CN109781416A - It is clashed using reciprocating gas and builds the turbulent flow constant volume burning experimental provision for stablizing turbulent flow - Google Patents
It is clashed using reciprocating gas and builds the turbulent flow constant volume burning experimental provision for stablizing turbulent flow Download PDFInfo
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- CN109781416A CN109781416A CN201811609588.5A CN201811609588A CN109781416A CN 109781416 A CN109781416 A CN 109781416A CN 201811609588 A CN201811609588 A CN 201811609588A CN 109781416 A CN109781416 A CN 109781416A
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Abstract
The present invention provides a kind of constant volume burning experimental provision for building stable Turbulent Flow Field using reciprocating gas head-on collision, which includes: closed cavity, and inner cavity is spherical shape, for providing the enclosure space burnt；Reciprocating moving mechanism generates pulse pneumatic using continuous move back and forth；Pulsation source connecting hole, each pore size is identical and the axis in hole all passes through closed cavity center, each hole is constituted centrosymmetric polyhedral structure centered on cavity lumen centers, for guiding the pulse pneumatic of generation to cavity and generating turbulent flow using collision between the air-flow from different directions；High-speed response valve realizes the connection or cutting flowed between reciprocating moving mechanism and closed cavity；Electronic control system, for being independently controlled to each reciprocating moving mechanism and each high-speed response valve.The premixed combustion experimental study in isotropic turbulence can carried out using experimental provision provided by the invention.
Description
Technical field
The present invention designs a kind of turbulent flow constant volume burning experimental provision more particularly to a kind of reciprocating air-flow pulse pair of utilization is hit
Turbulent flow constant volume burning experimental provision.
Background technique
For power device (such as aero-engine, automobile engine, marine gas turbine, the special type using burning driving
Straight line internal combustion motor of equipment etc.) for, power performance is determined by combustion process.Burning in these physical devices
Process all occurs among turbulent environment, and the interaction between turbulent flow and flame directly determines the quality of burning, and in turn
Determine the power performance, fuel economy performance and burning and exhausting performance of these power devices.Therefore, carry out turbulent combustion process
Basic research with combustibility is most important for the optimization design of guidance burning driving power device and control.
For majority is with the power device for driving of burning, turbulent environment occurred of burning is mainly due in device
Caused by the movement of mechanical structure, the movement of this mechanical structure is shuttle stroke movement in most cases, therefore this
There are the pulsatile characteristics as brought by stroke movement in true Turbulent Flow Field in a little power devices.However, being presently available for
The experimental facilities for carrying out the research of turbulent combustion basic experiment all can not veritably simulate the rapids in this practical power-equipment
During stream flow field and turbulent combustion.Bunsen burner is the experiment dress being most widely used in current turbulent combustion experimental study
It sets, main more achievable simple stay of this experimental provision determines flame (such as candle flame, family's kitchen range flame) simulation,
Its obtainable result of study be difficult to obtain when applying in power device of the flame development as driving source to expand it is good at
Effect.Although also occurring that the fan turbulent flow CONSTANT VOLUME MODEL COMBUSTION CHAMBER of expansion flame movement may be implemented in recent years, its is stable
Initial turbulence flow field is the agitation by fan in experimental provision and formed, the rapids in Turbulent Flow Field and practical power device
It flows and there is very big difference in the origin cause of formation and characteristic: first, the flow field that this mode is formed is actually by fan rotary motion
What generated orderly eddy flow was constituted, and it is not Turbulent Flow Field truly caused by unordered flowing pulsation；Its
Two, this mode is formed by flow field because disturbing source is stable fan rotation, therefore the flowing in its flow field does not have arteries and veins
Rush feature.Although also some perspective research work pass through the power device (such as optical engine) for preparing in transparent material
Directly observe turbulent combustion process；But there is also two distinct issues for this kind of experimental provision: first, transparent material is (at present
It is main to use quartz glass) bearing capacity and temperature capability it is limited, can not simulate under the high-pressure high-temperature environment in power device
Combustion experiment；Second, its Turbulent Flow Field built does not have isotropism and there are unstable shapes during rapid decay
State obtains the condition that combustion process research does not have quantitative analysis in this Turbulent Flow Field, it is also difficult to be applied to Theory of Combustion
The theoretical direction of perfect, combustion model foundation and burner design and optimization.
To sum up, existing Combustion Simulation experimental provision, which cannot achieve, is applied to guidance with the power device for driving of burning
The basic research of interior turbulent combustion Process Design and control.
Summary of the invention
In view of the foregoing, it is an object to provide a kind of turbulent flow constant volume burning experimental provision, may be implemented steady
Fixed Turbulent Flow Field, while there are the features of pulse in the turbulent flow built.
To achieve the goals above, the stable turbulent flow of construction is hit using reciprocating air-flow pulse pair the present invention provides a kind of
The constant volume burning experimental provision of field, the device include:
Closed cavity, for providing the enclosure space of carrying Turbulent Flow Field and turbulent combustion process；The inner cavity of the cavity
It is designed as spherical structure, to avoid the uneven transmitting for causing pulsating wave between closed cavity；On the cavity, with cavity
It is orthogonal centered on center to open up six holes, one piece of visual optical window is installed on each mounting hole, is on the one hand used for chamber
Intracorporal sealing, on the other hand then in the optical path of offer observation combustion process；Meanwhile it being equipped on cavity for matching
It sets combustion experiment mixture and the distribution pipeline of exhaust gases after combustion is discharged, for realizing the igniting lighted a fire at chamber central position
Electrode, for measuring the sensing equipment of thermodynamic parameter and other Auxiliary Functioning Units in cavity；
Reciprocating moving mechanism, for generating the air-flow stream with pulsating wave in mechanism by continuous reciprocating
It is dynamic, and pass through the outlet in the mechanism and the export and sucking of air-flow may be implemented；
Pulsation source connecting hole is opened on closed cavity, has pulsating wave for generate reciprocating moving mechanism
Air-flow flowing guidance to closed cavity；Meanwhile the size of each pulsation source connecting hole is identical, each hole central axis all passes through envelope
The spherical inner chamber center of closed chamber body, by the center of all pulsation source connecting holes using closed cavity spherical inner chamber center as center structure
Polyhedral structure (such as positive triangular pyramid, square, regular octahedron, regular dodecahedron, regular dodecahedron) in a center of symmetry is used
In will from different directions, same-phase, air-flow with pulsating wave sends out in the spherical inner chamber center position of closed cavity
Raw collision is to form every turbulent flow with phase；
High-speed response valve is installed on and realizes between reciprocating moving mechanism and pulsation source connecting hole, for realizing reciprocal
The quick connection or cutting that air-flow flows between formula movement mechanism and closed cavity；
Electronic control system, for carrying out independent control to each reciprocating moving mechanism and each high-speed response valve
System, while comprehensively control can be carried out to ignitor, thermodynamic parameter sensing equipment and other miscellaneous function equipment.
Compared with prior art, the invention has the following advantages that reciprocating moving mechanism is formd by reciprocating
Air-flow flowing containing pulsating wave, is formed using the air-flow containing pulsating wave in the collision of spherical cavity center position unordered
And the Turbulent Flow Field containing pulsatile characteristics；It, will the company of having in spherical cavity when reciprocating moving mechanism is continuously quickly run
The continuous air-flow containing pulsating wave constantly collides, so as to form stable Turbulent Flow Field；By changing reciprocating moving mechanism
Reciprocating motion speed and the mechanism discharge capacity, flexibly and the turbulence intensity of spherical cavity center position can be accurately controlled.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, other of the invention
Characteristic, objects and advantages will become more apparent upon:
Fig. 1 is that of the invention clashed using reciprocating gas builds the constant volume burning experimental provision for stablizing Turbulent Flow Field
The formation schematic diagram of interior turbulent flow；
Fig. 2 is to be built to stablize Turbulent Flow Field using reciprocating gas head-on collision according to a preferred embodiment of the present invention
Constant volume burning experimental provision structural diagrams be intended to；
Fig. 3 is to be shown according to the system for carrying out the experiment of Premixed Turbulent Combustion constant volume of a preferred embodiment of the present invention
It is intended to.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings.Below with reference to
The embodiment of attached drawing description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Firstly, referring to FIG. 2, steady to being built using reciprocating gas head-on collision for a preferred embodiment of the present invention
The structure for determining the constant volume burning experimental provision of Turbulent Flow Field is specifically described.
Specifically, the constant volume burning experimental provision includes closed spherical cavity 1, distribution pipeline 2, thermodynamic parameter biography
Feel equipment and other miscellaneous function equipment 3, ignitor 4, pulsation source connecting hole 5, reciprocating moving mechanism 6, high-speed response
Valve 7, electronic control unit 8.
In the present embodiment, the closed spherical cavity 1, inside diameter 380mm are made of stainless steel material, can
Bear the high temperature and high pressure generated in combustion process impact.Burning due to using spherical structure, in internal achievable universe
Pressure uniformly transfers.
In the present embodiment, the distribution pipeline 2 is installed on the closed spherical cavity 1, by several diameter 14mm's
Stainless steel tube composition；Every stainless-steel pipe is responsible for the same vacuum equipment of the closed spherical cavity 1, high-pressure air source and high pressure
Connection and cutting between fuel gas gas source.
In the present embodiment, the thermodynamic parameter sensing equipment and other miscellaneous function equipment 3, are installed on the envelope
The spherical cavity 1 closed；It includes the equipment such as temperature sensor, pressure sensor, flow velocity test equipment, for described in real-time measurement
The various corresponding physical messages such as temperature, pressure, flow velocity of designated position in closed spherical cavity 1.
In the present embodiment, the ignitor 4 is installed on the closed spherical cavity 1；It is identical by two sizes
Nickel tungsten electrode composition, electrode diameter 2mm, the opposed installation of centering, the gap at two ignitor tips is 2mm, and two
The middle position of ignitor tip clearance is overlapped with the center of the closed spherical cavity 1, to realize in the envelope
It is formed by initial fiery core in the spherical cavity 1 closed to be centrosymmetric with the center of the closed spherical cavity 1, then
Combustion pressure wave is uniformly propagated in the closed spherical cavity 1.
In the present embodiment, the pulsation source connecting hole 5 is opened on the closed spherical cavity 1, opens up four altogether
The pulsation source connecting hole 5, each hole are designed to the round thread hole of diameter 14mm, and the axis in each hole passes through the envelope
The center of the spherical cavity 1 closed, and four pulsation source connecting holes 5 are using the center of the closed spherical cavity 1 as structure
Center construction Cheng Chengzheng triangular pyramid；Each hole will lead into the pulse pneumatic outside the closed spherical cavity 1 described
The pulse pneumatic of closed spherical cavity 1, four direction collides in the center position of the closed spherical cavity 1,
Form Turbulent Flow Field.
In the present embodiment, the reciprocating moving mechanism 6 is using single cylinder engine for motorcycle, every motorcycle hair
The cylinder cap of motivation is replaced with the blind flange that a center is provided with 14mm threaded hole；Four reciprocating moving mechanisms 6 and four
The pulsation source connecting hole 5 corresponds, and being generated in cylinder by piston-crank-link motion in engine cylinder has arteries and veins
The air-flow of dynamic feature, and transmitted outward by the hole on blind flange.When the motorcycle hair in four reciprocating moving mechanisms 6
When motivation is with identical revolving speed, same-phase operation, the turbulent flow formed on the center of the closed spherical cavity 1 will be
Isotropic turbulence.
In the present embodiment, the high-speed response valve 7 use operated pneumatic valve, totally four；One end of each operated pneumatic valve
Be installed on the closed spherical cavity 1 by the pulsation source connecting hole 5, the mode that the other end is connected through a screw thread with one
In the reciprocating moving mechanism 6 on the threaded hole of single cylinder engine for motorcycle cylinder head substitution blind flange；Pass through the quick of valve
It opens and closes, realization is connected by the air-flow with pulsatile characteristics that the reciprocating moving mechanism 6 generates by the pulsation source
Connect transmitting and cutting of the hole 5 to the closed spherical cavity 1.
In the present embodiment, the electronic control unit 8, for realizing the thermodynamic parameter sensing equipment and other
Miscellaneous function equipment 3, the ignitor 4, the reciprocating moving mechanism 6, the high-speed response valve 7 control signal
It is arranged and triggering and other scalability auxiliary signal (including but not limited to opening and closing of air inlet system and exhaust system, optic test
The setting and triggering of device, the setting of heating device etc.).
The size of above-mentioned closed spherical cavity 1, the quantity of distribution pipeline 2 and layout, thermodynamic parameter sensing equipment with
And the composition and measurement range of other miscellaneous function equipment 3, the form of ignitor 4 and ignition energy, pulsation source connecting hole 5
Shape with size and quantity, the motion mode of reciprocating moving mechanism 6 and movement velocity (or motion frequency) and quantity,
Type and quantity, the extension sexual function of electronic control unit 8 of high-speed response valve 7, can need basis according to real work
The selection of dimension range provided carries out different designs and adjustment, and this is no longer going to repeat them.
Fig. 3 show using Fig. 2 shows turbulent flow constant volume burning experimental provision experimental system schematic diagram, below in conjunction with
Experimental system shown in Fig. 3, using the Premixed Turbulent Combustion process experiment under isotropism initial turbulence as embodiment, to the present invention
The course of work of the turbulent flow constant volume burning experimental provision proposed is specifically described.
Before implementing the Premixed Turbulent Combustion experimental study in initial turbulence isotropism environment, it should need to calibrate in advance past
It is corresponding between the movement velocity of reciprocating mechanism 8, motion phase and closed 1 center position turbulence intensity of spherical cavity
Relationship.When carrying out target turbulence premixed combustion, according to target turbulence intensity needed for research, reciprocating moving mechanism 8 is controlled
Initial phase and movement velocity when middle piston motion, to be built in closed 1 center position of spherical cavity
Expected isotropism initial turbulence.
Specific implementation process first turns on the pipeline of the vacuum equipment 3 on distribution pipeline 2, will be closed using vacuum equipment
1 vacuum state of spherical cavity.The pipeline for closing vacuum equipment 3, it is seperated based on Dalton's law (of partial pressures) or Armagh lattice
Product law calculates the partial pressure volume fraction or mass component of each experimental gas in object of experiment.Open distribution pipeline 2
On experimental gas 4 gas circuit, import corresponding component gas to the closed spherical cavity 1, during distribution, utilize
Real-time measurement enters the partial pressure or mass flow of each experimental gas 4 in spherical cavity 1 in thermodynamic parameter sensing equipment 5, really
The amount for protecting each experimental gas entered in the closed spherical cavity 1 is accurate.After the completion of object of experiment gas configuration, closing is matched
Air pipe 2.By electronic control unit 6 to reciprocating moving mechanism control system 7 (be in the present embodiment to drive reciprocating fortune
The rotor electric machine of 8 single cylinder engine for motorcycle of motivation structure) synchronous Trig control signal is sent, so that four reciprocating movement mechanisms
Piston in 8 single cylinder engine for motorcycle cylinders from identical phase with identical movement velocity reciprocating.
Meanwhile triggering control is sent to the electromagnetic relay 9 that control high-speed response valve 10 opens and closes by electronic control unit 6
Signal is quickly opened with frequency so that four high-speed response valves 10 are synchronized, is generated in four reciprocating movement mechanisms 8 to enable
Enter the closed spherical cavity 1 via pulsation source connecting hole 11 with the pulse pneumatic of position with frequency.Connected by four pulsation sources
The air-flow containing pulsatile characteristics that hole 11 enters in closed spherical cavity 1 is connect to touch in the center of closed spherical cavity 1
It hits, forms isotropic initial turbulence.8 persistent movement of reciprocating moving mechanism is after one minute, closed 1 center of spherical cavity
The isotropic turbulence at place is up to the state of " stabilization "；At this point, passing through electronic control unit 6 to thermodynamic parameter sensing equipment
5 (including but not limited to pressure sensor, temperature sensor, velocity sensors etc.), electromagnetic relay 9, ignitor 12, optics
Test equipment 13 (including but not limited to high-speed camera) issues synchronous triggering signal, enables 10 quick closedown of high-speed response valve
Meanwhile ignitor 12 releases spark ignition experimental gas, and the turbulent flow in the closed spherical cavity 1 of synchronous recording premixes fire
The thermodynamic parameter information of specified location and flow rate information etc. in the process of flame formation and development, closed spherical cavity 1.
Particularly, pass through the initial position phase of change 8 single cylinder engine for motorcycle cylinder inner piston of reciprocating moving mechanism
And the control of turbulence intensity may be implemented in movement velocity, by changing 8 single cylinder engine for motorcycle cylinder of reciprocating moving mechanism
The control of turbulence intensity also may be implemented in interior discharge capacity, and which is not described herein again.According to the needs of actual experiment, if it is at high temperature
Carry out Related Experimental Study work, can install heating system additional in closed spherical cavity 1, in spherical cavity 1 to be closed
Temperature sends synchronous triggering control to reciprocating moving mechanism control system 7 by electronic control unit 6 again after reaching target temperature
Signal processed.Simultaneously, it should be noted that single in the reciprocating moving mechanism 8 using various sizes of closed spherical cavity 1, different displacements
When cylinder motorcycle starts, the time for implementing igniting 8 persistent movement of preceding required reciprocating moving mechanism should be according to preparatory calibration result
It determines and is not limited to some fixed value.
It is obvious to a person skilled in the art that the present invention is not limited to the details of above-mentioned example embodiment, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included in the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.This
Outside, it is clear that one word of " comprising " does not exclude other units or steps, and odd number is not excluded for plural number, and that states in system claims is multiple
Unit or device can also be realized by a unit or device by software or hardware.
Claims (7)
- The constant volume burning experimental provision for stablizing Turbulent Flow Field is built 1. hitting using reciprocating air-flow pulse pair, which includes:Closed cavity, offer on the cavity three pairs of omnidirectional distributions optical window and it is several for install distribution pipeline, The mounting hole of ignitor, thermodynamic parameter sensing equipment and other miscellaneous function equipment；Reciprocating moving mechanism is generated the air-flow with pulsating wave in its mechanism using its continuous reciprocating and flowed, And the export and sucking of air-flow may be implemented by the aperture in the mechanism；Pulsation source connecting hole, the air-flow flowing guidance with pulsating wave that reciprocating moving mechanism is generated to closed cavity, And turbulent flow is generated using the collision between the air-flow flowing with pulsating wave from different directions；High-speed response valve is installed on and realizes between reciprocating moving mechanism and pulsation source connecting hole, for realizing reciprocating fortune The quick connection or cutting that air-flow flows between motivation structure and closed cavity；Electronic control system, for being independently controlled to each reciprocating moving mechanism and each high-speed response valve, together When can to ignitor, thermodynamic parameter sensing equipment and other miscellaneous function equipment carry out comprehensively control.
- 2. constant volume burning experimental provision according to claim 1, wherein the inner cavity of the closed cavity is using spherical Structure.
- 3. constant volume burning experimental provision according to claim 1, wherein the reciprocating moving mechanism can use class It is similar to the structure of the piston-crank formula in IC engine cylinder, it can also be using the dead axle-pedal being similar in pedal air blower Structure, can also using similar to ear washing bulb volume-pressure linkage structure, but require reciprocating movement frequency Rate or movement velocity are highly controllable, while requiring front end with small-bore outlet and the end face exported and reciprocating structure institute The airflow direction of generation is perpendicular.
- 4. constant volume burning experimental provision according to claim 1, wherein the pulsation source connecting hole desired size is identical And the central axis of each intercommunicating pore will be by the center of closed cavity, while requiring the central point of each connecting hole with cavity ball Be built into centered on the center of shape inner cavity a centrosymmetric polyhedral structure (such as positive triangular pyramid, square, regular octahedron, Regular dodecahedron, regular dodecahedron etc.).
- 5. constant volume burning experimental provision according to claim 1, wherein the quick response valve can directly pass through It is threadedly coupled in outlet and pulsation source connecting hole with reciprocating moving mechanism, can also install and connect reciprocating moving mechanism On communicating pipe between pulsation source connecting hole；It can use electrically operated valve, can also use operated pneumatic valve, but necessarily require It is by electronically controlled high-speed response valve.
- 6. constant volume burning experimental provision according to any one of claim 1 to 5, when all reciprocating moving mechanisms are same When, synchronization, with frequency, synchronized movement, and when reciprocating moving mechanism is with access connection between closed cavity, from all directions Air-flow with pulsation will form isotropic turbulent flow at closed chamber central position.
- 7. constant volume burning experimental provision according to any one of claim 1 to 5, changes the discharge capacity of reciprocating moving mechanism It can change the turbulence intensity at closed cavity center with motion frequency or movement velocity.
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| CN201811609588.5A CN109781416A (en) | 2018-12-27 | 2018-12-27 | It is clashed using reciprocating gas and builds the turbulent flow constant volume burning experimental provision for stablizing turbulent flow |
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| CN201811609588.5A CN109781416A (en) | 2018-12-27 | 2018-12-27 | It is clashed using reciprocating gas and builds the turbulent flow constant volume burning experimental provision for stablizing turbulent flow |
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| CN108709749A (en) * | 2018-03-21 | 2018-10-26 | 天津大学 | Simulate the experimental system of turbulent flame and wall-film interaction |
| CN108982110A (en) * | 2018-06-11 | 2018-12-11 | 北京交通大学 | The constant volume experimental provision of injection and atomization process in a kind of analog isotropism and anisotropic field of turbulent flow |
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- 2018-12-27 CN CN201811609588.5A patent/CN109781416A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323390A (en) * | 2011-08-12 | 2012-01-18 | 北京理工大学 | Constant volume premixed combustion testing apparatus |
| US20130228976A1 (en) * | 2012-03-05 | 2013-09-05 | Ion Murgu | M Thermodynamic resonant engine with a rotary variant |
| CN104793006A (en) * | 2015-03-16 | 2015-07-22 | 清华大学 | Measuring system and method for laminar and turbulent flame speeds of fuel at high gas pressure |
| CN108562689A (en) * | 2018-01-04 | 2018-09-21 | 北京交通大学 | A kind of constant volume burning experimental provision and combustion experimental system and method including it |
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Application publication date: 20190521 |