CN103969037A - Splash-proof device for atomization mechanism research and test platform - Google Patents

Abstract

The invention relates to a splash-proof device for an atomization mechanism research and test platform. The splash-proof device comprises sidewalls, a primary shutter structure, and a secondary shutter structure. The sidewalls are used for fixing and supporting the shutter structures. The bottom of each sidewall is provided with a rectangular notch. The primary shutter structure is composed of a plurality of parallel blades which are obliquely arranged between the sidewalls; the top ends of the blades are level with the top ends of the sidewalls; two ends of the blades are fixedly connected with the sidewalls; the A-A section of each blade is parallelogram shaped; the acute angle of the blades is equal to the slant angle of the blades; the ends of the adjacent blades are in the same vertical plane. The secondary shutter structure is composed of a plurality of parallel blades which are obliquely arranged between the sidewalls; the top ends of the blades are arranged right blow the blades of the primary shutter structure; two ends of the blades are fixedly connected with the sidewalls; the A-A section of each blade is parallelogram shaped; the acute angle is equal to the slant angle of the blades. The splash-proof device has the advantages that water splashing is prevented effectively and elimination of water mist during test is further enhanced.

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 splash proof device for atomization mechanism development test platform.

Background technology

Nozzle atomization performance quality directly affects the burning efficiency of the burners such as rocket engine, air heater and then affects its performance.Liquid or two-phase flow medium spray from nozzle, general experience continuous liquid film stage, primary fragmentation stage and the second-time breakage stage, for each stage of nozzle atomization, researcher studied in great detail both at home and abroad, but the common recognition of not reaching an agreement yet in the mechanism problem of atomization.

The people such as Lee of University of Science and Technology for National Defence is honest and upright, Wu Liyin design and build atomization mechanism development test platform, adopt the advanced optical instruments such as Phase Doppler analyser (PDA), laser particle size analyzer, high speed camera to study the conventional nozzle atomization performance of various rocket engines, be devoted to disclose the inherent law of nozzle atomization.

Wu Liyin has applied for " atomization mechanism development test platform " national patent in 2012, application number is 201210483054.9.As shown in Figure 2.Point out to have " fog curls up " problem in atomization research, affect flow field and observe and measure, the particularly use of optical device, invention makes to reduce as far as possible the impact of liquid mist on experimental measurement when carrying out nozzle atomization test by fog suction method.But in process of the test, when fluid flow larger, and while having gas assisted atomization, hydrofluidic is concentrated and speed is high, jet impulse rhone bottom, produce the strong phenomenon that dabbles, water droplet splashes and enter measured zone affects atomization measuring accuracy, thereby and the water droplet the splashing testing table spraying feeder that easily flies out affect testing laboratory's environment.

Summary of the invention

The technical matters that the present invention solves: the phenomenon that dabbles that atomization mechanism development test platform in use exists, and then affect atomization measuring accuracy.The invention provides a kind of anti-splash device for atomization mechanism development test platform.Effectively prevent from the dabbling generation of phenomenon, during simultaneously to test, the effect of further enhancing is played in the elimination of water smoke, improves atomization measuring accuracy.

A kind of anti-splash device for atomization mechanism development test platform of the present invention, comprises sidewall, one-level louver structure and secondary louver structure, and described sidewall is for fixing and support two-stage louver structure.Simultaneously the below of sidewall has rectangular recess; Described one-level louver structure is comprised of several parallel blades, and blade lean angle γ is positioned between two sidewalls, and blade tip is concordant with sidewall top, and blade two ends and two side are connected; The A-A cross sectional shape of blade is parallelogram, and wherein acute angle angle [alpha] equates with blade lean angle γ, and adjacent blades head and the tail are in same perpendicular.

Secondary louver structure is comprised of several parallel blades, and blade lean 2 γ angles are positioned between two sidewalls; Blade tip is positioned at the positive lower end of blade; Blade two ends and two side are connected; Blade A-A cross sectional shape is parallelogram, and wherein acute angle angle is identical with blade lean angle.

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

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

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

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

Cross section parallelogram inclined side length l, high h, acute angle angle [alpha], jet 1/2nd cone angle beta.

The technical solution adopted in the present invention is: the reason that water droplet splashes is mainly that liquid momentum is large, impacts in rhone bottom still on the undischarged water surface, causes that drop splashes.The present invention utilizes shutter that jet expansion hydrofluidic is not directly acted on the liquid level of rhone bottom, coordinates aspirator, the generation of the phenomenon that effectively prevents from dabbling.When hydrofluidic high-speed striking is on one-level louver structure, the drop of breakup of drop Cheng Geng little, direction of motion changes simultaneously, drop continues motion, or continue to impact and on one-level louver structure, continue broken and turn to, or then entering secondary louver structure by one-level louver structure, drop is in secondary louver structure or occur to clash into fragmentation and then enter rhone, or directly by secondary louver structure, enters rhone.Meanwhile, the liquid mist and the droplet that utilize aspirator head-on collision to hit formation aspirate, and prevent that liquid mist and droplet from moving upward.

Beneficial effect is:

1, the present invention has avoided the direct shock of liquid level in hydrofluidic and rhone, jet occurs broken and turns in the shock with one-level louver structure and secondary louver structure, while entering rhone, liquid momentum is weakened, thereby can not produce violent shock with liquid in rhone, produces the serious phenomenon that dabbles;

2, aspirator produces hydrofluidic in clashing into shattering process fine drop, liquid mist aspirate downwards, thereby liquid mist can not risen, affect the measurement of upstream test;

3, aspirator can also make larger drop to the mobile direction motion of suction airstream, to stoping drop upwards to splash and play a role in shattering process to a certain extent;

4, partially liq still can move upward because clashing into fragmentation and the backwash in rhone, but the gross mass of the liquid that this part moves upward and momentum are all little than not adding before splash proof device, and stopping due to two-stage louver structure, the drop that is really splashed into upstream and affects measurement result seldom, in practical application, find, this part drop does not almost have.

Accompanying drawing explanation

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

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

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

Fig. 4: splash proof device structural drawing of the present invention

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

Fig. 5 a: Fig. 3 A-A cut-open view

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

Embodiment

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

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

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

One-level louver structure 22 is comprised of several parallel blades 221, and blade 221 angle of inclination γ are positioned between two sidewalls 21, and blade 221 tops are concordant with sidewall 21 tops, and blade 221 two ends and two side 21 are connected.The A-A cross sectional shape of blade 221 is parallelogram, and wherein acute angle angle [alpha] equates with blade 221 angle of inclination γ, thereby after blade 221 and sidewall 21 are connected, tetragonal one side, cross section keeps vertically.Adjacent blades 221 head and the tail are in same perpendicular, as BC and DE conllinear.

Blade 221 sizes and pitch angle γ definite follows following principle: one, and the ratio range of the high h that its cross section parallelogram inclined side length l is corresponding with this limit is 30～40; Two, γYu cross section, its angle of inclination parallelogram acute angle angle [alpha] equates; Three, hydrofluidic and same blade 221 clash into number of times and are no more than once; Four, after hydrofluidic and blade 221 impact effects, can not continue to impinge upon in the vertical plane of adjacent blades 221 (DE); Five, the blockage ratio of one-level shutter mechanism $\mathrm{\λ}=\frac{2h}{l\·\sin \left(2\mathrm{\α}\right)}$ Be less than 0.2.

Concrete computation process is as follows:

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

Second step: determine blade lean angle α and cross section parallelogram acute angle angle.Suppose that jet is that jet 1/2nd cone angles impact on blade 221 with maximum inclination angle β, on principle two, principle three and principle four requirements, need to meet impact after the jet reflection on blade 221 tops, impact on adjacent blades 221 dip plane and again after secondary reflection directly by one-level louver structure.Meet following two criterions simultaneously:

Criterion one: $\frac{l\·\sin \mathrm{\α}-h/\cos \mathrm{\α}}{\tan (2\mathrm{\α}+\mathrm{\β})-\tan \mathrm{\α}}-\frac{h}{\sin \mathrm{\α}}>0$

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

For example: get h=3mml=90mml/h=30, jet 1/2nd cone angle beta=5 °, obtain blade 221 γ=10 °, angle of inclination, its parallelogram acute angle angle [alpha]=10 °, cross section, horizontal range d=15.6mm between adjacent blades 221, one-level louver structure blockage ratio λ=0.195.The one-level louver structure obtaining meets design requirement.

Secondary louver structure 23 is comprised of several parallel blades 231, and blade 231 inclination 2 γ angles are positioned between two sidewalls 21; Blade 231 tops are positioned at the positive lower end of blade 221; Blade 231 two ends and two side 21 are connected; Blade 231A-A cross sectional shape is parallelogram, and wherein acute angle angle is identical with blade 231 angles of inclination, thereby after blade 231 and sidewall 21 are connected, tetragonal one side, cross section keeps vertically.Adjacent blades 231 head and the tail are in same perpendicular.

Following principle is followed at blade 231 sizes and pitch angle: one, and its angle of inclination is the twice at blade 221 angles of inclination; Two, its angle of inclination equates with cross section parallelogram acute angle angle; Three, adjacent blades 231 level intervals are the twice of blade 221 level intervals, and blade 231 is always positioned under blade 221; Four, the ratio range of the high h that blade 231 cross section parallelogram inclined side length l are corresponding with this limit is 30-40.

For example: blade 231 tops are positioned at blade 221 50mm places, lower end, its cross section parallelogram acute angle angle is 20 degree, its angle of inclination is 20 degree, inclined side length is 91.4mm, the height that inclined side is corresponding is 3mm, horizontal range between adjacent blades 231 is 31.2mm, and secondary louver structure blockage ratio is 0.102.

Splash proof device 2 is placed in rectangle liquid mist feeder 1, and the downward-sloping direction of louver structure is placed in to exhaust duct 11 1 sides,

Louver structure multiple impacts in hydrofluidic and the present invention, tiny liquid mist is from the air-breathing discharge of exhaust duct 11.Another part liquid converges to water leg by two-stage louver structure.

Although described by reference to the accompanying drawings embodiments of the present invention, those of ordinary skills can make various distortion or modification within the scope of the appended claims.

Claims (3)

1. for an anti-splash device for atomization mechanism development test platform, comprise sidewall (21), one-level louver structure (22) and secondary louver structure (23);

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

Described one-level louver structure (22) is comprised of several parallel blades (221), blade (221) angle of inclination γ is positioned between two sidewalls (21), blade (221) top is concordant with sidewall (21) top, and blade (221) two ends and two side (21) are connected; The A-A cross sectional shape of blade (221) is parallelogram, and the acute angle angle [alpha] of parallelogram equates with blade (221) angle of inclination γ, and adjacent blades (221) head and the tail are in same perpendicular;

Described secondary louver structure (23) is comprised of several parallel blades (231), and blade (231) inclination 2 γ angles are positioned between two sidewalls (21); Blade (231) top is positioned at the positive lower end of blade (221); Blade (231) two ends and two side (21) are connected; Blade (231) A-A cross sectional shape is parallelogram, and wherein acute angle angle is identical with blade (231) angle of inclination.

2. a kind of anti-splash device for atomization mechanism development test platform as claimed in claim 1, is characterized in that the ratio range of the high h that described blade (231,221) cross section parallelogram inclined side length l is corresponding with this limit is 30～40.

3. a kind of anti-splash device for atomization mechanism development test platform as claimed in claim 1, is characterized in that the size of described blade (221,231) meets the requirement of formula 1,2 simultaneously:

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

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

Cross section parallelogram inclined side length l, high h, acute angle angle [alpha], jet 1/2nd cone angle beta.