CN103969037B - A kind of anti-splash device for atomization mechanism development test platform - Google Patents

Abstract

A kind of anti-splash device for atomization mechanism development test platform of the present invention, including sidewall, one-level louver structure and two grades of louver structures, sidewall is used for fixing and support two-stage louver structure.The bottom of sidewall has rectangular recess simultaneously；One-level louver structure is made up of several parallel blades, and blade pitch angle is positioned between two sidewalls, and blade tip is concordant with sidewall top, and blade two ends are connected with two side；The A A cross sectional shape of blade is parallelogram, and wherein sharp angle is equal with blade pitch angle, and adjacent blades head and the tail are in same perpendicular, and two grades of louver structures are made up of several parallel blades, and blade pitch angle is positioned between two sidewalls；Blade tip is positioned at the positive lower end of blade；Blade two ends are connected with two side；Blade A A cross sectional shape is parallelogram, and sharp angle is identical with blade pitch angle.The present invention effectively prevents from dabbling the generation of phenomenon, the elimination of water smoke during test is played the effect further enhanced simultaneously.

Description

A kind of anti-splash device for atomization mechanism development test platform

Technical field

The present invention relates to rocket engine technical field, particularly relate to a kind of for atomization mechanism development test platform Splash proof device.

Background technology

Nozzle atomization performance quality directly affect the burner such as rocket engine, air heater efficiency of combustion and then Affect its performance.Liquid or two phase flow medium spray from nozzle, general experience continuous liquid film stage, primary fragmentation stage and secondary Crushing stage, for each stage of nozzle atomization, domestic and international researcher all carried out research in detail, but in the mechanism of atomization Do not reach an agreement yet in problem common recognition.

University of Science and Technology for National Defence Lee is honest and upright, Wu Liyin et al. design build atomization mechanism development test platform, uses phase place how general Strangle the advanced optical instrument such as analyser (PDA), laser particle size analyzer, high speed camera and various rocket engines are commonly used nozzle mist Change performance to study, be devoted to disclose the inherent law of nozzle atomization.

Wu Liyin applied for " atomization mechanism development test platform " national patent, Application No. in 2012 201210483054.9.As shown in Figure 2.Point out atomization research exists " fog curls up " problem, affect flow field and observe and measure, The particularly use of optical device, invents and makes to reduce liquid mist as far as possible when carrying out nozzle atomization test by fog suction method The impact that test is measured.But in process of the test, when fluid flow is relatively big, and when having gas assisted atomization, liquid jet Concentrating and speed is high, bottom jet impulse rhone, produce the strong phenomenon that dabbles, water droplet splashes and enters measured zone impact Atomization certainty of measurement, and the water droplet splash easily fly out testing stand spraying collecting tank thus affect test chamber environment.

Summary of the invention

Present invention solves the technical problem that: the phenomenon that dabbles that atomization mechanism development test platform in use exists, And then impact atomization certainty of measurement.The invention provides a kind of anti-splash device for atomization mechanism development test platform.Effectively Prevent from dabbling the generation of phenomenon, the elimination of water smoke during test is played the effect further enhanced simultaneously, improves atomization and measure essence Degree.

A kind of anti-splash device for atomization mechanism development test platform of the present invention, including sidewall, one-level louver structure and Two grades of louver structures, described sidewall is used for fixing and support two-stage louver structure.The bottom of sidewall has rectangular recess simultaneously； Described one-level louver structure is made up of several parallel blades I, and blade I angle of inclination γ is positioned between two sidewalls, blade I Top is concordant with sidewall top, and blade I two ends are connected with two side；The Section A-A of blade I is shaped as parallelogram, wherein Sharp angle α and blade I angle of inclination γ is equal, and adjacent blades I head and the tail are in same perpendicular.

Two grades of louver structures are made up of several parallel blades II, blade II tilt 2 γ angles be positioned over two sidewalls it Between；Blade II top is positioned at the positive lower end of blade I；Blade II two ends are connected with two side；Blade IIA-A cross sectional shape is parallel four Limit shape, wherein sharp angle is identical with blade II angle of inclination.

Preferably, the ratio range of the high h that described blade profile parallelogram inclined side length l is corresponding with this limit is 30-40。

The size of blade meets the requirement of formula 1,2 simultaneously:

$\frac{l\·sin\mathrm{\α}-h/cos\mathrm{\α}}{tan(2\mathrm{\α}+\mathrm{\β})-tan\mathrm{\α}}-\frac{h}{sin\mathrm{\α}}>0---\left(1\right)$

$\frac{l\·{\sin }^2\mathrm{\α}-tan(2\mathrm{\α}+\mathrm{\β})\·h}{\left(\tan \right(2\mathrm{\α}+\mathrm{\β})-\tan \mathrm{\α})\·cos\mathrm{\α}}-(l\·cos\mathrm{\α}+\frac{h}{sin\mathrm{\α}}-\frac{l\·sin\mathrm{\α}-h/cos\mathrm{\α}}{tan(2\mathrm{\α}+\mathrm{\β})-tan\mathrm{\α}})\·tan\mathrm{\β}>0---\left(2\right)$

Cross section parallelogram inclined side length l, high h, sharp angle α, jet 1/2nd cone angle beta.

The technical solution adopted in the present invention is: it is big that the reason that water droplet splashes is mainly liquid momentum, and impact is at rhone On the most undischarged water surface in bottom, cause fluid spills.The present invention utilizes shutter to make jet expansion liquid jet the most straight Connect and act on bottom rhone on liquid level, coordinate aspirator, the generation of the phenomenon that effectively prevents from dabbling.When liquid jet hits at a high speed Beating on one-level louver structure, the drop of breakup of drop Cheng Geng little, the direction of motion changes simultaneously, and drop continues motion, or Continue impact continue broken on one-level louver structure and turn to, or tied subsequently into two grades of BAIYE by one-level louver structure Structure, drop is in two grades of louver structures or occurs shock broken subsequently into rhone, or is directly entered by two grades of louver structures Enter rhone.Meanwhile, utilize aspirator head-on collision to hit the liquid mist of formation and droplet aspirates, prevent liquid mist and droplet Move upward.

Provide the benefit that:

1, present invention, avoiding the direct shock of liquid level in liquid jet and rhone, jet with one-level louver structure and Occurring broken in the shock of two grades of louver structures and turn to, when entering rhone, liquid momentum is weakened, will not with in rhone Liquid produces hard hit thus produces the serious phenomenon that dabbles；

2, fine drop, the liquid mist that liquid jet is produced in clashing into shattering process by aspirator is aspirated downwards so that Liquid mist will not rise thus affect the measurement of upstream test；

3, aspirator can also make bigger drop move to the direction that suction airstream flows, to resistance to a certain extent Only drop splashes up in shattering process and plays a role；

4, partially liq still can move upward because clashing into broken and backwash in rhone, but this part to The gross mass of the liquid of upper motion and momentum are all less than before not adding splash proof device, and due to the stop of two-stage louver structure, Really be splashed into upstream and to affect the drop of measurement result little, actual application finds, this partial drop almost without.

Accompanying drawing explanation

Fig. 1: splash proof device structure and working principle schematic diagram of the present invention

Fig. 2: the structural representation of the dispersion spray aspirating mechanism of prior art atomization mechanism development test platform.

Fig. 3: the splash proof device of the present invention scheme of installation in atomization mechanism development test platform

Fig. 4: splash proof device structure chart of the present invention

Fig. 5: one-level louver structure blade construction figure in the present invention

Fig. 5 a: Fig. 3 A-A sectional view

The enlarged drawing of M part in Fig. 5 b: Fig. 5 a

Detailed description of the invention

Below in conjunction with the accompanying drawings the present invention is described in detail.

Splash proof device of the present invention as shown in Figure 4, including sidewall 21, one-level louver structure 22 and two grades of louver structures 23.

Sidewall 21 is used for fixing and support two-stage louver structure, and the bottom of sidewall has rectangular recess, for draining.

One-level louver structure 22 is made up of several parallel blades I 221, and blade I 221 angle of inclination γ is positioned over two Between sidewall 21, blade I 221 top is concordant with sidewall 21 top, and blade I 221 two ends are connected with two side 21.Blade I The Section A-A of 221 is shaped as parallelogram, and wherein sharp angle α and blade I 221 angle of inclination γ is equal, so that leaf Sheet I 221 be connected with sidewall 21 after cross section tetragon while keeping vertically.Adjacent blades I 221 head and the tail are in same the most flat In face, such as BC Yu DE conllinear.

Following principle is followed in the determination of blade I 221 size and inclination angle γ: one, and its cross section parallelogram tilts length of side The ratio range of the high h that degree l is corresponding with this limit is 30～40；Two, its angle of inclination γ and cross section parallelogram sharp angle α Equal；Three, liquid jet and same blade I 221 clash into number of times less than once；Four, liquid jet clashes into blade I 221 The vertical plane that will not continue to impinge upon adjacent blades I 221 after reflection is interior (DE)；Five, the blockage ratio of one-level shutter mechanismLess than 0.2.

Concrete calculating process is as follows:

The first step: determine blade I 221 cross section parallelogram inclined side length l and corresponding high h；

Second step: determine blade pitch angle α and cross section parallelogram sharp angle.Assume that jet is with allowable angle of inclination Degree i.e. jet 1/2nd cone angle of β impacts on blade I 221, and two, principle three and principle four requirement, need to meet and hit on principle Impact in adjacent blades I 221 inclined plane after playing the reflection of the jet on blade I 221 top and directly pass through after secondary reflection again One-level louver structure.Meet following two criterion simultaneously:

Criterion one:

Criterion two:

Such as: take h=3mm l=90mm l/h=30, jet 1/2nd cone angle beta=5 °, blade I221 is obtained Angle γ=10 °, its parallelogram sharp angle α=10 °, cross section, horizontal range d=between adjacent blades I 221 15.6mm, one-level louver structure blockage ratio λ=0.195.The one-level louver structure obtained meets design requirement.

Two grades of louver structures 23 are made up of several parallel blades II231, and blade II231 tilts 2 γ angles and is positioned over two Between individual sidewall 21；Blade II231 top is positioned at the positive lower end of blade I 221；Blade II231 two ends are connected with two side 21；Leaf Sheet II231A-A cross sectional shape is parallelogram, and wherein sharp angle is identical with blade II231 angle of inclination, so that blade II231 and sidewall 21 be connected after cross section tetragon while keeping vertically.Adjacent blades II231 head and the tail are in same perpendicular In.

Following principle is followed at blade II231 size and inclination angle: one, and its angle of inclination is blade I 221 angle of inclination Twice；Two, its angle of inclination is equal with cross section parallelogram sharp angle；Three, adjacent blades II 231 level interval is leaf The twice of sheet I 221 level interval, and blade II231 is always located in immediately below blade I 221；Four, blade II231 cross section is parallel The ratio range of the high h that tetragon inclined side length l is corresponding with this limit is 30-40.

Such as: blade II 231 top is positioned at blade I 221 lower end 50mm, its cross section parallelogram sharp angle is 20 degree, its angle of inclination is 20 degree, a length of 91.4mm of inclined side, a height of 3mm that inclined side is corresponding, adjacent blades II231 it Between horizontal range be 31.2mm, two grades of louver structure blockage ratios are 0.102.

Splash proof device 2 is placed in rectangle liquid mist collecting tank 1, and louver structure downwardly-inclined direction is placed in exhaust duct 11 sides,

Liquid jet and louver structure multiple impacts in the present invention, tiny liquid mist is discharged from exhaust duct 11 air-breathing.Another Partially liq converges to water leg by two-stage louver structure.

Although being described in conjunction with the accompanying embodiments of the present invention, but those of ordinary skill in the art can be in appended power Profit makes various deformation or amendment in the range of requiring.

Claims (2)

1. for the anti-splash device of atomization mechanism development test platform, including sidewall (21), one-level louver structure (22) and Two grades of louver structures (23)；

Described sidewall (21) is used for fixing and support two-stage louver structure, and the bottom of sidewall has groove；

Described one-level louver structure (22) is made up of several parallel blades I (221), and blade I (221) angle of inclination γ is positioned over Between two sidewalls (21), blade I (221) top is concordant with sidewall (21) top, blade I (221) two ends and two side (21) It is connected；The Section A-A of blade I (221) is shaped as parallelogram, and the sharp angle α and blade I (221) of parallelogram incline Rake angle γ is equal, and adjacent blades I (221) head and the tail are in same perpendicular；

Described two grades of louver structures (23) are made up of several parallel blades II (231), and blade II (231) tilts 2 γ angles and puts It is placed between two sidewalls (21)；Blade II (231) top is positioned at the positive lower end of blade I (221)；Blade II (231) two ends and two Sidewall (21) is connected；Blade II (231) Section A-A is shaped as parallelogram, and wherein sharp angle tilts with blade II (231) Angle is identical；

Described blade I (221), the size of blade II (231) meet the requirement of formula 1,2 simultaneously:

$\frac{l\·sin\mathrm{\α}-h/cos\mathrm{\α}}{tan(2\mathrm{\α}+\mathrm{\β})-tan\mathrm{\α}}-\frac{h}{sin\mathrm{\α}}>0---\left(1\right)$

$\frac{l\·{\sin }^2\mathrm{\α}-tan(2\mathrm{\α}+\mathrm{\β})\·h}{\left(\tan \right(2\mathrm{\α}+\mathrm{\β})-\tan \mathrm{\α})\·cos\mathrm{\α}}-(l\·cos\mathrm{\α}+\frac{h}{sin\mathrm{\α}}-\frac{l\·sin\mathrm{\α}-h/cos\mathrm{\α}}{tan(2\mathrm{\α}+\mathrm{\β})-tan\mathrm{\α}})\·tan\mathrm{\β}>0---\left(2\right)$

Cross section parallelogram inclined side length l, high h, sharp angle α, jet 1/2nd cone angle beta.

A kind of anti-splash device for atomization mechanism development test platform, it is characterised in that described The ratio range of the high h that blade (231,221) cross section parallelogram inclined side length l is corresponding with this limit is 30～40.