rotation direction respectively.Due to along four
The eddy flow to move ahead in 2 vertical direction of platform axial flow fan leaf device has different turbulence characteristics, therefore, in 1 centre bit of spherical cavity
The place of setting cross collision when generated turbulent flow will no longer isotropism, specific turbulence characteristics will be by four-way incoming specific features
Comprehensive function and determine, to form expected anisotropic turbulent environment in the central area of spherical cavity 1.
After axial flow fan leaf device 2 persistently rotates 1 minute, the anisotropic turbulence environment of center position is up to " stabilization "
State.It is sent out at this point, being synchronized to ignitor 6, pressure sensor, temperature sensor and high-speed motion picture camera 11 by control unit 7
Send trigger signal, the lighting of synchronous implementation goal gaseous mixture, the acquisition of pressure change and temperature change and fire in spherical cavity 1
The shooting of flame image, to obtain each combustion characteristics in the premixed flame communication process under target turbulence environment.
It should be noted that in the above examples 1-3, according to the needs of actual experiment, if it is carrying out at normal temperatures
Related experiment, the link in relation to heating can be saved, that is, wait for directly initiating after the completion of the configuration of the target gaseous mixture in spherical cavity 1
Target turbulence environment is built in the rotation of axial flow fan leaf device 2.Simultaneously, it should be noted that the control for turbulence intensity can not only lead to
Velocity of rotation and the rotation direction of control shaft stream flabellum device 2 are crossed to control, can also by change axial flow fan leaf device 2 structure and
Size to form different turbulence intensities to control, and is using various sizes of spherical cavity 1 and various sizes of axial flow fan leaf device 2
When, and axial flow fan leaf device 2 needed for implementing before lighting a fire continues rotational time and should be not limited to admittedly according to advance calibration result is determining
Definite value.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.Any modification made by all within the spirits and principles of the present invention,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of constant volume burning experimental provision, which is characterized in that including cavity, ignitor, motor, frequency converter, control unit
And more desk fan leaf devices on the cavity are installed on,
Wherein, the cavity is for providing confined space, and the ignitor is installed in the cavity, and the ignitor is put
The center at electric tip is located at the center of the cavity, and for lighting the gas in the cavity, one is all connected with per desk fan leaf device
Frequency converter and a motor, described control unit are connect with the ignitor and each frequency converter, by being sent to each frequency converter
Instruction, controls the rotating speed of corresponding motor, to drive corresponding flabellum device to rotate, to form turbulent flow in the cavity
.
2. constant volume burning experimental provision according to claim 1, which is characterized in that
The constant volume burning experimental provision further includes magnetic coupling, and the magnetic coupling passes through flabellum device described in magnetic connection
With the motor.
3. constant volume burning experimental provision according to claim 1, which is characterized in that the structure of more desk fan leaf devices is identical, with
Centered on the center of the cavity, the form for the structure that is centrosymmetric on the cavity is arranged.
4. a kind of constant volume burning experimental system, which is characterized in that including：
Constant volume burning experimental provision as claimed any one in claims 1 to 3；
Vacuum pump is connect with the cavity, for the gas in cavity to be discharged, establishes vacuum environment in the cavity；
Air inlet system and exhaust system are connect with the cavity, for each component of target gaseous mixture to be injected the chamber according to required amount
In vivo；And
Auxiliary test unit is connect with cavity, for the combustion characteristics in test flame communication process；
Wherein, described control unit is connect with the auxiliary test unit, by control unit to the ignitor and described
Auxiliary test unit sends instruction, obtains the combustion characteristics in premixed flame communication process under the turbulent environment that cavity is formed.
5. constant volume burning experimental system according to claim 4, which is characterized in that the constant volume burning experimental system is also wrapped
Heating device is included, is installed on the cavity, the heating device is for being heated to the target gaseous mixture to test expected mesh
Mark temperature.
6. constant volume burning experimental system according to claim 4, which is characterized in that further include optical window, be mounted on institute
It states on cavity, installation site of installation site of the optical window on the cavity not with the flabellum device interferes.
7. a kind of constant volume burning experimental method carries out target turbulence using constant volume burning experimental system as claimed in claim 4
Premixed combustion is tested, and is included the following steps：
S1 calibrates the velocity of rotation of flabellum device and the correspondence of rotation direction and turbulence intensity；
The gas in cavity is discharged by vacuum pump by S2, establishes vacuum environment；
S3 is injected according to required amount in the cavity by air inlet system and exhaust system, by each component gas of target gaseous mixture；
S4 is sent to frequency converter by control unit and is instructed according to target turbulence intensity, control flabellum device velocity of rotation and
Rotation direction forms target turbulence environment in the cavity；
After target turbulence ambient stable described in S5, instruction is sent to ignitor and auxiliary test unit by control unit,
Target gaseous mixture is lighted, and obtains the combustion characteristics in the premixed flame communication process under the target turbulence environment.
8. constant volume burning experimental method according to claim 7, which is characterized in that in step s 4, described control unit
By sending same instructions to more frequency converters so that multiple electric motors rotate, and drive more desk fan leaf devices with same rotational speed according to phase
Equidirectional synchronous rotation, to form isotropic Turbulent Flow Field of no mainstream in the cavity.
9. constant volume burning experimental method according to claim 7, which is characterized in that in step s 4, described control unit
By sending instruction to a frequency converter so that a motor individually rotates, and drives the flabellum device rotation being connect with the motor,
Other flabellum devices do not rotate, to be formed with the Turbulent Flow Field of single mainstream in the cavity.
10. constant volume burning experimental method according to claim 7, which is characterized in that in step s 4, described control unit
Different instruction is sent by two or more into more frequency converters so that the rotation side of the flabellum device rotated in more desk fan leaf devices
To different at least one in velocity of rotation, to form anisotropic Turbulent Flow Field in the cavity.
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