CN101464206B - Test device for turbulent flow gas-liquid blending flow field in transverse flow - Google Patents
Test device for turbulent flow gas-liquid blending flow field in transverse flow Download PDFInfo
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- CN101464206B CN101464206B CN200910020982XA CN200910020982A CN101464206B CN 101464206 B CN101464206 B CN 101464206B CN 200910020982X A CN200910020982X A CN 200910020982XA CN 200910020982 A CN200910020982 A CN 200910020982A CN 101464206 B CN101464206 B CN 101464206B
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Abstract
A device for testing a turbulent flow blending flow field in a crosscurrent comprises a blending test section communicated with a main airflow; an atomizing nozzle is arranged on the blending test section and communicated therewith; matt paint is uniformly applied onto the inner wall of the blending test section; a plurality of slits are formed on the lateral wall of the blending test section; a double pulse Nd:YAG laser is arranged on one side of the blending test section, and the slits are formed on the side; a CCD camera is arranged at the outlet of the blending test section; and the double pulse Nd:YAG laser and the CCD camera are connected with a computer through a PIV synchronous controller separately. The invention addresses the difficulties in filming the flow field of a rotating flow centrifugal nozzle in a limited passage during the process of atomizing blending in the cross flow, such as liquid accumulation on the inner wall, the influence of ambient light, the arrangement of the camera and frequent calibration due to the filming of different sections, and at last can obtain a clear blending particle picture, thereby obtaining the important information about the flow field, the velocity field, the distribution of vorticity and the like.
Description
Technical field
The invention belongs to the flow-field test device, be specifically related to a kind of can the acquisition perpendicular to turbulent flow gas-liquid blending flow field proving installation in the crossing current of main flow direction xsect forward spin flow rotarytype injector spraying blending flow field.
Background technology
Water atomization extensively is present in the various commercial Application, as steam turbine, and industrial dedusting, nuclear reactor step-down cooling, atomizing humidifying performance, burner hearth cooling, the blending of spraying in the water punching engine, the propulsion plant of liquid propellant cannon etc.The quality of aqueous vapor two-phase mixing is a wherein very important aspect.Because the aquifer yield of straight injection stream is big, required pressure is little, thereby these field inner nozzles adopt jet nozzle more.To so far, most researchs also concentrate on jet nozzle with above the crossing current blending, and research contents comprises broken (atomizing) mechanism of jet (water), moisture mixing effect, flow field Changing Pattern etc.Want that in the research of related content aspect experiment and the numerical value when ripe, some method and technological improvements that improve blending efficient also are suggested.Occurred atomizing types such as two-fluid spray nozzle, air atomizer spray nozzle in addition, its relevant atomizing blending process was also once furtherd investigate.But the selection of these several atomizing type nozzles is direct-injection type, and this no doubt has above-mentioned advantage, but compares with eddy flow swirl atomizer etc., and atomizing effect but is not fine.Eddy flow is centrifugal, and another advantage is exactly its flow and pressure correlation except just reaching the good atomizing effect near nozzle, is easy to regulate.Aerosolization is difficult to realize that swirl atomizer has greater advantages under the short situation of (as underwater engine) and blending required distance adding.But atomize in the crossing current research of blending process rarely has appearance to swirl atomizer, at present the experiment that also its blending process and flow field is not changed in the document and the data of numerical value aspect.For crossing current atomizing blending, the preferred arrangement of nozzle is the emphasis of studying always, but owing to lack related data and data, the layout of swirl atomizer is selected according to then almost being blank.
Under the physical condition, a lot of situation aqueous vapors atomizing blending are to finish in restricted clearance, and environment is High Temperature High Pressure, experimentize to measure to the swirl atomizer atomizing and with the crossing current blending flow field under this kind condition and hardly may.Use for reference the research thinking of jet nozzle, at first the variation of nozzle atomization mechanism under the cold condition and nearly spraying area blending flow field is experimentized to measure and propose and optimize the blending scheme, this has the important theory directive significance to the hot blending under the physical condition.
Simultaneously, because the singularity of eddy flow rotarytype injector atomizing blending makes the experimental system of present many measurement jet blending flow fields not to be suitable for.Mainly show as:
1, the swirl atomizer atomizing can produce liquid film in vias inner walls, influences PIV and takes.
2, during research jet straight atomization blending xsect flow field, generally be use gas instead, and when adopting rotarytype injector, this method is suitable.
Under the cold conditions spraying crossing current blending condition, the problem of utilizing optical device to take the flow field existence mainly comprises:
1, there is liquid film in the experimental section inwall, is unfavorable for passing of light.
2, the reflective influence of surround lighting and experimental section to test cross section, flow field.
3, be difficult to take perpendicular to xsect Flow Field Distribution on the cross-wind direction.
4, the shooting cross section is a lot, frequently regulate the position in camera system and measurement cross section, and the rower of going forward side by side is fixed.
So, in order to improve the moisture mixing degree, promote the raising of related industries plant efficiency, and deepen the dynamic (dynamical) understanding of aqueous vapor two-phase flow, design obtains the experiment table of eddy flow centrifugal atomizing nozzle atomization blending process in the cold conditions crossing current, study its mixing mechanism and propose and optimize the blending scheme, have important reality and theory significance.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of with respect to axial flow field, can obtain its xsect Flow Field Distribution, thereby solve the measurement of correlation technological difficulties that exist in the cold conditions blending experiment, can obtain turbulent flow gas-liquid blending flow field proving installation in the crossing current of clear xsect flow field and relevant blending data.
For achieving the above object, the technical solution used in the present invention is: comprise experiment frame and be arranged on the blending test section that is connected with primary air on the experiment frame, the blending test section is provided with coupled logical atomizer, evenly be coated with mute lac varnish on the inwall of blending test section, offer several seams on the sidewall of blending test section, a side that offers the bar seam on the blending test section is provided with dipulse Nd:YAG laser instrument, the outlet of blending test section is provided with the CCD camera, and said dipulse Nd:YAG laser instrument is connected with computing machine by the PIV isochronous controller respectively with the CCD camera.
Also be connected with other air-flow on the primary air of the present invention, the other gas circuit outlet of this side air-flow is fixed on the exit that is positioned at the blending test section on the experiment frame; Also be fixed with the windowpane of the front end that is positioned at the CCD camera on the experiment frame; Experiment frame is arranged on the guide rail by pulley, and the guide rail leading screw that is provided with handle and is connected with handle, and leading screw also is threaded with experiment frame.
The present invention takes in the polishing of blending channel side wall, and the rear end is taken, thereby obtains longshore current field varying cross-section distribution of particles image, thereby analyzes the way in whole flow field.
Adopt the swirl atomizer atomizing inevitably can produce inwall hydrops phenomenon in restricted access, this is for PIV (Particle Image Velocimetry), and particle size analyzer etc. utilize the equipment in optical instrument test flow field to bring difficulty.In order to solve this difficult point, the present invention adopts the method for cracking at channel side wall longshore current field direction, and the place of cracking has separated the continuous of liquid film, thereby PIV sheet light is passed.For minimizing is cracked to main influence on flow field, bar seam size should be as far as possible little; In the PIV shooting process, only open the cross section bar seam of surveying, shut other positions of cracking.
In order to solve of the influence of blending flow field surrounding environment light to taking pictures, the present invention utilizes mute lac varnish that light is had good assimilation effect, employing evenly is coated with the way of mute lac varnish in vias inner walls, has strengthened and has taken the light intensity contrast ratio in cross section, thereby made the PIV image that obtains more clear.
Be subjected to the influence of blending tail gas stream for fear of the camera lens that is arranged in the test section dead astern, the present invention sets up an other gas circuit and a scalable windowpane on the basis of blending master gas circuit, other gas circuit is arranged between blending passage rear and the camera, its outlet is vertically over against the blending tail gas stream, purpose is that tail gas stream is blown partially, the scalable windowpane is arranged in camera the place ahead, further reduces the influence that air-flow is taken camera.
In order to solve that the PIV system need demarcate again when taking varying cross-section and some problems of bringing, as the change of form size, the change of focal length etc. often bring unnecessary operation and waste of time to experiment.The present invention has designed the removable experimental stand of integral type, with handwheel accurately control survey face coordinate position and need not to regulate camera focus and mobile PIV system itself.The total system compact conformation is convenient to operation, thereby is saved time simultaneously.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention;
Fig. 2 is the structural representation that the present invention moves experiment table.
Fig. 3 is instantaneous xsect MIXING FLOW field pattern for the present invention takes, and wherein x is that the institute lateral section is apart from nozzle distance;
Fig. 4 a is that the instantaneous photographic images of gas-liquid blending, Fig. 4 b are the velocity flow field pattern of aftertreatment:
Embodiment
The present invention will be further described below in conjunction with example and accompanying drawing.
Referring to Fig. 1,2, the present invention includes experiment frame 12 and be arranged on the blending test section 3 that is connected with primary air 1 on the experiment frame 12, blending test section 3 is provided with coupled logical atomizer 4, evenly be coated with mute lac varnish on the inwall of blending test section 3, offer several seams 10 on the sidewall of blending test section 3, a side that offers bar seam 10 on blending test section 3 is provided with dipulse Nd:YAG laser instrument 7, the outlet of blending test section 3 is provided with CCD camera 9, and said dipulse Nd:YAG laser instrument 7 is connected with computing machine 5 by PIV (Particle ImageVelocimetry) isochronous controller 6 respectively with CCD camera 9.On primary air 1, also be connected with other air-flow 2, the other gas circuit outlet 8 of this side air-flow 2 is fixed on the exit that is positioned at blending test section 3 on the experiment frame 12, also be fixed with the windowpane 14 of the front end that is positioned at CCD camera 9 on the experiment frame 12, experiment frame 12 is arranged on the guide rail 13 by pulley, and the leading screw 15 that guide rail 13 is provided with handle 11 and is connected with handle 11, leading screw 15 also are threaded with experiment frame 12.
The example operating mode is:
Chamber, the experimental section side of being, long 1000mm, cross sectional dimensions 95 * 95mm, material are organic glass.Along on the passage side, have the finedraw of 17 long 95mm, wide 3mm.Nozzle is selected the KB series centrifugal atomizing nozzle of company in the pond of Japanese mist for use, and discharge is 22.6L/h under the 7bar pressure, atomizing Suo Taier diameter 104 μ m, 80 ° of atomizing angles.The crossing current Reynolds number is from 12900-45000.
Referring to Fig. 3,4, from experimental result, the blending particle picture is clear, and structural symmetry has illustrated and has cracked to the almost not influence of main flow field, has obtained important blending flow field information (velocity field, vorticity field).This experimental system can be tested different blending situations, as: nozzle placement angle, water-gas ratio, nozzle number etc., and then analyze of the influence of each parameter to the blending effect, thus distribute rationally, reach and serve application aims.
In sum, the present invention has realized the test target of expection, is suitable for the situation of the centrifugal spraying crossing current of eddy flow blending fully.
Claims (4)
1. turbulent flow gas-liquid blending flow field proving installation in the crossing current, comprise experiment frame (12) and be arranged on the blending test section (3) that is connected with primary air (1) on the experiment frame (12), blending test section (3) is provided with coupled logical atomizer (4), it is characterized in that: evenly be coated with sub-gloss varnish on the inwall of blending test section (3), offer several bar seams (10) on the sidewall of blending test section (3) perpendicular to flow field direction, a side that offers bar seam (10) on blending test section (3) is provided with dipulse Nd:YAG laser instrument (7), the outlet of blending test section (3) is provided with CCD camera (9), take in blending test section (3) sidewall polishing, the rear end is taken, thereby obtains longshore current field varying cross-section distribution of particles image and analyze whole flow field; Said dipulse Nd:YAG laser instrument (7) is connected with computing machine (5) by PIV isochronous controller (6) respectively with CCD camera (9), in the PIV shooting process, only opens the cross section bar seam of surveying, and shut other positions of cracking.
2. turbulent flow gas-liquid blending flow field proving installation in the crossing current according to claim 1, it is characterized in that: also be connected with other air-flow (2) on the said primary air (1), the other gas circuit outlet (8) of this side air-flow (2) is fixed on the exit that is positioned at blending test section (3) on the experiment frame (12).
3. turbulent flow gas-liquid blending flow field proving installation in the crossing current according to claim 1 and 2 is characterized in that: the windowpane (14) that also is fixed with the front end that is positioned at CCD camera (9) on the said experiment frame (12).
4. turbulent flow gas-liquid blending flow field proving installation in the crossing current according to claim 1, it is characterized in that: said experiment frame (12) is arranged on the guide rail (13) by pulley, and the leading screw (15) that guide rail (13) is provided with handle (11) and is connected with handle (11), leading screw (15) also are threaded with experiment frame (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910020982XA CN101464206B (en) | 2009-01-20 | 2009-01-20 | Test device for turbulent flow gas-liquid blending flow field in transverse flow |
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| CN200910020982XA CN101464206B (en) | 2009-01-20 | 2009-01-20 | Test device for turbulent flow gas-liquid blending flow field in transverse flow |
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| CN101464206A CN101464206A (en) | 2009-06-24 |
| CN101464206B true CN101464206B (en) | 2010-08-11 |
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