CN1603772A

CN1603772A - RT and RM instability generation device for fluid interface

Info

Publication number: CN1603772A
Application number: CN 200410090861
Authority: CN
Inventors: 施红辉
Original assignee: Institute of Mechanics of CAS
Current assignee: Institute of Mechanics of CAS
Priority date: 2004-11-16
Filing date: 2004-11-16
Publication date: 2005-04-06
Anticipated expiration: 2024-11-16
Also published as: CN100362330C

Abstract

This invention discloses a fluid interface RT and RM instability generating apparatus, which comprises pipes. The said pipes comprises gas section and test section which are sealed and connected with each other, wherein, the gas section is sealed on top and the test section is located with a separate film on bottom. The above structure can conveniently realize the instability experiments of RT and RM in fluid interface.

Description

Fluid interface RT and RM instability generating means

Technical field

The present invention relates to a kind of fluid interface instability generating means, belong to the fluid mechanics research field.

Background technology

When the interface of being made up of the different fluid of two-layer density is quickened suddenly, this interface can produce scratches and instability, research to this phenomenon not only has wide industrial application values, and on On Basic Research of Fluid Mechanics important academic values is arranged also.This instability is called as Rayleigh-Taylor (RT) instability, and for example, the water surface of ocean is unstability under action of gravity.When this interface was quickened by a shock wave, the instability of this moment was called as Richtmyer-Meshkov (RM) instability, for example, and inertial confinement fusion (ICF).During research ICF, the RM instability process in the time of must knowing shock wave by the interface between high flexible linear-shaped charge and the nuclear fuel.Present popular way is to carry out numerical simulation with supercomputer.Yet, how to verify that these calculation procedures are the problems that must solve.Adopt the mode of high flexible linear-shaped charge blast, not only test costlyly, and be difficult to collect the data that will write down in the blast process.Carry out RT and RM experiment with gas/water termination, can realize density than being instability interface about 1000 times, can be to a certain extent than near the interface conditions among the ICF.Yet, the present device that above-mentioned simulated experiment also do not occur realizing preferably.

Summary of the invention

The objective of the invention is at above-mentioned present situation, provide a kind of compact conformation, easy to use, can make fluid interface RT and RM instability generating means that fluid column moment quickens.

For achieving the above object, technical scheme of the present invention is as follows:

A kind of fluid interface RT and RM instability generating means, it is characterized in that: this device is made up of body, and described body comprises gas section and experimental section, and this gas section and experimental section are tightly connected, wherein gas section upper end sealing, the experimental section lower end is provided with a barrier film.

Further, described experimental section lower end is sealedly connected with discharge section, this discharge section lower end sealing.

Further, the two ends of described experimental section are tightly connected by flange and described gas section and discharge section respectively.

Further, place a thin plate on the described barrier film, the shape of this thin plate is identical with the cross sectional shape of described experimental section, and its size is slightly less than the cross section of this experimental section inwall.

Further, described gas section is divided into two sections, connects by flange seal between the two sections.

Further, the joint flange place between the described gas section two sections is provided with a barrier film, by this barrier film described gas section is divided into hyperbaric chamber and low-pressure chamber.

Further, described device also comprises support, and described body is fixed on this support.

Further, described support upper end is provided with a panel, and panel is provided with and the identical hole of cross sectional shape, described hyperbaric chamber, and upper end, described hyperbaric chamber has external thread and stretch out in the hole passed on the described panel, and pad and setting nut are nested with on it.

Further, described support is provided with hinge, and described experimental section is movably hinged on this support by this hinge.

Further, on described experimental section, be provided with view window.

Further, described low-pressure chamber and experimental section cross sectional shape are square.

Further, on the sidewall of described hyperbaric chamber gas admittance valve and tensimeter are installed.

After adopting said structure, because instability generating means of the present invention comprises support, gas section, experimental section, connected by flange seal between each section, easy for installation, compact conformation can be realized simulated experiment easily; On the other hand,, can directly be communicated with between two sections or be divided into two Room, therefore, can easily realize the RT of fluid interface, the instability simulated experiment of RM dual mode quickly by barrier film because two sections of being connected by flange of gas section form.In addition, because discharge section is closed container, the noise that produces in the time of more can reducing fluid column and fall to discharging at a high speed.And the hinge that the setting nut of hyperbaric chamber upper end is connected with the experimental section side is convenient laborsaving when this device is installed and used.Low-pressure chamber is selected different shapes with experimental section, can realize fluid interface RT and the simulated experiment of RM instability that cross sectional shape is different.

Description of drawings

Fig. 1 is a structural drawing of the present invention;

Fig. 2 is the vertical view of panel of the present invention.

Embodiment:

Further specify the present invention below in conjunction with accompanying drawing.

As shown in Figure 1, the present invention is made up of support 1 and body, and described body comprises gas section 2, experimental section 3, discharge section 4 three parts.

Support 1 is for having the metal frame of certain rigidity, and its upper end is provided with a panel 11, and as shown in Figure 2, panel is provided with hole 12, and the shape in hole 12 is identical with the cross sectional shape of described gas section 2, and this support middle and lower part is provided with hinge 13.

Gas section 2 is divided into two sections, epimere is that hyperbaric chamber 21, hypomere are low-pressure chamber 22, hyperbaric chamber 21 is circular closed tube for inner chamber, the upper end has external thread and passes above-mentioned hole 12 and stretch out, pad 14 is nested with on it and with panel 11 and fixes, and then setting nut 24 is nested with on it, by the upper and lower displacement in setting nut 24 scalable hyperbaric chambers 21; Low-pressure chamber 22 is square body for the cross section, be connected and sealed by flange 211,221 between hyperbaric chamber and the low-pressure chamber, placing a barrier film 23 by seal with O ring between this two flange separates two Room up and down, this barrier film 23 is the aluminium foil or the polyethylene film of energy bearing certain pressure, and its thickness is decided on the pressure in hyperbaric chamber 21; Rotation setting nut 24, can make on the hyperbaric chamber 21 and move, between two flanges 211,221, pack into barrier film 23 and O-ring seal, hyperbaric chamber 21 is moved down, and two flanges are fixed by screw, or do not put into barrier film according to circumstances and directly two flanges are screwed, hyperbaric chamber 21 is communicated with low-pressure chamber 22.Also be separately installed with gas admittance valve 25 and tensimeter 26 on the sidewall in hyperbaric chamber 21, can connect different types of gases at high pressure by gas admittance valve 25.

Experimental section 3 is square body for the cross section, its upper end is tightly connected by two flanges 31,222 and the gas section 2 that is screwed, the lower end also connects discharge section 4 by two flanges that are screwed, pass through seal with O ring one barrier film 6 between this two flange, this barrier film 6 is the aluminium foil or the polyethylene film of energy bearing certain pressure, place a thin plate 7 on the barrier film 6, the shape of thin plate 7 is identical with the cross sectional shape of experimental section 3, its size is slightly less than the cross section of experimental section 3 inwalls, under pressure, can there be frictionally downslide along the inwall of experimental section 3.Experimental section 3 one sides are movably hinged on support 1 by hinge 13, make experimental section 3 to rotate around hinge 13, in addition, are provided with view window 32 at arbitrary side of experimental section 3.Unload the screw of mounting flange 31,222, this two flange is unclamped relatively, experimental section 3 is turned an angle around hinge 13, stagger with low-pressure chamber 22 in vertical direction, can put into thin plate 7 and the used liquid of injection experiments from the upper port of experimental section 3, and then it is with experimental section 3 rotation playback, and two flanges 31,221 are fixing.

Discharge section 4 can be one and opens wide body, yet, when falling at a high speed, the fluid column of large volume can produce huge noise, and for reducing noise, this body is set to the airtight body in lower end.

Scratching of producing when the different fluid column of cross sectional shape falls at a high speed is different, and for satisfying the research needs under the different situations, above-mentioned low-pressure chamber 22 and experimental section 3 also can be made as the cross section and be circular or oval-shaped body.This analogue means can carry out the simulated experiment that 50 normal atmospheres are depressed, so the each part mentioned above body is made by the material that can bear greater than 50 standard atmospheric pressures.

In experimentation, open gas admittance valve 25, make gases at high pressure enter high pressure section 21, at this moment the gaseous tension in the low-pressure chamber 22 remains on 1 atmospheric pressure, when tensimeter 26 shows that pressure arrives setting value, valve-off.Under the gases at high pressure effect, barrier film 23 between hyperbaric chamber and the low-pressure chamber is crushed, gases at high pressure impact downwards, producing shock wave acts on the fluid column in the experimental section 3, being crushed fluid column at surge pressure effect lower diaphragm plate 6 by transient state falls at a high speed, on view window 32, place high-speed camera, take when fluid column falls at a high speed under the shock wave effect scratching that the fluid column surface is produced to study.Because of being placed with thin plate 7 on the barrier film 6, make fluid column bottom surface maintenance level in dropping process, more can satisfy the needs of simulated experiment.Fluid column, the barrier film that crushes and the thin plate that falls falls into discharge section 4 together at a high speed, and the simulated experiment of fluid interface RM instability generating process finishes.

If in above-mentioned experimentation, between flange 211,221, barrier film 23 is not set, even hyperbaric chamber 21 communicates with low-pressure chamber 22, open gas admittance valve 25, make gases at high pressure enter gas section 2, when tensimeter 26 shows that pressure arrives setting value, valve-off.The quasistatic gases at high pressure act on the fluid column in the experimental section 3, under ever-increasing gaseous tension effect, barrier film 6 is crushed fluid column suddenly and is fallen at a high speed, on view window 32, place high-speed camera, take scratching of being produced on the fluid column surface when fluid column falls at a high speed, can realize the simulated experiment of fluid interface RT instability generating process to study.

Claims

1, a kind of fluid interface RT and RM instability generating means, it is characterized in that: this device is made up of body, and described body comprises gas section and experimental section, and this gas section and experimental section are tightly connected, wherein gas section upper end sealing, the experimental section lower end is provided with a barrier film.

2, fluid interface RT as claimed in claim 1 and RM instability generating means, it is characterized in that: described experimental section lower end is sealedly connected with discharge section, this discharge section lower end sealing.

3, fluid interface RT as claimed in claim 1 or 2 and RM instability generating means is characterized in that: the two ends of described experimental section are tightly connected by flange and described gas section and discharge section respectively.

4, fluid interface RT as claimed in claim 3 and RM instability generating means is characterized in that: place a thin plate on the described barrier film, the shape of this thin plate is identical with the cross sectional shape of described experimental section, and its size is slightly less than the cross section of this experimental section inwall.

5, fluid interface RT as claimed in claim 4 and RM instability generating means, it is characterized in that: described gas section is divided into two sections, connects by flange seal between the two sections.

6, fluid interface RT as claimed in claim 5 and RM instability generating means is characterized in that: the joint flange place between the described gas section two sections is provided with a barrier film, by this barrier film described gas section is divided into hyperbaric chamber and low-pressure chamber.

7, fluid interface RT as claimed in claim 6 and RM instability generating means, it is characterized in that: described device also comprises support, described body is fixed on this support.

8, fluid interface RT as claimed in claim 7 and RM instability generating means, it is characterized in that: described support upper end is provided with a panel, panel is provided with and the identical hole of cross sectional shape, described hyperbaric chamber, stretch out in the hole that has external thread on the described hyperbaric chamber and pass on the described panel, and pad and setting nut are nested with on it.

9, fluid interface RT as claimed in claim 8 and RM instability generating means, it is characterized in that: described support is provided with hinge, and described experimental section is movably hinged on this support by this hinge.

10, fluid interface RT as claimed in claim 9 and RM instability generating means is characterized in that: be provided with view window on described experimental section.

11, fluid interface RT as claimed in claim 10 and RM instability generating means, it is characterized in that: described low-pressure chamber and experimental section cross sectional shape are square.

12, fluid interface RT as claimed in claim 11 and RM instability generating means is characterized in that: on the sidewall of described hyperbaric chamber gas admittance valve and tensimeter are installed.