CN102636420B - Device for measuring grain size of atomized droplet in large-size mist spray field - Google Patents

Device for measuring grain size of atomized droplet in large-size mist spray field Download PDF

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CN102636420B
CN102636420B CN201210128574.8A CN201210128574A CN102636420B CN 102636420 B CN102636420 B CN 102636420B CN 201210128574 A CN201210128574 A CN 201210128574A CN 102636420 B CN102636420 B CN 102636420B
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board
window
instrument
measuring
light
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CN102636420A (en
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苏光辉
兰治科
朱大欢
田文喜
秋穗正
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Xian Jiaotong University
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Xian Jiaotong University
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Abstract

The invention discloses a device for measuring the grain size of atomized droplet in a large-size mist spray field, comprising a measuring room, a background plate and a compensating light source; the measuring room is formed by the enclosing of side plates at two sides and a top plate, the front end and the back end of the measuring room are opened, the measuring room is divided into an instrument room and a mist spray room by a middle clapboard, and the instrument room is used for arranging a measuring instrument; a semi-sealed space is formed by the enclosing of the mist spray room and the background plate, and the droplet grain to be measured is separated from the other atomized grains; the compensating light source is arranged behind the background plate, and a window is arranged on the background plate which corresponds to a measuring region, so that the light ray of the compensating light source can conveniently penetrate through the window to compensate the light of the droplet within a region to be measured; and a region in which the droplet is measured is provided with scale stripes which can focus in an imaging way and can be used as size reference, and the scale stripes are fixed at two sides of the light compensating window by steel needles. The device is convenient in measurement, the distribution of the flow field can be completely described for a low-pressure drop and high-flow mist spray head, and when the grain size of the droplet is measured, larger error can not be generated.

Description

A kind of large-scale spray field atomization droplets diameter measurement mechanism
Technical field
The present invention relates to fog-spray nozzle design, atomization evaluation field, relate to the measurement of the large-scale spray field atomization droplets diameter that low pressure drop, large flow fog-spray nozzle are produced, especially a kind of large-scale spray field atomization droplets diameter measurement mechanism.
Background technology
In nuclear reactor operation and safe emergency system, there is a large amount of atomizing sprays and cooling system.Wherein system has been moved to vital voltage stabilizer, what use is exactly low pressure drop, large flow fog-spray nozzle.In the fog-spray nozzle design phase and according to requirements fog-spray nozzle is carried out in screening process, must to atomization droplets diameter, understand in detail by test.During conventional fog-spray nozzle atomizing particle particle diameter distribution measuring, conventionally select the equipment such as doppler phase instrument, laser particle analyzer.To the daily high pressure drop of using, the Minitype atomizing spray head of low discharge, this measuring method can meet test request.And to the low pressure drop using in voltage stabilizer, large flow fog-spray nozzle, spray field diameter can reach more than four meters, because spray area is wide, drop particle is large, use above classic method not only can not describe Flow Field Distribution situation completely, and when measuring size droplet diameter, easily produce larger error, even because exceeding measurement range, size droplet diameter make test carry out.
Patent CN200410053033.9 has described a kind of scan-type nozzle atomization field mist droplet particle size and concentration space Distribution Analyzer.This type instrument requires spray field in the middle of the U-shaped support of design, to pass, and the light beam sending from transmitting terminal front aperture is through whole flow field, and through receiving end front, aperture enters photelectric receiver.But to large flow field noted earlier fog-spray nozzle, its diameter of section of effectively spraying is often greater than 2m, can not meets and allow whole flow fields from beam emissions, the middle requirement of passing of receiving end.And the parameters such as the beam intensity of this type instrument and light beam hole diameter have also limited the measurement to larger particles drop.
Patent CN201110106477.4 discloses a kind of detection method distributing by gathering vibration measurement atomization of liquid particle diameter.Perpendicular to atomized drop injection direction place, one solid baffle is being set, at baffle plate back side region division vibration signal receiving trap.By vibration signal being carried out to wavelet decomposition, obtain the energy distribution rate in each characteristic frequency, thereby obtain corresponding particle diameter, distribute.This method is comparatively loaded down with trivial details, and its operability is poor.Because before actual measurement, first need to gather the vibration signal that different-grain diameter impingement baffles produces, set up the corresponding relation between mist droplet particle size and the segmentation of vibration signal different frequency.This precondition may realize hardly.In addition, this measuring method is not considered droplet rate vibration signal frequency and the error that produces.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of large-scale spray field atomization droplets diameter measurement mechanism is provided, this measurement device is convenient, for low pressure drop, large flow fog-spray nozzle, can describe its flow field size droplet diameter completely distributes, and when measuring size droplet diameter, can not produce larger error.
The object of the invention is to solve by the following technical programs:
This large-scale spray field atomization droplets diameter measurement mechanism, comprises measuring chamber, background board and supplementary light source; Described measuring chamber is surrounded by both sides side plate and top board, and its rear and front end is opened wide, and measuring chamber is divided into instrument room and jet chamber's two parts by central dividing plate, and instrument room is used for surveying instrument is set; Jet chamber and background board surround hemi-closure space, and tested drop particle and other atomizing particle is isolated; Supplementary light source is placed in after background board, on background board, offers window with measured zone correspondence position, to supplement source light, through this window, tested region drop is carried out to light filling; The scale strip that has imaging focusing and consult and use as size at the measured region division of drop, scale strip is fixed on light filling window both sides by draw point.
Above-mentioned central dividing plate is made by light material, stops that jet chamber's atomizing particle enters instrument room; The instrument sight line of taking pictures on described central dividing plate is provided with openable photography sight line window by region.
The top board of above-mentioned measuring chamber is comprised of horizontally disposed and the two parts that are in tilted layout, and wherein instrument room's top board is arranged horizontally, and jet chamber's top board, for being in tilted layout, lays sponge porous fibrous material on top board; The horizontally disposed part end of described top board is provided with manger board, and spraying liquid on top board is derived from measuring chamber both sides.
Above-mentioned background plate is that light-proof material is made, surround hemi-closure space with jet chamber, between its top and jet chamber's top board front end, leave gap, tested drop enters jet chamber from this gap, and background board is positioned under fog-spray nozzle and tip section is made machining laterally; On background board, part corresponding with measured zone offered window, so that the supplementary light after background board can be through this window to tested drop light filling; Described background board and light filling window Shang, jet chamber one side laying transmittance thereof are moderate and can make supplementary soft, the uniform background cloth of light.
Above-mentioned scale strip is transparent material, by one end of two draw points, is fixed in measured zone, and the other end of draw point is fixed on background board window both sides; Under the prerequisite of stable fixedly scale strip, draw point cross-sectional area should be as far as possible little; Distance between described scale strip and background board can regulate.
Above-mentioned supplementary light source power is determined by experimental enviroment, the instrument of taking pictures; Supplementary light source is sealed in transparent organic glass box, and is placed in spray area and to its box wall, carries out cooling by spraying granule; The aperture of power supply source line and exhaust use is left in the box bottom side of organic glass box.
The present invention has following beneficial effect:
(1) the present invention can describe flow field particle diameter distribution completely to low pressure drop, large flow fog-spray nozzle, and when measuring size droplet diameter, measures accurately, can not produce larger error.
(2) apparatus of the present invention can enter inside, flow field, only retain test solution and drop in not disturbed situation and enter measured zone, and can not limit the measurement to larger particles drop.
(3) measurement device mode of the present invention is succinctly convenient, and operability is good.
(4) shape when device of the present invention obtains drop flight, measurement result is not affected by liquid drop speed etc., measures more accurate.
Accompanying drawing explanation
Fig. 1 atomizing particle measurement mechanism schematic diagram;
Fig. 2 atomizing particle measurement mechanism front elevation, shooting form cover plate partly opens and does not comprise shooting instrument;
Fig. 3 atomizing particle measurement mechanism drop entrance is arranged schematic diagram;
Front elevation is arranged in Fig. 4 atomizing particle grain diameter measurement region;
Fig. 5 atomizing particle grain diameter measurement region rear view;
Fig. 6 atomizing particle grain diameter measurement result design sketch;
Wherein: 1, fog-spray nozzle; 2, jet chamber; 3, dividing plate; 4, photography sight line window; 5, removable cover; 6, top board; 7, sponge porous fibrous material; 8, manger board; 9, background board; 10, light filling window; 11, background cloth; 12, scale strip; 13, draw point; 14, light source; 15, organic glass box; 16, pedestal; 17, top board end face; 18, background board end face; 19, top board forward position; 20,21 is sidewall paneling; .
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Referring to Fig. 1 and Fig. 2: large-scale spray field atomization droplets diameter measurement mechanism of the present invention comprises measuring chamber, background board 9 and supplementary light source 14 and other auxiliary equipment, wherein measuring chamber by both sides side plate 20 and 21 and top board 6 surround, its rear and front end is opened wide, and measuring chamber is divided into a of instrument room and the b of jet chamber by central dividing plate 3.The a of instrument room shields to instrument 2 visual plants such as grade of taking pictures, and reduces droplet and adhere to speed when avoiding droplet to corrode equipment on picture taking lens, guarantees image quality.On dividing plate 3, offer photography sight line window 4, can make the Sight Accessibility of instrument 2 pass, arrive measured zone c.On photography sight line window 4, establish removable cover 5, when instrument is worked, cover plate 5 is opened and is taken pictures.In section, can close cover plate 5 At All Other Times, to reduce the amount of droplets that enters a of instrument room as far as possible.
Background board 9 and the b of jet chamber have surrounded hemi-closure space, and the atomizing particle that falls into measured zone c is separated with other atomization region particle.Background board 9 is made by lighttight vertical thin.Between background board 9 upper ends and jet chamber, leave gap.Tested particle falls into the measured zone c of the b of jet chamber from this gap.Referring to measurement mechanism entrance in Fig. 3, arrange schematic diagram, background board 9 is positioned under fog-spray nozzle 1, and its top is concordant with 2 tops, jet chamber.In order to avoid as far as possible the device of invading spray field that the forming process of tested drop is produced and disturbed, as shown in top board end face 17, background board end face 18 in Fig. 3, respectively top board 6 and background board 9 end faces are cut, top board top sponge porous fibrous material 7 is arranged as shown in Figure 3 simultaneously, made can from device portal gap, not fall into the drop of top board forward position 19 collision divisions.
On the top board 6 of a of instrument room and the b of jet chamber, lay sponge porous fibrous material 7, to reduce the atomizing particle causing because of the measurement of intrusion spray field as far as possible, again divide.At top board 6 ends, manger board 8 is set, spray fluid on top board 6 is derived from measuring chamber both sides.
Referring to Fig. 4, scale strip 12 is set in measured zone c, as with reference to size simultaneously to focus while taking drop.Scale strip 12 is transparent material, by one end of two fine steel needles 13, is fixed in measured zone c, and the other end of draw point 13 is fixed on background board 9.In order to reduce to invade the error that bring measurement zone, draw point 13 is under the prerequisite of satisfied fixedly scale strip 12, and cross-sectional area must be as much as possible little.Referring to Fig. 5, on background board 9 with measurement zone c over against position offer light filling window 10 so that supplement light source 14 by this window to tested particle light filling.On background board 9, tested particle one side covers background cloth 11.Comprehensively referring to Figure 4 and 5, in measured zone, after penetrating background cloth 11, the draw point 13 that is used for fixing scale strip 12 is fixed on the background board 9 of light filling window both sides Shang Xia 10.Background cloth 11 on window 10 light filling that can make to photograph is soft, even, and on background board 9, background cloth 11 can avoid making spraying granule directly directly to contact with background board 9 generations of rigid material simultaneously.
Supplementing light source 14 is sealed in transparent organic glass box 15.Spray field drop, simultaneously to 15 cooling effects of organic glass box, avoids supplementing the wall that light source 14 gives out heat burn through 15.Adjust pedestal 16 height and and background board 9 between distance, to obtain the best achievement in cinematography picture.Shooting results design sketch as shown in Figure 6.

Claims (5)

1. a large-scale spray field atomization droplets diameter measurement mechanism, is characterized in that, comprises measuring chamber, background board (9) and supplementary light source (14); Described measuring chamber is surrounded by both sides side plate (20,21) and top board (6), and its rear and front end is opened wide, and measuring chamber is divided into instrument room (a) and jet chamber (b) two parts by central dividing plate (3), and instrument room (a) used for surveying instrument is set; Jet chamber (b) surrounds hemi-closure space with background board (9), and tested drop particle and other atomizing particle is isolated; Supplement light source (14) and be placed in after background board (9), offer light filling window (10) with measured zone correspondence position background board (9) is upper, to supplement light source (14) light, pass this window tested region drop is carried out to light filling; The scale strip (12) that has imaging focusing and consult and use as size at the measured region division of drop, scale strip (12) is fixed on light filling window (10) both sides by draw point (13); The top board of described measuring chamber (6) is comprised of horizontally disposed and the two parts that are in tilted layout, and wherein instrument room (a) top board is arranged horizontally, and jet chamber (b) top board, for being in tilted layout, lays sponge porous fibrous material (7) on top board (6); The horizontally disposed part end of described top board (6) is provided with manger board (8), and the upper spraying liquid of top board (6) is derived from measuring chamber both sides.
2. large-scale spray field atomization droplets diameter measurement mechanism according to claim 1, is characterized in that, described central dividing plate (3) is made by light material, stops that jet chamber's atomizing particle enters instrument room; The instrument sight line of taking pictures on described central dividing plate (3) is provided with openable photography sight line window (4) by region.
3. large-scale spray field atomization droplets diameter measurement mechanism according to claim 1, it is characterized in that, described background board (9) is made for light-proof material, surround hemi-closure space with jet chamber (b), between its top and jet chamber's top board front end, leave gap, tested drop enters jet chamber (b) from this gap, background board (9) is positioned under fog-spray nozzle (1) and tip section is made machining laterally; Described background board (9) and light filling window (10) Shang, jet chamber (2) one sides laying transmittances thereof are moderate and can make supplementary soft, the uniform background cloth of light (11).
4. large-scale spray field atomization droplets diameter measurement mechanism according to claim 1, it is characterized in that, described scale strip (12) is transparent material, one end by two draw points (13) is fixed in measured zone, and the other end of draw point (13) is fixed on light filling window (10) both sides of background board (9); Under the prerequisite of stable fixedly scale strip (12), draw point (13) cross-sectional area should be as far as possible little; Distance between described scale strip (12) and background board (9) can regulate.
5. large-scale spray field atomization droplets diameter measurement mechanism according to claim 1, is characterized in that, described supplementary light source (14) power is determined by experimental enviroment, the instrument of taking pictures; Supplement light source (14) and be sealed in transparent organic glass box (15), and be placed in and by spraying granule, to its box wall, carry out cooling in spray area; The aperture of power supply source line and exhaust use is left in the box bottom side of organic glass box (15).
CN201210128574.8A 2012-04-27 2012-04-27 Device for measuring grain size of atomized droplet in large-size mist spray field Expired - Fee Related CN102636420B (en)

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CN103728231A (en) * 2014-01-15 2014-04-16 江苏中烟工业有限责任公司 Detection method for particle sizes of atomized droplets of feed liquid
CN104154871A (en) * 2014-08-27 2014-11-19 厦门大学 Diameter measuring method for mono-disperse micro-droplets
CN104165829A (en) * 2014-08-27 2014-11-26 厦门大学 Monodisperse microdroplet diameter measuring device and monodisperse microdroplet diameter measuring method
CN105300851B (en) * 2015-11-11 2017-08-25 中国农业大学 A kind of detection method of the spraying droplet three-dimensional spatial distribution based on laser technology
CN107664729B (en) * 2017-10-27 2024-04-19 佛山科学技术学院 Atomizer detects machine
CN108776100B (en) * 2018-06-19 2020-11-24 西南科技大学城市学院 Automatic material particle measuring mechanism
CN110006906B (en) * 2019-02-20 2021-12-17 上海鋆雪自动化有限公司 Fine atomization nozzle detection device and control method thereof
CN111855511A (en) * 2020-08-21 2020-10-30 山东建筑大学 Portable fogdrop particle size tester
CN113188961B (en) * 2021-03-30 2024-09-13 湘潭市计量测试检定所 Detection method for equivalent volume particle size distribution of fog particles of medical compression atomizer
CN113933218B (en) * 2021-09-26 2022-08-05 西安交通大学 Equipment for measuring local atomization granularity of large-scale spray field by matching with laser particle sizer
CN117147392A (en) * 2023-07-19 2023-12-01 中核四0四有限公司 Device and method for determining gas-liquid ratio value of atomized fluid

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